1 | // unique_ptr implementation -*- C++ -*- |
2 | |
3 | // Copyright (C) 2008-2023 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 bits/unique_ptr.h |
26 | * This is an internal header file, included by other library headers. |
27 | * Do not attempt to use it directly. @headername{memory} |
28 | */ |
29 | |
30 | #ifndef _UNIQUE_PTR_H |
31 | #define _UNIQUE_PTR_H 1 |
32 | |
33 | #include <bits/c++config.h> |
34 | #include <debug/assertions.h> |
35 | #include <type_traits> |
36 | #include <tuple> |
37 | #include <bits/stl_function.h> |
38 | #include <bits/functional_hash.h> |
39 | #if __cplusplus >= 202002L |
40 | # include <compare> |
41 | # if _GLIBCXX_HOSTED |
42 | # include <ostream> |
43 | # endif |
44 | #endif |
45 | |
46 | /* Duplicate definition with ptr_traits.h. */ |
47 | #if __cplusplus > 202002L && defined(__cpp_constexpr_dynamic_alloc) |
48 | # define __cpp_lib_constexpr_memory 202202L |
49 | #elif __cplusplus > 201703L |
50 | # define __cpp_lib_constexpr_memory 201811L |
51 | #endif |
52 | |
53 | namespace std _GLIBCXX_VISIBILITY(default) |
54 | { |
55 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
56 | |
57 | /** |
58 | * @addtogroup pointer_abstractions |
59 | * @{ |
60 | */ |
61 | |
62 | #if _GLIBCXX_USE_DEPRECATED |
63 | #pragma GCC diagnostic push |
64 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" |
65 | template<typename> class auto_ptr; |
66 | #pragma GCC diagnostic pop |
67 | #endif |
68 | |
69 | /** Primary template of default_delete, used by unique_ptr for single objects |
70 | * |
71 | * @headerfile memory |
72 | * @since C++11 |
73 | */ |
74 | template<typename _Tp> |
75 | struct default_delete |
76 | { |
77 | /// Default constructor |
78 | constexpr default_delete() noexcept = default; |
79 | |
80 | /** @brief Converting constructor. |
81 | * |
82 | * Allows conversion from a deleter for objects of another type, `_Up`, |
83 | * only if `_Up*` is convertible to `_Tp*`. |
84 | */ |
85 | template<typename _Up, |
86 | typename = _Require<is_convertible<_Up*, _Tp*>>> |
87 | _GLIBCXX23_CONSTEXPR |
88 | default_delete(const default_delete<_Up>&) noexcept { } |
89 | |
90 | /// Calls `delete __ptr` |
91 | _GLIBCXX23_CONSTEXPR |
92 | void |
93 | operator()(_Tp* __ptr) const |
94 | { |
95 | static_assert(!is_void<_Tp>::value, |
96 | "can't delete pointer to incomplete type" ); |
97 | static_assert(sizeof(_Tp)>0, |
98 | "can't delete pointer to incomplete type" ); |
99 | delete __ptr; |
100 | } |
101 | }; |
102 | |
103 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
104 | // DR 740 - omit specialization for array objects with a compile time length |
105 | |
106 | /** Specialization of default_delete for arrays, used by `unique_ptr<T[]>` |
107 | * |
108 | * @headerfile memory |
109 | * @since C++11 |
110 | */ |
111 | template<typename _Tp> |
112 | struct default_delete<_Tp[]> |
113 | { |
114 | public: |
115 | /// Default constructor |
116 | constexpr default_delete() noexcept = default; |
117 | |
118 | /** @brief Converting constructor. |
119 | * |
120 | * Allows conversion from a deleter for arrays of another type, such as |
121 | * a const-qualified version of `_Tp`. |
122 | * |
123 | * Conversions from types derived from `_Tp` are not allowed because |
