1 | // C++11 <type_traits> -*- C++ -*- |
2 | |
3 | // Copyright (C) 2007-2023 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/type_traits |
26 | * This is a Standard C++ Library header. |
27 | */ |
28 | |
29 | #ifndef _GLIBCXX_TYPE_TRAITS |
30 | #define _GLIBCXX_TYPE_TRAITS 1 |
31 | |
32 | #pragma GCC system_header |
33 | |
34 | #if __cplusplus < 201103L |
35 | # include <bits/c++0x_warning.h> |
36 | #else |
37 | |
38 | #include <bits/c++config.h> |
39 | |
40 | namespace std _GLIBCXX_VISIBILITY(default) |
41 | { |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
43 | |
44 | template<typename _Tp> |
45 | class reference_wrapper; |
46 | |
47 | /** |
48 | * @defgroup metaprogramming Metaprogramming |
49 | * @ingroup utilities |
50 | * |
51 | * Template utilities for compile-time introspection and modification, |
52 | * including type classification traits, type property inspection traits |
53 | * and type transformation traits. |
54 | * |
55 | * @since C++11 |
56 | * |
57 | * @{ |
58 | */ |
59 | |
60 | /// integral_constant |
61 | template<typename _Tp, _Tp __v> |
62 | struct integral_constant |
63 | { |
64 | static constexpr _Tp value = __v; |
65 | typedef _Tp value_type; |
66 | typedef integral_constant<_Tp, __v> type; |
67 | constexpr operator value_type() const noexcept { return value; } |
68 | #if __cplusplus > 201103L |
69 | |
70 | #define __cpp_lib_integral_constant_callable 201304L |
71 | |
72 | constexpr value_type operator()() const noexcept { return value; } |
73 | #endif |
74 | }; |
75 | |
76 | #if ! __cpp_inline_variables |
77 | template<typename _Tp, _Tp __v> |
78 | constexpr _Tp integral_constant<_Tp, __v>::value; |
79 | #endif |
80 | |
81 | /// The type used as a compile-time boolean with true value. |
82 | using true_type = integral_constant<bool, true>; |
83 | |
84 | /// The type used as a compile-time boolean with false value. |
85 | using false_type = integral_constant<bool, false>; |
86 | |
87 | /// @cond undocumented |
88 | /// bool_constant for C++11 |
89 | template<bool __v> |
90 | using __bool_constant = integral_constant<bool, __v>; |
91 | /// @endcond |
92 | |
93 | #if __cplusplus >= 201703L |
94 | # define __cpp_lib_bool_constant 201505L |
95 | /// Alias template for compile-time boolean constant types. |
96 | /// @since C++17 |
97 | template<bool __v> |
98 | using bool_constant = integral_constant<bool, __v>; |
99 | #endif |
100 | |
101 | // Metaprogramming helper types. |
102 | |
103 | // Primary template. |
104 | /// Define a member typedef `type` only if a boolean constant is true. |
105 | template<bool, typename _Tp = void> |
106 | struct enable_if |
107 | { }; |
108 | |
109 | // Partial specialization for true. |
110 | template<typename _Tp> |
111 | struct enable_if<true, _Tp> |
112 | { typedef _Tp type; }; |
113 | |
114 | // __enable_if_t (std::enable_if_t for C++11) |
115 | template<bool _Cond, typename _Tp = void> |
116 | using __enable_if_t = typename enable_if<_Cond, _Tp>::type; |
117 | |
118 | template<bool> |
119 | struct __conditional |
120 | { |
121 | template<typename _Tp, typename> |
122 | using type = _Tp; |
123 | }; |
124 | |
125 | template<> |
126 | struct __conditional<false> |
127 | { |
128 | template<typename, typename _Up> |
129 | using type = _Up; |
130 | }; |
131 | |
132 | // More efficient version of std::conditional_t for internal use (and C++11) |
133 | template<bool _Cond, typename _If, typename _Else> |
134 | using __conditional_t |
135 | = typename __conditional<_Cond>::template type<_If, _Else>; |
136 | |
137 | /// @cond undocumented |
138 | template <typename _Type> |
139 | struct __type_identity |
140 | { using type = _Type; }; |
141 | |
142 | template<typename _Tp> |
143 | using __type_identity_t = typename __type_identity<_Tp>::type; |
144 | |
145 | namespace __detail |
146 | { |
147 | // A variadic alias template that resolves to its first argument. |
148 | template<typename _Tp, typename...> |
149 | using __first_t = _Tp; |
150 | |
151 | // These are deliberately not defined. |
152 | template<typename... _Bn> |
153 | auto __or_fn(int) -> __first_t<false_type, |
154 | __enable_if_t<!bool(_Bn::value)>...>; |
155 | |
156 | template<typename... _Bn> |
157 | auto __or_fn(...) -> true_type; |
158 | |
159 | template<typename... _Bn> |
160 | auto __and_fn(int) -> __first_t<true_type, |
161 | __enable_if_t<bool(_Bn::value)>...>; |
162 | |
163 | template<typename... _Bn> |
164 | auto __and_fn(...) -> false_type; |
165 | } // namespace detail |
166 | |
167 | // Like C++17 std::dis/conjunction, but usable in C++11 and resolves |
168 | // to either true_type or false_type which allows for a more efficient |
169 | // implementation that avoids recursive class template instantiation. |
170 | template<typename... _Bn> |
171 | struct __or_ |
172 | : decltype(__detail::__or_fn<_Bn...>(0)) |
173 | { }; |
174 | |
175 | template<typename... _Bn> |
176 | struct __and_ |
177 | : decltype(__detail::__and_fn<_Bn...>(0)) |
178 | { }; |
179 | |
180 | template<typename _Pp> |
181 | struct __not_ |
182 | : __bool_constant<!bool(_Pp::value)> |
183 | { }; |
184 | /// @endcond |
185 | |
186 | #if __cplusplus >= 201703L |
187 | |
188 | /// @cond undocumented |
189 | template<typename... _Bn> |
190 | inline constexpr bool __or_v = __or_<_Bn...>::value; |
191 | template<typename... _Bn> |
192 | inline constexpr bool __and_v = __and_<_Bn...>::value; |
193 | |
194 | namespace __detail |
195 | { |
196 | template<typename /* = void */, typename _B1, typename... _Bn> |
197 | struct __disjunction_impl |
198 | { using type = _B1; }; |
199 | |
200 | template<typename _B1, typename _B2, typename... _Bn> |
201 | struct __disjunction_impl<__enable_if_t<!bool(_B1::value)>, _B1, _B2, _Bn...> |
202 | { using type = typename __disjunction_impl<void, _B2, _Bn...>::type; }; |
203 | |
204 | template<typename /* = void */, typename _B1, typename... _Bn> |
205 | struct __conjunction_impl |
206 | { using type = _B1; }; |
207 | |
208 | template<typename _B1, typename _B2, typename... _Bn> |
209 | struct __conjunction_impl<__enable_if_t<bool(_B1::value)>, _B1, _B2, _Bn...> |
210 | { using type = typename __conjunction_impl<void, _B2, _Bn...>::type; }; |
211 | } // namespace __detail |
212 | /// @endcond |
213 | |
214 | #define __cpp_lib_logical_traits 201510L |
215 | |
216 | template<typename... _Bn> |
217 | struct conjunction |
218 | : __detail::__conjunction_impl<void, _Bn...>::type |
219 | { }; |
220 | |
221 | template<> |
222 | struct conjunction<> |
223 | : true_type |
224 | { }; |
225 | |
226 | template<typename... _Bn> |
227 | struct disjunction |
228 | : __detail::__disjunction_impl<void, _Bn...>::type |
229 | { }; |
230 | |
231 | template<> |
232 | struct disjunction<> |
233 | : false_type |
234 | { }; |
235 | |
236 | template<typename _Pp> |
237 | struct negation |
238 | : __not_<_Pp>::type |
239 | { }; |
240 | |
241 | /** @ingroup variable_templates |
242 | * @{ |
243 | */ |
244 | template<typename... _Bn> |
245 | inline constexpr bool conjunction_v = conjunction<_Bn...>::value; |
246 | |
247 | template<typename... _Bn> |
248 | inline constexpr bool disjunction_v = disjunction<_Bn...>::value; |
249 | |
250 | template<typename _Pp> |
251 | inline constexpr bool negation_v = negation<_Pp>::value; |
252 | /// @} |
253 | |
254 | #endif // C++17 |
255 | |
256 | // Forward declarations |
257 | template<typename> |
258 | struct is_reference; |
259 | template<typename> |
260 | struct is_function; |
261 | template<typename> |
262 | struct is_void; |
263 | template<typename> |
264 | struct remove_cv; |
265 | template<typename> |
266 | struct is_const; |
267 | |
268 | /// @cond undocumented |
269 | template<typename> |
270 | struct __is_array_unknown_bounds; |
271 | |
272 | // Helper functions that return false_type for incomplete classes, |
273 | // incomplete unions and arrays of known bound from those. |
274 | |
275 | template <typename _Tp, size_t = sizeof(_Tp)> |
276 | constexpr true_type __is_complete_or_unbounded(__type_identity<_Tp>) |
277 | { return {}; } |
278 | |
279 | template <typename _TypeIdentity, |
280 | typename _NestedType = typename _TypeIdentity::type> |
281 | constexpr typename __or_< |
282 | is_reference<_NestedType>, |
283 | is_function<_NestedType>, |
284 | is_void<_NestedType>, |
285 | __is_array_unknown_bounds<_NestedType> |
286 | >::type __is_complete_or_unbounded(_TypeIdentity) |
287 | { return {}; } |
288 | |
289 | // __remove_cv_t (std::remove_cv_t for C++11). |
290 | template<typename _Tp> |
291 | using __remove_cv_t = typename remove_cv<_Tp>::type; |
292 | /// @endcond |
293 | |
294 | // Primary type categories. |
295 | |
296 | /// is_void |
297 | template<typename _Tp> |
298 | struct is_void |
299 | : public false_type { }; |
300 | |
301 | template<> |
302 | struct is_void<void> |
303 | : public true_type { }; |
304 | |
305 | template<> |
306 | struct is_void<const void> |
307 | : public true_type { }; |
308 | |
309 | template<> |
310 | struct is_void<volatile void> |
311 | : public true_type { }; |
312 | |
313 | template<> |
314 | struct is_void<const volatile void> |
315 | : public true_type { }; |
316 | |
317 | /// @cond undocumented |
318 | template<typename> |
319 | struct __is_integral_helper |
320 | : public false_type { }; |
321 | |
322 | template<> |
323 | struct __is_integral_helper<bool> |
324 | : public true_type { }; |
325 | |
326 | template<> |
327 | struct __is_integral_helper<char> |
328 | : public true_type { }; |
329 | |
330 | template<> |
331 | struct __is_integral_helper<signed char> |
332 | : public true_type { }; |
333 | |
334 | template<> |
335 | struct __is_integral_helper<unsigned char> |
336 | : public true_type { }; |
337 | |
338 | // We want is_integral<wchar_t> to be true (and make_signed/unsigned to work) |
339 | // even when libc doesn't provide working <wchar.h> and related functions, |
340 | // so don't check _GLIBCXX_USE_WCHAR_T here. |
341 | template<> |
342 | struct __is_integral_helper<wchar_t> |
343 | : public true_type { }; |
344 | |
345 | #ifdef _GLIBCXX_USE_CHAR8_T |
346 | template<> |
347 | struct __is_integral_helper<char8_t> |
348 | : public true_type { }; |
349 | #endif |
350 | |
351 | template<> |
352 | struct __is_integral_helper<char16_t> |
353 | : public true_type { }; |
354 | |
355 | template<> |
356 | struct __is_integral_helper<char32_t> |
357 | : public true_type { }; |
358 | |
359 | template<> |
360 | struct __is_integral_helper<short> |
361 | : public true_type { }; |
362 | |
363 | template<> |
364 | struct __is_integral_helper<unsigned short> |
365 | : public true_type { }; |
366 | |
367 | template<> |
368 | struct __is_integral_helper<int> |
369 | : public true_type { }; |
370 | |
371 | template<> |
372 | struct __is_integral_helper<unsigned int> |
373 | : public true_type { }; |
374 | |
375 | template<> |
376 | struct __is_integral_helper<long> |
377 | : public true_type { }; |
378 | |
379 | template<> |
380 | struct __is_integral_helper<unsigned long> |
381 | : public true_type { }; |
382 | |
383 | template<> |
384 | struct __is_integral_helper<long long> |
385 | : public true_type { }; |
386 | |
387 | template<> |
388 | struct __is_integral_helper<unsigned long long> |
389 | : public true_type { }; |
390 | |
391 | // Conditionalizing on __STRICT_ANSI__ here will break any port that |
392 | // uses one of these types for size_t. |
393 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
394 | __extension__ |
395 | template<> |
396 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0> |
397 | : public true_type { }; |
398 | |
399 | __extension__ |
400 | template<> |
401 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0> |
402 | : public true_type { }; |
403 | #endif |
404 | #if defined(__GLIBCXX_TYPE_INT_N_1) |
405 | __extension__ |
406 | template<> |
407 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1> |
408 | : public true_type { }; |
409 | |
410 | __extension__ |
411 | template<> |
412 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1> |
413 | : public true_type { }; |
414 | #endif |
415 | #if defined(__GLIBCXX_TYPE_INT_N_2) |
416 | __extension__ |
417 | template<> |
418 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2> |
419 | : public true_type { }; |
420 | |
421 | __extension__ |
422 | template<> |
423 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2> |
424 | : public true_type { }; |
425 | #endif |
426 | #if defined(__GLIBCXX_TYPE_INT_N_3) |
427 | __extension__ |
428 | template<> |
429 | struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3> |
430 | : public true_type { }; |
431 | |
432 | __extension__ |
433 | template<> |
434 | struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3> |
435 | : public true_type { }; |
436 | #endif |
437 | /// @endcond |
438 | |
439 | /// is_integral |
440 | template<typename _Tp> |
441 | struct is_integral |
442 | : public __is_integral_helper<__remove_cv_t<_Tp>>::type |
443 | { }; |
444 | |
445 | /// @cond undocumented |
446 | template<typename> |
447 | struct __is_floating_point_helper |
448 | : public false_type { }; |
449 | |
450 | template<> |
451 | struct __is_floating_point_helper<float> |
452 | : public true_type { }; |
453 | |
454 | template<> |
455 | struct __is_floating_point_helper<double> |
456 | : public true_type { }; |
457 | |
458 | template<> |
459 | struct __is_floating_point_helper<long double> |
460 | : public true_type { }; |
461 | |
462 | #ifdef __STDCPP_FLOAT16_T__ |
463 | template<> |
464 | struct __is_floating_point_helper<_Float16> |
465 | : public true_type { }; |
466 | #endif |
467 | |
468 | #ifdef __STDCPP_FLOAT32_T__ |
469 | template<> |
470 | struct __is_floating_point_helper<_Float32> |
471 | : public true_type { }; |
472 | #endif |
473 | |
474 | #ifdef __STDCPP_FLOAT64_T__ |
475 | template<> |
476 | struct __is_floating_point_helper<_Float64> |
477 | : public true_type { }; |
478 | #endif |
479 | |
480 | #ifdef __STDCPP_FLOAT128_T__ |
481 | template<> |
482 | struct __is_floating_point_helper<_Float128> |
483 | : public true_type { }; |
484 | #endif |
485 | |
486 | #ifdef __STDCPP_BFLOAT16_T__ |
487 | template<> |
488 | struct __is_floating_point_helper<__gnu_cxx::__bfloat16_t> |
489 | : public true_type { }; |
490 | #endif |
491 | |
492 | #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
493 | template<> |
494 | struct __is_floating_point_helper<__float128> |
495 | : public true_type { }; |
496 | #endif |
497 | /// @endcond |
498 | |
499 | /// is_floating_point |
500 | template<typename _Tp> |
501 | struct is_floating_point |
502 | : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type |
503 | { }; |
504 | |
505 | /// is_array |
506 | template<typename> |
507 | struct is_array |
508 | : public false_type { }; |
509 | |
510 | template<typename _Tp, std::size_t _Size> |
511 | struct is_array<_Tp[_Size]> |
512 | : public true_type { }; |
513 | |
514 | template<typename _Tp> |
515 | struct is_array<_Tp[]> |
516 | : public true_type { }; |
517 | |
518 | template<typename> |
519 | struct __is_pointer_helper |
520 | : public false_type { }; |
521 | |
522 | template<typename _Tp> |
523 | struct __is_pointer_helper<_Tp*> |
524 | : public true_type { }; |
525 | |
526 | /// is_pointer |
527 | template<typename _Tp> |
528 | struct is_pointer |
529 | : public __is_pointer_helper<__remove_cv_t<_Tp>>::type |
530 | { }; |
531 | |
532 | /// is_lvalue_reference |
533 | template<typename> |
534 | struct is_lvalue_reference |
535 | : public false_type { }; |
536 | |
537 | template<typename _Tp> |
538 | struct is_lvalue_reference<_Tp&> |
539 | : public true_type { }; |
540 | |
541 | /// is_rvalue_reference |
542 | template<typename> |
543 | struct is_rvalue_reference |
544 | : public false_type { }; |
545 | |
546 | template<typename _Tp> |
547 | struct is_rvalue_reference<_Tp&&> |
548 | : public true_type { }; |
549 | |
550 | template<typename> |
551 | struct __is_member_object_pointer_helper |
552 | : public false_type { }; |
553 | |
554 | template<typename _Tp, typename _Cp> |
555 | struct __is_member_object_pointer_helper<_Tp _Cp::*> |
556 | : public __not_<is_function<_Tp>>::type { }; |
557 | |
558 | /// is_member_object_pointer |
559 | template<typename _Tp> |
560 | struct is_member_object_pointer |
561 | : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type |
562 | { }; |
563 | |
564 | template<typename> |
565 | struct __is_member_function_pointer_helper |
566 | : public false_type { }; |
567 | |
568 | template<typename _Tp, typename _Cp> |
569 | struct __is_member_function_pointer_helper<_Tp _Cp::*> |
570 | : public is_function<_Tp>::type { }; |
571 | |
572 | /// is_member_function_pointer |
573 | template<typename _Tp> |
574 | struct is_member_function_pointer |
575 | : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type |
576 | { }; |
577 | |
578 | /// is_enum |
579 | template<typename _Tp> |
580 | struct is_enum |
