| 1 | // <ranges> -*- C++ -*- |
|---|---|
| 2 | |
| 3 | // Copyright (C) 2019-2026 Free Software Foundation, Inc. |
| 4 | // |
| 5 | // This file is part of the GNU ISO C++ Library. This library is free |
| 6 | // software; you can redistribute it and/or modify it under the |
| 7 | // terms of the GNU General Public License as published by the |
| 8 | // Free Software Foundation; either version 3, or (at your option) |
| 9 | // any later version. |
| 10 | |
| 11 | // This library is distributed in the hope that it will be useful, |
| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | // GNU General Public License for more details. |
| 15 | |
| 16 | // Under Section 7 of GPL version 3, you are granted additional |
| 17 | // permissions described in the GCC Runtime Library Exception, version |
| 18 | // 3.1, as published by the Free Software Foundation. |
| 19 | |
| 20 | // You should have received a copy of the GNU General Public License and |
| 21 | // a copy of the GCC Runtime Library Exception along with this program; |
| 22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| 23 | // <http://www.gnu.org/licenses/>. |
| 24 | |
| 25 | /** @file include/ranges |
| 26 | * This is a Standard C++ Library header. |
| 27 | * @ingroup concepts |
| 28 | */ |
| 29 | |
| 30 | #ifndef _GLIBCXX_RANGES |
| 31 | #define _GLIBCXX_RANGES 1 |
| 32 | |
| 33 | #if __cplusplus > 201703L |
| 34 | |
| 35 | #ifdef _GLIBCXX_SYSHDR |
| 36 | #pragma GCC system_header |
| 37 | #endif |
| 38 | |
| 39 | #include <concepts> |
| 40 | |
| 41 | #if __cpp_lib_concepts |
| 42 | |
| 43 | #include <compare> |
| 44 | #include <initializer_list> |
| 45 | #include <iterator> |
| 46 | #include <optional> |
| 47 | #include <span> |
| 48 | #include <string_view> |
| 49 | #include <tuple> |
| 50 | #if __cplusplus > 202002L |
| 51 | #include <utility> |
| 52 | #include <variant> |
| 53 | #endif |
| 54 | #include <bits/binders.h> |
| 55 | #include <bits/ranges_util.h> |
| 56 | #include <bits/refwrap.h> |
| 57 | |
| 58 | #define __glibcxx_want_algorithm_default_value_type |
| 59 | #define __glibcxx_want_ranges |
| 60 | #define __glibcxx_want_ranges_as_const |
| 61 | #define __glibcxx_want_ranges_as_rvalue |
| 62 | #define __glibcxx_want_ranges_cache_latest |
| 63 | #define __glibcxx_want_ranges_cartesian_product |
| 64 | #define __glibcxx_want_ranges_concat |
| 65 | #define __glibcxx_want_ranges_chunk |
| 66 | #define __glibcxx_want_ranges_chunk_by |
| 67 | #define __glibcxx_want_ranges_enumerate |
| 68 | #define __glibcxx_want_ranges_filter |
| 69 | #define __glibcxx_want_ranges_indices |
| 70 | #define __glibcxx_want_ranges_join_with |
| 71 | #define __glibcxx_want_ranges_repeat |
| 72 | #define __glibcxx_want_ranges_slide |
| 73 | #define __glibcxx_want_ranges_stride |
| 74 | #define __glibcxx_want_ranges_to_container |
| 75 | #define __glibcxx_want_ranges_as_input |
| 76 | #define __glibcxx_want_ranges_zip |
| 77 | #include <bits/version.h> |
| 78 | |
| 79 | #ifdef __glibcxx_generator // C++ >= 23 && __glibcxx_coroutine |
| 80 | # include <bits/elements_of.h> |
| 81 | #endif |
| 82 | |
| 83 | /** |
| 84 | * @defgroup ranges Ranges |
| 85 | * |
| 86 | * Components for dealing with ranges of elements. |
| 87 | */ |
| 88 | |
| 89 | namespace std _GLIBCXX_VISIBILITY(default) |
| 90 | { |
| 91 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 92 | namespace ranges |
| 93 | { |
| 94 | // [range.access] customization point objects |
| 95 | // [range.req] range and view concepts |
| 96 | // [range.dangling] dangling iterator handling |
| 97 | // Defined in <bits/ranges_base.h> |
| 98 | |
| 99 | // [view.interface] View interface |
| 100 | // [range.subrange] Sub-ranges |
| 101 | // Defined in <bits/ranges_util.h> |
| 102 | |
| 103 | // C++20 24.6 [range.factories] Range factories |
| 104 | |
| 105 | /// A view that contains no elements. |
| 106 | template<typename _Tp> requires is_object_v<_Tp> |
| 107 | class empty_view |
| 108 | : public view_interface<empty_view<_Tp>> |
| 109 | { |
| 110 | public: |
| 111 | static constexpr _Tp* begin() noexcept { return nullptr; } |
| 112 | static constexpr _Tp* end() noexcept { return nullptr; } |
| 113 | static constexpr _Tp* data() noexcept { return nullptr; } |
| 114 | static constexpr size_t size() noexcept { return 0; } |
| 115 | static constexpr bool empty() noexcept { return true; } |
| 116 | }; |
| 117 | |
| 118 | template<typename _Tp> |
| 119 | inline constexpr bool enable_borrowed_range<empty_view<_Tp>> = true; |
| 120 | |
| 121 | namespace __detail |
| 122 | { |
| 123 | #if __cpp_lib_ranges >= 202207L // C++ >= 23 |
| 124 | // P2494R2 Relaxing range adaptors to allow for move only types |
| 125 | template<typename _Tp> |
| 126 | concept __boxable = move_constructible<_Tp> && is_object_v<_Tp>; |
| 127 | #else |
| 128 | template<typename _Tp> |
| 129 | concept __boxable = copy_constructible<_Tp> && is_object_v<_Tp>; |
| 130 | #endif |
| 131 | |
| 132 | template<__boxable _Tp> |
| 133 | struct __box : std::optional<_Tp> |
| 134 | { |
| 135 | using std::optional<_Tp>::optional; |
| 136 | |
| 137 | constexpr |
| 138 | __box() |
| 139 | noexcept(is_nothrow_default_constructible_v<_Tp>) |
| 140 | requires default_initializable<_Tp> |
| 141 | : std::optional<_Tp>{std::in_place} |
| 142 | { } |
| 143 | |
| 144 | __box(const __box&) = default; |
| 145 | __box(__box&&) = default; |
| 146 | |
| 147 | using std::optional<_Tp>::operator=; |
| 148 | |
| 149 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 150 | // 3477. Simplify constraints for semiregular-box |
| 151 | // 3572. copyable-box should be fully constexpr |
| 152 | constexpr __box& |
| 153 | operator=(const __box& __that) |
| 154 | noexcept(is_nothrow_copy_constructible_v<_Tp>) |
| 155 | requires (!copyable<_Tp>) && copy_constructible<_Tp> |
| 156 | { |
| 157 | if (this != std::__addressof(__that)) |
| 158 | { |
| 159 | if ((bool)__that) |
| 160 | this->emplace(*__that); |
| 161 | else |
| 162 | this->reset(); |
| 163 | } |
| 164 | return *this; |
| 165 | } |
| 166 | |
| 167 | constexpr __box& |
| 168 | operator=(__box&& __that) |
| 169 | noexcept(is_nothrow_move_constructible_v<_Tp>) |
| 170 | requires (!movable<_Tp>) |
| 171 | { |
| 172 | if (this != std::__addressof(__that)) |
| 173 | { |
| 174 | if ((bool)__that) |
| 175 | this->emplace(std::move(*__that)); |
| 176 | else |
| 177 | this->reset(); |
| 178 | } |
| 179 | return *this; |
| 180 | } |
| 181 | }; |
| 182 | |
| 183 | template<typename _Tp> |
| 184 | concept __boxable_copyable |
| 185 | = copy_constructible<_Tp> |
| 186 | && (copyable<_Tp> || (is_nothrow_move_constructible_v<_Tp> |
| 187 | && is_nothrow_copy_constructible_v<_Tp>)); |
| 188 | template<typename _Tp> |
| 189 | concept __boxable_movable |
| 190 | = (!copy_constructible<_Tp>) |
| 191 | && (movable<_Tp> || is_nothrow_move_constructible_v<_Tp>); |
| 192 | |
| 193 | // For types which are already copyable (or since C++23, movable) |
| 194 | // this specialization of the box wrapper stores the object directly |
| 195 | // without going through std::optional. It provides just the subset of |
| 196 | // the primary template's API that we currently use. |
| 197 | template<__boxable _Tp> |
| 198 | requires __boxable_copyable<_Tp> || __boxable_movable<_Tp> |
| 199 | struct __box<_Tp> |
| 200 | { |
| 201 | private: |
| 202 | [[no_unique_address]] _Tp _M_value = _Tp(); |
| 203 | |
| 204 | public: |
| 205 | __box() requires default_initializable<_Tp> = default; |
| 206 | |
| 207 | constexpr explicit |
| 208 | __box(const _Tp& __t) |
| 209 | noexcept(is_nothrow_copy_constructible_v<_Tp>) |
| 210 | requires copy_constructible<_Tp> |
| 211 | : _M_value(__t) |
| 212 | { } |
| 213 | |
| 214 | constexpr explicit |
| 215 | __box(_Tp&& __t) |
| 216 | noexcept(is_nothrow_move_constructible_v<_Tp>) |
| 217 | : _M_value(std::move(__t)) |
| 218 | { } |
| 219 | |
| 220 | template<typename... _Args> |
| 221 | requires constructible_from<_Tp, _Args...> |
| 222 | constexpr explicit |
| 223 | __box(in_place_t, _Args&&... __args) |
| 224 | noexcept(is_nothrow_constructible_v<_Tp, _Args...>) |
| 225 | : _M_value(std::forward<_Args>(__args)...) |
| 226 | { } |
| 227 | |
| 228 | __box(const __box&) = default; |
| 229 | __box(__box&&) = default; |
| 230 | __box& operator=(const __box&) requires copyable<_Tp> = default; |
| 231 | __box& operator=(__box&&) requires movable<_Tp> = default; |
| 232 | |
| 233 | // When _Tp is nothrow_copy_constructible but not copy_assignable, |
| 234 | // copy assignment is implemented via destroy-then-copy-construct. |
| 235 | constexpr __box& |
| 236 | operator=(const __box& __that) noexcept |
| 237 | requires (!copyable<_Tp>) && copy_constructible<_Tp> |
| 238 | { |
| 239 | static_assert(is_nothrow_copy_constructible_v<_Tp>); |
| 240 | if (this != std::__addressof(__that)) |
| 241 | { |
| 242 | _M_value.~_Tp(); |
| 243 | std::construct_at(std::__addressof(_M_value), *__that); |
| 244 | } |
| 245 | return *this; |
| 246 | } |
| 247 | |
| 248 | // Likewise for move assignment. |
| 249 | constexpr __box& |
| 250 | operator=(__box&& __that) noexcept |
| 251 | requires (!movable<_Tp>) |
| 252 | { |
| 253 | static_assert(is_nothrow_move_constructible_v<_Tp>); |
| 254 | if (this != std::__addressof(__that)) |
| 255 | { |
| 256 | _M_value.~_Tp(); |
| 257 | std::construct_at(std::__addressof(_M_value), std::move(*__that)); |
| 258 | } |
| 259 | return *this; |
| 260 | } |
| 261 | |
| 262 | constexpr bool |
| 263 | has_value() const noexcept |
| 264 | { return true; }; |
| 265 | |
| 266 | constexpr _Tp& |
| 267 | operator*() & noexcept |
| 268 | { return _M_value; } |
| 269 | |
| 270 | constexpr const _Tp& |
| 271 | operator*() const & noexcept |
| 272 | { return _M_value; } |
| 273 | |
| 274 | constexpr _Tp&& |
| 275 | operator*() && noexcept |
| 276 | { return std::move(_M_value); } |
| 277 | |
| 278 | constexpr const _Tp&& |
| 279 | operator*() const && noexcept |
| 280 | { return std::move(_M_value); } |
| 281 | |
| 282 | constexpr _Tp* |
| 283 | operator->() noexcept |
| 284 | { return std::__addressof(_M_value); } |
| 285 | |
| 286 | constexpr const _Tp* |
| 287 | operator->() const noexcept |
| 288 | { return std::__addressof(_M_value); } |
| 289 | }; |
| 290 | |
| 291 | namespace __func_handle |
| 292 | { |
| 293 | template<typename _Fn> |
| 294 | struct _Inplace |
| 295 | { |
| 296 | _Inplace() = default; |
| 297 | |
| 298 | constexpr explicit |
| 299 | _Inplace(_Fn __func) noexcept |
| 300 | : _M_fn(__func) |
| 301 | { } |
| 302 | |
| 303 | template<typename... _Iters> |
| 304 | constexpr decltype(auto) |
| 305 | _M_call_deref(const _Iters&... __iters) const |
| 306 | noexcept(noexcept(_M_fn(*__iters...))) |
| 307 | { return _M_fn(*__iters...); } |
| 308 | |
| 309 | template<typename _DistType, typename... _Iters> |
| 310 | constexpr decltype(auto) |
| 311 | _M_call_subscript(const _DistType __n, const _Iters&... __iters) const |
| 312 | noexcept(noexcept(_M_fn(__iters[iter_difference_t<_Iters>(__n)]...))) |
| 313 | { return _M_fn(__iters[iter_difference_t<_Iters>(__n)]...); } |
| 314 | |
| 315 | private: |
| 316 | [[no_unique_address]] _Fn _M_fn = _Fn(); |
| 317 | }; |
| 318 | |
| 319 | template<typename _Fn> |
| 320 | struct _InplaceMemPtr |
| 321 | { |
| 322 | _InplaceMemPtr() = default; |
| 323 | |
| 324 | constexpr explicit |
| 325 | _InplaceMemPtr(_Fn __func) noexcept |
| 326 | : _M_ptr(__func) |
| 327 | {} |
| 328 | |
| 329 | template<typename... _Iters> |
| 330 | constexpr decltype(auto) |
| 331 | _M_call_deref(const _Iters&... __iters) const |
| 332 | noexcept(noexcept(std::__invoke(_M_ptr, *__iters...))) |
| 333 | { return std::__invoke(_M_ptr, *__iters...); } |
| 334 | |
| 335 | template<typename _DistType, typename... _Iters> |
| 336 | constexpr decltype(auto) |
| 337 | _M_call_subscript(const _DistType __n, const _Iters&... __iters) const |
| 338 | noexcept(noexcept(std::__invoke(_M_ptr, __iters[iter_difference_t<_Iters>(__n)]...))) |
| 339 | { return std::__invoke(_M_ptr, __iters[iter_difference_t<_Iters>(__n)]...); } |
| 340 | |
| 341 | private: |
| 342 | _Fn _M_ptr = nullptr; |
| 343 | }; |
| 344 | |
| 345 | template<typename _Fn> |
| 346 | struct _ViaPointer |
| 347 | { |
| 348 | _ViaPointer() = default; |
| 349 | |
| 350 | constexpr explicit |
| 351 | _ViaPointer(_Fn& __func) noexcept |
| 352 | : _M_ptr(std::addressof(__func)) |
| 353 | { } |
| 354 | |
| 355 | template<typename _Un> |
| 356 | requires (!is_const_v<_Un>) && is_same_v<const _Un, _Fn> |
| 357 | constexpr |
| 358 | _ViaPointer(_ViaPointer<_Un> __other) noexcept |
| 359 | : _M_ptr(__other._M_ptr) |
| 360 | { } |
| 361 | |
| 362 | template<typename... _Iters> |
| 363 | constexpr decltype(auto) |
| 364 | _M_call_deref(const _Iters&... __iters) const |
| 365 | noexcept(noexcept((*_M_ptr)(*__iters...))) |
| 366 | { return (*_M_ptr)(*__iters...); } |
| 367 | |
| 368 | template<typename _DistType, typename... _Iters> |
| 369 | constexpr decltype(auto) |
| 370 | _M_call_subscript(const _DistType __n, const _Iters&... __iters) const |
| 371 | noexcept(noexcept((*_M_ptr)(__iters[iter_difference_t<_Iters>(__n)]...))) |
| 372 | { return (*_M_ptr)(__iters[iter_difference_t<_Iters>(__n)]...); } |
| 373 | |
| 374 | private: |
| 375 | _Fn* _M_ptr = nullptr; |
| 376 | |
| 377 | template<typename> |
| 378 | friend struct _ViaPointer; |
| 379 | }; |
| 380 | |
| 381 | template<typename _Fn> |
| 382 | struct _StaticCall |
| 383 | { |
| 384 | _StaticCall() = default; |
| 385 | |
| 386 | constexpr explicit |
| 387 | _StaticCall(const _Fn&) noexcept |
| 388 | {} |
| 389 | |
| 390 | template<typename... _Iters> |
| 391 | static constexpr decltype(auto) |
| 392 | _M_call_deref(const _Iters&... __iters) |
| 393 | noexcept(noexcept(_Fn::operator()(*__iters...))) |
| 394 | { return _Fn::operator()(*__iters...); } |
| 395 | |
| 396 | template<typename _DistType, typename... _Iters> |
| 397 | static constexpr decltype(auto) |
| 398 | _M_call_subscript(_DistType __n, const _Iters&... __iters) |
| 399 | noexcept(noexcept(_Fn::operator()(__iters[iter_difference_t<_Iters>(__n)]...))) |
| 400 | { return _Fn::operator()(__iters[iter_difference_t<_Iters>(__n)]...); } |
| 401 | }; |
| 402 | |
| 403 | template<typename _Fn, typename... _Iters> |
| 404 | consteval auto |
| 405 | __select() |
| 406 | { |
| 407 | using _Fd = remove_cv_t<_Fn>; |
| 408 | if constexpr (is_member_pointer_v<_Fd>) |
| 409 | return __func_handle::_InplaceMemPtr<_Fd>(); |
| 410 | else if constexpr (is_function_v<remove_pointer_t<_Fd>>) |
| 411 | return __func_handle::_Inplace<_Fd>(); |
| 412 | else if constexpr (__is_std_op_wrapper<_Fd>) |
| 413 | return __func_handle::_Inplace<_Fd>(); |
| 414 | else if constexpr (requires (const _Iters&... __iters) |
| 415 | { _Fd::operator()(*__iters...); }) |
| 416 | return __func_handle::_StaticCall<_Fd>(); |
| 417 | else |
| 418 | return __func_handle::_ViaPointer<_Fn>(); |
| 419 | }; |
| 420 | } // __func_handle |
| 421 | |
| 422 | template<typename _Fn, typename... _Iters> |
| 423 | using __func_handle_t = decltype(__func_handle::__select<_Fn, _Iters...>()); |
| 424 | } // namespace __detail |
| 425 | |
| 426 | /// A view that contains exactly one element. |
| 427 | #if __cpp_lib_ranges >= 202207L // C++ >= 23 |
| 428 | template<move_constructible _Tp> |
| 429 | #else |
| 430 | template<copy_constructible _Tp> |
| 431 | #endif |
| 432 | requires is_object_v<_Tp> |
| 433 | class single_view : public view_interface<single_view<_Tp>> |
| 434 | { |
| 435 | public: |
| 436 | single_view() requires default_initializable<_Tp> = default; |
| 437 | |
| 438 | constexpr explicit |
| 439 | single_view(const _Tp& __t) |
| 440 | noexcept(is_nothrow_copy_constructible_v<_Tp>) |
| 441 | requires copy_constructible<_Tp> |
| 442 | : _M_value(__t) |
| 443 | { } |
| 444 | |
| 445 | constexpr explicit |
| 446 | single_view(_Tp&& __t) |
| 447 | noexcept(is_nothrow_move_constructible_v<_Tp>) |
| 448 | : _M_value(std::move(__t)) |
| 449 | { } |
| 450 | |
| 451 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 452 | // 3428. single_view's in place constructor should be explicit |
| 453 | template<typename... _Args> |
| 454 | requires constructible_from<_Tp, _Args...> |
| 455 | constexpr explicit |
| 456 | single_view(in_place_t, _Args&&... __args) |
| 457 | noexcept(is_nothrow_constructible_v<_Tp, _Args...>) |
| 458 | : _M_value{in_place, std::forward<_Args>(__args)...} |
| 459 | { } |
| 460 | |
| 461 | constexpr _Tp* |
| 462 | begin() noexcept |
| 463 | { return data(); } |
| 464 | |
| 465 | constexpr const _Tp* |
| 466 | begin() const noexcept |
| 467 | { return data(); } |
| 468 | |
| 469 | constexpr _Tp* |
| 470 | end() noexcept |
| 471 | { return data() + 1; } |
| 472 | |
| 473 | constexpr const _Tp* |
| 474 | end() const noexcept |
| 475 | { return data() + 1; } |
| 476 | |
| 477 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 478 | // 4035. single_view should provide empty |
| 479 | static constexpr bool |
| 480 | empty() noexcept |
| 481 | { return false; } |
| 482 | |
| 483 | static constexpr size_t |
| 484 | size() noexcept |
| 485 | { return 1; } |
| 486 | |
| 487 | constexpr _Tp* |
| 488 | data() noexcept |
| 489 | { return _M_value.operator->(); } |
| 490 | |
| 491 | constexpr const _Tp* |
| 492 | data() const noexcept |
| 493 | { return _M_value.operator->(); } |
| 494 | |
| 495 | private: |
| 496 | [[no_unique_address]] __detail::__box<_Tp> _M_value; |
| 497 | }; |
| 498 | |
| 499 | template<typename _Tp> |
| 500 | single_view(_Tp) -> single_view<_Tp>; |
| 501 | |
| 502 | namespace __detail |
| 503 | { |
| 504 | template<typename _Wp> |
| 505 | constexpr auto __to_signed_like(_Wp __w) noexcept |
| 506 | { |
| 507 | if constexpr (!integral<_Wp>) |
| 508 | return iter_difference_t<_Wp>(); |
| 509 | else if constexpr (sizeof(iter_difference_t<_Wp>) > sizeof(_Wp)) |
| 510 | return iter_difference_t<_Wp>(__w); |
| 511 | else if constexpr (sizeof(ptrdiff_t) > sizeof(_Wp)) |
| 512 | return ptrdiff_t(__w); |
| 513 | else if constexpr (sizeof(long long) > sizeof(_Wp)) |
| 514 | return (long long)(__w); |
| 515 | #ifdef __SIZEOF_INT128__ |
| 516 | else if constexpr (__SIZEOF_INT128__ > sizeof(_Wp)) |
| 517 | return __int128(__w); |
| 518 | #endif |
| 519 | else |
| 520 | return __max_diff_type(__w); |
| 521 | } |
| 522 | |
| 523 | template<typename _Wp> |
| 524 | using __iota_diff_t = decltype(__to_signed_like(std::declval<_Wp>())); |
| 525 | |
| 526 | template<typename _It> |
| 527 | concept __decrementable = incrementable<_It> |
| 528 | && requires(_It __i) |
| 529 | { |
| 530 | { --__i } -> same_as<_It&>; |
| 531 | { __i-- } -> same_as<_It>; |
| 532 | }; |
| 533 | |
| 534 | template<typename _It> |
| 535 | concept __advanceable = __decrementable<_It> && totally_ordered<_It> |
| 536 | && requires( _It __i, const _It __j, const __iota_diff_t<_It> __n) |
| 537 | { |
| 538 | { __i += __n } -> same_as<_It&>; |
| 539 | { __i -= __n } -> same_as<_It&>; |
| 540 | _It(__j + __n); |
| 541 | _It(__n + __j); |
| 542 | _It(__j - __n); |
| 543 | { __j - __j } -> convertible_to<__iota_diff_t<_It>>; |
| 544 | }; |
| 545 | |
| 546 | template<typename _Winc> |
| 547 | struct __iota_view_iter_cat |
| 548 | { }; |
| 549 | |
| 550 | template<incrementable _Winc> |
| 551 | struct __iota_view_iter_cat<_Winc> |
| 552 | { using iterator_category = input_iterator_tag; }; |
| 553 | } // namespace __detail |
| 554 | |
| 555 | template<weakly_incrementable _Winc, |
| 556 | semiregular _Bound = unreachable_sentinel_t> |
| 557 | requires std::__detail::__weakly_eq_cmp_with<_Winc, _Bound> |
| 558 | && copyable<_Winc> |
| 559 | class iota_view : public view_interface<iota_view<_Winc, _Bound>> |
| 560 | { |
| 561 | private: |
| 562 | struct _Sentinel; |
| 563 | |
| 564 | struct _Iterator : __detail::__iota_view_iter_cat<_Winc> |
| 565 | { |
| 566 | private: |
| 567 | static auto |
| 568 | _S_iter_concept() |
| 569 | { |
| 570 | using namespace __detail; |
| 571 | if constexpr (__advanceable<_Winc>) |
| 572 | return random_access_iterator_tag{}; |
| 573 | else if constexpr (__decrementable<_Winc>) |
| 574 | return bidirectional_iterator_tag{}; |
| 575 | else if constexpr (incrementable<_Winc>) |
| 576 | return forward_iterator_tag{}; |
| 577 | else |
| 578 | return input_iterator_tag{}; |
| 579 | } |
| 580 | |
| 581 | public: |
| 582 | using iterator_concept = decltype(_S_iter_concept()); |
| 583 | // iterator_category defined in __iota_view_iter_cat |
| 584 | using value_type = _Winc; |
| 585 | using difference_type = __detail::__iota_diff_t<_Winc>; |
| 586 | |
| 587 | _Iterator() requires default_initializable<_Winc> = default; |
| 588 | |
| 589 | constexpr explicit |
| 590 | _Iterator(_Winc __value) |
| 591 | : _M_value(__value) { } |
| 592 | |
| 593 | constexpr _Winc |
| 594 | operator*() const noexcept(is_nothrow_copy_constructible_v<_Winc>) |
| 595 | { return _M_value; } |
| 596 | |
| 597 | constexpr _Iterator& |
| 598 | operator++() |
| 599 | { |
| 600 | ++_M_value; |
| 601 | return *this; |
| 602 | } |
| 603 | |
| 604 | constexpr void |
| 605 | operator++(int) |
| 606 | { ++*this; } |
| 607 | |
| 608 | constexpr _Iterator |
| 609 | operator++(int) requires incrementable<_Winc> |
| 610 | { |
| 611 | auto __tmp = *this; |
| 612 | ++*this; |
| 613 | return __tmp; |
| 614 | } |
| 615 | |
| 616 | constexpr _Iterator& |
| 617 | operator--() requires __detail::__decrementable<_Winc> |
| 618 | { |
| 619 | --_M_value; |
| 620 | return *this; |
| 621 | } |
| 622 | |
| 623 | constexpr _Iterator |
| 624 | operator--(int) requires __detail::__decrementable<_Winc> |
| 625 | { |
| 626 | auto __tmp = *this; |
| 627 | --*this; |
| 628 | return __tmp; |
| 629 | } |
| 630 | |
| 631 | constexpr _Iterator& |
| 632 | operator+=(difference_type __n) requires __detail::__advanceable<_Winc> |
| 633 | { |
| 634 | using __detail::__is_integer_like; |
| 635 | using __detail::__is_signed_integer_like; |
| 636 | if constexpr (__is_integer_like<_Winc> |
| 637 | && !__is_signed_integer_like<_Winc>) |
| 638 | { |
| 639 | if (__n >= difference_type(0)) |
| 640 | _M_value += static_cast<_Winc>(__n); |
| 641 | else |
| 642 | _M_value -= static_cast<_Winc>(-__n); |
| 643 | } |
| 644 | else |
| 645 | _M_value += __n; |
| 646 | return *this; |
| 647 | } |
| 648 | |
| 649 | constexpr _Iterator& |
| 650 | operator-=(difference_type __n) requires __detail::__advanceable<_Winc> |
| 651 | { |
| 652 | using __detail::__is_integer_like; |
| 653 | using __detail::__is_signed_integer_like; |
| 654 | if constexpr (__is_integer_like<_Winc> |
| 655 | && !__is_signed_integer_like<_Winc>) |
| 656 | { |
| 657 | if (__n >= difference_type(0)) |
| 658 | _M_value -= static_cast<_Winc>(__n); |
| 659 | else |
| 660 | _M_value += static_cast<_Winc>(-__n); |
| 661 | } |
| 662 | else |
| 663 | _M_value -= __n; |
| 664 | return *this; |
| 665 | } |
| 666 | |
| 667 | constexpr _Winc |
| 668 | operator[](difference_type __n) const |
| 669 | requires __detail::__advanceable<_Winc> |
| 670 | { return _Winc(_M_value + __n); } |
| 671 | |
| 672 | friend constexpr bool |
| 673 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 674 | requires equality_comparable<_Winc> |
| 675 | { return __x._M_value == __y._M_value; } |
| 676 | |
| 677 | friend constexpr bool |
| 678 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 679 | requires totally_ordered<_Winc> |
| 680 | { return __x._M_value < __y._M_value; } |
| 681 | |
| 682 | friend constexpr bool |
| 683 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 684 | requires totally_ordered<_Winc> |
| 685 | { return __y < __x; } |
| 686 | |
| 687 | friend constexpr bool |
| 688 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 689 | requires totally_ordered<_Winc> |
| 690 | { return !(__y < __x); } |
| 691 | |
| 692 | friend constexpr bool |
| 693 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 694 | requires totally_ordered<_Winc> |
| 695 | { return !(__x < __y); } |
| 696 | |
| 697 | #ifdef __cpp_lib_three_way_comparison |
| 698 | friend constexpr auto |
| 699 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 700 | requires totally_ordered<_Winc> && three_way_comparable<_Winc> |
| 701 | { return __x._M_value <=> __y._M_value; } |
| 702 | #endif |
| 703 | |
| 704 | friend constexpr _Iterator |
| 705 | operator+(_Iterator __i, difference_type __n) |
| 706 | requires __detail::__advanceable<_Winc> |
| 707 | { |
| 708 | __i += __n; |
| 709 | return __i; |
| 710 | } |
| 711 | |
| 712 | friend constexpr _Iterator |
| 713 | operator+(difference_type __n, _Iterator __i) |
| 714 | requires __detail::__advanceable<_Winc> |
| 715 | { return __i += __n; } |
| 716 | |
| 717 | friend constexpr _Iterator |
| 718 | operator-(_Iterator __i, difference_type __n) |
| 719 | requires __detail::__advanceable<_Winc> |
| 720 | { |
| 721 | __i -= __n; |
| 722 | return __i; |
| 723 | } |
| 724 | |
| 725 | friend constexpr difference_type |
| 726 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 727 | requires __detail::__advanceable<_Winc> |
| 728 | { |
| 729 | using __detail::__is_integer_like; |
| 730 | using __detail::__is_signed_integer_like; |
| 731 | using _Dt = difference_type; |
| 732 | if constexpr (__is_integer_like<_Winc>) |
| 733 | { |
| 734 | if constexpr (__is_signed_integer_like<_Winc>) |
| 735 | return _Dt(_Dt(__x._M_value) - _Dt(__y._M_value)); |
| 736 | else |
| 737 | return (__y._M_value > __x._M_value) |
| 738 | ? _Dt(-_Dt(__y._M_value - __x._M_value)) |
| 739 | : _Dt(__x._M_value - __y._M_value); |
| 740 | } |
| 741 | else |
| 742 | return __x._M_value - __y._M_value; |
| 743 | } |
| 744 | |
| 745 | private: |
| 746 | _Winc _M_value = _Winc(); |
| 747 | |
| 748 | friend iota_view; |
| 749 | friend _Sentinel; |
| 750 | }; |
| 751 | |
| 752 | struct _Sentinel |
| 753 | { |
| 754 | private: |
| 755 | _Bound _M_bound = _Bound(); |
| 756 | |
| 757 | public: |
| 758 | _Sentinel() = default; |
| 759 | |
| 760 | constexpr explicit |
| 761 | _Sentinel(_Bound __bound) |
| 762 | : _M_bound(__bound) { } |
| 763 | |
| 764 | friend constexpr bool |
| 765 | operator==(const _Iterator& __x, const _Sentinel& __y) |
| 766 | { return __x._M_value == __y._M_bound; } |
| 767 | |
| 768 | friend constexpr iter_difference_t<_Winc> |
| 769 | operator-(const _Iterator& __x, const _Sentinel& __y) |
| 770 | requires sized_sentinel_for<_Bound, _Winc> |
| 771 | { return -(__y._M_bound - __x._M_value); } |
| 772 | |
| 773 | friend constexpr iter_difference_t<_Winc> |
| 774 | operator-(const _Sentinel& __x, const _Iterator& __y) |
| 775 | requires sized_sentinel_for<_Bound, _Winc> |
| 776 | { return __x._M_bound - __y._M_value; } |
| 777 | |
| 778 | friend iota_view; |
| 779 | }; |
| 780 | |
| 781 | _Winc _M_value = _Winc(); |
| 782 | [[no_unique_address]] _Bound _M_bound = _Bound(); |
| 783 | |
| 784 | public: |
| 785 | iota_view() requires default_initializable<_Winc> = default; |
| 786 | |
| 787 | constexpr explicit |
| 788 | iota_view(_Winc __value) |
| 789 | : _M_value(__value) |
| 790 | { } |
| 791 | |
| 792 | constexpr explicit |
| 793 | iota_view(type_identity_t<_Winc> __value, |
| 794 | type_identity_t<_Bound> __bound) |
| 795 | : _M_value(__value), _M_bound(__bound) |
| 796 | { |
| 797 | if constexpr (totally_ordered_with<_Winc, _Bound>) |
| 798 | __glibcxx_assert( bool(__value <= __bound) ); |
| 799 | } |
| 800 | |
| 801 | constexpr explicit |
| 802 | iota_view(_Iterator __first, _Iterator __last) |
| 803 | requires same_as<_Winc, _Bound> |
| 804 | : iota_view(__first._M_value, __last._M_value) |
| 805 | { } |
| 806 | |
| 807 | constexpr explicit |
| 808 | iota_view(_Iterator __first, unreachable_sentinel_t __last) |
| 809 | requires same_as<_Bound, unreachable_sentinel_t> |
| 810 | : iota_view(__first._M_value, __last) |
| 811 | { } |
| 812 | |
| 813 | constexpr explicit |
| 814 | iota_view(_Iterator __first, _Sentinel __last) |
| 815 | requires (!same_as<_Winc, _Bound>) && (!same_as<_Bound, unreachable_sentinel_t>) |
| 816 | : iota_view(__first._M_value, __last._M_bound) |
| 817 | { } |
| 818 | |
| 819 | constexpr _Iterator |
| 820 | begin() const { return _Iterator{_M_value}; } |
| 821 | |
| 822 | constexpr auto |
| 823 | end() const |
| 824 | { |
| 825 | if constexpr (same_as<_Bound, unreachable_sentinel_t>) |
| 826 | return unreachable_sentinel; |
| 827 | else |
| 828 | return _Sentinel{_M_bound}; |
| 829 | } |
| 830 | |
| 831 | constexpr _Iterator |
| 832 | end() const requires same_as<_Winc, _Bound> |
| 833 | { return _Iterator{_M_bound}; } |
| 834 | |
| 835 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 836 | // 4001. iota_view should provide empty |
| 837 | constexpr bool |
| 838 | empty() const |
| 839 | { return _M_value == _M_bound; } |
| 840 | |
| 841 | constexpr auto |
| 842 | size() const |
| 843 | requires (same_as<_Winc, _Bound> && __detail::__advanceable<_Winc>) |
| 844 | || (integral<_Winc> && integral<_Bound>) |
| 845 | || sized_sentinel_for<_Bound, _Winc> |
| 846 | { |
| 847 | using __detail::__is_integer_like; |
| 848 | using __detail::__to_unsigned_like; |
| 849 | if constexpr (integral<_Winc> && integral<_Bound>) |
| 850 | { |
| 851 | using _Up = make_unsigned_t<decltype(_M_bound - _M_value)>; |
| 852 | return _Up(_M_bound) - _Up(_M_value); |
| 853 | } |
| 854 | else if constexpr (__is_integer_like<_Winc>) |
| 855 | return __to_unsigned_like(_M_bound) - __to_unsigned_like(_M_value); |
| 856 | else |
| 857 | return __to_unsigned_like(_M_bound - _M_value); |
| 858 | } |
| 859 | }; |
| 860 | |
| 861 | template<typename _Winc, typename _Bound> |
| 862 | requires (!__detail::__is_integer_like<_Winc> |
| 863 | || !__detail::__is_integer_like<_Bound> |
| 864 | || (__detail::__is_signed_integer_like<_Winc> |
| 865 | == __detail::__is_signed_integer_like<_Bound>)) |
| 866 | iota_view(_Winc, _Bound) -> iota_view<_Winc, _Bound>; |
| 867 | |
| 868 | template<typename _Winc, typename _Bound> |
| 869 | inline constexpr bool |
| 870 | enable_borrowed_range<iota_view<_Winc, _Bound>> = true; |
| 871 | |
| 872 | namespace views |
| 873 | { |
| 874 | template<typename _Tp> |
| 875 | inline constexpr empty_view<_Tp> empty{}; |
| 876 | |
| 877 | namespace __detail |
| 878 | { |
| 879 | template<typename _Tp> |
| 880 | concept __can_single_view |
| 881 | = requires { single_view<decay_t<_Tp>>(std::declval<_Tp>()); }; |
| 882 | } // namespace __detail |
| 883 | |
| 884 | struct _Single |
| 885 | { |
| 886 | template<__detail::__can_single_view _Tp> |
| 887 | constexpr auto |
| 888 | operator() [[nodiscard]] (_Tp&& __e) const |
| 889 | noexcept(noexcept(single_view<decay_t<_Tp>>(std::forward<_Tp>(__e)))) |
| 890 | { return single_view<decay_t<_Tp>>(std::forward<_Tp>(__e)); } |
| 891 | }; |
| 892 | |
| 893 | inline constexpr _Single single{}; |
| 894 | |
| 895 | namespace __detail |
| 896 | { |
| 897 | template<typename... _Args> |
| 898 | concept __can_iota_view = requires { iota_view(std::declval<_Args>()...); }; |
| 899 | } // namespace __detail |
| 900 | |
| 901 | struct _Iota |
| 902 | { |
| 903 | template<__detail::__can_iota_view _Tp> |
| 904 | constexpr auto |
| 905 | operator() [[nodiscard]] (_Tp&& __e) const |
| 906 | { return iota_view(std::forward<_Tp>(__e)); } |
| 907 | |
| 908 | template<typename _Tp, typename _Up> |
| 909 | requires __detail::__can_iota_view<_Tp, _Up> |
| 910 | constexpr auto |
| 911 | operator() [[nodiscard]] (_Tp&& __e, _Up&& __f) const |
| 912 | { return iota_view(std::forward<_Tp>(__e), std::forward<_Up>(__f)); } |
| 913 | }; |
| 914 | |
| 915 | inline constexpr _Iota iota{}; |
| 916 | |
| 917 | #ifdef __cpp_lib_ranges_indices // C++ >= 26 |
| 918 | struct _Indices |
| 919 | { |
| 920 | template<ranges::__detail::__is_integer_like _Tp> |
| 921 | requires __detail::__can_iota_view<_Tp> |
| 922 | [[nodiscard]] constexpr auto |
| 923 | operator() (_Tp __e) const noexcept |
| 924 | { return iota(_Tp{}, __e); } |
| 925 | }; |
| 926 | |
| 927 | inline constexpr _Indices indices{}; |
| 928 | #endif // __cpp_lib_ranges_indices |
| 929 | } // namespace views |
| 930 | |
| 931 | #if _GLIBCXX_HOSTED |
| 932 | namespace __detail |
| 933 | { |
| 934 | template<typename _Val, typename _CharT, typename _Traits> |
| 935 | concept __stream_extractable |
| 936 | = requires(basic_istream<_CharT, _Traits>& is, _Val& t) { is >> t; }; |
| 937 | } // namespace __detail |
| 938 | |
| 939 | template<movable _Val, typename _CharT, |
| 940 | typename _Traits = char_traits<_CharT>> |
| 941 | requires default_initializable<_Val> |
| 942 | && __detail::__stream_extractable<_Val, _CharT, _Traits> |
| 943 | class basic_istream_view |
| 944 | : public view_interface<basic_istream_view<_Val, _CharT, _Traits>> |
| 945 | { |
| 946 | public: |
| 947 | constexpr explicit |
| 948 | basic_istream_view(basic_istream<_CharT, _Traits>& __stream) |
| 949 | : _M_stream(std::__addressof(__stream)) |
| 950 | { } |
| 951 | |
| 952 | constexpr auto |
| 953 | begin() |
| 954 | { |
| 955 | *_M_stream >> _M_object; |
| 956 | return _Iterator{this}; |
| 957 | } |
| 958 | |
| 959 | constexpr default_sentinel_t |
| 960 | end() const noexcept |
| 961 | { return default_sentinel; } |
| 962 | |
| 963 | private: |
| 964 | basic_istream<_CharT, _Traits>* _M_stream; |
| 965 | _Val _M_object = _Val(); |
| 966 | |
| 967 | struct _Iterator |
| 968 | { |
| 969 | public: |
| 970 | using iterator_concept = input_iterator_tag; |
| 971 | using difference_type = ptrdiff_t; |
| 972 | using value_type = _Val; |
| 973 | |
| 974 | constexpr explicit |
| 975 | _Iterator(basic_istream_view* __parent) noexcept |
| 976 | : _M_parent(__parent) |
| 977 | { } |
| 978 | |
| 979 | _Iterator(const _Iterator&) = delete; |
| 980 | _Iterator(_Iterator&&) = default; |
| 981 | _Iterator& operator=(const _Iterator&) = delete; |
| 982 | _Iterator& operator=(_Iterator&&) = default; |
| 983 | |
| 984 | _Iterator& |
| 985 | operator++() |
| 986 | { |
| 987 | *_M_parent->_M_stream >> _M_parent->_M_object; |
| 988 | return *this; |
| 989 | } |
| 990 | |
| 991 | void |
| 992 | operator++(int) |
| 993 | { ++*this; } |
| 994 | |
| 995 | _Val& |
| 996 | operator*() const |
| 997 | { return _M_parent->_M_object; } |
| 998 | |
| 999 | friend bool |
| 1000 | operator==(const _Iterator& __x, default_sentinel_t) |
| 1001 | { return !*__x._M_parent->_M_stream; } |
| 1002 | |
| 1003 | private: |
| 1004 | basic_istream_view* _M_parent; |
| 1005 | }; |
| 1006 | |
| 1007 | friend _Iterator; |
| 1008 | }; |
| 1009 | |
| 1010 | template<typename _Val> |
| 1011 | using istream_view = basic_istream_view<_Val, char>; |
| 1012 | |
| 1013 | template<typename _Val> |
| 1014 | using wistream_view = basic_istream_view<_Val, wchar_t>; |
| 1015 | |
| 1016 | namespace views |
| 1017 | { |
| 1018 | namespace __detail |
| 1019 | { |
| 1020 | template<typename _Tp, typename _Up> |
| 1021 | concept __can_istream_view = requires (_Up __e) { |
| 1022 | basic_istream_view<_Tp, typename _Up::char_type, typename _Up::traits_type>(__e); |
| 1023 | }; |
| 1024 | } // namespace __detail |
| 1025 | |
| 1026 | template<typename _Tp> |
| 1027 | struct _Istream |
| 1028 | { |
| 1029 | template<typename _CharT, typename _Traits> |
| 1030 | constexpr auto |
| 1031 | operator() [[nodiscard]] (basic_istream<_CharT, _Traits>& __e) const |
| 1032 | requires __detail::__can_istream_view<_Tp, remove_reference_t<decltype(__e)>> |
| 1033 | { return basic_istream_view<_Tp, _CharT, _Traits>(__e); } |
| 1034 | }; |
| 1035 | |
| 1036 | template<typename _Tp> |
| 1037 | inline constexpr _Istream<_Tp> istream; |
| 1038 | } |
| 1039 | #endif // HOSTED |
| 1040 | |
| 1041 | // C++20 24.7 [range.adaptors] Range adaptors |
| 1042 | |
| 1043 | namespace __detail |
| 1044 | { |
| 1045 | template<typename _Tp, int _Disc> |
| 1046 | struct _Absent { }; |
| 1047 | |
| 1048 | // Alias for a type that is conditionally present |
| 1049 | // (and is an empty type otherwise). |
| 1050 | // Data members using this alias should use [[no_unique_address]] so that |
| 1051 | // they take no space when not needed. |
| 1052 | // The optional template parameter _Disc is for discriminating two otherwise |
| 1053 | // equivalent absent types so that even they can overlap. |
| 1054 | template<bool _Present, typename _Tp, int _Disc = 0> |
| 1055 | using __maybe_present_t = __conditional_t<_Present, _Tp, _Absent<_Tp, _Disc>>; |
| 1056 | |
| 1057 | // Alias for a type that is conditionally const. |
| 1058 | template<bool _Const, typename _Tp> |
| 1059 | using __maybe_const_t = __conditional_t<_Const, const _Tp, _Tp>; |
| 1060 | |
| 1061 | } // namespace __detail |
| 1062 | |
| 1063 | // Shorthand for __detail::__maybe_const_t. |
| 1064 | using __detail::__maybe_const_t; |
| 1065 | |
| 1066 | namespace views::__adaptor |
| 1067 | { |
| 1068 | // True if the range adaptor _Adaptor can be applied with _Args. |
| 1069 | template<typename _Adaptor, typename... _Args> |
| 1070 | concept __adaptor_invocable |
| 1071 | = requires { std::declval<_Adaptor>()(declval<_Args>()...); }; |
| 1072 | |
| 1073 | // True if the range adaptor non-closure _Adaptor can be partially applied |
| 1074 | // with _Args. |
| 1075 | template<typename _Adaptor, typename... _Args> |
| 1076 | concept __adaptor_partial_app_viable = (_Adaptor::_S_arity > 1) |
| 1077 | && (sizeof...(_Args) == _Adaptor::_S_arity - 1) |
| 1078 | && (constructible_from<decay_t<_Args>, _Args> && ...); |
| 1079 | |
| 1080 | template<typename _Adaptor, typename... _Args> |
| 1081 | struct _Partial; |
| 1082 | |
| 1083 | template<typename _Lhs, typename _Rhs> |
| 1084 | struct _Pipe; |
| 1085 | |
| 1086 | // The base class of every range adaptor closure. |
| 1087 | // |
| 1088 | // The derived class should define the optional static data member |
| 1089 | // _S_has_simple_call_op to true if the behavior of this adaptor is |
| 1090 | // independent of the constness/value category of the adaptor object. |
| 1091 | template<typename _Derived> |
| 1092 | struct _RangeAdaptorClosure; |
| 1093 | |
| 1094 | template<typename _Tp, typename _Up> |
| 1095 | requires (!same_as<_Tp, _RangeAdaptorClosure<_Up>>) |
| 1096 | void __is_range_adaptor_closure_fn |
| 1097 | (const _Tp&, const _RangeAdaptorClosure<_Up>&); // not defined |
| 1098 | |
| 1099 | template<typename _Tp> |
| 1100 | concept __is_range_adaptor_closure |
| 1101 | = requires (_Tp __t) { __adaptor::__is_range_adaptor_closure_fn(__t, __t); }; |
| 1102 | |
| 1103 | #pragma GCC diagnostic push |
| 1104 | #pragma GCC diagnostic ignored "-Wdangling-reference" |
| 1105 | // range | adaptor is equivalent to adaptor(range). |
| 1106 | template<typename _Self, typename _Range> |
| 1107 | requires __is_range_adaptor_closure<_Self> |
| 1108 | && __adaptor_invocable<_Self, _Range> |
| 1109 | constexpr auto |
| 1110 | operator|(_Range&& __r, _Self&& __self) |
| 1111 | { return std::forward<_Self>(__self)(std::forward<_Range>(__r)); } |
| 1112 | |
| 1113 | // Compose the adaptors __lhs and __rhs into a pipeline, returning |
| 1114 | // another range adaptor closure object. |
| 1115 | template<typename _Lhs, typename _Rhs> |
| 1116 | requires __is_range_adaptor_closure<_Lhs> |
| 1117 | && __is_range_adaptor_closure<_Rhs> |
| 1118 | constexpr auto |
| 1119 | operator|(_Lhs&& __lhs, _Rhs&& __rhs) |
| 1120 | { |
| 1121 | return _Pipe<decay_t<_Lhs>, decay_t<_Rhs>>{std::forward<_Lhs>(__lhs), |
| 1122 | std::forward<_Rhs>(__rhs)}; |
| 1123 | } |
| 1124 | #pragma GCC diagnostic pop |
| 1125 | |
| 1126 | template<typename _Derived> |
| 1127 | struct _RangeAdaptorClosure |
| 1128 | { |
| 1129 | // In non-modules compilation ADL finds these operators either way and |
| 1130 | // the friend declarations are redundant. But with the std module these |
| 1131 | // friend declarations enable ADL to find these operators without having |
| 1132 | // to export them. |
| 1133 | template<typename _Self, typename _Range> |
| 1134 | requires __is_range_adaptor_closure<_Self> |
| 1135 | && __adaptor_invocable<_Self, _Range> |
| 1136 | friend constexpr auto |
| 1137 | operator|(_Range&& __r, _Self&& __self); |
| 1138 | |
| 1139 | template<typename _Lhs, typename _Rhs> |
| 1140 | requires __is_range_adaptor_closure<_Lhs> |
| 1141 | && __is_range_adaptor_closure<_Rhs> |
| 1142 | friend constexpr auto |
| 1143 | operator|(_Lhs&& __lhs, _Rhs&& __rhs); |
| 1144 | }; |
| 1145 | |
| 1146 | // The base class of every range adaptor non-closure. |
| 1147 | // |
| 1148 | // The static data member _Derived::_S_arity must contain the total number of |
| 1149 | // arguments that the adaptor takes, and the class _Derived must introduce |
| 1150 | // _RangeAdaptor::operator() into the class scope via a using-declaration. |
| 1151 | // |
| 1152 | // The optional static data member _Derived::_S_has_simple_extra_args should |
| 1153 | // be defined to true if the behavior of this adaptor is independent of the |
| 1154 | // constness/value category of the extra arguments. This data member could |
| 1155 | // also be defined as a variable template parameterized by the types of the |
| 1156 | // extra arguments. |
| 1157 | template<typename _Derived> |
| 1158 | struct _RangeAdaptor |
| 1159 | { |
| 1160 | // Partially apply the arguments __args to the range adaptor _Derived, |
| 1161 | // returning a range adaptor closure object. |
| 1162 | template<typename... _Args> |
| 1163 | requires __adaptor_partial_app_viable<_Derived, _Args...> |
| 1164 | constexpr auto |
| 1165 | operator()(_Args&&... __args) const |
| 1166 | { |
| 1167 | return _Partial<_Derived, decay_t<_Args>...>{0, std::forward<_Args>(__args)...}; |
| 1168 | } |
| 1169 | }; |
| 1170 | |
| 1171 | // True if the range adaptor closure _Adaptor has a simple operator(), i.e. |
| 1172 | // one that's not overloaded according to constness or value category of the |
| 1173 | // _Adaptor object. |
| 1174 | template<typename _Adaptor> |
| 1175 | concept __closure_has_simple_call_op = _Adaptor::_S_has_simple_call_op; |
| 1176 | |
| 1177 | // True if the behavior of the range adaptor non-closure _Adaptor is |
| 1178 | // independent of the value category of its extra arguments _Args. |
| 1179 | template<typename _Adaptor, typename... _Args> |
| 1180 | concept __adaptor_has_simple_extra_args = _Adaptor::_S_has_simple_extra_args |
| 1181 | || _Adaptor::template _S_has_simple_extra_args<_Args...>; |
| 1182 | |
| 1183 | // A range adaptor closure that represents partial application of |
| 1184 | // the range adaptor _Adaptor with arguments _Args. |
| 1185 | template<typename _Adaptor, typename... _Args> |
| 1186 | struct _Partial : _RangeAdaptorClosure<_Partial<_Adaptor, _Args...>> |
| 1187 | { |
| 1188 | using _Binder = _Bind_back_t<_Adaptor, _Args...>; |
| 1189 | [[no_unique_address]] _Binder _M_binder; |
| 1190 | |
| 1191 | // First parameter is to ensure this constructor is never used |
| 1192 | // instead of the copy/move constructor. |
| 1193 | template<typename... _Ts> |
| 1194 | constexpr |
| 1195 | _Partial(int, _Ts&&... __args) |
| 1196 | : _M_binder(0, _Adaptor(), std::forward<_Ts>(__args)...) |
| 1197 | { } |
| 1198 | |
| 1199 | // Invoke _Adaptor with arguments __r, _M_args... according to the |
| 1200 | // value category of this _Partial object. |
| 1201 | #if _GLIBCXX_EXPLICIT_THIS_PARAMETER |
| 1202 | # pragma GCC diagnostic push |
| 1203 | # pragma GCC diagnostic ignored "-Wc++23-extensions" // deducing this |
| 1204 | template<typename _Self, typename _Range> |
| 1205 | requires __adaptor_invocable<_Adaptor, _Range, __like_t<_Self, _Args>...> |
| 1206 | constexpr auto |
| 1207 | operator()(this _Self&& __self, _Range&& __r) |
| 1208 | { |
| 1209 | return _Binder::_S_call(__like_t<_Self, _Partial>(__self)._M_binder, |
| 1210 | std::forward<_Range>(__r)); |
| 1211 | } |
| 1212 | # pragma GCC diagnostic pop |
| 1213 | #else |
| 1214 | template<typename _Range> |
| 1215 | requires __adaptor_invocable<_Adaptor, _Range, const _Args&...> |
| 1216 | constexpr auto |
| 1217 | operator()(_Range&& __r) const & |
| 1218 | { return _Binder::_S_call(_M_binder, std::forward<_Range>(__r)); } |
| 1219 | |
| 1220 | template<typename _Range> |
| 1221 | requires __adaptor_invocable<_Adaptor, _Range, _Args...> |
| 1222 | constexpr auto |
| 1223 | operator()(_Range&& __r) && |
| 1224 | { return _Binder::_S_call(std::move(_M_binder), std::forward<_Range>(__r)); } |
| 1225 | |
| 1226 | template<typename _Range> |
| 1227 | constexpr auto |
| 1228 | operator()(_Range&& __r) const && = delete; |
| 1229 | #endif |
| 1230 | }; |
| 1231 | |
| 1232 | // Partial specialization of the primary template for the case where the extra |
| 1233 | // arguments of the adaptor can always be safely and efficiently forwarded by |
| 1234 | // const reference. This lets us get away with a single operator() overload, |
| 1235 | // which makes overload resolution failure diagnostics more concise. |
| 1236 | template<typename _Adaptor, typename... _Args> |
| 1237 | requires __adaptor_has_simple_extra_args<_Adaptor, _Args...> |
| 1238 | && (is_trivially_copy_constructible_v<_Args> && ...) |
| 1239 | struct _Partial<_Adaptor, _Args...> : _RangeAdaptorClosure<_Partial<_Adaptor, _Args...>> |
| 1240 | { |
| 1241 | using _Binder = _Bind_back_t<_Adaptor, _Args...>; |
| 1242 | [[no_unique_address]] _Binder _M_binder; |
| 1243 | |
| 1244 | template<typename... _Ts> |
| 1245 | constexpr |
| 1246 | _Partial(int, _Ts&&... __args) |
| 1247 | : _M_binder(0, _Adaptor(), std::forward<_Ts>(__args)...) |
| 1248 | { } |
| 1249 | |
| 1250 | // Invoke _Adaptor with arguments __r, const _M_args&... regardless |
| 1251 | // of the value category of this _Partial object. |
| 1252 | template<typename _Range> |
| 1253 | requires __adaptor_invocable<_Adaptor, _Range, const _Args&...> |
| 1254 | constexpr auto |
| 1255 | operator()(_Range&& __r) const |
| 1256 | { return _Binder::_S_call(_M_binder, std::forward<_Range>(__r)); } |
| 1257 | |
| 1258 | static constexpr bool _S_has_simple_call_op = true; |
| 1259 | }; |
| 1260 | |
| 1261 | template<typename _Lhs, typename _Rhs, typename _Range> |
| 1262 | concept __pipe_invocable |
| 1263 | = requires { std::declval<_Rhs>()(std::declval<_Lhs>()(std::declval<_Range>())); }; |
| 1264 | |
| 1265 | // A range adaptor closure that represents composition of the range |
| 1266 | // adaptor closures _Lhs and _Rhs. |
| 1267 | template<typename _Lhs, typename _Rhs> |
| 1268 | struct _Pipe : _RangeAdaptorClosure<_Pipe<_Lhs, _Rhs>> |
| 1269 | { |
| 1270 | [[no_unique_address]] _Lhs _M_lhs; |
| 1271 | [[no_unique_address]] _Rhs _M_rhs; |
| 1272 | |
| 1273 | template<typename _Tp, typename _Up> |
| 1274 | constexpr |
| 1275 | _Pipe(_Tp&& __lhs, _Up&& __rhs) |
| 1276 | : _M_lhs(std::forward<_Tp>(__lhs)), _M_rhs(std::forward<_Up>(__rhs)) |
| 1277 | { } |
| 1278 | |
| 1279 | // Invoke _M_rhs(_M_lhs(__r)) according to the value category of this |
| 1280 | // range adaptor closure object. |
| 1281 | #if _GLIBCXX_EXPLICIT_THIS_PARAMETER |
| 1282 | # pragma GCC diagnostic push |
| 1283 | # pragma GCC diagnostic ignored "-Wc++23-extensions" // deducing this |
| 1284 | template<typename _Self, typename _Range> |
| 1285 | requires __pipe_invocable<__like_t<_Self, _Lhs>, __like_t<_Self, _Rhs>, _Range> |
| 1286 | constexpr auto |
| 1287 | operator()(this _Self&& __self, _Range&& __r) |
| 1288 | { |
| 1289 | return (__like_t<_Self, _Pipe>(__self)._M_rhs |
| 1290 | (__like_t<_Self, _Pipe>(__self)._M_lhs |
| 1291 | (std::forward<_Range>(__r)))); |
| 1292 | } |
| 1293 | # pragma GCC diagnostic pop |
| 1294 | #else |
| 1295 | template<typename _Range> |
| 1296 | requires __pipe_invocable<const _Lhs&, const _Rhs&, _Range> |
| 1297 | constexpr auto |
| 1298 | operator()(_Range&& __r) const & |
| 1299 | { return _M_rhs(_M_lhs(std::forward<_Range>(__r))); } |
| 1300 | |
| 1301 | template<typename _Range> |
| 1302 | requires __pipe_invocable<_Lhs, _Rhs, _Range> |
| 1303 | constexpr auto |
| 1304 | operator()(_Range&& __r) && |
| 1305 | { return std::move(_M_rhs)(std::move(_M_lhs)(std::forward<_Range>(__r))); } |
| 1306 | |
| 1307 | template<typename _Range> |
| 1308 | constexpr auto |
| 1309 | operator()(_Range&& __r) const && = delete; |
| 1310 | #endif |
| 1311 | }; |
| 1312 | |
| 1313 | // A partial specialization of the above primary template for the case where |
| 1314 | // both adaptor operands have a simple operator(). This in turn lets us |
| 1315 | // implement composition using a single simple operator(), which makes |
| 1316 | // overload resolution failure diagnostics more concise. |
| 1317 | template<typename _Lhs, typename _Rhs> |
| 1318 | requires __closure_has_simple_call_op<_Lhs> |
| 1319 | && __closure_has_simple_call_op<_Rhs> |
| 1320 | struct _Pipe<_Lhs, _Rhs> : _RangeAdaptorClosure<_Pipe<_Lhs, _Rhs>> |
| 1321 | { |
| 1322 | [[no_unique_address]] _Lhs _M_lhs; |
| 1323 | [[no_unique_address]] _Rhs _M_rhs; |
| 1324 | |
| 1325 | template<typename _Tp, typename _Up> |
| 1326 | constexpr |
| 1327 | _Pipe(_Tp&& __lhs, _Up&& __rhs) |