124 | * it is undefined to `delete[]` an array of derived types through a |
125 | * pointer to the base type. |
126 | */ |
127 | template<typename _Up, |
128 | typename = _Require<is_convertible<_Up(*)[], _Tp(*)[]>>> |
129 | _GLIBCXX23_CONSTEXPR |
130 | default_delete(const default_delete<_Up[]>&) noexcept { } |
131 | |
132 | /// Calls `delete[] __ptr` |
133 | template<typename _Up> |
134 | _GLIBCXX23_CONSTEXPR |
135 | typename enable_if<is_convertible<_Up(*)[], _Tp(*)[]>::value>::type |
136 | operator()(_Up* __ptr) const |
137 | { |
138 | static_assert(sizeof(_Tp)>0, |
139 | "can't delete pointer to incomplete type" ); |
140 | delete [] __ptr; |
141 | } |
142 | }; |
143 | |
144 | /// @cond undocumented |
145 | |
146 | // Manages the pointer and deleter of a unique_ptr |
147 | template <typename _Tp, typename _Dp> |
148 | class __uniq_ptr_impl |
149 | { |
150 | template <typename _Up, typename _Ep, typename = void> |
151 | struct _Ptr |
152 | { |
153 | using type = _Up*; |
154 | }; |
155 | |
156 | template <typename _Up, typename _Ep> |
157 | struct |
158 | _Ptr<_Up, _Ep, __void_t<typename remove_reference<_Ep>::type::pointer>> |
159 | { |
160 | using type = typename remove_reference<_Ep>::type::pointer; |
161 | }; |
162 | |
163 | public: |
164 | using _DeleterConstraint = enable_if< |
165 | __and_<__not_<is_pointer<_Dp>>, |
166 | is_default_constructible<_Dp>>::value>; |
167 | |
168 | using pointer = typename _Ptr<_Tp, _Dp>::type; |
169 | |
170 | static_assert( !is_rvalue_reference<_Dp>::value, |
171 | "unique_ptr's deleter type must be a function object type" |
172 | " or an lvalue reference type" ); |
173 | |
174 | __uniq_ptr_impl() = default; |
175 | _GLIBCXX23_CONSTEXPR |
176 | __uniq_ptr_impl(pointer __p) : _M_t() { _M_ptr() = __p; } |
177 | |
178 | template<typename _Del> |
179 | _GLIBCXX23_CONSTEXPR |
180 | __uniq_ptr_impl(pointer __p, _Del&& __d) |
181 | : _M_t(__p, std::forward<_Del>(__d)) { } |
182 | |
183 | _GLIBCXX23_CONSTEXPR |
184 | __uniq_ptr_impl(__uniq_ptr_impl&& __u) noexcept |
185 | : _M_t(std::move(__u._M_t)) |
186 | { __u._M_ptr() = nullptr; } |
187 | |
188 | _GLIBCXX23_CONSTEXPR |
189 | __uniq_ptr_impl& operator=(__uniq_ptr_impl&& __u) noexcept |
190 | { |
191 | reset(p: __u.release()); |
192 | _M_deleter() = std::forward<_Dp>(__u._M_deleter()); |
193 | return *this; |
194 | } |
195 | |
196 | _GLIBCXX23_CONSTEXPR |
197 | pointer& _M_ptr() noexcept { return std::get<0>(_M_t); } |
198 | _GLIBCXX23_CONSTEXPR |
199 | pointer _M_ptr() const noexcept { return std::get<0>(_M_t); } |
200 | _GLIBCXX23_CONSTEXPR |
201 | _Dp& _M_deleter() noexcept { return std::get<1>(_M_t); } |
202 | _GLIBCXX23_CONSTEXPR |
203 | const _Dp& _M_deleter() const noexcept { return std::get<1>(_M_t); } |
204 | |
205 | _GLIBCXX23_CONSTEXPR |
206 | void reset(pointer __p) noexcept |
207 | { |
208 | const pointer __old_p = _M_ptr(); |
209 | _M_ptr() = __p; |
210 | if (__old_p) |
211 | _M_deleter()(__old_p); |
212 | } |
213 | |
214 | _GLIBCXX23_CONSTEXPR |
215 | pointer release() noexcept |
216 | { |
217 | pointer __p = _M_ptr(); |
218 | _M_ptr() = nullptr; |
219 | return __p; |
220 | } |
221 | |
222 | _GLIBCXX23_CONSTEXPR |
223 | void |
224 | swap(__uniq_ptr_impl& __rhs) noexcept |
225 | { |
226 | using std::swap; |