581 | : public integral_constant<bool, __is_enum(_Tp)> |
582 | { }; |
583 | |
584 | /// is_union |
585 | template<typename _Tp> |
586 | struct is_union |
587 | : public integral_constant<bool, __is_union(_Tp)> |
588 | { }; |
589 | |
590 | /// is_class |
591 | template<typename _Tp> |
592 | struct is_class |
593 | : public integral_constant<bool, __is_class(_Tp)> |
594 | { }; |
595 | |
596 | /// is_function |
597 | template<typename _Tp> |
598 | struct is_function |
599 | : public __bool_constant<!is_const<const _Tp>::value> { }; |
600 | |
601 | template<typename _Tp> |
602 | struct is_function<_Tp&> |
603 | : public false_type { }; |
604 | |
605 | template<typename _Tp> |
606 | struct is_function<_Tp&&> |
607 | : public false_type { }; |
608 | |
609 | #define __cpp_lib_is_null_pointer 201309L |
610 | |
611 | /// is_null_pointer (LWG 2247). |
612 | template<typename _Tp> |
613 | struct is_null_pointer |
614 | : public false_type { }; |
615 | |
616 | template<> |
617 | struct is_null_pointer<std::nullptr_t> |
618 | : public true_type { }; |
619 | |
620 | template<> |
621 | struct is_null_pointer<const std::nullptr_t> |
622 | : public true_type { }; |
623 | |
624 | template<> |
625 | struct is_null_pointer<volatile std::nullptr_t> |
626 | : public true_type { }; |
627 | |
628 | template<> |
629 | struct is_null_pointer<const volatile std::nullptr_t> |
630 | : public true_type { }; |
631 | |
632 | /// __is_nullptr_t (deprecated extension). |
633 | /// @deprecated Non-standard. Use `is_null_pointer` instead. |
634 | template<typename _Tp> |
635 | struct __is_nullptr_t |
636 | : public is_null_pointer<_Tp> |
637 | { } _GLIBCXX_DEPRECATED_SUGGEST("std::is_null_pointer" ); |
638 | |
639 | // Composite type categories. |
640 | |
641 | /// is_reference |
642 | template<typename _Tp> |
643 | struct is_reference |
644 | : public false_type |
645 | { }; |
646 | |
647 | template<typename _Tp> |
648 | struct is_reference<_Tp&> |
649 | : public true_type |
650 | { }; |
651 | |
652 | template<typename _Tp> |
653 | struct is_reference<_Tp&&> |
654 | : public true_type |
655 | { }; |
656 | |
657 | /// is_arithmetic |
658 | template<typename _Tp> |
659 | struct is_arithmetic |
660 | : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
661 | { }; |
662 | |
663 | /// is_fundamental |
664 | template<typename _Tp> |
665 | struct is_fundamental |
666 | : public __or_<is_arithmetic<_Tp>, is_void<_Tp>, |
667 | is_null_pointer<_Tp>>::type |
668 | { }; |
669 | |
670 | /// is_object |
671 | template<typename _Tp> |
672 | struct is_object |
673 | : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
674 | is_void<_Tp>>>::type |
675 | { }; |
676 | |
677 | template<typename> |
678 | struct is_member_pointer; |
679 | |
680 | /// is_scalar |
681 | template<typename _Tp> |
682 | struct is_scalar |
683 | : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
684 | is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type |
685 | { }; |
686 | |
687 | /// is_compound |
688 | template<typename _Tp> |
689 | struct is_compound |
690 | : public __not_<is_fundamental<_Tp>>::type { }; |
691 | |
692 | /// @cond undocumented |
693 | template<typename _Tp> |
694 | struct __is_member_pointer_helper |
695 | : public false_type { }; |
696 | |
697 | template<typename _Tp, typename _Cp> |
698 | struct __is_member_pointer_helper<_Tp _Cp::*> |
699 | : public true_type { }; |
700 | /// @endcond |
701 | |
702 | /// is_member_pointer |
703 | template<typename _Tp> |
704 | struct is_member_pointer |
705 | : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type |
706 | { }; |
707 | |
708 | template<typename, typename> |
709 | struct is_same; |
710 | |
711 | /// @cond undocumented |
712 | template<typename _Tp, typename... _Types> |
713 | using __is_one_of = __or_<is_same<_Tp, _Types>...>; |
714 | |
715 | // Check if a type is one of the signed integer types. |
716 | __extension__ |
717 | template<typename _Tp> |
718 | using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>, |
719 | signed char, signed short, signed int, signed long, |
720 | signed long long |
721 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
722 | , signed __GLIBCXX_TYPE_INT_N_0 |
723 | #endif |
724 | #if defined(__GLIBCXX_TYPE_INT_N_1) |
725 | , signed __GLIBCXX_TYPE_INT_N_1 |
726 | #endif |
727 | #if defined(__GLIBCXX_TYPE_INT_N_2) |
728 | , signed __GLIBCXX_TYPE_INT_N_2 |
729 | #endif |
730 | #if defined(__GLIBCXX_TYPE_INT_N_3) |
731 | , signed __GLIBCXX_TYPE_INT_N_3 |
732 | #endif |
733 | >; |
734 | |
735 | // Check if a type is one of the unsigned integer types. |
736 | __extension__ |
737 | template<typename _Tp> |
738 | using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>, |
739 | unsigned char, unsigned short, unsigned int, unsigned long, |
740 | unsigned long long |
741 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
742 | , unsigned __GLIBCXX_TYPE_INT_N_0 |
743 | #endif |
744 | #if defined(__GLIBCXX_TYPE_INT_N_1) |
745 | , unsigned __GLIBCXX_TYPE_INT_N_1 |
746 | #endif |
747 | #if defined(__GLIBCXX_TYPE_INT_N_2) |
748 | , unsigned __GLIBCXX_TYPE_INT_N_2 |
749 | #endif |
750 | #if defined(__GLIBCXX_TYPE_INT_N_3) |
751 | , unsigned __GLIBCXX_TYPE_INT_N_3 |
752 | #endif |
753 | >; |
754 | |
755 | // Check if a type is one of the signed or unsigned integer types. |
756 | template<typename _Tp> |
757 | using __is_standard_integer |
758 | = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>; |
759 | |
760 | // __void_t (std::void_t for C++11) |
761 | template<typename...> using __void_t = void; |
762 | /// @endcond |
763 | |
764 | // Type properties. |
765 | |
766 | /// is_const |
767 | template<typename> |
768 | struct is_const |
769 | : public false_type { }; |
770 | |
771 | template<typename _Tp> |
772 | struct is_const<_Tp const> |
773 | : public true_type { }; |
774 | |
775 | /// is_volatile |
776 | template<typename> |
777 | struct is_volatile |
778 | : public false_type { }; |
779 | |
780 | template<typename _Tp> |
781 | struct is_volatile<_Tp volatile> |
782 | : public true_type { }; |
783 | |
784 | /// is_trivial |
785 | template<typename _Tp> |
786 | struct is_trivial |
787 | : public integral_constant<bool, __is_trivial(_Tp)> |
788 | { |
789 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
790 | "template argument must be a complete class or an unbounded array" ); |
791 | }; |
792 | |
793 | /// is_trivially_copyable |
794 | template<typename _Tp> |
795 | struct is_trivially_copyable |
796 | : public integral_constant<bool, __is_trivially_copyable(_Tp)> |
797 | { |
798 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
799 | "template argument must be a complete class or an unbounded array" ); |
800 | }; |
801 | |
802 | /// is_standard_layout |
803 | template<typename _Tp> |
804 | struct is_standard_layout |
805 | : public integral_constant<bool, __is_standard_layout(_Tp)> |
806 | { |
807 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
808 | "template argument must be a complete class or an unbounded array" ); |
809 | }; |
810 | |
811 | /** is_pod |
812 | * @deprecated Deprecated in C++20. |
813 | * Use `is_standard_layout && is_trivial` instead. |
814 | */ |
815 | // Could use is_standard_layout && is_trivial instead of the builtin. |
816 | template<typename _Tp> |
817 | struct |
818 | _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout && is_trivial" ) |
819 | is_pod |
820 | : public integral_constant<bool, __is_pod(_Tp)> |
821 | { |
822 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
823 | "template argument must be a complete class or an unbounded array" ); |
824 | }; |
825 | |
826 | /** is_literal_type |
827 | * @deprecated Deprecated in C++17, removed in C++20. |
828 | * The idea of a literal type isn't useful. |
829 | */ |
830 | template<typename _Tp> |
831 | struct |
832 | _GLIBCXX17_DEPRECATED |
833 | is_literal_type |
834 | : public integral_constant<bool, __is_literal_type(_Tp)> |
835 | { |
836 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
837 | "template argument must be a complete class or an unbounded array" ); |
838 | }; |
839 | |
840 | /// is_empty |
841 | template<typename _Tp> |
842 | struct is_empty |
843 | : public integral_constant<bool, __is_empty(_Tp)> |
844 | { }; |
845 | |
846 | /// is_polymorphic |
847 | template<typename _Tp> |
848 | struct is_polymorphic |
849 | : public integral_constant<bool, __is_polymorphic(_Tp)> |
850 | { }; |
851 | |
852 | #if __cplusplus >= 201402L |
853 | #define __cpp_lib_is_final 201402L |
854 | /// is_final |
855 | /// @since C++14 |
856 | template<typename _Tp> |
857 | struct is_final |
858 | : public integral_constant<bool, __is_final(_Tp)> |
859 | { }; |
860 | #endif |
861 | |
862 | /// is_abstract |
863 | template<typename _Tp> |
864 | struct is_abstract |
865 | : public integral_constant<bool, __is_abstract(_Tp)> |
866 | { }; |
867 | |
868 | /// @cond undocumented |
869 | template<typename _Tp, |
870 | bool = is_arithmetic<_Tp>::value> |
871 | struct __is_signed_helper |
872 | : public false_type { }; |
873 | |
874 | template<typename _Tp> |
875 | struct __is_signed_helper<_Tp, true> |
876 | : public integral_constant<bool, _Tp(-1) < _Tp(0)> |
877 | { }; |
878 | /// @endcond |
879 | |
880 | /// is_signed |
881 | template<typename _Tp> |
882 | struct is_signed |
883 | : public __is_signed_helper<_Tp>::type |
884 | { }; |
885 | |
886 | /// is_unsigned |
887 | template<typename _Tp> |
888 | struct is_unsigned |
889 | : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type |
890 | { }; |
891 | |
892 | /// @cond undocumented |
893 | template<typename _Tp, typename _Up = _Tp&&> |
894 | _Up |
895 | __declval(int); |
896 | |
897 | template<typename _Tp> |
898 | _Tp |
899 | __declval(long); |
900 | /// @endcond |
901 | |
902 | template<typename _Tp> |
903 | auto declval() noexcept -> decltype(__declval<_Tp>(0)); |
904 | |
905 | template<typename> |
906 | struct remove_all_extents; |
907 | |
908 | /// @cond undocumented |
909 | template<typename _Tp> |
910 | struct __is_array_known_bounds |
911 | : public false_type |
912 | { }; |
913 | |
914 | template<typename _Tp, size_t _Size> |
915 | struct __is_array_known_bounds<_Tp[_Size]> |
916 | : public true_type |
917 | { }; |
918 | |
919 | template<typename _Tp> |
920 | struct __is_array_unknown_bounds |
921 | : public false_type |
922 | { }; |
923 | |
924 | template<typename _Tp> |
925 | struct __is_array_unknown_bounds<_Tp[]> |
926 | : public true_type |
927 | { }; |
928 | |
929 | // Destructible and constructible type properties. |
930 | |
931 | // In N3290 is_destructible does not say anything about function |
932 | // types and abstract types, see LWG 2049. This implementation |
933 | // describes function types as non-destructible and all complete |
934 | // object types as destructible, iff the explicit destructor |
935 | // call expression is wellformed. |
936 | struct __do_is_destructible_impl |
937 | { |
938 | template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
939 | static true_type __test(int); |
940 | |
941 | template<typename> |
942 | static false_type __test(...); |
943 | }; |
944 | |
945 | template<typename _Tp> |
946 | struct __is_destructible_impl |
947 | : public __do_is_destructible_impl |
948 | { |
949 | typedef decltype(__test<_Tp>(0)) type; |
950 | }; |
951 | |
952 | template<typename _Tp, |
953 | bool = __or_<is_void<_Tp>, |
954 | __is_array_unknown_bounds<_Tp>, |
955 | is_function<_Tp>>::value, |
956 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> |
957 | struct __is_destructible_safe; |
958 | |
959 | template<typename _Tp> |
960 | struct __is_destructible_safe<_Tp, false, false> |
961 | : public __is_destructible_impl<typename |
962 | remove_all_extents<_Tp>::type>::type |
963 | { }; |
964 | |
965 | template<typename _Tp> |
966 | struct __is_destructible_safe<_Tp, true, false> |
967 | : public false_type { }; |
968 | |
969 | template<typename _Tp> |
970 | struct __is_destructible_safe<_Tp, false, true> |
971 | : public true_type { }; |
972 | /// @endcond |
973 | |
974 | /// is_destructible |
975 | template<typename _Tp> |
976 | struct is_destructible |
977 | : public __is_destructible_safe<_Tp>::type |
978 | { |
979 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
980 | "template argument must be a complete class or an unbounded array" ); |
981 | }; |
982 | |
983 | /// @cond undocumented |
984 | |
985 | // is_nothrow_destructible requires that is_destructible is |
986 | // satisfied as well. We realize that by mimicing the |
987 | // implementation of is_destructible but refer to noexcept(expr) |
988 | // instead of decltype(expr). |
989 | struct __do_is_nt_destructible_impl |
990 | { |
991 | template<typename _Tp> |
992 | static __bool_constant<noexcept(declval<_Tp&>().~_Tp())> |
993 | __test(int); |
994 | |
995 | template<typename> |
996 | static false_type __test(...); |
997 | }; |
998 | |
999 | template<typename _Tp> |
1000 | struct __is_nt_destructible_impl |
1001 | : public __do_is_nt_destructible_impl |
1002 | { |
1003 | typedef decltype(__test<_Tp>(0)) type; |
1004 | }; |
1005 | |
1006 | template<typename _Tp, |
1007 | bool = __or_<is_void<_Tp>, |
1008 | __is_array_unknown_bounds<_Tp>, |
1009 | is_function<_Tp>>::value, |
1010 | bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> |
1011 | struct __is_nt_destructible_safe; |
1012 | |
1013 | template<typename _Tp> |
1014 | struct __is_nt_destructible_safe<_Tp, false, false> |
1015 | : public __is_nt_destructible_impl<typename |
1016 | remove_all_extents<_Tp>::type>::type |
1017 | { }; |
1018 | |
1019 | template<typename _Tp> |
1020 | struct __is_nt_destructible_safe<_Tp, true, false> |
1021 | : public false_type { }; |
1022 | |
1023 | template<typename _Tp> |
1024 | struct __is_nt_destructible_safe<_Tp, false, true> |
1025 | : public true_type { }; |
1026 | /// @endcond |
1027 | |
1028 | /// is_nothrow_destructible |
1029 | template<typename _Tp> |
1030 | struct is_nothrow_destructible |
1031 | : public __is_nt_destructible_safe<_Tp>::type |
1032 | { |
1033 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1034 | "template argument must be a complete class or an unbounded array" ); |
1035 | }; |
1036 | |
1037 | /// @cond undocumented |
1038 | template<typename _Tp, typename... _Args> |
1039 | using __is_constructible_impl |
1040 | = __bool_constant<__is_constructible(_Tp, _Args...)>; |
1041 | /// @endcond |
1042 | |
1043 | /// is_constructible |
1044 | template<typename _Tp, typename... _Args> |
1045 | struct is_constructible |
1046 | : public __is_constructible_impl<_Tp, _Args...> |
1047 | { |
1048 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1049 | "template argument must be a complete class or an unbounded array" ); |
1050 | }; |
1051 | |
1052 | /// is_default_constructible |
1053 | template<typename _Tp> |
1054 | struct is_default_constructible |
1055 | : public __is_constructible_impl<_Tp> |
1056 | { |
1057 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1058 | "template argument must be a complete class or an unbounded array" ); |
1059 | }; |
1060 | |
1061 | /// @cond undocumented |
1062 | template<typename _Tp, typename = void> |
1063 | struct __add_lvalue_reference_helper |
1064 | { using type = _Tp; }; |
1065 | |
1066 | template<typename _Tp> |
1067 | struct __add_lvalue_reference_helper<_Tp, __void_t<_Tp&>> |
1068 | { using type = _Tp&; }; |
1069 | |
1070 | template<typename _Tp> |
1071 | using __add_lval_ref_t = typename __add_lvalue_reference_helper<_Tp>::type; |
1072 | /// @endcond |
1073 | |
1074 | /// is_copy_constructible |
1075 | template<typename _Tp> |
1076 | struct is_copy_constructible |
1077 | : public __is_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
1078 | { |
1079 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1080 | "template argument must be a complete class or an unbounded array" ); |
1081 | }; |
1082 | |
1083 | /// @cond undocumented |
1084 | template<typename _Tp, typename = void> |
1085 | struct __add_rvalue_reference_helper |
1086 | { using type = _Tp; }; |
1087 | |
1088 | template<typename _Tp> |
1089 | struct __add_rvalue_reference_helper<_Tp, __void_t<_Tp&&>> |
1090 | { using type = _Tp&&; }; |
1091 | |
1092 | template<typename _Tp> |
1093 | using __add_rval_ref_t = typename __add_rvalue_reference_helper<_Tp>::type; |
1094 | /// @endcond |
1095 | |
1096 | /// is_move_constructible |
1097 | template<typename _Tp> |
1098 | struct is_move_constructible |
1099 | : public __is_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
1100 | { |
1101 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1102 | "template argument must be a complete class or an unbounded array" ); |
1103 | }; |
1104 | |
1105 | /// @cond undocumented |
1106 | template<typename _Tp, typename... _Args> |
1107 | using __is_nothrow_constructible_impl |
1108 | = __bool_constant<__is_nothrow_constructible(_Tp, _Args...)>; |
1109 | /// @endcond |
1110 | |