| 1328 | : _M_lhs(std::forward<_Tp>(__lhs)), _M_rhs(std::forward<_Up>(__rhs)) |
| 1329 | { } |
| 1330 | |
| 1331 | template<typename _Range> |
| 1332 | requires __pipe_invocable<const _Lhs&, const _Rhs&, _Range> |
| 1333 | constexpr auto |
| 1334 | operator()(_Range&& __r) const |
| 1335 | { return _M_rhs(_M_lhs(std::forward<_Range>(__r))); } |
| 1336 | |
| 1337 | static constexpr bool _S_has_simple_call_op = true; |
| 1338 | }; |
| 1339 | } // namespace views::__adaptor |
| 1340 | |
| 1341 | #if __cpp_lib_ranges >= 202202L |
| 1342 | // P2387R3 Pipe support for user-defined range adaptors |
| 1343 | template<typename _Derived> |
| 1344 | requires is_class_v<_Derived> && same_as<_Derived, remove_cv_t<_Derived>> |
| 1345 | class range_adaptor_closure |
| 1346 | : public views::__adaptor::_RangeAdaptorClosure<_Derived> |
| 1347 | { }; |
| 1348 | #endif |
| 1349 | |
| 1350 | template<range _Range> requires is_object_v<_Range> |
| 1351 | class ref_view : public view_interface<ref_view<_Range>> |
| 1352 | { |
| 1353 | private: |
| 1354 | _Range* _M_r; |
| 1355 | |
| 1356 | static void _S_fun(_Range&); // not defined |
| 1357 | static void _S_fun(_Range&&) = delete; |
| 1358 | |
| 1359 | public: |
| 1360 | template<__detail::__different_from<ref_view> _Tp> |
| 1361 | requires convertible_to<_Tp, _Range&> |
| 1362 | && requires { _S_fun(declval<_Tp>()); } |
| 1363 | constexpr |
| 1364 | ref_view(_Tp&& __t) |
| 1365 | noexcept(noexcept(static_cast<_Range&>(std::declval<_Tp>()))) |
| 1366 | : _M_r(std::__addressof(static_cast<_Range&>(std::forward<_Tp>(__t)))) |
| 1367 | { } |
| 1368 | |
| 1369 | constexpr _Range& |
| 1370 | base() const |
| 1371 | { return *_M_r; } |
| 1372 | |
| 1373 | constexpr iterator_t<_Range> |
| 1374 | begin() const |
| 1375 | { return ranges::begin(*_M_r); } |
| 1376 | |
| 1377 | constexpr sentinel_t<_Range> |
| 1378 | end() const |
| 1379 | { return ranges::end(*_M_r); } |
| 1380 | |
| 1381 | constexpr bool |
| 1382 | empty() const requires requires { ranges::empty(*_M_r); } |
| 1383 | { return ranges::empty(*_M_r); } |
| 1384 | |
| 1385 | constexpr auto |
| 1386 | size() const requires sized_range<_Range> |
| 1387 | { return ranges::size(*_M_r); } |
| 1388 | |
| 1389 | constexpr auto |
| 1390 | data() const requires contiguous_range<_Range> |
| 1391 | { return ranges::data(*_M_r); } |
| 1392 | }; |
| 1393 | |
| 1394 | template<typename _Range> |
| 1395 | ref_view(_Range&) -> ref_view<_Range>; |
| 1396 | |
| 1397 | template<typename _Tp> |
| 1398 | inline constexpr bool enable_borrowed_range<ref_view<_Tp>> = true; |
| 1399 | |
| 1400 | template<range _Range> |
| 1401 | requires movable<_Range> |
| 1402 | && (!__detail::__is_initializer_list<remove_cv_t<_Range>>) |
| 1403 | class owning_view : public view_interface<owning_view<_Range>> |
| 1404 | { |
| 1405 | private: |
| 1406 | _Range _M_r = _Range(); |
| 1407 | |
| 1408 | public: |
| 1409 | owning_view() requires default_initializable<_Range> = default; |
| 1410 | |
| 1411 | constexpr |
| 1412 | owning_view(_Range&& __t) |
| 1413 | noexcept(is_nothrow_move_constructible_v<_Range>) |
| 1414 | : _M_r(std::move(__t)) |
| 1415 | { } |
| 1416 | |
| 1417 | owning_view(owning_view&&) = default; |
| 1418 | owning_view& operator=(owning_view&&) = default; |
| 1419 | |
| 1420 | constexpr _Range& |
| 1421 | base() & noexcept |
| 1422 | { return _M_r; } |
| 1423 | |
| 1424 | constexpr const _Range& |
| 1425 | base() const& noexcept |
| 1426 | { return _M_r; } |
| 1427 | |
| 1428 | constexpr _Range&& |
| 1429 | base() && noexcept |
| 1430 | { return std::move(_M_r); } |
| 1431 | |
| 1432 | constexpr const _Range&& |
| 1433 | base() const&& noexcept |
| 1434 | { return std::move(_M_r); } |
| 1435 | |
| 1436 | constexpr iterator_t<_Range> |
| 1437 | begin() |
| 1438 | { return ranges::begin(_M_r); } |
| 1439 | |
| 1440 | constexpr sentinel_t<_Range> |
| 1441 | end() |
| 1442 | { return ranges::end(_M_r); } |
| 1443 | |
| 1444 | constexpr auto |
| 1445 | begin() const requires range<const _Range> |
| 1446 | { return ranges::begin(_M_r); } |
| 1447 | |
| 1448 | constexpr auto |
| 1449 | end() const requires range<const _Range> |
| 1450 | { return ranges::end(_M_r); } |
| 1451 | |
| 1452 | constexpr bool |
| 1453 | empty() requires requires { ranges::empty(_M_r); } |
| 1454 | { return ranges::empty(_M_r); } |
| 1455 | |
| 1456 | constexpr bool |
| 1457 | empty() const requires requires { ranges::empty(_M_r); } |
| 1458 | { return ranges::empty(_M_r); } |
| 1459 | |
| 1460 | constexpr auto |
| 1461 | size() requires sized_range<_Range> |
| 1462 | { return ranges::size(_M_r); } |
| 1463 | |
| 1464 | constexpr auto |
| 1465 | size() const requires sized_range<const _Range> |
| 1466 | { return ranges::size(_M_r); } |
| 1467 | |
| 1468 | constexpr auto |
| 1469 | data() requires contiguous_range<_Range> |
| 1470 | { return ranges::data(_M_r); } |
| 1471 | |
| 1472 | constexpr auto |
| 1473 | data() const requires contiguous_range<const _Range> |
| 1474 | { return ranges::data(_M_r); } |
| 1475 | }; |
| 1476 | |
| 1477 | template<typename _Tp> |
| 1478 | inline constexpr bool enable_borrowed_range<owning_view<_Tp>> |
| 1479 | = enable_borrowed_range<_Tp>; |
| 1480 | |
| 1481 | namespace views |
| 1482 | { |
| 1483 | namespace __detail |
| 1484 | { |
| 1485 | template<typename _Range> |
| 1486 | concept __can_ref_view = requires { ref_view{std::declval<_Range>()}; }; |
| 1487 | |
| 1488 | template<typename _Range> |
| 1489 | concept __can_owning_view = requires { owning_view{std::declval<_Range>()}; }; |
| 1490 | } // namespace __detail |
| 1491 | |
| 1492 | struct _All : __adaptor::_RangeAdaptorClosure<_All> |
| 1493 | { |
| 1494 | template<typename _Range> |
| 1495 | static constexpr bool |
| 1496 | _S_noexcept() |
| 1497 | { |
| 1498 | if constexpr (view<decay_t<_Range>>) |
| 1499 | return is_nothrow_constructible_v<decay_t<_Range>, _Range>; |
| 1500 | else if constexpr (__detail::__can_ref_view<_Range>) |
| 1501 | return true; |
| 1502 | else |
| 1503 | return noexcept(owning_view{std::declval<_Range>()}); |
| 1504 | } |
| 1505 | |
| 1506 | template<viewable_range _Range> |
| 1507 | requires view<decay_t<_Range>> |
| 1508 | || __detail::__can_ref_view<_Range> |
| 1509 | || __detail::__can_owning_view<_Range> |
| 1510 | constexpr auto |
| 1511 | operator() [[nodiscard]] (_Range&& __r) const |
| 1512 | noexcept(_S_noexcept<_Range>()) |
| 1513 | { |
| 1514 | if constexpr (view<decay_t<_Range>>) |
| 1515 | return std::forward<_Range>(__r); |
| 1516 | else if constexpr (__detail::__can_ref_view<_Range>) |
| 1517 | return ref_view{std::forward<_Range>(__r)}; |
| 1518 | else |
| 1519 | return owning_view{std::forward<_Range>(__r)}; |
| 1520 | } |
| 1521 | |
| 1522 | static constexpr bool _S_has_simple_call_op = true; |
| 1523 | }; |
| 1524 | |
| 1525 | inline constexpr _All all; |
| 1526 | |
| 1527 | template<viewable_range _Range> |
| 1528 | using all_t = decltype(all(std::declval<_Range>())); |
| 1529 | } // namespace views |
| 1530 | |
| 1531 | namespace __detail |
| 1532 | { |
| 1533 | template<typename _Tp> |
| 1534 | struct __non_propagating_cache |
| 1535 | { |
| 1536 | // When _Tp is not an object type (e.g. is a reference type), we make |
| 1537 | // __non_propagating_cache<_Tp> empty rather than ill-formed so that |
| 1538 | // users can easily conditionally declare data members with this type |
| 1539 | // (such as join_view::_M_inner). |
| 1540 | }; |
| 1541 | |
| 1542 | template<typename _Tp> |
| 1543 | requires is_object_v<_Tp> |
| 1544 | struct __non_propagating_cache<_Tp> |
| 1545 | : protected _Optional_base<_Tp> |
| 1546 | { |
| 1547 | __non_propagating_cache() = default; |
| 1548 | |
| 1549 | constexpr |
| 1550 | __non_propagating_cache(const __non_propagating_cache&) noexcept |
| 1551 | { } |
| 1552 | |
| 1553 | constexpr |
| 1554 | __non_propagating_cache(__non_propagating_cache&& __other) noexcept |
| 1555 | { __other._M_reset(); } |
| 1556 | |
| 1557 | constexpr __non_propagating_cache& |
| 1558 | operator=(const __non_propagating_cache& __other) noexcept |
| 1559 | { |
| 1560 | if (std::__addressof(__other) != this) |
| 1561 | this->_M_reset(); |
| 1562 | return *this; |
| 1563 | } |
| 1564 | |
| 1565 | constexpr __non_propagating_cache& |
| 1566 | operator=(__non_propagating_cache&& __other) noexcept |
| 1567 | { |
| 1568 | this->_M_reset(); |
| 1569 | __other._M_reset(); |
| 1570 | return *this; |
| 1571 | } |
| 1572 | |
| 1573 | constexpr __non_propagating_cache& |
| 1574 | operator=(_Tp __val) |
| 1575 | { |
| 1576 | this->_M_reset(); |
| 1577 | this->_M_payload._M_construct(std::move(__val)); |
| 1578 | return *this; |
| 1579 | } |
| 1580 | |
| 1581 | constexpr explicit |
| 1582 | operator bool() const noexcept |
| 1583 | { return this->_M_is_engaged(); } |
| 1584 | |
| 1585 | constexpr _Tp& |
| 1586 | operator*() noexcept |
| 1587 | { return this->_M_get(); } |
| 1588 | |
| 1589 | constexpr const _Tp& |
| 1590 | operator*() const noexcept |
| 1591 | { return this->_M_get(); } |
| 1592 | |
| 1593 | template<typename _Iter> |
| 1594 | constexpr _Tp& |
| 1595 | _M_emplace_deref(const _Iter& __i) |
| 1596 | { |
| 1597 | this->_M_reset(); |
| 1598 | auto __f = [] (auto& __x) { return *__x; }; |
| 1599 | this->_M_payload._M_apply(_Optional_func{__f}, __i); |
| 1600 | return this->_M_get(); |
| 1601 | } |
| 1602 | |
| 1603 | using _Optional_base<_Tp>::_M_reset; |
| 1604 | }; |
| 1605 | |
| 1606 | template<range _Range> |
| 1607 | struct _CachedPosition |
| 1608 | { |
| 1609 | constexpr bool |
| 1610 | _M_has_value() const |
| 1611 | { return false; } |
| 1612 | |
| 1613 | constexpr iterator_t<_Range> |
| 1614 | _M_get(const _Range&) const |
| 1615 | { |
| 1616 | __glibcxx_assert(false); |
| 1617 | __builtin_unreachable(); |
| 1618 | } |
| 1619 | |
| 1620 | constexpr void |
| 1621 | _M_set(const _Range&, const iterator_t<_Range>&) const |
| 1622 | { } |
| 1623 | }; |
| 1624 | |
| 1625 | template<forward_range _Range> |
| 1626 | struct _CachedPosition<_Range> |
| 1627 | : protected __non_propagating_cache<iterator_t<_Range>> |
| 1628 | { |
| 1629 | constexpr bool |
| 1630 | _M_has_value() const |
| 1631 | { return this->_M_is_engaged(); } |
| 1632 | |
| 1633 | constexpr iterator_t<_Range> |
| 1634 | _M_get(const _Range&) const |
| 1635 | { |
| 1636 | __glibcxx_assert(_M_has_value()); |
| 1637 | return **this; |
| 1638 | } |
| 1639 | |
| 1640 | constexpr void |
| 1641 | _M_set(const _Range&, const iterator_t<_Range>& __it) |
| 1642 | { |
| 1643 | __glibcxx_assert(!_M_has_value()); |
| 1644 | std::construct_at(std::__addressof(this->_M_payload._M_payload), |
| 1645 | in_place, __it); |
| 1646 | this->_M_payload._M_engaged = true; |
| 1647 | } |
| 1648 | }; |
| 1649 | |
| 1650 | template<random_access_range _Range> |
| 1651 | struct _CachedPosition<_Range> |
| 1652 | { |
| 1653 | private: |
| 1654 | range_difference_t<_Range> _M_offset = -1; |
| 1655 | |
| 1656 | public: |
| 1657 | _CachedPosition() = default; |
| 1658 | |
| 1659 | constexpr |
| 1660 | _CachedPosition(const _CachedPosition&) = default; |
| 1661 | |
| 1662 | constexpr |
| 1663 | _CachedPosition(_CachedPosition&& __other) noexcept |
| 1664 | { *this = std::move(__other); } |
| 1665 | |
| 1666 | constexpr _CachedPosition& |
| 1667 | operator=(const _CachedPosition&) = default; |
| 1668 | |
| 1669 | constexpr _CachedPosition& |
| 1670 | operator=(_CachedPosition&& __other) noexcept |
| 1671 | { |
| 1672 | // Propagate the cached offset, but invalidate the source. |
| 1673 | _M_offset = __other._M_offset; |
| 1674 | __other._M_offset = -1; |
| 1675 | return *this; |
| 1676 | } |
| 1677 | |
| 1678 | constexpr bool |
| 1679 | _M_has_value() const |
| 1680 | { return _M_offset >= 0; } |
| 1681 | |
| 1682 | constexpr iterator_t<_Range> |
| 1683 | _M_get(_Range& __r) const |
| 1684 | { |
| 1685 | __glibcxx_assert(_M_has_value()); |
| 1686 | return ranges::begin(__r) + _M_offset; |
| 1687 | } |
| 1688 | |
| 1689 | constexpr void |
| 1690 | _M_set(_Range& __r, const iterator_t<_Range>& __it) |
| 1691 | { |
| 1692 | __glibcxx_assert(!_M_has_value()); |
| 1693 | _M_offset = __it - ranges::begin(__r); |
| 1694 | } |
| 1695 | }; |
| 1696 | } // namespace __detail |
| 1697 | |
| 1698 | namespace __detail |
| 1699 | { |
| 1700 | template<typename _Base> |
| 1701 | struct __filter_view_iter_cat |
| 1702 | { }; |
| 1703 | |
| 1704 | template<forward_range _Base> |
| 1705 | struct __filter_view_iter_cat<_Base> |
| 1706 | { |
| 1707 | private: |
| 1708 | static auto |
| 1709 | _S_iter_cat() |
| 1710 | { |
| 1711 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 1712 | if constexpr (derived_from<_Cat, bidirectional_iterator_tag>) |
| 1713 | return bidirectional_iterator_tag{}; |
| 1714 | else if constexpr (derived_from<_Cat, forward_iterator_tag>) |
| 1715 | return forward_iterator_tag{}; |
| 1716 | else |
| 1717 | return _Cat{}; |
| 1718 | } |
| 1719 | public: |
| 1720 | using iterator_category = decltype(_S_iter_cat()); |
| 1721 | }; |
| 1722 | } // namespace __detail |
| 1723 | |
| 1724 | template<input_range _Vp, |
| 1725 | indirect_unary_predicate<iterator_t<_Vp>> _Pred> |
| 1726 | requires view<_Vp> && is_object_v<_Pred> |
| 1727 | class filter_view : public view_interface<filter_view<_Vp, _Pred>> |
| 1728 | { |
| 1729 | private: |
| 1730 | template<bool _Const> |
| 1731 | struct _Sentinel; |
| 1732 | |
| 1733 | template<bool _Const> |
| 1734 | struct _Iterator : __detail::__filter_view_iter_cat<_Vp> |
| 1735 | { |
| 1736 | private: |
| 1737 | static constexpr auto |
| 1738 | _S_iter_concept() |
| 1739 | { |
| 1740 | if constexpr (_Const) |
| 1741 | return input_iterator_tag{}; |
| 1742 | else if constexpr (bidirectional_range<_Vp>) |
| 1743 | return bidirectional_iterator_tag{}; |
| 1744 | else if constexpr (forward_range<_Vp>) |
| 1745 | return forward_iterator_tag{}; |
| 1746 | else |
| 1747 | return input_iterator_tag{}; |
| 1748 | } |
| 1749 | |
| 1750 | friend filter_view; |
| 1751 | friend _Iterator<!_Const>; |
| 1752 | |
| 1753 | using _Parent = __maybe_const_t<_Const, filter_view>; |
| 1754 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 1755 | using _Base_iter = iterator_t<_Base>; |
| 1756 | |
| 1757 | _Base_iter _M_current = _Base_iter(); |
| 1758 | _Parent* _M_parent = nullptr; |
| 1759 | |
| 1760 | public: |
| 1761 | using iterator_concept = decltype(_S_iter_concept()); |
| 1762 | // iterator_category defined in __filter_view_iter_cat |
| 1763 | using value_type = range_value_t<_Base>; |
| 1764 | using difference_type = range_difference_t<_Base>; |
| 1765 | |
| 1766 | _Iterator() requires default_initializable<_Base_iter> = default; |
| 1767 | |
| 1768 | constexpr |
| 1769 | _Iterator(_Parent* __parent, _Base_iter __current) |
| 1770 | : _M_current(std::move(__current)), |
| 1771 | _M_parent(__parent) |
| 1772 | { } |
| 1773 | |
| 1774 | constexpr |
| 1775 | _Iterator(_Iterator<!_Const> __i) |
| 1776 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 1777 | : _M_current(std::move(__i._M_current)), |
| 1778 | _M_parent(std::move(__i._M_parent)) |
| 1779 | { } |
| 1780 | |
| 1781 | constexpr const _Base_iter& |
| 1782 | base() const & noexcept |
| 1783 | { return _M_current; } |
| 1784 | |
| 1785 | constexpr _Base_iter |
| 1786 | base() && |
| 1787 | { return std::move(_M_current); } |
| 1788 | |
| 1789 | constexpr range_reference_t<_Base> |
| 1790 | operator*() const |
| 1791 | { return *_M_current; } |
| 1792 | |
| 1793 | constexpr _Base_iter |
| 1794 | operator->() const |
| 1795 | requires __detail::__has_arrow<_Base_iter> |
| 1796 | && copyable<_Base_iter> |
| 1797 | { return _M_current; } |
| 1798 | |
| 1799 | constexpr _Iterator& |
| 1800 | operator++() |
| 1801 | { |
| 1802 | _M_current = ranges::find_if(std::move(++_M_current), |
| 1803 | ranges::end(_M_parent->_M_base), |
| 1804 | std::ref(*_M_parent->_M_pred)); |
| 1805 | return *this; |
| 1806 | } |
| 1807 | |
| 1808 | constexpr void |
| 1809 | operator++(int) |
| 1810 | { ++*this; } |
| 1811 | |
| 1812 | constexpr _Iterator |
| 1813 | operator++(int) requires forward_range<_Base> |
| 1814 | { |
| 1815 | auto __tmp = *this; |
| 1816 | ++*this; |
| 1817 | return __tmp; |
| 1818 | } |
| 1819 | |
| 1820 | constexpr _Iterator& |
| 1821 | operator--() requires bidirectional_range<_Base> |
| 1822 | { |
| 1823 | do |
| 1824 | --_M_current; |
| 1825 | while (!std::__invoke(*_M_parent->_M_pred, *_M_current)); |
| 1826 | return *this; |
| 1827 | } |
| 1828 | |
| 1829 | constexpr _Iterator |
| 1830 | operator--(int) requires bidirectional_range<_Base> |
| 1831 | { |
| 1832 | auto __tmp = *this; |
| 1833 | --*this; |
| 1834 | return __tmp; |
| 1835 | } |
| 1836 | |
| 1837 | friend constexpr bool |
| 1838 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 1839 | requires equality_comparable<_Base_iter> |
| 1840 | { return __x._M_current == __y._M_current; } |
| 1841 | |
| 1842 | friend constexpr range_rvalue_reference_t<_Base> |
| 1843 | iter_move(const _Iterator& __i) |
| 1844 | noexcept(noexcept(ranges::iter_move(__i._M_current))) |
| 1845 | { return ranges::iter_move(__i._M_current); } |
| 1846 | |
| 1847 | friend constexpr void |
| 1848 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 1849 | noexcept(noexcept(ranges::iter_swap(__x._M_current, __y._M_current))) |
| 1850 | requires indirectly_swappable<_Base_iter> |
| 1851 | { ranges::iter_swap(__x._M_current, __y._M_current); } |
| 1852 | }; |
| 1853 | |
| 1854 | template<bool _Const> |
| 1855 | struct _Sentinel |
| 1856 | { |
| 1857 | private: |
| 1858 | using _Parent = __maybe_const_t<_Const, filter_view>; |
| 1859 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 1860 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 1861 | |
| 1862 | friend _Sentinel<!_Const>; |
| 1863 | |
| 1864 | public: |
| 1865 | _Sentinel() = default; |
| 1866 | |
| 1867 | constexpr explicit |
| 1868 | _Sentinel(_Parent* __parent) |
| 1869 | : _M_end(ranges::end(__parent->_M_base)) |
| 1870 | { } |
| 1871 | |
| 1872 | constexpr |
| 1873 | _Sentinel(_Sentinel<!_Const> __i) |
| 1874 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 1875 | : _M_end(std::move(__i._M_end)) |
| 1876 | { } |
| 1877 | |
| 1878 | constexpr sentinel_t<_Base> |
| 1879 | base() const |
| 1880 | { return _M_end; } |
| 1881 | |
| 1882 | template<bool _Const2> |
| 1883 | requires sentinel_for<sentinel_t<_Base>, |
| 1884 | iterator_t<__maybe_const_t<_Const2, _Vp>>> |
| 1885 | friend constexpr bool |
| 1886 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 1887 | { return __x._M_current == __y._M_end; } |
| 1888 | }; |
| 1889 | |
| 1890 | _Vp _M_base = _Vp(); |
| 1891 | [[no_unique_address]] __detail::__box<_Pred> _M_pred; |
| 1892 | [[no_unique_address]] __detail::_CachedPosition<_Vp> _M_cached_begin; |
| 1893 | |
| 1894 | public: |
| 1895 | filter_view() requires (default_initializable<_Vp> |
| 1896 | && default_initializable<_Pred>) |
| 1897 | = default; |
| 1898 | |
| 1899 | constexpr explicit |
| 1900 | filter_view(_Vp __base, _Pred __pred) |
| 1901 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 1902 | { } |
| 1903 | |
| 1904 | constexpr _Vp |
| 1905 | base() const& requires copy_constructible<_Vp> |
| 1906 | { return _M_base; } |
| 1907 | |
| 1908 | constexpr _Vp |
| 1909 | base() && |
| 1910 | { return std::move(_M_base); } |
| 1911 | |
| 1912 | constexpr const _Pred& |
| 1913 | pred() const |
| 1914 | { return *_M_pred; } |
| 1915 | |
| 1916 | constexpr _Iterator<false> |
| 1917 | begin() |
| 1918 | { |
| 1919 | if (_M_cached_begin._M_has_value()) |
| 1920 | return {this, _M_cached_begin._M_get(_M_base)}; |
| 1921 | |
| 1922 | __glibcxx_assert(_M_pred.has_value()); |
| 1923 | auto __it = ranges::find_if(ranges::begin(_M_base), |
| 1924 | ranges::end(_M_base), |
| 1925 | std::ref(*_M_pred)); |
| 1926 | _M_cached_begin._M_set(_M_base, __it); |
| 1927 | return {this, std::move(__it)}; |
| 1928 | } |
| 1929 | |
| 1930 | constexpr _Iterator<true> |
| 1931 | begin() const |
| 1932 | requires (input_range<const _Vp> && !forward_range<const _Vp> |
| 1933 | && indirect_unary_predicate<const _Pred, iterator_t<const _Vp>>) |
| 1934 | { |
| 1935 | __glibcxx_assert(_M_pred.has_value()); |
| 1936 | auto __it = ranges::find_if(ranges::begin(_M_base), |
| 1937 | ranges::end(_M_base), |
| 1938 | std::ref(*_M_pred)); |
| 1939 | return {this, std::move(__it)}; |
| 1940 | } |
| 1941 | |
| 1942 | constexpr auto |
| 1943 | end() |
| 1944 | { |
| 1945 | if constexpr (common_range<_Vp>) |
| 1946 | return _Iterator<false>{this, ranges::end(_M_base)}; |
| 1947 | else |
| 1948 | return _Sentinel<false>{this}; |
| 1949 | } |
| 1950 | |
| 1951 | constexpr _Sentinel<true> |
| 1952 | end() const |
| 1953 | requires (input_range<const _Vp> && !forward_range<const _Vp> |
| 1954 | && indirect_unary_predicate<const _Pred, iterator_t<const _Vp>>) |
| 1955 | { return _Sentinel<true>{this}; } |
| 1956 | }; |
| 1957 | |
| 1958 | template<typename _Range, typename _Pred> |
| 1959 | filter_view(_Range&&, _Pred) -> filter_view<views::all_t<_Range>, _Pred>; |
| 1960 | |
| 1961 | namespace views |
| 1962 | { |
| 1963 | namespace __detail |
| 1964 | { |
| 1965 | template<typename _Range, typename _Pred> |
| 1966 | concept __can_filter_view |
| 1967 | = requires { filter_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 1968 | } // namespace __detail |
| 1969 | |
| 1970 | struct _Filter : __adaptor::_RangeAdaptor<_Filter> |
| 1971 | { |
| 1972 | template<viewable_range _Range, typename _Pred> |
| 1973 | requires __detail::__can_filter_view<_Range, _Pred> |
| 1974 | constexpr auto |
| 1975 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __p) const |
| 1976 | { |
| 1977 | return filter_view(std::forward<_Range>(__r), std::forward<_Pred>(__p)); |
| 1978 | } |
| 1979 | |
| 1980 | using _RangeAdaptor<_Filter>::operator(); |
| 1981 | static constexpr int _S_arity = 2; |
| 1982 | static constexpr bool _S_has_simple_extra_args = true; |
| 1983 | }; |
| 1984 | |
| 1985 | inline constexpr _Filter filter; |
| 1986 | } // namespace views |
| 1987 | |
| 1988 | #if __cpp_lib_ranges >= 202207L // C++ >= 23 |
| 1989 | template<input_range _Vp, move_constructible _Fp> |
| 1990 | #else |
| 1991 | template<input_range _Vp, copy_constructible _Fp> |
| 1992 | #endif |
| 1993 | requires view<_Vp> && is_object_v<_Fp> |
| 1994 | && regular_invocable<_Fp&, range_reference_t<_Vp>> |
| 1995 | && std::__detail::__can_reference<invoke_result_t<_Fp&, |
| 1996 | range_reference_t<_Vp>>> |
| 1997 | class transform_view : public view_interface<transform_view<_Vp, _Fp>> |
| 1998 | { |
| 1999 | private: |
| 2000 | template<bool _Const> |
| 2001 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 2002 | |
| 2003 | template<bool _Const> |
| 2004 | struct __iter_cat |
| 2005 | { }; |
| 2006 | |
| 2007 | template<bool _Const> |
| 2008 | requires forward_range<_Base<_Const>> |
| 2009 | struct __iter_cat<_Const> |
| 2010 | { |
| 2011 | private: |
| 2012 | static auto |
| 2013 | _S_iter_cat() |
| 2014 | { |
| 2015 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2016 | // 3564. transform_view::iterator<true>::value_type and |
| 2017 | // iterator_category should use const F& |
| 2018 | using _Base = transform_view::_Base<_Const>; |
| 2019 | using _Res = invoke_result_t<__maybe_const_t<_Const, _Fp>&, |
| 2020 | range_reference_t<_Base>>; |
| 2021 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2022 | // 3798. Rvalue reference and iterator_category |
| 2023 | if constexpr (is_reference_v<_Res>) |
| 2024 | { |
| 2025 | using _Cat |
| 2026 | = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 2027 | if constexpr (derived_from<_Cat, contiguous_iterator_tag>) |
| 2028 | return random_access_iterator_tag{}; |
| 2029 | else |
| 2030 | return _Cat{}; |
| 2031 | } |
| 2032 | else |
| 2033 | return input_iterator_tag{}; |
| 2034 | } |
| 2035 | public: |
| 2036 | using iterator_category = decltype(_S_iter_cat()); |
| 2037 | }; |
| 2038 | |
| 2039 | template<bool _Const> |
| 2040 | struct _Sentinel; |
| 2041 | |
| 2042 | template<bool _Const> |
| 2043 | struct _Iterator : __iter_cat<_Const> |
| 2044 | { |
| 2045 | private: |
| 2046 | using _Parent = __detail::__maybe_const_t<_Const, transform_view>; |
| 2047 | using _Base = transform_view::_Base<_Const>; |
| 2048 | using _Base_iter = iterator_t<_Base>; |
| 2049 | using _Func_handle = __detail::__func_handle_t< |
| 2050 | __detail::__maybe_const_t<_Const, _Fp>, |
| 2051 | _Base_iter>; |
| 2052 | |
| 2053 | static auto |
| 2054 | _S_iter_concept() |
| 2055 | { |
| 2056 | if constexpr (random_access_range<_Base>) |
| 2057 | return random_access_iterator_tag{}; |
| 2058 | else if constexpr (bidirectional_range<_Base>) |
| 2059 | return bidirectional_iterator_tag{}; |
| 2060 | else if constexpr (forward_range<_Base>) |
| 2061 | return forward_iterator_tag{}; |
| 2062 | else |
| 2063 | return input_iterator_tag{}; |
| 2064 | } |
| 2065 | |
| 2066 | _Base_iter _M_current = _Base_iter(); |
| 2067 | [[no_unique_address]] _Func_handle _M_fun; |
| 2068 | |
| 2069 | public: |
| 2070 | using iterator_concept = decltype(_S_iter_concept()); |
| 2071 | // iterator_category defined in __transform_view_iter_cat |
| 2072 | using value_type |
| 2073 | = remove_cvref_t<invoke_result_t<__maybe_const_t<_Const, _Fp>&, |
| 2074 | range_reference_t<_Base>>>; |
| 2075 | using difference_type = range_difference_t<_Base>; |
| 2076 | |
| 2077 | _Iterator() requires default_initializable<_Base_iter> = default; |
| 2078 | |
| 2079 | constexpr |
| 2080 | _Iterator(_Func_handle __fun, _Base_iter __current) |
| 2081 | : _M_current(std::move(__current)), _M_fun(__fun) |
| 2082 | { } |
| 2083 | |
| 2084 | constexpr |
| 2085 | _Iterator(_Parent* __parent, _Base_iter __current) |
| 2086 | : _M_current(std::move(__current)), _M_fun(*__parent->_M_fun) |
| 2087 | {} |
| 2088 | |
| 2089 | constexpr |
| 2090 | _Iterator(_Iterator<!_Const> __i) |
| 2091 | requires _Const |
| 2092 | && convertible_to<iterator_t<_Vp>, _Base_iter> |
| 2093 | : _M_current(std::move(__i._M_current)), _M_fun(__i._M_fun) |
| 2094 | { } |
| 2095 | |
| 2096 | constexpr const _Base_iter& |
| 2097 | base() const & noexcept |
| 2098 | { return _M_current; } |
| 2099 | |
| 2100 | constexpr _Base_iter |
| 2101 | base() && |
| 2102 | { return std::move(_M_current); } |
| 2103 | |
| 2104 | constexpr decltype(auto) |
| 2105 | operator*() const |
| 2106 | noexcept(noexcept(_M_fun._M_call_deref(_M_current))) |
| 2107 | { return _M_fun._M_call_deref(_M_current); } |
| 2108 | |
| 2109 | constexpr _Iterator& |
| 2110 | operator++() |
| 2111 | { |
| 2112 | ++_M_current; |
| 2113 | return *this; |
| 2114 | } |
| 2115 | |
| 2116 | constexpr void |
| 2117 | operator++(int) |
| 2118 | { ++_M_current; } |
| 2119 | |
| 2120 | constexpr _Iterator |
| 2121 | operator++(int) requires forward_range<_Base> |
| 2122 | { |
| 2123 | auto __tmp = *this; |
| 2124 | ++*this; |
| 2125 | return __tmp; |
| 2126 | } |
| 2127 | |
| 2128 | constexpr _Iterator& |
| 2129 | operator--() requires bidirectional_range<_Base> |
| 2130 | { |
| 2131 | --_M_current; |
| 2132 | return *this; |
| 2133 | } |
| 2134 | |
| 2135 | constexpr _Iterator |
| 2136 | operator--(int) requires bidirectional_range<_Base> |
| 2137 | { |
| 2138 | auto __tmp = *this; |
| 2139 | --*this; |
| 2140 | return __tmp; |
| 2141 | } |
| 2142 | |
| 2143 | constexpr _Iterator& |
| 2144 | operator+=(difference_type __n) requires random_access_range<_Base> |
| 2145 | { |
| 2146 | _M_current += __n; |
| 2147 | return *this; |
| 2148 | } |
| 2149 | |
| 2150 | constexpr _Iterator& |
| 2151 | operator-=(difference_type __n) requires random_access_range<_Base> |
| 2152 | { |
| 2153 | _M_current -= __n; |
| 2154 | return *this; |
| 2155 | } |
| 2156 | |
| 2157 | constexpr decltype(auto) |
| 2158 | operator[](difference_type __n) const |
| 2159 | requires random_access_range<_Base> |
| 2160 | { return _M_fun._M_call_subscript(__n, _M_current); } |
| 2161 | |
| 2162 | friend constexpr bool |
| 2163 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 2164 | requires equality_comparable<_Base_iter> |
| 2165 | { return __x._M_current == __y._M_current; } |
| 2166 | |
| 2167 | friend constexpr bool |
| 2168 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 2169 | requires random_access_range<_Base> |
| 2170 | { return __x._M_current < __y._M_current; } |
| 2171 | |
| 2172 | friend constexpr bool |
| 2173 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 2174 | requires random_access_range<_Base> |
| 2175 | { return __y < __x; } |
| 2176 | |
| 2177 | friend constexpr bool |
| 2178 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 2179 | requires random_access_range<_Base> |
| 2180 | { return !(__y < __x); } |
| 2181 | |
| 2182 | friend constexpr bool |
| 2183 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 2184 | requires random_access_range<_Base> |
| 2185 | { return !(__x < __y); } |
| 2186 | |
| 2187 | #ifdef __cpp_lib_three_way_comparison |
| 2188 | friend constexpr auto |
| 2189 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 2190 | requires random_access_range<_Base> |
| 2191 | && three_way_comparable<_Base_iter> |
| 2192 | { return __x._M_current <=> __y._M_current; } |
| 2193 | #endif |
| 2194 | |
| 2195 | friend constexpr _Iterator |
| 2196 | operator+(_Iterator __i, difference_type __n) |
| 2197 | requires random_access_range<_Base> |
| 2198 | { return {__i._M_fun, __i._M_current + __n}; } |
| 2199 | |
| 2200 | friend constexpr _Iterator |
| 2201 | operator+(difference_type __n, _Iterator __i) |
| 2202 | requires random_access_range<_Base> |
| 2203 | { return {__i._M_fun, __i._M_current + __n}; } |
| 2204 | |
| 2205 | friend constexpr _Iterator |
| 2206 | operator-(_Iterator __i, difference_type __n) |
| 2207 | requires random_access_range<_Base> |
| 2208 | { return {__i._M_fun, __i._M_current - __n}; } |
| 2209 | |
| 2210 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2211 | // 3483. transform_view::iterator's difference is overconstrained |
| 2212 | friend constexpr difference_type |
| 2213 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 2214 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 2215 | { return __x._M_current - __y._M_current; } |
| 2216 | |
| 2217 | friend constexpr decltype(auto) |
| 2218 | iter_move(const _Iterator& __i) noexcept(noexcept(*__i)) |
| 2219 | { |
| 2220 | if constexpr (is_lvalue_reference_v<decltype(*__i)>) |
| 2221 | return std::move(*__i); |
| 2222 | else |
| 2223 | return *__i; |
| 2224 | } |
| 2225 | |
| 2226 | friend _Iterator<!_Const>; |
| 2227 | template<bool> friend struct _Sentinel; |
| 2228 | }; |
| 2229 | |
| 2230 | template<bool _Const> |
| 2231 | struct _Sentinel |
| 2232 | { |
| 2233 | private: |
| 2234 | using _Parent = __detail::__maybe_const_t<_Const, transform_view>; |
| 2235 | using _Base = transform_view::_Base<_Const>; |
| 2236 | |
| 2237 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 2238 | |
| 2239 | public: |
| 2240 | _Sentinel() = default; |
| 2241 | |
| 2242 | constexpr explicit |
| 2243 | _Sentinel(sentinel_t<_Base> __end) |
| 2244 | : _M_end(__end) |
| 2245 | { } |
| 2246 | |
| 2247 | constexpr |
| 2248 | _Sentinel(_Sentinel<!_Const> __i) |
| 2249 | requires _Const |
| 2250 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 2251 | : _M_end(std::move(__i._M_end)) |
| 2252 | { } |
| 2253 | |
| 2254 | constexpr sentinel_t<_Base> |
| 2255 | base() const |
| 2256 | { return _M_end; } |
| 2257 | |
| 2258 | template<bool _Const2> |
| 2259 | requires sentinel_for<sentinel_t<_Base>, |
| 2260 | iterator_t<__detail::__maybe_const_t<_Const2, _Vp>>> |
| 2261 | friend constexpr bool |
| 2262 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 2263 | { return __x._M_current == __y._M_end; } |
| 2264 | |
| 2265 | template<bool _Const2, |
| 2266 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 2267 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2268 | friend constexpr range_difference_t<_Base2> |
| 2269 | operator-(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 2270 | { return -(__y._M_end - __x._M_current); } |
| 2271 | |
| 2272 | template<bool _Const2, |
| 2273 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 2274 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2275 | friend constexpr range_difference_t<_Base2> |
| 2276 | operator-(const _Sentinel& __y, const _Iterator<_Const2>& __x) |
| 2277 | { return __y._M_end - __x._M_current; } |
| 2278 | |
| 2279 | friend _Sentinel<!_Const>; |
| 2280 | }; |
| 2281 | |
| 2282 | _Vp _M_base = _Vp(); |
| 2283 | [[no_unique_address]] __detail::__box<_Fp> _M_fun; |
| 2284 | |
| 2285 | public: |
| 2286 | transform_view() requires (default_initializable<_Vp> |
| 2287 | && default_initializable<_Fp>) |
| 2288 | = default; |
| 2289 | |
| 2290 | constexpr explicit |
| 2291 | transform_view(_Vp __base, _Fp __fun) |
| 2292 | : _M_base(std::move(__base)), _M_fun(std::move(__fun)) |
| 2293 | { } |
| 2294 | |
| 2295 | constexpr _Vp |
| 2296 | base() const& requires copy_constructible<_Vp> |
| 2297 | { return _M_base ; } |
| 2298 | |
| 2299 | constexpr _Vp |
| 2300 | base() && |
| 2301 | { return std::move(_M_base); } |
| 2302 | |
| 2303 | constexpr _Iterator<false> |
| 2304 | begin() |
| 2305 | { return _Iterator<false>{this, ranges::begin(_M_base)}; } |
| 2306 | |
| 2307 | constexpr _Iterator<true> |
| 2308 | begin() const |
| 2309 | requires range<const _Vp> |
| 2310 | && regular_invocable<const _Fp&, range_reference_t<const _Vp>> |
| 2311 | { return _Iterator<true>{this, ranges::begin(_M_base)}; } |
| 2312 | |
| 2313 | constexpr _Sentinel<false> |
| 2314 | end() |
| 2315 | { return _Sentinel<false>{ranges::end(_M_base)}; } |
| 2316 | |
| 2317 | constexpr _Iterator<false> |
| 2318 | end() requires common_range<_Vp> |
| 2319 | { return _Iterator<false>{this, ranges::end(_M_base)}; } |
| 2320 | |
| 2321 | constexpr _Sentinel<true> |
| 2322 | end() const |
| 2323 | requires range<const _Vp> |
| 2324 | && regular_invocable<const _Fp&, range_reference_t<const _Vp>> |
| 2325 | { return _Sentinel<true>{ranges::end(_M_base)}; } |
| 2326 | |
| 2327 | constexpr _Iterator<true> |
| 2328 | end() const |
| 2329 | requires common_range<const _Vp> |
| 2330 | && regular_invocable<const _Fp&, range_reference_t<const _Vp>> |
| 2331 | { return _Iterator<true>{this, ranges::end(_M_base)}; } |
| 2332 | |
| 2333 | constexpr auto |
| 2334 | size() requires sized_range<_Vp> |
| 2335 | { return ranges::size(_M_base); } |
| 2336 | |
| 2337 | constexpr auto |
| 2338 | size() const requires sized_range<const _Vp> |
| 2339 | { return ranges::size(_M_base); } |
| 2340 | }; |
| 2341 | |
| 2342 | template<typename _Range, typename _Fp> |
| 2343 | transform_view(_Range&&, _Fp) -> transform_view<views::all_t<_Range>, _Fp>; |
| 2344 | |
| 2345 | namespace views |
| 2346 | { |
| 2347 | namespace __detail |
| 2348 | { |
| 2349 | template<typename _Range, typename _Fp> |
| 2350 | concept __can_transform_view |
| 2351 | = requires { transform_view(std::declval<_Range>(), std::declval<_Fp>()); }; |
| 2352 | } // namespace __detail |
| 2353 | |
| 2354 | struct _Transform : __adaptor::_RangeAdaptor<_Transform> |
| 2355 | { |
| 2356 | template<viewable_range _Range, typename _Fp> |
| 2357 | requires __detail::__can_transform_view<_Range, _Fp> |
| 2358 | constexpr auto |
| 2359 | operator() [[nodiscard]] (_Range&& __r, _Fp&& __f) const |
| 2360 | { |
| 2361 | return transform_view(std::forward<_Range>(__r), std::forward<_Fp>(__f)); |
| 2362 | } |
| 2363 | |
| 2364 | using _RangeAdaptor<_Transform>::operator(); |
| 2365 | static constexpr int _S_arity = 2; |
| 2366 | static constexpr bool _S_has_simple_extra_args = true; |
| 2367 | }; |
| 2368 | |
| 2369 | inline constexpr _Transform transform; |
| 2370 | } // namespace views |
| 2371 | |
| 2372 | template<view _Vp> |
| 2373 | class take_view : public view_interface<take_view<_Vp>> |
| 2374 | { |
| 2375 | private: |
| 2376 | template<bool _Const> |
| 2377 | using _CI = counted_iterator< |
| 2378 | iterator_t<__detail::__maybe_const_t<_Const, _Vp>>>; |
| 2379 | |
| 2380 | template<bool _Const> |
| 2381 | struct _Sentinel |
| 2382 | { |
| 2383 | private: |
| 2384 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 2385 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 2386 | |
| 2387 | public: |
| 2388 | _Sentinel() = default; |
| 2389 | |
| 2390 | constexpr explicit |
| 2391 | _Sentinel(sentinel_t<_Base> __end) |
| 2392 | : _M_end(__end) |
| 2393 | { } |
| 2394 | |
| 2395 | constexpr |
| 2396 | _Sentinel(_Sentinel<!_Const> __s) |
| 2397 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 2398 | : _M_end(std::move(__s._M_end)) |
| 2399 | { } |
| 2400 | |
| 2401 | constexpr sentinel_t<_Base> |
| 2402 | base() const |
| 2403 | { return _M_end; } |
| 2404 | |
| 2405 | friend constexpr bool |
| 2406 | operator==(const _CI<_Const>& __y, const _Sentinel& __x) |
| 2407 | { return __y.count() == 0 || __y.base() == __x._M_end; } |
| 2408 | |
| 2409 | template<bool _OtherConst = !_Const, |
| 2410 | typename _Base2 = __detail::__maybe_const_t<_OtherConst, _Vp>> |
| 2411 | requires sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2412 | friend constexpr bool |
| 2413 | operator==(const _CI<_OtherConst>& __y, const _Sentinel& __x) |
| 2414 | { return __y.count() == 0 || __y.base() == __x._M_end; } |
| 2415 | |
| 2416 | friend _Sentinel<!_Const>; |
| 2417 | }; |
| 2418 | |
| 2419 | _Vp _M_base = _Vp(); |
| 2420 | range_difference_t<_Vp> _M_count = 0; |
| 2421 | |
| 2422 | public: |
| 2423 | take_view() requires default_initializable<_Vp> = default; |
| 2424 | |
| 2425 | constexpr explicit |
| 2426 | take_view(_Vp __base, range_difference_t<_Vp> __count) |
| 2427 | : _M_base(std::move(__base)), _M_count(std::move(__count)) |
| 2428 | { } |
| 2429 | |
| 2430 | constexpr _Vp |
| 2431 | base() const& requires copy_constructible<_Vp> |
| 2432 | { return _M_base; } |
| 2433 | |
| 2434 | constexpr _Vp |
| 2435 | base() && |
| 2436 | { return std::move(_M_base); } |
| 2437 | |
| 2438 | constexpr auto |
| 2439 | begin() requires (!__detail::__simple_view<_Vp>) |
| 2440 | { |
| 2441 | if constexpr (sized_range<_Vp>) |
| 2442 | { |
| 2443 | if constexpr (random_access_range<_Vp>) |
| 2444 | return ranges::begin(_M_base); |
| 2445 | else |
| 2446 | { |
| 2447 | auto __sz = size(); |
| 2448 | return counted_iterator(ranges::begin(_M_base), __sz); |
| 2449 | } |
| 2450 | } |
| 2451 | else |
| 2452 | return counted_iterator(ranges::begin(_M_base), _M_count); |
| 2453 | } |
| 2454 | |
| 2455 | constexpr auto |
| 2456 | begin() const requires range<const _Vp> |
| 2457 | { |
| 2458 | if constexpr (sized_range<const _Vp>) |
| 2459 | { |
| 2460 | if constexpr (random_access_range<const _Vp>) |
| 2461 | return ranges::begin(_M_base); |
| 2462 | else |
| 2463 | { |
| 2464 | auto __sz = size(); |
| 2465 | return counted_iterator(ranges::begin(_M_base), __sz); |
| 2466 | } |
| 2467 | } |
| 2468 | else |
| 2469 | return counted_iterator(ranges::begin(_M_base), _M_count); |
| 2470 | } |
| 2471 | |
| 2472 | constexpr auto |
| 2473 | end() requires (!__detail::__simple_view<_Vp>) |
| 2474 | { |
| 2475 | if constexpr (sized_range<_Vp>) |
| 2476 | { |
| 2477 | if constexpr (random_access_range<_Vp>) |
| 2478 | return ranges::begin(_M_base) + size(); |
| 2479 | else |
| 2480 | return default_sentinel; |
| 2481 | } |
| 2482 | else |
| 2483 | return _Sentinel<false>{ranges::end(_M_base)}; |
| 2484 | } |
| 2485 | |
| 2486 | constexpr auto |
| 2487 | end() const requires range<const _Vp> |
| 2488 | { |
| 2489 | if constexpr (sized_range<const _Vp>) |
| 2490 | { |
| 2491 | if constexpr (random_access_range<const _Vp>) |
| 2492 | return ranges::begin(_M_base) + size(); |
| 2493 | else |
| 2494 | return default_sentinel; |
| 2495 | } |
| 2496 | else |
| 2497 | return _Sentinel<true>{ranges::end(_M_base)}; |
| 2498 | } |
| 2499 | |
| 2500 | constexpr auto |
| 2501 | size() requires sized_range<_Vp> |
| 2502 | { |
| 2503 | auto __n = ranges::size(_M_base); |
| 2504 | return std::min(__n, static_cast<decltype(__n)>(_M_count)); |
| 2505 | } |
| 2506 | |
| 2507 | constexpr auto |
| 2508 | size() const requires sized_range<const _Vp> |
| 2509 | { |
| 2510 | auto __n = ranges::size(_M_base); |
| 2511 | return std::min(__n, static_cast<decltype(__n)>(_M_count)); |
| 2512 | } |
| 2513 | }; |
| 2514 | |
| 2515 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2516 | // 3447. Deduction guides for take_view and drop_view have different |
| 2517 | // constraints |
| 2518 | template<typename _Range> |
| 2519 | take_view(_Range&&, range_difference_t<_Range>) |
| 2520 | -> take_view<views::all_t<_Range>>; |
| 2521 | |
| 2522 | template<typename _Tp> |
| 2523 | inline constexpr bool enable_borrowed_range<take_view<_Tp>> |
| 2524 | = enable_borrowed_range<_Tp>; |
| 2525 | |
| 2526 | namespace views |
| 2527 | { |
| 2528 | namespace __detail |
| 2529 | { |
| 2530 | template<typename _Range> |
| 2531 | inline constexpr bool __is_empty_view = false; |
| 2532 | |
| 2533 | template<typename _Tp> |
| 2534 | inline constexpr bool __is_empty_view<empty_view<_Tp>> = true; |
| 2535 | |
| 2536 | template<typename _Range> |
| 2537 | inline constexpr bool __is_basic_string_view = false; |
| 2538 | |
| 2539 | template<typename _CharT, typename _Traits> |
| 2540 | inline constexpr bool __is_basic_string_view<basic_string_view<_CharT, _Traits>> |
| 2541 | = true; |
| 2542 | |
| 2543 | using ranges::__detail::__is_subrange; |
| 2544 | |
| 2545 | template<typename _Range> |
| 2546 | inline constexpr bool __is_iota_view = false; |
| 2547 | |
| 2548 | template<typename _Winc, typename _Bound> |
| 2549 | inline constexpr bool __is_iota_view<iota_view<_Winc, _Bound>> = true; |
| 2550 | |
| 2551 | template<typename _Range> |
| 2552 | inline constexpr bool __is_repeat_view = false; |
| 2553 | |
| 2554 | template<typename _Range> |
| 2555 | constexpr auto |
| 2556 | __take_of_repeat_view(_Range&&, range_difference_t<_Range>); // defined later |
| 2557 | |
| 2558 | template<typename _Range, typename _Dp> |
| 2559 | concept __can_take_view |
| 2560 | = requires { take_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 2561 | } // namespace __detail |
| 2562 | |
| 2563 | struct _Take : __adaptor::_RangeAdaptor<_Take> |
| 2564 | { |
| 2565 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 2566 | requires __detail::__can_take_view<_Range, _Dp> |
| 2567 | constexpr auto |
| 2568 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 2569 | { |
| 2570 | using _Tp = remove_cvref_t<_Range>; |
| 2571 | if constexpr (__detail::__is_empty_view<_Tp>) |
| 2572 | return _Tp(); |
| 2573 | #ifdef __cpp_lib_optional_range_support // >= C++26 |
| 2574 | else if constexpr (__is_optional_v<_Tp> && view<_Tp>) |
| 2575 | return __n ? std::forward<_Range>(__r) : _Tp(); |
| 2576 | #endif |
| 2577 | else if constexpr (random_access_range<_Tp> |
| 2578 | && sized_range<_Tp> |
| 2579 | && (std::__detail::__is_span<_Tp> |
| 2580 | || __detail::__is_basic_string_view<_Tp> |
| 2581 | || __detail::__is_subrange<_Tp> |
| 2582 | || __detail::__is_iota_view<_Tp>)) |
| 2583 | { |
| 2584 | __n = std::min<_Dp>(ranges::distance(__r), __n); |
| 2585 | auto __begin = ranges::begin(__r); |
| 2586 | auto __end = __begin + __n; |
| 2587 | if constexpr (std::__detail::__is_span<_Tp>) |
| 2588 | return span<typename _Tp::element_type>(__begin, __end); |
| 2589 | else if constexpr (__detail::__is_basic_string_view<_Tp>) |
| 2590 | return _Tp(__begin, __end); |
| 2591 | else if constexpr (__detail::__is_subrange<_Tp>) |
| 2592 | return subrange<iterator_t<_Tp>>(__begin, __end); |
| 2593 | else |
| 2594 | return iota_view(*__begin, *__end); |
| 2595 | } |
| 2596 | else if constexpr (__detail::__is_repeat_view<_Tp>) |
| 2597 | return __detail::__take_of_repeat_view(std::forward<_Range>(__r), __n); |
| 2598 | else |
| 2599 | return take_view(std::forward<_Range>(__r), __n); |
| 2600 | } |
| 2601 | |
| 2602 | using _RangeAdaptor<_Take>::operator(); |
| 2603 | static constexpr int _S_arity = 2; |
| 2604 | // The count argument of views::take is not always simple -- it can be |
| 2605 | // e.g. a move-only class that's implicitly convertible to the difference |
| 2606 | // type. But an integer-like count argument is surely simple. |
| 2607 | template<typename _Tp> |
| 2608 | static constexpr bool _S_has_simple_extra_args |
| 2609 | = ranges::__detail::__is_integer_like<_Tp>; |
| 2610 | }; |
| 2611 | |
| 2612 | inline constexpr _Take take; |
| 2613 | } // namespace views |
| 2614 | |
| 2615 | template<view _Vp, typename _Pred> |
| 2616 | requires input_range<_Vp> && is_object_v<_Pred> |
| 2617 | && indirect_unary_predicate<const _Pred, iterator_t<_Vp>> |
| 2618 | class take_while_view : public view_interface<take_while_view<_Vp, _Pred>> |
| 2619 | { |
| 2620 | template<bool _Const> |
| 2621 | struct _Sentinel |
| 2622 | { |
| 2623 | private: |
| 2624 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 2625 | |
| 2626 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 2627 | const _Pred* _M_pred = nullptr; |
| 2628 | |
| 2629 | public: |
| 2630 | _Sentinel() = default; |
| 2631 | |
| 2632 | constexpr explicit |
| 2633 | _Sentinel(sentinel_t<_Base> __end, const _Pred* __pred) |
| 2634 | : _M_end(__end), _M_pred(__pred) |
| 2635 | { } |
| 2636 | |
| 2637 | constexpr |
| 2638 | _Sentinel(_Sentinel<!_Const> __s) |
| 2639 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 2640 | : _M_end(__s._M_end), _M_pred(__s._M_pred) |
| 2641 | { } |
| 2642 | |
| 2643 | constexpr sentinel_t<_Base> |
| 2644 | base() const { return _M_end; } |
| 2645 | |
| 2646 | friend constexpr bool |
| 2647 | operator==(const iterator_t<_Base>& __x, const _Sentinel& __y) |
| 2648 | { return __y._M_end == __x || !std::__invoke(*__y._M_pred, *__x); } |
| 2649 | |
| 2650 | template<bool _OtherConst = !_Const, |
| 2651 | typename _Base2 = __detail::__maybe_const_t<_OtherConst, _Vp>> |
| 2652 | requires sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 2653 | friend constexpr bool |
| 2654 | operator==(const iterator_t<_Base2>& __x, const _Sentinel& __y) |
| 2655 | { return __y._M_end == __x || !std::__invoke(*__y._M_pred, *__x); } |
| 2656 | |
| 2657 | friend _Sentinel<!_Const>; |
| 2658 | }; |
| 2659 | |
| 2660 | _Vp _M_base = _Vp(); |
| 2661 | [[no_unique_address]] __detail::__box<_Pred> _M_pred; |
| 2662 | |
| 2663 | public: |
| 2664 | take_while_view() requires (default_initializable<_Vp> |
| 2665 | && default_initializable<_Pred>) |
| 2666 | = default; |
| 2667 | |
| 2668 | constexpr explicit |
| 2669 | take_while_view(_Vp __base, _Pred __pred) |
| 2670 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 2671 | { } |
| 2672 | |
| 2673 | constexpr _Vp |
| 2674 | base() const& requires copy_constructible<_Vp> |
| 2675 | { return _M_base; } |
| 2676 | |
| 2677 | constexpr _Vp |
| 2678 | base() && |
| 2679 | { return std::move(_M_base); } |
| 2680 | |
| 2681 | constexpr const _Pred& |
| 2682 | pred() const |
| 2683 | { return *_M_pred; } |
| 2684 | |
| 2685 | constexpr auto |
| 2686 | begin() requires (!__detail::__simple_view<_Vp>) |
| 2687 | { return ranges::begin(_M_base); } |
| 2688 | |
| 2689 | constexpr auto |
| 2690 | begin() const requires range<const _Vp> |
| 2691 | && indirect_unary_predicate<const _Pred, iterator_t<const _Vp>> |
| 2692 | { return ranges::begin(_M_base); } |
| 2693 | |
| 2694 | constexpr auto |
| 2695 | end() requires (!__detail::__simple_view<_Vp>) |
| 2696 | { return _Sentinel<false>(ranges::end(_M_base), |
| 2697 | std::__addressof(*_M_pred)); } |
| 2698 | |
| 2699 | constexpr auto |
| 2700 | end() const requires range<const _Vp> |
| 2701 | && indirect_unary_predicate<const _Pred, iterator_t<const _Vp>> |
| 2702 | { return _Sentinel<true>(ranges::end(_M_base), |
| 2703 | std::__addressof(*_M_pred)); } |
| 2704 | }; |
| 2705 | |
| 2706 | template<typename _Range, typename _Pred> |
| 2707 | take_while_view(_Range&&, _Pred) |
| 2708 | -> take_while_view<views::all_t<_Range>, _Pred>; |
| 2709 | |
| 2710 | namespace views |
| 2711 | { |
| 2712 | namespace __detail |
| 2713 | { |
| 2714 | template<typename _Range, typename _Pred> |
| 2715 | concept __can_take_while_view |
| 2716 | = requires { take_while_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 2717 | } // namespace __detail |
| 2718 | |
| 2719 | struct _TakeWhile : __adaptor::_RangeAdaptor<_TakeWhile> |
| 2720 | { |
| 2721 | template<viewable_range _Range, typename _Pred> |
| 2722 | requires __detail::__can_take_while_view<_Range, _Pred> |
| 2723 | constexpr auto |
| 2724 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __p) const |
| 2725 | { |
| 2726 | return take_while_view(std::forward<_Range>(__r), std::forward<_Pred>(__p)); |
| 2727 | } |
| 2728 | |
| 2729 | using _RangeAdaptor<_TakeWhile>::operator(); |
| 2730 | static constexpr int _S_arity = 2; |
| 2731 | static constexpr bool _S_has_simple_extra_args = true; |
| 2732 | }; |
| 2733 | |