227 | swap(this->_M_ptr(), __rhs._M_ptr()); |
228 | swap(this->_M_deleter(), __rhs._M_deleter()); |
229 | } |
230 | |
231 | private: |
232 | tuple<pointer, _Dp> _M_t; |
233 | }; |
234 | |
235 | // Defines move construction + assignment as either defaulted or deleted. |
236 | template <typename _Tp, typename _Dp, |
237 | bool = is_move_constructible<_Dp>::value, |
238 | bool = is_move_assignable<_Dp>::value> |
239 | struct __uniq_ptr_data : __uniq_ptr_impl<_Tp, _Dp> |
240 | { |
241 | using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl; |
242 | __uniq_ptr_data(__uniq_ptr_data&&) = default; |
243 | __uniq_ptr_data& operator=(__uniq_ptr_data&&) = default; |
244 | }; |
245 | |
246 | template <typename _Tp, typename _Dp> |
247 | struct __uniq_ptr_data<_Tp, _Dp, true, false> : __uniq_ptr_impl<_Tp, _Dp> |
248 | { |
249 | using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl; |
250 | __uniq_ptr_data(__uniq_ptr_data&&) = default; |
251 | __uniq_ptr_data& operator=(__uniq_ptr_data&&) = delete; |
252 | }; |
253 | |
254 | template <typename _Tp, typename _Dp> |
255 | struct __uniq_ptr_data<_Tp, _Dp, false, true> : __uniq_ptr_impl<_Tp, _Dp> |
256 | { |
257 | using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl; |
258 | __uniq_ptr_data(__uniq_ptr_data&&) = delete; |
259 | __uniq_ptr_data& operator=(__uniq_ptr_data&&) = default; |
260 | }; |
261 | |
262 | template <typename _Tp, typename _Dp> |
263 | struct __uniq_ptr_data<_Tp, _Dp, false, false> : __uniq_ptr_impl<_Tp, _Dp> |
264 | { |
265 | using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl; |
266 | __uniq_ptr_data(__uniq_ptr_data&&) = delete; |
267 | __uniq_ptr_data& operator=(__uniq_ptr_data&&) = delete; |
268 | }; |
269 | /// @endcond |
270 | |
271 | // 20.7.1.2 unique_ptr for single objects. |
272 | |
273 | /// A move-only smart pointer that manages unique ownership of a resource. |
274 | /// @headerfile memory |
275 | /// @since C++11 |
276 | template <typename _Tp, typename _Dp = default_delete<_Tp>> |
277 | class unique_ptr |
278 | { |
279 | template <typename _Up> |
280 | using _DeleterConstraint = |
281 | typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type; |
282 | |
283 | __uniq_ptr_data<_Tp, _Dp> _M_t; |
284 | |
285 | public: |
286 | using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer; |
287 | using element_type = _Tp; |
288 | using deleter_type = _Dp; |
289 | |
290 | private: |
291 | // helper template for detecting a safe conversion from another |
292 | // unique_ptr |
293 | template<typename _Up, typename _Ep> |
294 | using __safe_conversion_up = __and_< |
295 | is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>, |
296 | __not_<is_array<_Up>> |
297 | >; |
298 | |
299 | public: |
300 | // Constructors. |
301 | |
302 | /// Default constructor, creates a unique_ptr that owns nothing. |
303 | template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>> |
304 | constexpr unique_ptr() noexcept |
305 | : _M_t() |
306 | { } |
307 | |
308 | /** Takes ownership of a pointer. |
309 | * |
310 | * @param __p A pointer to an object of @c element_type |
311 | * |
312 | * The deleter will be value-initialized. |
313 | */ |
314 | template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>> |
315 | _GLIBCXX23_CONSTEXPR |
316 | explicit |