1111 | /// is_nothrow_constructible |
1112 | template<typename _Tp, typename... _Args> |
1113 | struct is_nothrow_constructible |
1114 | : public __is_nothrow_constructible_impl<_Tp, _Args...> |
1115 | { |
1116 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1117 | "template argument must be a complete class or an unbounded array" ); |
1118 | }; |
1119 | |
1120 | /// is_nothrow_default_constructible |
1121 | template<typename _Tp> |
1122 | struct is_nothrow_default_constructible |
1123 | : public __is_nothrow_constructible_impl<_Tp> |
1124 | { |
1125 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1126 | "template argument must be a complete class or an unbounded array" ); |
1127 | }; |
1128 | |
1129 | /// is_nothrow_copy_constructible |
1130 | template<typename _Tp> |
1131 | struct is_nothrow_copy_constructible |
1132 | : public __is_nothrow_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
1133 | { |
1134 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1135 | "template argument must be a complete class or an unbounded array" ); |
1136 | }; |
1137 | |
1138 | /// is_nothrow_move_constructible |
1139 | template<typename _Tp> |
1140 | struct is_nothrow_move_constructible |
1141 | : public __is_nothrow_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
1142 | { |
1143 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1144 | "template argument must be a complete class or an unbounded array" ); |
1145 | }; |
1146 | |
1147 | /// @cond undocumented |
1148 | template<typename _Tp, typename _Up> |
1149 | using __is_assignable_impl = __bool_constant<__is_assignable(_Tp, _Up)>; |
1150 | /// @endcond |
1151 | |
1152 | /// is_assignable |
1153 | template<typename _Tp, typename _Up> |
1154 | struct is_assignable |
1155 | : public __is_assignable_impl<_Tp, _Up> |
1156 | { |
1157 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1158 | "template argument must be a complete class or an unbounded array" ); |
1159 | }; |
1160 | |
1161 | /// is_copy_assignable |
1162 | template<typename _Tp> |
1163 | struct is_copy_assignable |
1164 | : public __is_assignable_impl<__add_lval_ref_t<_Tp>, |
1165 | __add_lval_ref_t<const _Tp>> |
1166 | { |
1167 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1168 | "template argument must be a complete class or an unbounded array" ); |
1169 | }; |
1170 | |
1171 | /// is_move_assignable |
1172 | template<typename _Tp> |
1173 | struct is_move_assignable |
1174 | : public __is_assignable_impl<__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>> |
1175 | { |
1176 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1177 | "template argument must be a complete class or an unbounded array" ); |
1178 | }; |
1179 | |
1180 | /// @cond undocumented |
1181 | template<typename _Tp, typename _Up> |
1182 | using __is_nothrow_assignable_impl |
1183 | = __bool_constant<__is_nothrow_assignable(_Tp, _Up)>; |
1184 | /// @endcond |
1185 | |
1186 | /// is_nothrow_assignable |
1187 | template<typename _Tp, typename _Up> |
1188 | struct is_nothrow_assignable |
1189 | : public __is_nothrow_assignable_impl<_Tp, _Up> |
1190 | { |
1191 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1192 | "template argument must be a complete class or an unbounded array" ); |
1193 | }; |
1194 | |
1195 | /// is_nothrow_copy_assignable |
1196 | template<typename _Tp> |
1197 | struct is_nothrow_copy_assignable |
1198 | : public __is_nothrow_assignable_impl<__add_lval_ref_t<_Tp>, |
1199 | __add_lval_ref_t<const _Tp>> |
1200 | { |
1201 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1202 | "template argument must be a complete class or an unbounded array" ); |
1203 | }; |
1204 | |
1205 | /// is_nothrow_move_assignable |
1206 | template<typename _Tp> |
1207 | struct is_nothrow_move_assignable |
1208 | : public __is_nothrow_assignable_impl<__add_lval_ref_t<_Tp>, |
1209 | __add_rval_ref_t<_Tp>> |
1210 | { |
1211 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1212 | "template argument must be a complete class or an unbounded array" ); |
1213 | }; |
1214 | |
1215 | /// @cond undocumented |
1216 | template<typename _Tp, typename... _Args> |
1217 | using __is_trivially_constructible_impl |
1218 | = __bool_constant<__is_trivially_constructible(_Tp, _Args...)>; |
1219 | /// @endcond |
1220 | |
1221 | /// is_trivially_constructible |
1222 | template<typename _Tp, typename... _Args> |
1223 | struct is_trivially_constructible |
1224 | : public __is_trivially_constructible_impl<_Tp, _Args...> |
1225 | { |
1226 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1227 | "template argument must be a complete class or an unbounded array" ); |
1228 | }; |
1229 | |
1230 | /// is_trivially_default_constructible |
1231 | template<typename _Tp> |
1232 | struct is_trivially_default_constructible |
1233 | : public __is_trivially_constructible_impl<_Tp> |
1234 | { |
1235 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1236 | "template argument must be a complete class or an unbounded array" ); |
1237 | }; |
1238 | |
1239 | struct __do_is_implicitly_default_constructible_impl |
1240 | { |
1241 | template <typename _Tp> |
1242 | static void __helper(const _Tp&); |
1243 | |
1244 | template <typename _Tp> |
1245 | static true_type __test(const _Tp&, |
1246 | decltype(__helper<const _Tp&>({}))* = 0); |
1247 | |
1248 | static false_type __test(...); |
1249 | }; |
1250 | |
1251 | template<typename _Tp> |
1252 | struct __is_implicitly_default_constructible_impl |
1253 | : public __do_is_implicitly_default_constructible_impl |
1254 | { |
1255 | typedef decltype(__test(declval<_Tp>())) type; |
1256 | }; |
1257 | |
1258 | template<typename _Tp> |
1259 | struct __is_implicitly_default_constructible_safe |
1260 | : public __is_implicitly_default_constructible_impl<_Tp>::type |
1261 | { }; |
1262 | |
1263 | template <typename _Tp> |
1264 | struct __is_implicitly_default_constructible |
1265 | : public __and_<__is_constructible_impl<_Tp>, |
1266 | __is_implicitly_default_constructible_safe<_Tp>>::type |
1267 | { }; |
1268 | |
1269 | /// is_trivially_copy_constructible |
1270 | template<typename _Tp> |
1271 | struct is_trivially_copy_constructible |
1272 | : public __is_trivially_constructible_impl<_Tp, __add_lval_ref_t<const _Tp>> |
1273 | { |
1274 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1275 | "template argument must be a complete class or an unbounded array" ); |
1276 | }; |
1277 | |
1278 | /// is_trivially_move_constructible |
1279 | template<typename _Tp> |
1280 | struct is_trivially_move_constructible |
1281 | : public __is_trivially_constructible_impl<_Tp, __add_rval_ref_t<_Tp>> |
1282 | { |
1283 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1284 | "template argument must be a complete class or an unbounded array" ); |
1285 | }; |
1286 | |
1287 | /// @cond undocumented |
1288 | template<typename _Tp, typename _Up> |
1289 | using __is_trivially_assignable_impl |
1290 | = __bool_constant<__is_trivially_assignable(_Tp, _Up)>; |
1291 | /// @endcond |
1292 | |
1293 | /// is_trivially_assignable |
1294 | template<typename _Tp, typename _Up> |
1295 | struct is_trivially_assignable |
1296 | : public __is_trivially_assignable_impl<_Tp, _Up> |
1297 | { |
1298 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1299 | "template argument must be a complete class or an unbounded array" ); |
1300 | }; |
1301 | |
1302 | /// is_trivially_copy_assignable |
1303 | template<typename _Tp> |
1304 | struct is_trivially_copy_assignable |
1305 | : public __is_trivially_assignable_impl<__add_lval_ref_t<_Tp>, |
1306 | __add_lval_ref_t<const _Tp>> |
1307 | { |
1308 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1309 | "template argument must be a complete class or an unbounded array" ); |
1310 | }; |
1311 | |
1312 | /// is_trivially_move_assignable |
1313 | template<typename _Tp> |
1314 | struct is_trivially_move_assignable |
1315 | : public __is_trivially_assignable_impl<__add_lval_ref_t<_Tp>, |
1316 | __add_rval_ref_t<_Tp>> |
1317 | { |
1318 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1319 | "template argument must be a complete class or an unbounded array" ); |
1320 | }; |
1321 | |
1322 | /// is_trivially_destructible |
1323 | template<typename _Tp> |
1324 | struct is_trivially_destructible |
1325 | : public __and_<__is_destructible_safe<_Tp>, |
1326 | __bool_constant<__has_trivial_destructor(_Tp)>>::type |
1327 | { |
1328 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1329 | "template argument must be a complete class or an unbounded array" ); |
1330 | }; |
1331 | |
1332 | |
1333 | /// has_virtual_destructor |
1334 | template<typename _Tp> |
1335 | struct has_virtual_destructor |
1336 | : public integral_constant<bool, __has_virtual_destructor(_Tp)> |
1337 | { |
1338 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1339 | "template argument must be a complete class or an unbounded array" ); |
1340 | }; |
1341 | |
1342 | |
1343 | // type property queries. |
1344 | |
1345 | /// alignment_of |
1346 | template<typename _Tp> |
1347 | struct alignment_of |
1348 | : public integral_constant<std::size_t, alignof(_Tp)> |
1349 | { |
1350 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
1351 | "template argument must be a complete class or an unbounded array" ); |
1352 | }; |
1353 | |
1354 | /// rank |
1355 | template<typename> |
1356 | struct rank |
1357 | : public integral_constant<std::size_t, 0> { }; |
1358 | |
1359 | template<typename _Tp, std::size_t _Size> |
1360 | struct rank<_Tp[_Size]> |
1361 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; |
1362 | |
1363 | template<typename _Tp> |
1364 | struct rank<_Tp[]> |
1365 | : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { }; |
1366 | |
1367 | /// extent |
1368 | template<typename, unsigned _Uint = 0> |
1369 | struct extent |
1370 | : public integral_constant<size_t, 0> { }; |
1371 | |
1372 | template<typename _Tp, size_t _Size> |
1373 | struct extent<_Tp[_Size], 0> |
1374 | : public integral_constant<size_t, _Size> { }; |
1375 | |
1376 | template<typename _Tp, unsigned _Uint, size_t _Size> |
1377 | struct extent<_Tp[_Size], _Uint> |
1378 | : public extent<_Tp, _Uint - 1>::type { }; |
1379 | |
1380 | template<typename _Tp> |
1381 | struct extent<_Tp[], 0> |
1382 | : public integral_constant<size_t, 0> { }; |
1383 | |
1384 | template<typename _Tp, unsigned _Uint> |
1385 | struct extent<_Tp[], _Uint> |
1386 | : public extent<_Tp, _Uint - 1>::type { }; |
1387 | |
1388 | |
1389 | // Type relations. |
1390 | |
1391 | /// is_same |
1392 | template<typename _Tp, typename _Up> |
1393 | struct is_same |
1394 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
1395 | : public integral_constant<bool, __is_same(_Tp, _Up)> |
1396 | #else |
1397 | : public false_type |
1398 | #endif |
1399 | { }; |
1400 | |
1401 | #ifndef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
1402 | template<typename _Tp> |
1403 | struct is_same<_Tp, _Tp> |
1404 | : public true_type |
1405 | { }; |
1406 | #endif |
1407 | |
1408 | /// is_base_of |
1409 | template<typename _Base, typename _Derived> |
1410 | struct is_base_of |
1411 | : public integral_constant<bool, __is_base_of(_Base, _Derived)> |
1412 | { }; |
1413 | |
1414 | #if __has_builtin(__is_convertible) |
1415 | template<typename _From, typename _To> |
1416 | struct is_convertible |
1417 | : public __bool_constant<__is_convertible(_From, _To)> |
1418 | { }; |
1419 | #else |
1420 | template<typename _From, typename _To, |
1421 | bool = __or_<is_void<_From>, is_function<_To>, |
1422 | is_array<_To>>::value> |
1423 | struct __is_convertible_helper |
1424 | { |
1425 | typedef typename is_void<_To>::type type; |
1426 | }; |
1427 | |
1428 | #pragma GCC diagnostic push |
1429 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" |
1430 | template<typename _From, typename _To> |
1431 | class __is_convertible_helper<_From, _To, false> |
1432 | { |
1433 | template<typename _To1> |
1434 | static void __test_aux(_To1) noexcept; |
1435 | |
1436 | template<typename _From1, typename _To1, |
1437 | typename = decltype(__test_aux<_To1>(std::declval<_From1>()))> |
1438 | static true_type |
1439 | __test(int); |
1440 | |
1441 | template<typename, typename> |
1442 | static false_type |
1443 | __test(...); |
1444 | |
1445 | public: |
1446 | typedef decltype(__test<_From, _To>(0)) type; |
1447 | }; |
1448 | #pragma GCC diagnostic pop |
1449 | |
1450 | /// is_convertible |
1451 | template<typename _From, typename _To> |
1452 | struct is_convertible |
1453 | : public __is_convertible_helper<_From, _To>::type |
1454 | { }; |
1455 | #endif |
1456 | |
1457 | // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N> |
1458 | template<typename _ToElementType, typename _FromElementType> |
1459 | using __is_array_convertible |
1460 | = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>; |
1461 | |
1462 | #if __cplusplus >= 202002L |
1463 | #define __cpp_lib_is_nothrow_convertible 201806L |
1464 | |
1465 | #if __has_builtin(__is_nothrow_convertible) |
1466 | /// is_nothrow_convertible_v |
1467 | template<typename _From, typename _To> |
1468 | inline constexpr bool is_nothrow_convertible_v |
1469 | = __is_nothrow_convertible(_From, _To); |
1470 | |
1471 | /// is_nothrow_convertible |
1472 | template<typename _From, typename _To> |
1473 | struct is_nothrow_convertible |
1474 | : public bool_constant<is_nothrow_convertible_v<_From, _To>> |
1475 | { }; |
1476 | #else |
1477 | template<typename _From, typename _To, |
1478 | bool = __or_<is_void<_From>, is_function<_To>, |
1479 | is_array<_To>>::value> |
1480 | struct __is_nt_convertible_helper |
1481 | : is_void<_To> |
1482 | { }; |
1483 | |
1484 | #pragma GCC diagnostic push |
1485 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" |
1486 | template<typename _From, typename _To> |
1487 | class __is_nt_convertible_helper<_From, _To, false> |
1488 | { |
1489 | template<typename _To1> |
1490 | static void __test_aux(_To1) noexcept; |
1491 | |
1492 | template<typename _From1, typename _To1> |
1493 | static |
1494 | __bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))> |
1495 | __test(int); |
1496 | |
1497 | template<typename, typename> |
1498 | static false_type |
1499 | __test(...); |
1500 | |
1501 | public: |
1502 | using type = decltype(__test<_From, _To>(0)); |
1503 | }; |
1504 | #pragma GCC diagnostic pop |
1505 | |
1506 | /// is_nothrow_convertible |
1507 | template<typename _From, typename _To> |
1508 | struct is_nothrow_convertible |
1509 | : public __is_nt_convertible_helper<_From, _To>::type |
1510 | { }; |
1511 | |
1512 | /// is_nothrow_convertible_v |
1513 | template<typename _From, typename _To> |
1514 | inline constexpr bool is_nothrow_convertible_v |
1515 | = is_nothrow_convertible<_From, _To>::value; |
1516 | #endif |
1517 | #endif // C++2a |
1518 | |
1519 | // Const-volatile modifications. |
1520 | |
1521 | /// remove_const |
1522 | template<typename _Tp> |
1523 | struct remove_const |
1524 | { typedef _Tp type; }; |
1525 | |
1526 | template<typename _Tp> |
1527 | struct remove_const<_Tp const> |
1528 | { typedef _Tp type; }; |
1529 | |
1530 | /// remove_volatile |
1531 | template<typename _Tp> |
1532 | struct remove_volatile |
1533 | { typedef _Tp type; }; |
1534 | |
1535 | template<typename _Tp> |
1536 | struct remove_volatile<_Tp volatile> |
1537 | { typedef _Tp type; }; |
1538 | |
1539 | /// remove_cv |
1540 | #if __has_builtin(__remove_cv) |
1541 | template<typename _Tp> |
1542 | struct remove_cv |
1543 | { using type = __remove_cv(_Tp); }; |
1544 | #else |
1545 | template<typename _Tp> |
1546 | struct remove_cv |
1547 | { using type = _Tp; }; |
1548 | |
1549 | template<typename _Tp> |
1550 | struct remove_cv<const _Tp> |
1551 | { using type = _Tp; }; |
1552 | |
1553 | template<typename _Tp> |
1554 | struct remove_cv<volatile _Tp> |
1555 | { using type = _Tp; }; |
1556 | |
1557 | template<typename _Tp> |
1558 | struct remove_cv<const volatile _Tp> |
1559 | { using type = _Tp; }; |
1560 | #endif |
1561 | |
1562 | /// add_const |
1563 | template<typename _Tp> |
1564 | struct add_const |
1565 | { using type = _Tp const; }; |
1566 | |
1567 | /// add_volatile |
1568 | template<typename _Tp> |
1569 | struct add_volatile |
1570 | { using type = _Tp volatile; }; |
1571 | |
1572 | /// add_cv |
1573 | template<typename _Tp> |
1574 | struct add_cv |
1575 | { using type = _Tp const volatile; }; |
1576 | |
1577 | #if __cplusplus > 201103L |
1578 | |
1579 | #define __cpp_lib_transformation_trait_aliases 201304L |
1580 | |
1581 | /// Alias template for remove_const |
1582 | template<typename _Tp> |
1583 | using remove_const_t = typename remove_const<_Tp>::type; |
1584 | |
1585 | /// Alias template for remove_volatile |
1586 | template<typename _Tp> |
1587 | using remove_volatile_t = typename remove_volatile<_Tp>::type; |
1588 | |
1589 | /// Alias template for remove_cv |
1590 | template<typename _Tp> |