| 2734 | inline constexpr _TakeWhile take_while; |
| 2735 | } // namespace views |
| 2736 | |
| 2737 | template<view _Vp> |
| 2738 | class drop_view : public view_interface<drop_view<_Vp>> |
| 2739 | { |
| 2740 | private: |
| 2741 | _Vp _M_base = _Vp(); |
| 2742 | range_difference_t<_Vp> _M_count = 0; |
| 2743 | |
| 2744 | // ranges::next(begin(base), count, end(base)) is O(1) if _Vp satisfies |
| 2745 | // both random_access_range and sized_range. Otherwise, cache its result. |
| 2746 | static constexpr bool _S_needs_cached_begin |
| 2747 | = !(random_access_range<const _Vp> && sized_range<const _Vp>); |
| 2748 | [[no_unique_address]] |
| 2749 | __detail::__maybe_present_t<_S_needs_cached_begin, |
| 2750 | __detail::_CachedPosition<_Vp>> |
| 2751 | _M_cached_begin; |
| 2752 | |
| 2753 | public: |
| 2754 | drop_view() requires default_initializable<_Vp> = default; |
| 2755 | |
| 2756 | constexpr explicit |
| 2757 | drop_view(_Vp __base, range_difference_t<_Vp> __count) |
| 2758 | : _M_base(std::move(__base)), _M_count(__count) |
| 2759 | { __glibcxx_assert(__count >= 0); } |
| 2760 | |
| 2761 | constexpr _Vp |
| 2762 | base() const& requires copy_constructible<_Vp> |
| 2763 | { return _M_base; } |
| 2764 | |
| 2765 | constexpr _Vp |
| 2766 | base() && |
| 2767 | { return std::move(_M_base); } |
| 2768 | |
| 2769 | // This overload is disabled for simple views with constant-time begin(). |
| 2770 | constexpr auto |
| 2771 | begin() |
| 2772 | requires (!(__detail::__simple_view<_Vp> |
| 2773 | && random_access_range<const _Vp> |
| 2774 | && sized_range<const _Vp>)) |
| 2775 | { |
| 2776 | if constexpr (_S_needs_cached_begin) |
| 2777 | if (_M_cached_begin._M_has_value()) |
| 2778 | return _M_cached_begin._M_get(_M_base); |
| 2779 | |
| 2780 | auto __it = ranges::next(ranges::begin(_M_base), |
| 2781 | _M_count, ranges::end(_M_base)); |
| 2782 | if constexpr (_S_needs_cached_begin) |
| 2783 | _M_cached_begin._M_set(_M_base, __it); |
| 2784 | return __it; |
| 2785 | } |
| 2786 | |
| 2787 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 2788 | // 3482. drop_view's const begin should additionally require sized_range |
| 2789 | constexpr auto |
| 2790 | begin() const |
| 2791 | requires random_access_range<const _Vp> && sized_range<const _Vp> |
| 2792 | { |
| 2793 | return ranges::begin(_M_base) + ranges::min(ranges::distance(_M_base), |
| 2794 | _M_count); |
| 2795 | } |
| 2796 | |
| 2797 | constexpr auto |
| 2798 | end() requires (!__detail::__simple_view<_Vp>) |
| 2799 | { return ranges::end(_M_base); } |
| 2800 | |
| 2801 | constexpr auto |
| 2802 | end() const requires range<const _Vp> |
| 2803 | { return ranges::end(_M_base); } |
| 2804 | |
| 2805 | constexpr auto |
| 2806 | size() requires sized_range<_Vp> |
| 2807 | { |
| 2808 | const auto __s = ranges::size(_M_base); |
| 2809 | const auto __c = static_cast<decltype(__s)>(_M_count); |
| 2810 | return __s < __c ? 0 : __s - __c; |
| 2811 | } |
| 2812 | |
| 2813 | constexpr auto |
| 2814 | size() const requires sized_range<const _Vp> |
| 2815 | { |
| 2816 | const auto __s = ranges::size(_M_base); |
| 2817 | const auto __c = static_cast<decltype(__s)>(_M_count); |
| 2818 | return __s < __c ? 0 : __s - __c; |
| 2819 | } |
| 2820 | }; |
| 2821 | |
| 2822 | template<typename _Range> |
| 2823 | drop_view(_Range&&, range_difference_t<_Range>) |
| 2824 | -> drop_view<views::all_t<_Range>>; |
| 2825 | |
| 2826 | template<typename _Tp> |
| 2827 | inline constexpr bool enable_borrowed_range<drop_view<_Tp>> |
| 2828 | = enable_borrowed_range<_Tp>; |
| 2829 | |
| 2830 | namespace views |
| 2831 | { |
| 2832 | namespace __detail |
| 2833 | { |
| 2834 | template<typename _Range> |
| 2835 | constexpr auto |
| 2836 | __drop_of_repeat_view(_Range&&, range_difference_t<_Range>); // defined later |
| 2837 | |
| 2838 | template<typename _Range, typename _Dp> |
| 2839 | concept __can_drop_view |
| 2840 | = requires { drop_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 2841 | } // namespace __detail |
| 2842 | |
| 2843 | struct _Drop : __adaptor::_RangeAdaptor<_Drop> |
| 2844 | { |
| 2845 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 2846 | requires __detail::__can_drop_view<_Range, _Dp> |
| 2847 | constexpr auto |
| 2848 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 2849 | { |
| 2850 | using _Tp = remove_cvref_t<_Range>; |
| 2851 | if constexpr (__detail::__is_empty_view<_Tp>) |
| 2852 | return _Tp(); |
| 2853 | #ifdef __cpp_lib_optional_range_support // >= C++26 |
| 2854 | else if constexpr (__is_optional_v<_Tp> && view<_Tp>) |
| 2855 | return __n ? _Tp() : std::forward<_Range>(__r); |
| 2856 | #endif |
| 2857 | else if constexpr (random_access_range<_Tp> |
| 2858 | && sized_range<_Tp> |
| 2859 | && (std::__detail::__is_span<_Tp> |
| 2860 | || __detail::__is_basic_string_view<_Tp> |
| 2861 | || __detail::__is_iota_view<_Tp> |
| 2862 | || __detail::__is_subrange<_Tp>)) |
| 2863 | { |
| 2864 | __n = std::min<_Dp>(ranges::distance(__r), __n); |
| 2865 | auto __begin = ranges::begin(__r) + __n; |
| 2866 | auto __end = ranges::end(__r); |
| 2867 | if constexpr (std::__detail::__is_span<_Tp>) |
| 2868 | return span<typename _Tp::element_type>(__begin, __end); |
| 2869 | else if constexpr (__detail::__is_subrange<_Tp>) |
| 2870 | { |
| 2871 | if constexpr (_Tp::_S_store_size) |
| 2872 | { |
| 2873 | using ranges::__detail::__to_unsigned_like; |
| 2874 | auto __m = ranges::distance(__r) - __n; |
| 2875 | return _Tp(__begin, __end, __to_unsigned_like(__m)); |
| 2876 | } |
| 2877 | else |
| 2878 | return _Tp(__begin, __end); |
| 2879 | } |
| 2880 | else |
| 2881 | return _Tp(__begin, __end); |
| 2882 | } |
| 2883 | else if constexpr (__detail::__is_repeat_view<_Tp>) |
| 2884 | return __detail::__drop_of_repeat_view(std::forward<_Range>(__r), __n); |
| 2885 | else |
| 2886 | return drop_view(std::forward<_Range>(__r), __n); |
| 2887 | } |
| 2888 | |
| 2889 | using _RangeAdaptor<_Drop>::operator(); |
| 2890 | static constexpr int _S_arity = 2; |
| 2891 | template<typename _Tp> |
| 2892 | static constexpr bool _S_has_simple_extra_args |
| 2893 | = _Take::_S_has_simple_extra_args<_Tp>; |
| 2894 | }; |
| 2895 | |
| 2896 | inline constexpr _Drop drop; |
| 2897 | } // namespace views |
| 2898 | |
| 2899 | template<view _Vp, typename _Pred> |
| 2900 | requires input_range<_Vp> && is_object_v<_Pred> |
| 2901 | && indirect_unary_predicate<const _Pred, iterator_t<_Vp>> |
| 2902 | class drop_while_view : public view_interface<drop_while_view<_Vp, _Pred>> |
| 2903 | { |
| 2904 | private: |
| 2905 | _Vp _M_base = _Vp(); |
| 2906 | [[no_unique_address]] __detail::__box<_Pred> _M_pred; |
| 2907 | [[no_unique_address]] __detail::_CachedPosition<_Vp> _M_cached_begin; |
| 2908 | |
| 2909 | public: |
| 2910 | drop_while_view() requires (default_initializable<_Vp> |
| 2911 | && default_initializable<_Pred>) |
| 2912 | = default; |
| 2913 | |
| 2914 | constexpr explicit |
| 2915 | drop_while_view(_Vp __base, _Pred __pred) |
| 2916 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 2917 | { } |
| 2918 | |
| 2919 | constexpr _Vp |
| 2920 | base() const& requires copy_constructible<_Vp> |
| 2921 | { return _M_base; } |
| 2922 | |
| 2923 | constexpr _Vp |
| 2924 | base() && |
| 2925 | { return std::move(_M_base); } |
| 2926 | |
| 2927 | constexpr const _Pred& |
| 2928 | pred() const |
| 2929 | { return *_M_pred; } |
| 2930 | |
| 2931 | constexpr auto |
| 2932 | begin() |
| 2933 | { |
| 2934 | if (_M_cached_begin._M_has_value()) |
| 2935 | return _M_cached_begin._M_get(_M_base); |
| 2936 | |
| 2937 | __glibcxx_assert(_M_pred.has_value()); |
| 2938 | auto __it = ranges::find_if_not(ranges::begin(_M_base), |
| 2939 | ranges::end(_M_base), |
| 2940 | std::cref(*_M_pred)); |
| 2941 | _M_cached_begin._M_set(_M_base, __it); |
| 2942 | return __it; |
| 2943 | } |
| 2944 | |
| 2945 | constexpr auto |
| 2946 | end() |
| 2947 | { return ranges::end(_M_base); } |
| 2948 | }; |
| 2949 | |
| 2950 | template<typename _Range, typename _Pred> |
| 2951 | drop_while_view(_Range&&, _Pred) |
| 2952 | -> drop_while_view<views::all_t<_Range>, _Pred>; |
| 2953 | |
| 2954 | template<typename _Tp, typename _Pred> |
| 2955 | inline constexpr bool enable_borrowed_range<drop_while_view<_Tp, _Pred>> |
| 2956 | = enable_borrowed_range<_Tp>; |
| 2957 | |
| 2958 | namespace views |
| 2959 | { |
| 2960 | namespace __detail |
| 2961 | { |
| 2962 | template<typename _Range, typename _Pred> |
| 2963 | concept __can_drop_while_view |
| 2964 | = requires { drop_while_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 2965 | } // namespace __detail |
| 2966 | |
| 2967 | struct _DropWhile : __adaptor::_RangeAdaptor<_DropWhile> |
| 2968 | { |
| 2969 | template<viewable_range _Range, typename _Pred> |
| 2970 | requires __detail::__can_drop_while_view<_Range, _Pred> |
| 2971 | constexpr auto |
| 2972 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __p) const |
| 2973 | { |
| 2974 | return drop_while_view(std::forward<_Range>(__r), |
| 2975 | std::forward<_Pred>(__p)); |
| 2976 | } |
| 2977 | |
| 2978 | using _RangeAdaptor<_DropWhile>::operator(); |
| 2979 | static constexpr int _S_arity = 2; |
| 2980 | static constexpr bool _S_has_simple_extra_args = true; |
| 2981 | }; |
| 2982 | |
| 2983 | inline constexpr _DropWhile drop_while; |
| 2984 | } // namespace views |
| 2985 | |
| 2986 | namespace __detail |
| 2987 | { |
| 2988 | template<typename _Tp> |
| 2989 | constexpr _Tp& |
| 2990 | __as_lvalue(_Tp&& __t) |
| 2991 | { return static_cast<_Tp&>(__t); } |
| 2992 | } // namespace __detail |
| 2993 | |
| 2994 | template<input_range _Vp> |
| 2995 | requires view<_Vp> && input_range<range_reference_t<_Vp>> |
| 2996 | class join_view : public view_interface<join_view<_Vp>> |
| 2997 | { |
| 2998 | private: |
| 2999 | using _InnerRange = range_reference_t<_Vp>; |
| 3000 | |
| 3001 | template<bool _Const> |
| 3002 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 3003 | |
| 3004 | template<bool _Const> |
| 3005 | using _Outer_iter = iterator_t<_Base<_Const>>; |
| 3006 | |
| 3007 | template<bool _Const> |
| 3008 | using _Inner_iter = iterator_t<range_reference_t<_Base<_Const>>>; |
| 3009 | |
| 3010 | template<bool _Const> |
| 3011 | static constexpr bool _S_ref_is_glvalue |
| 3012 | = is_reference_v<range_reference_t<_Base<_Const>>>; |
| 3013 | |
| 3014 | template<bool _Const> |
| 3015 | struct __iter_cat |
| 3016 | { }; |
| 3017 | |
| 3018 | template<bool _Const> |
| 3019 | requires _S_ref_is_glvalue<_Const> |
| 3020 | && forward_range<_Base<_Const>> |
| 3021 | && forward_range<range_reference_t<_Base<_Const>>> |
| 3022 | struct __iter_cat<_Const> |
| 3023 | { |
| 3024 | private: |
| 3025 | static constexpr auto |
| 3026 | _S_iter_cat() |
| 3027 | { |
| 3028 | using _Outer_iter = join_view::_Outer_iter<_Const>; |
| 3029 | using _Inner_iter = join_view::_Inner_iter<_Const>; |
| 3030 | using _OuterCat = typename iterator_traits<_Outer_iter>::iterator_category; |
| 3031 | using _InnerCat = typename iterator_traits<_Inner_iter>::iterator_category; |
| 3032 | if constexpr (derived_from<_OuterCat, bidirectional_iterator_tag> |
| 3033 | && derived_from<_InnerCat, bidirectional_iterator_tag> |
| 3034 | && common_range<range_reference_t<_Base<_Const>>>) |
| 3035 | return bidirectional_iterator_tag{}; |
| 3036 | else if constexpr (derived_from<_OuterCat, forward_iterator_tag> |
| 3037 | && derived_from<_InnerCat, forward_iterator_tag>) |
| 3038 | return forward_iterator_tag{}; |
| 3039 | else |
| 3040 | return input_iterator_tag{}; |
| 3041 | } |
| 3042 | public: |
| 3043 | using iterator_category = decltype(_S_iter_cat()); |
| 3044 | }; |
| 3045 | |
| 3046 | template<bool _Const> |
| 3047 | struct _Sentinel; |
| 3048 | |
| 3049 | template<bool _Const> |
| 3050 | struct _Iterator : __iter_cat<_Const> |
| 3051 | { |
| 3052 | private: |
| 3053 | using _Parent = __detail::__maybe_const_t<_Const, join_view>; |
| 3054 | using _Base = join_view::_Base<_Const>; |
| 3055 | |
| 3056 | friend join_view; |
| 3057 | |
| 3058 | static constexpr bool _S_ref_is_glvalue |
| 3059 | = join_view::_S_ref_is_glvalue<_Const>; |
| 3060 | |
| 3061 | constexpr void |
| 3062 | _M_satisfy() |
| 3063 | { |
| 3064 | auto __update_inner = [this] (const iterator_t<_Base>& __x) -> auto&& { |
| 3065 | if constexpr (_S_ref_is_glvalue) |
| 3066 | return *__x; |
| 3067 | else |
| 3068 | return _M_parent->_M_inner._M_emplace_deref(__x); |
| 3069 | }; |
| 3070 | |
| 3071 | _Outer_iter& __outer = _M_get_outer(); |
| 3072 | for (; __outer != ranges::end(_M_parent->_M_base); ++__outer) |
| 3073 | { |
| 3074 | auto&& __inner = __update_inner(__outer); |
| 3075 | _M_inner = ranges::begin(__inner); |
| 3076 | if (_M_inner != ranges::end(__inner)) |
| 3077 | return; |
| 3078 | } |
| 3079 | |
| 3080 | if constexpr (_S_ref_is_glvalue) |
| 3081 | { |
| 3082 | if constexpr (forward_iterator<_Inner_iter>) |
| 3083 | _M_inner = _Inner_iter(); |
| 3084 | else |
| 3085 | _M_inner.reset(); |
| 3086 | } |
| 3087 | } |
| 3088 | |
| 3089 | static constexpr auto |
| 3090 | _S_iter_concept() |
| 3091 | { |
| 3092 | if constexpr (_S_ref_is_glvalue |
| 3093 | && bidirectional_range<_Base> |
| 3094 | && bidirectional_range<range_reference_t<_Base>> |
| 3095 | && common_range<range_reference_t<_Base>>) |
| 3096 | return bidirectional_iterator_tag{}; |
| 3097 | else if constexpr (_S_ref_is_glvalue |
| 3098 | && forward_range<_Base> |
| 3099 | && forward_range<range_reference_t<_Base>>) |
| 3100 | return forward_iterator_tag{}; |
| 3101 | else |
| 3102 | return input_iterator_tag{}; |
| 3103 | } |
| 3104 | |
| 3105 | using _Outer_iter = join_view::_Outer_iter<_Const>; |
| 3106 | using _Inner_iter = join_view::_Inner_iter<_Const>; |
| 3107 | |
| 3108 | constexpr _Outer_iter& |
| 3109 | _M_get_outer() |
| 3110 | { |
| 3111 | if constexpr (forward_range<_Base>) |
| 3112 | return _M_outer; |
| 3113 | else |
| 3114 | return *_M_parent->_M_outer; |
| 3115 | } |
| 3116 | |
| 3117 | constexpr const _Outer_iter& |
| 3118 | _M_get_outer() const |
| 3119 | { |
| 3120 | if constexpr (forward_range<_Base>) |
| 3121 | return _M_outer; |
| 3122 | else |
| 3123 | return *_M_parent->_M_outer; |
| 3124 | } |
| 3125 | |
| 3126 | constexpr _Inner_iter& |
| 3127 | _M_get_inner() noexcept |
| 3128 | { |
| 3129 | if constexpr (forward_iterator<_Inner_iter>) |
| 3130 | return _M_inner; |
| 3131 | else |
| 3132 | return *_M_inner; |
| 3133 | } |
| 3134 | |
| 3135 | constexpr const _Inner_iter& |
| 3136 | _M_get_inner() const noexcept |
| 3137 | { |
| 3138 | if constexpr (forward_iterator<_Inner_iter>) |
| 3139 | return _M_inner; |
| 3140 | else |
| 3141 | return *_M_inner; |
| 3142 | } |
| 3143 | |
| 3144 | constexpr |
| 3145 | _Iterator(_Parent* __parent, _Outer_iter __outer) requires forward_range<_Base> |
| 3146 | : _M_outer(std::move(__outer)), _M_parent(__parent) |
| 3147 | { _M_satisfy(); } |
| 3148 | |
| 3149 | constexpr explicit |
| 3150 | _Iterator(_Parent* __parent) requires (!forward_range<_Base>) |
| 3151 | : _M_parent(__parent) |
| 3152 | { _M_satisfy(); } |
| 3153 | |
| 3154 | [[no_unique_address]] |
| 3155 | __detail::__maybe_present_t<forward_range<_Base>, _Outer_iter> _M_outer |
| 3156 | = decltype(_M_outer)(); |
| 3157 | __conditional_t<forward_iterator<_Inner_iter>, |
| 3158 | _Inner_iter, optional<_Inner_iter>> _M_inner |
| 3159 | = decltype(_M_inner)(); |
| 3160 | _Parent* _M_parent = nullptr; |
| 3161 | |
| 3162 | public: |
| 3163 | using iterator_concept = decltype(_S_iter_concept()); |
| 3164 | // iterator_category defined in __join_view_iter_cat |
| 3165 | using value_type = range_value_t<range_reference_t<_Base>>; |
| 3166 | using difference_type |
| 3167 | = common_type_t<range_difference_t<_Base>, |
| 3168 | range_difference_t<range_reference_t<_Base>>>; |
| 3169 | |
| 3170 | _Iterator() = default; |
| 3171 | |
| 3172 | constexpr |
| 3173 | _Iterator(_Iterator<!_Const> __i) |
| 3174 | requires _Const |
| 3175 | && convertible_to<iterator_t<_Vp>, _Outer_iter> |
| 3176 | && convertible_to<iterator_t<_InnerRange>, _Inner_iter> |
| 3177 | : _M_outer(std::move(__i._M_outer)), _M_inner(std::move(__i._M_inner)), |
| 3178 | _M_parent(__i._M_parent) |
| 3179 | { } |
| 3180 | |
| 3181 | constexpr decltype(auto) |
| 3182 | operator*() const |
| 3183 | { return *_M_get_inner(); } |
| 3184 | |
| 3185 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3186 | // 3500. join_view::iterator::operator->() is bogus |
| 3187 | constexpr _Inner_iter |
| 3188 | operator->() const |
| 3189 | requires __detail::__has_arrow<_Inner_iter> |
| 3190 | && copyable<_Inner_iter> |
| 3191 | { return _M_get_inner(); } |
| 3192 | |
| 3193 | constexpr _Iterator& |
| 3194 | operator++() |
| 3195 | { |
| 3196 | auto&& __inner_range = [this] () -> auto&& { |
| 3197 | if constexpr (_S_ref_is_glvalue) |
| 3198 | return *_M_get_outer(); |
| 3199 | else |
| 3200 | return *_M_parent->_M_inner; |
| 3201 | }(); |
| 3202 | if (++_M_get_inner() == ranges::end(__inner_range)) |
| 3203 | { |
| 3204 | ++_M_get_outer(); |
| 3205 | _M_satisfy(); |
| 3206 | } |
| 3207 | return *this; |
| 3208 | } |
| 3209 | |
| 3210 | constexpr void |
| 3211 | operator++(int) |
| 3212 | { ++*this; } |
| 3213 | |
| 3214 | constexpr _Iterator |
| 3215 | operator++(int) |
| 3216 | requires _S_ref_is_glvalue && forward_range<_Base> |
| 3217 | && forward_range<range_reference_t<_Base>> |
| 3218 | { |
| 3219 | auto __tmp = *this; |
| 3220 | ++*this; |
| 3221 | return __tmp; |
| 3222 | } |
| 3223 | |
| 3224 | constexpr _Iterator& |
| 3225 | operator--() |
| 3226 | requires _S_ref_is_glvalue && bidirectional_range<_Base> |
| 3227 | && bidirectional_range<range_reference_t<_Base>> |
| 3228 | && common_range<range_reference_t<_Base>> |
| 3229 | { |
| 3230 | if (_M_outer == ranges::end(_M_parent->_M_base)) |
| 3231 | _M_inner = ranges::end(__detail::__as_lvalue(*--_M_outer)); |
| 3232 | while (_M_get_inner() == ranges::begin(__detail::__as_lvalue(*_M_outer))) |
| 3233 | _M_get_inner() = ranges::end(__detail::__as_lvalue(*--_M_outer)); |
| 3234 | --_M_get_inner(); |
| 3235 | return *this; |
| 3236 | } |
| 3237 | |
| 3238 | constexpr _Iterator |
| 3239 | operator--(int) |
| 3240 | requires _S_ref_is_glvalue && bidirectional_range<_Base> |
| 3241 | && bidirectional_range<range_reference_t<_Base>> |
| 3242 | && common_range<range_reference_t<_Base>> |
| 3243 | { |
| 3244 | auto __tmp = *this; |
| 3245 | --*this; |
| 3246 | return __tmp; |
| 3247 | } |
| 3248 | |
| 3249 | friend constexpr bool |
| 3250 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 3251 | requires _S_ref_is_glvalue |
| 3252 | && forward_range<_Base> |
| 3253 | && equality_comparable<_Inner_iter> |
| 3254 | { |
| 3255 | return (__x._M_outer == __y._M_outer |
| 3256 | && __x._M_inner == __y._M_inner); |
| 3257 | } |
| 3258 | |
| 3259 | friend constexpr decltype(auto) |
| 3260 | iter_move(const _Iterator& __i) |
| 3261 | noexcept(noexcept(ranges::iter_move(__i._M_get_inner()))) |
| 3262 | { return ranges::iter_move(__i._M_get_inner()); } |
| 3263 | |
| 3264 | friend constexpr void |
| 3265 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 3266 | noexcept(noexcept(ranges::iter_swap(__x._M_get_inner(), __y._M_get_inner()))) |
| 3267 | requires indirectly_swappable<_Inner_iter> |
| 3268 | { return ranges::iter_swap(__x._M_get_inner(), __y._M_get_inner()); } |
| 3269 | |
| 3270 | friend _Iterator<!_Const>; |
| 3271 | template<bool> friend struct _Sentinel; |
| 3272 | }; |
| 3273 | |
| 3274 | template<bool _Const> |
| 3275 | struct _Sentinel |
| 3276 | { |
| 3277 | private: |
| 3278 | using _Parent = __detail::__maybe_const_t<_Const, join_view>; |
| 3279 | using _Base = join_view::_Base<_Const>; |
| 3280 | |
| 3281 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 3282 | |
| 3283 | public: |
| 3284 | _Sentinel() = default; |
| 3285 | |
| 3286 | constexpr explicit |
| 3287 | _Sentinel(_Parent* __parent) |
| 3288 | : _M_end(ranges::end(__parent->_M_base)) |
| 3289 | { } |
| 3290 | |
| 3291 | constexpr |
| 3292 | _Sentinel(_Sentinel<!_Const> __s) |
| 3293 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 3294 | : _M_end(std::move(__s._M_end)) |
| 3295 | { } |
| 3296 | |
| 3297 | template<bool _Const2> |
| 3298 | requires sentinel_for<sentinel_t<_Base>, |
| 3299 | iterator_t<__detail::__maybe_const_t<_Const2, _Vp>>> |
| 3300 | friend constexpr bool |
| 3301 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 3302 | { return __x._M_get_outer() == __y._M_end; } |
| 3303 | |
| 3304 | friend _Sentinel<!_Const>; |
| 3305 | }; |
| 3306 | |
| 3307 | _Vp _M_base = _Vp(); |
| 3308 | [[no_unique_address]] |
| 3309 | __detail::__maybe_present_t<!forward_range<_Vp>, |
| 3310 | __detail::__non_propagating_cache<iterator_t<_Vp>>> _M_outer; |
| 3311 | [[no_unique_address]] |
| 3312 | __detail::__non_propagating_cache<remove_cv_t<_InnerRange>> _M_inner; |
| 3313 | |
| 3314 | public: |
| 3315 | join_view() requires default_initializable<_Vp> = default; |
| 3316 | |
| 3317 | constexpr explicit |
| 3318 | join_view(_Vp __base) |
| 3319 | : _M_base(std::move(__base)) |
| 3320 | { } |
| 3321 | |
| 3322 | constexpr _Vp |
| 3323 | base() const& requires copy_constructible<_Vp> |
| 3324 | { return _M_base; } |
| 3325 | |
| 3326 | constexpr _Vp |
| 3327 | base() && |
| 3328 | { return std::move(_M_base); } |
| 3329 | |
| 3330 | constexpr auto |
| 3331 | begin() |
| 3332 | { |
| 3333 | if constexpr (forward_range<_Vp>) |
| 3334 | { |
| 3335 | constexpr bool __use_const |
| 3336 | = (__detail::__simple_view<_Vp> |
| 3337 | && is_reference_v<range_reference_t<_Vp>>); |
| 3338 | return _Iterator<__use_const>{this, ranges::begin(_M_base)}; |
| 3339 | } |
| 3340 | else |
| 3341 | { |
| 3342 | _M_outer = ranges::begin(_M_base); |
| 3343 | return _Iterator<false>{this}; |
| 3344 | } |
| 3345 | } |
| 3346 | |
| 3347 | constexpr auto |
| 3348 | begin() const |
| 3349 | requires forward_range<const _Vp> |
| 3350 | && is_reference_v<range_reference_t<const _Vp>> |
| 3351 | && input_range<range_reference_t<const _Vp>> |
| 3352 | { |
| 3353 | return _Iterator<true>{this, ranges::begin(_M_base)}; |
| 3354 | } |
| 3355 | |
| 3356 | constexpr auto |
| 3357 | end() |
| 3358 | { |
| 3359 | if constexpr (forward_range<_Vp> && is_reference_v<_InnerRange> |
| 3360 | && forward_range<_InnerRange> |
| 3361 | && common_range<_Vp> && common_range<_InnerRange>) |
| 3362 | return _Iterator<__detail::__simple_view<_Vp>>{this, |
| 3363 | ranges::end(_M_base)}; |
| 3364 | else |
| 3365 | return _Sentinel<__detail::__simple_view<_Vp>>{this}; |
| 3366 | } |
| 3367 | |
| 3368 | constexpr auto |
| 3369 | end() const |
| 3370 | requires forward_range<const _Vp> |
| 3371 | && is_reference_v<range_reference_t<const _Vp>> |
| 3372 | && input_range<range_reference_t<const _Vp>> |
| 3373 | { |
| 3374 | if constexpr (is_reference_v<range_reference_t<const _Vp>> |
| 3375 | && forward_range<range_reference_t<const _Vp>> |
| 3376 | && common_range<const _Vp> |
| 3377 | && common_range<range_reference_t<const _Vp>>) |
| 3378 | return _Iterator<true>{this, ranges::end(_M_base)}; |
| 3379 | else |
| 3380 | return _Sentinel<true>{this}; |
| 3381 | } |
| 3382 | }; |
| 3383 | |
| 3384 | template<typename _Range> |
| 3385 | explicit join_view(_Range&&) -> join_view<views::all_t<_Range>>; |
| 3386 | |
| 3387 | namespace views |
| 3388 | { |
| 3389 | namespace __detail |
| 3390 | { |
| 3391 | template<typename _Range> |
| 3392 | concept __can_join_view |
| 3393 | = requires { join_view<all_t<_Range>>{std::declval<_Range>()}; }; |
| 3394 | } // namespace __detail |
| 3395 | |
| 3396 | struct _Join : __adaptor::_RangeAdaptorClosure<_Join> |
| 3397 | { |
| 3398 | template<viewable_range _Range> |
| 3399 | requires __detail::__can_join_view<_Range> |
| 3400 | constexpr auto |
| 3401 | operator() [[nodiscard]] (_Range&& __r) const |
| 3402 | { |
| 3403 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3404 | // 3474. Nesting join_views is broken because of CTAD |
| 3405 | return join_view<all_t<_Range>>{std::forward<_Range>(__r)}; |
| 3406 | } |
| 3407 | |
| 3408 | static constexpr bool _S_has_simple_call_op = true; |
| 3409 | }; |
| 3410 | |
| 3411 | inline constexpr _Join join; |
| 3412 | } // namespace views |
| 3413 | |
| 3414 | namespace __detail |
| 3415 | { |
| 3416 | template<auto> |
| 3417 | struct __require_constant; |
| 3418 | |
| 3419 | template<typename _Range> |
| 3420 | concept __tiny_range = sized_range<_Range> |
| 3421 | && requires |
| 3422 | { typename __require_constant<remove_reference_t<_Range>::size()>; } |
| 3423 | && (remove_reference_t<_Range>::size() <= 1); |
| 3424 | |
| 3425 | template<typename _Base> |
| 3426 | struct __lazy_split_view_outer_iter_cat |
| 3427 | { }; |
| 3428 | |
| 3429 | template<forward_range _Base> |
| 3430 | struct __lazy_split_view_outer_iter_cat<_Base> |
| 3431 | { using iterator_category = input_iterator_tag; }; |
| 3432 | |
| 3433 | template<typename _Base> |
| 3434 | struct __lazy_split_view_inner_iter_cat |
| 3435 | { }; |
| 3436 | |
| 3437 | template<forward_range _Base> |
| 3438 | struct __lazy_split_view_inner_iter_cat<_Base> |
| 3439 | { |
| 3440 | private: |
| 3441 | static constexpr auto |
| 3442 | _S_iter_cat() |
| 3443 | { |
| 3444 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 3445 | if constexpr (derived_from<_Cat, forward_iterator_tag>) |
| 3446 | return forward_iterator_tag{}; |
| 3447 | else |
| 3448 | return _Cat{}; |
| 3449 | } |
| 3450 | public: |
| 3451 | using iterator_category = decltype(_S_iter_cat()); |
| 3452 | }; |
| 3453 | } |
| 3454 | |
| 3455 | template<input_range _Vp, forward_range _Pattern> |
| 3456 | requires view<_Vp> && view<_Pattern> |
| 3457 | && indirectly_comparable<iterator_t<_Vp>, iterator_t<_Pattern>, |
| 3458 | ranges::equal_to> |
| 3459 | && (forward_range<_Vp> || __detail::__tiny_range<_Pattern>) |
| 3460 | class lazy_split_view : public view_interface<lazy_split_view<_Vp, _Pattern>> |
| 3461 | { |
| 3462 | private: |
| 3463 | template<bool _Const> |
| 3464 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 3465 | |
| 3466 | template<bool _Const> |
| 3467 | struct _InnerIter; |
| 3468 | |
| 3469 | template<bool _Const> |
| 3470 | struct _OuterIter |
| 3471 | : __detail::__lazy_split_view_outer_iter_cat<_Base<_Const>> |
| 3472 | { |
| 3473 | private: |
| 3474 | using _Parent = __detail::__maybe_const_t<_Const, lazy_split_view>; |
| 3475 | using _Base = lazy_split_view::_Base<_Const>; |
| 3476 | |
| 3477 | // [range.lazy.split.outer] p1 |
| 3478 | // Many of the following specifications refer to the notional member |
| 3479 | // current of outer-iterator. current is equivalent to current_ if |
| 3480 | // V models forward_range, and parent_->current_ otherwise. |
| 3481 | constexpr auto& |
| 3482 | __current() noexcept |
| 3483 | { |
| 3484 | if constexpr (forward_range<_Vp>) |
| 3485 | return _M_current; |
| 3486 | else |
| 3487 | return *_M_parent->_M_current; |
| 3488 | } |
| 3489 | |
| 3490 | constexpr auto& |
| 3491 | __current() const noexcept |
| 3492 | { |
| 3493 | if constexpr (forward_range<_Vp>) |
| 3494 | return _M_current; |
| 3495 | else |
| 3496 | return *_M_parent->_M_current; |
| 3497 | } |
| 3498 | |
| 3499 | _Parent* _M_parent = nullptr; |
| 3500 | |
| 3501 | [[no_unique_address]] |
| 3502 | __detail::__maybe_present_t<forward_range<_Vp>, |
| 3503 | iterator_t<_Base>> _M_current |
| 3504 | = decltype(_M_current)(); |
| 3505 | bool _M_trailing_empty = false; |
| 3506 | |
| 3507 | public: |
| 3508 | using iterator_concept = __conditional_t<forward_range<_Base>, |
| 3509 | forward_iterator_tag, |
| 3510 | input_iterator_tag>; |
| 3511 | // iterator_category defined in __lazy_split_view_outer_iter_cat |
| 3512 | using difference_type = range_difference_t<_Base>; |
| 3513 | |
| 3514 | struct value_type : view_interface<value_type> |
| 3515 | { |
| 3516 | private: |
| 3517 | _OuterIter _M_i = _OuterIter(); |
| 3518 | |
| 3519 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3520 | // 4013. lazy_split_view::outer-iterator::value_type should not |
| 3521 | // provide default constructor |
| 3522 | constexpr explicit |
| 3523 | value_type(_OuterIter __i) |
| 3524 | : _M_i(std::move(__i)) |
| 3525 | { } |
| 3526 | |
| 3527 | friend _OuterIter; |
| 3528 | |
| 3529 | public: |
| 3530 | constexpr _InnerIter<_Const> |
| 3531 | begin() const |
| 3532 | { return _InnerIter<_Const>{_M_i}; } |
| 3533 | |
| 3534 | constexpr default_sentinel_t |
| 3535 | end() const noexcept |
| 3536 | { return default_sentinel; } |
| 3537 | }; |
| 3538 | |
| 3539 | _OuterIter() = default; |
| 3540 | |
| 3541 | constexpr explicit |
| 3542 | _OuterIter(_Parent* __parent) requires (!forward_range<_Base>) |
| 3543 | : _M_parent(__parent) |
| 3544 | { } |
| 3545 | |
| 3546 | constexpr |
| 3547 | _OuterIter(_Parent* __parent, iterator_t<_Base> __current) |
| 3548 | requires forward_range<_Base> |
| 3549 | : _M_parent(__parent), |
| 3550 | _M_current(std::move(__current)) |
| 3551 | { } |
| 3552 | |
| 3553 | constexpr |
| 3554 | _OuterIter(_OuterIter<!_Const> __i) |
| 3555 | requires _Const |
| 3556 | && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 3557 | : _M_parent(__i._M_parent), _M_current(std::move(__i._M_current)), |
| 3558 | _M_trailing_empty(__i._M_trailing_empty) |
| 3559 | { } |
| 3560 | |
| 3561 | constexpr value_type |
| 3562 | operator*() const |
| 3563 | { return value_type{*this}; } |
| 3564 | |
| 3565 | constexpr _OuterIter& |
| 3566 | operator++() |
| 3567 | { |
| 3568 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3569 | // 3505. lazy_split_view::outer-iterator::operator++ misspecified |
| 3570 | const auto __end = ranges::end(_M_parent->_M_base); |
| 3571 | if (__current() == __end) |
| 3572 | { |
| 3573 | _M_trailing_empty = false; |
| 3574 | return *this; |
| 3575 | } |
| 3576 | const auto [__pbegin, __pend] = subrange{_M_parent->_M_pattern}; |
| 3577 | if (__pbegin == __pend) |
| 3578 | ++__current(); |
| 3579 | else if constexpr (__detail::__tiny_range<_Pattern>) |
| 3580 | { |
| 3581 | __current() = ranges::find(std::move(__current()), __end, |
| 3582 | *__pbegin); |
| 3583 | if (__current() != __end) |
| 3584 | { |
| 3585 | ++__current(); |
| 3586 | if (__current() == __end) |
| 3587 | _M_trailing_empty = true; |
| 3588 | } |
| 3589 | } |
| 3590 | else |
| 3591 | do |
| 3592 | { |
| 3593 | auto [__b, __p] |
| 3594 | = ranges::mismatch(__current(), __end, __pbegin, __pend); |
| 3595 | if (__p == __pend) |
| 3596 | { |
| 3597 | __current() = __b; |
| 3598 | if (__current() == __end) |
| 3599 | _M_trailing_empty = true; |
| 3600 | break; |
| 3601 | } |
| 3602 | } while (++__current() != __end); |
| 3603 | return *this; |
| 3604 | } |
| 3605 | |
| 3606 | constexpr decltype(auto) |
| 3607 | operator++(int) |
| 3608 | { |
| 3609 | if constexpr (forward_range<_Base>) |
| 3610 | { |
| 3611 | auto __tmp = *this; |
| 3612 | ++*this; |
| 3613 | return __tmp; |
| 3614 | } |
| 3615 | else |
| 3616 | ++*this; |
| 3617 | } |
| 3618 | |
| 3619 | friend constexpr bool |
| 3620 | operator==(const _OuterIter& __x, const _OuterIter& __y) |
| 3621 | requires forward_range<_Base> |
| 3622 | { |
| 3623 | return __x._M_current == __y._M_current |
| 3624 | && __x._M_trailing_empty == __y._M_trailing_empty; |
| 3625 | } |
| 3626 | |
| 3627 | friend constexpr bool |
| 3628 | operator==(const _OuterIter& __x, default_sentinel_t) |
| 3629 | { |
| 3630 | return __x.__current() == ranges::end(__x._M_parent->_M_base) |
| 3631 | && !__x._M_trailing_empty; |
| 3632 | } |
| 3633 | |
| 3634 | friend _OuterIter<!_Const>; |
| 3635 | friend _InnerIter<_Const>; |
| 3636 | }; |
| 3637 | |
| 3638 | template<bool _Const> |
| 3639 | struct _InnerIter |
| 3640 | : __detail::__lazy_split_view_inner_iter_cat<_Base<_Const>> |
| 3641 | { |
| 3642 | private: |
| 3643 | using _Base = lazy_split_view::_Base<_Const>; |
| 3644 | |
| 3645 | constexpr bool |
| 3646 | __at_end() const |
| 3647 | { |
| 3648 | auto [__pcur, __pend] = subrange{_M_i._M_parent->_M_pattern}; |
| 3649 | auto __end = ranges::end(_M_i._M_parent->_M_base); |
| 3650 | if constexpr (__detail::__tiny_range<_Pattern>) |
| 3651 | { |
| 3652 | const auto& __cur = _M_i_current(); |
| 3653 | if (__cur == __end) |
| 3654 | return true; |
| 3655 | if (__pcur == __pend) |
| 3656 | return _M_incremented; |
| 3657 | return *__cur == *__pcur; |
| 3658 | } |
| 3659 | else |
| 3660 | { |
| 3661 | auto __cur = _M_i_current(); |
| 3662 | if (__cur == __end) |
| 3663 | return true; |
| 3664 | if (__pcur == __pend) |
| 3665 | return _M_incremented; |
| 3666 | do |
| 3667 | { |
| 3668 | if (*__cur != *__pcur) |
| 3669 | return false; |
| 3670 | if (++__pcur == __pend) |
| 3671 | return true; |
| 3672 | } while (++__cur != __end); |
| 3673 | return false; |
| 3674 | } |
| 3675 | } |
| 3676 | |
| 3677 | constexpr auto& |
| 3678 | _M_i_current() noexcept |
| 3679 | { return _M_i.__current(); } |
| 3680 | |
| 3681 | constexpr auto& |
| 3682 | _M_i_current() const noexcept |
| 3683 | { return _M_i.__current(); } |
| 3684 | |
| 3685 | _OuterIter<_Const> _M_i = _OuterIter<_Const>(); |
| 3686 | bool _M_incremented = false; |
| 3687 | |
| 3688 | public: |
| 3689 | using iterator_concept |
| 3690 | = typename _OuterIter<_Const>::iterator_concept; |
| 3691 | // iterator_category defined in __lazy_split_view_inner_iter_cat |
| 3692 | using value_type = range_value_t<_Base>; |
| 3693 | using difference_type = range_difference_t<_Base>; |
| 3694 | |
| 3695 | _InnerIter() = default; |
| 3696 | |
| 3697 | constexpr explicit |
| 3698 | _InnerIter(_OuterIter<_Const> __i) |
| 3699 | : _M_i(std::move(__i)) |
| 3700 | { } |
| 3701 | |
| 3702 | constexpr const iterator_t<_Base>& |
| 3703 | base() const& noexcept |
| 3704 | { return _M_i_current(); } |
| 3705 | |
| 3706 | constexpr iterator_t<_Base> |
| 3707 | base() && requires forward_range<_Vp> |
| 3708 | { return std::move(_M_i_current()); } |
| 3709 | |
| 3710 | constexpr decltype(auto) |
| 3711 | operator*() const |
| 3712 | { return *_M_i_current(); } |
| 3713 | |
| 3714 | constexpr _InnerIter& |
| 3715 | operator++() |
| 3716 | { |
| 3717 | _M_incremented = true; |
| 3718 | if constexpr (!forward_range<_Base>) |
| 3719 | if constexpr (_Pattern::size() == 0) |
| 3720 | return *this; |
| 3721 | ++_M_i_current(); |
| 3722 | return *this; |
| 3723 | } |
| 3724 | |
| 3725 | constexpr decltype(auto) |
| 3726 | operator++(int) |
| 3727 | { |
| 3728 | if constexpr (forward_range<_Base>) |
| 3729 | { |
| 3730 | auto __tmp = *this; |
| 3731 | ++*this; |
| 3732 | return __tmp; |
| 3733 | } |
| 3734 | else |
| 3735 | ++*this; |
| 3736 | } |
| 3737 | |
| 3738 | friend constexpr bool |
| 3739 | operator==(const _InnerIter& __x, const _InnerIter& __y) |
| 3740 | requires forward_range<_Base> |
| 3741 | { return __x._M_i == __y._M_i; } |
| 3742 | |
| 3743 | friend constexpr bool |
| 3744 | operator==(const _InnerIter& __x, default_sentinel_t) |
| 3745 | { return __x.__at_end(); } |
| 3746 | |
| 3747 | friend constexpr decltype(auto) |
| 3748 | iter_move(const _InnerIter& __i) |
| 3749 | noexcept(noexcept(ranges::iter_move(__i._M_i_current()))) |
| 3750 | { return ranges::iter_move(__i._M_i_current()); } |
| 3751 | |
| 3752 | friend constexpr void |
| 3753 | iter_swap(const _InnerIter& __x, const _InnerIter& __y) |
| 3754 | noexcept(noexcept(ranges::iter_swap(__x._M_i_current(), |
| 3755 | __y._M_i_current()))) |
| 3756 | requires indirectly_swappable<iterator_t<_Base>> |
| 3757 | { ranges::iter_swap(__x._M_i_current(), __y._M_i_current()); } |
| 3758 | }; |
| 3759 | |
| 3760 | _Vp _M_base = _Vp(); |
| 3761 | _Pattern _M_pattern = _Pattern(); |
| 3762 | [[no_unique_address]] |
| 3763 | __detail::__maybe_present_t<!forward_range<_Vp>, |
| 3764 | __detail::__non_propagating_cache<iterator_t<_Vp>>> _M_current; |
| 3765 | |
| 3766 | |
| 3767 | public: |
| 3768 | lazy_split_view() requires (default_initializable<_Vp> |
| 3769 | && default_initializable<_Pattern>) |
| 3770 | = default; |
| 3771 | |
| 3772 | constexpr explicit |
| 3773 | lazy_split_view(_Vp __base, _Pattern __pattern) |
| 3774 | : _M_base(std::move(__base)), _M_pattern(std::move(__pattern)) |
| 3775 | { } |
| 3776 | |
| 3777 | template<input_range _Range> |
| 3778 | requires constructible_from<_Vp, views::all_t<_Range>> |
| 3779 | && constructible_from<_Pattern, single_view<range_value_t<_Range>>> |
| 3780 | constexpr explicit |
| 3781 | lazy_split_view(_Range&& __r, range_value_t<_Range> __e) |
| 3782 | : _M_base(views::all(std::forward<_Range>(__r))), |
| 3783 | _M_pattern(views::single(std::move(__e))) |
| 3784 | { } |
| 3785 | |
| 3786 | constexpr _Vp |
| 3787 | base() const& requires copy_constructible<_Vp> |
| 3788 | { return _M_base; } |
| 3789 | |
| 3790 | constexpr _Vp |
| 3791 | base() && |
| 3792 | { return std::move(_M_base); } |
| 3793 | |
| 3794 | constexpr auto |
| 3795 | begin() |
| 3796 | { |
| 3797 | if constexpr (forward_range<_Vp>) |
| 3798 | { |
| 3799 | constexpr bool __simple |
| 3800 | = __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 3801 | return _OuterIter<__simple>{this, ranges::begin(_M_base)}; |
| 3802 | } |
| 3803 | else |
| 3804 | { |
| 3805 | _M_current = ranges::begin(_M_base); |
| 3806 | return _OuterIter<false>{this}; |
| 3807 | } |
| 3808 | } |
| 3809 | |
| 3810 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 3811 | // 3599. The const overload of lazy_split_view::begin should be |
| 3812 | // constrained by const Pattern |
| 3813 | constexpr auto |
| 3814 | begin() const requires forward_range<_Vp> && forward_range<const _Vp> |
| 3815 | && forward_range<const _Pattern> |
| 3816 | { |
| 3817 | return _OuterIter<true>{this, ranges::begin(_M_base)}; |
| 3818 | } |
| 3819 | |
| 3820 | constexpr auto |
| 3821 | end() requires forward_range<_Vp> && common_range<_Vp> |
| 3822 | { |
| 3823 | constexpr bool __simple |
| 3824 | = __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 3825 | return _OuterIter<__simple>{this, ranges::end(_M_base)}; |
| 3826 | } |
| 3827 | |
| 3828 | constexpr auto |
| 3829 | end() const |
| 3830 | { |
| 3831 | if constexpr (forward_range<_Vp> |
| 3832 | && forward_range<const _Vp> |
| 3833 | && common_range<const _Vp> |
| 3834 | && forward_range<const _Pattern>) |
| 3835 | return _OuterIter<true>{this, ranges::end(_M_base)}; |
| 3836 | else |
| 3837 | return default_sentinel; |
| 3838 | } |
| 3839 | }; |
| 3840 | |
| 3841 | template<typename _Range, typename _Pattern> |
| 3842 | lazy_split_view(_Range&&, _Pattern&&) |
| 3843 | -> lazy_split_view<views::all_t<_Range>, views::all_t<_Pattern>>; |
| 3844 | |
| 3845 | template<input_range _Range> |
| 3846 | lazy_split_view(_Range&&, range_value_t<_Range>) |
| 3847 | -> lazy_split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>; |
| 3848 | |
| 3849 | namespace views |
| 3850 | { |
| 3851 | namespace __detail |
| 3852 | { |
| 3853 | template<typename _Range, typename _Pattern> |
| 3854 | concept __can_lazy_split_view |
| 3855 | = requires { lazy_split_view(std::declval<_Range>(), std::declval<_Pattern>()); }; |
| 3856 | } // namespace __detail |
| 3857 | |
| 3858 | struct _LazySplit : __adaptor::_RangeAdaptor<_LazySplit> |
| 3859 | { |
| 3860 | template<viewable_range _Range, typename _Pattern> |
| 3861 | requires __detail::__can_lazy_split_view<_Range, _Pattern> |
| 3862 | constexpr auto |
| 3863 | operator() [[nodiscard]] (_Range&& __r, _Pattern&& __f) const |
| 3864 | { |
| 3865 | return lazy_split_view(std::forward<_Range>(__r), std::forward<_Pattern>(__f)); |
| 3866 | } |
| 3867 | |
| 3868 | using _RangeAdaptor<_LazySplit>::operator(); |
| 3869 | static constexpr int _S_arity = 2; |
| 3870 | // The pattern argument of views::lazy_split is not always simple -- it can be |
| 3871 | // a non-view range, the value category of which affects whether the call |
| 3872 | // is well-formed. But a scalar or a view pattern argument is surely |
| 3873 | // simple. |
| 3874 | template<typename _Pattern> |
| 3875 | static constexpr bool _S_has_simple_extra_args |
| 3876 | = is_scalar_v<_Pattern> || (view<_Pattern> |
| 3877 | && copy_constructible<_Pattern>); |
| 3878 | }; |
| 3879 | |
| 3880 | inline constexpr _LazySplit lazy_split; |
| 3881 | } // namespace views |
| 3882 | |
| 3883 | template<forward_range _Vp, forward_range _Pattern> |
| 3884 | requires view<_Vp> && view<_Pattern> |
| 3885 | && indirectly_comparable<iterator_t<_Vp>, iterator_t<_Pattern>, |
| 3886 | ranges::equal_to> |
| 3887 | class split_view : public view_interface<split_view<_Vp, _Pattern>> |
| 3888 | { |
| 3889 | private: |
| 3890 | _Vp _M_base = _Vp(); |
| 3891 | _Pattern _M_pattern = _Pattern(); |
| 3892 | __detail::__non_propagating_cache<subrange<iterator_t<_Vp>>> _M_cached_begin; |
| 3893 | |
| 3894 | struct _Iterator; |
| 3895 | struct _Sentinel; |
| 3896 | |
| 3897 | public: |
| 3898 | split_view() requires (default_initializable<_Vp> |
| 3899 | && default_initializable<_Pattern>) |
| 3900 | = default; |
| 3901 | |
| 3902 | constexpr explicit |
| 3903 | split_view(_Vp __base, _Pattern __pattern) |
| 3904 | : _M_base(std::move(__base)), _M_pattern(std::move(__pattern)) |
| 3905 | { } |
| 3906 | |
| 3907 | template<forward_range _Range> |
| 3908 | requires constructible_from<_Vp, views::all_t<_Range>> |
| 3909 | && constructible_from<_Pattern, single_view<range_value_t<_Range>>> |
| 3910 | constexpr explicit |
| 3911 | split_view(_Range&& __r, range_value_t<_Range> __e) |
| 3912 | : _M_base(views::all(std::forward<_Range>(__r))), |
| 3913 | _M_pattern(views::single(std::move(__e))) |
| 3914 | { } |
| 3915 | |
| 3916 | constexpr _Vp |
| 3917 | base() const& requires copy_constructible<_Vp> |
| 3918 | { return _M_base; } |
| 3919 | |
| 3920 | constexpr _Vp |
| 3921 | base() && |
| 3922 | { return std::move(_M_base); } |
| 3923 | |
| 3924 | constexpr _Iterator |
| 3925 | begin() |
| 3926 | { |
| 3927 | if (!_M_cached_begin) |
| 3928 | _M_cached_begin = _M_find_next(it: ranges::begin(_M_base)); |
| 3929 | return {this, ranges::begin(_M_base), *_M_cached_begin}; |
| 3930 | } |
| 3931 | |
| 3932 | constexpr auto |
| 3933 | end() |
| 3934 | { |
| 3935 | if constexpr (common_range<_Vp>) |
| 3936 | return _Iterator{this, ranges::end(_M_base), {}}; |
| 3937 | else |
| 3938 | return _Sentinel{this}; |
| 3939 | } |
| 3940 | |
| 3941 | constexpr subrange<iterator_t<_Vp>> |
| 3942 | _M_find_next(iterator_t<_Vp> __it) |
| 3943 | { |
| 3944 | auto [__b, __e] = ranges::search(subrange(__it, ranges::end(_M_base)), _M_pattern); |
| 3945 | if (__b != ranges::end(_M_base) && ranges::empty(_M_pattern)) |
| 3946 | { |
| 3947 | ++__b; |
| 3948 | ++__e; |
| 3949 | } |
| 3950 | return {__b, __e}; |
| 3951 | } |
| 3952 | |
| 3953 | private: |
| 3954 | struct _Iterator |
| 3955 | { |
| 3956 | private: |
| 3957 | split_view* _M_parent = nullptr; |
| 3958 | iterator_t<_Vp> _M_cur = iterator_t<_Vp>(); |
| 3959 | subrange<iterator_t<_Vp>> _M_next = subrange<iterator_t<_Vp>>(); |
| 3960 | bool _M_trailing_empty = false; |
| 3961 | |
| 3962 | friend struct _Sentinel; |
| 3963 | |
| 3964 | public: |
| 3965 | using iterator_concept = forward_iterator_tag; |
| 3966 | using iterator_category = input_iterator_tag; |
| 3967 | using value_type = subrange<iterator_t<_Vp>>; |
| 3968 | using difference_type = range_difference_t<_Vp>; |
| 3969 | |
| 3970 | _Iterator() = default; |
| 3971 | |
| 3972 | constexpr |
| 3973 | _Iterator(split_view* __parent, |
| 3974 | iterator_t<_Vp> __current, |
| 3975 | subrange<iterator_t<_Vp>> __next) |
| 3976 | : _M_parent(__parent), |
| 3977 | _M_cur(std::move(__current)), |
| 3978 | _M_next(std::move(__next)) |
| 3979 | { } |
| 3980 | |
| 3981 | constexpr iterator_t<_Vp> |
| 3982 | base() const |
| 3983 | { return _M_cur; } |
| 3984 | |
| 3985 | constexpr value_type |
| 3986 | operator*() const |
| 3987 | { return {_M_cur, _M_next.begin()}; } |
| 3988 | |
| 3989 | constexpr _Iterator& |
| 3990 | operator++() |
| 3991 | { |
| 3992 | _M_cur = _M_next.begin(); |
| 3993 | if (_M_cur != ranges::end(_M_parent->_M_base)) |
| 3994 | { |
| 3995 | _M_cur = _M_next.end(); |
| 3996 | if (_M_cur == ranges::end(_M_parent->_M_base)) |
| 3997 | { |
| 3998 | _M_trailing_empty = true; |
| 3999 | _M_next = {_M_cur, _M_cur}; |
| 4000 | } |
| 4001 | else |
| 4002 | _M_next = _M_parent->_M_find_next(it: _M_cur); |
| 4003 | } |
| 4004 | else |
| 4005 | _M_trailing_empty = false; |
| 4006 | return *this; |
| 4007 | } |
| 4008 | |
| 4009 | constexpr _Iterator |
| 4010 | operator++(int) |
| 4011 | { |
| 4012 | auto __tmp = *this; |
| 4013 | ++*this; |
| 4014 | return __tmp; |
| 4015 | } |
| 4016 | |
| 4017 | friend constexpr bool |
| 4018 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 4019 | { |
| 4020 | return __x._M_cur == __y._M_cur |
| 4021 | && __x._M_trailing_empty == __y._M_trailing_empty; |
| 4022 | } |
| 4023 | }; |
| 4024 | |
| 4025 | struct _Sentinel |
| 4026 | { |
| 4027 | private: |
| 4028 | sentinel_t<_Vp> _M_end = sentinel_t<_Vp>(); |
| 4029 | |
| 4030 | public: |
| 4031 | _Sentinel() = default; |
| 4032 | |
| 4033 | constexpr explicit |
| 4034 | _Sentinel(split_view* __parent) |
| 4035 | : _M_end(ranges::end(__parent->_M_base)) |
| 4036 | { } |
| 4037 | |
| 4038 | friend constexpr bool |
| 4039 | operator==(const _Iterator& __x, const _Sentinel& __y) |
| 4040 | { return __x._M_cur == __y._M_end && !__x._M_trailing_empty; } |
| 4041 | }; |
| 4042 | }; |
| 4043 | |
| 4044 | template<typename _Range, typename _Pattern> |
| 4045 | split_view(_Range&&, _Pattern&&) |
| 4046 | -> split_view<views::all_t<_Range>, views::all_t<_Pattern>>; |
| 4047 | |
| 4048 | template<forward_range _Range> |
| 4049 | split_view(_Range&&, range_value_t<_Range>) |
| 4050 | -> split_view<views::all_t<_Range>, single_view<range_value_t<_Range>>>; |
| 4051 | |
| 4052 | namespace views |
| 4053 | { |
| 4054 | namespace __detail |
| 4055 | { |
| 4056 | template<typename _Range, typename _Pattern> |
| 4057 | concept __can_split_view |
| 4058 | = requires { split_view(std::declval<_Range>(), std::declval<_Pattern>()); }; |
| 4059 | } // namespace __detail |
| 4060 | |
| 4061 | struct _Split : __adaptor::_RangeAdaptor<_Split> |
| 4062 | { |
| 4063 | template<viewable_range _Range, typename _Pattern> |
| 4064 | requires __detail::__can_split_view<_Range, _Pattern> |
| 4065 | constexpr auto |
| 4066 | operator() [[nodiscard]] (_Range&& __r, _Pattern&& __f) const |
| 4067 | { |
| 4068 | return split_view(std::forward<_Range>(__r), std::forward<_Pattern>(__f)); |
| 4069 | } |
| 4070 | |
| 4071 | using _RangeAdaptor<_Split>::operator(); |
| 4072 | static constexpr int _S_arity = 2; |
| 4073 | template<typename _Pattern> |
| 4074 | static constexpr bool _S_has_simple_extra_args |
| 4075 | = _LazySplit::_S_has_simple_extra_args<_Pattern>; |
| 4076 | }; |
| 4077 | |
| 4078 | inline constexpr _Split split; |
| 4079 | } // namespace views |
| 4080 | |
| 4081 | namespace views |
| 4082 | { |
| 4083 | struct _Counted |
| 4084 | { |
| 4085 | template<input_or_output_iterator _Iter> |
| 4086 | constexpr auto |
| 4087 | operator() [[nodiscard]] (_Iter __i, iter_difference_t<_Iter> __n) const |
| 4088 | { |
| 4089 | if constexpr (contiguous_iterator<_Iter>) |
| 4090 | return span(std::to_address(__i), __n); |
| 4091 | else if constexpr (random_access_iterator<_Iter>) |
| 4092 | return subrange(__i, __i + __n); |
| 4093 | else |
| 4094 | return subrange(counted_iterator(std::move(__i), __n), |
| 4095 | default_sentinel); |
| 4096 | } |
| 4097 | }; |
| 4098 | |
| 4099 | inline constexpr _Counted counted{}; |
| 4100 | } // namespace views |
| 4101 | |
| 4102 | template<view _Vp> |
| 4103 | requires (!common_range<_Vp>) && copyable<iterator_t<_Vp>> |
| 4104 | class common_view : public view_interface<common_view<_Vp>> |
| 4105 | { |
| 4106 | private: |
| 4107 | _Vp _M_base = _Vp(); |
| 4108 | |
| 4109 | public: |
| 4110 | common_view() requires default_initializable<_Vp> = default; |
| 4111 | |
| 4112 | constexpr explicit |
| 4113 | common_view(_Vp __r) |
| 4114 | : _M_base(std::move(__r)) |
| 4115 | { } |
| 4116 | |
| 4117 | constexpr _Vp |
| 4118 | base() const& requires copy_constructible<_Vp> |
| 4119 | { return _M_base; } |
| 4120 | |
| 4121 | constexpr _Vp |
| 4122 | base() && |
| 4123 | { return std::move(_M_base); } |
| 4124 | |
| 4125 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4126 | // 4012. common_view::begin/end are missing the simple-view check |
| 4127 | constexpr auto |
| 4128 | begin() requires (!__detail::__simple_view<_Vp>) |
| 4129 | { |
| 4130 | if constexpr (random_access_range<_Vp> && sized_range<_Vp>) |
| 4131 | return ranges::begin(_M_base); |
| 4132 | else |
| 4133 | return common_iterator<iterator_t<_Vp>, sentinel_t<_Vp>> |
| 4134 | (ranges::begin(_M_base)); |
| 4135 | } |
| 4136 | |
| 4137 | constexpr auto |
| 4138 | begin() const requires range<const _Vp> |
| 4139 | { |
| 4140 | if constexpr (random_access_range<const _Vp> && sized_range<const _Vp>) |
| 4141 | return ranges::begin(_M_base); |