317 | unique_ptr(pointer __p) noexcept |
318 | : _M_t(__p) |
319 | { } |
320 | |
321 | /** Takes ownership of a pointer. |
322 | * |
323 | * @param __p A pointer to an object of @c element_type |
324 | * @param __d A reference to a deleter. |
325 | * |
326 | * The deleter will be initialized with @p __d |
327 | */ |
328 | template<typename _Del = deleter_type, |
329 | typename = _Require<is_copy_constructible<_Del>>> |
330 | _GLIBCXX23_CONSTEXPR |
331 | unique_ptr(pointer __p, const deleter_type& __d) noexcept |
332 | : _M_t(__p, __d) { } |
333 | |
334 | /** Takes ownership of a pointer. |
335 | * |
336 | * @param __p A pointer to an object of @c element_type |
337 | * @param __d An rvalue reference to a (non-reference) deleter. |
338 | * |
339 | * The deleter will be initialized with @p std::move(__d) |
340 | */ |
341 | template<typename _Del = deleter_type, |
342 | typename = _Require<is_move_constructible<_Del>>> |
343 | _GLIBCXX23_CONSTEXPR |
344 | unique_ptr(pointer __p, |
345 | __enable_if_t<!is_lvalue_reference<_Del>::value, |
346 | _Del&&> __d) noexcept |
347 | : _M_t(__p, std::move(__d)) |
348 | { } |
349 | |
350 | template<typename _Del = deleter_type, |
351 | typename _DelUnref = typename remove_reference<_Del>::type> |
352 | _GLIBCXX23_CONSTEXPR |
353 | unique_ptr(pointer, |
354 | __enable_if_t<is_lvalue_reference<_Del>::value, |
355 | _DelUnref&&>) = delete; |
356 | |
357 | /// Creates a unique_ptr that owns nothing. |
358 | template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>> |
359 | constexpr unique_ptr(nullptr_t) noexcept |
360 | : _M_t() |
361 | { } |
362 | |
363 | // Move constructors. |
364 | |
365 | /// Move constructor. |
366 | unique_ptr(unique_ptr&&) = default; |
367 | |
368 | /** @brief Converting constructor from another type |
369 | * |
370 | * Requires that the pointer owned by @p __u is convertible to the |
371 | * type of pointer owned by this object, @p __u does not own an array, |
372 | * and @p __u has a compatible deleter type. |
373 | */ |
374 | template<typename _Up, typename _Ep, typename = _Require< |
375 | __safe_conversion_up<_Up, _Ep>, |
376 | __conditional_t<is_reference<_Dp>::value, |
377 | is_same<_Ep, _Dp>, |
378 | is_convertible<_Ep, _Dp>>>> |
379 | _GLIBCXX23_CONSTEXPR |
380 | unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept |
381 | : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter())) |
382 | { } |
383 | |
384 | #if _GLIBCXX_USE_DEPRECATED |
385 | #pragma GCC diagnostic push |
386 | #pragma GCC diagnostic ignored "-Wdeprecated-declarations" |
387 | /// Converting constructor from @c auto_ptr |
388 | template<typename _Up, typename = _Require< |
389 | is_convertible<_Up*, _Tp*>, is_same<_Dp, default_delete<_Tp>>>> |
390 | unique_ptr(auto_ptr<_Up>&& __u) noexcept; |
391 | #pragma GCC diagnostic pop |
392 | #endif |
393 | |
394 | /// Destructor, invokes the deleter if the stored pointer is not null. |
395 | #if __cplusplus > 202002L && __cpp_constexpr_dynamic_alloc |
396 | constexpr |
397 | #endif |
398 | ~unique_ptr() noexcept |
399 | { |
400 | static_assert(__is_invocable<deleter_type&, pointer>::value, |
401 | "unique_ptr's deleter must be invocable with a pointer" ); |
402 | auto& __ptr = _M_t._M_ptr(); |
403 | if (__ptr != nullptr) |