1591 | using remove_cv_t = typename remove_cv<_Tp>::type; |
1592 | |
1593 | /// Alias template for add_const |
1594 | template<typename _Tp> |
1595 | using add_const_t = typename add_const<_Tp>::type; |
1596 | |
1597 | /// Alias template for add_volatile |
1598 | template<typename _Tp> |
1599 | using add_volatile_t = typename add_volatile<_Tp>::type; |
1600 | |
1601 | /// Alias template for add_cv |
1602 | template<typename _Tp> |
1603 | using add_cv_t = typename add_cv<_Tp>::type; |
1604 | #endif |
1605 | |
1606 | // Reference transformations. |
1607 | |
1608 | /// remove_reference |
1609 | #if __has_builtin(__remove_reference) |
1610 | template<typename _Tp> |
1611 | struct remove_reference |
1612 | { using type = __remove_reference(_Tp); }; |
1613 | #else |
1614 | template<typename _Tp> |
1615 | struct remove_reference |
1616 | { using type = _Tp; }; |
1617 | |
1618 | template<typename _Tp> |
1619 | struct remove_reference<_Tp&> |
1620 | { using type = _Tp; }; |
1621 | |
1622 | template<typename _Tp> |
1623 | struct remove_reference<_Tp&&> |
1624 | { using type = _Tp; }; |
1625 | #endif |
1626 | |
1627 | /// add_lvalue_reference |
1628 | template<typename _Tp> |
1629 | struct add_lvalue_reference |
1630 | { using type = __add_lval_ref_t<_Tp>; }; |
1631 | |
1632 | /// add_rvalue_reference |
1633 | template<typename _Tp> |
1634 | struct add_rvalue_reference |
1635 | { using type = __add_rval_ref_t<_Tp>; }; |
1636 | |
1637 | #if __cplusplus > 201103L |
1638 | /// Alias template for remove_reference |
1639 | template<typename _Tp> |
1640 | using remove_reference_t = typename remove_reference<_Tp>::type; |
1641 | |
1642 | /// Alias template for add_lvalue_reference |
1643 | template<typename _Tp> |
1644 | using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; |
1645 | |
1646 | /// Alias template for add_rvalue_reference |
1647 | template<typename _Tp> |
1648 | using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; |
1649 | #endif |
1650 | |
1651 | // Sign modifications. |
1652 | |
1653 | /// @cond undocumented |
1654 | |
1655 | // Utility for constructing identically cv-qualified types. |
1656 | template<typename _Unqualified, bool _IsConst, bool _IsVol> |
1657 | struct __cv_selector; |
1658 | |
1659 | template<typename _Unqualified> |
1660 | struct __cv_selector<_Unqualified, false, false> |
1661 | { typedef _Unqualified __type; }; |
1662 | |
1663 | template<typename _Unqualified> |
1664 | struct __cv_selector<_Unqualified, false, true> |
1665 | { typedef volatile _Unqualified __type; }; |
1666 | |
1667 | template<typename _Unqualified> |
1668 | struct __cv_selector<_Unqualified, true, false> |
1669 | { typedef const _Unqualified __type; }; |
1670 | |
1671 | template<typename _Unqualified> |
1672 | struct __cv_selector<_Unqualified, true, true> |
1673 | { typedef const volatile _Unqualified __type; }; |
1674 | |
1675 | template<typename _Qualified, typename _Unqualified, |
1676 | bool _IsConst = is_const<_Qualified>::value, |
1677 | bool _IsVol = is_volatile<_Qualified>::value> |
1678 | class __match_cv_qualifiers |
1679 | { |
1680 | typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match; |
1681 | |
1682 | public: |
1683 | typedef typename __match::__type __type; |
1684 | }; |
1685 | |
1686 | // Utility for finding the unsigned versions of signed integral types. |
1687 | template<typename _Tp> |
1688 | struct __make_unsigned |
1689 | { typedef _Tp __type; }; |
1690 | |
1691 | template<> |
1692 | struct __make_unsigned<char> |
1693 | { typedef unsigned char __type; }; |
1694 | |
1695 | template<> |
1696 | struct __make_unsigned<signed char> |
1697 | { typedef unsigned char __type; }; |
1698 | |
1699 | template<> |
1700 | struct __make_unsigned<short> |
1701 | { typedef unsigned short __type; }; |
1702 | |
1703 | template<> |
1704 | struct __make_unsigned<int> |
1705 | { typedef unsigned int __type; }; |
1706 | |
1707 | template<> |
1708 | struct __make_unsigned<long> |
1709 | { typedef unsigned long __type; }; |
1710 | |
1711 | template<> |
1712 | struct __make_unsigned<long long> |
1713 | { typedef unsigned long long __type; }; |
1714 | |
1715 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
1716 | __extension__ |
1717 | template<> |
1718 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0> |
1719 | { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; }; |
1720 | #endif |
1721 | #if defined(__GLIBCXX_TYPE_INT_N_1) |
1722 | __extension__ |
1723 | template<> |
1724 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1> |
1725 | { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; }; |
1726 | #endif |
1727 | #if defined(__GLIBCXX_TYPE_INT_N_2) |
1728 | __extension__ |
1729 | template<> |
1730 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2> |
1731 | { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; }; |
1732 | #endif |
1733 | #if defined(__GLIBCXX_TYPE_INT_N_3) |
1734 | __extension__ |
1735 | template<> |
1736 | struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3> |
1737 | { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; }; |
1738 | #endif |
1739 | |
1740 | // Select between integral and enum: not possible to be both. |
1741 | template<typename _Tp, |
1742 | bool _IsInt = is_integral<_Tp>::value, |
1743 | bool _IsEnum = is_enum<_Tp>::value> |
1744 | class __make_unsigned_selector; |
1745 | |
1746 | template<typename _Tp> |
1747 | class __make_unsigned_selector<_Tp, true, false> |
1748 | { |
1749 | using __unsigned_type |
1750 | = typename __make_unsigned<__remove_cv_t<_Tp>>::__type; |
1751 | |
1752 | public: |
1753 | using __type |
1754 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; |
1755 | }; |
1756 | |
1757 | class __make_unsigned_selector_base |
1758 | { |
1759 | protected: |
1760 | template<typename...> struct _List { }; |
1761 | |
1762 | template<typename _Tp, typename... _Up> |
1763 | struct _List<_Tp, _Up...> : _List<_Up...> |
1764 | { static constexpr size_t __size = sizeof(_Tp); }; |
1765 | |
1766 | template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)> |
1767 | struct __select; |
1768 | |
1769 | template<size_t _Sz, typename _Uint, typename... _UInts> |
1770 | struct __select<_Sz, _List<_Uint, _UInts...>, true> |
1771 | { using __type = _Uint; }; |
1772 | |
1773 | template<size_t _Sz, typename _Uint, typename... _UInts> |
1774 | struct __select<_Sz, _List<_Uint, _UInts...>, false> |
1775 | : __select<_Sz, _List<_UInts...>> |
1776 | { }; |
1777 | }; |
1778 | |
1779 | // Choose unsigned integer type with the smallest rank and same size as _Tp |
1780 | template<typename _Tp> |
1781 | class __make_unsigned_selector<_Tp, false, true> |
1782 | : __make_unsigned_selector_base |
1783 | { |
1784 | // With -fshort-enums, an enum may be as small as a char. |
1785 | using _UInts = _List<unsigned char, unsigned short, unsigned int, |
1786 | unsigned long, unsigned long long>; |
1787 | |
1788 | using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type; |
1789 | |
1790 | public: |
1791 | using __type |
1792 | = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type; |
1793 | }; |
1794 | |
1795 | // wchar_t, char8_t, char16_t and char32_t are integral types but are |
1796 | // neither signed integer types nor unsigned integer types, so must be |
1797 | // transformed to the unsigned integer type with the smallest rank. |
1798 | // Use the partial specialization for enumeration types to do that. |
1799 | template<> |
1800 | struct __make_unsigned<wchar_t> |
1801 | { |
1802 | using __type |
1803 | = typename __make_unsigned_selector<wchar_t, false, true>::__type; |
1804 | }; |
1805 | |
1806 | #ifdef _GLIBCXX_USE_CHAR8_T |
1807 | template<> |
1808 | struct __make_unsigned<char8_t> |
1809 | { |
1810 | using __type |
1811 | = typename __make_unsigned_selector<char8_t, false, true>::__type; |
1812 | }; |
1813 | #endif |
1814 | |
1815 | template<> |
1816 | struct __make_unsigned<char16_t> |
1817 | { |
1818 | using __type |
1819 | = typename __make_unsigned_selector<char16_t, false, true>::__type; |
1820 | }; |
1821 | |
1822 | template<> |
1823 | struct __make_unsigned<char32_t> |
1824 | { |
1825 | using __type |
1826 | = typename __make_unsigned_selector<char32_t, false, true>::__type; |
1827 | }; |
1828 | /// @endcond |
1829 | |
1830 | // Given an integral/enum type, return the corresponding unsigned |
1831 | // integer type. |
1832 | // Primary template. |
1833 | /// make_unsigned |
1834 | template<typename _Tp> |
1835 | struct make_unsigned |
1836 | { typedef typename __make_unsigned_selector<_Tp>::__type type; }; |
1837 | |
1838 | // Integral, but don't define. |
1839 | template<> struct make_unsigned<bool>; |
1840 | template<> struct make_unsigned<bool const>; |
1841 | template<> struct make_unsigned<bool volatile>; |
1842 | template<> struct make_unsigned<bool const volatile>; |
1843 | |
1844 | /// @cond undocumented |
1845 | |
1846 | // Utility for finding the signed versions of unsigned integral types. |
1847 | template<typename _Tp> |
1848 | struct __make_signed |
1849 | { typedef _Tp __type; }; |
1850 | |
1851 | template<> |
1852 | struct __make_signed<char> |
1853 | { typedef signed char __type; }; |
1854 | |
1855 | template<> |
1856 | struct __make_signed<unsigned char> |
1857 | { typedef signed char __type; }; |
1858 | |
1859 | template<> |
1860 | struct __make_signed<unsigned short> |
1861 | { typedef signed short __type; }; |
1862 | |
1863 | template<> |
1864 | struct __make_signed<unsigned int> |
1865 | { typedef signed int __type; }; |
1866 | |
1867 | template<> |
1868 | struct __make_signed<unsigned long> |
1869 | { typedef signed long __type; }; |
1870 | |
1871 | template<> |
1872 | struct __make_signed<unsigned long long> |
1873 | { typedef signed long long __type; }; |
1874 | |
1875 | #if defined(__GLIBCXX_TYPE_INT_N_0) |
1876 | __extension__ |
1877 | template<> |
1878 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0> |
1879 | { typedef __GLIBCXX_TYPE_INT_N_0 __type; }; |
1880 | #endif |
1881 | #if defined(__GLIBCXX_TYPE_INT_N_1) |
1882 | __extension__ |
1883 | template<> |
1884 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1> |
1885 | { typedef __GLIBCXX_TYPE_INT_N_1 __type; }; |
1886 | #endif |
1887 | #if defined(__GLIBCXX_TYPE_INT_N_2) |
1888 | __extension__ |
1889 | template<> |
1890 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2> |
1891 | { typedef __GLIBCXX_TYPE_INT_N_2 __type; }; |
1892 | #endif |
1893 | #if defined(__GLIBCXX_TYPE_INT_N_3) |
1894 | __extension__ |
1895 | template<> |
1896 | struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3> |
1897 | { typedef __GLIBCXX_TYPE_INT_N_3 __type; }; |
1898 | #endif |
1899 | |
1900 | // Select between integral and enum: not possible to be both. |
1901 | template<typename _Tp, |
1902 | bool _IsInt = is_integral<_Tp>::value, |
1903 | bool _IsEnum = is_enum<_Tp>::value> |
1904 | class __make_signed_selector; |
1905 | |
1906 | template<typename _Tp> |
1907 | class __make_signed_selector<_Tp, true, false> |
1908 | { |
1909 | using __signed_type |
1910 | = typename __make_signed<__remove_cv_t<_Tp>>::__type; |
1911 | |
1912 | public: |
1913 | using __type |
1914 | = typename __match_cv_qualifiers<_Tp, __signed_type>::__type; |
1915 | }; |
1916 | |
1917 | // Choose signed integer type with the smallest rank and same size as _Tp |
1918 | template<typename _Tp> |
1919 | class __make_signed_selector<_Tp, false, true> |
1920 | { |
1921 | typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type; |
1922 | |
1923 | public: |
1924 | typedef typename __make_signed_selector<__unsigned_type>::__type __type; |
1925 | }; |
1926 | |
1927 | // wchar_t, char16_t and char32_t are integral types but are neither |
1928 | // signed integer types nor unsigned integer types, so must be |
1929 | // transformed to the signed integer type with the smallest rank. |
1930 | // Use the partial specialization for enumeration types to do that. |
1931 | template<> |
1932 | struct __make_signed<wchar_t> |
1933 | { |
1934 | using __type |
1935 | = typename __make_signed_selector<wchar_t, false, true>::__type; |
1936 | }; |
1937 | |
1938 | #if defined(_GLIBCXX_USE_CHAR8_T) |
1939 | template<> |
1940 | struct __make_signed<char8_t> |
1941 | { |
1942 | using __type |
1943 | = typename __make_signed_selector<char8_t, false, true>::__type; |
1944 | }; |
1945 | #endif |
1946 | |
1947 | template<> |
1948 | struct __make_signed<char16_t> |
1949 | { |
1950 | using __type |
1951 | = typename __make_signed_selector<char16_t, false, true>::__type; |
1952 | }; |
1953 | |
1954 | template<> |
1955 | struct __make_signed<char32_t> |
1956 | { |
1957 | using __type |
1958 | = typename __make_signed_selector<char32_t, false, true>::__type; |
1959 | }; |
1960 | /// @endcond |
1961 | |
1962 | // Given an integral/enum type, return the corresponding signed |
1963 | // integer type. |
1964 | // Primary template. |
1965 | /// make_signed |
1966 | template<typename _Tp> |
1967 | struct make_signed |
1968 | { typedef typename __make_signed_selector<_Tp>::__type type; }; |
1969 | |
1970 | // Integral, but don't define. |
1971 | template<> struct make_signed<bool>; |
1972 | template<> struct make_signed<bool const>; |
1973 | template<> struct make_signed<bool volatile>; |
1974 | template<> struct make_signed<bool const volatile>; |
1975 | |
1976 | #if __cplusplus > 201103L |
1977 | /// Alias template for make_signed |
1978 | template<typename _Tp> |
1979 | using make_signed_t = typename make_signed<_Tp>::type; |
1980 | |
1981 | /// Alias template for make_unsigned |
1982 | template<typename _Tp> |
1983 | using make_unsigned_t = typename make_unsigned<_Tp>::type; |
1984 | #endif |
1985 | |
1986 | // Array modifications. |
1987 | |
1988 | /// remove_extent |
1989 | template<typename _Tp> |
1990 | struct remove_extent |
1991 | { typedef _Tp type; }; |
1992 | |
1993 | template<typename _Tp, std::size_t _Size> |
1994 | struct remove_extent<_Tp[_Size]> |
1995 | { typedef _Tp type; }; |
1996 | |
1997 | template<typename _Tp> |
1998 | struct remove_extent<_Tp[]> |
1999 | { typedef _Tp type; }; |
2000 | |
2001 | /// remove_all_extents |
2002 | template<typename _Tp> |
2003 | struct remove_all_extents |
2004 | { typedef _Tp type; }; |
2005 | |
2006 | template<typename _Tp, std::size_t _Size> |
2007 | struct remove_all_extents<_Tp[_Size]> |
2008 | { typedef typename remove_all_extents<_Tp>::type type; }; |
2009 | |
2010 | template<typename _Tp> |
2011 | struct remove_all_extents<_Tp[]> |
2012 | { typedef typename remove_all_extents<_Tp>::type type; }; |
2013 | |
2014 | #if __cplusplus > 201103L |
2015 | /// Alias template for remove_extent |
2016 | template<typename _Tp> |
2017 | using remove_extent_t = typename remove_extent<_Tp>::type; |
2018 | |
2019 | /// Alias template for remove_all_extents |
2020 | template<typename _Tp> |
2021 | using remove_all_extents_t = typename remove_all_extents<_Tp>::type; |
2022 | #endif |
2023 | |
2024 | // Pointer modifications. |
2025 | |
2026 | template<typename _Tp, typename> |
2027 | struct __remove_pointer_helper |
2028 | { typedef _Tp type; }; |
2029 | |
2030 | template<typename _Tp, typename _Up> |
2031 | struct __remove_pointer_helper<_Tp, _Up*> |
2032 | { typedef _Up type; }; |
2033 | |
2034 | /// remove_pointer |
2035 | template<typename _Tp> |
2036 | struct remove_pointer |
2037 | : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>> |
2038 | { }; |
2039 | |
2040 | template<typename _Tp, typename = void> |
2041 | struct __add_pointer_helper |
2042 | { using type = _Tp; }; |
2043 | |
2044 | template<typename _Tp> |
2045 | struct __add_pointer_helper<_Tp, __void_t<_Tp*>> |
2046 | { using type = _Tp*; }; |
2047 | |
2048 | /// add_pointer |
2049 | template<typename _Tp> |
2050 | struct add_pointer |
2051 | : public __add_pointer_helper<_Tp> |
2052 | { }; |
2053 | |
2054 | template<typename _Tp> |
2055 | struct add_pointer<_Tp&> |
2056 | { using type = _Tp*; }; |
2057 | |
2058 | template<typename _Tp> |
2059 | struct add_pointer<_Tp&&> |
2060 | { using type = _Tp*; }; |
2061 | |
2062 | #if __cplusplus > 201103L |
2063 | /// Alias template for remove_pointer |
2064 | template<typename _Tp> |
2065 | using remove_pointer_t = typename remove_pointer<_Tp>::type; |
2066 | |
2067 | /// Alias template for add_pointer |
2068 | template<typename _Tp> |
2069 | using add_pointer_t = typename add_pointer<_Tp>::type; |
2070 | #endif |
2071 | |
2072 | template<std::size_t _Len> |
2073 | struct __aligned_storage_msa |
2074 | { |
2075 | union __type |
2076 | { |
2077 | unsigned char __data[_Len]; |
2078 | struct __attribute__((__aligned__)) { } __align; |
2079 | }; |
2080 | }; |
2081 | |
2082 | /** |
2083 | * @brief Alignment type. |
2084 | * |
2085 | * The value of _Align is a default-alignment which shall be the |
2086 | * most stringent alignment requirement for any C++ object type |
2087 | * whose size is no greater than _Len (3.9). The member typedef |