| 4142 | else |
| 4143 | return common_iterator<iterator_t<const _Vp>, sentinel_t<const _Vp>> |
| 4144 | (ranges::begin(_M_base)); |
| 4145 | } |
| 4146 | |
| 4147 | constexpr auto |
| 4148 | end() requires (!__detail::__simple_view<_Vp>) |
| 4149 | { |
| 4150 | if constexpr (random_access_range<_Vp> && sized_range<_Vp>) |
| 4151 | return ranges::begin(_M_base) + ranges::size(_M_base); |
| 4152 | else |
| 4153 | return common_iterator<iterator_t<_Vp>, sentinel_t<_Vp>> |
| 4154 | (ranges::end(_M_base)); |
| 4155 | } |
| 4156 | |
| 4157 | constexpr auto |
| 4158 | end() const requires range<const _Vp> |
| 4159 | { |
| 4160 | if constexpr (random_access_range<const _Vp> && sized_range<const _Vp>) |
| 4161 | return ranges::begin(_M_base) + ranges::size(_M_base); |
| 4162 | else |
| 4163 | return common_iterator<iterator_t<const _Vp>, sentinel_t<const _Vp>> |
| 4164 | (ranges::end(_M_base)); |
| 4165 | } |
| 4166 | |
| 4167 | constexpr auto |
| 4168 | size() requires sized_range<_Vp> |
| 4169 | { return ranges::size(_M_base); } |
| 4170 | |
| 4171 | constexpr auto |
| 4172 | size() const requires sized_range<const _Vp> |
| 4173 | { return ranges::size(_M_base); } |
| 4174 | }; |
| 4175 | |
| 4176 | template<typename _Range> |
| 4177 | common_view(_Range&&) -> common_view<views::all_t<_Range>>; |
| 4178 | |
| 4179 | template<typename _Tp> |
| 4180 | inline constexpr bool enable_borrowed_range<common_view<_Tp>> |
| 4181 | = enable_borrowed_range<_Tp>; |
| 4182 | |
| 4183 | namespace views |
| 4184 | { |
| 4185 | namespace __detail |
| 4186 | { |
| 4187 | template<typename _Range> |
| 4188 | concept __already_common = common_range<_Range> |
| 4189 | && requires { views::all(std::declval<_Range>()); }; |
| 4190 | |
| 4191 | template<typename _Range> |
| 4192 | concept __can_common_view |
| 4193 | = requires { common_view{std::declval<_Range>()}; }; |
| 4194 | } // namespace __detail |
| 4195 | |
| 4196 | struct _Common : __adaptor::_RangeAdaptorClosure<_Common> |
| 4197 | { |
| 4198 | template<viewable_range _Range> |
| 4199 | requires __detail::__already_common<_Range> |
| 4200 | || __detail::__can_common_view<_Range> |
| 4201 | constexpr auto |
| 4202 | operator() [[nodiscard]] (_Range&& __r) const |
| 4203 | { |
| 4204 | if constexpr (__detail::__already_common<_Range>) |
| 4205 | return views::all(std::forward<_Range>(__r)); |
| 4206 | else |
| 4207 | return common_view{std::forward<_Range>(__r)}; |
| 4208 | } |
| 4209 | |
| 4210 | static constexpr bool _S_has_simple_call_op = true; |
| 4211 | }; |
| 4212 | |
| 4213 | inline constexpr _Common common; |
| 4214 | } // namespace views |
| 4215 | |
| 4216 | template<view _Vp> |
| 4217 | requires bidirectional_range<_Vp> |
| 4218 | class reverse_view : public view_interface<reverse_view<_Vp>> |
| 4219 | { |
| 4220 | private: |
| 4221 | static constexpr bool _S_needs_cached_begin |
| 4222 | = !common_range<_Vp> && !(random_access_range<_Vp> |
| 4223 | && sized_sentinel_for<sentinel_t<_Vp>, |
| 4224 | iterator_t<_Vp>>); |
| 4225 | |
| 4226 | _Vp _M_base = _Vp(); |
| 4227 | [[no_unique_address]] |
| 4228 | __detail::__maybe_present_t<_S_needs_cached_begin, |
| 4229 | __detail::_CachedPosition<_Vp>> |
| 4230 | _M_cached_begin; |
| 4231 | |
| 4232 | public: |
| 4233 | reverse_view() requires default_initializable<_Vp> = default; |
| 4234 | |
| 4235 | constexpr explicit |
| 4236 | reverse_view(_Vp __r) |
| 4237 | : _M_base(std::move(__r)) |
| 4238 | { } |
| 4239 | |
| 4240 | constexpr _Vp |
| 4241 | base() const& requires copy_constructible<_Vp> |
| 4242 | { return _M_base; } |
| 4243 | |
| 4244 | constexpr _Vp |
| 4245 | base() && |
| 4246 | { return std::move(_M_base); } |
| 4247 | |
| 4248 | constexpr reverse_iterator<iterator_t<_Vp>> |
| 4249 | begin() |
| 4250 | { |
| 4251 | if constexpr (_S_needs_cached_begin) |
| 4252 | if (_M_cached_begin._M_has_value()) |
| 4253 | return std::make_reverse_iterator(_M_cached_begin._M_get(_M_base)); |
| 4254 | |
| 4255 | auto __it = ranges::next(ranges::begin(_M_base), ranges::end(_M_base)); |
| 4256 | if constexpr (_S_needs_cached_begin) |
| 4257 | _M_cached_begin._M_set(_M_base, __it); |
| 4258 | return std::make_reverse_iterator(std::move(__it)); |
| 4259 | } |
| 4260 | |
| 4261 | constexpr auto |
| 4262 | begin() requires common_range<_Vp> |
| 4263 | { return std::make_reverse_iterator(ranges::end(_M_base)); } |
| 4264 | |
| 4265 | constexpr auto |
| 4266 | begin() const requires common_range<const _Vp> |
| 4267 | { return std::make_reverse_iterator(ranges::end(_M_base)); } |
| 4268 | |
| 4269 | constexpr reverse_iterator<iterator_t<_Vp>> |
| 4270 | end() |
| 4271 | { return std::make_reverse_iterator(ranges::begin(_M_base)); } |
| 4272 | |
| 4273 | constexpr auto |
| 4274 | end() const requires common_range<const _Vp> |
| 4275 | { return std::make_reverse_iterator(ranges::begin(_M_base)); } |
| 4276 | |
| 4277 | constexpr auto |
| 4278 | size() requires sized_range<_Vp> |
| 4279 | { return ranges::size(_M_base); } |
| 4280 | |
| 4281 | constexpr auto |
| 4282 | size() const requires sized_range<const _Vp> |
| 4283 | { return ranges::size(_M_base); } |
| 4284 | }; |
| 4285 | |
| 4286 | template<typename _Range> |
| 4287 | reverse_view(_Range&&) -> reverse_view<views::all_t<_Range>>; |
| 4288 | |
| 4289 | template<typename _Tp> |
| 4290 | inline constexpr bool enable_borrowed_range<reverse_view<_Tp>> |
| 4291 | = enable_borrowed_range<_Tp>; |
| 4292 | |
| 4293 | namespace views |
| 4294 | { |
| 4295 | namespace __detail |
| 4296 | { |
| 4297 | template<typename> |
| 4298 | inline constexpr bool __is_reversible_subrange = false; |
| 4299 | |
| 4300 | template<typename _Iter, subrange_kind _Kind> |
| 4301 | inline constexpr bool |
| 4302 | __is_reversible_subrange<subrange<reverse_iterator<_Iter>, |
| 4303 | reverse_iterator<_Iter>, |
| 4304 | _Kind>> = true; |
| 4305 | |
| 4306 | template<typename> |
| 4307 | inline constexpr bool __is_reverse_view = false; |
| 4308 | |
| 4309 | template<typename _Vp> |
| 4310 | inline constexpr bool __is_reverse_view<reverse_view<_Vp>> = true; |
| 4311 | |
| 4312 | template<typename _Range> |
| 4313 | concept __can_reverse_view |
| 4314 | = requires { reverse_view{std::declval<_Range>()}; }; |
| 4315 | } // namespace __detail |
| 4316 | |
| 4317 | struct _Reverse : __adaptor::_RangeAdaptorClosure<_Reverse> |
| 4318 | { |
| 4319 | template<viewable_range _Range> |
| 4320 | requires __detail::__is_reverse_view<remove_cvref_t<_Range>> |
| 4321 | || __detail::__is_reversible_subrange<remove_cvref_t<_Range>> |
| 4322 | || __detail::__can_reverse_view<_Range> |
| 4323 | constexpr auto |
| 4324 | operator() [[nodiscard]] (_Range&& __r) const |
| 4325 | { |
| 4326 | using _Tp = remove_cvref_t<_Range>; |
| 4327 | if constexpr (__detail::__is_reverse_view<_Tp>) |
| 4328 | return std::forward<_Range>(__r).base(); |
| 4329 | #ifdef __cpp_lib_optional_range_support // >= C++26 |
| 4330 | else if constexpr (__is_optional_v<_Tp> && view<_Tp>) |
| 4331 | return std::forward<_Range>(__r); |
| 4332 | #endif |
| 4333 | else if constexpr (__detail::__is_reversible_subrange<_Tp>) |
| 4334 | { |
| 4335 | using _Iter = decltype(ranges::begin(__r).base()); |
| 4336 | if constexpr (sized_range<_Tp>) |
| 4337 | return subrange<_Iter, _Iter, subrange_kind::sized> |
| 4338 | {__r.end().base(), __r.begin().base(), __r.size()}; |
| 4339 | else |
| 4340 | return subrange<_Iter, _Iter, subrange_kind::unsized> |
| 4341 | {__r.end().base(), __r.begin().base()}; |
| 4342 | } |
| 4343 | else |
| 4344 | return reverse_view{std::forward<_Range>(__r)}; |
| 4345 | } |
| 4346 | |
| 4347 | static constexpr bool _S_has_simple_call_op = true; |
| 4348 | }; |
| 4349 | |
| 4350 | inline constexpr _Reverse reverse; |
| 4351 | } // namespace views |
| 4352 | |
| 4353 | namespace __detail |
| 4354 | { |
| 4355 | #if __cpp_lib_tuple_like // >= C++23 |
| 4356 | template<typename _Tp, size_t _Nm> |
| 4357 | concept __has_tuple_element = __tuple_like<_Tp> && _Nm < tuple_size_v<_Tp>; |
| 4358 | #else |
| 4359 | template<typename _Tp, size_t _Nm> |
| 4360 | concept __has_tuple_element = requires(_Tp __t) |
| 4361 | { |
| 4362 | typename tuple_size<_Tp>::type; |
| 4363 | requires _Nm < tuple_size_v<_Tp>; |
| 4364 | typename tuple_element_t<_Nm, _Tp>; |
| 4365 | { std::get<_Nm>(__t) } |
| 4366 | -> convertible_to<const tuple_element_t<_Nm, _Tp>&>; |
| 4367 | }; |
| 4368 | #endif |
| 4369 | |
| 4370 | template<typename _Tp, size_t _Nm> |
| 4371 | concept __returnable_element |
| 4372 | = is_reference_v<_Tp> || move_constructible<tuple_element_t<_Nm, _Tp>>; |
| 4373 | } |
| 4374 | |
| 4375 | template<input_range _Vp, size_t _Nm> |
| 4376 | requires view<_Vp> |
| 4377 | && __detail::__has_tuple_element<range_value_t<_Vp>, _Nm> |
| 4378 | && __detail::__has_tuple_element<remove_reference_t<range_reference_t<_Vp>>, |
| 4379 | _Nm> |
| 4380 | && __detail::__returnable_element<range_reference_t<_Vp>, _Nm> |
| 4381 | class elements_view : public view_interface<elements_view<_Vp, _Nm>> |
| 4382 | { |
| 4383 | public: |
| 4384 | elements_view() requires default_initializable<_Vp> = default; |
| 4385 | |
| 4386 | constexpr explicit |
| 4387 | elements_view(_Vp __base) |
| 4388 | : _M_base(std::move(__base)) |
| 4389 | { } |
| 4390 | |
| 4391 | constexpr _Vp |
| 4392 | base() const& requires copy_constructible<_Vp> |
| 4393 | { return _M_base; } |
| 4394 | |
| 4395 | constexpr _Vp |
| 4396 | base() && |
| 4397 | { return std::move(_M_base); } |
| 4398 | |
| 4399 | constexpr auto |
| 4400 | begin() requires (!__detail::__simple_view<_Vp>) |
| 4401 | { return _Iterator<false>(ranges::begin(_M_base)); } |
| 4402 | |
| 4403 | constexpr auto |
| 4404 | begin() const requires range<const _Vp> |
| 4405 | { return _Iterator<true>(ranges::begin(_M_base)); } |
| 4406 | |
| 4407 | constexpr auto |
| 4408 | end() requires (!__detail::__simple_view<_Vp> && !common_range<_Vp>) |
| 4409 | { return _Sentinel<false>{ranges::end(_M_base)}; } |
| 4410 | |
| 4411 | constexpr auto |
| 4412 | end() requires (!__detail::__simple_view<_Vp> && common_range<_Vp>) |
| 4413 | { return _Iterator<false>{ranges::end(_M_base)}; } |
| 4414 | |
| 4415 | constexpr auto |
| 4416 | end() const requires range<const _Vp> |
| 4417 | { return _Sentinel<true>{ranges::end(_M_base)}; } |
| 4418 | |
| 4419 | constexpr auto |
| 4420 | end() const requires common_range<const _Vp> |
| 4421 | { return _Iterator<true>{ranges::end(_M_base)}; } |
| 4422 | |
| 4423 | constexpr auto |
| 4424 | size() requires sized_range<_Vp> |
| 4425 | { return ranges::size(_M_base); } |
| 4426 | |
| 4427 | constexpr auto |
| 4428 | size() const requires sized_range<const _Vp> |
| 4429 | { return ranges::size(_M_base); } |
| 4430 | |
| 4431 | private: |
| 4432 | template<bool _Const> |
| 4433 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 4434 | |
| 4435 | template<bool _Const> |
| 4436 | struct __iter_cat |
| 4437 | { }; |
| 4438 | |
| 4439 | template<bool _Const> |
| 4440 | requires forward_range<_Base<_Const>> |
| 4441 | struct __iter_cat<_Const> |
| 4442 | { |
| 4443 | private: |
| 4444 | static auto _S_iter_cat() |
| 4445 | { |
| 4446 | using _Base = elements_view::_Base<_Const>; |
| 4447 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 4448 | using _Res = decltype((std::get<_Nm>(*std::declval<iterator_t<_Base>>()))); |
| 4449 | if constexpr (!is_lvalue_reference_v<_Res>) |
| 4450 | return input_iterator_tag{}; |
| 4451 | else if constexpr (derived_from<_Cat, random_access_iterator_tag>) |
| 4452 | return random_access_iterator_tag{}; |
| 4453 | else |
| 4454 | return _Cat{}; |
| 4455 | } |
| 4456 | public: |
| 4457 | using iterator_category = decltype(_S_iter_cat()); |
| 4458 | }; |
| 4459 | |
| 4460 | template<bool _Const> |
| 4461 | struct _Sentinel; |
| 4462 | |
| 4463 | template<bool _Const> |
| 4464 | struct _Iterator : __iter_cat<_Const> |
| 4465 | { |
| 4466 | private: |
| 4467 | using _Base = elements_view::_Base<_Const>; |
| 4468 | |
| 4469 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 4470 | |
| 4471 | static constexpr decltype(auto) |
| 4472 | _S_get_element(const iterator_t<_Base>& __i) |
| 4473 | { |
| 4474 | if constexpr (is_reference_v<range_reference_t<_Base>>) |
| 4475 | return std::get<_Nm>(*__i); |
| 4476 | else |
| 4477 | { |
| 4478 | using _Et = remove_cv_t<tuple_element_t<_Nm, range_reference_t<_Base>>>; |
| 4479 | return static_cast<_Et>(std::get<_Nm>(*__i)); |
| 4480 | } |
| 4481 | } |
| 4482 | |
| 4483 | static auto |
| 4484 | _S_iter_concept() |
| 4485 | { |
| 4486 | if constexpr (random_access_range<_Base>) |
| 4487 | return random_access_iterator_tag{}; |
| 4488 | else if constexpr (bidirectional_range<_Base>) |
| 4489 | return bidirectional_iterator_tag{}; |
| 4490 | else if constexpr (forward_range<_Base>) |
| 4491 | return forward_iterator_tag{}; |
| 4492 | else |
| 4493 | return input_iterator_tag{}; |
| 4494 | } |
| 4495 | |
| 4496 | friend _Iterator<!_Const>; |
| 4497 | |
| 4498 | public: |
| 4499 | using iterator_concept = decltype(_S_iter_concept()); |
| 4500 | // iterator_category defined in elements_view::__iter_cat |
| 4501 | using value_type |
| 4502 | = remove_cvref_t<tuple_element_t<_Nm, range_value_t<_Base>>>; |
| 4503 | using difference_type = range_difference_t<_Base>; |
| 4504 | |
| 4505 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 4506 | |
| 4507 | constexpr explicit |
| 4508 | _Iterator(iterator_t<_Base> __current) |
| 4509 | : _M_current(std::move(__current)) |
| 4510 | { } |
| 4511 | |
| 4512 | constexpr |
| 4513 | _Iterator(_Iterator<!_Const> __i) |
| 4514 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 4515 | : _M_current(std::move(__i._M_current)) |
| 4516 | { } |
| 4517 | |
| 4518 | constexpr const iterator_t<_Base>& |
| 4519 | base() const& noexcept |
| 4520 | { return _M_current; } |
| 4521 | |
| 4522 | constexpr iterator_t<_Base> |
| 4523 | base() && |
| 4524 | { return std::move(_M_current); } |
| 4525 | |
| 4526 | constexpr decltype(auto) |
| 4527 | operator*() const |
| 4528 | { return _S_get_element(i: _M_current); } |
| 4529 | |
| 4530 | constexpr _Iterator& |
| 4531 | operator++() |
| 4532 | { |
| 4533 | ++_M_current; |
| 4534 | return *this; |
| 4535 | } |
| 4536 | |
| 4537 | constexpr void |
| 4538 | operator++(int) |
| 4539 | { ++_M_current; } |
| 4540 | |
| 4541 | constexpr _Iterator |
| 4542 | operator++(int) requires forward_range<_Base> |
| 4543 | { |
| 4544 | auto __tmp = *this; |
| 4545 | ++_M_current; |
| 4546 | return __tmp; |
| 4547 | } |
| 4548 | |
| 4549 | constexpr _Iterator& |
| 4550 | operator--() requires bidirectional_range<_Base> |
| 4551 | { |
| 4552 | --_M_current; |
| 4553 | return *this; |
| 4554 | } |
| 4555 | |
| 4556 | constexpr _Iterator |
| 4557 | operator--(int) requires bidirectional_range<_Base> |
| 4558 | { |
| 4559 | auto __tmp = *this; |
| 4560 | --_M_current; |
| 4561 | return __tmp; |
| 4562 | } |
| 4563 | |
| 4564 | constexpr _Iterator& |
| 4565 | operator+=(difference_type __n) |
| 4566 | requires random_access_range<_Base> |
| 4567 | { |
| 4568 | _M_current += __n; |
| 4569 | return *this; |
| 4570 | } |
| 4571 | |
| 4572 | constexpr _Iterator& |
| 4573 | operator-=(difference_type __n) |
| 4574 | requires random_access_range<_Base> |
| 4575 | { |
| 4576 | _M_current -= __n; |
| 4577 | return *this; |
| 4578 | } |
| 4579 | |
| 4580 | constexpr decltype(auto) |
| 4581 | operator[](difference_type __n) const |
| 4582 | requires random_access_range<_Base> |
| 4583 | { return _S_get_element(i: _M_current + __n); } |
| 4584 | |
| 4585 | friend constexpr bool |
| 4586 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 4587 | requires equality_comparable<iterator_t<_Base>> |
| 4588 | { return __x._M_current == __y._M_current; } |
| 4589 | |
| 4590 | friend constexpr bool |
| 4591 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 4592 | requires random_access_range<_Base> |
| 4593 | { return __x._M_current < __y._M_current; } |
| 4594 | |
| 4595 | friend constexpr bool |
| 4596 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 4597 | requires random_access_range<_Base> |
| 4598 | { return __y._M_current < __x._M_current; } |
| 4599 | |
| 4600 | friend constexpr bool |
| 4601 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 4602 | requires random_access_range<_Base> |
| 4603 | { return !(__y._M_current > __x._M_current); } |
| 4604 | |
| 4605 | friend constexpr bool |
| 4606 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 4607 | requires random_access_range<_Base> |
| 4608 | { return !(__x._M_current > __y._M_current); } |
| 4609 | |
| 4610 | #ifdef __cpp_lib_three_way_comparison |
| 4611 | friend constexpr auto |
| 4612 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 4613 | requires random_access_range<_Base> |
| 4614 | && three_way_comparable<iterator_t<_Base>> |
| 4615 | { return __x._M_current <=> __y._M_current; } |
| 4616 | #endif |
| 4617 | |
| 4618 | friend constexpr _Iterator |
| 4619 | operator+(const _Iterator& __x, difference_type __y) |
| 4620 | requires random_access_range<_Base> |
| 4621 | { return _Iterator{__x} += __y; } |
| 4622 | |
| 4623 | friend constexpr _Iterator |
| 4624 | operator+(difference_type __x, const _Iterator& __y) |
| 4625 | requires random_access_range<_Base> |
| 4626 | { return __y + __x; } |
| 4627 | |
| 4628 | friend constexpr _Iterator |
| 4629 | operator-(const _Iterator& __x, difference_type __y) |
| 4630 | requires random_access_range<_Base> |
| 4631 | { return _Iterator{__x} -= __y; } |
| 4632 | |
| 4633 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4634 | // 3483. transform_view::iterator's difference is overconstrained |
| 4635 | friend constexpr difference_type |
| 4636 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 4637 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 4638 | { return __x._M_current - __y._M_current; } |
| 4639 | |
| 4640 | template <bool> friend struct _Sentinel; |
| 4641 | }; |
| 4642 | |
| 4643 | template<bool _Const> |
| 4644 | struct _Sentinel |
| 4645 | { |
| 4646 | private: |
| 4647 | using _Base = elements_view::_Base<_Const>; |
| 4648 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 4649 | |
| 4650 | public: |
| 4651 | _Sentinel() = default; |
| 4652 | |
| 4653 | constexpr explicit |
| 4654 | _Sentinel(sentinel_t<_Base> __end) |
| 4655 | : _M_end(std::move(__end)) |
| 4656 | { } |
| 4657 | |
| 4658 | constexpr |
| 4659 | _Sentinel(_Sentinel<!_Const> __other) |
| 4660 | requires _Const |
| 4661 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 4662 | : _M_end(std::move(__other._M_end)) |
| 4663 | { } |
| 4664 | |
| 4665 | constexpr sentinel_t<_Base> |
| 4666 | base() const |
| 4667 | { return _M_end; } |
| 4668 | |
| 4669 | template<bool _Const2> |
| 4670 | requires sentinel_for<sentinel_t<_Base>, |
| 4671 | iterator_t<__detail::__maybe_const_t<_Const2, _Vp>>> |
| 4672 | friend constexpr bool |
| 4673 | operator==(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 4674 | { return __x._M_current == __y._M_end; } |
| 4675 | |
| 4676 | template<bool _Const2, |
| 4677 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 4678 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 4679 | friend constexpr range_difference_t<_Base2> |
| 4680 | operator-(const _Iterator<_Const2>& __x, const _Sentinel& __y) |
| 4681 | { return -(__y._M_end - __x._M_current); } |
| 4682 | |
| 4683 | template<bool _Const2, |
| 4684 | typename _Base2 = __detail::__maybe_const_t<_Const2, _Vp>> |
| 4685 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base2>> |
| 4686 | friend constexpr range_difference_t<_Base2> |
| 4687 | operator-(const _Sentinel& __x, const _Iterator<_Const2>& __y) |
| 4688 | { return __x._M_end - __y._M_current; } |
| 4689 | |
| 4690 | friend _Sentinel<!_Const>; |
| 4691 | }; |
| 4692 | |
| 4693 | _Vp _M_base = _Vp(); |
| 4694 | }; |
| 4695 | |
| 4696 | template<typename _Tp, size_t _Nm> |
| 4697 | inline constexpr bool enable_borrowed_range<elements_view<_Tp, _Nm>> |
| 4698 | = enable_borrowed_range<_Tp>; |
| 4699 | |
| 4700 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 4701 | // 3563. keys_view example is broken |
| 4702 | template<typename _Range> |
| 4703 | using keys_view = elements_view<_Range, 0>; |
| 4704 | |
| 4705 | template<typename _Range> |
| 4706 | using values_view = elements_view<_Range, 1>; |
| 4707 | |
| 4708 | namespace views |
| 4709 | { |
| 4710 | namespace __detail |
| 4711 | { |
| 4712 | template<size_t _Nm, typename _Range> |
| 4713 | concept __can_elements_view |
| 4714 | = requires { elements_view<all_t<_Range>, _Nm>{std::declval<_Range>()}; }; |
| 4715 | } // namespace __detail |
| 4716 | |
| 4717 | template<size_t _Nm> |
| 4718 | struct _Elements : __adaptor::_RangeAdaptorClosure<_Elements<_Nm>> |
| 4719 | { |
| 4720 | template<viewable_range _Range> |
| 4721 | requires __detail::__can_elements_view<_Nm, _Range> |
| 4722 | constexpr auto |
| 4723 | operator() [[nodiscard]] (_Range&& __r) const |
| 4724 | { |
| 4725 | return elements_view<all_t<_Range>, _Nm>{std::forward<_Range>(__r)}; |
| 4726 | } |
| 4727 | |
| 4728 | static constexpr bool _S_has_simple_call_op = true; |
| 4729 | }; |
| 4730 | |
| 4731 | template<size_t _Nm> |
| 4732 | inline constexpr _Elements<_Nm> elements; |
| 4733 | inline constexpr auto keys = elements<0>; |
| 4734 | inline constexpr auto values = elements<1>; |
| 4735 | } // namespace views |
| 4736 | |
| 4737 | #ifdef __cpp_lib_ranges_zip // C++ >= 23 |
| 4738 | namespace __detail |
| 4739 | { |
| 4740 | template<typename... _Rs> |
| 4741 | concept __zip_is_common = (sizeof...(_Rs) == 1 && (common_range<_Rs> && ...)) |
| 4742 | || (!(bidirectional_range<_Rs> && ...) && (common_range<_Rs> && ...)) |
| 4743 | || ((random_access_range<_Rs> && ...) && (sized_range<_Rs> && ...)); |
| 4744 | |
| 4745 | template<typename _Fp, typename _Tuple> |
| 4746 | constexpr auto |
| 4747 | __tuple_transform(_Fp&& __f, _Tuple&& __tuple) |
| 4748 | { |
| 4749 | return std::apply([&]<typename... _Ts>(_Ts&&... __elts) { |
| 4750 | return tuple<invoke_result_t<_Fp&, _Ts>...> |
| 4751 | (std::__invoke(__f, std::forward<_Ts>(__elts))...); |
| 4752 | }, std::forward<_Tuple>(__tuple)); |
| 4753 | } |
| 4754 | |
| 4755 | template<typename _Fp, typename _Tuple> |
| 4756 | constexpr void |
| 4757 | __tuple_for_each(_Fp&& __f, _Tuple&& __tuple) |
| 4758 | { |
| 4759 | std::apply([&]<typename... _Ts>(_Ts&&... __elts) { |
| 4760 | (std::__invoke(__f, std::forward<_Ts>(__elts)), ...); |
| 4761 | }, std::forward<_Tuple>(__tuple)); |
| 4762 | } |
| 4763 | } // namespace __detail |
| 4764 | |
| 4765 | template<input_range... _Vs> |
| 4766 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) |
| 4767 | class zip_view : public view_interface<zip_view<_Vs...>> |
| 4768 | { |
| 4769 | tuple<_Vs...> _M_views; |
| 4770 | |
| 4771 | template<bool> class _Iterator; |
| 4772 | template<bool> class _Sentinel; |
| 4773 | |
| 4774 | public: |
| 4775 | zip_view() = default; |
| 4776 | |
| 4777 | constexpr explicit |
| 4778 | zip_view(_Vs... __views) |
| 4779 | : _M_views(std::move(__views)...) |
| 4780 | { } |
| 4781 | |
| 4782 | constexpr auto |
| 4783 | begin() requires (!(__detail::__simple_view<_Vs> && ...)) |
| 4784 | { return _Iterator<false>(__detail::__tuple_transform(ranges::begin, _M_views)); } |
| 4785 | |
| 4786 | constexpr auto |
| 4787 | begin() const requires (range<const _Vs> && ...) |
| 4788 | { return _Iterator<true>(__detail::__tuple_transform(ranges::begin, _M_views)); } |
| 4789 | |
| 4790 | constexpr auto |
| 4791 | end() requires (!(__detail::__simple_view<_Vs> && ...)) |
| 4792 | { |
| 4793 | if constexpr (!__detail::__zip_is_common<_Vs...>) |
| 4794 | return _Sentinel<false>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4795 | else if constexpr ((random_access_range<_Vs> && ...)) |
| 4796 | return begin() + iter_difference_t<_Iterator<false>>(size()); |
| 4797 | else |
| 4798 | return _Iterator<false>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4799 | } |
| 4800 | |
| 4801 | constexpr auto |
| 4802 | end() const requires (range<const _Vs> && ...) |
| 4803 | { |
| 4804 | if constexpr (!__detail::__zip_is_common<const _Vs...>) |
| 4805 | return _Sentinel<true>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4806 | else if constexpr ((random_access_range<const _Vs> && ...)) |
| 4807 | return begin() + iter_difference_t<_Iterator<true>>(size()); |
| 4808 | else |
| 4809 | return _Iterator<true>(__detail::__tuple_transform(ranges::end, _M_views)); |
| 4810 | } |
| 4811 | |
| 4812 | constexpr auto |
| 4813 | size() requires (sized_range<_Vs> && ...) |
| 4814 | { |
| 4815 | return std::apply([](auto... __sizes) { |
| 4816 | using _CT = __detail::__make_unsigned_like_t<common_type_t<decltype(__sizes)...>>; |
| 4817 | return ranges::min({_CT(__sizes)...}); |
| 4818 | }, __detail::__tuple_transform(ranges::size, _M_views)); |
| 4819 | } |
| 4820 | |
| 4821 | constexpr auto |
| 4822 | size() const requires (sized_range<const _Vs> && ...) |
| 4823 | { |
| 4824 | return std::apply([](auto... __sizes) { |
| 4825 | using _CT = __detail::__make_unsigned_like_t<common_type_t<decltype(__sizes)...>>; |
| 4826 | return ranges::min({_CT(__sizes)...}); |
| 4827 | }, __detail::__tuple_transform(ranges::size, _M_views)); |
| 4828 | } |
| 4829 | }; |
| 4830 | |
| 4831 | template<typename... _Rs> |
| 4832 | zip_view(_Rs&&...) -> zip_view<views::all_t<_Rs>...>; |
| 4833 | |
| 4834 | template<typename... _Views> |
| 4835 | inline constexpr bool enable_borrowed_range<zip_view<_Views...>> |
| 4836 | = (enable_borrowed_range<_Views> && ...); |
| 4837 | |
| 4838 | namespace __detail |
| 4839 | { |
| 4840 | template<bool _Const, typename... _Vs> |
| 4841 | concept __all_random_access |
| 4842 | = (random_access_range<__maybe_const_t<_Const, _Vs>> && ...); |
| 4843 | |
| 4844 | template<bool _Const, typename... _Vs> |
| 4845 | concept __all_bidirectional |
| 4846 | = (bidirectional_range<__maybe_const_t<_Const, _Vs>> && ...); |
| 4847 | |
| 4848 | template<bool _Const, typename... _Vs> |
| 4849 | concept __all_forward |
| 4850 | = (forward_range<__maybe_const_t<_Const, _Vs>> && ...); |
| 4851 | |
| 4852 | template<bool _Const, typename... _Views> |
| 4853 | struct __zip_view_iter_cat |
| 4854 | { }; |
| 4855 | |
| 4856 | template<bool _Const, typename... _Views> |
| 4857 | requires __all_forward<_Const, _Views...> |
| 4858 | struct __zip_view_iter_cat<_Const, _Views...> |
| 4859 | { using iterator_category = input_iterator_tag; }; |
| 4860 | } // namespace __detail |
| 4861 | |
| 4862 | template<input_range... _Vs> |
| 4863 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) |
| 4864 | template<bool _Const> |
| 4865 | class zip_view<_Vs...>::_Iterator |
| 4866 | : public __detail::__zip_view_iter_cat<_Const, _Vs...> |
| 4867 | { |
| 4868 | #ifdef _GLIBCXX_CLANG // LLVM-61763 workaround |
| 4869 | public: |
| 4870 | #endif |
| 4871 | tuple<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>...> _M_current; |
| 4872 | |
| 4873 | constexpr explicit |
| 4874 | _Iterator(decltype(_M_current) __current) |
| 4875 | : _M_current(std::move(__current)) |
| 4876 | { } |
| 4877 | |
| 4878 | static auto |
| 4879 | _S_iter_concept() |
| 4880 | { |
| 4881 | if constexpr (__detail::__all_random_access<_Const, _Vs...>) |
| 4882 | return random_access_iterator_tag{}; |
| 4883 | else if constexpr (__detail::__all_bidirectional<_Const, _Vs...>) |
| 4884 | return bidirectional_iterator_tag{}; |
| 4885 | else if constexpr (__detail::__all_forward<_Const, _Vs...>) |
| 4886 | return forward_iterator_tag{}; |
| 4887 | else |
| 4888 | return input_iterator_tag{}; |
| 4889 | } |
| 4890 | |
| 4891 | #ifndef _GLIBCXX_CLANG // LLVM-61763 workaround |
| 4892 | template<move_constructible _Fp, input_range... _Ws> |
| 4893 | requires (view<_Ws> && ...) && (sizeof...(_Ws) > 0) && is_object_v<_Fp> |
| 4894 | && regular_invocable<_Fp&, range_reference_t<_Ws>...> |
| 4895 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Ws>...>> |
| 4896 | friend class zip_transform_view; |
| 4897 | #endif |
| 4898 | |
| 4899 | public: |
| 4900 | // iterator_category defined in __zip_view_iter_cat |
| 4901 | using iterator_concept = decltype(_S_iter_concept()); |
| 4902 | using value_type |
| 4903 | = tuple<range_value_t<__detail::__maybe_const_t<_Const, _Vs>>...>; |
| 4904 | using difference_type |
| 4905 | = common_type_t<range_difference_t<__detail::__maybe_const_t<_Const, _Vs>>...>; |
| 4906 | |
| 4907 | _Iterator() = default; |
| 4908 | |
| 4909 | constexpr |
| 4910 | _Iterator(_Iterator<!_Const> __i) |
| 4911 | requires _Const |
| 4912 | && (convertible_to<iterator_t<_Vs>, |
| 4913 | iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4914 | : _M_current(std::move(__i._M_current)) |
| 4915 | { } |
| 4916 | |
| 4917 | constexpr auto |
| 4918 | operator*() const |
| 4919 | { |
| 4920 | auto __f = [](auto& __i) -> decltype(auto) { |
| 4921 | return *__i; |
| 4922 | }; |
| 4923 | return __detail::__tuple_transform(__f, _M_current); |
| 4924 | } |
| 4925 | |
| 4926 | constexpr _Iterator& |
| 4927 | operator++() |
| 4928 | { |
| 4929 | __detail::__tuple_for_each([](auto& __i) { ++__i; }, _M_current); |
| 4930 | return *this; |
| 4931 | } |
| 4932 | |
| 4933 | constexpr void |
| 4934 | operator++(int) |
| 4935 | { ++*this; } |
| 4936 | |
| 4937 | constexpr _Iterator |
| 4938 | operator++(int) |
| 4939 | requires __detail::__all_forward<_Const, _Vs...> |
| 4940 | { |
| 4941 | auto __tmp = *this; |
| 4942 | ++*this; |
| 4943 | return __tmp; |
| 4944 | } |
| 4945 | |
| 4946 | constexpr _Iterator& |
| 4947 | operator--() |
| 4948 | requires __detail::__all_bidirectional<_Const, _Vs...> |
| 4949 | { |
| 4950 | __detail::__tuple_for_each([](auto& __i) { --__i; }, _M_current); |
| 4951 | return *this; |
| 4952 | } |
| 4953 | |
| 4954 | constexpr _Iterator |
| 4955 | operator--(int) |
| 4956 | requires __detail::__all_bidirectional<_Const, _Vs...> |
| 4957 | { |
| 4958 | auto __tmp = *this; |
| 4959 | --*this; |
| 4960 | return __tmp; |
| 4961 | } |
| 4962 | |
| 4963 | constexpr _Iterator& |
| 4964 | operator+=(difference_type __x) |
| 4965 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4966 | { |
| 4967 | auto __f = [&]<typename _It>(_It& __i) { |
| 4968 | __i += iter_difference_t<_It>(__x); |
| 4969 | }; |
| 4970 | __detail::__tuple_for_each(__f, _M_current); |
| 4971 | return *this; |
| 4972 | } |
| 4973 | |
| 4974 | constexpr _Iterator& |
| 4975 | operator-=(difference_type __x) |
| 4976 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4977 | { |
| 4978 | auto __f = [&]<typename _It>(_It& __i) { |
| 4979 | __i -= iter_difference_t<_It>(__x); |
| 4980 | }; |
| 4981 | __detail::__tuple_for_each(__f, _M_current); |
| 4982 | return *this; |
| 4983 | } |
| 4984 | |
| 4985 | constexpr auto |
| 4986 | operator[](difference_type __n) const |
| 4987 | requires __detail::__all_random_access<_Const, _Vs...> |
| 4988 | { |
| 4989 | auto __f = [&]<typename _It>(_It& __i) -> decltype(auto) { |
| 4990 | return __i[iter_difference_t<_It>(__n)]; |
| 4991 | }; |
| 4992 | return __detail::__tuple_transform(__f, _M_current); |
| 4993 | } |
| 4994 | |
| 4995 | friend constexpr bool |
| 4996 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 4997 | requires (equality_comparable<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 4998 | { |
| 4999 | if constexpr (__detail::__all_bidirectional<_Const, _Vs...>) |
| 5000 | return __x._M_current == __y._M_current; |
| 5001 | else |
| 5002 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 5003 | return ((std::get<_Is>(__x._M_current) == std::get<_Is>(__y._M_current)) || ...); |
| 5004 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 5005 | } |
| 5006 | |
| 5007 | friend constexpr auto |
| 5008 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 5009 | requires __detail::__all_random_access<_Const, _Vs...> |
| 5010 | { return __x._M_current <=> __y._M_current; } |
| 5011 | |
| 5012 | friend constexpr _Iterator |
| 5013 | operator+(const _Iterator& __i, difference_type __n) |
| 5014 | requires __detail::__all_random_access<_Const, _Vs...> |
| 5015 | { |
| 5016 | auto __r = __i; |
| 5017 | __r += __n; |
| 5018 | return __r; |
| 5019 | } |
| 5020 | |
| 5021 | friend constexpr _Iterator |
| 5022 | operator+(difference_type __n, const _Iterator& __i) |
| 5023 | requires __detail::__all_random_access<_Const, _Vs...> |
| 5024 | { |
| 5025 | auto __r = __i; |
| 5026 | __r += __n; |
| 5027 | return __r; |
| 5028 | } |
| 5029 | |
| 5030 | friend constexpr _Iterator |
| 5031 | operator-(const _Iterator& __i, difference_type __n) |
| 5032 | requires __detail::__all_random_access<_Const, _Vs...> |
| 5033 | { |
| 5034 | auto __r = __i; |
| 5035 | __r -= __n; |
| 5036 | return __r; |
| 5037 | } |
| 5038 | |
| 5039 | friend constexpr difference_type |
| 5040 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 5041 | requires (sized_sentinel_for<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 5042 | iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 5043 | { |
| 5044 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 5045 | return ranges::min({difference_type(std::get<_Is>(__x._M_current) |
| 5046 | - std::get<_Is>(__y._M_current))...}, |
| 5047 | ranges::less{}, |
| 5048 | [](difference_type __i) { |
| 5049 | return __detail::__to_unsigned_like(__i < 0 ? -__i : __i); |
| 5050 | }); |
| 5051 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 5052 | } |
| 5053 | |
| 5054 | friend constexpr auto |
| 5055 | iter_move(const _Iterator& __i) |
| 5056 | { return __detail::__tuple_transform(ranges::iter_move, __i._M_current); } |
| 5057 | |
| 5058 | friend constexpr void |
| 5059 | iter_swap(const _Iterator& __l, const _Iterator& __r) |
| 5060 | requires (indirectly_swappable<iterator_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 5061 | { |
| 5062 | [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 5063 | (ranges::iter_swap(std::get<_Is>(__l._M_current), std::get<_Is>(__r._M_current)), ...); |
| 5064 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 5065 | } |
| 5066 | |
| 5067 | friend class zip_view; |
| 5068 | }; |
| 5069 | |
| 5070 | template<input_range... _Vs> |
| 5071 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) |
| 5072 | template<bool _Const> |
| 5073 | class zip_view<_Vs...>::_Sentinel |
| 5074 | { |
| 5075 | tuple<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>...> _M_end; |
| 5076 | |
| 5077 | constexpr explicit |
| 5078 | _Sentinel(decltype(_M_end) __end) |
| 5079 | : _M_end(__end) |
| 5080 | { } |
| 5081 | |
| 5082 | friend class zip_view; |
| 5083 | |
| 5084 | public: |
| 5085 | _Sentinel() = default; |
| 5086 | |
| 5087 | constexpr |
| 5088 | _Sentinel(_Sentinel<!_Const> __i) |
| 5089 | requires _Const |
| 5090 | && (convertible_to<sentinel_t<_Vs>, |
| 5091 | sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>> && ...) |
| 5092 | : _M_end(std::move(__i._M_end)) |
| 5093 | { } |
| 5094 | |
| 5095 | template<bool _OtherConst> |
| 5096 | requires (sentinel_for<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 5097 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vs>>> && ...) |
| 5098 | friend constexpr bool |
| 5099 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5100 | { |
| 5101 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 5102 | return ((std::get<_Is>(__x._M_current) == std::get<_Is>(__y._M_end)) || ...); |
| 5103 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 5104 | } |
| 5105 | |
| 5106 | template<bool _OtherConst> |
| 5107 | requires (sized_sentinel_for<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 5108 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vs>>> && ...) |
| 5109 | friend constexpr auto |
| 5110 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5111 | { |
| 5112 | using _Ret |
| 5113 | = common_type_t<range_difference_t<__detail::__maybe_const_t<_OtherConst, _Vs>>...>; |
| 5114 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 5115 | return ranges::min({_Ret(std::get<_Is>(__x._M_current) - std::get<_Is>(__y._M_end))...}, |
| 5116 | ranges::less{}, |
| 5117 | [](_Ret __i) { |
| 5118 | return __detail::__to_unsigned_like(__i < 0 ? -__i : __i); |
| 5119 | }); |
| 5120 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 5121 | } |
| 5122 | |
| 5123 | template<bool _OtherConst> |
| 5124 | requires (sized_sentinel_for<sentinel_t<__detail::__maybe_const_t<_Const, _Vs>>, |
| 5125 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vs>>> && ...) |
| 5126 | friend constexpr auto |
| 5127 | operator-(const _Sentinel& __y, const _Iterator<_OtherConst>& __x) |
| 5128 | { return -(__x - __y); } |
| 5129 | }; |
| 5130 | |
| 5131 | namespace views |
| 5132 | { |
| 5133 | namespace __detail |
| 5134 | { |
| 5135 | template<typename... _Ts> |
| 5136 | concept __can_zip_view |
| 5137 | = requires { zip_view<all_t<_Ts>...>(std::declval<_Ts>()...); }; |
| 5138 | } |
| 5139 | |
| 5140 | struct _Zip |
| 5141 | { |
| 5142 | template<typename... _Ts> |
| 5143 | requires (sizeof...(_Ts) == 0 || __detail::__can_zip_view<_Ts...>) |
| 5144 | constexpr auto |
| 5145 | operator() [[nodiscard]] (_Ts&&... __ts) const |
| 5146 | { |
| 5147 | if constexpr (sizeof...(_Ts) == 0) |
| 5148 | return views::empty<tuple<>>; |
| 5149 | else |
| 5150 | return zip_view<all_t<_Ts>...>(std::forward<_Ts>(__ts)...); |
| 5151 | } |
| 5152 | }; |
| 5153 | |
| 5154 | inline constexpr _Zip zip; |
| 5155 | } |
| 5156 | |
| 5157 | namespace __detail |
| 5158 | { |
| 5159 | template<typename _Range, bool _Const> |
| 5160 | using __range_iter_cat |
| 5161 | = typename iterator_traits<iterator_t<__maybe_const_t<_Const, _Range>>>::iterator_category; |
| 5162 | } |
| 5163 | |
| 5164 | template<move_constructible _Fp, input_range... _Vs> |
| 5165 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && is_object_v<_Fp> |
| 5166 | && regular_invocable<_Fp&, range_reference_t<_Vs>...> |
| 5167 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Vs>...>> |
| 5168 | class zip_transform_view : public view_interface<zip_transform_view<_Fp, _Vs...>> |
| 5169 | { |
| 5170 | [[no_unique_address]] __detail::__box<_Fp> _M_fun; |
| 5171 | zip_view<_Vs...> _M_zip; |
| 5172 | |
| 5173 | using _InnerView = zip_view<_Vs...>; |
| 5174 | |
| 5175 | template<bool _Const> |
| 5176 | using __ziperator = iterator_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5177 | |
| 5178 | template<bool _Const> |
| 5179 | using __zentinel = sentinel_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5180 | |
| 5181 | template<bool _Const> |
| 5182 | using _Base = __detail::__maybe_const_t<_Const, _InnerView>; |
| 5183 | |
| 5184 | template<bool _Const> |
| 5185 | struct __iter_cat |
| 5186 | { }; |
| 5187 | |
| 5188 | template<bool _Const> |
| 5189 | requires forward_range<_Base<_Const>> |
| 5190 | struct __iter_cat<_Const> |
| 5191 | { |
| 5192 | private: |
| 5193 | static auto |
| 5194 | _S_iter_cat() |
| 5195 | { |
| 5196 | using __detail::__maybe_const_t; |
| 5197 | using __detail::__range_iter_cat; |
| 5198 | using _Res = invoke_result_t<__maybe_const_t<_Const, _Fp>&, |
| 5199 | range_reference_t<__maybe_const_t<_Const, _Vs>>...>; |
| 5200 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5201 | // 3798. Rvalue reference and iterator_category |
| 5202 | if constexpr (!is_reference_v<_Res>) |
| 5203 | return input_iterator_tag{}; |
| 5204 | else if constexpr ((derived_from<__range_iter_cat<_Vs, _Const>, |
| 5205 | random_access_iterator_tag> && ...)) |
| 5206 | return random_access_iterator_tag{}; |
| 5207 | else if constexpr ((derived_from<__range_iter_cat<_Vs, _Const>, |
| 5208 | bidirectional_iterator_tag> && ...)) |
| 5209 | return bidirectional_iterator_tag{}; |
| 5210 | else if constexpr ((derived_from<__range_iter_cat<_Vs, _Const>, |
| 5211 | forward_iterator_tag> && ...)) |
| 5212 | return forward_iterator_tag{}; |
| 5213 | else |
| 5214 | return input_iterator_tag{}; |
| 5215 | } |
| 5216 | public: |
| 5217 | using iterator_category = decltype(_S_iter_cat()); |
| 5218 | }; |
| 5219 | |
| 5220 | template<bool> class _Iterator; |
| 5221 | template<bool> class _Sentinel; |
| 5222 | |
| 5223 | public: |
| 5224 | zip_transform_view() = default; |
| 5225 | |
| 5226 | constexpr explicit |
| 5227 | zip_transform_view(_Fp __fun, _Vs... __views) |
| 5228 | : _M_fun(std::move(__fun)), _M_zip(std::move(__views)...) |
| 5229 | { } |
| 5230 | |
| 5231 | constexpr auto |
| 5232 | begin() |
| 5233 | { return _Iterator<false>(*this, _M_zip.begin()); } |
| 5234 | |
| 5235 | constexpr auto |
| 5236 | begin() const |
| 5237 | requires range<const _InnerView> |
| 5238 | && regular_invocable<const _Fp&, range_reference_t<const _Vs>...> |
| 5239 | { return _Iterator<true>(*this, _M_zip.begin()); } |
| 5240 | |
| 5241 | constexpr auto |
| 5242 | end() |
| 5243 | { |
| 5244 | if constexpr (common_range<_InnerView>) |
| 5245 | return _Iterator<false>(*this, _M_zip.end()); |
| 5246 | else |
| 5247 | return _Sentinel<false>(_M_zip.end()); |
| 5248 | } |
| 5249 | |
| 5250 | constexpr auto |
| 5251 | end() const |
| 5252 | requires range<const _InnerView> |
| 5253 | && regular_invocable<const _Fp&, range_reference_t<const _Vs>...> |
| 5254 | { |
| 5255 | if constexpr (common_range<const _InnerView>) |
| 5256 | return _Iterator<true>(*this, _M_zip.end()); |
| 5257 | else |
| 5258 | return _Sentinel<true>(_M_zip.end()); |
| 5259 | } |
| 5260 | |
| 5261 | constexpr auto |
| 5262 | size() requires sized_range<_InnerView> |
| 5263 | { return _M_zip.size(); } |
| 5264 | |
| 5265 | constexpr auto |
| 5266 | size() const requires sized_range<const _InnerView> |
| 5267 | { return _M_zip.size(); } |
| 5268 | }; |
| 5269 | |
| 5270 | template<class _Fp, class... _Rs> |
| 5271 | zip_transform_view(_Fp, _Rs&&...) |
| 5272 | -> zip_transform_view<_Fp, views::all_t<_Rs>...>; |
| 5273 | |
| 5274 | template<move_constructible _Fp, input_range... _Vs> |
| 5275 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && is_object_v<_Fp> |
| 5276 | && regular_invocable<_Fp&, range_reference_t<_Vs>...> |
| 5277 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Vs>...>> |
| 5278 | template<bool _Const> |
| 5279 | class zip_transform_view<_Fp, _Vs...>::_Iterator : public __iter_cat<_Const> |
| 5280 | { |
| 5281 | using _Parent = __detail::__maybe_const_t<_Const, zip_transform_view>; |
| 5282 | using _Fun_handle = __detail::__func_handle_t< |
| 5283 | __detail::__maybe_const_t<_Const, _Fp>, |
| 5284 | iterator_t<__detail::__maybe_const_t<_Const, _Vs>>...>; |
| 5285 | |
| 5286 | [[no_unique_address]] _Fun_handle _M_fun; |
| 5287 | __ziperator<_Const> _M_inner; |
| 5288 | |
| 5289 | constexpr |
| 5290 | _Iterator(_Fun_handle __fun, __ziperator<_Const> __inner) |
| 5291 | : _M_fun(__fun), _M_inner(std::move(__inner)) |
| 5292 | { } |
| 5293 | |
| 5294 | constexpr |
| 5295 | _Iterator(_Parent& __parent, __ziperator<_Const> __inner) |
| 5296 | : _M_fun(*__parent._M_fun), _M_inner(std::move(__inner)) |
| 5297 | { } |
| 5298 | |
| 5299 | friend class zip_transform_view; |
| 5300 | |
| 5301 | public: |
| 5302 | // iterator_category defined in zip_transform_view::__iter_cat |
| 5303 | using iterator_concept = typename __ziperator<_Const>::iterator_concept; |
| 5304 | using value_type |
| 5305 | = remove_cvref_t<invoke_result_t<__detail::__maybe_const_t<_Const, _Fp>&, |
| 5306 | range_reference_t<__detail::__maybe_const_t<_Const, _Vs>>...>>; |
| 5307 | using difference_type = range_difference_t<_Base<_Const>>; |
| 5308 | |
| 5309 | _Iterator() = default; |
| 5310 | |
| 5311 | constexpr |
| 5312 | _Iterator(_Iterator<!_Const> __i) |
| 5313 | requires _Const && convertible_to<__ziperator<false>, __ziperator<_Const>> |
| 5314 | : _M_fun(__i._M_fun), _M_inner(std::move(__i._M_inner)) |
| 5315 | { } |
| 5316 | |
| 5317 | constexpr decltype(auto) |
| 5318 | operator*() const |
| 5319 | { |
| 5320 | return std::apply([&](const auto&... __iters) -> decltype(auto) { |
| 5321 | return _M_fun._M_call_deref(__iters...); |
| 5322 | }, _M_inner._M_current); |
| 5323 | } |
| 5324 | |
| 5325 | constexpr _Iterator& |
| 5326 | operator++() |
| 5327 | { |
| 5328 | ++_M_inner; |
| 5329 | return *this; |
| 5330 | } |
| 5331 | |
| 5332 | constexpr void |
| 5333 | operator++(int) |
| 5334 | { ++*this; } |
| 5335 | |
| 5336 | constexpr _Iterator |
| 5337 | operator++(int) requires forward_range<_Base<_Const>> |
| 5338 | { |
| 5339 | auto __tmp = *this; |
| 5340 | ++*this; |
| 5341 | return __tmp; |
| 5342 | } |
| 5343 | |
| 5344 | constexpr _Iterator& |
| 5345 | operator--() requires bidirectional_range<_Base<_Const>> |
| 5346 | { |
| 5347 | --_M_inner; |
| 5348 | return *this; |
| 5349 | } |
| 5350 | |
| 5351 | constexpr _Iterator |
| 5352 | operator--(int) requires bidirectional_range<_Base<_Const>> |
| 5353 | { |
| 5354 | auto __tmp = *this; |
| 5355 | --*this; |
| 5356 | return __tmp; |
| 5357 | } |
| 5358 | |
| 5359 | constexpr _Iterator& |
| 5360 | operator+=(difference_type __x) requires random_access_range<_Base<_Const>> |
| 5361 | { |
| 5362 | _M_inner += __x; |
| 5363 | return *this; |
| 5364 | } |
| 5365 | |
| 5366 | constexpr _Iterator& |
| 5367 | operator-=(difference_type __x) requires random_access_range<_Base<_Const>> |
| 5368 | { |
| 5369 | _M_inner -= __x; |
| 5370 | return *this; |
| 5371 | } |
| 5372 | |
| 5373 | constexpr decltype(auto) |
| 5374 | operator[](difference_type __n) const requires random_access_range<_Base<_Const>> |
| 5375 | { |
| 5376 | return std::apply([&]<typename... _Is>(const _Is&... __iters) -> decltype(auto) { |
| 5377 | return _M_fun._M_call_subscript(__n, __iters...); |
| 5378 | }, _M_inner._M_current); |
| 5379 | } |
| 5380 | |
| 5381 | friend constexpr bool |
| 5382 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 5383 | requires equality_comparable<__ziperator<_Const>> |
| 5384 | { return __x._M_inner == __y._M_inner; } |
| 5385 | |
| 5386 | friend constexpr auto |
| 5387 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 5388 | requires random_access_range<_Base<_Const>> |
| 5389 | { return __x._M_inner <=> __y._M_inner; } |
| 5390 | |
| 5391 | friend constexpr _Iterator |
| 5392 | operator+(const _Iterator& __i, difference_type __n) |
| 5393 | requires random_access_range<_Base<_Const>> |
| 5394 | { return _Iterator(__i._M_fun, __i._M_inner + __n); } |
| 5395 | |
| 5396 | friend constexpr _Iterator |
| 5397 | operator+(difference_type __n, const _Iterator& __i) |
| 5398 | requires random_access_range<_Base<_Const>> |
| 5399 | { return _Iterator(__i._M_fun, __i._M_inner + __n); } |
| 5400 | |
| 5401 | friend constexpr _Iterator |
| 5402 | operator-(const _Iterator& __i, difference_type __n) |
| 5403 | requires random_access_range<_Base<_Const>> |
| 5404 | { return _Iterator(__i._M_fun, __i._M_inner - __n); } |
| 5405 | |
| 5406 | friend constexpr difference_type |
| 5407 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 5408 | requires sized_sentinel_for<__ziperator<_Const>, __ziperator<_Const>> |
| 5409 | { return __x._M_inner - __y._M_inner; } |
| 5410 | }; |
| 5411 | |
| 5412 | template<move_constructible _Fp, input_range... _Vs> |
| 5413 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && is_object_v<_Fp> |
| 5414 | && regular_invocable<_Fp&, range_reference_t<_Vs>...> |
| 5415 | && std::__detail::__can_reference<invoke_result_t<_Fp&, range_reference_t<_Vs>...>> |
| 5416 | template<bool _Const> |
| 5417 | class zip_transform_view<_Fp, _Vs...>::_Sentinel |
| 5418 | { |
| 5419 | __zentinel<_Const> _M_inner; |
| 5420 | |
| 5421 | constexpr explicit |
| 5422 | _Sentinel(__zentinel<_Const> __inner) |
| 5423 | : _M_inner(__inner) |
| 5424 | { } |
| 5425 | |
| 5426 | friend class zip_transform_view; |
| 5427 | |
| 5428 | public: |
| 5429 | _Sentinel() = default; |
| 5430 | |
| 5431 | constexpr |
| 5432 | _Sentinel(_Sentinel<!_Const> __i) |
| 5433 | requires _Const && convertible_to<__zentinel<false>, __zentinel<_Const>> |
| 5434 | : _M_inner(std::move(__i._M_inner)) |
| 5435 | { } |
| 5436 | |
| 5437 | template<bool _OtherConst> |
| 5438 | requires sentinel_for<__zentinel<_Const>, __ziperator<_OtherConst>> |
| 5439 | friend constexpr bool |
| 5440 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5441 | { return __x._M_inner == __y._M_inner; } |
| 5442 | |
| 5443 | template<bool _OtherConst> |
| 5444 | requires sized_sentinel_for<__zentinel<_Const>, __ziperator<_OtherConst>> |
| 5445 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 5446 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5447 | { return __x._M_inner - __y._M_inner; } |
| 5448 | |
| 5449 | template<bool _OtherConst> |
| 5450 | requires sized_sentinel_for<__zentinel<_Const>, __ziperator<_OtherConst>> |
| 5451 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 5452 | operator-(const _Sentinel& __x, const _Iterator<_OtherConst>& __y) |
| 5453 | { return __x._M_inner - __y._M_inner; } |
| 5454 | }; |
| 5455 | |