404 | get_deleter()(std::move(__ptr)); |
405 | __ptr = pointer(); |
406 | } |
407 | |
408 | // Assignment. |
409 | |
410 | /** @brief Move assignment operator. |
411 | * |
412 | * Invokes the deleter if this object owns a pointer. |
413 | */ |
414 | unique_ptr& operator=(unique_ptr&&) = default; |
415 | |
416 | /** @brief Assignment from another type. |
417 | * |
418 | * @param __u The object to transfer ownership from, which owns a |
419 | * convertible pointer to a non-array object. |
420 | * |
421 | * Invokes the deleter if this object owns a pointer. |
422 | */ |
423 | template<typename _Up, typename _Ep> |
424 | _GLIBCXX23_CONSTEXPR |
425 | typename enable_if< __and_< |
426 | __safe_conversion_up<_Up, _Ep>, |
427 | is_assignable<deleter_type&, _Ep&&> |
428 | >::value, |
429 | unique_ptr&>::type |
430 | operator=(unique_ptr<_Up, _Ep>&& __u) noexcept |
431 | { |
432 | reset(p: __u.release()); |
433 | get_deleter() = std::forward<_Ep>(__u.get_deleter()); |
434 | return *this; |
435 | } |
436 | |
437 | /// Reset the %unique_ptr to empty, invoking the deleter if necessary. |
438 | _GLIBCXX23_CONSTEXPR |
439 | unique_ptr& |
440 | operator=(nullptr_t) noexcept |
441 | { |
442 | reset(); |
443 | return *this; |
444 | } |
445 | |
446 | // Observers. |
447 | |
448 | /// Dereference the stored pointer. |
449 | _GLIBCXX23_CONSTEXPR |
450 | typename add_lvalue_reference<element_type>::type |
451 | operator*() const noexcept(noexcept(*std::declval<pointer>())) |
452 | { |
453 | __glibcxx_assert(get() != pointer()); |
454 | return *get(); |
455 | } |
456 | |
457 | /// Return the stored pointer. |
458 | _GLIBCXX23_CONSTEXPR |
459 | pointer |
460 | operator->() const noexcept |
461 | { |
462 | _GLIBCXX_DEBUG_PEDASSERT(get() != pointer()); |
463 | return get(); |
464 | } |
465 | |
466 | /// Return the stored pointer. |
467 | _GLIBCXX23_CONSTEXPR |
468 | pointer |
469 | get() const noexcept |
470 | { return _M_t._M_ptr(); } |
471 | |
472 | /// Return a reference to the stored deleter. |
473 | _GLIBCXX23_CONSTEXPR |
474 | deleter_type& |
475 | get_deleter() noexcept |
476 | { return _M_t._M_deleter(); } |
477 | |
478 | /// Return a reference to the stored deleter. |
479 | _GLIBCXX23_CONSTEXPR |
480 | const deleter_type& |
481 | get_deleter() const noexcept |
482 | { return _M_t._M_deleter(); } |
483 | |
484 | /// Return @c true if the stored pointer is not null. |
485 | _GLIBCXX23_CONSTEXPR |
486 | explicit operator bool() const noexcept |
487 | { return get() == pointer() ? false : true; } |
488 | |
489 | // Modifiers. |
490 | |
491 | /// Release ownership of any stored pointer. |
492 | _GLIBCXX23_CONSTEXPR |
493 | pointer |
494 | release() noexcept |
495 | { return _M_t.release(); } |
496 | |
497 | /** @brief Replace the stored pointer. |
498 | * |
499 | * @param __p The new pointer to store. |
500 | * |
501 | * The deleter will be invoked if a pointer is already owned. |
502 | */ |
503 | _GLIBCXX23_CONSTEXPR |
504 | void |
505 | reset(pointer __p = pointer()) noexcept |
506 | { |
507 | static_assert(__is_invocable<deleter_type&, pointer>::value, |
508 | "unique_ptr's deleter must be invocable with a pointer" ); |
509 | _M_t.reset(std::move(__p)); |
510 | } |
511 | |
512 | /// Exchange the pointer and deleter with another object. |