2088 | * type shall be a POD type suitable for use as uninitialized |
2089 | * storage for any object whose size is at most _Len and whose |
2090 | * alignment is a divisor of _Align. |
2091 | * |
2092 | * @deprecated Deprecated in C++23. Uses can be replaced by an |
2093 | * array std::byte[_Len] declared with alignas(_Align). |
2094 | */ |
2095 | template<std::size_t _Len, std::size_t _Align = |
2096 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> |
2097 | struct |
2098 | _GLIBCXX23_DEPRECATED |
2099 | aligned_storage |
2100 | { |
2101 | union type |
2102 | { |
2103 | unsigned char __data[_Len]; |
2104 | struct __attribute__((__aligned__((_Align)))) { } __align; |
2105 | }; |
2106 | }; |
2107 | |
2108 | template <typename... _Types> |
2109 | struct __strictest_alignment |
2110 | { |
2111 | static const size_t _S_alignment = 0; |
2112 | static const size_t _S_size = 0; |
2113 | }; |
2114 | |
2115 | template <typename _Tp, typename... _Types> |
2116 | struct __strictest_alignment<_Tp, _Types...> |
2117 | { |
2118 | static const size_t _S_alignment = |
2119 | alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment |
2120 | ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment; |
2121 | static const size_t _S_size = |
2122 | sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size |
2123 | ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size; |
2124 | }; |
2125 | |
2126 | #pragma GCC diagnostic push |
2127 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" |
2128 | |
2129 | /** |
2130 | * @brief Provide aligned storage for types. |
2131 | * |
2132 | * [meta.trans.other] |
2133 | * |
2134 | * Provides aligned storage for any of the provided types of at |
2135 | * least size _Len. |
2136 | * |
2137 | * @see aligned_storage |
2138 | * |
2139 | * @deprecated Deprecated in C++23. |
2140 | */ |
2141 | template <size_t _Len, typename... _Types> |
2142 | struct |
2143 | _GLIBCXX23_DEPRECATED |
2144 | aligned_union |
2145 | { |
2146 | private: |
2147 | static_assert(sizeof...(_Types) != 0, "At least one type is required" ); |
2148 | |
2149 | using __strictest = __strictest_alignment<_Types...>; |
2150 | static const size_t _S_len = _Len > __strictest::_S_size |
2151 | ? _Len : __strictest::_S_size; |
2152 | public: |
2153 | /// The value of the strictest alignment of _Types. |
2154 | static const size_t alignment_value = __strictest::_S_alignment; |
2155 | /// The storage. |
2156 | typedef typename aligned_storage<_S_len, alignment_value>::type type; |
2157 | }; |
2158 | |
2159 | template <size_t _Len, typename... _Types> |
2160 | const size_t aligned_union<_Len, _Types...>::alignment_value; |
2161 | #pragma GCC diagnostic pop |
2162 | |
2163 | /// @cond undocumented |
2164 | |
2165 | // Decay trait for arrays and functions, used for perfect forwarding |
2166 | // in make_pair, make_tuple, etc. |
2167 | template<typename _Up> |
2168 | struct __decay_selector |
2169 | : __conditional_t<is_const<const _Up>::value, // false for functions |
2170 | remove_cv<_Up>, // N.B. DR 705. |
2171 | add_pointer<_Up>> // function decays to pointer |
2172 | { }; |
2173 | |
2174 | template<typename _Up, size_t _Nm> |
2175 | struct __decay_selector<_Up[_Nm]> |
2176 | { using type = _Up*; }; |
2177 | |
2178 | template<typename _Up> |
2179 | struct __decay_selector<_Up[]> |
2180 | { using type = _Up*; }; |
2181 | |
2182 | /// @endcond |
2183 | |
2184 | /// decay |
2185 | template<typename _Tp> |
2186 | struct decay |
2187 | { using type = typename __decay_selector<_Tp>::type; }; |
2188 | |
2189 | template<typename _Tp> |
2190 | struct decay<_Tp&> |
2191 | { using type = typename __decay_selector<_Tp>::type; }; |
2192 | |
2193 | template<typename _Tp> |
2194 | struct decay<_Tp&&> |
2195 | { using type = typename __decay_selector<_Tp>::type; }; |
2196 | |
2197 | /// @cond undocumented |
2198 | |
2199 | // Helper which adds a reference to a type when given a reference_wrapper |
2200 | template<typename _Tp> |
2201 | struct __strip_reference_wrapper |
2202 | { |
2203 | typedef _Tp __type; |
2204 | }; |
2205 | |
2206 | template<typename _Tp> |
2207 | struct __strip_reference_wrapper<reference_wrapper<_Tp> > |
2208 | { |
2209 | typedef _Tp& __type; |
2210 | }; |
2211 | |
2212 | // __decay_t (std::decay_t for C++11). |
2213 | template<typename _Tp> |
2214 | using __decay_t = typename decay<_Tp>::type; |
2215 | |
2216 | template<typename _Tp> |
2217 | using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>; |
2218 | /// @endcond |
2219 | |
2220 | /// @cond undocumented |
2221 | |
2222 | // Helper for SFINAE constraints |
2223 | template<typename... _Cond> |
2224 | using _Require = __enable_if_t<__and_<_Cond...>::value>; |
2225 | |
2226 | // __remove_cvref_t (std::remove_cvref_t for C++11). |
2227 | template<typename _Tp> |
2228 | using __remove_cvref_t |
2229 | = typename remove_cv<typename remove_reference<_Tp>::type>::type; |
2230 | /// @endcond |
2231 | |
2232 | // Primary template. |
2233 | /// Define a member typedef @c type to one of two argument types. |
2234 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2235 | struct conditional |
2236 | { typedef _Iftrue type; }; |
2237 | |
2238 | // Partial specialization for false. |
2239 | template<typename _Iftrue, typename _Iffalse> |
2240 | struct conditional<false, _Iftrue, _Iffalse> |
2241 | { typedef _Iffalse type; }; |
2242 | |
2243 | /// common_type |
2244 | template<typename... _Tp> |
2245 | struct common_type; |
2246 | |
2247 | // Sfinae-friendly common_type implementation: |
2248 | |
2249 | /// @cond undocumented |
2250 | |
2251 | // For several sfinae-friendly trait implementations we transport both the |
2252 | // result information (as the member type) and the failure information (no |
2253 | // member type). This is very similar to std::enable_if, but we cannot use |
2254 | // that, because we need to derive from them as an implementation detail. |
2255 | |
2256 | template<typename _Tp> |
2257 | struct __success_type |
2258 | { typedef _Tp type; }; |
2259 | |
2260 | struct __failure_type |
2261 | { }; |
2262 | |
2263 | struct __do_common_type_impl |
2264 | { |
2265 | template<typename _Tp, typename _Up> |
2266 | using __cond_t |
2267 | = decltype(true ? std::declval<_Tp>() : std::declval<_Up>()); |
2268 | |
2269 | // if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2270 | // denotes a valid type, let C denote that type. |
2271 | template<typename _Tp, typename _Up> |
2272 | static __success_type<__decay_t<__cond_t<_Tp, _Up>>> |
2273 | _S_test(int); |
2274 | |
2275 | #if __cplusplus > 201703L |
2276 | // Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type, |
2277 | // let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>. |
2278 | template<typename _Tp, typename _Up> |
2279 | static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>> |
2280 | _S_test_2(int); |
2281 | #endif |
2282 | |
2283 | template<typename, typename> |
2284 | static __failure_type |
2285 | _S_test_2(...); |
2286 | |
2287 | template<typename _Tp, typename _Up> |
2288 | static decltype(_S_test_2<_Tp, _Up>(0)) |
2289 | _S_test(...); |
2290 | }; |
2291 | |
2292 | // If sizeof...(T) is zero, there shall be no member type. |
2293 | template<> |
2294 | struct common_type<> |
2295 | { }; |
2296 | |
2297 | // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>. |
2298 | template<typename _Tp0> |
2299 | struct common_type<_Tp0> |
2300 | : public common_type<_Tp0, _Tp0> |
2301 | { }; |
2302 | |
2303 | // If sizeof...(T) is two, ... |
2304 | template<typename _Tp1, typename _Tp2, |
2305 | typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>> |
2306 | struct __common_type_impl |
2307 | { |
2308 | // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false, |
2309 | // let C denote the same type, if any, as common_type_t<D1, D2>. |
2310 | using type = common_type<_Dp1, _Dp2>; |
2311 | }; |
2312 | |
2313 | template<typename _Tp1, typename _Tp2> |
2314 | struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2> |
2315 | : private __do_common_type_impl |
2316 | { |
2317 | // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())> |
2318 | // denotes a valid type, let C denote that type. |
2319 | using type = decltype(_S_test<_Tp1, _Tp2>(0)); |
2320 | }; |
2321 | |
2322 | // If sizeof...(T) is two, ... |
2323 | template<typename _Tp1, typename _Tp2> |
2324 | struct common_type<_Tp1, _Tp2> |
2325 | : public __common_type_impl<_Tp1, _Tp2>::type |
2326 | { }; |
2327 | |
2328 | template<typename...> |
2329 | struct __common_type_pack |
2330 | { }; |
2331 | |
2332 | template<typename, typename, typename = void> |
2333 | struct __common_type_fold; |
2334 | |
2335 | // If sizeof...(T) is greater than two, ... |
2336 | template<typename _Tp1, typename _Tp2, typename... _Rp> |
2337 | struct common_type<_Tp1, _Tp2, _Rp...> |
2338 | : public __common_type_fold<common_type<_Tp1, _Tp2>, |
2339 | __common_type_pack<_Rp...>> |
2340 | { }; |
2341 | |
2342 | // Let C denote the same type, if any, as common_type_t<T1, T2>. |
2343 | // If there is such a type C, type shall denote the same type, if any, |
2344 | // as common_type_t<C, R...>. |
2345 | template<typename _CTp, typename... _Rp> |
2346 | struct __common_type_fold<_CTp, __common_type_pack<_Rp...>, |
2347 | __void_t<typename _CTp::type>> |
2348 | : public common_type<typename _CTp::type, _Rp...> |
2349 | { }; |
2350 | |
2351 | // Otherwise, there shall be no member type. |
2352 | template<typename _CTp, typename _Rp> |
2353 | struct __common_type_fold<_CTp, _Rp, void> |
2354 | { }; |
2355 | |
2356 | template<typename _Tp, bool = is_enum<_Tp>::value> |
2357 | struct __underlying_type_impl |
2358 | { |
2359 | using type = __underlying_type(_Tp); |
2360 | }; |
2361 | |
2362 | template<typename _Tp> |
2363 | struct __underlying_type_impl<_Tp, false> |
2364 | { }; |
2365 | /// @endcond |
2366 | |
2367 | /// The underlying type of an enum. |
2368 | template<typename _Tp> |
2369 | struct underlying_type |
2370 | : public __underlying_type_impl<_Tp> |
2371 | { }; |
2372 | |
2373 | /// @cond undocumented |
2374 | template<typename _Tp> |
2375 | struct __declval_protector |
2376 | { |
2377 | static const bool __stop = false; |
2378 | }; |
2379 | /// @endcond |
2380 | |
2381 | /** Utility to simplify expressions used in unevaluated operands |
2382 | * @since C++11 |
2383 | * @ingroup utilities |
2384 | */ |
2385 | template<typename _Tp> |
2386 | auto declval() noexcept -> decltype(__declval<_Tp>(0)) |
2387 | { |
2388 | static_assert(__declval_protector<_Tp>::__stop, |
2389 | "declval() must not be used!" ); |
2390 | return __declval<_Tp>(0); |
2391 | } |
2392 | |
2393 | /// result_of |
2394 | template<typename _Signature> |
2395 | struct result_of; |
2396 | |
2397 | // Sfinae-friendly result_of implementation: |
2398 | |
2399 | #define __cpp_lib_result_of_sfinae 201210L |
2400 | |
2401 | /// @cond undocumented |
2402 | struct __invoke_memfun_ref { }; |
2403 | struct __invoke_memfun_deref { }; |
2404 | struct __invoke_memobj_ref { }; |
2405 | struct __invoke_memobj_deref { }; |
2406 | struct __invoke_other { }; |
2407 | |
2408 | // Associate a tag type with a specialization of __success_type. |
2409 | template<typename _Tp, typename _Tag> |
2410 | struct __result_of_success : __success_type<_Tp> |
2411 | { using __invoke_type = _Tag; }; |
2412 | |
2413 | // [func.require] paragraph 1 bullet 1: |
2414 | struct __result_of_memfun_ref_impl |
2415 | { |
2416 | template<typename _Fp, typename _Tp1, typename... _Args> |
2417 | static __result_of_success<decltype( |
2418 | (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
2419 | ), __invoke_memfun_ref> _S_test(int); |
2420 | |
2421 | template<typename...> |
2422 | static __failure_type _S_test(...); |
2423 | }; |
2424 | |
2425 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2426 | struct __result_of_memfun_ref |
2427 | : private __result_of_memfun_ref_impl |
2428 | { |
2429 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; |
2430 | }; |
2431 | |
2432 | // [func.require] paragraph 1 bullet 2: |
2433 | struct __result_of_memfun_deref_impl |
2434 | { |
2435 | template<typename _Fp, typename _Tp1, typename... _Args> |
2436 | static __result_of_success<decltype( |
2437 | ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
2438 | ), __invoke_memfun_deref> _S_test(int); |
2439 | |
2440 | template<typename...> |
2441 | static __failure_type _S_test(...); |
2442 | }; |
2443 | |
2444 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2445 | struct __result_of_memfun_deref |
2446 | : private __result_of_memfun_deref_impl |
2447 | { |
2448 | typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; |
2449 | }; |
2450 | |
2451 | // [func.require] paragraph 1 bullet 3: |
2452 | struct __result_of_memobj_ref_impl |
2453 | { |
2454 | template<typename _Fp, typename _Tp1> |
2455 | static __result_of_success<decltype( |
2456 | std::declval<_Tp1>().*std::declval<_Fp>() |
2457 | ), __invoke_memobj_ref> _S_test(int); |
2458 | |
2459 | template<typename, typename> |
2460 | static __failure_type _S_test(...); |
2461 | }; |
2462 | |
2463 | template<typename _MemPtr, typename _Arg> |
2464 | struct __result_of_memobj_ref |
2465 | : private __result_of_memobj_ref_impl |
2466 | { |
2467 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; |
2468 | }; |
2469 | |
2470 | // [func.require] paragraph 1 bullet 4: |
2471 | struct __result_of_memobj_deref_impl |
2472 | { |
2473 | template<typename _Fp, typename _Tp1> |
2474 | static __result_of_success<decltype( |
2475 | (*std::declval<_Tp1>()).*std::declval<_Fp>() |
2476 | ), __invoke_memobj_deref> _S_test(int); |
2477 | |
2478 | template<typename, typename> |
2479 | static __failure_type _S_test(...); |
2480 | }; |
2481 | |
2482 | template<typename _MemPtr, typename _Arg> |
2483 | struct __result_of_memobj_deref |
2484 | : private __result_of_memobj_deref_impl |
2485 | { |
2486 | typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; |
2487 | }; |
2488 | |
2489 | template<typename _MemPtr, typename _Arg> |
2490 | struct __result_of_memobj; |
2491 | |
2492 | template<typename _Res, typename _Class, typename _Arg> |
2493 | struct __result_of_memobj<_Res _Class::*, _Arg> |
2494 | { |
2495 | typedef __remove_cvref_t<_Arg> _Argval; |
2496 | typedef _Res _Class::* _MemPtr; |
2497 | typedef typename __conditional_t<__or_<is_same<_Argval, _Class>, |
2498 | is_base_of<_Class, _Argval>>::value, |
2499 | __result_of_memobj_ref<_MemPtr, _Arg>, |
2500 | __result_of_memobj_deref<_MemPtr, _Arg> |
2501 | >::type type; |
2502 | }; |
2503 | |
2504 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2505 | struct __result_of_memfun; |
2506 | |
2507 | template<typename _Res, typename _Class, typename _Arg, typename... _Args> |
2508 | struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
2509 | { |
2510 | typedef typename remove_reference<_Arg>::type _Argval; |
2511 | typedef _Res _Class::* _MemPtr; |
2512 | typedef typename __conditional_t<is_base_of<_Class, _Argval>::value, |
2513 | __result_of_memfun_ref<_MemPtr, _Arg, _Args...>, |
2514 | __result_of_memfun_deref<_MemPtr, _Arg, _Args...> |
2515 | >::type type; |
2516 | }; |
2517 | |
2518 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
2519 | // 2219. INVOKE-ing a pointer to member with a reference_wrapper |
2520 | // as the object expression |
2521 | |
2522 | // Used by result_of, invoke etc. to unwrap a reference_wrapper. |
2523 | template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>> |
2524 | struct __inv_unwrap |
2525 | { |
2526 | using type = _Tp; |
2527 | }; |
2528 | |
2529 | template<typename _Tp, typename _Up> |
2530 | struct __inv_unwrap<_Tp, reference_wrapper<_Up>> |
2531 | { |
2532 | using type = _Up&; |
2533 | }; |
2534 | |
2535 | template<bool, bool, typename _Functor, typename... _ArgTypes> |
2536 | struct __result_of_impl |
2537 | { |
2538 | typedef __failure_type type; |
2539 | }; |
2540 | |
2541 | template<typename _MemPtr, typename _Arg> |
2542 | struct __result_of_impl<true, false, _MemPtr, _Arg> |
2543 | : public __result_of_memobj<__decay_t<_MemPtr>, |
2544 | typename __inv_unwrap<_Arg>::type> |
2545 | { }; |
2546 | |
2547 | template<typename _MemPtr, typename _Arg, typename... _Args> |
2548 | struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> |
2549 | : public __result_of_memfun<__decay_t<_MemPtr>, |
2550 | typename __inv_unwrap<_Arg>::type, _Args...> |
2551 | { }; |
2552 | |
2553 | // [func.require] paragraph 1 bullet 5: |
2554 | struct __result_of_other_impl |
2555 | { |
2556 | template<typename _Fn, typename... _Args> |
2557 | static __result_of_success<decltype( |
2558 | std::declval<_Fn>()(std::declval<_Args>()...) |
2559 | ), __invoke_other> _S_test(int); |
2560 | |
2561 | template<typename...> |
2562 | static __failure_type _S_test(...); |
2563 | }; |
2564 | |
2565 | template<typename _Functor, typename... _ArgTypes> |