| 5456 | namespace views |
| 5457 | { |
| 5458 | namespace __detail |
| 5459 | { |
| 5460 | template<typename _Fp, typename... _Ts> |
| 5461 | concept __can_zip_transform_view |
| 5462 | = requires { zip_transform_view(std::declval<_Fp>(), std::declval<_Ts>()...); }; |
| 5463 | } |
| 5464 | |
| 5465 | struct _ZipTransform |
| 5466 | { |
| 5467 | template<typename _Fp> |
| 5468 | requires move_constructible<decay_t<_Fp>> && regular_invocable<decay_t<_Fp>&> |
| 5469 | && is_object_v<decay_t<invoke_result_t<decay_t<_Fp>&>>> |
| 5470 | constexpr auto |
| 5471 | operator() [[nodiscard]] (_Fp&&) const |
| 5472 | { |
| 5473 | return views::empty<decay_t<invoke_result_t<decay_t<_Fp>&>>>; |
| 5474 | } |
| 5475 | |
| 5476 | template<typename _Fp, typename... _Ts> |
| 5477 | requires (sizeof...(_Ts) != 0) && __detail::__can_zip_transform_view<_Fp, _Ts...> |
| 5478 | constexpr auto |
| 5479 | operator() [[nodiscard]] (_Fp&& __f, _Ts&&... __ts) const |
| 5480 | { |
| 5481 | return zip_transform_view(std::forward<_Fp>(__f), std::forward<_Ts>(__ts)...); |
| 5482 | } |
| 5483 | }; |
| 5484 | |
| 5485 | inline constexpr _ZipTransform zip_transform; |
| 5486 | } |
| 5487 | |
| 5488 | template<forward_range _Vp, size_t _Nm> |
| 5489 | requires view<_Vp> && (_Nm > 0) |
| 5490 | class adjacent_view : public view_interface<adjacent_view<_Vp, _Nm>> |
| 5491 | { |
| 5492 | _Vp _M_base = _Vp(); |
| 5493 | |
| 5494 | template<bool> class _Iterator; |
| 5495 | template<bool> class _Sentinel; |
| 5496 | |
| 5497 | struct __as_sentinel |
| 5498 | { }; |
| 5499 | |
| 5500 | public: |
| 5501 | adjacent_view() requires default_initializable<_Vp> = default; |
| 5502 | |
| 5503 | constexpr explicit |
| 5504 | adjacent_view(_Vp __base) |
| 5505 | : _M_base(std::move(__base)) |
| 5506 | { } |
| 5507 | |
| 5508 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5509 | // 3848. adjacent_view, adjacent_transform_view and slide_view missing base accessor |
| 5510 | constexpr _Vp |
| 5511 | base() const & requires copy_constructible<_Vp> |
| 5512 | { return _M_base; } |
| 5513 | |
| 5514 | constexpr _Vp |
| 5515 | base() && |
| 5516 | { return std::move(_M_base); } |
| 5517 | |
| 5518 | constexpr auto |
| 5519 | begin() requires (!__detail::__simple_view<_Vp>) |
| 5520 | { return _Iterator<false>(ranges::begin(_M_base), ranges::end(_M_base)); } |
| 5521 | |
| 5522 | constexpr auto |
| 5523 | begin() const requires range<const _Vp> |
| 5524 | { return _Iterator<true>(ranges::begin(_M_base), ranges::end(_M_base)); } |
| 5525 | |
| 5526 | constexpr auto |
| 5527 | end() requires (!__detail::__simple_view<_Vp>) |
| 5528 | { |
| 5529 | if constexpr (common_range<_Vp>) |
| 5530 | return _Iterator<false>(__as_sentinel{}, ranges::begin(_M_base), ranges::end(_M_base)); |
| 5531 | else |
| 5532 | return _Sentinel<false>(ranges::end(_M_base)); |
| 5533 | } |
| 5534 | |
| 5535 | constexpr auto |
| 5536 | end() const requires range<const _Vp> |
| 5537 | { |
| 5538 | if constexpr (common_range<const _Vp>) |
| 5539 | return _Iterator<true>(__as_sentinel{}, ranges::begin(_M_base), ranges::end(_M_base)); |
| 5540 | else |
| 5541 | return _Sentinel<true>(ranges::end(_M_base)); |
| 5542 | } |
| 5543 | |
| 5544 | constexpr auto |
| 5545 | size() requires sized_range<_Vp> |
| 5546 | { |
| 5547 | using _ST = decltype(ranges::size(_M_base)); |
| 5548 | using _CT = common_type_t<_ST, size_t>; |
| 5549 | auto __sz = static_cast<_CT>(ranges::size(_M_base)); |
| 5550 | __sz -= std::min<_CT>(__sz, _Nm - 1); |
| 5551 | return static_cast<_ST>(__sz); |
| 5552 | } |
| 5553 | |
| 5554 | constexpr auto |
| 5555 | size() const requires sized_range<const _Vp> |
| 5556 | { |
| 5557 | using _ST = decltype(ranges::size(_M_base)); |
| 5558 | using _CT = common_type_t<_ST, size_t>; |
| 5559 | auto __sz = static_cast<_CT>(ranges::size(_M_base)); |
| 5560 | __sz -= std::min<_CT>(__sz, _Nm - 1); |
| 5561 | return static_cast<_ST>(__sz); |
| 5562 | } |
| 5563 | }; |
| 5564 | |
| 5565 | template<typename _Vp, size_t _Nm> |
| 5566 | inline constexpr bool enable_borrowed_range<adjacent_view<_Vp, _Nm>> |
| 5567 | = enable_borrowed_range<_Vp>; |
| 5568 | |
| 5569 | namespace __detail |
| 5570 | { |
| 5571 | // Yields tuple<_Tp, ..., _Tp> with _Nm elements. |
| 5572 | template<typename _Tp, size_t _Nm> |
| 5573 | using __repeated_tuple = typename __make_tuple<array<_Tp, _Nm>>::__type; |
| 5574 | |
| 5575 | // For a functor F that is callable with N arguments, the expression |
| 5576 | // declval<__unarize<F, N>>(x) is equivalent to declval<F>(x, ..., x). |
| 5577 | template<typename _Fp, size_t _Nm> |
| 5578 | struct __unarize |
| 5579 | { |
| 5580 | template<typename... _Ts> |
| 5581 | static invoke_result_t<_Fp, _Ts...> |
| 5582 | __tuple_apply(const tuple<_Ts...>&); // not defined |
| 5583 | |
| 5584 | template<typename _Tp> |
| 5585 | decltype(__tuple_apply(std::declval<__repeated_tuple<_Tp, _Nm>>())) |
| 5586 | operator()(_Tp&&); // not defined |
| 5587 | }; |
| 5588 | } |
| 5589 | |
| 5590 | template<forward_range _Vp, size_t _Nm> |
| 5591 | requires view<_Vp> && (_Nm > 0) |
| 5592 | template<bool _Const> |
| 5593 | class adjacent_view<_Vp, _Nm>::_Iterator |
| 5594 | { |
| 5595 | #ifdef _GLIBCXX_CLANG // LLVM-61763 workaround |
| 5596 | public: |
| 5597 | #endif |
| 5598 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 5599 | array<iterator_t<_Base>, _Nm> _M_current = array<iterator_t<_Base>, _Nm>(); |
| 5600 | |
| 5601 | constexpr |
| 5602 | _Iterator(iterator_t<_Base> __first, sentinel_t<_Base> __last) |
| 5603 | { |
| 5604 | for (auto& __i : _M_current) |
| 5605 | { |
| 5606 | __i = __first; |
| 5607 | ranges::advance(__first, 1, __last); |
| 5608 | } |
| 5609 | } |
| 5610 | |
| 5611 | constexpr |
| 5612 | _Iterator(__as_sentinel, iterator_t<_Base> __first, iterator_t<_Base> __last) |
| 5613 | { |
| 5614 | if constexpr (!bidirectional_range<_Base>) |
| 5615 | for (auto& __it : _M_current) |
| 5616 | __it = __last; |
| 5617 | else |
| 5618 | for (size_t __i = 0; __i < _Nm; ++__i) |
| 5619 | { |
| 5620 | _M_current[_Nm - 1 - __i] = __last; |
| 5621 | ranges::advance(__last, -1, __first); |
| 5622 | } |
| 5623 | } |
| 5624 | |
| 5625 | static auto |
| 5626 | _S_iter_concept() |
| 5627 | { |
| 5628 | if constexpr (random_access_range<_Base>) |
| 5629 | return random_access_iterator_tag{}; |
| 5630 | else if constexpr (bidirectional_range<_Base>) |
| 5631 | return bidirectional_iterator_tag{}; |
| 5632 | else |
| 5633 | return forward_iterator_tag{}; |
| 5634 | } |
| 5635 | |
| 5636 | friend class adjacent_view; |
| 5637 | |
| 5638 | #ifndef _GLIBCXX_CLANG // LLVM-61763 workaround |
| 5639 | template<forward_range _Wp, move_constructible _Fp, size_t _Mm> |
| 5640 | requires view<_Wp> && (_Mm > 0) && is_object_v<_Fp> |
| 5641 | && regular_invocable<__detail::__unarize<_Fp&, _Mm>, range_reference_t<_Wp>> |
| 5642 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Mm>, |
| 5643 | range_reference_t<_Wp>>> |
| 5644 | friend class adjacent_transform_view; |
| 5645 | #endif |
| 5646 | |
| 5647 | public: |
| 5648 | using iterator_category = input_iterator_tag; |
| 5649 | using iterator_concept = decltype(_S_iter_concept()); |
| 5650 | using value_type = __detail::__repeated_tuple<range_value_t<_Base>, _Nm>; |
| 5651 | using difference_type = range_difference_t<_Base>; |
| 5652 | |
| 5653 | _Iterator() = default; |
| 5654 | |
| 5655 | constexpr |
| 5656 | _Iterator(_Iterator<!_Const> __i) |
| 5657 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 5658 | { |
| 5659 | for (size_t __j = 0; __j < _Nm; ++__j) |
| 5660 | _M_current[__j] = std::move(__i._M_current[__j]); |
| 5661 | } |
| 5662 | |
| 5663 | constexpr auto |
| 5664 | operator*() const |
| 5665 | { |
| 5666 | auto __f = [](auto& __i) -> decltype(auto) { return *__i; }; |
| 5667 | return __detail::__tuple_transform(__f, _M_current); |
| 5668 | } |
| 5669 | |
| 5670 | constexpr _Iterator& |
| 5671 | operator++() |
| 5672 | { |
| 5673 | for (auto& __i : _M_current) |
| 5674 | ++__i; |
| 5675 | return *this; |
| 5676 | } |
| 5677 | |
| 5678 | constexpr _Iterator |
| 5679 | operator++(int) |
| 5680 | { |
| 5681 | auto __tmp = *this; |
| 5682 | ++*this; |
| 5683 | return __tmp; |
| 5684 | } |
| 5685 | |
| 5686 | constexpr _Iterator& |
| 5687 | operator--() requires bidirectional_range<_Base> |
| 5688 | { |
| 5689 | for (auto& __i : _M_current) |
| 5690 | --__i; |
| 5691 | return *this; |
| 5692 | } |
| 5693 | |
| 5694 | constexpr _Iterator |
| 5695 | operator--(int) requires bidirectional_range<_Base> |
| 5696 | { |
| 5697 | auto __tmp = *this; |
| 5698 | --*this; |
| 5699 | return __tmp; |
| 5700 | } |
| 5701 | |
| 5702 | constexpr _Iterator& |
| 5703 | operator+=(difference_type __x) |
| 5704 | requires random_access_range<_Base> |
| 5705 | { |
| 5706 | for (auto& __i : _M_current) |
| 5707 | __i += __x; |
| 5708 | return *this; |
| 5709 | } |
| 5710 | |
| 5711 | constexpr _Iterator& |
| 5712 | operator-=(difference_type __x) |
| 5713 | requires random_access_range<_Base> |
| 5714 | { |
| 5715 | for (auto& __i : _M_current) |
| 5716 | __i -= __x; |
| 5717 | return *this; |
| 5718 | } |
| 5719 | |
| 5720 | constexpr auto |
| 5721 | operator[](difference_type __n) const |
| 5722 | requires random_access_range<_Base> |
| 5723 | { |
| 5724 | auto __f = [&](auto& __i) -> decltype(auto) { return __i[__n]; }; |
| 5725 | return __detail::__tuple_transform(__f, _M_current); |
| 5726 | } |
| 5727 | |
| 5728 | friend constexpr bool |
| 5729 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 5730 | { return __x._M_current.back() == __y._M_current.back(); } |
| 5731 | |
| 5732 | friend constexpr bool |
| 5733 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 5734 | requires random_access_range<_Base> |
| 5735 | { return __x._M_current.back() < __y._M_current.back(); } |
| 5736 | |
| 5737 | friend constexpr bool |
| 5738 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 5739 | requires random_access_range<_Base> |
| 5740 | { return __y < __x; } |
| 5741 | |
| 5742 | friend constexpr bool |
| 5743 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 5744 | requires random_access_range<_Base> |
| 5745 | { return !(__y < __x); } |
| 5746 | |
| 5747 | friend constexpr bool |
| 5748 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 5749 | requires random_access_range<_Base> |
| 5750 | { return !(__x < __y); } |
| 5751 | |
| 5752 | friend constexpr auto |
| 5753 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 5754 | requires random_access_range<_Base> |
| 5755 | && three_way_comparable<iterator_t<_Base>> |
| 5756 | { return __x._M_current.back() <=> __y._M_current.back(); } |
| 5757 | |
| 5758 | friend constexpr _Iterator |
| 5759 | operator+(const _Iterator& __i, difference_type __n) |
| 5760 | requires random_access_range<_Base> |
| 5761 | { |
| 5762 | auto __r = __i; |
| 5763 | __r += __n; |
| 5764 | return __r; |
| 5765 | } |
| 5766 | |
| 5767 | friend constexpr _Iterator |
| 5768 | operator+(difference_type __n, const _Iterator& __i) |
| 5769 | requires random_access_range<_Base> |
| 5770 | { |
| 5771 | auto __r = __i; |
| 5772 | __r += __n; |
| 5773 | return __r; |
| 5774 | } |
| 5775 | |
| 5776 | friend constexpr _Iterator |
| 5777 | operator-(const _Iterator& __i, difference_type __n) |
| 5778 | requires random_access_range<_Base> |
| 5779 | { |
| 5780 | auto __r = __i; |
| 5781 | __r -= __n; |
| 5782 | return __r; |
| 5783 | } |
| 5784 | |
| 5785 | friend constexpr difference_type |
| 5786 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 5787 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 5788 | { return __x._M_current.back() - __y._M_current.back(); } |
| 5789 | |
| 5790 | friend constexpr auto |
| 5791 | iter_move(const _Iterator& __i) |
| 5792 | { return __detail::__tuple_transform(ranges::iter_move, __i._M_current); } |
| 5793 | |
| 5794 | friend constexpr void |
| 5795 | iter_swap(const _Iterator& __l, const _Iterator& __r) |
| 5796 | requires indirectly_swappable<iterator_t<_Base>> |
| 5797 | { |
| 5798 | for (size_t __i = 0; __i < _Nm; __i++) |
| 5799 | ranges::iter_swap(__l._M_current[__i], __r._M_current[__i]); |
| 5800 | } |
| 5801 | }; |
| 5802 | |
| 5803 | template<forward_range _Vp, size_t _Nm> |
| 5804 | requires view<_Vp> && (_Nm > 0) |
| 5805 | template<bool _Const> |
| 5806 | class adjacent_view<_Vp, _Nm>::_Sentinel |
| 5807 | { |
| 5808 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 5809 | |
| 5810 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 5811 | |
| 5812 | constexpr explicit |
| 5813 | _Sentinel(sentinel_t<_Base> __end) |
| 5814 | : _M_end(__end) |
| 5815 | { } |
| 5816 | |
| 5817 | friend class adjacent_view; |
| 5818 | |
| 5819 | public: |
| 5820 | _Sentinel() = default; |
| 5821 | |
| 5822 | constexpr |
| 5823 | _Sentinel(_Sentinel<!_Const> __i) |
| 5824 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 5825 | : _M_end(std::move(__i._M_end)) |
| 5826 | { } |
| 5827 | |
| 5828 | template<bool _OtherConst> |
| 5829 | requires sentinel_for<sentinel_t<_Base>, |
| 5830 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 5831 | friend constexpr bool |
| 5832 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5833 | { return __x._M_current.back() == __y._M_end; } |
| 5834 | |
| 5835 | template<bool _OtherConst> |
| 5836 | requires sized_sentinel_for<sentinel_t<_Base>, |
| 5837 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 5838 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _Vp>> |
| 5839 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 5840 | { return __x._M_current.back() - __y._M_end; } |
| 5841 | |
| 5842 | template<bool _OtherConst> |
| 5843 | requires sized_sentinel_for<sentinel_t<_Base>, |
| 5844 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 5845 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _Vp>> |
| 5846 | operator-(const _Sentinel& __y, const _Iterator<_OtherConst>& __x) |
| 5847 | { return __y._M_end - __x._M_current.back(); } |
| 5848 | }; |
| 5849 | |
| 5850 | namespace views |
| 5851 | { |
| 5852 | namespace __detail |
| 5853 | { |
| 5854 | template<size_t _Nm, typename _Range> |
| 5855 | concept __can_adjacent_view |
| 5856 | = requires { adjacent_view<all_t<_Range>, _Nm>(std::declval<_Range>()); }; |
| 5857 | } |
| 5858 | |
| 5859 | template<size_t _Nm> |
| 5860 | struct _Adjacent : __adaptor::_RangeAdaptorClosure<_Adjacent<_Nm>> |
| 5861 | { |
| 5862 | template<viewable_range _Range> |
| 5863 | requires (_Nm == 0) || __detail::__can_adjacent_view<_Nm, _Range> |
| 5864 | constexpr auto |
| 5865 | operator() [[nodiscard]] (_Range&& __r) const |
| 5866 | { |
| 5867 | if constexpr (_Nm == 0) |
| 5868 | return views::empty<tuple<>>; |
| 5869 | else |
| 5870 | return adjacent_view<all_t<_Range>, _Nm>(std::forward<_Range>(__r)); |
| 5871 | } |
| 5872 | }; |
| 5873 | |
| 5874 | template<size_t _Nm> |
| 5875 | inline constexpr _Adjacent<_Nm> adjacent; |
| 5876 | |
| 5877 | inline constexpr auto pairwise = adjacent<2>; |
| 5878 | } |
| 5879 | |
| 5880 | template<forward_range _Vp, move_constructible _Fp, size_t _Nm> |
| 5881 | requires view<_Vp> && (_Nm > 0) && is_object_v<_Fp> |
| 5882 | && regular_invocable<__detail::__unarize<_Fp&, _Nm>, range_reference_t<_Vp>> |
| 5883 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Nm>, |
| 5884 | range_reference_t<_Vp>>> |
| 5885 | class adjacent_transform_view : public view_interface<adjacent_transform_view<_Vp, _Fp, _Nm>> |
| 5886 | { |
| 5887 | [[no_unique_address]] __detail::__box<_Fp> _M_fun; |
| 5888 | adjacent_view<_Vp, _Nm> _M_inner; |
| 5889 | |
| 5890 | using _InnerView = adjacent_view<_Vp, _Nm>; |
| 5891 | |
| 5892 | template<bool _Const> |
| 5893 | using _InnerIter = iterator_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5894 | |
| 5895 | template<bool _Const> |
| 5896 | using _InnerSent = sentinel_t<__detail::__maybe_const_t<_Const, _InnerView>>; |
| 5897 | |
| 5898 | template<bool> class _Iterator; |
| 5899 | template<bool> class _Sentinel; |
| 5900 | |
| 5901 | public: |
| 5902 | adjacent_transform_view() = default; |
| 5903 | |
| 5904 | constexpr explicit |
| 5905 | adjacent_transform_view(_Vp __base, _Fp __fun) |
| 5906 | : _M_fun(std::move(__fun)), _M_inner(std::move(__base)) |
| 5907 | { } |
| 5908 | |
| 5909 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5910 | // 3848. adjacent_view, adjacent_transform_view and slide_view missing base accessor |
| 5911 | // 3947. Unexpected constraints on adjacent_transform_view::base() |
| 5912 | constexpr _Vp |
| 5913 | base() const & requires copy_constructible<_Vp> |
| 5914 | { return _M_inner.base(); } |
| 5915 | |
| 5916 | constexpr _Vp |
| 5917 | base() && |
| 5918 | { return std::move(_M_inner.base()); } |
| 5919 | |
| 5920 | constexpr auto |
| 5921 | begin() |
| 5922 | { return _Iterator<false>(*this, _M_inner.begin()); } |
| 5923 | |
| 5924 | constexpr auto |
| 5925 | begin() const |
| 5926 | requires range<const _InnerView> |
| 5927 | && regular_invocable<__detail::__unarize<const _Fp&, _Nm>, |
| 5928 | range_reference_t<const _Vp>> |
| 5929 | { return _Iterator<true>(*this, _M_inner.begin()); } |
| 5930 | |
| 5931 | constexpr auto |
| 5932 | end() |
| 5933 | { |
| 5934 | if constexpr (common_range<_InnerView>) |
| 5935 | return _Iterator<false>(*this, _M_inner.end()); |
| 5936 | else |
| 5937 | return _Sentinel<false>(_M_inner.end()); |
| 5938 | } |
| 5939 | |
| 5940 | constexpr auto |
| 5941 | end() const |
| 5942 | requires range<const _InnerView> |
| 5943 | && regular_invocable<__detail::__unarize<const _Fp&, _Nm>, |
| 5944 | range_reference_t<const _Vp>> |
| 5945 | { |
| 5946 | if constexpr (common_range<const _InnerView>) |
| 5947 | return _Iterator<true>(*this, _M_inner.end()); |
| 5948 | else |
| 5949 | return _Sentinel<true>(_M_inner.end()); |
| 5950 | } |
| 5951 | |
| 5952 | constexpr auto |
| 5953 | size() requires sized_range<_InnerView> |
| 5954 | { return _M_inner.size(); } |
| 5955 | |
| 5956 | constexpr auto |
| 5957 | size() const requires sized_range<const _InnerView> |
| 5958 | { return _M_inner.size(); } |
| 5959 | }; |
| 5960 | |
| 5961 | template<forward_range _Vp, move_constructible _Fp, size_t _Nm> |
| 5962 | requires view<_Vp> && (_Nm > 0) && is_object_v<_Fp> |
| 5963 | && regular_invocable<__detail::__unarize<_Fp&, _Nm>, range_reference_t<_Vp>> |
| 5964 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Nm>, |
| 5965 | range_reference_t<_Vp>>> |
| 5966 | template<bool _Const> |
| 5967 | class adjacent_transform_view<_Vp, _Fp, _Nm>::_Iterator |
| 5968 | { |
| 5969 | using _Parent = __detail::__maybe_const_t<_Const, adjacent_transform_view>; |
| 5970 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 5971 | using _Fun_handle = decltype([]<size_t... _Ids>(std::index_sequence<_Ids...>) { |
| 5972 | return __detail::__func_handle_t< |
| 5973 | __detail::__maybe_const_t<_Const, _Fp>, |
| 5974 | iterator_t<__detail::__maybe_const_t<(_Ids, _Const), _Vp>>...>(); |
| 5975 | }(make_index_sequence<_Nm>())); |
| 5976 | |
| 5977 | [[no_unique_address]] _Fun_handle _M_fun; |
| 5978 | _InnerIter<_Const> _M_inner; |
| 5979 | |
| 5980 | constexpr |
| 5981 | _Iterator(_Fun_handle __fun, _InnerIter<_Const> __inner) |
| 5982 | : _M_fun(__fun), _M_inner(std::move(__inner)) |
| 5983 | { } |
| 5984 | |
| 5985 | constexpr |
| 5986 | _Iterator(_Parent& __parent, _InnerIter<_Const> __inner) |
| 5987 | : _M_fun(*__parent._M_fun), _M_inner(std::move(__inner)) |
| 5988 | { } |
| 5989 | |
| 5990 | static auto |
| 5991 | _S_iter_cat() |
| 5992 | { |
| 5993 | using __detail::__maybe_const_t; |
| 5994 | using __detail::__unarize; |
| 5995 | using _Res = invoke_result_t<__unarize<__maybe_const_t<_Const, _Fp>&, _Nm>, |
| 5996 | range_reference_t<_Base>>; |
| 5997 | using _Cat = typename iterator_traits<iterator_t<_Base>>::iterator_category; |
| 5998 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 5999 | // 3798. Rvalue reference and iterator_category |
| 6000 | if constexpr (!is_reference_v<_Res>) |
| 6001 | return input_iterator_tag{}; |
| 6002 | else if constexpr (derived_from<_Cat, random_access_iterator_tag>) |
| 6003 | return random_access_iterator_tag{}; |
| 6004 | else if constexpr (derived_from<_Cat, bidirectional_iterator_tag>) |
| 6005 | return bidirectional_iterator_tag{}; |
| 6006 | else if constexpr (derived_from<_Cat, forward_iterator_tag>) |
| 6007 | return forward_iterator_tag{}; |
| 6008 | else |
| 6009 | return input_iterator_tag{}; |
| 6010 | } |
| 6011 | |
| 6012 | friend class adjacent_transform_view; |
| 6013 | |
| 6014 | public: |
| 6015 | using iterator_category = decltype(_S_iter_cat()); |
| 6016 | using iterator_concept = typename _InnerIter<_Const>::iterator_concept; |
| 6017 | using value_type |
| 6018 | = remove_cvref_t<invoke_result_t |
| 6019 | <__detail::__unarize<__detail::__maybe_const_t<_Const, _Fp>&, _Nm>, |
| 6020 | range_reference_t<_Base>>>; |
| 6021 | using difference_type = range_difference_t<_Base>; |
| 6022 | |
| 6023 | _Iterator() = default; |
| 6024 | |
| 6025 | constexpr |
| 6026 | _Iterator(_Iterator<!_Const> __i) |
| 6027 | requires _Const && convertible_to<_InnerIter<false>, _InnerIter<_Const>> |
| 6028 | : _M_fun(__i._M_fun), _M_inner(std::move(__i._M_inner)) |
| 6029 | { } |
| 6030 | |
| 6031 | constexpr decltype(auto) |
| 6032 | operator*() const |
| 6033 | { |
| 6034 | return std::apply([&](const auto&... __iters) -> decltype(auto) { |
| 6035 | return _M_fun._M_call_deref(__iters...); |
| 6036 | }, _M_inner._M_current); |
| 6037 | } |
| 6038 | |
| 6039 | constexpr _Iterator& |
| 6040 | operator++() |
| 6041 | { |
| 6042 | ++_M_inner; |
| 6043 | return *this; |
| 6044 | } |
| 6045 | |
| 6046 | constexpr _Iterator |
| 6047 | operator++(int) |
| 6048 | { |
| 6049 | auto __tmp = *this; |
| 6050 | ++*this; |
| 6051 | return __tmp; |
| 6052 | } |
| 6053 | |
| 6054 | constexpr _Iterator& |
| 6055 | operator--() requires bidirectional_range<_Base> |
| 6056 | { |
| 6057 | --_M_inner; |
| 6058 | return *this; |
| 6059 | } |
| 6060 | |
| 6061 | constexpr _Iterator |
| 6062 | operator--(int) requires bidirectional_range<_Base> |
| 6063 | { |
| 6064 | auto __tmp = *this; |
| 6065 | --*this; |
| 6066 | return __tmp; |
| 6067 | } |
| 6068 | |
| 6069 | constexpr _Iterator& |
| 6070 | operator+=(difference_type __x) requires random_access_range<_Base> |
| 6071 | { |
| 6072 | _M_inner += __x; |
| 6073 | return *this; |
| 6074 | } |
| 6075 | |
| 6076 | constexpr _Iterator& |
| 6077 | operator-=(difference_type __x) requires random_access_range<_Base> |
| 6078 | { |
| 6079 | _M_inner -= __x; |
| 6080 | return *this; |
| 6081 | } |
| 6082 | |
| 6083 | constexpr decltype(auto) |
| 6084 | operator[](difference_type __n) const requires random_access_range<_Base> |
| 6085 | { |
| 6086 | return std::apply([&](const auto&... __iters) -> decltype(auto) { |
| 6087 | return _M_fun._M_call_subscript(__n, __iters...); |
| 6088 | }, _M_inner._M_current); |
| 6089 | } |
| 6090 | |
| 6091 | friend constexpr bool |
| 6092 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 6093 | { return __x._M_inner == __y._M_inner; } |
| 6094 | |
| 6095 | friend constexpr bool |
| 6096 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 6097 | requires random_access_range<_Base> |
| 6098 | { return __x._M_inner < __y._M_inner; } |
| 6099 | |
| 6100 | friend constexpr bool |
| 6101 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 6102 | requires random_access_range<_Base> |
| 6103 | { return __x._M_inner > __y._M_inner; } |
| 6104 | |
| 6105 | friend constexpr bool |
| 6106 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 6107 | requires random_access_range<_Base> |
| 6108 | { return __x._M_inner <= __y._M_inner; } |
| 6109 | |
| 6110 | friend constexpr bool |
| 6111 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 6112 | requires random_access_range<_Base> |
| 6113 | { return __x._M_inner >= __y._M_inner; } |
| 6114 | |
| 6115 | friend constexpr auto |
| 6116 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 6117 | requires random_access_range<_Base> && |
| 6118 | three_way_comparable<_InnerIter<_Const>> |
| 6119 | { return __x._M_inner <=> __y._M_inner; } |
| 6120 | |
| 6121 | friend constexpr _Iterator |
| 6122 | operator+(const _Iterator& __i, difference_type __n) |
| 6123 | requires random_access_range<_Base> |
| 6124 | { return _Iterator(__i._M_fun, __i._M_inner + __n); } |
| 6125 | |
| 6126 | friend constexpr _Iterator |
| 6127 | operator+(difference_type __n, const _Iterator& __i) |
| 6128 | requires random_access_range<_Base> |
| 6129 | { return _Iterator(__i._M_fun, __i._M_inner + __n); } |
| 6130 | |
| 6131 | friend constexpr _Iterator |
| 6132 | operator-(const _Iterator& __i, difference_type __n) |
| 6133 | requires random_access_range<_Base> |
| 6134 | { return _Iterator(__i._M_fun, __i._M_inner - __n); } |
| 6135 | |
| 6136 | friend constexpr difference_type |
| 6137 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 6138 | requires sized_sentinel_for<_InnerIter<_Const>, _InnerIter<_Const>> |
| 6139 | { return __x._M_inner - __y._M_inner; } |
| 6140 | }; |
| 6141 | |
| 6142 | template<forward_range _Vp, move_constructible _Fp, size_t _Nm> |
| 6143 | requires view<_Vp> && (_Nm > 0) && is_object_v<_Fp> |
| 6144 | && regular_invocable<__detail::__unarize<_Fp&, _Nm>, range_reference_t<_Vp>> |
| 6145 | && std::__detail::__can_reference<invoke_result_t<__detail::__unarize<_Fp&, _Nm>, |
| 6146 | range_reference_t<_Vp>>> |
| 6147 | template<bool _Const> |
| 6148 | class adjacent_transform_view<_Vp, _Fp, _Nm>::_Sentinel |
| 6149 | { |
| 6150 | _InnerSent<_Const> _M_inner; |
| 6151 | |
| 6152 | constexpr explicit |
| 6153 | _Sentinel(_InnerSent<_Const> __inner) |
| 6154 | : _M_inner(__inner) |
| 6155 | { } |
| 6156 | |
| 6157 | friend class adjacent_transform_view; |
| 6158 | |
| 6159 | public: |
| 6160 | _Sentinel() = default; |
| 6161 | |
| 6162 | constexpr |
| 6163 | _Sentinel(_Sentinel<!_Const> __i) |
| 6164 | requires _Const && convertible_to<_InnerSent<false>, _InnerSent<_Const>> |
| 6165 | : _M_inner(std::move(__i._M_inner)) |
| 6166 | { } |
| 6167 | |
| 6168 | template<bool _OtherConst> |
| 6169 | requires sentinel_for<_InnerSent<_Const>, _InnerIter<_OtherConst>> |
| 6170 | friend constexpr bool |
| 6171 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 6172 | { return __x._M_inner == __y._M_inner; } |
| 6173 | |
| 6174 | template<bool _OtherConst> |
| 6175 | requires sized_sentinel_for<_InnerSent<_Const>, _InnerIter<_OtherConst>> |
| 6176 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 6177 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 6178 | { return __x._M_inner - __y._M_inner; } |
| 6179 | |
| 6180 | template<bool _OtherConst> |
| 6181 | requires sized_sentinel_for<_InnerSent<_Const>, _InnerIter<_OtherConst>> |
| 6182 | friend constexpr range_difference_t<__detail::__maybe_const_t<_OtherConst, _InnerView>> |
| 6183 | operator-(const _Sentinel& __x, const _Iterator<_OtherConst>& __y) |
| 6184 | { return __x._M_inner - __y._M_inner; } |
| 6185 | }; |
| 6186 | |
| 6187 | namespace views |
| 6188 | { |
| 6189 | namespace __detail |
| 6190 | { |
| 6191 | template<size_t _Nm, typename _Range, typename _Fp> |
| 6192 | concept __can_adjacent_transform_view |
| 6193 | = requires { adjacent_transform_view<all_t<_Range>, decay_t<_Fp>, _Nm> |
| 6194 | (std::declval<_Range>(), std::declval<_Fp>()); }; |
| 6195 | } |
| 6196 | |
| 6197 | template<size_t _Nm> |
| 6198 | struct _AdjacentTransform : __adaptor::_RangeAdaptor<_AdjacentTransform<_Nm>> |
| 6199 | { |
| 6200 | template<viewable_range _Range, typename _Fp> |
| 6201 | requires (_Nm == 0) || __detail::__can_adjacent_transform_view<_Nm, _Range, _Fp> |
| 6202 | constexpr auto |
| 6203 | operator() [[nodiscard]] (_Range&& __r, _Fp&& __f) const |
| 6204 | { |
| 6205 | if constexpr (_Nm == 0) |
| 6206 | return zip_transform(std::forward<_Fp>(__f)); |
| 6207 | else |
| 6208 | return adjacent_transform_view<all_t<_Range>, decay_t<_Fp>, _Nm> |
| 6209 | (std::forward<_Range>(__r), std::forward<_Fp>(__f)); |
| 6210 | } |
| 6211 | |
| 6212 | using __adaptor::_RangeAdaptor<_AdjacentTransform>::operator(); |
| 6213 | static constexpr int _S_arity = 2; |
| 6214 | static constexpr bool _S_has_simple_extra_args = true; |
| 6215 | }; |
| 6216 | |
| 6217 | template<size_t _Nm> |
| 6218 | inline constexpr _AdjacentTransform<_Nm> adjacent_transform; |
| 6219 | |
| 6220 | inline constexpr auto pairwise_transform = adjacent_transform<2>; |
| 6221 | } |
| 6222 | #endif // __cpp_lib_ranges_zip |
| 6223 | |
| 6224 | #ifdef __cpp_lib_ranges_chunk // C++ >= 23 |
| 6225 | namespace __detail |
| 6226 | { |
| 6227 | template<typename _Tp> |
| 6228 | constexpr _Tp __div_ceil(_Tp __num, _Tp __denom) |
| 6229 | { |
| 6230 | _Tp __r = __num / __denom; |
| 6231 | if (__num % __denom) |
| 6232 | ++__r; |
| 6233 | return __r; |
| 6234 | } |
| 6235 | } |
| 6236 | |
| 6237 | template<view _Vp> |
| 6238 | requires input_range<_Vp> |
| 6239 | class chunk_view : public view_interface<chunk_view<_Vp>> |
| 6240 | { |
| 6241 | _Vp _M_base; |
| 6242 | range_difference_t<_Vp> _M_n; |
| 6243 | range_difference_t<_Vp> _M_remainder = 0; |
| 6244 | __detail::__non_propagating_cache<iterator_t<_Vp>> _M_current; |
| 6245 | |
| 6246 | class _OuterIter; |
| 6247 | class _InnerIter; |
| 6248 | |
| 6249 | public: |
| 6250 | constexpr explicit |
| 6251 | chunk_view(_Vp __base, range_difference_t<_Vp> __n) |
| 6252 | : _M_base(std::move(__base)), _M_n(__n) |
| 6253 | { __glibcxx_assert(__n >= 0); } |
| 6254 | |
| 6255 | constexpr _Vp |
| 6256 | base() const & requires copy_constructible<_Vp> |
| 6257 | { return _M_base; } |
| 6258 | |
| 6259 | constexpr _Vp |
| 6260 | base() && |
| 6261 | { return std::move(_M_base); } |
| 6262 | |
| 6263 | constexpr _OuterIter |
| 6264 | begin() |
| 6265 | { |
| 6266 | _M_current = ranges::begin(_M_base); |
| 6267 | _M_remainder = _M_n; |
| 6268 | return _OuterIter(*this); |
| 6269 | } |
| 6270 | |
| 6271 | constexpr default_sentinel_t |
| 6272 | end() const noexcept |
| 6273 | { return default_sentinel; } |
| 6274 | |
| 6275 | constexpr auto |
| 6276 | size() requires sized_range<_Vp> |
| 6277 | { |
| 6278 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6279 | (ranges::distance(_M_base), _M_n)); |
| 6280 | } |
| 6281 | |
| 6282 | constexpr auto |
| 6283 | size() const requires sized_range<const _Vp> |
| 6284 | { |
| 6285 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6286 | (ranges::distance(_M_base), _M_n)); |
| 6287 | } |
| 6288 | }; |
| 6289 | |
| 6290 | template<typename _Range> |
| 6291 | chunk_view(_Range&&, range_difference_t<_Range>) -> chunk_view<views::all_t<_Range>>; |
| 6292 | |
| 6293 | template<view _Vp> |
| 6294 | requires input_range<_Vp> |
| 6295 | class chunk_view<_Vp>::_OuterIter |
| 6296 | { |
| 6297 | chunk_view* _M_parent; |
| 6298 | |
| 6299 | constexpr explicit |
| 6300 | _OuterIter(chunk_view& __parent) noexcept |
| 6301 | : _M_parent(std::__addressof(__parent)) |
| 6302 | { } |
| 6303 | |
| 6304 | friend chunk_view; |
| 6305 | |
| 6306 | public: |
| 6307 | using iterator_concept = input_iterator_tag; |
| 6308 | using difference_type = range_difference_t<_Vp>; |
| 6309 | |
| 6310 | struct value_type; |
| 6311 | |
| 6312 | _OuterIter(_OuterIter&&) = default; |
| 6313 | _OuterIter& operator=(_OuterIter&&) = default; |
| 6314 | |
| 6315 | constexpr value_type |
| 6316 | operator*() const |
| 6317 | { |
| 6318 | __glibcxx_assert(*this != default_sentinel); |
| 6319 | return value_type(*_M_parent); |
| 6320 | } |
| 6321 | |
| 6322 | constexpr _OuterIter& |
| 6323 | operator++() |
| 6324 | { |
| 6325 | __glibcxx_assert(*this != default_sentinel); |
| 6326 | ranges::advance(*_M_parent->_M_current, _M_parent->_M_remainder, |
| 6327 | ranges::end(_M_parent->_M_base)); |
| 6328 | _M_parent->_M_remainder = _M_parent->_M_n; |
| 6329 | return *this; |
| 6330 | } |
| 6331 | |
| 6332 | constexpr void |
| 6333 | operator++(int) |
| 6334 | { ++*this; } |
| 6335 | |
| 6336 | friend constexpr bool |
| 6337 | operator==(const _OuterIter& __x, default_sentinel_t) |
| 6338 | { |
| 6339 | return *__x._M_parent->_M_current == ranges::end(__x._M_parent->_M_base) |
| 6340 | && __x._M_parent->_M_remainder != 0; |
| 6341 | } |
| 6342 | |
| 6343 | friend constexpr difference_type |
| 6344 | operator-(default_sentinel_t, const _OuterIter& __x) |
| 6345 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6346 | { |
| 6347 | const auto __dist = ranges::end(__x._M_parent->_M_base) - *__x._M_parent->_M_current; |
| 6348 | |
| 6349 | if (__dist < __x._M_parent->_M_remainder) |
| 6350 | return __dist == 0 ? 0 : 1; |
| 6351 | |
| 6352 | return 1 + __detail::__div_ceil(__dist - __x._M_parent->_M_remainder, |
| 6353 | __x._M_parent->_M_n); |
| 6354 | } |
| 6355 | |
| 6356 | friend constexpr difference_type |
| 6357 | operator-(const _OuterIter& __x, default_sentinel_t __y) |
| 6358 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6359 | { return -(__y - __x); } |
| 6360 | }; |
| 6361 | |
| 6362 | template<view _Vp> |
| 6363 | requires input_range<_Vp> |
| 6364 | struct chunk_view<_Vp>::_OuterIter::value_type : view_interface<value_type> |
| 6365 | { |
| 6366 | private: |
| 6367 | chunk_view* _M_parent; |
| 6368 | |
| 6369 | constexpr explicit |
| 6370 | value_type(chunk_view& __parent) noexcept |
| 6371 | : _M_parent(std::__addressof(__parent)) |
| 6372 | { } |
| 6373 | |
| 6374 | friend _OuterIter; |
| 6375 | |
| 6376 | public: |
| 6377 | constexpr _InnerIter |
| 6378 | begin() const noexcept |
| 6379 | { return _InnerIter(*_M_parent); } |
| 6380 | |
| 6381 | constexpr default_sentinel_t |
| 6382 | end() const noexcept |
| 6383 | { return default_sentinel; } |
| 6384 | |
| 6385 | constexpr auto |
| 6386 | size() const |
| 6387 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6388 | { |
| 6389 | return __detail::__to_unsigned_like |
| 6390 | (ranges::min(_M_parent->_M_remainder, |
| 6391 | ranges::end(_M_parent->_M_base) - *_M_parent->_M_current)); |
| 6392 | } |
| 6393 | }; |
| 6394 | |
| 6395 | template<view _Vp> |
| 6396 | requires input_range<_Vp> |
| 6397 | class chunk_view<_Vp>::_InnerIter |
| 6398 | { |
| 6399 | chunk_view* _M_parent; |
| 6400 | |
| 6401 | constexpr explicit |
| 6402 | _InnerIter(chunk_view& __parent) noexcept |
| 6403 | : _M_parent(std::__addressof(__parent)) |
| 6404 | { } |
| 6405 | |
| 6406 | friend _OuterIter::value_type; |
| 6407 | |
| 6408 | public: |
| 6409 | using iterator_concept = input_iterator_tag; |
| 6410 | using difference_type = range_difference_t<_Vp>; |
| 6411 | using value_type = range_value_t<_Vp>; |
| 6412 | |
| 6413 | _InnerIter(_InnerIter&&) = default; |
| 6414 | _InnerIter& operator=(_InnerIter&&) = default; |
| 6415 | |
| 6416 | constexpr const iterator_t<_Vp>& |
| 6417 | base() const & |
| 6418 | { return *_M_parent->_M_current; } |
| 6419 | |
| 6420 | constexpr range_reference_t<_Vp> |
| 6421 | operator*() const |
| 6422 | { |
| 6423 | __glibcxx_assert(*this != default_sentinel); |
| 6424 | return **_M_parent->_M_current; |
| 6425 | } |
| 6426 | |
| 6427 | constexpr _InnerIter& |
| 6428 | operator++() |
| 6429 | { |
| 6430 | __glibcxx_assert(*this != default_sentinel); |
| 6431 | ++*_M_parent->_M_current; |
| 6432 | if (*_M_parent->_M_current == ranges::end(_M_parent->_M_base)) |
| 6433 | _M_parent->_M_remainder = 0; |
| 6434 | else |
| 6435 | --_M_parent->_M_remainder; |
| 6436 | return *this; |
| 6437 | } |
| 6438 | |
| 6439 | constexpr void |
| 6440 | operator++(int) |
| 6441 | { ++*this; } |
| 6442 | |
| 6443 | friend constexpr bool |
| 6444 | operator==(const _InnerIter& __x, default_sentinel_t) noexcept |
| 6445 | { return __x._M_parent->_M_remainder == 0; } |
| 6446 | |
| 6447 | friend constexpr difference_type |
| 6448 | operator-(default_sentinel_t, const _InnerIter& __x) |
| 6449 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6450 | { |
| 6451 | return ranges::min(__x._M_parent->_M_remainder, |
| 6452 | ranges::end(__x._M_parent->_M_base) - *__x._M_parent->_M_current); |
| 6453 | } |
| 6454 | |
| 6455 | friend constexpr difference_type |
| 6456 | operator-(const _InnerIter& __x, default_sentinel_t __y) |
| 6457 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 6458 | { return -(__y - __x); } |
| 6459 | |
| 6460 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 6461 | // 3851. chunk_view::inner-iterator missing custom iter_move and iter_swap |
| 6462 | friend constexpr range_rvalue_reference_t<_Vp> |
| 6463 | iter_move(const _InnerIter& __i) |
| 6464 | noexcept(noexcept(ranges::iter_move(*__i._M_parent->_M_current))) |
| 6465 | { return ranges::iter_move(*__i._M_parent->_M_current); } |
| 6466 | |
| 6467 | friend constexpr void |
| 6468 | iter_swap(const _InnerIter& __x, const _InnerIter& __y) |
| 6469 | noexcept(noexcept(ranges::iter_swap(*__x._M_parent->_M_current, |
| 6470 | *__x._M_parent->_M_current))) |
| 6471 | requires indirectly_swappable<iterator_t<_Vp>> |
| 6472 | { return ranges::iter_swap(*__x._M_parent->_M_current, *__y._M_parent->_M_current); } |
| 6473 | }; |
| 6474 | |
| 6475 | template<view _Vp> |
| 6476 | requires forward_range<_Vp> |
| 6477 | class chunk_view<_Vp> : public view_interface<chunk_view<_Vp>> |
| 6478 | { |
| 6479 | _Vp _M_base; |
| 6480 | range_difference_t<_Vp> _M_n; |
| 6481 | template<bool> class _Iterator; |
| 6482 | |
| 6483 | public: |
| 6484 | constexpr explicit |
| 6485 | chunk_view(_Vp __base, range_difference_t<_Vp> __n) |
| 6486 | : _M_base(std::move(__base)), _M_n(__n) |
| 6487 | { __glibcxx_assert(__n > 0); } |
| 6488 | |
| 6489 | constexpr _Vp |
| 6490 | base() const & requires copy_constructible<_Vp> |
| 6491 | { return _M_base; } |
| 6492 | |
| 6493 | constexpr _Vp |
| 6494 | base() && |
| 6495 | { return std::move(_M_base); } |
| 6496 | |
| 6497 | constexpr auto |
| 6498 | begin() requires (!__detail::__simple_view<_Vp>) |
| 6499 | { return _Iterator<false>(this, ranges::begin(_M_base)); } |
| 6500 | |
| 6501 | constexpr auto |
| 6502 | begin() const requires forward_range<const _Vp> |
| 6503 | { return _Iterator<true>(this, ranges::begin(_M_base)); } |
| 6504 | |
| 6505 | constexpr auto |
| 6506 | end() requires (!__detail::__simple_view<_Vp>) |
| 6507 | { |
| 6508 | if constexpr (common_range<_Vp> && sized_range<_Vp>) |
| 6509 | { |
| 6510 | auto __missing = (_M_n - ranges::distance(_M_base) % _M_n) % _M_n; |
| 6511 | return _Iterator<false>(this, ranges::end(_M_base), __missing); |
| 6512 | } |
| 6513 | else if constexpr (common_range<_Vp> && !bidirectional_range<_Vp>) |
| 6514 | return _Iterator<false>(this, ranges::end(_M_base)); |
| 6515 | else |
| 6516 | return default_sentinel; |
| 6517 | } |
| 6518 | |
| 6519 | constexpr auto |
| 6520 | end() const requires forward_range<const _Vp> |
| 6521 | { |
| 6522 | if constexpr (common_range<const _Vp> && sized_range<const _Vp>) |
| 6523 | { |
| 6524 | auto __missing = (_M_n - ranges::distance(_M_base) % _M_n) % _M_n; |
| 6525 | return _Iterator<true>(this, ranges::end(_M_base), __missing); |
| 6526 | } |
| 6527 | else if constexpr (common_range<const _Vp> && !bidirectional_range<const _Vp>) |
| 6528 | return _Iterator<true>(this, ranges::end(_M_base)); |
| 6529 | else |
| 6530 | return default_sentinel; |
| 6531 | } |
| 6532 | |
| 6533 | constexpr auto |
| 6534 | size() requires sized_range<_Vp> |
| 6535 | { |
| 6536 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6537 | (ranges::distance(_M_base), _M_n)); |
| 6538 | } |
| 6539 | |
| 6540 | constexpr auto |
| 6541 | size() const requires sized_range<const _Vp> |
| 6542 | { |
| 6543 | return __detail::__to_unsigned_like(__detail::__div_ceil |
| 6544 | (ranges::distance(_M_base), _M_n)); |
| 6545 | } |
| 6546 | }; |
| 6547 | |
| 6548 | template<typename _Vp> |
| 6549 | inline constexpr bool enable_borrowed_range<chunk_view<_Vp>> |
| 6550 | = forward_range<_Vp> && enable_borrowed_range<_Vp>; |
| 6551 | |
| 6552 | template<view _Vp> |
| 6553 | requires forward_range<_Vp> |
| 6554 | template<bool _Const> |
| 6555 | class chunk_view<_Vp>::_Iterator |
| 6556 | { |
| 6557 | using _Parent = __detail::__maybe_const_t<_Const, chunk_view>; |
| 6558 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 6559 | |
| 6560 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 6561 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 6562 | range_difference_t<_Base> _M_n = 0; |
| 6563 | range_difference_t<_Base> _M_missing = 0; |
| 6564 | |
| 6565 | constexpr |
| 6566 | _Iterator(_Parent* __parent, iterator_t<_Base> __current, |
| 6567 | range_difference_t<_Base> __missing = 0) |
| 6568 | : _M_current(__current), _M_end(ranges::end(__parent->_M_base)), |
| 6569 | _M_n(__parent->_M_n), _M_missing(__missing) |
| 6570 | { } |
| 6571 | |
| 6572 | static auto |
| 6573 | _S_iter_cat() |
| 6574 | { |
| 6575 | if constexpr (random_access_range<_Base>) |
| 6576 | return random_access_iterator_tag{}; |
| 6577 | else if constexpr (bidirectional_range<_Base>) |
| 6578 | return bidirectional_iterator_tag{}; |
| 6579 | else |
| 6580 | return forward_iterator_tag{}; |
| 6581 | } |
| 6582 | |
| 6583 | friend chunk_view; |
| 6584 | |
| 6585 | public: |
| 6586 | using iterator_category = input_iterator_tag; |
| 6587 | using iterator_concept = decltype(_S_iter_cat()); |
| 6588 | using value_type = decltype(views::take(subrange(_M_current, _M_end), _M_n)); |
| 6589 | using difference_type = range_difference_t<_Base>; |
| 6590 | |
| 6591 | _Iterator() = default; |
| 6592 | |
| 6593 | constexpr _Iterator(_Iterator<!_Const> __i) |
| 6594 | requires _Const |
| 6595 | && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 6596 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 6597 | : _M_current(std::move(__i._M_current)), _M_end(std::move(__i._M_end)), |
| 6598 | _M_n(__i._M_n), _M_missing(__i._M_missing) |
| 6599 | { } |
| 6600 | |
| 6601 | constexpr iterator_t<_Base> |
| 6602 | base() const |
| 6603 | { return _M_current; } |
| 6604 | |
| 6605 | constexpr value_type |
| 6606 | operator*() const |
| 6607 | { |
| 6608 | __glibcxx_assert(_M_current != _M_end); |
| 6609 | return views::take(subrange(_M_current, _M_end), _M_n); |
| 6610 | } |
| 6611 | |
| 6612 | constexpr _Iterator& |
| 6613 | operator++() |
| 6614 | { |
| 6615 | __glibcxx_assert(_M_current != _M_end); |
| 6616 | _M_missing = ranges::advance(_M_current, _M_n, _M_end); |
| 6617 | return *this; |
| 6618 | } |
| 6619 | |
| 6620 | constexpr _Iterator |
| 6621 | operator++(int) |
| 6622 | { |
| 6623 | auto __tmp = *this; |
| 6624 | ++*this; |
| 6625 | return __tmp; |
| 6626 | } |
| 6627 | |
| 6628 | constexpr _Iterator& |
| 6629 | operator--() requires bidirectional_range<_Base> |
| 6630 | { |
| 6631 | ranges::advance(_M_current, _M_missing - _M_n); |
| 6632 | _M_missing = 0; |
| 6633 | return *this; |
| 6634 | } |
| 6635 | |
| 6636 | constexpr _Iterator |
| 6637 | operator--(int) requires bidirectional_range<_Base> |
| 6638 | { |
| 6639 | auto __tmp = *this; |
| 6640 | --*this; |
| 6641 | return __tmp; |
| 6642 | } |
| 6643 | |
| 6644 | constexpr _Iterator& |
| 6645 | operator+=(difference_type __x) |
| 6646 | requires random_access_range<_Base> |
| 6647 | { |
| 6648 | if (__x > 0) |
| 6649 | { |
| 6650 | __glibcxx_assert(ranges::distance(_M_current, _M_end) > _M_n * (__x - 1)); |
| 6651 | _M_missing = ranges::advance(_M_current, _M_n * __x, _M_end); |
| 6652 | } |
| 6653 | else if (__x < 0) |
| 6654 | { |
| 6655 | ranges::advance(_M_current, _M_n * __x + _M_missing); |
| 6656 | _M_missing = 0; |
| 6657 | } |
| 6658 | return *this; |
| 6659 | } |
| 6660 | |
| 6661 | constexpr _Iterator& |
| 6662 | operator-=(difference_type __x) |
| 6663 | requires random_access_range<_Base> |
| 6664 | { return *this += -__x; } |
| 6665 | |
| 6666 | constexpr value_type |
| 6667 | operator[](difference_type __n) const |
| 6668 | requires random_access_range<_Base> |
| 6669 | { return *(*this + __n); } |
| 6670 | |
| 6671 | friend constexpr bool |
| 6672 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 6673 | { return __x._M_current == __y._M_current; } |
| 6674 | |
| 6675 | friend constexpr bool |
| 6676 | operator==(const _Iterator& __x, default_sentinel_t) |
| 6677 | { return __x._M_current == __x._M_end; } |
| 6678 | |
| 6679 | friend constexpr bool |
| 6680 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 6681 | requires random_access_range<_Base> |
| 6682 | { return __x._M_current > __y._M_current; } |
| 6683 | |
| 6684 | friend constexpr bool |
| 6685 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 6686 | requires random_access_range<_Base> |
| 6687 | { return __y < __x; } |
| 6688 | |
| 6689 | friend constexpr bool |
| 6690 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 6691 | requires random_access_range<_Base> |
| 6692 | { return !(__y < __x); } |
| 6693 | |
| 6694 | friend constexpr bool |
| 6695 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 6696 | requires random_access_range<_Base> |
| 6697 | { return !(__x < __y); } |
| 6698 | |
| 6699 | friend constexpr auto |
| 6700 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 6701 | requires random_access_range<_Base> |
| 6702 | && three_way_comparable<iterator_t<_Base>> |
| 6703 | { return __x._M_current <=> __y._M_current; } |
| 6704 | |
| 6705 | friend constexpr _Iterator |
| 6706 | operator+(const _Iterator& __i, difference_type __n) |
| 6707 | requires random_access_range<_Base> |
| 6708 | { |
| 6709 | auto __r = __i; |
| 6710 | __r += __n; |
| 6711 | return __r; |
| 6712 | } |
| 6713 | |
| 6714 | friend constexpr _Iterator |
| 6715 | operator+(difference_type __n, const _Iterator& __i) |
| 6716 | requires random_access_range<_Base> |
| 6717 | { |
| 6718 | auto __r = __i; |
| 6719 | __r += __n; |
| 6720 | return __r; |
| 6721 | } |
| 6722 | |
| 6723 | friend constexpr _Iterator |
| 6724 | operator-(const _Iterator& __i, difference_type __n) |
| 6725 | requires random_access_range<_Base> |
| 6726 | { |
| 6727 | auto __r = __i; |
| 6728 | __r -= __n; |
| 6729 | return __r; |
| 6730 | } |
| 6731 | |
| 6732 | friend constexpr difference_type |
| 6733 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 6734 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 6735 | { |
| 6736 | return (__x._M_current - __y._M_current |
| 6737 | + __x._M_missing - __y._M_missing) / __x._M_n; |
| 6738 | } |
| 6739 | |
| 6740 | friend constexpr difference_type |
| 6741 | operator-(default_sentinel_t, const _Iterator& __x) |
| 6742 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 6743 | { return __detail::__div_ceil(__x._M_end - __x._M_current, __x._M_n); } |
| 6744 | |
| 6745 | friend constexpr difference_type |
| 6746 | operator-(const _Iterator& __x, default_sentinel_t __y) |
| 6747 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 6748 | { return -(__y - __x); } |
| 6749 | }; |
| 6750 | |
| 6751 | namespace views |
| 6752 | { |
| 6753 | namespace __detail |
| 6754 | { |
| 6755 | template<typename _Range, typename _Dp> |
| 6756 | concept __can_chunk_view |
| 6757 | = requires { chunk_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 6758 | } |
| 6759 | |
| 6760 | struct _Chunk : __adaptor::_RangeAdaptor<_Chunk> |
| 6761 | { |
| 6762 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 6763 | requires __detail::__can_chunk_view<_Range, _Dp> |
| 6764 | constexpr auto |
| 6765 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 6766 | { return chunk_view(std::forward<_Range>(__r), __n); } |
| 6767 | |
| 6768 | using __adaptor::_RangeAdaptor<_Chunk>::operator(); |
| 6769 | static constexpr int _S_arity = 2; |
| 6770 | static constexpr bool _S_has_simple_extra_args = true; |
| 6771 | }; |
| 6772 | |
| 6773 | inline constexpr _Chunk chunk; |
| 6774 | } |
| 6775 | #endif // __cpp_lib_ranges_chunk |
| 6776 | |
| 6777 | #ifdef __cpp_lib_ranges_slide // C++ >= 23 |
| 6778 | namespace __detail |
| 6779 | { |
| 6780 | template<typename _Vp> |
| 6781 | concept __slide_caches_nothing = random_access_range<_Vp> && sized_range<_Vp>; |
| 6782 | |
| 6783 | template<typename _Vp> |
| 6784 | concept __slide_caches_last |
| 6785 | = !__slide_caches_nothing<_Vp> && bidirectional_range<_Vp> && common_range<_Vp>; |
| 6786 | |
| 6787 | template<typename _Vp> |
| 6788 | concept __slide_caches_first |
| 6789 | = !__slide_caches_nothing<_Vp> && !__slide_caches_last<_Vp>; |
| 6790 | } |
| 6791 | |
| 6792 | template<forward_range _Vp> |
| 6793 | requires view<_Vp> |
| 6794 | class slide_view : public view_interface<slide_view<_Vp>> |
| 6795 | { |
| 6796 | _Vp _M_base; |
| 6797 | range_difference_t<_Vp> _M_n; |
| 6798 | [[no_unique_address]] |
| 6799 | __detail::__maybe_present_t<__detail::__slide_caches_first<_Vp>, |
| 6800 | __detail::_CachedPosition<_Vp>, 0> _M_cached_begin; |
| 6801 | [[no_unique_address]] |
| 6802 | __detail::__maybe_present_t<__detail::__slide_caches_last<_Vp>, |
| 6803 | __detail::_CachedPosition<_Vp>, 1> _M_cached_end; |
| 6804 | |
| 6805 | template<bool> class _Iterator; |