513 | _GLIBCXX23_CONSTEXPR |
514 | void |
515 | swap(unique_ptr& __u) noexcept |
516 | { |
517 | static_assert(__is_swappable<_Dp>::value, "deleter must be swappable" ); |
518 | _M_t.swap(__u._M_t); |
519 | } |
520 | |
521 | // Disable copy from lvalue. |
522 | unique_ptr(const unique_ptr&) = delete; |
523 | unique_ptr& operator=(const unique_ptr&) = delete; |
524 | }; |
525 | |
526 | // 20.7.1.3 unique_ptr for array objects with a runtime length |
527 | // [unique.ptr.runtime] |
528 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
529 | // DR 740 - omit specialization for array objects with a compile time length |
530 | |
531 | /// A move-only smart pointer that manages unique ownership of an array. |
532 | /// @headerfile memory |
533 | /// @since C++11 |
534 | template<typename _Tp, typename _Dp> |
535 | class unique_ptr<_Tp[], _Dp> |
536 | { |
537 | template <typename _Up> |
538 | using _DeleterConstraint = |
539 | typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type; |
540 | |
541 | __uniq_ptr_data<_Tp, _Dp> _M_t; |
542 | |
543 | // like is_base_of<_Tp, _Up> but false if unqualified types are the same |
544 | template<typename _Up> |
545 | using __is_derived_Tp |
546 | = __and_< is_base_of<_Tp, _Up>, |
547 | __not_<is_same<__remove_cv_t<_Tp>, __remove_cv_t<_Up>>> >; |
548 | |
549 | public: |
550 | using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer; |
551 | using element_type = _Tp; |
552 | using deleter_type = _Dp; |
553 | |
554 | // helper template for detecting a safe conversion from another |
555 | // unique_ptr |
556 | template<typename _Up, typename _Ep, |
557 | typename _UPtr = unique_ptr<_Up, _Ep>, |
558 | typename _UP_pointer = typename _UPtr::pointer, |
559 | typename _UP_element_type = typename _UPtr::element_type> |
560 | using __safe_conversion_up = __and_< |
561 | is_array<_Up>, |
562 | is_same<pointer, element_type*>, |
563 | is_same<_UP_pointer, _UP_element_type*>, |
564 | is_convertible<_UP_element_type(*)[], element_type(*)[]> |
565 | >; |
566 | |
567 | // helper template for detecting a safe conversion from a raw pointer |
568 | template<typename _Up> |
569 | using __safe_conversion_raw = __and_< |
570 | __or_<__or_<is_same<_Up, pointer>, |
571 | is_same<_Up, nullptr_t>>, |
572 | __and_<is_pointer<_Up>, |
573 | is_same<pointer, element_type*>, |
574 | is_convertible< |
575 | typename remove_pointer<_Up>::type(*)[], |
576 | element_type(*)[]> |
577 | > |
578 | > |
579 | >; |
580 | |
581 | // Constructors. |
582 | |
583 | /// Default constructor, creates a unique_ptr that owns nothing. |
584 | template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>> |
585 | constexpr unique_ptr() noexcept |
586 | : _M_t() |
587 | { } |
588 | |
589 | /** Takes ownership of a pointer. |
590 | * |
591 | * @param __p A pointer to an array of a type safely convertible |
592 | * to an array of @c element_type |
593 | * |
594 | * The deleter will be value-initialized. |
595 | */ |
596 | template<typename _Up, |
597 | typename _Vp = _Dp, |
598 | typename = _DeleterConstraint<_Vp>, |
599 | typename = typename enable_if< |
600 | __safe_conversion_raw<_Up>::value, bool>::type> |
601 | _GLIBCXX23_CONSTEXPR |
602 | explicit |
603 | unique_ptr(_Up __p) noexcept |
604 | : _M_t(__p) |