2566 | struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
2567 | : private __result_of_other_impl |
2568 | { |
2569 | typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
2570 | }; |
2571 | |
2572 | // __invoke_result (std::invoke_result for C++11) |
2573 | template<typename _Functor, typename... _ArgTypes> |
2574 | struct __invoke_result |
2575 | : public __result_of_impl< |
2576 | is_member_object_pointer< |
2577 | typename remove_reference<_Functor>::type |
2578 | >::value, |
2579 | is_member_function_pointer< |
2580 | typename remove_reference<_Functor>::type |
2581 | >::value, |
2582 | _Functor, _ArgTypes... |
2583 | >::type |
2584 | { }; |
2585 | /// @endcond |
2586 | |
2587 | template<typename _Functor, typename... _ArgTypes> |
2588 | struct result_of<_Functor(_ArgTypes...)> |
2589 | : public __invoke_result<_Functor, _ArgTypes...> |
2590 | { } _GLIBCXX17_DEPRECATED_SUGGEST("std::invoke_result" ); |
2591 | |
2592 | #if __cplusplus >= 201402L |
2593 | #pragma GCC diagnostic push |
2594 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" |
2595 | /// Alias template for aligned_storage |
2596 | template<size_t _Len, size_t _Align = |
2597 | __alignof__(typename __aligned_storage_msa<_Len>::__type)> |
2598 | using aligned_storage_t _GLIBCXX23_DEPRECATED = typename aligned_storage<_Len, _Align>::type; |
2599 | |
2600 | template <size_t _Len, typename... _Types> |
2601 | using aligned_union_t _GLIBCXX23_DEPRECATED = typename aligned_union<_Len, _Types...>::type; |
2602 | #pragma GCC diagnostic pop |
2603 | |
2604 | /// Alias template for decay |
2605 | template<typename _Tp> |
2606 | using decay_t = typename decay<_Tp>::type; |
2607 | |
2608 | /// Alias template for enable_if |
2609 | template<bool _Cond, typename _Tp = void> |
2610 | using enable_if_t = typename enable_if<_Cond, _Tp>::type; |
2611 | |
2612 | /// Alias template for conditional |
2613 | template<bool _Cond, typename _Iftrue, typename _Iffalse> |
2614 | using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type; |
2615 | |
2616 | /// Alias template for common_type |
2617 | template<typename... _Tp> |
2618 | using common_type_t = typename common_type<_Tp...>::type; |
2619 | |
2620 | /// Alias template for underlying_type |
2621 | template<typename _Tp> |
2622 | using underlying_type_t = typename underlying_type<_Tp>::type; |
2623 | |
2624 | /// Alias template for result_of |
2625 | template<typename _Tp> |
2626 | using result_of_t = typename result_of<_Tp>::type; |
2627 | #endif // C++14 |
2628 | |
2629 | #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11 |
2630 | #define __cpp_lib_void_t 201411L |
2631 | /// A metafunction that always yields void, used for detecting valid types. |
2632 | template<typename...> using void_t = void; |
2633 | #endif |
2634 | |
2635 | /// @cond undocumented |
2636 | |
2637 | // Detection idiom. |
2638 | // Detect whether _Op<_Args...> is a valid type, use default _Def if not. |
2639 | |
2640 | #if __cpp_concepts |
2641 | // Implementation of the detection idiom (negative case). |
2642 | template<typename _Def, template<typename...> class _Op, typename... _Args> |
2643 | struct __detected_or |
2644 | { |
2645 | using type = _Def; |
2646 | using __is_detected = false_type; |
2647 | }; |
2648 | |
2649 | // Implementation of the detection idiom (positive case). |
2650 | template<typename _Def, template<typename...> class _Op, typename... _Args> |
2651 | requires requires { typename _Op<_Args...>; } |
2652 | struct __detected_or<_Def, _Op, _Args...> |
2653 | { |
2654 | using type = _Op<_Args...>; |
2655 | using __is_detected = true_type; |
2656 | }; |
2657 | #else |
2658 | /// Implementation of the detection idiom (negative case). |
2659 | template<typename _Default, typename _AlwaysVoid, |
2660 | template<typename...> class _Op, typename... _Args> |
2661 | struct __detector |
2662 | { |
2663 | using type = _Default; |
2664 | using __is_detected = false_type; |
2665 | }; |
2666 | |
2667 | /// Implementation of the detection idiom (positive case). |
2668 | template<typename _Default, template<typename...> class _Op, |
2669 | typename... _Args> |
2670 | struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...> |
2671 | { |
2672 | using type = _Op<_Args...>; |
2673 | using __is_detected = true_type; |
2674 | }; |
2675 | |
2676 | template<typename _Default, template<typename...> class _Op, |
2677 | typename... _Args> |
2678 | using __detected_or = __detector<_Default, void, _Op, _Args...>; |
2679 | #endif // __cpp_concepts |
2680 | |
2681 | // _Op<_Args...> if that is a valid type, otherwise _Default. |
2682 | template<typename _Default, template<typename...> class _Op, |
2683 | typename... _Args> |
2684 | using __detected_or_t |
2685 | = typename __detected_or<_Default, _Op, _Args...>::type; |
2686 | |
2687 | /** |
2688 | * Use SFINAE to determine if the type _Tp has a publicly-accessible |
2689 | * member type _NTYPE. |
2690 | */ |
2691 | #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \ |
2692 | template<typename _Tp, typename = __void_t<>> \ |
2693 | struct __has_##_NTYPE \ |
2694 | : false_type \ |
2695 | { }; \ |
2696 | template<typename _Tp> \ |
2697 | struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \ |
2698 | : true_type \ |
2699 | { }; |
2700 | |
2701 | template <typename _Tp> |
2702 | struct __is_swappable; |
2703 | |
2704 | template <typename _Tp> |
2705 | struct __is_nothrow_swappable; |
2706 | |
2707 | template<typename> |
2708 | struct __is_tuple_like_impl : false_type |
2709 | { }; |
2710 | |
2711 | // Internal type trait that allows us to sfinae-protect tuple_cat. |
2712 | template<typename _Tp> |
2713 | struct __is_tuple_like |
2714 | : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type |
2715 | { }; |
2716 | /// @endcond |
2717 | |
2718 | template<typename _Tp> |
2719 | _GLIBCXX20_CONSTEXPR |
2720 | inline |
2721 | _Require<__not_<__is_tuple_like<_Tp>>, |
2722 | is_move_constructible<_Tp>, |
2723 | is_move_assignable<_Tp>> |
2724 | swap(_Tp&, _Tp&) |
2725 | noexcept(__and_<is_nothrow_move_constructible<_Tp>, |
2726 | is_nothrow_move_assignable<_Tp>>::value); |
2727 | |
2728 | template<typename _Tp, size_t _Nm> |
2729 | _GLIBCXX20_CONSTEXPR |
2730 | inline |
2731 | __enable_if_t<__is_swappable<_Tp>::value> |
2732 | swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm]) |
2733 | noexcept(__is_nothrow_swappable<_Tp>::value); |
2734 | |
2735 | /// @cond undocumented |
2736 | namespace __swappable_details { |
2737 | using std::swap; |
2738 | |
2739 | struct __do_is_swappable_impl |
2740 | { |
2741 | template<typename _Tp, typename |
2742 | = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))> |
2743 | static true_type __test(int); |
2744 | |
2745 | template<typename> |
2746 | static false_type __test(...); |
2747 | }; |
2748 | |
2749 | struct __do_is_nothrow_swappable_impl |
2750 | { |
2751 | template<typename _Tp> |
2752 | static __bool_constant< |
2753 | noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>())) |
2754 | > __test(int); |
2755 | |
2756 | template<typename> |
2757 | static false_type __test(...); |
2758 | }; |
2759 | |
2760 | } // namespace __swappable_details |
2761 | |
2762 | template<typename _Tp> |
2763 | struct __is_swappable_impl |
2764 | : public __swappable_details::__do_is_swappable_impl |
2765 | { |
2766 | typedef decltype(__test<_Tp>(0)) type; |
2767 | }; |
2768 | |
2769 | template<typename _Tp> |
2770 | struct __is_nothrow_swappable_impl |
2771 | : public __swappable_details::__do_is_nothrow_swappable_impl |
2772 | { |
2773 | typedef decltype(__test<_Tp>(0)) type; |
2774 | }; |
2775 | |
2776 | template<typename _Tp> |
2777 | struct __is_swappable |
2778 | : public __is_swappable_impl<_Tp>::type |
2779 | { }; |
2780 | |
2781 | template<typename _Tp> |
2782 | struct __is_nothrow_swappable |
2783 | : public __is_nothrow_swappable_impl<_Tp>::type |
2784 | { }; |
2785 | /// @endcond |
2786 | |
2787 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
2788 | #define __cpp_lib_is_swappable 201603L |
2789 | /// Metafunctions used for detecting swappable types: p0185r1 |
2790 | |
2791 | /// is_swappable |
2792 | template<typename _Tp> |
2793 | struct is_swappable |
2794 | : public __is_swappable_impl<_Tp>::type |
2795 | { |
2796 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
2797 | "template argument must be a complete class or an unbounded array" ); |
2798 | }; |
2799 | |
2800 | /// is_nothrow_swappable |
2801 | template<typename _Tp> |
2802 | struct is_nothrow_swappable |
2803 | : public __is_nothrow_swappable_impl<_Tp>::type |
2804 | { |
2805 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
2806 | "template argument must be a complete class or an unbounded array" ); |
2807 | }; |
2808 | |
2809 | #if __cplusplus >= 201402L |
2810 | /// is_swappable_v |
2811 | template<typename _Tp> |
2812 | _GLIBCXX17_INLINE constexpr bool is_swappable_v = |
2813 | is_swappable<_Tp>::value; |
2814 | |
2815 | /// is_nothrow_swappable_v |
2816 | template<typename _Tp> |
2817 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v = |
2818 | is_nothrow_swappable<_Tp>::value; |
2819 | #endif // __cplusplus >= 201402L |
2820 | |
2821 | /// @cond undocumented |
2822 | namespace __swappable_with_details { |
2823 | using std::swap; |
2824 | |
2825 | struct __do_is_swappable_with_impl |
2826 | { |
2827 | template<typename _Tp, typename _Up, typename |
2828 | = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())), |
2829 | typename |
2830 | = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))> |
2831 | static true_type __test(int); |
2832 | |
2833 | template<typename, typename> |
2834 | static false_type __test(...); |
2835 | }; |
2836 | |
2837 | struct __do_is_nothrow_swappable_with_impl |
2838 | { |
2839 | template<typename _Tp, typename _Up> |
2840 | static __bool_constant< |
2841 | noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())) |
2842 | && |
2843 | noexcept(swap(std::declval<_Up>(), std::declval<_Tp>())) |
2844 | > __test(int); |
2845 | |
2846 | template<typename, typename> |
2847 | static false_type __test(...); |
2848 | }; |
2849 | |
2850 | } // namespace __swappable_with_details |
2851 | |
2852 | template<typename _Tp, typename _Up> |
2853 | struct __is_swappable_with_impl |
2854 | : public __swappable_with_details::__do_is_swappable_with_impl |
2855 | { |
2856 | typedef decltype(__test<_Tp, _Up>(0)) type; |
2857 | }; |
2858 | |
2859 | // Optimization for the homogenous lvalue case, not required: |
2860 | template<typename _Tp> |
2861 | struct __is_swappable_with_impl<_Tp&, _Tp&> |
2862 | : public __swappable_details::__do_is_swappable_impl |
2863 | { |
2864 | typedef decltype(__test<_Tp&>(0)) type; |
2865 | }; |
2866 | |
2867 | template<typename _Tp, typename _Up> |
2868 | struct __is_nothrow_swappable_with_impl |
2869 | : public __swappable_with_details::__do_is_nothrow_swappable_with_impl |
2870 | { |
2871 | typedef decltype(__test<_Tp, _Up>(0)) type; |
2872 | }; |
2873 | |
2874 | // Optimization for the homogenous lvalue case, not required: |
2875 | template<typename _Tp> |
2876 | struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&> |
2877 | : public __swappable_details::__do_is_nothrow_swappable_impl |
2878 | { |
2879 | typedef decltype(__test<_Tp&>(0)) type; |
2880 | }; |
2881 | /// @endcond |
2882 | |
2883 | /// is_swappable_with |
2884 | template<typename _Tp, typename _Up> |
2885 | struct is_swappable_with |
2886 | : public __is_swappable_with_impl<_Tp, _Up>::type |
2887 | { |
2888 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
2889 | "first template argument must be a complete class or an unbounded array" ); |
2890 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), |
2891 | "second template argument must be a complete class or an unbounded array" ); |
2892 | }; |
2893 | |
2894 | /// is_nothrow_swappable_with |
2895 | template<typename _Tp, typename _Up> |
2896 | struct is_nothrow_swappable_with |
2897 | : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type |
2898 | { |
2899 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
2900 | "first template argument must be a complete class or an unbounded array" ); |
2901 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Up>{}), |
2902 | "second template argument must be a complete class or an unbounded array" ); |
2903 | }; |
2904 | |
2905 | #if __cplusplus >= 201402L |
2906 | /// is_swappable_with_v |
2907 | template<typename _Tp, typename _Up> |
2908 | _GLIBCXX17_INLINE constexpr bool is_swappable_with_v = |
2909 | is_swappable_with<_Tp, _Up>::value; |
2910 | |
2911 | /// is_nothrow_swappable_with_v |
2912 | template<typename _Tp, typename _Up> |
2913 | _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v = |
2914 | is_nothrow_swappable_with<_Tp, _Up>::value; |
2915 | #endif // __cplusplus >= 201402L |
2916 | |
2917 | #endif// c++1z or gnu++11 |
2918 | |
2919 | /// @cond undocumented |
2920 | |
2921 | // __is_invocable (std::is_invocable for C++11) |
2922 | |
2923 | // The primary template is used for invalid INVOKE expressions. |
2924 | template<typename _Result, typename _Ret, |
2925 | bool = is_void<_Ret>::value, typename = void> |
2926 | struct __is_invocable_impl |
2927 | : false_type |
2928 | { |
2929 | using __nothrow_conv = false_type; // For is_nothrow_invocable_r |
2930 | }; |
2931 | |
2932 | // Used for valid INVOKE and INVOKE<void> expressions. |
2933 | template<typename _Result, typename _Ret> |
2934 | struct __is_invocable_impl<_Result, _Ret, |
2935 | /* is_void<_Ret> = */ true, |
2936 | __void_t<typename _Result::type>> |
2937 | : true_type |
2938 | { |
2939 | using __nothrow_conv = true_type; // For is_nothrow_invocable_r |
2940 | }; |
2941 | |
2942 | #pragma GCC diagnostic push |
2943 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" |
2944 | // Used for INVOKE<R> expressions to check the implicit conversion to R. |
2945 | template<typename _Result, typename _Ret> |
2946 | struct __is_invocable_impl<_Result, _Ret, |
2947 | /* is_void<_Ret> = */ false, |
2948 | __void_t<typename _Result::type>> |
2949 | { |
2950 | private: |
2951 | // The type of the INVOKE expression. |
2952 | using _Res_t = typename _Result::type; |
2953 | |
2954 | // Unlike declval, this doesn't add_rvalue_reference, so it respects |
2955 | // guaranteed copy elision. |
2956 | static _Res_t _S_get() noexcept; |
2957 | |
2958 | // Used to check if _Res_t can implicitly convert to _Tp. |
2959 | template<typename _Tp> |
2960 | static void _S_conv(__type_identity_t<_Tp>) noexcept; |
2961 | |
2962 | // This overload is viable if INVOKE(f, args...) can convert to _Tp. |
2963 | template<typename _Tp, |
2964 | bool _Nothrow = noexcept(_S_conv<_Tp>(_S_get())), |
2965 | typename = decltype(_S_conv<_Tp>(_S_get())), |
2966 | #if __has_builtin(__reference_converts_from_temporary) |
2967 | bool _Dangle = __reference_converts_from_temporary(_Tp, _Res_t) |
2968 | #else |
2969 | bool _Dangle = false |
2970 | #endif |
2971 | > |
2972 | static __bool_constant<_Nothrow && !_Dangle> |
2973 | _S_test(int); |
2974 | |
2975 | template<typename _Tp, bool = false> |
2976 | static false_type |
2977 | _S_test(...); |
2978 | |
2979 | public: |
2980 | // For is_invocable_r |
2981 | using type = decltype(_S_test<_Ret, /* Nothrow = */ true>(1)); |
2982 | |
2983 | // For is_nothrow_invocable_r |
2984 | using __nothrow_conv = decltype(_S_test<_Ret>(1)); |
2985 | }; |
2986 | #pragma GCC diagnostic pop |
2987 | |
2988 | template<typename _Fn, typename... _ArgTypes> |
2989 | struct __is_invocable |
2990 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type |
2991 | { }; |
2992 | |
2993 | template<typename _Fn, typename _Tp, typename... _Args> |
2994 | constexpr bool __call_is_nt(__invoke_memfun_ref) |
2995 | { |
2996 | using _Up = typename __inv_unwrap<_Tp>::type; |
2997 | return noexcept((std::declval<_Up>().*std::declval<_Fn>())( |
2998 | std::declval<_Args>()...)); |
2999 | } |
3000 | |
3001 | template<typename _Fn, typename _Tp, typename... _Args> |
3002 | constexpr bool __call_is_nt(__invoke_memfun_deref) |
3003 | { |
3004 | return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())( |
3005 | std::declval<_Args>()...)); |
3006 | } |
3007 | |
3008 | template<typename _Fn, typename _Tp> |
3009 | constexpr bool __call_is_nt(__invoke_memobj_ref) |
3010 | { |
3011 | using _Up = typename __inv_unwrap<_Tp>::type; |
3012 | return noexcept(std::declval<_Up>().*std::declval<_Fn>()); |
3013 | } |
3014 | |
3015 | template<typename _Fn, typename _Tp> |
3016 | constexpr bool __call_is_nt(__invoke_memobj_deref) |
3017 | { |
3018 | return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>()); |
3019 | } |
3020 | |
3021 | template<typename _Fn, typename... _Args> |
3022 | constexpr bool __call_is_nt(__invoke_other) |
3023 | { |
3024 | return noexcept(std::declval<_Fn>()(std::declval<_Args>()...)); |
3025 | } |
3026 | |