| 6806 | class _Sentinel; |
| 6807 | |
| 6808 | public: |
| 6809 | constexpr explicit |
| 6810 | slide_view(_Vp __base, range_difference_t<_Vp> __n) |
| 6811 | : _M_base(std::move(__base)), _M_n(__n) |
| 6812 | { __glibcxx_assert(__n > 0); } |
| 6813 | |
| 6814 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 6815 | // 3848. adjacent_view, adjacent_transform_view and slide_view missing base accessor |
| 6816 | constexpr _Vp |
| 6817 | base() const & requires copy_constructible<_Vp> |
| 6818 | { return _M_base; } |
| 6819 | |
| 6820 | constexpr _Vp |
| 6821 | base() && |
| 6822 | { return std::move(_M_base); } |
| 6823 | |
| 6824 | constexpr auto |
| 6825 | begin() requires (!(__detail::__simple_view<_Vp> |
| 6826 | && __detail::__slide_caches_nothing<const _Vp>)) |
| 6827 | { |
| 6828 | if constexpr (__detail::__slide_caches_first<_Vp>) |
| 6829 | { |
| 6830 | iterator_t<_Vp> __it; |
| 6831 | if (_M_cached_begin._M_has_value()) |
| 6832 | __it = _M_cached_begin._M_get(_M_base); |
| 6833 | else |
| 6834 | { |
| 6835 | __it = ranges::next(ranges::begin(_M_base), _M_n - 1, ranges::end(_M_base)); |
| 6836 | _M_cached_begin._M_set(_M_base, __it); |
| 6837 | } |
| 6838 | return _Iterator<false>(ranges::begin(_M_base), std::move(__it), _M_n); |
| 6839 | } |
| 6840 | else |
| 6841 | return _Iterator<false>(ranges::begin(_M_base), _M_n); |
| 6842 | } |
| 6843 | |
| 6844 | constexpr auto |
| 6845 | begin() const requires __detail::__slide_caches_nothing<const _Vp> |
| 6846 | { return _Iterator<true>(ranges::begin(_M_base), _M_n); } |
| 6847 | |
| 6848 | constexpr auto |
| 6849 | end() requires (!(__detail::__simple_view<_Vp> |
| 6850 | && __detail::__slide_caches_nothing<const _Vp>)) |
| 6851 | { |
| 6852 | if constexpr (__detail::__slide_caches_nothing<_Vp>) |
| 6853 | return _Iterator<false>(ranges::begin(_M_base) + range_difference_t<_Vp>(size()), |
| 6854 | _M_n); |
| 6855 | else if constexpr (__detail::__slide_caches_last<_Vp>) |
| 6856 | { |
| 6857 | iterator_t<_Vp> __it; |
| 6858 | if (_M_cached_end._M_has_value()) |
| 6859 | __it = _M_cached_end._M_get(_M_base); |
| 6860 | else |
| 6861 | { |
| 6862 | __it = ranges::prev(ranges::end(_M_base), _M_n - 1, ranges::begin(_M_base)); |
| 6863 | _M_cached_end._M_set(_M_base, __it); |
| 6864 | } |
| 6865 | return _Iterator<false>(std::move(__it), _M_n); |
| 6866 | } |
| 6867 | else if constexpr (common_range<_Vp>) |
| 6868 | return _Iterator<false>(ranges::end(_M_base), ranges::end(_M_base), _M_n); |
| 6869 | else |
| 6870 | return _Sentinel(ranges::end(_M_base)); |
| 6871 | } |
| 6872 | |
| 6873 | constexpr auto |
| 6874 | end() const requires __detail::__slide_caches_nothing<const _Vp> |
| 6875 | { return begin() + range_difference_t<const _Vp>(size()); } |
| 6876 | |
| 6877 | constexpr auto |
| 6878 | size() requires sized_range<_Vp> |
| 6879 | { |
| 6880 | auto __sz = ranges::distance(_M_base) - _M_n + 1; |
| 6881 | if (__sz < 0) |
| 6882 | __sz = 0; |
| 6883 | return __detail::__to_unsigned_like(__sz); |
| 6884 | } |
| 6885 | |
| 6886 | constexpr auto |
| 6887 | size() const requires sized_range<const _Vp> |
| 6888 | { |
| 6889 | auto __sz = ranges::distance(_M_base) - _M_n + 1; |
| 6890 | if (__sz < 0) |
| 6891 | __sz = 0; |
| 6892 | return __detail::__to_unsigned_like(__sz); |
| 6893 | } |
| 6894 | }; |
| 6895 | |
| 6896 | template<typename _Range> |
| 6897 | slide_view(_Range&&, range_difference_t<_Range>) -> slide_view<views::all_t<_Range>>; |
| 6898 | |
| 6899 | template<typename _Vp> |
| 6900 | inline constexpr bool enable_borrowed_range<slide_view<_Vp>> |
| 6901 | = enable_borrowed_range<_Vp>; |
| 6902 | |
| 6903 | template<forward_range _Vp> |
| 6904 | requires view<_Vp> |
| 6905 | template<bool _Const> |
| 6906 | class slide_view<_Vp>::_Iterator |
| 6907 | { |
| 6908 | using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 6909 | static constexpr bool _S_last_elt_present |
| 6910 | = __detail::__slide_caches_first<_Base>; |
| 6911 | |
| 6912 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 6913 | [[no_unique_address]] |
| 6914 | __detail::__maybe_present_t<_S_last_elt_present, iterator_t<_Base>> |
| 6915 | _M_last_elt = decltype(_M_last_elt)(); |
| 6916 | range_difference_t<_Base> _M_n = 0; |
| 6917 | |
| 6918 | constexpr |
| 6919 | _Iterator(iterator_t<_Base> __current, range_difference_t<_Base> __n) |
| 6920 | requires (!_S_last_elt_present) |
| 6921 | : _M_current(__current), _M_n(__n) |
| 6922 | { } |
| 6923 | |
| 6924 | constexpr |
| 6925 | _Iterator(iterator_t<_Base> __current, iterator_t<_Base> __last_elt, |
| 6926 | range_difference_t<_Base> __n) |
| 6927 | requires _S_last_elt_present |
| 6928 | : _M_current(__current), _M_last_elt(__last_elt), _M_n(__n) |
| 6929 | { } |
| 6930 | |
| 6931 | static auto |
| 6932 | _S_iter_concept() |
| 6933 | { |
| 6934 | if constexpr (random_access_range<_Base>) |
| 6935 | return random_access_iterator_tag{}; |
| 6936 | else if constexpr (bidirectional_range<_Base>) |
| 6937 | return bidirectional_iterator_tag{}; |
| 6938 | else |
| 6939 | return forward_iterator_tag{}; |
| 6940 | } |
| 6941 | |
| 6942 | friend slide_view; |
| 6943 | friend slide_view::_Sentinel; |
| 6944 | |
| 6945 | public: |
| 6946 | using iterator_category = input_iterator_tag; |
| 6947 | using iterator_concept = decltype(_S_iter_concept()); |
| 6948 | using value_type = decltype(views::counted(_M_current, _M_n)); |
| 6949 | using difference_type = range_difference_t<_Base>; |
| 6950 | |
| 6951 | _Iterator() = default; |
| 6952 | |
| 6953 | constexpr |
| 6954 | _Iterator(_Iterator<!_Const> __i) |
| 6955 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 6956 | : _M_current(std::move(__i._M_current)), _M_n(__i._M_n) |
| 6957 | { } |
| 6958 | |
| 6959 | constexpr auto |
| 6960 | operator*() const |
| 6961 | { return views::counted(_M_current, _M_n); } |
| 6962 | |
| 6963 | constexpr _Iterator& |
| 6964 | operator++() |
| 6965 | { |
| 6966 | ++_M_current; |
| 6967 | if constexpr (_S_last_elt_present) |
| 6968 | ++_M_last_elt; |
| 6969 | return *this; |
| 6970 | } |
| 6971 | |
| 6972 | constexpr _Iterator |
| 6973 | operator++(int) |
| 6974 | { |
| 6975 | auto __tmp = *this; |
| 6976 | ++*this; |
| 6977 | return __tmp; |
| 6978 | } |
| 6979 | |
| 6980 | constexpr _Iterator& |
| 6981 | operator--() requires bidirectional_range<_Base> |
| 6982 | { |
| 6983 | --_M_current; |
| 6984 | if constexpr (_S_last_elt_present) |
| 6985 | --_M_last_elt; |
| 6986 | return *this; |
| 6987 | } |
| 6988 | |
| 6989 | constexpr _Iterator |
| 6990 | operator--(int) requires bidirectional_range<_Base> |
| 6991 | { |
| 6992 | auto __tmp = *this; |
| 6993 | --*this; |
| 6994 | return __tmp; |
| 6995 | } |
| 6996 | |
| 6997 | constexpr _Iterator& |
| 6998 | operator+=(difference_type __x) |
| 6999 | requires random_access_range<_Base> |
| 7000 | { |
| 7001 | _M_current += __x; |
| 7002 | if constexpr (_S_last_elt_present) |
| 7003 | _M_last_elt += __x; |
| 7004 | return *this; |
| 7005 | } |
| 7006 | |
| 7007 | constexpr _Iterator& |
| 7008 | operator-=(difference_type __x) |
| 7009 | requires random_access_range<_Base> |
| 7010 | { |
| 7011 | _M_current -= __x; |
| 7012 | if constexpr (_S_last_elt_present) |
| 7013 | _M_last_elt -= __x; |
| 7014 | return *this; |
| 7015 | } |
| 7016 | |
| 7017 | constexpr auto |
| 7018 | operator[](difference_type __n) const |
| 7019 | requires random_access_range<_Base> |
| 7020 | { return views::counted(_M_current + __n, _M_n); } |
| 7021 | |
| 7022 | friend constexpr bool |
| 7023 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 7024 | { |
| 7025 | if constexpr (_S_last_elt_present) |
| 7026 | return __x._M_last_elt == __y._M_last_elt; |
| 7027 | else |
| 7028 | return __x._M_current == __y._M_current; |
| 7029 | } |
| 7030 | |
| 7031 | friend constexpr bool |
| 7032 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 7033 | requires random_access_range<_Base> |
| 7034 | { return __x._M_current < __y._M_current; } |
| 7035 | |
| 7036 | friend constexpr bool |
| 7037 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 7038 | requires random_access_range<_Base> |
| 7039 | { return __y < __x; } |
| 7040 | |
| 7041 | friend constexpr bool |
| 7042 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 7043 | requires random_access_range<_Base> |
| 7044 | { return !(__y < __x); } |
| 7045 | |
| 7046 | friend constexpr bool |
| 7047 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 7048 | requires random_access_range<_Base> |
| 7049 | { return !(__x < __y); } |
| 7050 | |
| 7051 | friend constexpr auto |
| 7052 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 7053 | requires random_access_range<_Base> |
| 7054 | && three_way_comparable<iterator_t<_Base>> |
| 7055 | { return __x._M_current <=> __y._M_current; } |
| 7056 | |
| 7057 | friend constexpr _Iterator |
| 7058 | operator+(const _Iterator& __i, difference_type __n) |
| 7059 | requires random_access_range<_Base> |
| 7060 | { |
| 7061 | auto __r = __i; |
| 7062 | __r += __n; |
| 7063 | return __r; |
| 7064 | } |
| 7065 | |
| 7066 | friend constexpr _Iterator |
| 7067 | operator+(difference_type __n, const _Iterator& __i) |
| 7068 | requires random_access_range<_Base> |
| 7069 | { |
| 7070 | auto __r = __i; |
| 7071 | __r += __n; |
| 7072 | return __r; |
| 7073 | } |
| 7074 | |
| 7075 | friend constexpr _Iterator |
| 7076 | operator-(const _Iterator& __i, difference_type __n) |
| 7077 | requires random_access_range<_Base> |
| 7078 | { |
| 7079 | auto __r = __i; |
| 7080 | __r -= __n; |
| 7081 | return __r; |
| 7082 | } |
| 7083 | |
| 7084 | friend constexpr difference_type |
| 7085 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 7086 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 7087 | { |
| 7088 | if constexpr (_S_last_elt_present) |
| 7089 | return __x._M_last_elt - __y._M_last_elt; |
| 7090 | else |
| 7091 | return __x._M_current - __y._M_current; |
| 7092 | } |
| 7093 | }; |
| 7094 | |
| 7095 | template<forward_range _Vp> |
| 7096 | requires view<_Vp> |
| 7097 | class slide_view<_Vp>::_Sentinel |
| 7098 | { |
| 7099 | sentinel_t<_Vp> _M_end = sentinel_t<_Vp>(); |
| 7100 | |
| 7101 | constexpr explicit |
| 7102 | _Sentinel(sentinel_t<_Vp> __end) |
| 7103 | : _M_end(__end) |
| 7104 | { } |
| 7105 | |
| 7106 | friend slide_view; |
| 7107 | |
| 7108 | public: |
| 7109 | _Sentinel() = default; |
| 7110 | |
| 7111 | friend constexpr bool |
| 7112 | operator==(const _Iterator<false>& __x, const _Sentinel& __y) |
| 7113 | { return __x._M_last_elt == __y._M_end; } |
| 7114 | |
| 7115 | friend constexpr range_difference_t<_Vp> |
| 7116 | operator-(const _Iterator<false>& __x, const _Sentinel& __y) |
| 7117 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 7118 | { return __x._M_last_elt - __y._M_end; } |
| 7119 | |
| 7120 | friend constexpr range_difference_t<_Vp> |
| 7121 | operator-(const _Sentinel& __y, const _Iterator<false>& __x) |
| 7122 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 7123 | { return __y._M_end -__x._M_last_elt; } |
| 7124 | }; |
| 7125 | |
| 7126 | namespace views |
| 7127 | { |
| 7128 | namespace __detail |
| 7129 | { |
| 7130 | template<typename _Range, typename _Dp> |
| 7131 | concept __can_slide_view |
| 7132 | = requires { slide_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 7133 | } |
| 7134 | |
| 7135 | struct _Slide : __adaptor::_RangeAdaptor<_Slide> |
| 7136 | { |
| 7137 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 7138 | requires __detail::__can_slide_view<_Range, _Dp> |
| 7139 | constexpr auto |
| 7140 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 7141 | { return slide_view(std::forward<_Range>(__r), __n); } |
| 7142 | |
| 7143 | using __adaptor::_RangeAdaptor<_Slide>::operator(); |
| 7144 | static constexpr int _S_arity = 2; |
| 7145 | static constexpr bool _S_has_simple_extra_args = true; |
| 7146 | }; |
| 7147 | |
| 7148 | inline constexpr _Slide slide; |
| 7149 | } |
| 7150 | #endif // __cpp_lib_ranges_slide |
| 7151 | |
| 7152 | #ifdef __cpp_lib_ranges_chunk_by // C++ >= 23 |
| 7153 | template<forward_range _Vp, |
| 7154 | indirect_binary_predicate<iterator_t<_Vp>, iterator_t<_Vp>> _Pred> |
| 7155 | requires view<_Vp> && is_object_v<_Pred> |
| 7156 | class chunk_by_view : public view_interface<chunk_by_view<_Vp, _Pred>> |
| 7157 | { |
| 7158 | _Vp _M_base = _Vp(); |
| 7159 | __detail::__box<_Pred> _M_pred; |
| 7160 | __detail::_CachedPosition<_Vp> _M_cached_begin; |
| 7161 | |
| 7162 | constexpr iterator_t<_Vp> |
| 7163 | _M_find_next(iterator_t<_Vp> __current) |
| 7164 | { |
| 7165 | __glibcxx_assert(_M_pred.has_value()); |
| 7166 | auto __pred = [this]<typename _Tp, typename _Up>(_Tp&& __x, _Up&& __y) { |
| 7167 | return !bool((*_M_pred)(std::forward<_Tp>(__x), std::forward<_Up>(__y))); |
| 7168 | }; |
| 7169 | auto __it = ranges::adjacent_find(__current, ranges::end(_M_base), __pred); |
| 7170 | return ranges::next(__it, 1, ranges::end(_M_base)); |
| 7171 | } |
| 7172 | |
| 7173 | constexpr iterator_t<_Vp> |
| 7174 | _M_find_prev(iterator_t<_Vp> __current) requires bidirectional_range<_Vp> |
| 7175 | { |
| 7176 | __glibcxx_assert(_M_pred.has_value()); |
| 7177 | auto __pred = [this]<typename _Tp, typename _Up>(_Tp&& __x, _Up&& __y) { |
| 7178 | return !bool((*_M_pred)(std::forward<_Up>(__y), std::forward<_Tp>(__x))); |
| 7179 | }; |
| 7180 | auto __rbegin = std::make_reverse_iterator(__current); |
| 7181 | auto __rend = std::make_reverse_iterator(ranges::begin(_M_base)); |
| 7182 | __glibcxx_assert(__rbegin != __rend); |
| 7183 | auto __it = ranges::adjacent_find(__rbegin, __rend, __pred).base(); |
| 7184 | return ranges::prev(__it, 1, ranges::begin(_M_base)); |
| 7185 | } |
| 7186 | |
| 7187 | class _Iterator; |
| 7188 | |
| 7189 | public: |
| 7190 | chunk_by_view() requires (default_initializable<_Vp> |
| 7191 | && default_initializable<_Pred>) |
| 7192 | = default; |
| 7193 | |
| 7194 | constexpr explicit |
| 7195 | chunk_by_view(_Vp __base, _Pred __pred) |
| 7196 | : _M_base(std::move(__base)), _M_pred(std::move(__pred)) |
| 7197 | { } |
| 7198 | |
| 7199 | constexpr _Vp |
| 7200 | base() const & requires copy_constructible<_Vp> |
| 7201 | { return _M_base; } |
| 7202 | |
| 7203 | constexpr _Vp |
| 7204 | base() && |
| 7205 | { return std::move(_M_base); } |
| 7206 | |
| 7207 | constexpr const _Pred& |
| 7208 | pred() const |
| 7209 | { return *_M_pred; } |
| 7210 | |
| 7211 | constexpr _Iterator |
| 7212 | begin() |
| 7213 | { |
| 7214 | __glibcxx_assert(_M_pred.has_value()); |
| 7215 | iterator_t<_Vp> __it; |
| 7216 | if (_M_cached_begin._M_has_value()) |
| 7217 | __it = _M_cached_begin._M_get(_M_base); |
| 7218 | else |
| 7219 | { |
| 7220 | __it = _M_find_next(ranges::begin(_M_base)); |
| 7221 | _M_cached_begin._M_set(_M_base, __it); |
| 7222 | } |
| 7223 | return _Iterator(*this, ranges::begin(_M_base), __it); |
| 7224 | } |
| 7225 | |
| 7226 | constexpr auto |
| 7227 | end() |
| 7228 | { |
| 7229 | if constexpr (common_range<_Vp>) |
| 7230 | return _Iterator(*this, ranges::end(_M_base), ranges::end(_M_base)); |
| 7231 | else |
| 7232 | return default_sentinel; |
| 7233 | } |
| 7234 | }; |
| 7235 | |
| 7236 | template<typename _Range, typename _Pred> |
| 7237 | chunk_by_view(_Range&&, _Pred) -> chunk_by_view<views::all_t<_Range>, _Pred>; |
| 7238 | |
| 7239 | template<forward_range _Vp, |
| 7240 | indirect_binary_predicate<iterator_t<_Vp>, iterator_t<_Vp>> _Pred> |
| 7241 | requires view<_Vp> && is_object_v<_Pred> |
| 7242 | class chunk_by_view<_Vp, _Pred>::_Iterator |
| 7243 | { |
| 7244 | chunk_by_view* _M_parent = nullptr; |
| 7245 | iterator_t<_Vp> _M_current = iterator_t<_Vp>(); |
| 7246 | iterator_t<_Vp> _M_next = iterator_t<_Vp>(); |
| 7247 | |
| 7248 | constexpr |
| 7249 | _Iterator(chunk_by_view& __parent, iterator_t<_Vp> __current, iterator_t<_Vp> __next) |
| 7250 | : _M_parent(std::__addressof(__parent)), _M_current(__current), _M_next(__next) |
| 7251 | { } |
| 7252 | |
| 7253 | static auto |
| 7254 | _S_iter_concept() |
| 7255 | { |
| 7256 | if constexpr (bidirectional_range<_Vp>) |
| 7257 | return bidirectional_iterator_tag{}; |
| 7258 | else |
| 7259 | return forward_iterator_tag{}; |
| 7260 | } |
| 7261 | |
| 7262 | friend chunk_by_view; |
| 7263 | |
| 7264 | public: |
| 7265 | using value_type = subrange<iterator_t<_Vp>>; |
| 7266 | using difference_type = range_difference_t<_Vp>; |
| 7267 | using iterator_category = input_iterator_tag; |
| 7268 | using iterator_concept = decltype(_S_iter_concept()); |
| 7269 | |
| 7270 | _Iterator() = default; |
| 7271 | |
| 7272 | constexpr value_type |
| 7273 | operator*() const |
| 7274 | { |
| 7275 | __glibcxx_assert(_M_current != _M_next); |
| 7276 | return ranges::subrange(_M_current, _M_next); |
| 7277 | } |
| 7278 | |
| 7279 | constexpr _Iterator& |
| 7280 | operator++() |
| 7281 | { |
| 7282 | __glibcxx_assert(_M_current != _M_next); |
| 7283 | _M_current = _M_next; |
| 7284 | _M_next = _M_parent->_M_find_next(_M_current); |
| 7285 | return *this; |
| 7286 | } |
| 7287 | |
| 7288 | constexpr _Iterator |
| 7289 | operator++(int) |
| 7290 | { |
| 7291 | auto __tmp = *this; |
| 7292 | ++*this; |
| 7293 | return __tmp; |
| 7294 | } |
| 7295 | |
| 7296 | constexpr _Iterator& |
| 7297 | operator--() requires bidirectional_range<_Vp> |
| 7298 | { |
| 7299 | _M_next = _M_current; |
| 7300 | _M_current = _M_parent->_M_find_prev(_M_next); |
| 7301 | return *this; |
| 7302 | } |
| 7303 | |
| 7304 | constexpr _Iterator |
| 7305 | operator--(int) requires bidirectional_range<_Vp> |
| 7306 | { |
| 7307 | auto __tmp = *this; |
| 7308 | --*this; |
| 7309 | return __tmp; |
| 7310 | } |
| 7311 | |
| 7312 | friend constexpr bool |
| 7313 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 7314 | { return __x._M_current == __y._M_current; } |
| 7315 | |
| 7316 | friend constexpr bool |
| 7317 | operator==(const _Iterator& __x, default_sentinel_t) |
| 7318 | { return __x._M_current == __x._M_next; } |
| 7319 | }; |
| 7320 | |
| 7321 | namespace views |
| 7322 | { |
| 7323 | namespace __detail |
| 7324 | { |
| 7325 | template<typename _Range, typename _Pred> |
| 7326 | concept __can_chunk_by_view |
| 7327 | = requires { chunk_by_view(std::declval<_Range>(), std::declval<_Pred>()); }; |
| 7328 | } |
| 7329 | |
| 7330 | struct _ChunkBy : __adaptor::_RangeAdaptor<_ChunkBy> |
| 7331 | { |
| 7332 | template<viewable_range _Range, typename _Pred> |
| 7333 | requires __detail::__can_chunk_by_view<_Range, _Pred> |
| 7334 | constexpr auto |
| 7335 | operator() [[nodiscard]] (_Range&& __r, _Pred&& __pred) const |
| 7336 | { return chunk_by_view(std::forward<_Range>(__r), std::forward<_Pred>(__pred)); } |
| 7337 | |
| 7338 | using __adaptor::_RangeAdaptor<_ChunkBy>::operator(); |
| 7339 | static constexpr int _S_arity = 2; |
| 7340 | static constexpr bool _S_has_simple_extra_args = true; |
| 7341 | }; |
| 7342 | |
| 7343 | inline constexpr _ChunkBy chunk_by; |
| 7344 | } |
| 7345 | #endif // __cpp_lib_ranges_chunk_by |
| 7346 | |
| 7347 | #ifdef __cpp_lib_ranges_join_with // C++ >= 23 |
| 7348 | namespace __detail |
| 7349 | { |
| 7350 | template<typename _Range, typename _Pattern> |
| 7351 | concept __compatible_joinable_ranges |
| 7352 | = common_with<range_value_t<_Range>, range_value_t<_Pattern>> |
| 7353 | && common_reference_with<range_reference_t<_Range>, |
| 7354 | range_reference_t<_Pattern>> |
| 7355 | && common_reference_with<range_rvalue_reference_t<_Range>, |
| 7356 | range_rvalue_reference_t<_Pattern>>; |
| 7357 | |
| 7358 | template<typename _Range> |
| 7359 | concept __bidirectional_common = bidirectional_range<_Range> && common_range<_Range>; |
| 7360 | } |
| 7361 | |
| 7362 | template<input_range _Vp, forward_range _Pattern> |
| 7363 | requires view<_Vp> && view<_Pattern> |
| 7364 | && input_range<range_reference_t<_Vp>> |
| 7365 | && __detail::__compatible_joinable_ranges<range_reference_t<_Vp>, _Pattern> |
| 7366 | class join_with_view : public view_interface<join_with_view<_Vp, _Pattern>> |
| 7367 | { |
| 7368 | using _InnerRange = range_reference_t<_Vp>; |
| 7369 | |
| 7370 | _Vp _M_base = _Vp(); |
| 7371 | [[no_unique_address]] |
| 7372 | __detail::__maybe_present_t<!forward_range<_Vp>, |
| 7373 | __detail::__non_propagating_cache<iterator_t<_Vp>>> _M_outer_it; |
| 7374 | __detail::__non_propagating_cache<remove_cv_t<_InnerRange>> _M_inner; |
| 7375 | _Pattern _M_pattern = _Pattern(); |
| 7376 | |
| 7377 | template<bool _Const> using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 7378 | template<bool _Const> using _InnerBase = range_reference_t<_Base<_Const>>; |
| 7379 | template<bool _Const> using _PatternBase = __detail::__maybe_const_t<_Const, _Pattern>; |
| 7380 | |
| 7381 | template<bool _Const> using _OuterIter = iterator_t<_Base<_Const>>; |
| 7382 | template<bool _Const> using _InnerIter = iterator_t<_InnerBase<_Const>>; |
| 7383 | template<bool _Const> using _PatternIter = iterator_t<_PatternBase<_Const>>; |
| 7384 | |
| 7385 | template<bool _Const> |
| 7386 | static constexpr bool _S_ref_is_glvalue = is_reference_v<_InnerBase<_Const>>; |
| 7387 | |
| 7388 | template<bool _Const> |
| 7389 | struct __iter_cat |
| 7390 | { }; |
| 7391 | |
| 7392 | template<bool _Const> |
| 7393 | requires _S_ref_is_glvalue<_Const> |
| 7394 | && forward_range<_Base<_Const>> |
| 7395 | && forward_range<_InnerBase<_Const>> |
| 7396 | struct __iter_cat<_Const> |
| 7397 | { |
| 7398 | private: |
| 7399 | static auto |
| 7400 | _S_iter_cat() |
| 7401 | { |
| 7402 | using _OuterIter = join_with_view::_OuterIter<_Const>; |
| 7403 | using _InnerIter = join_with_view::_InnerIter<_Const>; |
| 7404 | using _PatternIter = join_with_view::_PatternIter<_Const>; |
| 7405 | using _OuterCat = typename iterator_traits<_OuterIter>::iterator_category; |
| 7406 | using _InnerCat = typename iterator_traits<_InnerIter>::iterator_category; |
| 7407 | using _PatternCat = typename iterator_traits<_PatternIter>::iterator_category; |
| 7408 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 7409 | // 3798. Rvalue reference and iterator_category |
| 7410 | if constexpr (!is_reference_v<common_reference_t<iter_reference_t<_InnerIter>, |
| 7411 | iter_reference_t<_PatternIter>>>) |
| 7412 | return input_iterator_tag{}; |
| 7413 | else if constexpr (derived_from<_OuterCat, bidirectional_iterator_tag> |
| 7414 | && derived_from<_InnerCat, bidirectional_iterator_tag> |
| 7415 | && derived_from<_PatternCat, bidirectional_iterator_tag> |
| 7416 | && common_range<_InnerBase<_Const>> |
| 7417 | && common_range<_PatternBase<_Const>>) |
| 7418 | return bidirectional_iterator_tag{}; |
| 7419 | else if constexpr (derived_from<_OuterCat, forward_iterator_tag> |
| 7420 | && derived_from<_InnerCat, forward_iterator_tag> |
| 7421 | && derived_from<_PatternCat, forward_iterator_tag>) |
| 7422 | return forward_iterator_tag{}; |
| 7423 | else |
| 7424 | return input_iterator_tag{}; |
| 7425 | } |
| 7426 | public: |
| 7427 | using iterator_category = decltype(_S_iter_cat()); |
| 7428 | }; |
| 7429 | |
| 7430 | template<bool> class _Iterator; |
| 7431 | template<bool> class _Sentinel; |
| 7432 | |
| 7433 | public: |
| 7434 | join_with_view() requires (default_initializable<_Vp> |
| 7435 | && default_initializable<_Pattern>) |
| 7436 | = default; |
| 7437 | |
| 7438 | constexpr explicit |
| 7439 | join_with_view(_Vp __base, _Pattern __pattern) |
| 7440 | : _M_base(std::move(__base)), _M_pattern(std::move(__pattern)) |
| 7441 | { } |
| 7442 | |
| 7443 | template<input_range _Range> |
| 7444 | requires constructible_from<_Vp, views::all_t<_Range>> |
| 7445 | && constructible_from<_Pattern, single_view<range_value_t<_InnerRange>>> |
| 7446 | constexpr explicit |
| 7447 | join_with_view(_Range&& __r, range_value_t<_InnerRange> __e) |
| 7448 | : _M_base(views::all(std::forward<_Range>(__r))), |
| 7449 | _M_pattern(views::single(std::move(__e))) |
| 7450 | { } |
| 7451 | |
| 7452 | constexpr _Vp |
| 7453 | base() const& requires copy_constructible<_Vp> |
| 7454 | { return _M_base; } |
| 7455 | |
| 7456 | constexpr _Vp |
| 7457 | base() && |
| 7458 | { return std::move(_M_base); } |
| 7459 | |
| 7460 | constexpr auto |
| 7461 | begin() |
| 7462 | { |
| 7463 | if constexpr (forward_range<_Vp>) |
| 7464 | { |
| 7465 | constexpr bool __use_const = is_reference_v<_InnerRange> |
| 7466 | && __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 7467 | return _Iterator<__use_const>{*this, ranges::begin(_M_base)}; |
| 7468 | } |
| 7469 | else |
| 7470 | { |
| 7471 | _M_outer_it = ranges::begin(_M_base); |
| 7472 | return _Iterator<false>{*this}; |
| 7473 | } |
| 7474 | } |
| 7475 | |
| 7476 | constexpr auto |
| 7477 | begin() const |
| 7478 | requires forward_range<const _Vp> |
| 7479 | && forward_range<const _Pattern> |
| 7480 | && is_reference_v<range_reference_t<const _Vp>> |
| 7481 | && input_range<range_reference_t<const _Vp>> |
| 7482 | { return _Iterator<true>{*this, ranges::begin(_M_base)}; } |
| 7483 | |
| 7484 | constexpr auto |
| 7485 | end() |
| 7486 | { |
| 7487 | constexpr bool __use_const |
| 7488 | = __detail::__simple_view<_Vp> && __detail::__simple_view<_Pattern>; |
| 7489 | if constexpr (is_reference_v<_InnerRange> |
| 7490 | && forward_range<_Vp> && common_range<_Vp> |
| 7491 | && forward_range<_InnerRange> && common_range<_InnerRange>) |
| 7492 | return _Iterator<__use_const>{*this, ranges::end(_M_base)}; |
| 7493 | else |
| 7494 | return _Sentinel<__use_const>{*this}; |
| 7495 | } |
| 7496 | |
| 7497 | constexpr auto |
| 7498 | end() const |
| 7499 | requires forward_range<const _Vp> |
| 7500 | && forward_range<const _Pattern> |
| 7501 | && is_reference_v<range_reference_t<const _Vp>> |
| 7502 | && input_range<range_reference_t<const _Vp>> |
| 7503 | { |
| 7504 | using _InnerConstRange = range_reference_t<const _Vp>; |
| 7505 | if constexpr (forward_range<_InnerConstRange> |
| 7506 | && common_range<const _Vp> |
| 7507 | && common_range<_InnerConstRange>) |
| 7508 | return _Iterator<true>{*this, ranges::end(_M_base)}; |
| 7509 | else |
| 7510 | return _Sentinel<true>{*this}; |
| 7511 | } |
| 7512 | }; |
| 7513 | |
| 7514 | template<typename _Range, typename _Pattern> |
| 7515 | join_with_view(_Range&&, _Pattern&&) |
| 7516 | -> join_with_view<views::all_t<_Range>, views::all_t<_Pattern>>; |
| 7517 | |
| 7518 | template<input_range _Range> |
| 7519 | join_with_view(_Range&&, range_value_t<range_reference_t<_Range>>) |
| 7520 | -> join_with_view<views::all_t<_Range>, |
| 7521 | single_view<range_value_t<range_reference_t<_Range>>>>; |
| 7522 | |
| 7523 | template<input_range _Vp, forward_range _Pattern> |
| 7524 | requires view<_Vp> && view<_Pattern> |
| 7525 | && input_range<range_reference_t<_Vp>> |
| 7526 | && __detail::__compatible_joinable_ranges<range_reference_t<_Vp>, _Pattern> |
| 7527 | template<bool _Const> |
| 7528 | class join_with_view<_Vp, _Pattern>::_Iterator : public __iter_cat<_Const> |
| 7529 | { |
| 7530 | using _Parent = __detail::__maybe_const_t<_Const, join_with_view>; |
| 7531 | using _Base = join_with_view::_Base<_Const>; |
| 7532 | using _InnerBase = join_with_view::_InnerBase<_Const>; |
| 7533 | using _PatternBase = join_with_view::_PatternBase<_Const>; |
| 7534 | |
| 7535 | using _OuterIter = join_with_view::_OuterIter<_Const>; |
| 7536 | using _InnerIter = join_with_view::_InnerIter<_Const>; |
| 7537 | using _PatternIter = join_with_view::_PatternIter<_Const>; |
| 7538 | |
| 7539 | static constexpr bool _S_ref_is_glvalue = join_with_view::_S_ref_is_glvalue<_Const>; |
| 7540 | |
| 7541 | _Parent* _M_parent = nullptr; |
| 7542 | [[no_unique_address]] |
| 7543 | __detail::__maybe_present_t<forward_range<_Base>, _OuterIter> _M_outer_it |
| 7544 | = decltype(_M_outer_it)(); |
| 7545 | variant<_PatternIter, _InnerIter> _M_inner_it; |
| 7546 | |
| 7547 | constexpr _OuterIter& |
| 7548 | _M_get_outer() |
| 7549 | { |
| 7550 | if constexpr (forward_range<_Base>) |
| 7551 | return _M_outer_it; |
| 7552 | else |
| 7553 | return *_M_parent->_M_outer_it; |
| 7554 | } |
| 7555 | |
| 7556 | constexpr const _OuterIter& |
| 7557 | _M_get_outer() const |
| 7558 | { |
| 7559 | if constexpr (forward_range<_Base>) |
| 7560 | return _M_outer_it; |
| 7561 | else |
| 7562 | return *_M_parent->_M_outer_it; |
| 7563 | } |
| 7564 | |
| 7565 | constexpr |
| 7566 | _Iterator(_Parent& __parent, _OuterIter __outer) |
| 7567 | requires forward_range<_Base> |
| 7568 | : _M_parent(std::__addressof(__parent)), _M_outer_it(std::move(__outer)) |
| 7569 | { |
| 7570 | if (_M_get_outer() != ranges::end(_M_parent->_M_base)) |
| 7571 | { |
| 7572 | auto&& __inner = _M_update_inner(); |
| 7573 | _M_inner_it.template emplace<1>(ranges::begin(__inner)); |
| 7574 | _M_satisfy(); |
| 7575 | } |
| 7576 | } |
| 7577 | |
| 7578 | constexpr |
| 7579 | _Iterator(_Parent& __parent) |
| 7580 | requires (!forward_range<_Base>) |
| 7581 | : _M_parent(std::__addressof(__parent)) |
| 7582 | { |
| 7583 | if (_M_get_outer() != ranges::end(_M_parent->_M_base)) |
| 7584 | { |
| 7585 | auto&& __inner = _M_update_inner(); |
| 7586 | _M_inner_it.template emplace<1>(ranges::begin(__inner)); |
| 7587 | _M_satisfy(); |
| 7588 | } |
| 7589 | } |
| 7590 | |
| 7591 | constexpr auto& |
| 7592 | _M_update_inner() |
| 7593 | { |
| 7594 | _OuterIter& __outer = _M_get_outer(); |
| 7595 | if constexpr (_S_ref_is_glvalue) |
| 7596 | return __detail::__as_lvalue(*__outer); |
| 7597 | else |
| 7598 | return _M_parent->_M_inner._M_emplace_deref(__outer); |
| 7599 | } |
| 7600 | |
| 7601 | constexpr auto& |
| 7602 | _M_get_inner() |
| 7603 | { |
| 7604 | if constexpr (_S_ref_is_glvalue) |
| 7605 | return __detail::__as_lvalue(*_M_get_outer()); |
| 7606 | else |
| 7607 | return *_M_parent->_M_inner; |
| 7608 | } |
| 7609 | |
| 7610 | constexpr void |
| 7611 | _M_satisfy() |
| 7612 | { |
| 7613 | while (true) |
| 7614 | { |
| 7615 | if (_M_inner_it.index() == 0) |
| 7616 | { |
| 7617 | if (std::get<0>(_M_inner_it) != ranges::end(_M_parent->_M_pattern)) |
| 7618 | break; |
| 7619 | |
| 7620 | auto&& __inner = _M_update_inner(); |
| 7621 | _M_inner_it.template emplace<1>(ranges::begin(__inner)); |
| 7622 | } |
| 7623 | else |
| 7624 | { |
| 7625 | auto&& __inner = _M_get_inner(); |
| 7626 | if (std::get<1>(_M_inner_it) != ranges::end(__inner)) |
| 7627 | break; |
| 7628 | |
| 7629 | if (++_M_get_outer() == ranges::end(_M_parent->_M_base)) |
| 7630 | { |
| 7631 | if constexpr (_S_ref_is_glvalue) |
| 7632 | _M_inner_it.template emplace<0>(); |
| 7633 | break; |
| 7634 | } |
| 7635 | |
| 7636 | _M_inner_it.template emplace<0>(ranges::begin(_M_parent->_M_pattern)); |
| 7637 | } |
| 7638 | } |
| 7639 | } |
| 7640 | |
| 7641 | static auto |
| 7642 | _S_iter_concept() |
| 7643 | { |
| 7644 | if constexpr (_S_ref_is_glvalue |
| 7645 | && bidirectional_range<_Base> |
| 7646 | && __detail::__bidirectional_common<_InnerBase> |
| 7647 | && __detail::__bidirectional_common<_PatternBase>) |
| 7648 | return bidirectional_iterator_tag{}; |
| 7649 | else if constexpr (_S_ref_is_glvalue |
| 7650 | && forward_range<_Base> |
| 7651 | && forward_range<_InnerBase>) |
| 7652 | return forward_iterator_tag{}; |
| 7653 | else |
| 7654 | return input_iterator_tag{}; |
| 7655 | } |
| 7656 | |
| 7657 | friend join_with_view; |
| 7658 | |
| 7659 | public: |
| 7660 | using iterator_concept = decltype(_S_iter_concept()); |
| 7661 | // iterator_category defined in join_with_view::__iter_cat |
| 7662 | using value_type = common_type_t<iter_value_t<_InnerIter>, |
| 7663 | iter_value_t<_PatternIter>>; |
| 7664 | using difference_type = common_type_t<iter_difference_t<_OuterIter>, |
| 7665 | iter_difference_t<_InnerIter>, |
| 7666 | iter_difference_t<_PatternIter>>; |
| 7667 | |
| 7668 | _Iterator() = default; |
| 7669 | |
| 7670 | constexpr |
| 7671 | _Iterator(_Iterator<!_Const> __i) |
| 7672 | requires _Const |
| 7673 | && convertible_to<iterator_t<_Vp>, _OuterIter> |
| 7674 | && convertible_to<iterator_t<_InnerRange>, _InnerIter> |
| 7675 | && convertible_to<iterator_t<_Pattern>, _PatternIter> |
| 7676 | : _M_parent(__i._M_parent), |
| 7677 | _M_outer_it(std::move(__i._M_outer_it)) |
| 7678 | { |
| 7679 | if (__i._M_inner_it.index() == 0) |
| 7680 | _M_inner_it.template emplace<0>(std::get<0>(std::move(__i._M_inner_it))); |
| 7681 | else |
| 7682 | _M_inner_it.template emplace<1>(std::get<1>(std::move(__i._M_inner_it))); |
| 7683 | } |
| 7684 | |
| 7685 | constexpr common_reference_t<iter_reference_t<_InnerIter>, |
| 7686 | iter_reference_t<_PatternIter>> |
| 7687 | operator*() const |
| 7688 | { |
| 7689 | if (_M_inner_it.index() == 0) |
| 7690 | return *std::get<0>(_M_inner_it); |
| 7691 | else |
| 7692 | return *std::get<1>(_M_inner_it); |
| 7693 | } |
| 7694 | |
| 7695 | constexpr _Iterator& |
| 7696 | operator++() |
| 7697 | { |
| 7698 | if (_M_inner_it.index() == 0) |
| 7699 | ++std::get<0>(_M_inner_it); |
| 7700 | else |
| 7701 | ++std::get<1>(_M_inner_it); |
| 7702 | _M_satisfy(); |
| 7703 | return *this; |
| 7704 | } |
| 7705 | |
| 7706 | constexpr void |
| 7707 | operator++(int) |
| 7708 | { ++*this; } |
| 7709 | |
| 7710 | constexpr _Iterator |
| 7711 | operator++(int) |
| 7712 | requires _S_ref_is_glvalue |
| 7713 | && forward_iterator<_OuterIter> && forward_iterator<_InnerIter> |
| 7714 | { |
| 7715 | _Iterator __tmp = *this; |
| 7716 | ++*this; |
| 7717 | return __tmp; |
| 7718 | } |
| 7719 | |
| 7720 | constexpr _Iterator& |
| 7721 | operator--() |
| 7722 | requires _S_ref_is_glvalue |
| 7723 | && bidirectional_range<_Base> |
| 7724 | && __detail::__bidirectional_common<_InnerBase> |
| 7725 | && __detail::__bidirectional_common<_PatternBase> |
| 7726 | { |
| 7727 | if (_M_outer_it == ranges::end(_M_parent->_M_base)) |
| 7728 | { |
| 7729 | auto&& __inner = *--_M_outer_it; |
| 7730 | _M_inner_it.template emplace<1>(ranges::end(__inner)); |
| 7731 | } |
| 7732 | |
| 7733 | while (true) |
| 7734 | { |
| 7735 | if (_M_inner_it.index() == 0) |
| 7736 | { |
| 7737 | auto& __it = std::get<0>(_M_inner_it); |
| 7738 | if (__it == ranges::begin(_M_parent->_M_pattern)) |
| 7739 | { |
| 7740 | auto&& __inner = *--_M_outer_it; |
| 7741 | _M_inner_it.template emplace<1>(ranges::end(__inner)); |
| 7742 | } |
| 7743 | else |
| 7744 | break; |
| 7745 | } |
| 7746 | else |
| 7747 | { |
| 7748 | auto& __it = std::get<1>(_M_inner_it); |
| 7749 | auto&& __inner = *_M_outer_it; |
| 7750 | if (__it == ranges::begin(__inner)) |
| 7751 | _M_inner_it.template emplace<0>(ranges::end(_M_parent->_M_pattern)); |
| 7752 | else |
| 7753 | break; |
| 7754 | } |
| 7755 | } |
| 7756 | |
| 7757 | if (_M_inner_it.index() == 0) |
| 7758 | --std::get<0>(_M_inner_it); |
| 7759 | else |
| 7760 | --std::get<1>(_M_inner_it); |
| 7761 | return *this; |
| 7762 | } |
| 7763 | |
| 7764 | constexpr _Iterator |
| 7765 | operator--(int) |
| 7766 | requires _S_ref_is_glvalue && bidirectional_range<_Base> |
| 7767 | && __detail::__bidirectional_common<_InnerBase> |
| 7768 | && __detail::__bidirectional_common<_PatternBase> |
| 7769 | { |
| 7770 | _Iterator __tmp = *this; |
| 7771 | --*this; |
| 7772 | return __tmp; |
| 7773 | } |
| 7774 | |
| 7775 | friend constexpr bool |
| 7776 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 7777 | requires _S_ref_is_glvalue |
| 7778 | && forward_range<_Base> && equality_comparable<_InnerIter> |
| 7779 | { return __x._M_outer_it == __y._M_outer_it && __x._M_inner_it ==__y._M_inner_it; } |
| 7780 | |
| 7781 | friend constexpr common_reference_t<iter_rvalue_reference_t<_InnerIter>, |
| 7782 | iter_rvalue_reference_t<_PatternIter>> |
| 7783 | iter_move(const _Iterator& __x) |
| 7784 | { |
| 7785 | if (__x._M_inner_it.index() == 0) |
| 7786 | return ranges::iter_move(std::get<0>(__x._M_inner_it)); |
| 7787 | else |
| 7788 | return ranges::iter_move(std::get<1>(__x._M_inner_it)); |
| 7789 | } |
| 7790 | |
| 7791 | friend constexpr void |
| 7792 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 7793 | requires indirectly_swappable<_InnerIter, _PatternIter> |
| 7794 | { |
| 7795 | if (__x._M_inner_it.index() == 0) |
| 7796 | { |
| 7797 | if (__y._M_inner_it.index() == 0) |
| 7798 | ranges::iter_swap(std::get<0>(__x._M_inner_it), std::get<0>(__y._M_inner_it)); |
| 7799 | else |
| 7800 | ranges::iter_swap(std::get<0>(__x._M_inner_it), std::get<1>(__y._M_inner_it)); |
| 7801 | } |
| 7802 | else |
| 7803 | { |
| 7804 | if (__y._M_inner_it.index() == 0) |
| 7805 | ranges::iter_swap(std::get<1>(__x._M_inner_it), std::get<0>(__y._M_inner_it)); |
| 7806 | else |
| 7807 | ranges::iter_swap(std::get<1>(__x._M_inner_it), std::get<1>(__y._M_inner_it)); |
| 7808 | } |
| 7809 | } |
| 7810 | }; |
| 7811 | |
| 7812 | template<input_range _Vp, forward_range _Pattern> |
| 7813 | requires view<_Vp> && view<_Pattern> |
| 7814 | && input_range<range_reference_t<_Vp>> |
| 7815 | && __detail::__compatible_joinable_ranges<range_reference_t<_Vp>, _Pattern> |
| 7816 | template<bool _Const> |
| 7817 | class join_with_view<_Vp, _Pattern>::_Sentinel |
| 7818 | { |
| 7819 | using _Parent = __detail::__maybe_const_t<_Const, join_with_view>; |
| 7820 | using _Base = join_with_view::_Base<_Const>; |
| 7821 | |
| 7822 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 7823 | |
| 7824 | constexpr explicit |
| 7825 | _Sentinel(_Parent& __parent) |
| 7826 | : _M_end(ranges::end(__parent._M_base)) |
| 7827 | { } |
| 7828 | |
| 7829 | friend join_with_view; |
| 7830 | |
| 7831 | public: |
| 7832 | _Sentinel() = default; |
| 7833 | |
| 7834 | constexpr |
| 7835 | _Sentinel(_Sentinel<!_Const> __s) |
| 7836 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 7837 | : _M_end(std::move(__s._M_end)) |
| 7838 | { } |
| 7839 | |
| 7840 | template<bool _OtherConst> |
| 7841 | requires sentinel_for<sentinel_t<_Base>, |
| 7842 | iterator_t<__detail::__maybe_const_t<_OtherConst, _Vp>>> |
| 7843 | friend constexpr bool |
| 7844 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 7845 | { return __x._M_get_outer() == __y._M_end; } |
| 7846 | }; |
| 7847 | |
| 7848 | namespace views |
| 7849 | { |
| 7850 | namespace __detail |
| 7851 | { |
| 7852 | template<typename _Range, typename _Pattern> |
| 7853 | concept __can_join_with_view |
| 7854 | = requires { join_with_view(std::declval<_Range>(), std::declval<_Pattern>()); }; |
| 7855 | } // namespace __detail |
| 7856 | |
| 7857 | struct _JoinWith : __adaptor::_RangeAdaptor<_JoinWith> |
| 7858 | { |
| 7859 | template<viewable_range _Range, typename _Pattern> |
| 7860 | requires __detail::__can_join_with_view<_Range, _Pattern> |
| 7861 | constexpr auto |
| 7862 | operator() [[nodiscard]] (_Range&& __r, _Pattern&& __f) const |
| 7863 | { |
| 7864 | return join_with_view(std::forward<_Range>(__r), std::forward<_Pattern>(__f)); |
| 7865 | } |
| 7866 | |
| 7867 | using _RangeAdaptor<_JoinWith>::operator(); |
| 7868 | static constexpr int _S_arity = 2; |
| 7869 | template<typename _Pattern> |
| 7870 | static constexpr bool _S_has_simple_extra_args |
| 7871 | = _LazySplit::_S_has_simple_extra_args<_Pattern>; |
| 7872 | }; |
| 7873 | |
| 7874 | inline constexpr _JoinWith join_with; |
| 7875 | } // namespace views |
| 7876 | #endif // __cpp_lib_ranges_join_with |
| 7877 | |
| 7878 | #ifdef __cpp_lib_ranges_repeat // C++ >= 23 |
| 7879 | template<move_constructible _Tp, semiregular _Bound = unreachable_sentinel_t> |
| 7880 | requires is_object_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>> |
| 7881 | && (__detail::__is_integer_like<_Bound> || same_as<_Bound, unreachable_sentinel_t>) |
| 7882 | class repeat_view : public view_interface<repeat_view<_Tp, _Bound>> |
| 7883 | { |
| 7884 | [[no_unique_address]] __detail::__box<_Tp> _M_value; |
| 7885 | [[no_unique_address]] _Bound _M_bound = _Bound(); |
| 7886 | |
| 7887 | class _Iterator; |
| 7888 | |
| 7889 | template<typename _Range> |
| 7890 | friend constexpr auto |
| 7891 | views::__detail::__take_of_repeat_view(_Range&&, range_difference_t<_Range>); |
| 7892 | |
| 7893 | template<typename _Range> |
| 7894 | friend constexpr auto |
| 7895 | views::__detail::__drop_of_repeat_view(_Range&&, range_difference_t<_Range>); |
| 7896 | |
| 7897 | public: |
| 7898 | repeat_view() requires default_initializable<_Tp> = default; |
| 7899 | |
| 7900 | constexpr explicit |
| 7901 | repeat_view(const _Tp& __value, _Bound __bound = _Bound()) |
| 7902 | requires copy_constructible<_Tp> |
| 7903 | : _M_value(__value), _M_bound(__bound) |
| 7904 | { |
| 7905 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7906 | __glibcxx_assert(__bound >= 0); |
| 7907 | } |
| 7908 | |
| 7909 | constexpr explicit |
| 7910 | repeat_view(_Tp&& __value, _Bound __bound = _Bound()) |
| 7911 | : _M_value(std::move(__value)), _M_bound(__bound) |
| 7912 | { } |
| 7913 | |
| 7914 | template<typename... _Args, typename... _BoundArgs> |
| 7915 | requires constructible_from<_Tp, _Args...> |
| 7916 | && constructible_from<_Bound, _BoundArgs...> |
| 7917 | constexpr explicit |
| 7918 | repeat_view(piecewise_construct_t, |
| 7919 | tuple<_Args...> __args, |
| 7920 | tuple<_BoundArgs...> __bound_args = tuple<>{}) |
| 7921 | : _M_value(std::make_from_tuple<_Tp>(std::move(__args))), |
| 7922 | _M_bound(std::make_from_tuple<_Bound>(std::move(__bound_args))) |
| 7923 | { } |
| 7924 | |
| 7925 | constexpr _Iterator |
| 7926 | begin() const |
| 7927 | { return _Iterator(std::__addressof(*_M_value)); } |
| 7928 | |
| 7929 | constexpr _Iterator |
| 7930 | end() const requires (!same_as<_Bound, unreachable_sentinel_t>) |
| 7931 | { return _Iterator(std::__addressof(*_M_value), _M_bound); } |
| 7932 | |
| 7933 | constexpr unreachable_sentinel_t |
| 7934 | end() const noexcept |
| 7935 | { return unreachable_sentinel; } |
| 7936 | |
| 7937 | constexpr auto |
| 7938 | size() const requires (!same_as<_Bound, unreachable_sentinel_t>) |
| 7939 | { return __detail::__to_unsigned_like(_M_bound); } |
| 7940 | }; |
| 7941 | |
| 7942 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 7943 | // 4053. Unary call to std::views::repeat does not decay the argument |
| 7944 | template<typename _Tp, typename _Bound = unreachable_sentinel_t> |
| 7945 | repeat_view(_Tp, _Bound = _Bound()) -> repeat_view<_Tp, _Bound>; |
| 7946 | |
| 7947 | template<move_constructible _Tp, semiregular _Bound> |
| 7948 | requires is_object_v<_Tp> && same_as<_Tp, remove_cv_t<_Tp>> |
| 7949 | && (__detail::__is_integer_like<_Bound> || same_as<_Bound, unreachable_sentinel_t>) |
| 7950 | class repeat_view<_Tp, _Bound>::_Iterator |
| 7951 | { |
| 7952 | using __index_type |
| 7953 | = __conditional_t<same_as<_Bound, unreachable_sentinel_t>, ptrdiff_t, _Bound>; |
| 7954 | |
| 7955 | const _Tp* _M_value = nullptr; |
| 7956 | __index_type _M_current = __index_type(); |
| 7957 | |
| 7958 | constexpr explicit |
| 7959 | _Iterator(const _Tp* __value, __index_type __bound = __index_type()) |
| 7960 | : _M_value(__value), _M_current(__bound) |
| 7961 | { |
| 7962 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 7963 | __glibcxx_assert(__bound >= 0); |
| 7964 | } |
| 7965 | |
| 7966 | friend repeat_view; |
| 7967 | |
| 7968 | public: |
| 7969 | using iterator_concept = random_access_iterator_tag; |
| 7970 | using iterator_category = random_access_iterator_tag; |
| 7971 | using value_type = _Tp; |
| 7972 | using difference_type = __conditional_t<__detail::__is_signed_integer_like<__index_type>, |
| 7973 | __index_type, |
| 7974 | __detail::__iota_diff_t<__index_type>>; |
| 7975 | |
| 7976 | _Iterator() = default; |
| 7977 | |
| 7978 | constexpr const _Tp& |
| 7979 | operator*() const noexcept |
| 7980 | { return *_M_value; } |
| 7981 | |
| 7982 | constexpr _Iterator& |
| 7983 | operator++() |
| 7984 | { |
| 7985 | ++_M_current; |
| 7986 | return *this; |
| 7987 | } |
| 7988 | |
| 7989 | constexpr _Iterator |
| 7990 | operator++(int) |
| 7991 | { |
| 7992 | auto __tmp = *this; |
| 7993 | ++*this; |
| 7994 | return __tmp; |
| 7995 | } |
| 7996 | |
| 7997 | constexpr _Iterator& |
| 7998 | operator--() |
| 7999 | { |
| 8000 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 8001 | __glibcxx_assert(_M_current > 0); |
| 8002 | --_M_current; |
| 8003 | return *this; |
| 8004 | } |
| 8005 | |
| 8006 | constexpr _Iterator |
| 8007 | operator--(int) |
| 8008 | { |
| 8009 | auto __tmp = *this; |
| 8010 | --*this; |
| 8011 | return __tmp; |
| 8012 | } |
| 8013 | |
| 8014 | constexpr _Iterator& |
| 8015 | operator+=(difference_type __n) |
| 8016 | { |
| 8017 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 8018 | __glibcxx_assert(_M_current + __n >= 0); |
| 8019 | _M_current += __n; |
| 8020 | return *this; |
| 8021 | } |
| 8022 | |
| 8023 | constexpr _Iterator& |
| 8024 | operator-=(difference_type __n) |
| 8025 | { |
| 8026 | if constexpr (!same_as<_Bound, unreachable_sentinel_t>) |
| 8027 | __glibcxx_assert(_M_current - __n >= 0); |
| 8028 | _M_current -= __n; |
| 8029 | return *this; |
| 8030 | } |
| 8031 | |
| 8032 | constexpr const _Tp& |
| 8033 | operator[](difference_type __n) const noexcept |
| 8034 | { return *(*this + __n); } |
| 8035 | |
| 8036 | friend constexpr bool |
| 8037 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 8038 | { return __x._M_current == __y._M_current; } |
| 8039 | |
| 8040 | friend constexpr auto |
| 8041 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 8042 | { return __x._M_current <=> __y._M_current; } |
| 8043 | |
| 8044 | friend constexpr _Iterator |
| 8045 | operator+(_Iterator __i, difference_type __n) |
| 8046 | { |
| 8047 | __i += __n; |
| 8048 | return __i; |
| 8049 | } |
| 8050 | |
| 8051 | friend constexpr _Iterator |
| 8052 | operator+(difference_type __n, _Iterator __i) |
| 8053 | { return __i + __n; } |
| 8054 | |
| 8055 | friend constexpr _Iterator |
| 8056 | operator-(_Iterator __i, difference_type __n) |
| 8057 | { |
| 8058 | __i -= __n; |
| 8059 | return __i; |
| 8060 | } |
| 8061 | |
| 8062 | friend constexpr difference_type |
| 8063 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 8064 | { |
| 8065 | return (static_cast<difference_type>(__x._M_current) |
| 8066 | - static_cast<difference_type>(__y._M_current)); |
| 8067 | } |
| 8068 | }; |
| 8069 | |
| 8070 | namespace views |
| 8071 | { |
| 8072 | namespace __detail |
| 8073 | { |
| 8074 | template<typename _Tp, typename _Bound> |
| 8075 | inline constexpr bool __is_repeat_view<repeat_view<_Tp, _Bound>> = true; |
| 8076 | |
| 8077 | template<typename _Tp> |
| 8078 | concept __can_repeat_view |
| 8079 | = requires { repeat_view(std::declval<_Tp>()); }; |
| 8080 | |
| 8081 | template<typename _Tp, typename _Bound> |
| 8082 | concept __can_bounded_repeat_view |
| 8083 | = requires { repeat_view(std::declval<_Tp>(), std::declval<_Bound>()); }; |
| 8084 | } |
| 8085 | |
| 8086 | struct _Repeat |
| 8087 | { |
| 8088 | template<typename _Tp> |
| 8089 | requires __detail::__can_repeat_view<_Tp> |
| 8090 | constexpr auto |
| 8091 | operator() [[nodiscard]] (_Tp&& __value) const |
| 8092 | { |
| 8093 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 8094 | // 4054. Repeating a repeat_view should repeat the view |
| 8095 | return repeat_view<decay_t<_Tp>>(std::forward<_Tp>(__value)); |
| 8096 | } |
| 8097 | |
| 8098 | template<typename _Tp, typename _Bound> |
| 8099 | requires __detail::__can_bounded_repeat_view<_Tp, _Bound> |
| 8100 | constexpr auto |
| 8101 | operator() [[nodiscard]] (_Tp&& __value, _Bound __bound) const |
| 8102 | { return repeat_view(std::forward<_Tp>(__value), __bound); } |
| 8103 | }; |
| 8104 | |
| 8105 | inline constexpr _Repeat repeat; |
| 8106 | |
| 8107 | namespace __detail |
| 8108 | { |
| 8109 | template<typename _Range> |
| 8110 | constexpr auto |
| 8111 | __take_of_repeat_view(_Range&& __r, range_difference_t<_Range> __n) |
| 8112 | { |
| 8113 | using _Tp = remove_cvref_t<_Range>; |
| 8114 | static_assert(__is_repeat_view<_Tp>); |
| 8115 | if constexpr (sized_range<_Tp>) |
| 8116 | return views::repeat(*std::forward<_Range>(__r)._M_value, |
| 8117 | std::min(ranges::distance(__r), __n)); |
| 8118 | else |
| 8119 | return views::repeat(*std::forward<_Range>(__r)._M_value, __n); |
| 8120 | } |
| 8121 | |
| 8122 | template<typename _Range> |
| 8123 | constexpr auto |
| 8124 | __drop_of_repeat_view(_Range&& __r, range_difference_t<_Range> __n) |
| 8125 | { |
| 8126 | using _Tp = remove_cvref_t<_Range>; |
| 8127 | static_assert(__is_repeat_view<_Tp>); |
| 8128 | if constexpr (sized_range<_Tp>) |
| 8129 | { |
| 8130 | auto __sz = ranges::distance(__r); |
| 8131 | return views::repeat(*std::forward<_Range>(__r)._M_value, |
| 8132 | __sz - std::min(__sz, __n)); |
| 8133 | } |
| 8134 | else |
| 8135 | return __r; |
| 8136 | } |
| 8137 | } |
| 8138 | } |
| 8139 | #endif // __cpp_lib_ranges_repeat |
| 8140 | |
| 8141 | #ifdef __cpp_lib_ranges_stride // C++ >= 23 |
| 8142 | template<input_range _Vp> |
| 8143 | requires view<_Vp> |
| 8144 | class stride_view : public view_interface<stride_view<_Vp>> |
| 8145 | { |
| 8146 | _Vp _M_base; |
| 8147 | range_difference_t<_Vp> _M_stride; |
| 8148 | |