605 | { } |
606 | |
607 | /** Takes ownership of a pointer. |
608 | * |
609 | * @param __p A pointer to an array of a type safely convertible |
610 | * to an array of @c element_type |
611 | * @param __d A reference to a deleter. |
612 | * |
613 | * The deleter will be initialized with @p __d |
614 | */ |
615 | template<typename _Up, typename _Del = deleter_type, |
616 | typename = _Require<__safe_conversion_raw<_Up>, |
617 | is_copy_constructible<_Del>>> |
618 | _GLIBCXX23_CONSTEXPR |
619 | unique_ptr(_Up __p, const deleter_type& __d) noexcept |
620 | : _M_t(__p, __d) { } |
621 | |
622 | /** Takes ownership of a pointer. |
623 | * |
624 | * @param __p A pointer to an array of a type safely convertible |
625 | * to an array of @c element_type |
626 | * @param __d A reference to a deleter. |
627 | * |
628 | * The deleter will be initialized with @p std::move(__d) |
629 | */ |
630 | template<typename _Up, typename _Del = deleter_type, |
631 | typename = _Require<__safe_conversion_raw<_Up>, |
632 | is_move_constructible<_Del>>> |
633 | _GLIBCXX23_CONSTEXPR |
634 | unique_ptr(_Up __p, |
635 | __enable_if_t<!is_lvalue_reference<_Del>::value, |
636 | _Del&&> __d) noexcept |
637 | : _M_t(std::move(__p), std::move(__d)) |
638 | { } |
639 | |
640 | template<typename _Up, typename _Del = deleter_type, |
641 | typename _DelUnref = typename remove_reference<_Del>::type, |
642 | typename = _Require<__safe_conversion_raw<_Up>>> |
643 | unique_ptr(_Up, |
644 | __enable_if_t<is_lvalue_reference<_Del>::value, |
645 | _DelUnref&&>) = delete; |
646 | |
647 | /// Move constructor. |
648 | unique_ptr(unique_ptr&&) = default; |
649 | |
650 | /// Creates a unique_ptr that owns nothing. |
651 | template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>> |
652 | constexpr unique_ptr(nullptr_t) noexcept |
653 | : _M_t() |
654 | { } |
655 | |
656 | template<typename _Up, typename _Ep, typename = _Require< |
657 | __safe_conversion_up<_Up, _Ep>, |
658 | __conditional_t<is_reference<_Dp>::value, |
659 | is_same<_Ep, _Dp>, |
660 | is_convertible<_Ep, _Dp>>>> |
661 | _GLIBCXX23_CONSTEXPR |
662 | unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept |
663 | : _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter())) |
664 | { } |
665 | |
666 | /// Destructor, invokes the deleter if the stored pointer is not null. |
667 | #if __cplusplus > 202002L && __cpp_constexpr_dynamic_alloc |
668 | constexpr |
669 | #endif |
670 | ~unique_ptr() |
671 | { |
672 | auto& __ptr = _M_t._M_ptr(); |
673 | if (__ptr != nullptr) |
674 | get_deleter()(__ptr); |
675 | __ptr = pointer(); |
676 | } |
677 | |
678 | // Assignment. |
679 | |
680 | /** @brief Move assignment operator. |
681 | * |
682 | * Invokes the deleter if this object owns a pointer. |
683 | */ |
684 | unique_ptr& |
685 | operator=(unique_ptr&&) = default; |
686 | |
687 | /** @brief Assignment from another type. |
688 | * |
689 | * @param __u The object to transfer ownership from, which owns a |
690 | * convertible pointer to an array object. |
691 | * |
692 | * Invokes the deleter if this object owns a pointer. |
693 | */ |
694 | template<typename _Up, typename _Ep> |
695 | _GLIBCXX23_CONSTEXPR |
696 | typename |
697 | enable_if<__and_<__safe_conversion_up<_Up, _Ep>, |