3027 | template<typename _Result, typename _Fn, typename... _Args> |
3028 | struct __call_is_nothrow |
3029 | : __bool_constant< |
3030 | std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{}) |
3031 | > |
3032 | { }; |
3033 | |
3034 | template<typename _Fn, typename... _Args> |
3035 | using __call_is_nothrow_ |
3036 | = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>; |
3037 | |
3038 | // __is_nothrow_invocable (std::is_nothrow_invocable for C++11) |
3039 | template<typename _Fn, typename... _Args> |
3040 | struct __is_nothrow_invocable |
3041 | : __and_<__is_invocable<_Fn, _Args...>, |
3042 | __call_is_nothrow_<_Fn, _Args...>>::type |
3043 | { }; |
3044 | |
3045 | #pragma GCC diagnostic push |
3046 | #pragma GCC diagnostic ignored "-Wctor-dtor-privacy" |
3047 | struct __nonesuchbase {}; |
3048 | struct __nonesuch : private __nonesuchbase { |
3049 | ~__nonesuch() = delete; |
3050 | __nonesuch(__nonesuch const&) = delete; |
3051 | void operator=(__nonesuch const&) = delete; |
3052 | }; |
3053 | #pragma GCC diagnostic pop |
3054 | /// @endcond |
3055 | |
3056 | #if __cplusplus >= 201703L |
3057 | # define __cpp_lib_is_invocable 201703L |
3058 | |
3059 | /// std::invoke_result |
3060 | template<typename _Functor, typename... _ArgTypes> |
3061 | struct invoke_result |
3062 | : public __invoke_result<_Functor, _ArgTypes...> |
3063 | { |
3064 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Functor>{}), |
3065 | "_Functor must be a complete class or an unbounded array" ); |
3066 | static_assert((std::__is_complete_or_unbounded( |
3067 | __type_identity<_ArgTypes>{}) && ...), |
3068 | "each argument type must be a complete class or an unbounded array" ); |
3069 | }; |
3070 | |
3071 | /// std::invoke_result_t |
3072 | template<typename _Fn, typename... _Args> |
3073 | using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; |
3074 | |
3075 | /// std::is_invocable |
3076 | template<typename _Fn, typename... _ArgTypes> |
3077 | struct is_invocable |
3078 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type |
3079 | { |
3080 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), |
3081 | "_Fn must be a complete class or an unbounded array" ); |
3082 | static_assert((std::__is_complete_or_unbounded( |
3083 | __type_identity<_ArgTypes>{}) && ...), |
3084 | "each argument type must be a complete class or an unbounded array" ); |
3085 | }; |
3086 | |
3087 | /// std::is_invocable_r |
3088 | template<typename _Ret, typename _Fn, typename... _ArgTypes> |
3089 | struct is_invocable_r |
3090 | : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type |
3091 | { |
3092 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), |
3093 | "_Fn must be a complete class or an unbounded array" ); |
3094 | static_assert((std::__is_complete_or_unbounded( |
3095 | __type_identity<_ArgTypes>{}) && ...), |
3096 | "each argument type must be a complete class or an unbounded array" ); |
3097 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), |
3098 | "_Ret must be a complete class or an unbounded array" ); |
3099 | }; |
3100 | |
3101 | /// std::is_nothrow_invocable |
3102 | template<typename _Fn, typename... _ArgTypes> |
3103 | struct is_nothrow_invocable |
3104 | : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>, |
3105 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
3106 | { |
3107 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), |
3108 | "_Fn must be a complete class or an unbounded array" ); |
3109 | static_assert((std::__is_complete_or_unbounded( |
3110 | __type_identity<_ArgTypes>{}) && ...), |
3111 | "each argument type must be a complete class or an unbounded array" ); |
3112 | }; |
3113 | |
3114 | /// @cond undocumented |
3115 | // This checks that the INVOKE<R> expression is well-formed and that the |
3116 | // conversion to R does not throw. It does *not* check whether the INVOKE |
3117 | // expression itself can throw. That is done by __call_is_nothrow_ instead. |
3118 | template<typename _Result, typename _Ret> |
3119 | using __is_nt_invocable_impl |
3120 | = typename __is_invocable_impl<_Result, _Ret>::__nothrow_conv; |
3121 | /// @endcond |
3122 | |
3123 | /// std::is_nothrow_invocable_r |
3124 | template<typename _Ret, typename _Fn, typename... _ArgTypes> |
3125 | struct is_nothrow_invocable_r |
3126 | : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>, |
3127 | __call_is_nothrow_<_Fn, _ArgTypes...>>::type |
3128 | { |
3129 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}), |
3130 | "_Fn must be a complete class or an unbounded array" ); |
3131 | static_assert((std::__is_complete_or_unbounded( |
3132 | __type_identity<_ArgTypes>{}) && ...), |
3133 | "each argument type must be a complete class or an unbounded array" ); |
3134 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Ret>{}), |
3135 | "_Ret must be a complete class or an unbounded array" ); |
3136 | }; |
3137 | #endif // C++17 |
3138 | |
3139 | #if __cplusplus >= 201703L |
3140 | # define __cpp_lib_type_trait_variable_templates 201510L |
3141 | /** |
3142 | * @defgroup variable_templates Variable templates for type traits |
3143 | * @ingroup metaprogramming |
3144 | * |
3145 | * Each variable `is_xxx_v<T>` is a boolean constant with the same value |
3146 | * as the `value` member of the corresponding type trait `is_xxx<T>`. |
3147 | * |
3148 | * @since C++17 unless noted otherwise. |
3149 | */ |
3150 | |
3151 | /** |
3152 | * @{ |
3153 | * @ingroup variable_templates |
3154 | */ |
3155 | template <typename _Tp> |
3156 | inline constexpr bool is_void_v = is_void<_Tp>::value; |
3157 | template <typename _Tp> |
3158 | inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; |
3159 | template <typename _Tp> |
3160 | inline constexpr bool is_integral_v = is_integral<_Tp>::value; |
3161 | template <typename _Tp> |
3162 | inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; |
3163 | |
3164 | template <typename _Tp> |
3165 | inline constexpr bool is_array_v = false; |
3166 | template <typename _Tp> |
3167 | inline constexpr bool is_array_v<_Tp[]> = true; |
3168 | template <typename _Tp, size_t _Num> |
3169 | inline constexpr bool is_array_v<_Tp[_Num]> = true; |
3170 | |
3171 | template <typename _Tp> |
3172 | inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; |
3173 | template <typename _Tp> |
3174 | inline constexpr bool is_lvalue_reference_v = false; |
3175 | template <typename _Tp> |
3176 | inline constexpr bool is_lvalue_reference_v<_Tp&> = true; |
3177 | template <typename _Tp> |
3178 | inline constexpr bool is_rvalue_reference_v = false; |
3179 | template <typename _Tp> |
3180 | inline constexpr bool is_rvalue_reference_v<_Tp&&> = true; |
3181 | template <typename _Tp> |
3182 | inline constexpr bool is_member_object_pointer_v = |
3183 | is_member_object_pointer<_Tp>::value; |
3184 | template <typename _Tp> |
3185 | inline constexpr bool is_member_function_pointer_v = |
3186 | is_member_function_pointer<_Tp>::value; |
3187 | template <typename _Tp> |
3188 | inline constexpr bool is_enum_v = __is_enum(_Tp); |
3189 | template <typename _Tp> |
3190 | inline constexpr bool is_union_v = __is_union(_Tp); |
3191 | template <typename _Tp> |
3192 | inline constexpr bool is_class_v = __is_class(_Tp); |
3193 | template <typename _Tp> |
3194 | inline constexpr bool is_function_v = is_function<_Tp>::value; |
3195 | template <typename _Tp> |
3196 | inline constexpr bool is_reference_v = false; |
3197 | template <typename _Tp> |
3198 | inline constexpr bool is_reference_v<_Tp&> = true; |
3199 | template <typename _Tp> |
3200 | inline constexpr bool is_reference_v<_Tp&&> = true; |
3201 | template <typename _Tp> |
3202 | inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; |
3203 | template <typename _Tp> |
3204 | inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; |
3205 | template <typename _Tp> |
3206 | inline constexpr bool is_object_v = is_object<_Tp>::value; |
3207 | template <typename _Tp> |
3208 | inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; |
3209 | template <typename _Tp> |
3210 | inline constexpr bool is_compound_v = is_compound<_Tp>::value; |
3211 | template <typename _Tp> |
3212 | inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; |
3213 | template <typename _Tp> |
3214 | inline constexpr bool is_const_v = false; |
3215 | template <typename _Tp> |
3216 | inline constexpr bool is_const_v<const _Tp> = true; |
3217 | template <typename _Tp> |
3218 | inline constexpr bool is_volatile_v = false; |
3219 | template <typename _Tp> |
3220 | inline constexpr bool is_volatile_v<volatile _Tp> = true; |
3221 | |
3222 | template <typename _Tp> |
3223 | inline constexpr bool is_trivial_v = __is_trivial(_Tp); |
3224 | template <typename _Tp> |
3225 | inline constexpr bool is_trivially_copyable_v = __is_trivially_copyable(_Tp); |
3226 | template <typename _Tp> |
3227 | inline constexpr bool is_standard_layout_v = __is_standard_layout(_Tp); |
3228 | template <typename _Tp> |
3229 | _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout_v && is_trivial_v" ) |
3230 | inline constexpr bool is_pod_v = __is_pod(_Tp); |
3231 | template <typename _Tp> |
3232 | _GLIBCXX17_DEPRECATED |
3233 | inline constexpr bool is_literal_type_v = __is_literal_type(_Tp); |
3234 | template <typename _Tp> |
3235 | inline constexpr bool is_empty_v = __is_empty(_Tp); |
3236 | template <typename _Tp> |
3237 | inline constexpr bool is_polymorphic_v = __is_polymorphic(_Tp); |
3238 | template <typename _Tp> |
3239 | inline constexpr bool is_abstract_v = __is_abstract(_Tp); |
3240 | template <typename _Tp> |
3241 | inline constexpr bool is_final_v = __is_final(_Tp); |
3242 | |
3243 | template <typename _Tp> |
3244 | inline constexpr bool is_signed_v = is_signed<_Tp>::value; |
3245 | template <typename _Tp> |
3246 | inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; |
3247 | |
3248 | template <typename _Tp, typename... _Args> |
3249 | inline constexpr bool is_constructible_v = __is_constructible(_Tp, _Args...); |
3250 | template <typename _Tp> |
3251 | inline constexpr bool is_default_constructible_v = __is_constructible(_Tp); |
3252 | template <typename _Tp> |
3253 | inline constexpr bool is_copy_constructible_v |
3254 | = __is_constructible(_Tp, __add_lval_ref_t<const _Tp>); |
3255 | template <typename _Tp> |
3256 | inline constexpr bool is_move_constructible_v |
3257 | = __is_constructible(_Tp, __add_rval_ref_t<_Tp>); |
3258 | |
3259 | template <typename _Tp, typename _Up> |
3260 | inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Up); |
3261 | template <typename _Tp> |
3262 | inline constexpr bool is_copy_assignable_v |
3263 | = __is_assignable(__add_lval_ref_t<_Tp>, __add_lval_ref_t<const _Tp>); |
3264 | template <typename _Tp> |
3265 | inline constexpr bool is_move_assignable_v |
3266 | = __is_assignable(__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>); |
3267 | |
3268 | template <typename _Tp> |
3269 | inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; |
3270 | |
3271 | template <typename _Tp, typename... _Args> |
3272 | inline constexpr bool is_trivially_constructible_v |
3273 | = __is_trivially_constructible(_Tp, _Args...); |
3274 | template <typename _Tp> |
3275 | inline constexpr bool is_trivially_default_constructible_v |
3276 | = __is_trivially_constructible(_Tp); |
3277 | template <typename _Tp> |
3278 | inline constexpr bool is_trivially_copy_constructible_v |
3279 | = __is_trivially_constructible(_Tp, __add_lval_ref_t<const _Tp>); |
3280 | template <typename _Tp> |
3281 | inline constexpr bool is_trivially_move_constructible_v |
3282 | = __is_trivially_constructible(_Tp, __add_rval_ref_t<_Tp>); |
3283 | |
3284 | template <typename _Tp, typename _Up> |
3285 | inline constexpr bool is_trivially_assignable_v |
3286 | = __is_trivially_assignable(_Tp, _Up); |
3287 | template <typename _Tp> |
3288 | inline constexpr bool is_trivially_copy_assignable_v |
3289 | = __is_trivially_assignable(__add_lval_ref_t<_Tp>, |
3290 | __add_lval_ref_t<const _Tp>); |
3291 | template <typename _Tp> |
3292 | inline constexpr bool is_trivially_move_assignable_v |
3293 | = __is_trivially_assignable(__add_lval_ref_t<_Tp>, |
3294 | __add_rval_ref_t<_Tp>); |
3295 | template <typename _Tp> |
3296 | inline constexpr bool is_trivially_destructible_v = |
3297 | is_trivially_destructible<_Tp>::value; |
3298 | template <typename _Tp, typename... _Args> |
3299 | inline constexpr bool is_nothrow_constructible_v |
3300 | = __is_nothrow_constructible(_Tp, _Args...); |
3301 | template <typename _Tp> |
3302 | inline constexpr bool is_nothrow_default_constructible_v |
3303 | = __is_nothrow_constructible(_Tp); |
3304 | template <typename _Tp> |
3305 | inline constexpr bool is_nothrow_copy_constructible_v |
3306 | = __is_nothrow_constructible(_Tp, __add_lval_ref_t<const _Tp>); |
3307 | template <typename _Tp> |
3308 | inline constexpr bool is_nothrow_move_constructible_v |
3309 | = __is_nothrow_constructible(_Tp, __add_rval_ref_t<_Tp>); |
3310 | |
3311 | template <typename _Tp, typename _Up> |
3312 | inline constexpr bool is_nothrow_assignable_v |
3313 | = __is_nothrow_assignable(_Tp, _Up); |
3314 | template <typename _Tp> |
3315 | inline constexpr bool is_nothrow_copy_assignable_v |
3316 | = __is_nothrow_assignable(__add_lval_ref_t<_Tp>, |
3317 | __add_lval_ref_t<const _Tp>); |
3318 | template <typename _Tp> |
3319 | inline constexpr bool is_nothrow_move_assignable_v |
3320 | = __is_nothrow_assignable(__add_lval_ref_t<_Tp>, __add_rval_ref_t<_Tp>); |
3321 | |
3322 | template <typename _Tp> |
3323 | inline constexpr bool is_nothrow_destructible_v = |
3324 | is_nothrow_destructible<_Tp>::value; |
3325 | |
3326 | template <typename _Tp> |
3327 | inline constexpr bool has_virtual_destructor_v |
3328 | = __has_virtual_destructor(_Tp); |
3329 | |
3330 | template <typename _Tp> |
3331 | inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; |
3332 | |
3333 | template <typename _Tp> |
3334 | inline constexpr size_t rank_v = 0; |
3335 | template <typename _Tp, size_t _Size> |
3336 | inline constexpr size_t rank_v<_Tp[_Size]> = 1 + rank_v<_Tp>; |
3337 | template <typename _Tp> |
3338 | inline constexpr size_t rank_v<_Tp[]> = 1 + rank_v<_Tp>; |
3339 | |
3340 | template <typename _Tp, unsigned _Idx = 0> |
3341 | inline constexpr size_t extent_v = 0; |
3342 | template <typename _Tp, size_t _Size> |
3343 | inline constexpr size_t extent_v<_Tp[_Size], 0> = _Size; |
3344 | template <typename _Tp, unsigned _Idx, size_t _Size> |
3345 | inline constexpr size_t extent_v<_Tp[_Size], _Idx> = extent_v<_Tp, _Idx - 1>; |
3346 | template <typename _Tp> |
3347 | inline constexpr size_t extent_v<_Tp[], 0> = 0; |
3348 | template <typename _Tp, unsigned _Idx> |
3349 | inline constexpr size_t extent_v<_Tp[], _Idx> = extent_v<_Tp, _Idx - 1>; |
3350 | |
3351 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_SAME |
3352 | template <typename _Tp, typename _Up> |
3353 | inline constexpr bool is_same_v = __is_same(_Tp, _Up); |
3354 | #else |
3355 | template <typename _Tp, typename _Up> |
3356 | inline constexpr bool is_same_v = false; |
3357 | template <typename _Tp> |
3358 | inline constexpr bool is_same_v<_Tp, _Tp> = true; |
3359 | #endif |
3360 | template <typename _Base, typename _Derived> |
3361 | inline constexpr bool is_base_of_v = __is_base_of(_Base, _Derived); |
3362 | #if __has_builtin(__is_convertible) |
3363 | template <typename _From, typename _To> |
3364 | inline constexpr bool is_convertible_v = __is_convertible(_From, _To); |
3365 | #else |
3366 | template <typename _From, typename _To> |
3367 | inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; |
3368 | #endif |
3369 | template<typename _Fn, typename... _Args> |
3370 | inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; |
3371 | template<typename _Fn, typename... _Args> |
3372 | inline constexpr bool is_nothrow_invocable_v |
3373 | = is_nothrow_invocable<_Fn, _Args...>::value; |
3374 | template<typename _Ret, typename _Fn, typename... _Args> |
3375 | inline constexpr bool is_invocable_r_v |
3376 | = is_invocable_r<_Ret, _Fn, _Args...>::value; |
3377 | template<typename _Ret, typename _Fn, typename... _Args> |
3378 | inline constexpr bool is_nothrow_invocable_r_v |
3379 | = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; |
3380 | /// @} |
3381 | |
3382 | #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP |
3383 | # define __cpp_lib_has_unique_object_representations 201606L |
3384 | /// has_unique_object_representations |
3385 | /// @since C++17 |
3386 | template<typename _Tp> |
3387 | struct has_unique_object_representations |
3388 | : bool_constant<__has_unique_object_representations( |
3389 | remove_cv_t<remove_all_extents_t<_Tp>> |
3390 | )> |
3391 | { |
3392 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}), |
3393 | "template argument must be a complete class or an unbounded array" ); |
3394 | }; |
3395 | |
3396 | /// @ingroup variable_templates |