| 8149 | template<bool _Const> using _Base = __detail::__maybe_const_t<_Const, _Vp>; |
| 8150 | |
| 8151 | template<bool _Const> |
| 8152 | struct __iter_cat |
| 8153 | { }; |
| 8154 | |
| 8155 | template<bool _Const> |
| 8156 | requires forward_range<_Base<_Const>> |
| 8157 | struct __iter_cat<_Const> |
| 8158 | { |
| 8159 | private: |
| 8160 | static auto |
| 8161 | _S_iter_cat() |
| 8162 | { |
| 8163 | using _Cat = typename iterator_traits<iterator_t<_Base<_Const>>>::iterator_category; |
| 8164 | if constexpr (derived_from<_Cat, random_access_iterator_tag>) |
| 8165 | return random_access_iterator_tag{}; |
| 8166 | else |
| 8167 | return _Cat{}; |
| 8168 | } |
| 8169 | public: |
| 8170 | using iterator_category = decltype(_S_iter_cat()); |
| 8171 | }; |
| 8172 | |
| 8173 | template<bool> class _Iterator; |
| 8174 | |
| 8175 | public: |
| 8176 | constexpr explicit |
| 8177 | stride_view(_Vp __base, range_difference_t<_Vp> __stride) |
| 8178 | : _M_base(std::move(__base)), _M_stride(__stride) |
| 8179 | { __glibcxx_assert(__stride > 0); } |
| 8180 | |
| 8181 | constexpr _Vp |
| 8182 | base() const& requires copy_constructible<_Vp> |
| 8183 | { return _M_base; } |
| 8184 | |
| 8185 | constexpr _Vp |
| 8186 | base() && |
| 8187 | { return std::move(_M_base); } |
| 8188 | |
| 8189 | constexpr range_difference_t<_Vp> |
| 8190 | stride() const noexcept |
| 8191 | { return _M_stride; } |
| 8192 | |
| 8193 | constexpr auto |
| 8194 | begin() requires (!__detail::__simple_view<_Vp>) |
| 8195 | { return _Iterator<false>(this, ranges::begin(_M_base)); } |
| 8196 | |
| 8197 | constexpr auto |
| 8198 | begin() const requires range<const _Vp> |
| 8199 | { return _Iterator<true>(this, ranges::begin(_M_base)); } |
| 8200 | |
| 8201 | constexpr auto |
| 8202 | end() requires (!__detail::__simple_view<_Vp>) |
| 8203 | { |
| 8204 | if constexpr (common_range<_Vp> && sized_range<_Vp> && forward_range<_Vp>) |
| 8205 | { |
| 8206 | auto __missing = (_M_stride - ranges::distance(_M_base) % _M_stride) % _M_stride; |
| 8207 | return _Iterator<false>(this, ranges::end(_M_base), __missing); |
| 8208 | } |
| 8209 | else if constexpr (common_range<_Vp> && !bidirectional_range<_Vp>) |
| 8210 | return _Iterator<false>(this, ranges::end(_M_base)); |
| 8211 | else |
| 8212 | return default_sentinel; |
| 8213 | } |
| 8214 | |
| 8215 | constexpr auto |
| 8216 | end() const requires range<const _Vp> |
| 8217 | { |
| 8218 | if constexpr (common_range<const _Vp> && sized_range<const _Vp> |
| 8219 | && forward_range<const _Vp>) |
| 8220 | { |
| 8221 | auto __missing = (_M_stride - ranges::distance(_M_base) % _M_stride) % _M_stride; |
| 8222 | return _Iterator<true>(this, ranges::end(_M_base), __missing); |
| 8223 | } |
| 8224 | else if constexpr (common_range<const _Vp> && !bidirectional_range<const _Vp>) |
| 8225 | return _Iterator<true>(this, ranges::end(_M_base)); |
| 8226 | else |
| 8227 | return default_sentinel; |
| 8228 | } |
| 8229 | |
| 8230 | constexpr auto |
| 8231 | size() requires sized_range<_Vp> |
| 8232 | { |
| 8233 | return __detail::__to_unsigned_like |
| 8234 | (__detail::__div_ceil(ranges::distance(_M_base), _M_stride)); |
| 8235 | } |
| 8236 | |
| 8237 | constexpr auto |
| 8238 | size() const requires sized_range<const _Vp> |
| 8239 | { |
| 8240 | return __detail::__to_unsigned_like |
| 8241 | (__detail::__div_ceil(ranges::distance(_M_base), _M_stride)); |
| 8242 | } |
| 8243 | }; |
| 8244 | |
| 8245 | template<typename _Range> |
| 8246 | stride_view(_Range&&, range_difference_t<_Range>) -> stride_view<views::all_t<_Range>>; |
| 8247 | |
| 8248 | template<typename _Vp> |
| 8249 | inline constexpr bool enable_borrowed_range<stride_view<_Vp>> |
| 8250 | = enable_borrowed_range<_Vp>; |
| 8251 | |
| 8252 | template<input_range _Vp> |
| 8253 | requires view<_Vp> |
| 8254 | template<bool _Const> |
| 8255 | class stride_view<_Vp>::_Iterator : public __iter_cat<_Const> |
| 8256 | { |
| 8257 | using _Parent = __detail::__maybe_const_t<_Const, stride_view>; |
| 8258 | using _Base = stride_view::_Base<_Const>; |
| 8259 | |
| 8260 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 8261 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 8262 | range_difference_t<_Base> _M_stride = 0; |
| 8263 | range_difference_t<_Base> _M_missing = 0; |
| 8264 | |
| 8265 | constexpr |
| 8266 | _Iterator(_Parent* __parent, iterator_t<_Base> __current, |
| 8267 | range_difference_t<_Base> __missing = 0) |
| 8268 | : _M_current(std::move(__current)), _M_end(ranges::end(__parent->_M_base)), |
| 8269 | _M_stride(__parent->_M_stride), _M_missing(__missing) |
| 8270 | { } |
| 8271 | |
| 8272 | static auto |
| 8273 | _S_iter_concept() |
| 8274 | { |
| 8275 | if constexpr (random_access_range<_Base>) |
| 8276 | return random_access_iterator_tag{}; |
| 8277 | else if constexpr (bidirectional_range<_Base>) |
| 8278 | return bidirectional_iterator_tag{}; |
| 8279 | else if constexpr (forward_range<_Base>) |
| 8280 | return forward_iterator_tag{}; |
| 8281 | else |
| 8282 | return input_iterator_tag{}; |
| 8283 | } |
| 8284 | |
| 8285 | friend stride_view; |
| 8286 | |
| 8287 | public: |
| 8288 | using difference_type = range_difference_t<_Base>; |
| 8289 | using value_type = range_value_t<_Base>; |
| 8290 | using iterator_concept = decltype(_S_iter_concept()); |
| 8291 | // iterator_category defined in stride_view::__iter_cat |
| 8292 | |
| 8293 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 8294 | |
| 8295 | constexpr |
| 8296 | _Iterator(_Iterator<!_Const> __other) |
| 8297 | requires _Const |
| 8298 | && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 8299 | && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 8300 | : _M_current(std::move(__other._M_current)), _M_end(std::move(__other._M_end)), |
| 8301 | _M_stride(__other._M_stride), _M_missing(__other._M_missing) |
| 8302 | { } |
| 8303 | |
| 8304 | constexpr iterator_t<_Base> |
| 8305 | base() && |
| 8306 | { return std::move(_M_current); } |
| 8307 | |
| 8308 | constexpr const iterator_t<_Base>& |
| 8309 | base() const & noexcept |
| 8310 | { return _M_current; } |
| 8311 | |
| 8312 | constexpr decltype(auto) |
| 8313 | operator*() const |
| 8314 | { return *_M_current; } |
| 8315 | |
| 8316 | constexpr _Iterator& |
| 8317 | operator++() |
| 8318 | { |
| 8319 | __glibcxx_assert(_M_current != _M_end); |
| 8320 | _M_missing = ranges::advance(_M_current, _M_stride, _M_end); |
| 8321 | return *this; |
| 8322 | } |
| 8323 | |
| 8324 | constexpr void |
| 8325 | operator++(int) |
| 8326 | { ++*this; } |
| 8327 | |
| 8328 | constexpr _Iterator |
| 8329 | operator++(int) requires forward_range<_Base> |
| 8330 | { |
| 8331 | auto __tmp = *this; |
| 8332 | ++*this; |
| 8333 | return __tmp; |
| 8334 | } |
| 8335 | |
| 8336 | constexpr _Iterator& |
| 8337 | operator--() requires bidirectional_range<_Base> |
| 8338 | { |
| 8339 | ranges::advance(_M_current, _M_missing - _M_stride); |
| 8340 | _M_missing = 0; |
| 8341 | return *this; |
| 8342 | } |
| 8343 | |
| 8344 | constexpr _Iterator |
| 8345 | operator--(int) requires bidirectional_range<_Base> |
| 8346 | { |
| 8347 | auto __tmp = *this; |
| 8348 | --*this; |
| 8349 | return __tmp; |
| 8350 | } |
| 8351 | |
| 8352 | constexpr _Iterator& |
| 8353 | operator+=(difference_type __n) requires random_access_range<_Base> |
| 8354 | { |
| 8355 | if (__n > 0) |
| 8356 | { |
| 8357 | __glibcxx_assert(ranges::distance(_M_current, _M_end) > _M_stride * (__n - 1)); |
| 8358 | _M_missing = ranges::advance(_M_current, _M_stride * __n, _M_end); |
| 8359 | } |
| 8360 | else if (__n < 0) |
| 8361 | { |
| 8362 | ranges::advance(_M_current, _M_stride * __n + _M_missing); |
| 8363 | _M_missing = 0; |
| 8364 | } |
| 8365 | return *this; |
| 8366 | } |
| 8367 | |
| 8368 | constexpr _Iterator& |
| 8369 | operator-=(difference_type __n) requires random_access_range<_Base> |
| 8370 | { return *this += -__n; } |
| 8371 | |
| 8372 | constexpr decltype(auto) operator[](difference_type __n) const |
| 8373 | requires random_access_range<_Base> |
| 8374 | { return *(*this + __n); } |
| 8375 | |
| 8376 | friend constexpr bool |
| 8377 | operator==(const _Iterator& __x, default_sentinel_t) |
| 8378 | { return __x._M_current == __x._M_end; } |
| 8379 | |
| 8380 | friend constexpr bool |
| 8381 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 8382 | requires equality_comparable<iterator_t<_Base>> |
| 8383 | { return __x._M_current == __y._M_current; } |
| 8384 | |
| 8385 | friend constexpr bool |
| 8386 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 8387 | requires random_access_range<_Base> |
| 8388 | { return __x._M_current < __y._M_current; } |
| 8389 | |
| 8390 | friend constexpr bool |
| 8391 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 8392 | requires random_access_range<_Base> |
| 8393 | { return __y._M_current < __x._M_current; } |
| 8394 | |
| 8395 | friend constexpr bool |
| 8396 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 8397 | requires random_access_range<_Base> |
| 8398 | { return !(__y._M_current < __x._M_current); } |
| 8399 | |
| 8400 | friend constexpr bool |
| 8401 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 8402 | requires random_access_range<_Base> |
| 8403 | { return !(__x._M_current < __y._M_current); } |
| 8404 | |
| 8405 | friend constexpr auto |
| 8406 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 8407 | requires random_access_range<_Base> && three_way_comparable<iterator_t<_Base>> |
| 8408 | { return __x._M_current <=> __y._M_current; } |
| 8409 | |
| 8410 | friend constexpr _Iterator |
| 8411 | operator+(const _Iterator& __i, difference_type __n) |
| 8412 | requires random_access_range<_Base> |
| 8413 | { |
| 8414 | auto __r = __i; |
| 8415 | __r += __n; |
| 8416 | return __r; |
| 8417 | } |
| 8418 | |
| 8419 | friend constexpr _Iterator |
| 8420 | operator+(difference_type __n, const _Iterator& __i) |
| 8421 | requires random_access_range<_Base> |
| 8422 | { return __i + __n; } |
| 8423 | |
| 8424 | friend constexpr _Iterator |
| 8425 | operator-(const _Iterator& __i, difference_type __n) |
| 8426 | requires random_access_range<_Base> |
| 8427 | { |
| 8428 | auto __r = __i; |
| 8429 | __r -= __n; |
| 8430 | return __r; |
| 8431 | } |
| 8432 | |
| 8433 | friend constexpr difference_type |
| 8434 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 8435 | requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> |
| 8436 | { |
| 8437 | auto __n = __x._M_current - __y._M_current; |
| 8438 | if constexpr (forward_range<_Base>) |
| 8439 | return (__n + __x._M_missing - __y._M_missing) / __x._M_stride; |
| 8440 | else if (__n < 0) |
| 8441 | return -__detail::__div_ceil(-__n, __x._M_stride); |
| 8442 | else |
| 8443 | return __detail::__div_ceil(__n, __x._M_stride); |
| 8444 | } |
| 8445 | |
| 8446 | friend constexpr difference_type |
| 8447 | operator-(default_sentinel_t, const _Iterator& __x) |
| 8448 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 8449 | { return __detail::__div_ceil(__x._M_end - __x._M_current, __x._M_stride); } |
| 8450 | |
| 8451 | friend constexpr difference_type |
| 8452 | operator-(const _Iterator& __x, default_sentinel_t __y) |
| 8453 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 8454 | { return -(__y - __x); } |
| 8455 | |
| 8456 | friend constexpr range_rvalue_reference_t<_Base> |
| 8457 | iter_move(const _Iterator& __i) |
| 8458 | noexcept(noexcept(ranges::iter_move(__i._M_current))) |
| 8459 | { return ranges::iter_move(__i._M_current); } |
| 8460 | |
| 8461 | friend constexpr void |
| 8462 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 8463 | noexcept(noexcept(ranges::iter_swap(__x._M_current, __y._M_current))) |
| 8464 | requires indirectly_swappable<iterator_t<_Base>> |
| 8465 | { ranges::iter_swap(__x._M_current, __y._M_current); } |
| 8466 | }; |
| 8467 | |
| 8468 | namespace views |
| 8469 | { |
| 8470 | namespace __detail |
| 8471 | { |
| 8472 | template<typename _Range, typename _Dp> |
| 8473 | concept __can_stride_view |
| 8474 | = requires { stride_view(std::declval<_Range>(), std::declval<_Dp>()); }; |
| 8475 | } |
| 8476 | |
| 8477 | struct _Stride : __adaptor::_RangeAdaptor<_Stride> |
| 8478 | { |
| 8479 | template<viewable_range _Range, typename _Dp = range_difference_t<_Range>> |
| 8480 | requires __detail::__can_stride_view<_Range, _Dp> |
| 8481 | constexpr auto |
| 8482 | operator() [[nodiscard]] (_Range&& __r, type_identity_t<_Dp> __n) const |
| 8483 | { return stride_view(std::forward<_Range>(__r), __n); } |
| 8484 | |
| 8485 | using __adaptor::_RangeAdaptor<_Stride>::operator(); |
| 8486 | static constexpr int _S_arity = 2; |
| 8487 | static constexpr bool _S_has_simple_extra_args = true; |
| 8488 | }; |
| 8489 | |
| 8490 | inline constexpr _Stride stride; |
| 8491 | } |
| 8492 | #endif // __cpp_lib_ranges_stride |
| 8493 | |
| 8494 | #ifdef __cpp_lib_ranges_cartesian_product // C++ >= 23 |
| 8495 | namespace __detail |
| 8496 | { |
| 8497 | template<bool _Const, typename _First, typename... _Vs> |
| 8498 | concept __cartesian_product_is_random_access |
| 8499 | = (random_access_range<__maybe_const_t<_Const, _First>> |
| 8500 | && ... |
| 8501 | && (random_access_range<__maybe_const_t<_Const, _Vs>> |
| 8502 | && sized_range<__maybe_const_t<_Const, _Vs>>)); |
| 8503 | |
| 8504 | template<typename _Range> |
| 8505 | concept __cartesian_product_common_arg |
| 8506 | = common_range<_Range> || (sized_range<_Range> && random_access_range<_Range>); |
| 8507 | |
| 8508 | template<bool _Const, typename _First, typename... _Vs> |
| 8509 | concept __cartesian_product_is_bidirectional |
| 8510 | = (bidirectional_range<__maybe_const_t<_Const, _First>> |
| 8511 | && ... |
| 8512 | && (bidirectional_range<__maybe_const_t<_Const, _Vs>> |
| 8513 | && __cartesian_product_common_arg<__maybe_const_t<_Const, _Vs>>)); |
| 8514 | |
| 8515 | template<typename _First, typename... _Vs> |
| 8516 | concept __cartesian_product_is_common = __cartesian_product_common_arg<_First>; |
| 8517 | |
| 8518 | template<typename... _Vs> |
| 8519 | concept __cartesian_product_is_sized = (sized_range<_Vs> && ...); |
| 8520 | |
| 8521 | template<bool _Const, template<typename> class _FirstSent, |
| 8522 | typename _First, typename... _Vs> |
| 8523 | concept __cartesian_is_sized_sentinel |
| 8524 | = (sized_sentinel_for<_FirstSent<__maybe_const_t<_Const, _First>>, |
| 8525 | iterator_t<__maybe_const_t<_Const, _First>>> |
| 8526 | && ... |
| 8527 | && (sized_range<__maybe_const_t<_Const, _Vs>> |
| 8528 | && sized_sentinel_for<iterator_t<__maybe_const_t<_Const, _Vs>>, |
| 8529 | iterator_t<__maybe_const_t<_Const, _Vs>>>)); |
| 8530 | |
| 8531 | template<__cartesian_product_common_arg _Range> |
| 8532 | constexpr auto |
| 8533 | __cartesian_common_arg_end(_Range& __r) |
| 8534 | { |
| 8535 | if constexpr (common_range<_Range>) |
| 8536 | return ranges::end(__r); |
| 8537 | else |
| 8538 | return ranges::begin(__r) + ranges::distance(__r); |
| 8539 | } |
| 8540 | } // namespace __detail |
| 8541 | |
| 8542 | template<input_range _First, forward_range... _Vs> |
| 8543 | requires (view<_First> && ... && view<_Vs>) |
| 8544 | class cartesian_product_view : public view_interface<cartesian_product_view<_First, _Vs...>> |
| 8545 | { |
| 8546 | tuple<_First, _Vs...> _M_bases; |
| 8547 | |
| 8548 | template<bool> class _Iterator; |
| 8549 | |
| 8550 | static auto |
| 8551 | _S_difference_type() |
| 8552 | { |
| 8553 | // TODO: Implement the recommended practice of using the smallest |
| 8554 | // sufficiently wide type according to the maximum sizes of the |
| 8555 | // underlying ranges? |
| 8556 | return common_type_t<ptrdiff_t, |
| 8557 | range_difference_t<_First>, |
| 8558 | range_difference_t<_Vs>...>{}; |
| 8559 | } |
| 8560 | |
| 8561 | public: |
| 8562 | cartesian_product_view() = default; |
| 8563 | |
| 8564 | constexpr explicit |
| 8565 | cartesian_product_view(_First __first, _Vs... __rest) |
| 8566 | : _M_bases(std::move(__first), std::move(__rest)...) |
| 8567 | { } |
| 8568 | |
| 8569 | constexpr _Iterator<false> |
| 8570 | begin() requires (!__detail::__simple_view<_First> || ... || !__detail::__simple_view<_Vs>) |
| 8571 | { return _Iterator<false>(*this, __detail::__tuple_transform(ranges::begin, _M_bases)); } |
| 8572 | |
| 8573 | constexpr _Iterator<true> |
| 8574 | begin() const requires (range<const _First> && ... && range<const _Vs>) |
| 8575 | { return _Iterator<true>(*this, __detail::__tuple_transform(ranges::begin, _M_bases)); } |
| 8576 | |
| 8577 | constexpr _Iterator<false> |
| 8578 | end() requires ((!__detail::__simple_view<_First> || ... || !__detail::__simple_view<_Vs>) |
| 8579 | && __detail::__cartesian_product_is_common<_First, _Vs...>) |
| 8580 | { |
| 8581 | auto __its = [this]<size_t... _Is>(index_sequence<_Is...>) { |
| 8582 | using _Ret = tuple<iterator_t<_First>, iterator_t<_Vs>...>; |
| 8583 | bool __empty_tail = (ranges::empty(std::get<1 + _Is>(_M_bases)) || ...); |
| 8584 | auto& __first = std::get<0>(_M_bases); |
| 8585 | return _Ret{(__empty_tail |
| 8586 | ? ranges::begin(__first) |
| 8587 | : __detail::__cartesian_common_arg_end(__first)), |
| 8588 | ranges::begin(std::get<1 + _Is>(_M_bases))...}; |
| 8589 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 8590 | |
| 8591 | return _Iterator<false>{*this, std::move(__its)}; |
| 8592 | } |
| 8593 | |
| 8594 | constexpr _Iterator<true> |
| 8595 | end() const requires __detail::__cartesian_product_is_common<const _First, const _Vs...> |
| 8596 | { |
| 8597 | auto __its = [this]<size_t... _Is>(index_sequence<_Is...>) { |
| 8598 | using _Ret = tuple<iterator_t<const _First>, iterator_t<const _Vs>...>; |
| 8599 | bool __empty_tail = (ranges::empty(std::get<1 + _Is>(_M_bases)) || ...); |
| 8600 | auto& __first = std::get<0>(_M_bases); |
| 8601 | return _Ret{(__empty_tail |
| 8602 | ? ranges::begin(__first) |
| 8603 | : __detail::__cartesian_common_arg_end(__first)), |
| 8604 | ranges::begin(std::get<1 + _Is>(_M_bases))...}; |
| 8605 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 8606 | |
| 8607 | return _Iterator<true>{*this, std::move(__its)}; |
| 8608 | } |
| 8609 | |
| 8610 | constexpr default_sentinel_t |
| 8611 | end() const noexcept |
| 8612 | { return default_sentinel; } |
| 8613 | |
| 8614 | constexpr auto |
| 8615 | size() requires __detail::__cartesian_product_is_sized<_First, _Vs...> |
| 8616 | { |
| 8617 | using _ST = __detail::__make_unsigned_like_t<decltype(_S_difference_type())>; |
| 8618 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8619 | auto __size = static_cast<_ST>(1); |
| 8620 | #ifdef _GLIBCXX_ASSERTIONS |
| 8621 | if constexpr (integral<_ST>) |
| 8622 | { |
| 8623 | bool __overflow |
| 8624 | = (__builtin_mul_overflow(__size, |
| 8625 | static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))), |
| 8626 | &__size) |
| 8627 | || ...); |
| 8628 | __glibcxx_assert(!__overflow); |
| 8629 | } |
| 8630 | else |
| 8631 | #endif |
| 8632 | __size = (static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))) * ...); |
| 8633 | return __size; |
| 8634 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8635 | } |
| 8636 | |
| 8637 | constexpr auto |
| 8638 | size() const requires __detail::__cartesian_product_is_sized<const _First, const _Vs...> |
| 8639 | { |
| 8640 | using _ST = __detail::__make_unsigned_like_t<decltype(_S_difference_type())>; |
| 8641 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8642 | auto __size = static_cast<_ST>(1); |
| 8643 | #ifdef _GLIBCXX_ASSERTIONS |
| 8644 | if constexpr (integral<_ST>) |
| 8645 | { |
| 8646 | bool __overflow |
| 8647 | = (__builtin_mul_overflow(__size, |
| 8648 | static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))), |
| 8649 | &__size) |
| 8650 | || ...); |
| 8651 | __glibcxx_assert(!__overflow); |
| 8652 | } |
| 8653 | else |
| 8654 | #endif |
| 8655 | __size = (static_cast<_ST>(ranges::size(std::get<_Is>(_M_bases))) * ...); |
| 8656 | return __size; |
| 8657 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8658 | } |
| 8659 | }; |
| 8660 | |
| 8661 | template<typename... _Vs> |
| 8662 | cartesian_product_view(_Vs&&...) -> cartesian_product_view<views::all_t<_Vs>...>; |
| 8663 | |
| 8664 | template<input_range _First, forward_range... _Vs> |
| 8665 | requires (view<_First> && ... && view<_Vs>) |
| 8666 | template<bool _Const> |
| 8667 | class cartesian_product_view<_First, _Vs...>::_Iterator |
| 8668 | { |
| 8669 | using _Parent = __maybe_const_t<_Const, cartesian_product_view>; |
| 8670 | _Parent* _M_parent = nullptr; |
| 8671 | tuple<iterator_t<__maybe_const_t<_Const, _First>>, |
| 8672 | iterator_t<__maybe_const_t<_Const, _Vs>>...> _M_current; |
| 8673 | |
| 8674 | constexpr |
| 8675 | _Iterator(_Parent& __parent, decltype(_M_current) __current) |
| 8676 | : _M_parent(std::__addressof(__parent)), |
| 8677 | _M_current(std::move(__current)) |
| 8678 | { } |
| 8679 | |
| 8680 | static auto |
| 8681 | _S_iter_concept() |
| 8682 | { |
| 8683 | if constexpr (__detail::__cartesian_product_is_random_access<_Const, _First, _Vs...>) |
| 8684 | return random_access_iterator_tag{}; |
| 8685 | else if constexpr (__detail::__cartesian_product_is_bidirectional<_Const, _First, _Vs...>) |
| 8686 | return bidirectional_iterator_tag{}; |
| 8687 | else if constexpr (forward_range<__maybe_const_t<_Const, _First>>) |
| 8688 | return forward_iterator_tag{}; |
| 8689 | else |
| 8690 | return input_iterator_tag{}; |
| 8691 | } |
| 8692 | |
| 8693 | friend cartesian_product_view; |
| 8694 | |
| 8695 | public: |
| 8696 | using iterator_category = input_iterator_tag; |
| 8697 | using iterator_concept = decltype(_S_iter_concept()); |
| 8698 | using value_type |
| 8699 | = tuple<range_value_t<__maybe_const_t<_Const, _First>>, |
| 8700 | range_value_t<__maybe_const_t<_Const, _Vs>>...>; |
| 8701 | using reference |
| 8702 | = tuple<range_reference_t<__maybe_const_t<_Const, _First>>, |
| 8703 | range_reference_t<__maybe_const_t<_Const, _Vs>>...>; |
| 8704 | using difference_type = decltype(cartesian_product_view::_S_difference_type()); |
| 8705 | |
| 8706 | _Iterator() = default; |
| 8707 | |
| 8708 | constexpr |
| 8709 | _Iterator(_Iterator<!_Const> __i) |
| 8710 | requires _Const |
| 8711 | && (convertible_to<iterator_t<_First>, iterator_t<const _First>> |
| 8712 | && ... && convertible_to<iterator_t<_Vs>, iterator_t<const _Vs>>) |
| 8713 | : _M_parent(std::__addressof(__i._M_parent)), |
| 8714 | _M_current(std::move(__i._M_current)) |
| 8715 | { } |
| 8716 | |
| 8717 | constexpr auto |
| 8718 | operator*() const |
| 8719 | { |
| 8720 | auto __f = [](auto& __i) -> decltype(auto) { |
| 8721 | return *__i; |
| 8722 | }; |
| 8723 | return __detail::__tuple_transform(__f, _M_current); |
| 8724 | } |
| 8725 | |
| 8726 | constexpr _Iterator& |
| 8727 | operator++() |
| 8728 | { |
| 8729 | _M_next(); |
| 8730 | return *this; |
| 8731 | } |
| 8732 | |
| 8733 | constexpr void |
| 8734 | operator++(int) |
| 8735 | { ++*this; } |
| 8736 | |
| 8737 | constexpr _Iterator |
| 8738 | operator++(int) requires forward_range<__maybe_const_t<_Const, _First>> |
| 8739 | { |
| 8740 | auto __tmp = *this; |
| 8741 | ++*this; |
| 8742 | return __tmp; |
| 8743 | } |
| 8744 | |
| 8745 | constexpr _Iterator& |
| 8746 | operator--() |
| 8747 | requires __detail::__cartesian_product_is_bidirectional<_Const, _First, _Vs...> |
| 8748 | { |
| 8749 | _M_prev(); |
| 8750 | return *this; |
| 8751 | } |
| 8752 | |
| 8753 | constexpr _Iterator |
| 8754 | operator--(int) |
| 8755 | requires __detail::__cartesian_product_is_bidirectional<_Const, _First, _Vs...> |
| 8756 | { |
| 8757 | auto __tmp = *this; |
| 8758 | --*this; |
| 8759 | return __tmp; |
| 8760 | } |
| 8761 | |
| 8762 | constexpr _Iterator& |
| 8763 | operator+=(difference_type __x) |
| 8764 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8765 | { |
| 8766 | _M_advance(__x); |
| 8767 | return *this; |
| 8768 | } |
| 8769 | |
| 8770 | constexpr _Iterator& |
| 8771 | operator-=(difference_type __x) |
| 8772 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8773 | { return *this += -__x; } |
| 8774 | |
| 8775 | constexpr reference |
| 8776 | operator[](difference_type __n) const |
| 8777 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8778 | { return *((*this) + __n); } |
| 8779 | |
| 8780 | friend constexpr bool |
| 8781 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 8782 | requires equality_comparable<iterator_t<__maybe_const_t<_Const, _First>>> |
| 8783 | { return __x._M_current == __y._M_current; } |
| 8784 | |
| 8785 | friend constexpr bool |
| 8786 | operator==(const _Iterator& __x, default_sentinel_t) |
| 8787 | { |
| 8788 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8789 | return ((std::get<_Is>(__x._M_current) |
| 8790 | == ranges::end(std::get<_Is>(__x._M_parent->_M_bases))) |
| 8791 | || ...); |
| 8792 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8793 | } |
| 8794 | |
| 8795 | friend constexpr auto |
| 8796 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 8797 | requires __detail::__all_random_access<_Const, _First, _Vs...> |
| 8798 | { return __x._M_current <=> __y._M_current; } |
| 8799 | |
| 8800 | friend constexpr _Iterator |
| 8801 | operator+(_Iterator __x, difference_type __y) |
| 8802 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8803 | { return __x += __y; } |
| 8804 | |
| 8805 | friend constexpr _Iterator |
| 8806 | operator+(difference_type __x, _Iterator __y) |
| 8807 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8808 | { return __y += __x; } |
| 8809 | |
| 8810 | friend constexpr _Iterator |
| 8811 | operator-(_Iterator __x, difference_type __y) |
| 8812 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8813 | { return __x -= __y; } |
| 8814 | |
| 8815 | friend constexpr difference_type |
| 8816 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 8817 | requires __detail::__cartesian_is_sized_sentinel<_Const, iterator_t, _First, _Vs...> |
| 8818 | { return __x._M_distance_from(__y._M_current); } |
| 8819 | |
| 8820 | friend constexpr difference_type |
| 8821 | operator-(const _Iterator& __i, default_sentinel_t) |
| 8822 | requires __detail::__cartesian_is_sized_sentinel<_Const, sentinel_t, _First, _Vs...> |
| 8823 | { |
| 8824 | tuple __end_tuple = [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8825 | return tuple{ranges::end(std::get<0>(__i._M_parent->_M_bases)), |
| 8826 | ranges::begin(std::get<1 + _Is>(__i._M_parent->_M_bases))...}; |
| 8827 | }(make_index_sequence<sizeof...(_Vs)>{}); |
| 8828 | return __i._M_distance_from(__end_tuple); |
| 8829 | } |
| 8830 | |
| 8831 | friend constexpr difference_type |
| 8832 | operator-(default_sentinel_t, const _Iterator& __i) |
| 8833 | requires __detail::__cartesian_is_sized_sentinel<_Const, sentinel_t, _First, _Vs...> |
| 8834 | { return -(__i - default_sentinel); } |
| 8835 | |
| 8836 | friend constexpr auto |
| 8837 | iter_move(const _Iterator& __i) |
| 8838 | { return __detail::__tuple_transform(ranges::iter_move, __i._M_current); } |
| 8839 | |
| 8840 | friend constexpr void |
| 8841 | iter_swap(const _Iterator& __l, const _Iterator& __r) |
| 8842 | requires (indirectly_swappable<iterator_t<__maybe_const_t<_Const, _First>>> |
| 8843 | && ... |
| 8844 | && indirectly_swappable<iterator_t<__maybe_const_t<_Const, _Vs>>>) |
| 8845 | { |
| 8846 | [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8847 | (ranges::iter_swap(std::get<_Is>(__l._M_current), std::get<_Is>(__r._M_current)), ...); |
| 8848 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8849 | } |
| 8850 | |
| 8851 | private: |
| 8852 | template<size_t _Nm = sizeof...(_Vs)> |
| 8853 | constexpr void |
| 8854 | _M_next() |
| 8855 | { |
| 8856 | auto& __it = std::get<_Nm>(_M_current); |
| 8857 | ++__it; |
| 8858 | if constexpr (_Nm > 0) |
| 8859 | if (__it == ranges::end(std::get<_Nm>(_M_parent->_M_bases))) |
| 8860 | { |
| 8861 | __it = ranges::begin(std::get<_Nm>(_M_parent->_M_bases)); |
| 8862 | _M_next<_Nm - 1>(); |
| 8863 | } |
| 8864 | } |
| 8865 | |
| 8866 | template<size_t _Nm = sizeof...(_Vs)> |
| 8867 | constexpr void |
| 8868 | _M_prev() |
| 8869 | { |
| 8870 | auto& __it = std::get<_Nm>(_M_current); |
| 8871 | if constexpr (_Nm > 0) |
| 8872 | if (__it == ranges::begin(std::get<_Nm>(_M_parent->_M_bases))) |
| 8873 | { |
| 8874 | __it = __detail::__cartesian_common_arg_end(std::get<_Nm>(_M_parent->_M_bases)); |
| 8875 | _M_prev<_Nm - 1>(); |
| 8876 | } |
| 8877 | --__it; |
| 8878 | } |
| 8879 | |
| 8880 | template<size_t _Nm = sizeof...(_Vs)> |
| 8881 | constexpr void |
| 8882 | _M_advance(difference_type __x) |
| 8883 | requires __detail::__cartesian_product_is_random_access<_Const, _First, _Vs...> |
| 8884 | { |
| 8885 | if (__x == 1) |
| 8886 | _M_next<_Nm>(); |
| 8887 | else if (__x == -1) |
| 8888 | _M_prev<_Nm>(); |
| 8889 | else if (__x != 0) |
| 8890 | { |
| 8891 | // Constant time iterator advancement. |
| 8892 | auto& __r = std::get<_Nm>(_M_parent->_M_bases); |
| 8893 | auto& __it = std::get<_Nm>(_M_current); |
| 8894 | if constexpr (_Nm == 0) |
| 8895 | { |
| 8896 | #ifdef _GLIBCXX_ASSERTIONS |
| 8897 | if constexpr (sized_range<__maybe_const_t<_Const, _First>>) |
| 8898 | { |
| 8899 | auto __size = ranges::ssize(__r); |
| 8900 | auto __begin = ranges::begin(__r); |
| 8901 | auto __offset = __it - __begin; |
| 8902 | __glibcxx_assert(__offset + __x >= 0 && __offset + __x <= __size); |
| 8903 | } |
| 8904 | #endif |
| 8905 | __it += __x; |
| 8906 | } |
| 8907 | else |
| 8908 | { |
| 8909 | auto __size = ranges::ssize(__r); |
| 8910 | auto __begin = ranges::begin(__r); |
| 8911 | auto __offset = __it - __begin; |
| 8912 | __offset += __x; |
| 8913 | __x = __offset / __size; |
| 8914 | __offset %= __size; |
| 8915 | if (__offset < 0) |
| 8916 | { |
| 8917 | __offset = __size + __offset; |
| 8918 | --__x; |
| 8919 | } |
| 8920 | __it = __begin + __offset; |
| 8921 | _M_advance<_Nm - 1>(__x); |
| 8922 | } |
| 8923 | } |
| 8924 | } |
| 8925 | |
| 8926 | template<typename _Tuple> |
| 8927 | constexpr difference_type |
| 8928 | _M_distance_from(const _Tuple& __t) const |
| 8929 | { |
| 8930 | return [&]<size_t... _Is>(index_sequence<_Is...>) { |
| 8931 | auto __sum = static_cast<difference_type>(0); |
| 8932 | #ifdef _GLIBCXX_ASSERTIONS |
| 8933 | if constexpr (integral<difference_type>) |
| 8934 | { |
| 8935 | bool __overflow |
| 8936 | = (__builtin_add_overflow(__sum, _M_scaled_distance<_Is>(__t), &__sum) |
| 8937 | || ...); |
| 8938 | __glibcxx_assert(!__overflow); |
| 8939 | } |
| 8940 | else |
| 8941 | #endif |
| 8942 | __sum = (_M_scaled_distance<_Is>(__t) + ...); |
| 8943 | return __sum; |
| 8944 | }(make_index_sequence<1 + sizeof...(_Vs)>{}); |
| 8945 | } |
| 8946 | |
| 8947 | template<size_t _Nm, typename _Tuple> |
| 8948 | constexpr difference_type |
| 8949 | _M_scaled_distance(const _Tuple& __t) const |
| 8950 | { |
| 8951 | auto __dist = static_cast<difference_type>(std::get<_Nm>(_M_current) |
| 8952 | - std::get<_Nm>(__t)); |
| 8953 | #ifdef _GLIBCXX_ASSERTIONS |
| 8954 | if constexpr (integral<difference_type>) |
| 8955 | { |
| 8956 | bool __overflow = __builtin_mul_overflow(__dist, _M_scaled_size<_Nm+1>(), &__dist); |
| 8957 | __glibcxx_assert(!__overflow); |
| 8958 | } |
| 8959 | else |
| 8960 | #endif |
| 8961 | __dist *= _M_scaled_size<_Nm+1>(); |
| 8962 | return __dist; |
| 8963 | } |
| 8964 | |
| 8965 | template<size_t _Nm> |
| 8966 | constexpr difference_type |
| 8967 | _M_scaled_size() const |
| 8968 | { |
| 8969 | if constexpr (_Nm <= sizeof...(_Vs)) |
| 8970 | { |
| 8971 | auto __size = static_cast<difference_type>(ranges::size |
| 8972 | (std::get<_Nm>(_M_parent->_M_bases))); |
| 8973 | #ifdef _GLIBCXX_ASSERTIONS |
| 8974 | if constexpr (integral<difference_type>) |
| 8975 | { |
| 8976 | bool __overflow = __builtin_mul_overflow(__size, _M_scaled_size<_Nm+1>(), &__size); |
| 8977 | __glibcxx_assert(!__overflow); |
| 8978 | } |
| 8979 | else |
| 8980 | #endif |
| 8981 | __size *= _M_scaled_size<_Nm+1>(); |
| 8982 | return __size; |
| 8983 | } |
| 8984 | else |
| 8985 | return static_cast<difference_type>(1); |
| 8986 | } |
| 8987 | }; |
| 8988 | |
| 8989 | namespace views |
| 8990 | { |
| 8991 | namespace __detail |
| 8992 | { |
| 8993 | template<typename... _Ts> |
| 8994 | concept __can_cartesian_product_view |
| 8995 | = requires { cartesian_product_view<all_t<_Ts>...>(std::declval<_Ts>()...); }; |
| 8996 | } |
| 8997 | |
| 8998 | struct _CartesianProduct |
| 8999 | { |
| 9000 | template<typename... _Ts> |
| 9001 | requires (sizeof...(_Ts) == 0 || __detail::__can_cartesian_product_view<_Ts...>) |
| 9002 | constexpr auto |
| 9003 | operator() [[nodiscard]] (_Ts&&... __ts) const |
| 9004 | { |
| 9005 | if constexpr (sizeof...(_Ts) == 0) |
| 9006 | return views::single(tuple{}); |
| 9007 | else |
| 9008 | return cartesian_product_view<all_t<_Ts>...>(std::forward<_Ts>(__ts)...); |
| 9009 | } |
| 9010 | }; |
| 9011 | |
| 9012 | inline constexpr _CartesianProduct cartesian_product; |
| 9013 | } |
| 9014 | #endif // __cpp_lib_ranges_cartesian_product |
| 9015 | |
| 9016 | #ifdef __cpp_lib_ranges_as_rvalue // C++ >= 23 |
| 9017 | template<input_range _Vp> |
| 9018 | requires view<_Vp> |
| 9019 | class as_rvalue_view : public view_interface<as_rvalue_view<_Vp>> |
| 9020 | { |
| 9021 | _Vp _M_base = _Vp(); |
| 9022 | |
| 9023 | public: |
| 9024 | as_rvalue_view() requires default_initializable<_Vp> = default; |
| 9025 | |
| 9026 | constexpr explicit |
| 9027 | as_rvalue_view(_Vp __base) |
| 9028 | : _M_base(std::move(__base)) |
| 9029 | { } |
| 9030 | |
| 9031 | constexpr _Vp |
| 9032 | base() const& requires copy_constructible<_Vp> |
| 9033 | { return _M_base; } |
| 9034 | |
| 9035 | constexpr _Vp |
| 9036 | base() && |
| 9037 | { return std::move(_M_base); } |
| 9038 | |
| 9039 | constexpr auto |
| 9040 | begin() requires (!__detail::__simple_view<_Vp>) |
| 9041 | { return move_iterator(ranges::begin(_M_base)); } |
| 9042 | |
| 9043 | constexpr auto |
| 9044 | begin() const requires range<const _Vp> |
| 9045 | { return move_iterator(ranges::begin(_M_base)); } |
| 9046 | |
| 9047 | constexpr auto |
| 9048 | end() requires (!__detail::__simple_view<_Vp>) |
| 9049 | { |
| 9050 | if constexpr (common_range<_Vp>) |
| 9051 | return move_iterator(ranges::end(_M_base)); |
| 9052 | else |
| 9053 | return move_sentinel(ranges::end(_M_base)); |
| 9054 | } |
| 9055 | |
| 9056 | constexpr auto |
| 9057 | end() const requires range<const _Vp> |
| 9058 | { |
| 9059 | if constexpr (common_range<const _Vp>) |
| 9060 | return move_iterator(ranges::end(_M_base)); |
| 9061 | else |
| 9062 | return move_sentinel(ranges::end(_M_base)); |
| 9063 | } |
| 9064 | |
| 9065 | constexpr auto |
| 9066 | size() requires sized_range<_Vp> |
| 9067 | { return ranges::size(_M_base); } |
| 9068 | |
| 9069 | constexpr auto |
| 9070 | size() const requires sized_range<const _Vp> |
| 9071 | { return ranges::size(_M_base); } |
| 9072 | }; |
| 9073 | |
| 9074 | template<typename _Range> |
| 9075 | as_rvalue_view(_Range&&) -> as_rvalue_view<views::all_t<_Range>>; |
| 9076 | |
| 9077 | template<typename _Tp> |
| 9078 | inline constexpr bool enable_borrowed_range<as_rvalue_view<_Tp>> |
| 9079 | = enable_borrowed_range<_Tp>; |
| 9080 | |
| 9081 | namespace views |
| 9082 | { |
| 9083 | namespace __detail |
| 9084 | { |
| 9085 | template<typename _Tp> |
| 9086 | concept __can_as_rvalue_view = requires { as_rvalue_view(std::declval<_Tp>()); }; |
| 9087 | } |
| 9088 | |
| 9089 | struct _AsRvalue : __adaptor::_RangeAdaptorClosure<_AsRvalue> |
| 9090 | { |
| 9091 | template<viewable_range _Range> |
| 9092 | requires __detail::__can_as_rvalue_view<_Range> |
| 9093 | constexpr auto |
| 9094 | operator() [[nodiscard]] (_Range&& __r) const |
| 9095 | { |
| 9096 | if constexpr (same_as<range_rvalue_reference_t<_Range>, |
| 9097 | range_reference_t<_Range>>) |
| 9098 | return views::all(std::forward<_Range>(__r)); |
| 9099 | else |
| 9100 | return as_rvalue_view(std::forward<_Range>(__r)); |
| 9101 | } |
| 9102 | }; |
| 9103 | |
| 9104 | inline constexpr _AsRvalue as_rvalue; |
| 9105 | } |
| 9106 | #endif // __cpp_lib_as_rvalue |
| 9107 | |
| 9108 | #ifdef __cpp_lib_ranges_enumerate // C++ >= 23 |
| 9109 | namespace __detail |
| 9110 | { |
| 9111 | template<typename _Range> |
| 9112 | concept __range_with_movable_reference = input_range<_Range> |
| 9113 | && move_constructible<range_reference_t<_Range>> |
| 9114 | && move_constructible<range_rvalue_reference_t<_Range>>; |
| 9115 | } |
| 9116 | |
| 9117 | template<view _Vp> |
| 9118 | requires __detail::__range_with_movable_reference<_Vp> |
| 9119 | class enumerate_view : public view_interface<enumerate_view<_Vp>> |
| 9120 | { |
| 9121 | _Vp _M_base = _Vp(); |
| 9122 | |
| 9123 | template<bool _Const> class _Iterator; |
| 9124 | template<bool _Const> class _Sentinel; |
| 9125 | |
| 9126 | public: |
| 9127 | enumerate_view() requires default_initializable<_Vp> = default; |
| 9128 | |
| 9129 | constexpr explicit |
| 9130 | enumerate_view(_Vp __base) |
| 9131 | : _M_base(std::move(__base)) |
| 9132 | { } |
| 9133 | |
| 9134 | constexpr auto |
| 9135 | begin() requires (!__detail::__simple_view<_Vp>) |
| 9136 | { return _Iterator<false>(ranges::begin(_M_base), 0); } |
| 9137 | |
| 9138 | constexpr auto |
| 9139 | begin() const requires __detail::__range_with_movable_reference<const _Vp> |
| 9140 | { return _Iterator<true>(ranges::begin(_M_base), 0); } |
| 9141 | |
| 9142 | constexpr auto |
| 9143 | end() requires (!__detail::__simple_view<_Vp>) |
| 9144 | { |
| 9145 | if constexpr (common_range<_Vp> && sized_range<_Vp>) |
| 9146 | return _Iterator<false>(ranges::end(_M_base), ranges::distance(_M_base)); |
| 9147 | else |
| 9148 | return _Sentinel<false>(ranges::end(_M_base)); |
| 9149 | } |
| 9150 | |
| 9151 | constexpr auto |
| 9152 | end() const requires __detail::__range_with_movable_reference<const _Vp> |
| 9153 | { |
| 9154 | if constexpr (common_range<const _Vp> && sized_range<const _Vp>) |
| 9155 | return _Iterator<true>(ranges::end(_M_base), ranges::distance(_M_base)); |
| 9156 | else |
| 9157 | return _Sentinel<true>(ranges::end(_M_base)); |
| 9158 | } |
| 9159 | |
| 9160 | constexpr auto |
| 9161 | size() requires sized_range<_Vp> |
| 9162 | { return ranges::size(_M_base); } |
| 9163 | |
| 9164 | constexpr auto |
| 9165 | size() const requires sized_range<const _Vp> |
| 9166 | { return ranges::size(_M_base); } |
| 9167 | |
| 9168 | constexpr _Vp |
| 9169 | base() const & requires copy_constructible<_Vp> |
| 9170 | { return _M_base; } |
| 9171 | |
| 9172 | constexpr _Vp |
| 9173 | base() && |
| 9174 | { return std::move(_M_base); } |
| 9175 | }; |
| 9176 | |
| 9177 | template<typename _Range> |
| 9178 | enumerate_view(_Range&&) -> enumerate_view<views::all_t<_Range>>; |
| 9179 | |
| 9180 | template<typename _Tp> |
| 9181 | inline constexpr bool enable_borrowed_range<enumerate_view<_Tp>> |
| 9182 | = enable_borrowed_range<_Tp>; |
| 9183 | |
| 9184 | template<view _Vp> |
| 9185 | requires __detail::__range_with_movable_reference<_Vp> |
| 9186 | template<bool _Const> |
| 9187 | class enumerate_view<_Vp>::_Iterator |
| 9188 | { |
| 9189 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 9190 | |
| 9191 | static auto |
| 9192 | _S_iter_concept() |
| 9193 | { |
| 9194 | if constexpr (random_access_range<_Base>) |
| 9195 | return random_access_iterator_tag{}; |
| 9196 | else if constexpr (bidirectional_range<_Base>) |
| 9197 | return bidirectional_iterator_tag{}; |
| 9198 | else if constexpr (forward_range<_Base>) |
| 9199 | return forward_iterator_tag{}; |
| 9200 | else |
| 9201 | return input_iterator_tag{}; |
| 9202 | } |
| 9203 | |
| 9204 | friend enumerate_view; |
| 9205 | |
| 9206 | public: |
| 9207 | using iterator_category = input_iterator_tag; |
| 9208 | using iterator_concept = decltype(_S_iter_concept()); |
| 9209 | using difference_type = range_difference_t<_Base>; |
| 9210 | using value_type = tuple<difference_type, range_value_t<_Base>>; |
| 9211 | |
| 9212 | private: |
| 9213 | using __reference_type = tuple<difference_type, range_reference_t<_Base>>; |
| 9214 | |
| 9215 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 9216 | difference_type _M_pos = 0; |
| 9217 | |
| 9218 | constexpr explicit |
| 9219 | _Iterator(iterator_t<_Base> __current, difference_type __pos) |
| 9220 | : _M_current(std::move(__current)), _M_pos(__pos) |
| 9221 | { } |
| 9222 | |
| 9223 | public: |
| 9224 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 9225 | |
| 9226 | constexpr |
| 9227 | _Iterator(_Iterator<!_Const> __i) |
| 9228 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 9229 | : _M_current(std::move(__i._M_current)), _M_pos(__i._M_pos) |
| 9230 | { } |
| 9231 | |
| 9232 | constexpr const iterator_t<_Base> & |
| 9233 | base() const & noexcept |
| 9234 | { return _M_current; } |
| 9235 | |
| 9236 | constexpr iterator_t<_Base> |
| 9237 | base() && |
| 9238 | { return std::move(_M_current); } |
| 9239 | |
| 9240 | constexpr difference_type |
| 9241 | index() const noexcept |
| 9242 | { return _M_pos; } |
| 9243 | |
| 9244 | constexpr auto |
| 9245 | operator*() const |
| 9246 | { return __reference_type(_M_pos, *_M_current); } |
| 9247 | |
| 9248 | constexpr _Iterator& |
| 9249 | operator++() |
| 9250 | { |
| 9251 | ++_M_current; |
| 9252 | ++_M_pos; |
| 9253 | return *this; |
| 9254 | } |
| 9255 | |
| 9256 | constexpr void |
| 9257 | operator++(int) |
| 9258 | { ++*this; } |
| 9259 | |
| 9260 | constexpr _Iterator |
| 9261 | operator++(int) requires forward_range<_Base> |
| 9262 | { |
| 9263 | auto __tmp = *this; |
| 9264 | ++*this; |
| 9265 | return __tmp; |
| 9266 | } |
| 9267 | |
| 9268 | constexpr _Iterator& |
| 9269 | operator--() requires bidirectional_range<_Base> |
| 9270 | { |
| 9271 | --_M_current; |
| 9272 | --_M_pos; |
| 9273 | return *this; |
| 9274 | } |
| 9275 | |
| 9276 | constexpr _Iterator |
| 9277 | operator--(int) requires bidirectional_range<_Base> |
| 9278 | { |
| 9279 | auto __tmp = *this; |
| 9280 | --*this; |
| 9281 | return __tmp; |
| 9282 | } |
| 9283 | |
| 9284 | constexpr _Iterator& |
| 9285 | operator+=(difference_type __n) requires random_access_range<_Base> |
| 9286 | { |
| 9287 | _M_current += __n; |
| 9288 | _M_pos += __n; |
| 9289 | return *this; |
| 9290 | } |
| 9291 | |
| 9292 | constexpr _Iterator& |
| 9293 | operator-=(difference_type __n) requires random_access_range<_Base> |
| 9294 | { |
| 9295 | _M_current -= __n; |
| 9296 | _M_pos -= __n; |
| 9297 | return *this; |
| 9298 | } |
| 9299 | |
| 9300 | constexpr auto |
| 9301 | operator[](difference_type __n) const requires random_access_range<_Base> |
| 9302 | { return __reference_type(_M_pos + __n, _M_current[__n]); } |
| 9303 | |
| 9304 | friend constexpr bool |
| 9305 | operator==(const _Iterator& __x, const _Iterator& __y) noexcept |
| 9306 | { return __x._M_pos == __y._M_pos; } |
| 9307 | |
| 9308 | friend constexpr strong_ordering |
| 9309 | operator<=>(const _Iterator& __x, const _Iterator& __y) noexcept |
| 9310 | { return __x._M_pos <=> __y._M_pos; } |
| 9311 | |
| 9312 | friend constexpr _Iterator |
| 9313 | operator+(const _Iterator& __x, difference_type __y) |
| 9314 | requires random_access_range<_Base> |
| 9315 | { return (auto(__x) += __y); } |
| 9316 | |
| 9317 | friend constexpr _Iterator |
| 9318 | operator+(difference_type __x, const _Iterator& __y) |
| 9319 | requires random_access_range<_Base> |
| 9320 | { return auto(__y) += __x; } |
| 9321 | |
| 9322 | friend constexpr _Iterator |
| 9323 | operator-(const _Iterator& __x, difference_type __y) |
| 9324 | requires random_access_range<_Base> |
| 9325 | { return auto(__x) -= __y; } |
| 9326 | |
| 9327 | friend constexpr difference_type |
| 9328 | operator-(const _Iterator& __x, const _Iterator& __y) noexcept |
| 9329 | { return __x._M_pos - __y._M_pos; } |
| 9330 | |
| 9331 | friend constexpr auto |
| 9332 | iter_move(const _Iterator& __i) |
| 9333 | noexcept(noexcept(ranges::iter_move(__i._M_current)) |
| 9334 | && is_nothrow_move_constructible_v<range_rvalue_reference_t<_Base>>) |
| 9335 | { |
| 9336 | return tuple<difference_type, range_rvalue_reference_t<_Base>> |
| 9337 | (__i._M_pos, ranges::iter_move(__i._M_current)); |
| 9338 | } |
| 9339 | }; |
| 9340 | |
| 9341 | template<view _Vp> |
| 9342 | requires __detail::__range_with_movable_reference<_Vp> |
| 9343 | template<bool _Const> |
| 9344 | class enumerate_view<_Vp>::_Sentinel |
| 9345 | { |
| 9346 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 9347 | |
| 9348 | sentinel_t<_Base> _M_end = sentinel_t<_Base>(); |
| 9349 | |
| 9350 | constexpr explicit |
| 9351 | _Sentinel(sentinel_t<_Base> __end) |
| 9352 | : _M_end(std::move(__end)) |
| 9353 | { } |
| 9354 | |
| 9355 | friend enumerate_view; |
| 9356 | |
| 9357 | public: |
| 9358 | _Sentinel() = default; |
| 9359 | |
| 9360 | constexpr |
| 9361 | _Sentinel(_Sentinel<!_Const> __other) |
| 9362 | requires _Const && convertible_to<sentinel_t<_Vp>, sentinel_t<_Base>> |
| 9363 | : _M_end(std::move(__other._M_end)) |
| 9364 | { } |
| 9365 | |
| 9366 | constexpr sentinel_t<_Base> |
| 9367 | base() const |
| 9368 | { return _M_end; } |
| 9369 | |
| 9370 | template<bool _OtherConst> |
| 9371 | requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const_t<_OtherConst, _Vp>>> |
| 9372 | friend constexpr bool |
| 9373 | operator==(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 9374 | { return __x._M_current == __y._M_end; } |
| 9375 | |
| 9376 | template<bool _OtherConst> |
| 9377 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const_t<_OtherConst, _Vp>>> |
| 9378 | friend constexpr range_difference_t<__maybe_const_t<_OtherConst, _Vp>> |
| 9379 | operator-(const _Iterator<_OtherConst>& __x, const _Sentinel& __y) |
| 9380 | { return __x._M_current - __y._M_end; } |
| 9381 | |
| 9382 | template<bool _OtherConst> |
| 9383 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const_t<_OtherConst, _Vp>>> |
| 9384 | friend constexpr range_difference_t<__maybe_const_t<_OtherConst, _Vp>> |
| 9385 | operator-(const _Sentinel& __x, const _Iterator<_OtherConst>& __y) |
| 9386 | { return __x._M_end - __y._M_current; } |
| 9387 | }; |
| 9388 | |
| 9389 | namespace views |
| 9390 | { |
| 9391 | namespace __detail |
| 9392 | { |
| 9393 | template<typename _Tp> |
| 9394 | concept __can_enumerate_view |
| 9395 | = requires { enumerate_view<all_t<_Tp>>(std::declval<_Tp>()); }; |
| 9396 | } |
| 9397 | |
| 9398 | struct _Enumerate : __adaptor::_RangeAdaptorClosure<_Enumerate> |
| 9399 | { |
| 9400 | template<viewable_range _Range> |
| 9401 | requires __detail::__can_enumerate_view<_Range> |
| 9402 | constexpr auto |
| 9403 | operator() [[nodiscard]] (_Range&& __r) const |
| 9404 | { return enumerate_view<all_t<_Range>>(std::forward<_Range>(__r)); } |
| 9405 | }; |
| 9406 | |
| 9407 | inline constexpr _Enumerate enumerate; |
| 9408 | } |
| 9409 | #endif // __cpp_lib_ranges_enumerate |
| 9410 | |
| 9411 | #ifdef __cpp_lib_ranges_as_const // C++ >= 23 |
| 9412 | template<view _Vp> |
| 9413 | requires input_range<_Vp> |
| 9414 | class as_const_view : public view_interface<as_const_view<_Vp>> |
| 9415 | { |
| 9416 | _Vp _M_base = _Vp(); |
| 9417 | |
| 9418 | public: |
| 9419 | as_const_view() requires default_initializable<_Vp> = default; |
| 9420 | |
| 9421 | constexpr explicit |
| 9422 | as_const_view(_Vp __base) |
| 9423 | noexcept(is_nothrow_move_constructible_v<_Vp>) |
| 9424 | : _M_base(std::move(__base)) |
| 9425 | { } |
| 9426 | |
| 9427 | constexpr _Vp |
| 9428 | base() const & |
| 9429 | noexcept(is_nothrow_copy_constructible_v<_Vp>) |
| 9430 | requires copy_constructible<_Vp> |
| 9431 | { return _M_base; } |
| 9432 | |
| 9433 | constexpr _Vp |
| 9434 | base() && |
| 9435 | noexcept(is_nothrow_move_constructible_v<_Vp>) |
| 9436 | { return std::move(_M_base); } |
| 9437 | |
| 9438 | constexpr auto |
| 9439 | begin() requires (!__detail::__simple_view<_Vp>) |
| 9440 | { return ranges::cbegin(_M_base); } |
| 9441 | |
| 9442 | constexpr auto |
| 9443 | begin() const requires range<const _Vp> |
| 9444 | { return ranges::cbegin(_M_base); } |
| 9445 | |
| 9446 | constexpr auto |
| 9447 | end() requires (!__detail::__simple_view<_Vp>) |
| 9448 | { return ranges::cend(_M_base); } |
| 9449 | |
| 9450 | constexpr auto |
| 9451 | end() const requires range<const _Vp> |
| 9452 | { return ranges::cend(_M_base); } |
| 9453 | |
| 9454 | constexpr auto |
| 9455 | size() requires sized_range<_Vp> |
| 9456 | { return ranges::size(_M_base); } |
| 9457 | |
| 9458 | constexpr auto |
| 9459 | size() const requires sized_range<const _Vp> |
| 9460 | { return ranges::size(_M_base); } |
| 9461 | }; |
| 9462 | |
| 9463 | template<typename _Range> |
| 9464 | as_const_view(_Range&&) -> as_const_view<views::all_t<_Range>>; |
| 9465 | |
| 9466 | template<typename _Tp> |
| 9467 | inline constexpr bool enable_borrowed_range<as_const_view<_Tp>> |
| 9468 | = enable_borrowed_range<_Tp>; |
| 9469 | |
| 9470 | namespace views |
| 9471 | { |
| 9472 | namespace __detail |
| 9473 | { |
| 9474 | template<typename _Tp> |
| 9475 | inline constexpr bool __is_constable_ref_view = false; |
| 9476 | |
| 9477 | template<typename _Range> |
| 9478 | inline constexpr bool __is_constable_ref_view<ref_view<_Range>> |
| 9479 | = constant_range<const _Range>; |
| 9480 | |
| 9481 | template<typename _Range> |
| 9482 | concept __can_as_const_view = requires { as_const_view(std::declval<_Range>()); }; |
| 9483 | } |
| 9484 | |
| 9485 | struct _AsConst : __adaptor::_RangeAdaptorClosure<_AsConst> |
| 9486 | { |
| 9487 | template<viewable_range _Range> |
| 9488 | constexpr auto |
| 9489 | operator()(_Range&& __r) const |
| 9490 | noexcept(noexcept(as_const_view(std::declval<_Range>()))) |
| 9491 | requires __detail::__can_as_const_view<_Range> |
| 9492 | { |
| 9493 | using _Tp = remove_cvref_t<_Range>; |
| 9494 | using element_type = remove_reference_t<range_reference_t<_Range>>; |
| 9495 | if constexpr (constant_range<views::all_t<_Range>>) |
| 9496 | return views::all(std::forward<_Range>(__r)); |
| 9497 | else if constexpr (__detail::__is_empty_view<_Tp>) |
| 9498 | return views::empty<const element_type>; |
| 9499 | #if __cpp_lib_optional >= 202506L && __cpp_lib_optional_range_support // >= C++26 |
| 9500 | else if constexpr (__is_optional_ref_v<_Tp>) |
| 9501 | return optional<const typename _Tp::value_type&>(__r); |
| 9502 | #endif |
| 9503 | else if constexpr (std::__detail::__is_span<_Tp>) |
| 9504 | return span<const element_type, _Tp::extent>(std::forward<_Range>(__r)); |
| 9505 | else if constexpr (__detail::__is_constable_ref_view<_Tp>) |
| 9506 | return ref_view(std::as_const(std::forward<_Range>(__r).base())); |
| 9507 | else if constexpr (is_lvalue_reference_v<_Range> |
| 9508 | && constant_range<const _Tp> |
| 9509 | && !view<_Tp>) |
| 9510 | return ref_view(static_cast<const _Tp&>(__r)); |
| 9511 | else |
| 9512 | return as_const_view(std::forward<_Range>(__r)); |
| 9513 | } |
| 9514 | }; |
| 9515 | |
| 9516 | inline constexpr _AsConst as_const; |
| 9517 | } |
| 9518 | #endif // __cpp_lib_as_const |
| 9519 | } // namespace ranges |
| 9520 | |
| 9521 | namespace views = ranges::views; |
| 9522 | |
| 9523 | #if __cpp_lib_ranges_to_container // C++ >= 23 |
| 9524 | namespace ranges |
| 9525 | { |
| 9526 | /// @cond undocumented |
| 9527 | namespace __detail |
| 9528 | { |
| 9529 | template<typename _Container> |
| 9530 | constexpr bool __reservable_container |
| 9531 | = sized_range<_Container> |
| 9532 | && requires(_Container& __c, range_size_t<_Container> __n) { |
| 9533 | __c.reserve(__n); |
| 9534 | { __c.capacity() } -> same_as<decltype(__n)>; |
| 9535 | { __c.max_size() } -> same_as<decltype(__n)>; |
| 9536 | }; |
| 9537 | |
| 9538 | template<typename _Cont, typename _Range> |
| 9539 | constexpr bool __toable = requires { |
| 9540 | requires (!input_range<_Cont> |
| 9541 | || convertible_to<range_reference_t<_Range>, |
| 9542 | range_value_t<_Cont>>); |
| 9543 | }; |
| 9544 | } // namespace __detail |
| 9545 | /// @endcond |
| 9546 | |
| 9547 | /// Convert a range to a container. |
| 9548 | /** |
| 9549 | * @tparam _Cont A container type. |
| 9550 | * @param __r A range that models the `input_range` concept. |
| 9551 | * @param __args... Arguments to pass to the container constructor. |
| 9552 | * @since C++23 |
| 9553 | * |
| 9554 | * This function converts a range to the `_Cont` type. |
| 9555 | * |
| 9556 | * For example, `std::ranges::to<std::vector<int>>(some_view)` |
| 9557 | * will convert the view to `std::vector<int>`. |
| 9558 | * |
| 9559 | * Additional constructor arguments for the container can be supplied after |
| 9560 | * the input range argument, e.g. |
| 9561 | * `std::ranges::to<std::vector<int, Alloc<int>>>(a_range, an_allocator)`. |
| 9562 | */ |
| 9563 | template<typename _Cont, input_range _Rg, typename... _Args> |
| 9564 | requires (!view<_Cont>) |
| 9565 | constexpr _Cont |
| 9566 | to [[nodiscard]] (_Rg&& __r, _Args&&... __args) |
| 9567 | { |
| 9568 | static_assert(!is_const_v<_Cont> && !is_volatile_v<_Cont>); |
| 9569 | static_assert(is_class_v<_Cont> || is_union_v<_Cont>); |
| 9570 | |
| 9571 | if constexpr (__detail::__toable<_Cont, _Rg>) |
| 9572 | { |
| 9573 | if constexpr (constructible_from<_Cont, _Rg, _Args...>) |
| 9574 | return _Cont(std::forward<_Rg>(__r), |
| 9575 | std::forward<_Args>(__args)...); |
| 9576 | else if constexpr (constructible_from<_Cont, from_range_t, _Rg, _Args...>) |
| 9577 | return _Cont(from_range, std::forward<_Rg>(__r), |
| 9578 | std::forward<_Args>(__args)...); |
| 9579 | else if constexpr (requires { requires common_range<_Rg>; |
| 9580 | typename __iter_category_t<iterator_t<_Rg>>; |
| 9581 | requires derived_from<__iter_category_t<iterator_t<_Rg>>, |
| 9582 | input_iterator_tag>; |
| 9583 | requires constructible_from<_Cont, iterator_t<_Rg>, |
| 9584 | sentinel_t<_Rg>, _Args...>; |
| 9585 | }) |
| 9586 | return _Cont(ranges::begin(__r), ranges::end(__r), |
| 9587 | std::forward<_Args>(__args)...); |
| 9588 | else |
| 9589 | { |
| 9590 | static_assert(constructible_from<_Cont, _Args...>); |
| 9591 | _Cont __c(std::forward<_Args>(__args)...); |
| 9592 | if constexpr (sized_range<_Rg> |
| 9593 | && __detail::__reservable_container<_Cont>) |
| 9594 | __c.reserve(static_cast<range_size_t<_Cont>>(ranges::size(__r))); |
| 9595 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 9596 | // 4016. container-insertable checks do not match what |
| 9597 | // container-inserter does |
| 9598 | auto __it = ranges::begin(__r); |
| 9599 | const auto __sent = ranges::end(__r); |
| 9600 | while (__it != __sent) |
| 9601 | { |
| 9602 | if constexpr (requires { __c.emplace_back(*__it); }) |
| 9603 | __c.emplace_back(*__it); |
| 9604 | else if constexpr (requires { __c.push_back(*__it); }) |
| 9605 | __c.push_back(*__it); |
| 9606 | else if constexpr (requires { __c.emplace(__c.end(), *__it); }) |
| 9607 | __c.emplace(__c.end(), *__it); |
| 9608 | else |
| 9609 | __c.insert(__c.end(), *__it); |
| 9610 | ++__it; |
| 9611 | } |
| 9612 | return __c; |
| 9613 | } |
| 9614 | } |
| 9615 | else |
| 9616 | { |
| 9617 | static_assert(input_range<range_reference_t<_Rg>>); |
| 9618 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 9619 | // 3984. ranges::to's recursion branch may be ill-formed |
| 9620 | return ranges::to<_Cont>(ref_view(__r) | views::transform( |
| 9621 | []<typename _Elt>(_Elt&& __elem) { |
| 9622 | using _ValT = range_value_t<_Cont>; |
| 9623 | return ranges::to<_ValT>(std::forward<_Elt>(__elem)); |
| 9624 | }), std::forward<_Args>(__args)...); |
| 9625 | } |
| 9626 | } |
| 9627 | |
| 9628 | /// @cond undocumented |
| 9629 | namespace __detail |
| 9630 | { |
| 9631 | template<typename _Rg> |
| 9632 | struct _InputIter |
| 9633 | { |
| 9634 | using iterator_category = input_iterator_tag; |
| 9635 | using value_type = range_value_t<_Rg>; |
| 9636 | using difference_type = ptrdiff_t; |
| 9637 | using pointer = add_pointer_t<range_reference_t<_Rg>>; |
| 9638 | using reference = range_reference_t<_Rg>; |
| 9639 | reference operator*() const; |
| 9640 | pointer operator->() const; |
| 9641 | _InputIter& operator++(); |
| 9642 | _InputIter operator++(int); |
| 9643 | bool operator==(const _InputIter&) const; |
| 9644 | }; |
| 9645 | |
| 9646 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9647 | typename... _Args> |
| 9648 | using _DeduceExpr1 |
| 9649 | = decltype(_Cont(std::declval<_Rg>(), std::declval<_Args>()...)); |
| 9650 | |
| 9651 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9652 | typename... _Args> |
| 9653 | using _DeduceExpr2 |
| 9654 | = decltype(_Cont(from_range, std::declval<_Rg>(), |
| 9655 | std::declval<_Args>()...)); |
| 9656 | |
| 9657 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9658 | typename... _Args> |
| 9659 | using _DeduceExpr3 |
| 9660 | = decltype(_Cont(std::declval<_InputIter<_Rg>>(), |
| 9661 | std::declval<_InputIter<_Rg>>(), |
| 9662 | std::declval<_Args>()...)); |
| 9663 | |
| 9664 | } // namespace __detail |
| 9665 | /// @endcond |
| 9666 | |
| 9667 | template<template<typename...> typename _Cont, input_range _Rg, |
| 9668 | typename... _Args> |
| 9669 | constexpr auto |
| 9670 | to [[nodiscard]] (_Rg&& __r, _Args&&... __args) |
| 9671 | { |
| 9672 | using __detail::_DeduceExpr1; |
| 9673 | using __detail::_DeduceExpr2; |
| 9674 | using __detail::_DeduceExpr3; |
| 9675 | if constexpr (requires { typename _DeduceExpr1<_Cont, _Rg, _Args...>; }) |
| 9676 | return ranges::to<_DeduceExpr1<_Cont, _Rg, _Args...>>( |
| 9677 | std::forward<_Rg>(__r), std::forward<_Args>(__args)...); |
| 9678 | else if constexpr (requires { typename _DeduceExpr2<_Cont, _Rg, _Args...>; }) |
| 9679 | return ranges::to<_DeduceExpr2<_Cont, _Rg, _Args...>>( |
| 9680 | std::forward<_Rg>(__r), std::forward<_Args>(__args)...); |
| 9681 | else if constexpr (requires { typename _DeduceExpr3<_Cont, _Rg, _Args...>; }) |
| 9682 | return ranges::to<_DeduceExpr3<_Cont, _Rg, _Args...>>( |
| 9683 | std::forward<_Rg>(__r), std::forward<_Args>(__args)...); |
| 9684 | else |
| 9685 | static_assert(false); // Cannot deduce container specialization. |
| 9686 | } |
| 9687 | |
| 9688 | /// @cond undocumented |
| 9689 | namespace __detail |
| 9690 | { |
| 9691 | template<typename _Cont> |
| 9692 | struct _To |
| 9693 | { |
| 9694 | template<typename _Range, typename... _Args> |
| 9695 | requires requires { ranges::to<_Cont>(std::declval<_Range>(), |
| 9696 | std::declval<_Args>()...); } |
| 9697 | constexpr auto |
| 9698 | operator()(_Range&& __r, _Args&&... __args) const |
| 9699 | { |
| 9700 | return ranges::to<_Cont>(std::forward<_Range>(__r), |
| 9701 | std::forward<_Args>(__args)...); |
| 9702 | } |
| 9703 | }; |
| 9704 | } // namespace __detail |
| 9705 | /// @endcond |
| 9706 | |
| 9707 | /// ranges::to adaptor for converting a range to a container type |
| 9708 | /** |
| 9709 | * @tparam _Cont A container type. |
| 9710 | * @param __args... Arguments to pass to the container constructor. |
| 9711 | * @since C++23 |
| 9712 | * |
| 9713 | * This range adaptor returns a range adaptor closure object that converts |
| 9714 | * a range to the `_Cont` type. |
| 9715 | * |
| 9716 | * For example, `some_view | std::ranges::to<std::vector<int>>()` |
| 9717 | * will convert the view to `std::vector<int>`. |
| 9718 | * |
| 9719 | * Additional constructor arguments for the container can be supplied, e.g. |
| 9720 | * `r | std::ranges::to<std::vector<int, Alloc<int>>>(an_allocator)`. |
| 9721 | */ |
| 9722 | template<typename _Cont, typename... _Args> |
| 9723 | requires (!view<_Cont>) |
| 9724 | constexpr auto |
| 9725 | to [[nodiscard]] (_Args&&... __args) |
| 9726 | { |
| 9727 | static_assert(!is_const_v<_Cont> && !is_volatile_v<_Cont>); |
| 9728 | static_assert(is_class_v<_Cont> || is_union_v<_Cont>); |
| 9729 | |
| 9730 | using __detail::_To; |
| 9731 | using views::__adaptor::_Partial; |
| 9732 | return _Partial<_To<_Cont>, decay_t<_Args>...>{0, std::forward<_Args>(__args)...}; |
| 9733 | } |
| 9734 | |
| 9735 | /// @cond undocumented |
| 9736 | namespace __detail |
| 9737 | { |
| 9738 | template<template<typename...> typename _Cont> |
| 9739 | struct _To2 |
| 9740 | { |
| 9741 | template<typename _Range, typename... _Args> |
| 9742 | requires requires { ranges::to<_Cont>(std::declval<_Range>(), |
| 9743 | std::declval<_Args>()...); } |
| 9744 | constexpr auto |
| 9745 | operator()(_Range&& __r, _Args&&... __args) const |
| 9746 | { |
| 9747 | return ranges::to<_Cont>(std::forward<_Range>(__r), |
| 9748 | std::forward<_Args>(__args)...); |
| 9749 | } |
| 9750 | }; |
| 9751 | } // namespace __detail |
| 9752 | /// @endcond |
| 9753 | |
| 9754 | /// ranges::to adaptor for converting a range to a deduced container type. |
| 9755 | /** |
| 9756 | * @tparam _Cont A container template. |
| 9757 | * @param __args... Arguments to pass to the container constructor. |
| 9758 | * @since C++23 |
| 9759 | * |
| 9760 | * This range adaptor returns a range adaptor closure object that converts |
| 9761 | * a range to a specialization of the `_Cont` class template. The specific |
| 9762 | * specialization of `_Cont` to be used is deduced automatically. |
| 9763 | * |
| 9764 | * For example, `some_view | std::ranges::to<std::vector>(Alloc<int>{})` |
| 9765 | * will convert the view to `std::vector<T, Alloc<T>>`, where `T` is the |
| 9766 | * view's value type, i.e. `std::ranges::range_value_t<decltype(some_view)>`. |
| 9767 | * |
| 9768 | * Additional constructor arguments for the container can be supplied, e.g. |
| 9769 | * `r | std::ranges::to<std::vector>(an_allocator)`. |
| 9770 | */ |
| 9771 | template<template<typename...> typename _Cont, typename... _Args> |
| 9772 | constexpr auto |
| 9773 | to [[nodiscard]] (_Args&&... __args) |
| 9774 | { |
| 9775 | using __detail::_To2; |
| 9776 | using views::__adaptor::_Partial; |
| 9777 | return _Partial<_To2<_Cont>, decay_t<_Args>...>{0, std::forward<_Args>(__args)...}; |
| 9778 | } |
| 9779 | |
| 9780 | } // namespace ranges |
| 9781 | #endif // __cpp_lib_ranges_to_container |
| 9782 | |
| 9783 | #if __cpp_lib_ranges_concat // C++ >= C++26 |
| 9784 | namespace ranges |
| 9785 | { |
| 9786 | namespace __detail |
| 9787 | { |
| 9788 | template<typename... _Rs> |
| 9789 | using __concat_reference_t = common_reference_t<range_reference_t<_Rs>...>; |
| 9790 | |
| 9791 | template<typename... _Rs> |
| 9792 | using __concat_value_t = common_type_t<range_value_t<_Rs>...>; |
| 9793 | |
| 9794 | template<typename... _Rs> |
| 9795 | using __concat_rvalue_reference_t |
| 9796 | = common_reference_t<range_rvalue_reference_t<_Rs>...>; |
| 9797 | |
| 9798 | template<typename _Ref, typename _RRef, typename _It> |
| 9799 | concept __concat_indirectly_readable_impl = requires(const _It __it) { |
| 9800 | { *__it } -> convertible_to<_Ref>; |
| 9801 | { ranges::iter_move(__it) } -> convertible_to<_RRef>; |
| 9802 | }; |
| 9803 | |
| 9804 | template<typename... _Rs> |
| 9805 | concept __concat_indirectly_readable |
| 9806 | = common_reference_with<__concat_reference_t<_Rs...>&&, __concat_value_t<_Rs...>&> |
| 9807 | && common_reference_with<__concat_reference_t<_Rs...>&&, |
| 9808 | __concat_rvalue_reference_t<_Rs...>&&> |
| 9809 | && common_reference_with<__concat_rvalue_reference_t<_Rs...>&&, |
| 9810 | __concat_value_t<_Rs...> const&> |
| 9811 | && (__concat_indirectly_readable_impl<__concat_reference_t<_Rs...>, |
| 9812 | __concat_rvalue_reference_t<_Rs...>, |
| 9813 | iterator_t<_Rs>> |
| 9814 | && ...); |
| 9815 | |
| 9816 | template<typename... _Rs> |
| 9817 | concept __concatable = requires { |
| 9818 | typename __concat_reference_t<_Rs...>; |
| 9819 | typename __concat_value_t<_Rs...>; |
| 9820 | typename __concat_rvalue_reference_t<_Rs...>; |
| 9821 | } && __concat_indirectly_readable<_Rs...>; |
| 9822 | |
| 9823 | template<bool _Const, typename _Range, typename... _Rs> |
| 9824 | struct __all_but_last_common |
| 9825 | { |
| 9826 | static inline constexpr bool value |
| 9827 | = requires { requires (common_range<__maybe_const_t<_Const, _Range>> |
| 9828 | && __all_but_last_common<_Const, _Rs...>::value); }; |
| 9829 | }; |
| 9830 | |
| 9831 | template<bool _Const, typename _Range> |
| 9832 | struct __all_but_last_common<_Const, _Range> |
| 9833 | { static inline constexpr bool value = true; }; |
| 9834 | |
| 9835 | template<bool _Const, typename... _Rs> |
| 9836 | concept __concat_is_random_access = __all_random_access<_Const, _Rs...> |
| 9837 | && __all_but_last_common<_Const, _Rs...>::value; |
| 9838 | |
| 9839 | template<bool _Const, typename... _Rs> |
| 9840 | concept __concat_is_bidirectional = __all_bidirectional<_Const, _Rs...> |
| 9841 | && __all_but_last_common<_Const, _Rs...>::value; |
| 9842 | |
| 9843 | template<typename _Range, typename... _Rs> |
| 9844 | struct __all_but_first_sized |
| 9845 | { static inline constexpr bool value = (sized_range<_Rs> && ...); }; |
| 9846 | } // namespace __detail |
| 9847 | |
| 9848 | template<input_range... _Vs> |
| 9849 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && __detail::__concatable<_Vs...> |
| 9850 | class concat_view : public view_interface<concat_view<_Vs...>> |
| 9851 | { |
| 9852 | tuple<_Vs...> _M_views; |
| 9853 | |
| 9854 | template<bool _Const> class _Iterator; |
| 9855 | |
| 9856 | public: |
| 9857 | constexpr concat_view() = default; |
| 9858 | |
| 9859 | constexpr explicit |
| 9860 | concat_view(_Vs... __views) |
| 9861 | : _M_views(std::move(__views)...) |
| 9862 | { } |
| 9863 | |
| 9864 | constexpr _Iterator<false> |
| 9865 | begin() requires (!(__detail::__simple_view<_Vs> && ...)) |
| 9866 | { |
| 9867 | _Iterator<false> __it(this, in_place_index<0>, ranges::begin(std::get<0>(_M_views))); |
| 9868 | __it.template _M_satisfy<0>(); |
| 9869 | return __it; |
| 9870 | } |
| 9871 | |
| 9872 | constexpr _Iterator<true> |
| 9873 | begin() const requires (range<const _Vs> && ...) && __detail::__concatable<const _Vs...> |
| 9874 | { |
| 9875 | _Iterator<true> __it(this, in_place_index<0>, ranges::begin(std::get<0>(_M_views))); |
| 9876 | __it.template _M_satisfy<0>(); |
| 9877 | return __it; |
| 9878 | } |
| 9879 | |
| 9880 | constexpr auto |
| 9881 | end() requires (!(__detail::__simple_view<_Vs> && ...)) |
| 9882 | { |
| 9883 | constexpr auto __n = sizeof...(_Vs); |
| 9884 | if constexpr (__detail::__all_forward<false, _Vs...> |
| 9885 | && common_range<_Vs...[__n - 1]>) |
| 9886 | return _Iterator<false>(this, in_place_index<__n - 1>, |
| 9887 | ranges::end(std::get<__n - 1>(_M_views))); |
| 9888 | else |
| 9889 | return default_sentinel; |
| 9890 | } |
| 9891 | |
| 9892 | constexpr auto |
| 9893 | end() const requires (range<const _Vs> && ...) && __detail::__concatable<const _Vs...> |
| 9894 | { |
| 9895 | constexpr auto __n = sizeof...(_Vs); |
| 9896 | if constexpr (__detail::__all_forward<true, _Vs...> |
| 9897 | && common_range<const _Vs...[__n - 1]>) |
| 9898 | return _Iterator<true>(this, in_place_index<__n - 1>, |
| 9899 | ranges::end(std::get<__n - 1>(_M_views))); |
| 9900 | else |
| 9901 | return default_sentinel; |
| 9902 | } |
| 9903 | |
| 9904 | constexpr auto |
| 9905 | size() requires (sized_range<_Vs>&&...) |
| 9906 | { |
| 9907 | return std::apply([](auto... __sizes) { |
| 9908 | using _CT = __detail::__make_unsigned_like_t<common_type_t<decltype(__sizes)...>>; |
| 9909 | return (_CT(__sizes) + ...); |
| 9910 | }, __detail::__tuple_transform(ranges::size, _M_views)); |
| 9911 | } |
| 9912 | |
| 9913 | constexpr auto |
| 9914 | size() const requires (sized_range<const _Vs>&&...) |
| 9915 | { |
| 9916 | return std::apply([](auto... __sizes) { |
| 9917 | using _CT = __detail::__make_unsigned_like_t<common_type_t<decltype(__sizes)...>>; |
| 9918 | return (_CT(__sizes) + ...); |
| 9919 | }, __detail::__tuple_transform(ranges::size, _M_views)); |
| 9920 | } |
| 9921 | }; |
| 9922 | |
| 9923 | template<typename... _Rs> |
| 9924 | concat_view(_Rs&&...) -> concat_view<views::all_t<_Rs>...>; |
| 9925 | |
| 9926 | namespace __detail |
| 9927 | { |
| 9928 | template<bool _Const, typename... _Vs> |
| 9929 | struct __concat_view_iter_cat |
| 9930 | { }; |
| 9931 | |
| 9932 | template<bool _Const, typename... _Vs> |
| 9933 | requires __detail::__all_forward<_Const, _Vs...> |
| 9934 | struct __concat_view_iter_cat<_Const, _Vs...> |
| 9935 | { |
| 9936 | static auto |
| 9937 | _S_iter_cat() |
| 9938 | { |
| 9939 | if constexpr (!is_reference_v<__concat_reference_t<__maybe_const_t<_Const, _Vs>...>>) |
| 9940 | return input_iterator_tag{}; |
| 9941 | else |
| 9942 | return []<typename... _Cats>(_Cats... __cats) { |
| 9943 | if constexpr ((derived_from<_Cats, random_access_iterator_tag> && ...) |
| 9944 | && __concat_is_random_access<_Const, _Vs...>) |
| 9945 | return random_access_iterator_tag{}; |
| 9946 | else if constexpr ((derived_from<_Cats, bidirectional_iterator_tag> && ...) |
| 9947 | && __concat_is_bidirectional<_Const, _Vs...>) |
| 9948 | return bidirectional_iterator_tag{}; |
| 9949 | else if constexpr ((derived_from<_Cats, forward_iterator_tag> && ...)) |
| 9950 | return forward_iterator_tag{}; |
| 9951 | else |
| 9952 | return input_iterator_tag{}; |
| 9953 | }(typename iterator_traits<iterator_t<__maybe_const_t<_Const, _Vs>>> |
| 9954 | ::iterator_category{}...); |
| 9955 | } |
| 9956 | }; |
| 9957 | } |
| 9958 | |
| 9959 | template<input_range... _Vs> |
| 9960 | requires (view<_Vs> && ...) && (sizeof...(_Vs) > 0) && __detail::__concatable<_Vs...> |
| 9961 | template<bool _Const> |
| 9962 | class concat_view<_Vs...>::_Iterator |
| 9963 | : public __detail::__concat_view_iter_cat<_Const, _Vs...> |
| 9964 | { |
| 9965 | static auto |
| 9966 | _S_iter_concept() |
| 9967 | { |
| 9968 | if constexpr (__detail::__concat_is_random_access<_Const, _Vs...>) |
| 9969 | return random_access_iterator_tag{}; |
| 9970 | else if constexpr (__detail::__concat_is_bidirectional<_Const, _Vs...>) |
| 9971 | return bidirectional_iterator_tag{}; |
| 9972 | else if constexpr (__detail::__all_forward<_Const, _Vs...>) |
| 9973 | return forward_iterator_tag{}; |
| 9974 | else |
| 9975 | return input_iterator_tag{}; |
| 9976 | } |
| 9977 | |
| 9978 | friend concat_view; |
| 9979 | friend _Iterator<!_Const>; |
| 9980 | |
| 9981 | public: |
| 9982 | // iterator_category defined in __concat_view_iter_cat |
| 9983 | using iterator_concept = decltype(_S_iter_concept()); |
| 9984 | using value_type = __detail::__concat_value_t<__maybe_const_t<_Const, _Vs>...>; |
| 9985 | using difference_type = common_type_t<range_difference_t<__maybe_const_t<_Const, _Vs>>...>; |
| 9986 | |
| 9987 | private: |
| 9988 | using __base_iter = variant<iterator_t<__maybe_const_t<_Const, _Vs>>...>; |
| 9989 | |
| 9990 | __maybe_const_t<_Const, concat_view>* _M_parent = nullptr; |
| 9991 | __base_iter _M_it; |
| 9992 | |
| 9993 | template<size_t _Nm> |
| 9994 | constexpr void |
| 9995 | _M_satisfy() |
| 9996 | { |
| 9997 | if constexpr (_Nm < (sizeof...(_Vs) - 1)) |
| 9998 | { |
| 9999 | if (std::get<_Nm>(_M_it) == ranges::end(std::get<_Nm>(_M_parent->_M_views))) |
| 10000 | { |
| 10001 | _M_it.template emplace<_Nm + 1>(ranges::begin |
| 10002 | (std::get<_Nm + 1>(_M_parent->_M_views))); |
| 10003 | _M_satisfy<_Nm + 1>(); |
| 10004 | } |
| 10005 | } |
| 10006 | } |
| 10007 | |
| 10008 | template<size_t _Nm> |
| 10009 | constexpr void |
| 10010 | _M_prev() |
| 10011 | { |
| 10012 | if constexpr (_Nm == 0) |
| 10013 | --std::get<0>(_M_it); |
| 10014 | else |
| 10015 | { |
| 10016 | if (std::get<_Nm>(_M_it) == ranges::begin(std::get<_Nm>(_M_parent->_M_views))) |
| 10017 | { |
| 10018 | _M_it.template emplace<_Nm - 1>(ranges::end |
| 10019 | (std::get<_Nm - 1>(_M_parent->_M_views))); |
| 10020 | _M_prev<_Nm - 1>(); |
| 10021 | } |
| 10022 | else |
| 10023 | --std::get<_Nm>(_M_it); |
| 10024 | } |
| 10025 | } |
| 10026 | |
| 10027 | template<size_t _Nm> |
| 10028 | constexpr void |
| 10029 | _M_advance_fwd(difference_type __offset, difference_type __steps) |
| 10030 | { |
| 10031 | using _Dt = iter_difference_t<variant_alternative_t<_Nm, __base_iter>>; |
| 10032 | if constexpr (_Nm == sizeof...(_Vs) - 1) |
| 10033 | std::get<_Nm>(_M_it) += static_cast<_Dt>(__steps); |
| 10034 | else |
| 10035 | { |
| 10036 | auto __n_size = ranges::distance(std::get<_Nm>(_M_parent->_M_views)); |
| 10037 | if (__offset + __steps < __n_size) |
| 10038 | std::get<_Nm>(_M_it) += static_cast<_Dt>(__steps); |
| 10039 | else |
| 10040 | { |
| 10041 | _M_it.template emplace<_Nm + 1>(ranges::begin |
| 10042 | (std::get<_Nm + 1>(_M_parent->_M_views))); |
| 10043 | _M_advance_fwd<_Nm + 1>(0, __offset + __steps - __n_size); |
| 10044 | } |
| 10045 | } |
| 10046 | } |
| 10047 | |
| 10048 | template<size_t _Nm> |
| 10049 | constexpr void |
| 10050 | _M_advance_bwd(difference_type __offset, difference_type __steps) |
| 10051 | { |
| 10052 | using _Dt = iter_difference_t<variant_alternative_t<_Nm, __base_iter>>; |
| 10053 | if constexpr (_Nm == 0) |
| 10054 | std::get<_Nm>(_M_it) -= static_cast<_Dt>(__steps); |
| 10055 | else { |
| 10056 | if (__offset >= __steps) |
| 10057 | std::get<_Nm>(_M_it) -= static_cast<_Dt>(__steps); |
| 10058 | else |
| 10059 | { |
| 10060 | auto __prev_size = ranges::distance(std::get<_Nm - 1>(_M_parent->_M_views)); |
| 10061 | _M_it.template emplace<_Nm - 1>(ranges::end |
| 10062 | (std::get<_Nm - 1>(_M_parent->_M_views))); |
| 10063 | _M_advance_bwd<_Nm - 1>(__prev_size, __steps - __offset); |
| 10064 | } |
| 10065 | } |
| 10066 | } |
| 10067 | |
| 10068 | // Invoke the function object __f, which has a call operator with a size_t |
| 10069 | // template parameter (corresponding to an index into the pack of views), |
| 10070 | // using the runtime value of __index as the template argument. |
| 10071 | template<typename _Fp> |
| 10072 | static constexpr auto |
| 10073 | _S_invoke_with_runtime_index(_Fp&& __f, size_t __index) |
| 10074 | { |
| 10075 | return [&__f, __index]<size_t _Idx>(this auto&& __self) { |
| 10076 | if (_Idx == __index) |
| 10077 | return __f.template operator()<_Idx>(); |
| 10078 | if constexpr (_Idx + 1 < sizeof...(_Vs)) |
| 10079 | return __self.template operator()<_Idx + 1>(); |
| 10080 | __builtin_unreachable(); |
| 10081 | }.template operator()<0>(); |
| 10082 | } |
| 10083 | |
| 10084 | template<typename _Fp> |
| 10085 | constexpr auto |
| 10086 | _M_invoke_with_runtime_index(_Fp&& __f) |
| 10087 | { return _S_invoke_with_runtime_index(std::forward<_Fp>(__f), _M_it.index()); } |
| 10088 | |
| 10089 | template<typename... _Args> |
| 10090 | explicit constexpr |
| 10091 | _Iterator(__maybe_const_t<_Const, concat_view>* __parent, _Args&&... __args) |
| 10092 | requires constructible_from<__base_iter, _Args&&...> |
| 10093 | : _M_parent(__parent), _M_it(std::forward<_Args>(__args)...) |
| 10094 | { } |
| 10095 | |
| 10096 | public: |
| 10097 | _Iterator() = default; |
| 10098 | |
| 10099 | constexpr |
| 10100 | _Iterator(_Iterator<!_Const> __it) |
| 10101 | requires _Const && (convertible_to<iterator_t<_Vs>, iterator_t<const _Vs>> && ...) |
| 10102 | : _M_parent(__it._M_parent), |
| 10103 | _M_it(_S_invoke_with_runtime_index([this, &__it]<size_t _Idx>() { |
| 10104 | return __base_iter(in_place_index<_Idx>, |
| 10105 | std::get<_Idx>(std::move(__it._M_it))); |
| 10106 | }, __it._M_it.index())) |
| 10107 | { } |
| 10108 | |
| 10109 | constexpr decltype(auto) |
| 10110 | operator*() const |
| 10111 | { |
| 10112 | __glibcxx_assert(!_M_it.valueless_by_exception()); |
| 10113 | using reference = __detail::__concat_reference_t<__maybe_const_t<_Const, _Vs>...>; |
| 10114 | return std::visit([](auto&& __it) -> reference { return *__it; }, _M_it); |
| 10115 | } |
| 10116 | |
| 10117 | constexpr _Iterator& |
| 10118 | operator++() |
| 10119 | { |
| 10120 | _M_invoke_with_runtime_index([this]<size_t _Idx>() { |
| 10121 | ++std::get<_Idx>(_M_it); |
| 10122 | _M_satisfy<_Idx>(); |
| 10123 | }); |
| 10124 | return *this; |
| 10125 | } |
| 10126 | |
| 10127 | constexpr void |
| 10128 | operator++(int) |
| 10129 | { ++*this; } |
| 10130 | |
| 10131 | constexpr _Iterator |
| 10132 | operator++(int) |
| 10133 | requires __detail::__all_forward<_Const, _Vs...> |
| 10134 | { |
| 10135 | auto __tmp = *this; |
| 10136 | ++*this; |
| 10137 | return __tmp; |
| 10138 | } |
| 10139 | |
| 10140 | constexpr _Iterator& |
| 10141 | operator--() |
| 10142 | requires __detail::__concat_is_bidirectional<_Const, _Vs...> |
| 10143 | { |
| 10144 | __glibcxx_assert(!_M_it.valueless_by_exception()); |
| 10145 | _M_invoke_with_runtime_index([this]<size_t _Idx>() { |
| 10146 | _M_prev<_Idx>(); |
| 10147 | }); |
| 10148 | return *this; |
| 10149 | } |
| 10150 | |
| 10151 | constexpr _Iterator |
| 10152 | operator--(int) |
| 10153 | requires __detail::__concat_is_bidirectional<_Const, _Vs...> |
| 10154 | { |
| 10155 | auto __tmp = *this; |
| 10156 | --*this; |
| 10157 | return __tmp; |
| 10158 | } |
| 10159 | |
| 10160 | constexpr _Iterator& |
| 10161 | operator+=(difference_type __n) |
| 10162 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10163 | { |
| 10164 | __glibcxx_assert(!_M_it.valueless_by_exception()); |
| 10165 | _M_invoke_with_runtime_index([this, __n]<size_t _Idx>() { |
| 10166 | auto __begin = ranges::begin(std::get<_Idx>(_M_parent->_M_views)); |
| 10167 | if (__n > 0) |
| 10168 | _M_advance_fwd<_Idx>(std::get<_Idx>(_M_it) - __begin, __n); |
| 10169 | else if (__n < 0) |
| 10170 | _M_advance_bwd<_Idx>(std::get<_Idx>(_M_it) - __begin, -__n); |
| 10171 | }); |
| 10172 | return *this; |
| 10173 | } |
| 10174 | |
| 10175 | constexpr _Iterator& |
| 10176 | operator-=(difference_type __n) |
| 10177 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10178 | { |
| 10179 | *this += -__n; |
| 10180 | return *this; |
| 10181 | } |
| 10182 | |
| 10183 | constexpr decltype(auto) |
| 10184 | operator[](difference_type __n) const |
| 10185 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10186 | { return *((*this) + __n); } |
| 10187 | |
| 10188 | friend constexpr bool |
| 10189 | operator==(const _Iterator& __x, const _Iterator& __y) |
| 10190 | requires (equality_comparable<iterator_t<__maybe_const_t<_Const, _Vs>>> && ...) |
| 10191 | { |
| 10192 | __glibcxx_assert(!__x._M_it.valueless_by_exception()); |
| 10193 | __glibcxx_assert(!__y._M_it.valueless_by_exception()); |
| 10194 | return __x._M_it == __y._M_it; |
| 10195 | } |
| 10196 | |
| 10197 | friend constexpr bool |
| 10198 | operator==(const _Iterator& __it, default_sentinel_t) |
| 10199 | { |
| 10200 | __glibcxx_assert(!__it._M_it.valueless_by_exception()); |
| 10201 | constexpr auto __last_idx = sizeof...(_Vs) - 1; |
| 10202 | return (__it._M_it.index() == __last_idx |
| 10203 | && (std::get<__last_idx>(__it._M_it) |
| 10204 | == ranges::end(std::get<__last_idx>(__it._M_parent->_M_views)))); |
| 10205 | } |
| 10206 | |
| 10207 | friend constexpr bool |
| 10208 | operator<(const _Iterator& __x, const _Iterator& __y) |
| 10209 | requires __detail::__all_random_access<_Const, _Vs...> |
| 10210 | { return __x._M_it < __y._M_it; } |
| 10211 | |
| 10212 | friend constexpr bool |
| 10213 | operator>(const _Iterator& __x, const _Iterator& __y) |
| 10214 | requires __detail::__all_random_access<_Const, _Vs...> |
| 10215 | { return __x._M_it > __y._M_it; } |
| 10216 | |
| 10217 | friend constexpr bool |
| 10218 | operator<=(const _Iterator& __x, const _Iterator& __y) |
| 10219 | requires __detail::__all_random_access<_Const, _Vs...> |
| 10220 | { return __x._M_it <= __y._M_it; } |
| 10221 | |
| 10222 | friend constexpr bool |
| 10223 | operator>=(const _Iterator& __x, const _Iterator& __y) |
| 10224 | requires __detail::__all_random_access<_Const, _Vs...> |
| 10225 | { return __x._M_it >= __y._M_it; } |
| 10226 | |
| 10227 | friend constexpr auto |
| 10228 | operator<=>(const _Iterator& __x, const _Iterator& __y) |
| 10229 | requires __detail::__all_random_access<_Const, _Vs...> |
| 10230 | && (three_way_comparable<iterator_t<__maybe_const_t<_Const, _Vs>>> && ...) |
| 10231 | { return __x._M_it <=> __y._M_it; } |
| 10232 | |
| 10233 | friend constexpr _Iterator |
| 10234 | operator+(const _Iterator& __it, difference_type __n) |
| 10235 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10236 | { return auto(__it) += __n; } |
| 10237 | |
| 10238 | friend constexpr _Iterator |
| 10239 | operator+(difference_type __n, const _Iterator& __it) |
| 10240 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10241 | { return __it + __n; } |
| 10242 | |
| 10243 | friend constexpr _Iterator |
| 10244 | operator-(const _Iterator& __it, difference_type __n) |
| 10245 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10246 | { return auto(__it) -= __n; } |
| 10247 | |
| 10248 | friend constexpr difference_type |
| 10249 | operator-(const _Iterator& __x, const _Iterator& __y) |
| 10250 | requires __detail::__concat_is_random_access<_Const, _Vs...> |
| 10251 | { |
| 10252 | return _S_invoke_with_runtime_index([&]<size_t _Ix>() -> difference_type { |
| 10253 | return _S_invoke_with_runtime_index([&]<size_t _Iy>() -> difference_type { |
| 10254 | if constexpr (_Ix > _Iy) |
| 10255 | { |
| 10256 | auto __dy = ranges::distance(std::get<_Iy>(__y._M_it), |
| 10257 | ranges::end(std::get<_Iy>(__y._M_parent |
| 10258 | ->_M_views))); |
| 10259 | auto __dx = ranges::distance(ranges::begin(std::get<_Ix>(__x._M_parent |
| 10260 | ->_M_views)), |
| 10261 | std::get<_Ix>(__x._M_it)); |
| 10262 | difference_type __s = 0; |
| 10263 | [&]<size_t _Idx = _Iy + 1>(this auto&& __self) { |
| 10264 | if constexpr (_Idx < _Ix) |
| 10265 | { |
| 10266 | __s += ranges::size(std::get<_Idx>(__x._M_parent->_M_views)); |
| 10267 | __self.template operator()<_Idx + 1>(); |
| 10268 | } |
| 10269 | }(); |
| 10270 | return __dy + __s + __dx; |
| 10271 | } |
| 10272 | else if constexpr (_Ix < _Iy) |
| 10273 | return -(__y - __x); |
| 10274 | else |
| 10275 | return std::get<_Ix>(__x._M_it) - std::get<_Iy>(__y._M_it); |
| 10276 | }, __y._M_it.index()); |
| 10277 | }, __x._M_it.index()); |
| 10278 | } |
| 10279 | |
| 10280 | friend constexpr difference_type |
| 10281 | operator-(const _Iterator& __x, default_sentinel_t) |
| 10282 | requires (sized_sentinel_for<sentinel_t<__maybe_const_t<_Const, _Vs>>, |
| 10283 | iterator_t<__maybe_const_t<_Const, _Vs>>> && ...) |
| 10284 | && __detail::__all_but_first_sized<__maybe_const_t<_Const, _Vs>...>::value |
| 10285 | { |
| 10286 | return _S_invoke_with_runtime_index([&]<size_t _Ix>() -> difference_type { |
| 10287 | auto __dx = ranges::distance(std::get<_Ix>(__x._M_it), |
| 10288 | ranges::end(std::get<_Ix>(__x._M_parent->_M_views))); |
| 10289 | difference_type __s = 0; |
| 10290 | [&]<size_t _Idx = _Ix + 1>(this auto&& __self) { |
| 10291 | if constexpr (_Idx < sizeof...(_Vs)) |
| 10292 | { |
| 10293 | __s += ranges::size(std::get<_Idx>(__x._M_parent->_M_views)); |
| 10294 | __self.template operator()<_Idx + 1>(); |
| 10295 | } |
| 10296 | }(); |
| 10297 | return -(__dx + __s); |
| 10298 | }, __x._M_it.index()); |
| 10299 | } |
| 10300 | |
| 10301 | friend constexpr difference_type |
| 10302 | operator-(default_sentinel_t, const _Iterator& __x) |
| 10303 | requires (sized_sentinel_for<sentinel_t<__maybe_const_t<_Const, _Vs>>, |
| 10304 | iterator_t<__maybe_const_t<_Const, _Vs>>> && ...) |
| 10305 | && __detail::__all_but_first_sized<__maybe_const_t<_Const, _Vs>...>::value |
| 10306 | { return -(__x - default_sentinel); } |
| 10307 | |
| 10308 | friend constexpr decltype(auto) |
| 10309 | iter_move(const _Iterator& __it) |
| 10310 | { |
| 10311 | using _Res = __detail::__concat_rvalue_reference_t<__maybe_const_t<_Const, _Vs>...>; |
| 10312 | return std::visit([](const auto& __i) -> _Res { |
| 10313 | return ranges::iter_move(__i); |
| 10314 | }, __it._M_it); |
| 10315 | } |
| 10316 | |
| 10317 | friend constexpr void |
| 10318 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 10319 | requires swappable_with<iter_reference_t<_Iterator>, iter_reference_t<_Iterator>> |
| 10320 | && (... && indirectly_swappable<iterator_t<__maybe_const_t<_Const, _Vs>>>) |
| 10321 | { |
| 10322 | std::visit([&]<typename _Tp, typename _Up>(const _Tp& __it1, const _Up& __it2) { |
| 10323 | if constexpr (is_same_v<_Tp, _Up>) |
| 10324 | ranges::iter_swap(__it1, __it2); |
| 10325 | else |
| 10326 | ranges::swap(*__it1, *__it2); |
| 10327 | }, __x._M_it, __y._M_it); |
| 10328 | } |
| 10329 | }; |
| 10330 | |
| 10331 | namespace views |
| 10332 | { |
| 10333 | namespace __detail |
| 10334 | { |
| 10335 | template<typename... _Ts> |
| 10336 | concept __can_concat_view = requires { concat_view(std::declval<_Ts>()...); }; |
| 10337 | } |
| 10338 | |
| 10339 | struct _Concat |
| 10340 | { |
| 10341 | template<typename... _Ts> |
| 10342 | requires __detail::__can_concat_view<_Ts...> |
| 10343 | constexpr auto |
| 10344 | operator() [[nodiscard]] (_Ts&&... __ts) const |
| 10345 | { return concat_view(std::forward<_Ts>(__ts)...); } |
| 10346 | |
| 10347 | template<input_range _Range> |
| 10348 | constexpr auto |
| 10349 | operator() [[nodiscard]] (_Range&& __t) const |
| 10350 | { return views::all(std::forward<_Range>(__t)); } |
| 10351 | }; |
| 10352 | |
| 10353 | inline constexpr _Concat concat; |
| 10354 | } |
| 10355 | |
| 10356 | } // namespace ranges |
| 10357 | #endif // __cpp_lib_ranges_concat |
| 10358 | |
| 10359 | #if __cpp_lib_ranges_cache_latest // C++ >= 26 |
| 10360 | namespace ranges |
| 10361 | { |
| 10362 | template<input_range _Vp> |
| 10363 | requires view<_Vp> |
| 10364 | class cache_latest_view : public view_interface<cache_latest_view<_Vp>> |
| 10365 | { |
| 10366 | _Vp _M_base = _Vp(); |
| 10367 | |
| 10368 | using __cache_t = __conditional_t<is_reference_v<range_reference_t<_Vp>>, |
| 10369 | add_pointer_t<range_reference_t<_Vp>>, |
| 10370 | range_reference_t<_Vp>>; |
| 10371 | __detail::__non_propagating_cache<__cache_t> _M_cache; |
| 10372 | |
| 10373 | class _Iterator; |
| 10374 | class _Sentinel; |
| 10375 | |
| 10376 | public: |
| 10377 | cache_latest_view() requires default_initializable<_Vp> = default; |
| 10378 | |
| 10379 | constexpr explicit |
| 10380 | cache_latest_view(_Vp __base) |
| 10381 | : _M_base(std::move(__base)) |
| 10382 | { } |
| 10383 | |
| 10384 | constexpr _Vp |
| 10385 | base() const & requires copy_constructible<_Vp> |
| 10386 | { return _M_base; } |
| 10387 | |
| 10388 | constexpr _Vp |
| 10389 | base() && |
| 10390 | { return std::move(_M_base); } |
| 10391 | |
| 10392 | constexpr auto |
| 10393 | begin() |
| 10394 | { return _Iterator(*this); } |
| 10395 | |
| 10396 | constexpr auto |
| 10397 | end() |
| 10398 | { return _Sentinel(*this); } |
| 10399 | |
| 10400 | constexpr auto |
| 10401 | size() requires sized_range<_Vp> |
| 10402 | { return ranges::size(_M_base); } |
| 10403 | |
| 10404 | constexpr auto |
| 10405 | size() const requires sized_range<const _Vp> |
| 10406 | { return ranges::size(_M_base); } |
| 10407 | }; |
| 10408 | |
| 10409 | template<typename _Range> |
| 10410 | cache_latest_view(_Range&&) -> cache_latest_view<views::all_t<_Range>>; |
| 10411 | |
| 10412 | template<input_range _Vp> |
| 10413 | requires view<_Vp> |
| 10414 | class cache_latest_view<_Vp>::_Iterator |
| 10415 | { |
| 10416 | cache_latest_view* _M_parent; |
| 10417 | iterator_t<_Vp> _M_current; |
| 10418 | |
| 10419 | constexpr explicit |
| 10420 | _Iterator(cache_latest_view& __parent) |
| 10421 | : _M_parent(std::__addressof(__parent)), |
| 10422 | _M_current(ranges::begin(__parent._M_base)) |
| 10423 | { } |
| 10424 | |
| 10425 | friend class cache_latest_view; |
| 10426 | |
| 10427 | public: |
| 10428 | using difference_type = range_difference_t<_Vp>; |
| 10429 | using value_type = range_value_t<_Vp>; |
| 10430 | using iterator_concept = input_iterator_tag; |
| 10431 | |
| 10432 | _Iterator(_Iterator&&) = default; |
| 10433 | |
| 10434 | _Iterator& |
| 10435 | operator=(_Iterator&&) = default; |
| 10436 | |
| 10437 | constexpr iterator_t<_Vp> |
| 10438 | base() && |
| 10439 | { return std::move(_M_current); } |
| 10440 | |
| 10441 | constexpr const iterator_t<_Vp>& |
| 10442 | base() const & noexcept |
| 10443 | { return _M_current; } |
| 10444 | |
| 10445 | constexpr range_reference_t<_Vp>& |
| 10446 | operator*() const |
| 10447 | { |
| 10448 | if constexpr (is_reference_v<range_reference_t<_Vp>>) |
| 10449 | { |
| 10450 | if (!_M_parent->_M_cache) |
| 10451 | _M_parent->_M_cache = std::__addressof(__detail::__as_lvalue(*_M_current)); |
| 10452 | return **_M_parent->_M_cache; |
| 10453 | } |
| 10454 | else |
| 10455 | { |
| 10456 | if (!_M_parent->_M_cache) |
| 10457 | _M_parent->_M_cache._M_emplace_deref(_M_current); |
| 10458 | return *_M_parent->_M_cache; |
| 10459 | } |
| 10460 | } |
| 10461 | |
| 10462 | constexpr _Iterator& |
| 10463 | operator++() |
| 10464 | { |
| 10465 | _M_parent->_M_cache._M_reset(); |
| 10466 | ++_M_current; |
| 10467 | return *this; |
| 10468 | } |
| 10469 | |
| 10470 | constexpr void |
| 10471 | operator++(int) |
| 10472 | { ++*this; } |
| 10473 | |
| 10474 | friend constexpr range_rvalue_reference_t<_Vp> |
| 10475 | iter_move(const _Iterator& __i) |
| 10476 | noexcept(noexcept(ranges::iter_move(__i._M_current))) |
| 10477 | { return ranges::iter_move(__i._M_current); } |
| 10478 | |
| 10479 | friend constexpr void |
| 10480 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 10481 | noexcept(noexcept(ranges::iter_swap(__x._M_current, __y._M_current))) |
| 10482 | requires indirectly_swappable<iterator_t<_Vp>> |
| 10483 | { ranges::iter_swap(__x._M_current, __y._M_current); } |
| 10484 | }; |
| 10485 | |
| 10486 | template<input_range _Vp> |
| 10487 | requires view<_Vp> |
| 10488 | class cache_latest_view<_Vp>::_Sentinel |
| 10489 | { |
| 10490 | sentinel_t<_Vp> _M_end = sentinel_t<_Vp>(); |
| 10491 | |
| 10492 | constexpr explicit |
| 10493 | _Sentinel(cache_latest_view& __parent) |
| 10494 | : _M_end(ranges::end(__parent._M_base)) |
| 10495 | { } |
| 10496 | |
| 10497 | friend class cache_latest_view; |
| 10498 | |
| 10499 | public: |
| 10500 | _Sentinel() = default; |
| 10501 | |
| 10502 | constexpr sentinel_t<_Vp> |
| 10503 | base() const |
| 10504 | { return _M_end; } |
| 10505 | |
| 10506 | friend constexpr bool |
| 10507 | operator==(const _Iterator& __x, const _Sentinel& __y) |
| 10508 | { return __x._M_current == __y._M_end; } |
| 10509 | |
| 10510 | friend constexpr range_difference_t<_Vp> |
| 10511 | operator-(const _Iterator& __x, const _Sentinel& __y) |
| 10512 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 10513 | { return __x._M_current - __y._M_end; } |
| 10514 | |
| 10515 | friend constexpr range_difference_t<_Vp> |
| 10516 | operator-(const _Sentinel& __x, const _Iterator& __y) |
| 10517 | requires sized_sentinel_for<sentinel_t<_Vp>, iterator_t<_Vp>> |
| 10518 | { return __x._M_end - __y._M_current; } |
| 10519 | }; |
| 10520 | |
| 10521 | namespace views |
| 10522 | { |
| 10523 | namespace __detail |
| 10524 | { |
| 10525 | template<typename _Tp> |
| 10526 | concept __can_cache_latest = requires { cache_latest_view(std::declval<_Tp>()); }; |
| 10527 | } |
| 10528 | |
| 10529 | struct _CacheLatest : __adaptor::_RangeAdaptorClosure<_CacheLatest> |
| 10530 | { |
| 10531 | template<viewable_range _Range> |
| 10532 | requires __detail::__can_cache_latest<_Range> |
| 10533 | constexpr auto |
| 10534 | operator() [[nodiscard]] (_Range&& __r) const |
| 10535 | { return cache_latest_view(std::forward<_Range>(__r)); } |
| 10536 | |
| 10537 | static constexpr bool _S_has_simple_call_op = true; |
| 10538 | }; |
| 10539 | |
| 10540 | inline constexpr _CacheLatest cache_latest; |
| 10541 | } |
| 10542 | } // namespace ranges |
| 10543 | #endif // __cpp_lib_ranges_cache_latest |
| 10544 | |
| 10545 | #if __cpp_lib_ranges_as_input // C++ >= 26 |
| 10546 | namespace ranges |
| 10547 | { |
| 10548 | template<input_range _Vp> |
| 10549 | requires view<_Vp> |
| 10550 | class as_input_view : public view_interface<as_input_view<_Vp>> |
| 10551 | { |
| 10552 | _Vp _M_base = _Vp(); |
| 10553 | |
| 10554 | template<bool _Const> |
| 10555 | class _Iterator; |
| 10556 | |
| 10557 | public: |
| 10558 | as_input_view() requires default_initializable<_Vp> = default; |
| 10559 | |
| 10560 | constexpr explicit |
| 10561 | as_input_view(_Vp __base) |
| 10562 | : _M_base(std::move(__base)) |
| 10563 | { } |
| 10564 | |
| 10565 | constexpr _Vp |
| 10566 | base() const & requires copy_constructible<_Vp> |
| 10567 | { return _M_base; } |
| 10568 | |
| 10569 | constexpr _Vp |
| 10570 | base() && |
| 10571 | { return std::move(_M_base); } |
| 10572 | |
| 10573 | constexpr auto |
| 10574 | begin() requires (!__detail::__simple_view<_Vp>) |
| 10575 | { return _Iterator<false>(ranges::begin(_M_base)); } |
| 10576 | |
| 10577 | constexpr auto |
| 10578 | begin() const requires range<const _Vp> |
| 10579 | { return _Iterator<true>(ranges::begin(_M_base)); } |
| 10580 | |
| 10581 | constexpr auto |
| 10582 | end() requires (!__detail::__simple_view<_Vp>) |
| 10583 | { return ranges::end(_M_base); } |
| 10584 | |
| 10585 | constexpr auto |
| 10586 | end() const requires range<const _Vp> |
| 10587 | { return ranges::end(_M_base); } |
| 10588 | |
| 10589 | constexpr auto |
| 10590 | size() requires sized_range<_Vp> |
| 10591 | { return ranges::size(_M_base); } |
| 10592 | |
| 10593 | constexpr auto |
| 10594 | size() const requires sized_range<const _Vp> |
| 10595 | { return ranges::size(_M_base); } |
| 10596 | }; |
| 10597 | |
| 10598 | template<typename _Range> |
| 10599 | as_input_view(_Range&&) -> as_input_view<views::all_t<_Range>>; |
| 10600 | |
| 10601 | template<input_range _Vp> |
| 10602 | requires view<_Vp> |
| 10603 | template<bool _Const> |
| 10604 | class as_input_view<_Vp>::_Iterator |
| 10605 | { |
| 10606 | using _Base = __maybe_const_t<_Const, _Vp>; |
| 10607 | |
| 10608 | iterator_t<_Base> _M_current = iterator_t<_Base>(); |
| 10609 | |
| 10610 | constexpr explicit |
| 10611 | _Iterator(iterator_t<_Base> __current) |
| 10612 | : _M_current(std::move(__current)) |
| 10613 | { } |
| 10614 | |
| 10615 | friend as_input_view; |
| 10616 | friend _Iterator<!_Const>; |
| 10617 | |
| 10618 | public: |
| 10619 | using difference_type = range_difference_t<_Base>; |
| 10620 | using value_type = range_value_t<_Base>; |
| 10621 | using iterator_concept = input_iterator_tag; |
| 10622 | |
| 10623 | _Iterator() requires default_initializable<iterator_t<_Base>> = default; |
| 10624 | |
| 10625 | _Iterator(_Iterator&&) = default; |
| 10626 | _Iterator& operator=(_Iterator&&) = default; |
| 10627 | |
| 10628 | constexpr |
| 10629 | _Iterator(_Iterator<!_Const> __i) |
| 10630 | requires _Const && convertible_to<iterator_t<_Vp>, iterator_t<_Base>> |
| 10631 | : _M_current(std::move(__i._M_current)) |
| 10632 | { } |
| 10633 | |
| 10634 | constexpr iterator_t<_Base> |
| 10635 | base() && |
| 10636 | { return std::move(_M_current); } |
| 10637 | |
| 10638 | constexpr const iterator_t<_Base>& |
| 10639 | base() const & noexcept |
| 10640 | { return _M_current; } |
| 10641 | |
| 10642 | constexpr decltype(auto) |
| 10643 | operator*() const |
| 10644 | { return *_M_current; } |
| 10645 | |
| 10646 | constexpr _Iterator& |
| 10647 | operator++() |
| 10648 | { |
| 10649 | ++_M_current; |
| 10650 | return *this; |
| 10651 | } |
| 10652 | |
| 10653 | constexpr void |
| 10654 | operator++(int) |
| 10655 | { ++*this; } |
| 10656 | |
| 10657 | friend constexpr bool |
| 10658 | operator==(const _Iterator& __x, const sentinel_t<_Base>& __y) |
| 10659 | { return __x._M_current == __y; } |
| 10660 | |
| 10661 | friend constexpr difference_type |
| 10662 | operator-(const sentinel_t<_Base>& __y, const _Iterator& __x) |
| 10663 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 10664 | { return __y - __x._M_current; } |
| 10665 | |
| 10666 | friend constexpr difference_type |
| 10667 | operator-(const _Iterator& __x, const sentinel_t<_Base>& __y) |
| 10668 | requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<_Base>> |
| 10669 | { return __x._M_current - __y; } |
| 10670 | |
| 10671 | friend constexpr range_rvalue_reference_t<_Base> |
| 10672 | iter_move(const _Iterator& __i) |
| 10673 | noexcept(noexcept(ranges::iter_move(__i._M_current))) |
| 10674 | { return ranges::iter_move(__i._M_current); } |
| 10675 | |
| 10676 | friend constexpr void |
| 10677 | iter_swap(const _Iterator& __x, const _Iterator& __y) |
| 10678 | noexcept(noexcept(ranges::iter_swap(__x._M_current, __y._M_current))) |
| 10679 | requires indirectly_swappable<iterator_t<_Base>> |
| 10680 | { ranges::iter_swap(__x._M_current, __y._M_current); } |
| 10681 | }; |
| 10682 | |
| 10683 | namespace views |
| 10684 | { |
| 10685 | namespace __detail |
| 10686 | { |
| 10687 | template<typename _Tp> |
| 10688 | concept __can_as_input = requires { as_input_view(std::declval<_Tp>()); }; |
| 10689 | } |
| 10690 | |
| 10691 | struct _AsInput : __adaptor::_RangeAdaptorClosure<_AsInput> |
| 10692 | { |
| 10693 | template<viewable_range _Range> |
| 10694 | requires __detail::__can_as_input<_Range> |
| 10695 | constexpr auto |
| 10696 | operator() [[nodiscard]] (_Range&& __r) const |
| 10697 | { |
| 10698 | if constexpr (input_range<_Range> |
| 10699 | && !common_range<_Range> |
| 10700 | && !forward_range<_Range>) |
| 10701 | return views::all(std::forward<_Range>(__r)); |
| 10702 | else |
| 10703 | return as_input_view(std::forward<_Range>(__r)); |
| 10704 | } |
| 10705 | |
| 10706 | static constexpr bool _S_has_simple_call_op = true; |
| 10707 | }; |
| 10708 | |
| 10709 | inline constexpr _AsInput as_input; |
| 10710 | } |
| 10711 | } // namespace ranges |
| 10712 | #endif // __cpp_lib_ranges_as_input |
| 10713 | |
| 10714 | _GLIBCXX_END_NAMESPACE_VERSION |
| 10715 | } // namespace std |
| 10716 | #endif // library concepts |
| 10717 | #endif // C++2a |
| 10718 | #endif /* _GLIBCXX_RANGES */ |
| 10719 |
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