3397 | template<typename _Tp> |
3398 | inline constexpr bool has_unique_object_representations_v |
3399 | = has_unique_object_representations<_Tp>::value; |
3400 | #endif |
3401 | |
3402 | #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE |
3403 | # define __cpp_lib_is_aggregate 201703L |
3404 | /// is_aggregate - true if the type is an aggregate. |
3405 | /// @since C++17 |
3406 | template<typename _Tp> |
3407 | struct is_aggregate |
3408 | : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> |
3409 | { }; |
3410 | |
3411 | /** is_aggregate_v - true if the type is an aggregate. |
3412 | * @ingroup variable_templates |
3413 | * @since C++17 |
3414 | */ |
3415 | template<typename _Tp> |
3416 | inline constexpr bool is_aggregate_v = __is_aggregate(remove_cv_t<_Tp>); |
3417 | #endif |
3418 | #endif // C++17 |
3419 | |
3420 | #if __cplusplus >= 202002L |
3421 | |
3422 | /** * Remove references and cv-qualifiers. |
3423 | * @since C++20 |
3424 | * @{ |
3425 | */ |
3426 | #define __cpp_lib_remove_cvref 201711L |
3427 | |
3428 | #if __has_builtin(__remove_cvref) |
3429 | template<typename _Tp> |
3430 | struct remove_cvref |
3431 | { using type = __remove_cvref(_Tp); }; |
3432 | #else |
3433 | template<typename _Tp> |
3434 | struct remove_cvref |
3435 | { using type = typename remove_cv<_Tp>::type; }; |
3436 | |
3437 | template<typename _Tp> |
3438 | struct remove_cvref<_Tp&> |
3439 | { using type = typename remove_cv<_Tp>::type; }; |
3440 | |
3441 | template<typename _Tp> |
3442 | struct remove_cvref<_Tp&&> |
3443 | { using type = typename remove_cv<_Tp>::type; }; |
3444 | #endif |
3445 | |
3446 | template<typename _Tp> |
3447 | using remove_cvref_t = typename remove_cvref<_Tp>::type; |
3448 | /// @} |
3449 | |
3450 | /** * Identity metafunction. |
3451 | * @since C++20 |
3452 | * @{ |
3453 | */ |
3454 | #define __cpp_lib_type_identity 201806L |
3455 | template<typename _Tp> |
3456 | struct type_identity { using type = _Tp; }; |
3457 | |
3458 | template<typename _Tp> |
3459 | using type_identity_t = typename type_identity<_Tp>::type; |
3460 | /// @} |
3461 | |
3462 | #define __cpp_lib_unwrap_ref 201811L |
3463 | |
3464 | /** Unwrap a reference_wrapper |
3465 | * @since C++20 |
3466 | * @{ |
3467 | */ |
3468 | template<typename _Tp> |
3469 | struct unwrap_reference { using type = _Tp; }; |
3470 | |
3471 | template<typename _Tp> |
3472 | struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; }; |
3473 | |
3474 | template<typename _Tp> |
3475 | using unwrap_reference_t = typename unwrap_reference<_Tp>::type; |
3476 | /// @} |
3477 | |
3478 | /** Decay type and if it's a reference_wrapper, unwrap it |
3479 | * @since C++20 |
3480 | * @{ |
3481 | */ |
3482 | template<typename _Tp> |
3483 | struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; }; |
3484 | |
3485 | template<typename _Tp> |
3486 | using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type; |
3487 | /// @} |
3488 | |
3489 | #define __cpp_lib_bounded_array_traits 201902L |
3490 | |
3491 | /// True for a type that is an array of known bound. |
3492 | /// @ingroup variable_templates |
3493 | /// @since C++20 |
3494 | template<typename _Tp> |
3495 | inline constexpr bool is_bounded_array_v = false; |
3496 | |
3497 | template<typename _Tp, size_t _Size> |
3498 | inline constexpr bool is_bounded_array_v<_Tp[_Size]> = true; |
3499 | |
3500 | /// True for a type that is an array of unknown bound. |
3501 | /// @ingroup variable_templates |
3502 | /// @since C++20 |
3503 | template<typename _Tp> |
3504 | inline constexpr bool is_unbounded_array_v = false; |
3505 | |
3506 | template<typename _Tp> |
3507 | inline constexpr bool is_unbounded_array_v<_Tp[]> = true; |
3508 | |
3509 | /// True for a type that is an array of known bound. |
3510 | /// @since C++20 |
3511 | template<typename _Tp> |
3512 | struct is_bounded_array |
3513 | : public bool_constant<is_bounded_array_v<_Tp>> |
3514 | { }; |
3515 | |
3516 | /// True for a type that is an array of unknown bound. |
3517 | /// @since C++20 |
3518 | template<typename _Tp> |
3519 | struct is_unbounded_array |
3520 | : public bool_constant<is_unbounded_array_v<_Tp>> |
3521 | { }; |
3522 | |
3523 | #if __has_builtin(__is_layout_compatible) |
3524 | |
3525 | /// @since C++20 |
3526 | template<typename _Tp, typename _Up> |
3527 | struct is_layout_compatible |
3528 | : bool_constant<__is_layout_compatible(_Tp, _Up)> |
3529 | { }; |
3530 | |
3531 | /// @ingroup variable_templates |
3532 | /// @since C++20 |
3533 | template<typename _Tp, typename _Up> |
3534 | constexpr bool is_layout_compatible_v |
3535 | = __is_layout_compatible(_Tp, _Up); |
3536 | |
3537 | #if __has_builtin(__builtin_is_corresponding_member) |
3538 | #define __cpp_lib_is_layout_compatible 201907L |
3539 | |
3540 | /// @since C++20 |
3541 | template<typename _S1, typename _S2, typename _M1, typename _M2> |
3542 | constexpr bool |
3543 | is_corresponding_member(_M1 _S1::*__m1, _M2 _S2::*__m2) noexcept |
3544 | { return __builtin_is_corresponding_member(__m1, __m2); } |
3545 | #endif |
3546 | #endif |
3547 | |
3548 | #if __has_builtin(__is_pointer_interconvertible_base_of) |
3549 | /// True if `_Derived` is standard-layout and has a base class of type `_Base` |
3550 | /// @since C++20 |
3551 | template<typename _Base, typename _Derived> |
3552 | struct is_pointer_interconvertible_base_of |
3553 | : bool_constant<__is_pointer_interconvertible_base_of(_Base, _Derived)> |
3554 | { }; |
3555 | |
3556 | /// @ingroup variable_templates |
3557 | /// @since C++20 |
3558 | template<typename _Base, typename _Derived> |
3559 | constexpr bool is_pointer_interconvertible_base_of_v |
3560 | = __is_pointer_interconvertible_base_of(_Base, _Derived); |
3561 | |
3562 | #if __has_builtin(__builtin_is_pointer_interconvertible_with_class) |
3563 | #define __cpp_lib_is_pointer_interconvertible 201907L |
3564 | |
3565 | /// True if `__mp` points to the first member of a standard-layout type |
3566 | /// @returns true if `s.*__mp` is pointer-interconvertible with `s` |
3567 | /// @since C++20 |
3568 | template<typename _Tp, typename _Mem> |
3569 | constexpr bool |
3570 | is_pointer_interconvertible_with_class(_Mem _Tp::*__mp) noexcept |
3571 | { return __builtin_is_pointer_interconvertible_with_class(__mp); } |
3572 | #endif |
3573 | #endif |
3574 | |
3575 | #if __cplusplus > 202002L |
3576 | #define __cpp_lib_is_scoped_enum 202011L |
3577 | |
3578 | /// True if the type is a scoped enumeration type. |
3579 | /// @since C++23 |
3580 | |
3581 | template<typename _Tp> |
3582 | struct is_scoped_enum |
3583 | : false_type |
3584 | { }; |
3585 | |
3586 | template<typename _Tp> |
3587 | requires __is_enum(_Tp) |
3588 | && requires(remove_cv_t<_Tp> __t) { __t = __t; } // fails if incomplete |
3589 | struct is_scoped_enum<_Tp> |
3590 | : bool_constant<!requires(_Tp __t, void(*__f)(int)) { __f(__t); }> |
3591 | { }; |
3592 | |
3593 | /// @ingroup variable_templates |
3594 | /// @since C++23 |
3595 | template<typename _Tp> |
3596 | inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; |
3597 | |
3598 | #if __has_builtin(__reference_constructs_from_temporary) \ |
3599 | && __has_builtin(__reference_converts_from_temporary) |
3600 | |
3601 | #define __cpp_lib_reference_from_temporary 202202L |
3602 | |
3603 | /// True if _Tp is a reference type, a _Up value can be bound to _Tp in |
3604 | /// direct-initialization, and a temporary object would be bound to |
3605 | /// the reference, false otherwise. |
3606 | /// @since C++23 |
3607 | template<typename _Tp, typename _Up> |
3608 | struct reference_constructs_from_temporary |
3609 | : public bool_constant<__reference_constructs_from_temporary(_Tp, _Up)> |
3610 | { |
3611 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}) |
3612 | && std::__is_complete_or_unbounded(__type_identity<_Up>{}), |
3613 | "template argument must be a complete class or an unbounded array" ); |
3614 | }; |
3615 | |
3616 | /// True if _Tp is a reference type, a _Up value can be bound to _Tp in |
3617 | /// copy-initialization, and a temporary object would be bound to |
3618 | /// the reference, false otherwise. |
3619 | /// @since C++23 |
3620 | template<typename _Tp, typename _Up> |
3621 | struct reference_converts_from_temporary |
3622 | : public bool_constant<__reference_converts_from_temporary(_Tp, _Up)> |
3623 | { |
3624 | static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}) |
3625 | && std::__is_complete_or_unbounded(__type_identity<_Up>{}), |
3626 | "template argument must be a complete class or an unbounded array" ); |
3627 | }; |
3628 | |
3629 | /// @ingroup variable_templates |
3630 | /// @since C++23 |
3631 | template<typename _Tp, typename _Up> |
3632 | inline constexpr bool reference_constructs_from_temporary_v |
3633 | = reference_constructs_from_temporary<_Tp, _Up>::value; |
3634 | |
3635 | /// @ingroup variable_templates |
3636 | /// @since C++23 |
3637 | template<typename _Tp, typename _Up> |
3638 | inline constexpr bool reference_converts_from_temporary_v |
3639 | = reference_converts_from_temporary<_Tp, _Up>::value; |
3640 | #endif // __has_builtin for reference_from_temporary |
3641 | #endif // C++23 |
3642 | |
3643 | #if _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED |
3644 | #define __cpp_lib_is_constant_evaluated 201811L |
3645 | |
3646 | /// Returns true only when called during constant evaluation. |
3647 | /// @since C++20 |
3648 | constexpr inline bool |
3649 | is_constant_evaluated() noexcept |
3650 | { |
3651 | #if __cpp_if_consteval >= 202106L |
3652 | if consteval { return true; } else { return false; } |
3653 | #else |
3654 | return __builtin_is_constant_evaluated(); |
3655 | #endif |
3656 | } |
3657 | #endif |
3658 | |
3659 | /// @cond undocumented |
3660 | template<typename _From, typename _To> |
3661 | using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type; |
3662 | |
3663 | template<typename _Xp, typename _Yp> |
3664 | using __cond_res |
3665 | = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); |
3666 | |
3667 | template<typename _Ap, typename _Bp, typename = void> |
3668 | struct __common_ref_impl |
3669 | { }; |
3670 | |
3671 | // [meta.trans.other], COMMON-REF(A, B) |
3672 | template<typename _Ap, typename _Bp> |
3673 | using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type; |
3674 | |
3675 | // COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &) |
3676 | template<typename _Xp, typename _Yp> |
3677 | using __condres_cvref |
3678 | = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; |
3679 | |
3680 | // If A and B are both lvalue reference types, ... |
3681 | template<typename _Xp, typename _Yp> |
3682 | struct __common_ref_impl<_Xp&, _Yp&, __void_t<__condres_cvref<_Xp, _Yp>>> |
3683 | : enable_if<is_reference_v<__condres_cvref<_Xp, _Yp>>, |
3684 | __condres_cvref<_Xp, _Yp>> |
3685 | { }; |
3686 | |
3687 | // let C be remove_reference_t<COMMON-REF(X&, Y&)>&& |
3688 | template<typename _Xp, typename _Yp> |
3689 | using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&; |
3690 | |
3691 | // If A and B are both rvalue reference types, ... |
3692 | template<typename _Xp, typename _Yp> |
3693 | struct __common_ref_impl<_Xp&&, _Yp&&, |
3694 | _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>, |
3695 | is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>> |
3696 | { using type = __common_ref_C<_Xp, _Yp>; }; |
3697 | |
3698 | // let D be COMMON-REF(const X&, Y&) |
3699 | template<typename _Xp, typename _Yp> |
3700 | using __common_ref_D = __common_ref<const _Xp&, _Yp&>; |
3701 | |
3702 | // If A is an rvalue reference and B is an lvalue reference, ... |
3703 | template<typename _Xp, typename _Yp> |
3704 | struct __common_ref_impl<_Xp&&, _Yp&, |
3705 | _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>> |
3706 | { using type = __common_ref_D<_Xp, _Yp>; }; |
3707 | |
3708 | // If A is an lvalue reference and B is an rvalue reference, ... |
3709 | template<typename _Xp, typename _Yp> |
3710 | struct __common_ref_impl<_Xp&, _Yp&&> |
3711 | : __common_ref_impl<_Yp&&, _Xp&> |
3712 | { }; |
3713 | /// @endcond |
3714 | |
3715 | template<typename _Tp, typename _Up, |
3716 | template<typename> class _TQual, template<typename> class _UQual> |
3717 | struct basic_common_reference |
3718 | { }; |
3719 | |
3720 | /// @cond undocumented |
3721 | template<typename _Tp> |
3722 | struct __xref |
3723 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; }; |
3724 | |
3725 | template<typename _Tp> |
3726 | struct __xref<_Tp&> |
3727 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&; }; |
3728 | |
3729 | template<typename _Tp> |
3730 | struct __xref<_Tp&&> |
3731 | { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&&; }; |
3732 | |
3733 | template<typename _Tp1, typename _Tp2> |
3734 | using __basic_common_ref |
3735 | = typename basic_common_reference<remove_cvref_t<_Tp1>, |
3736 | remove_cvref_t<_Tp2>, |
3737 | __xref<_Tp1>::template __type, |
3738 | __xref<_Tp2>::template __type>::type; |
3739 | /// @endcond |
3740 | |
3741 | template<typename... _Tp> |
3742 | struct common_reference; |
3743 | |
3744 | template<typename... _Tp> |
3745 | using common_reference_t = typename common_reference<_Tp...>::type; |
3746 | |
3747 | // If sizeof...(T) is zero, there shall be no member type. |
3748 | template<> |
3749 | struct common_reference<> |
3750 | { }; |
3751 | |
3752 | // If sizeof...(T) is one ... |
3753 | template<typename _Tp0> |
3754 | struct common_reference<_Tp0> |
3755 | { using type = _Tp0; }; |
3756 | |
3757 | /// @cond undocumented |
3758 | template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void> |
3759 | struct __common_reference_impl |
3760 | : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1> |
3761 | { }; |
3762 | |
3763 | // If sizeof...(T) is two ... |
3764 | template<typename _Tp1, typename _Tp2> |
3765 | struct common_reference<_Tp1, _Tp2> |
3766 | : __common_reference_impl<_Tp1, _Tp2> |
3767 | { }; |
3768 | |
3769 | // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ... |
3770 | template<typename _Tp1, typename _Tp2> |
3771 | struct __common_reference_impl<_Tp1&, _Tp2&, 1, |
3772 | void_t<__common_ref<_Tp1&, _Tp2&>>> |
3773 | { using type = __common_ref<_Tp1&, _Tp2&>; }; |
3774 | |
3775 | template<typename _Tp1, typename _Tp2> |
3776 | struct __common_reference_impl<_Tp1&&, _Tp2&&, 1, |
3777 | void_t<__common_ref<_Tp1&&, _Tp2&&>>> |
3778 | { using type = __common_ref<_Tp1&&, _Tp2&&>; }; |
3779 | |
3780 | template<typename _Tp1, typename _Tp2> |
3781 | struct __common_reference_impl<_Tp1&, _Tp2&&, 1, |
3782 | void_t<__common_ref<_Tp1&, _Tp2&&>>> |
3783 | { using type = __common_ref<_Tp1&, _Tp2&&>; }; |
3784 | |
3785 | template<typename _Tp1, typename _Tp2> |
3786 | struct __common_reference_impl<_Tp1&&, _Tp2&, 1, |
3787 | void_t<__common_ref<_Tp1&&, _Tp2&>>> |
3788 | { using type = __common_ref<_Tp1&&, _Tp2&>; }; |
3789 | |
3790 | // Otherwise, if basic_common_reference<...>::type is well-formed, ... |
3791 | template<typename _Tp1, typename _Tp2> |
3792 | struct __common_reference_impl<_Tp1, _Tp2, 2, |
3793 | void_t<__basic_common_ref<_Tp1, _Tp2>>> |
3794 | { using type = __basic_common_ref<_Tp1, _Tp2>; }; |
3795 | |
3796 | // Otherwise, if COND-RES(T1, T2) is well-formed, ... |
3797 | template<typename _Tp1, typename _Tp2> |
3798 | struct __common_reference_impl<_Tp1, _Tp2, 3, |
3799 | void_t<__cond_res<_Tp1, _Tp2>>> |
3800 | { using type = __cond_res<_Tp1, _Tp2>; }; |
3801 | |
3802 | // Otherwise, if common_type_t<T1, T2> is well-formed, ... |
3803 | template<typename _Tp1, typename _Tp2> |
3804 | struct __common_reference_impl<_Tp1, _Tp2, 4, |
3805 | void_t<common_type_t<_Tp1, _Tp2>>> |
3806 | { using type = common_type_t<_Tp1, _Tp2>; }; |
3807 | |
3808 | // Otherwise, there shall be no member type. |
3809 | template<typename _Tp1, typename _Tp2> |
3810 | struct __common_reference_impl<_Tp1, _Tp2, 5, void> |
3811 | { }; |
3812 | |
3813 | // Otherwise, if sizeof...(T) is greater than two, ... |
3814 | template<typename _Tp1, typename _Tp2, typename... _Rest> |
3815 | struct common_reference<_Tp1, _Tp2, _Rest...> |
3816 | : __common_type_fold<common_reference<_Tp1, _Tp2>, |
3817 | __common_type_pack<_Rest...>> |
3818 | { }; |
3819 | |
3820 | // Reuse __common_type_fold for common_reference<T1, T2, Rest...> |
3821 | template<typename _Tp1, typename _Tp2, typename... _Rest> |
3822 | struct __common_type_fold<common_reference<_Tp1, _Tp2>, |
3823 | __common_type_pack<_Rest...>, |
3824 | void_t<common_reference_t<_Tp1, _Tp2>>> |
3825 | : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...> |
3826 | { }; |
3827 | /// @endcond |
3828 | |
3829 | #endif // C++2a |
3830 | |
3831 | /// @} group metaprogramming |
3832 | |
3833 | _GLIBCXX_END_NAMESPACE_VERSION |
3834 | } // namespace std |
3835 | |
3836 | #endif // C++11 |
3837 | |
3838 | #endif // _GLIBCXX_TYPE_TRAITS |
3839 | |