698 | is_assignable<deleter_type&, _Ep&&> |
699 | >::value, |
700 | unique_ptr&>::type |
701 | operator=(unique_ptr<_Up, _Ep>&& __u) noexcept |
702 | { |
703 | reset(__u.release()); |
704 | get_deleter() = std::forward<_Ep>(__u.get_deleter()); |
705 | return *this; |
706 | } |
707 | |
708 | /// Reset the %unique_ptr to empty, invoking the deleter if necessary. |
709 | _GLIBCXX23_CONSTEXPR |
710 | unique_ptr& |
711 | operator=(nullptr_t) noexcept |
712 | { |
713 | reset(); |
714 | return *this; |
715 | } |
716 | |
717 | // Observers. |
718 | |
719 | /// Access an element of owned array. |
720 | _GLIBCXX23_CONSTEXPR |
721 | typename std::add_lvalue_reference<element_type>::type |
722 | operator[](size_t __i) const |
723 | { |
724 | __glibcxx_assert(get() != pointer()); |
725 | return get()[__i]; |
726 | } |
727 | |
728 | /// Return the stored pointer. |
729 | _GLIBCXX23_CONSTEXPR |
730 | pointer |
731 | get() const noexcept |
732 | { return _M_t._M_ptr(); } |
733 | |
734 | /// Return a reference to the stored deleter. |
735 | _GLIBCXX23_CONSTEXPR |
736 | deleter_type& |
737 | get_deleter() noexcept |
738 | { return _M_t._M_deleter(); } |
739 | |
740 | /// Return a reference to the stored deleter. |
741 | _GLIBCXX23_CONSTEXPR |
742 | const deleter_type& |
743 | get_deleter() const noexcept |
744 | { return _M_t._M_deleter(); } |
745 | |
746 | /// Return @c true if the stored pointer is not null. |
747 | _GLIBCXX23_CONSTEXPR |
748 | explicit operator bool() const noexcept |
749 | { return get() == pointer() ? false : true; } |
750 | |
751 | // Modifiers. |
752 | |
753 | /// Release ownership of any stored pointer. |
754 | _GLIBCXX23_CONSTEXPR |
755 | pointer |
756 | release() noexcept |
757 | { return _M_t.release(); } |
758 | |
759 | /** @brief Replace the stored pointer. |
760 | * |
761 | * @param __p The new pointer to store. |
762 | * |
763 | * The deleter will be invoked if a pointer is already owned. |
764 | */ |
765 | template <typename _Up, |
766 | typename = _Require< |
767 | __or_<is_same<_Up, pointer>, |
768 | __and_<is_same<pointer, element_type*>, |
769 | is_pointer<_Up>, |
770 | is_convertible< |
771 | typename remove_pointer<_Up>::type(*)[], |
772 | element_type(*)[] |
773 | > |
774 | > |
775 | > |
776 | >> |
777 | _GLIBCXX23_CONSTEXPR |
778 | void |
779 | reset(_Up __p) noexcept |
780 | { _M_t.reset(std::move(__p)); } |
781 | |
782 | _GLIBCXX23_CONSTEXPR |
783 | void reset(nullptr_t = nullptr) noexcept |
784 | { reset(pointer()); } |
785 | |
786 | /// Exchange the pointer and deleter with another object. |
787 | _GLIBCXX23_CONSTEXPR |
788 | void |
789 | swap(unique_ptr& __u) noexcept |
790 | { |
791 | static_assert(__is_swappable<_Dp>::value, "deleter must be swappable" ); |
792 | _M_t.swap(__u._M_t); |
793 | } |
794 | |
795 | // Disable copy from lvalue. |
796 | unique_ptr(const unique_ptr&) = delete; |
797 | unique_ptr& operator=(const unique_ptr&) = delete; |
798 | }; |
799 | |
800 | /// @{ |
801 | /// @relates unique_ptr |
802 | |
803 | /// Swap overload for unique_ptr |
804 | template<typename _Tp, typename _Dp> |
805 | inline |
806 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
807 | // Constrained free swap overload, see p0185r1 |
808 | _GLIBCXX23_CONSTEXPR |
809 | typename enable_if<__is_swappable<_Dp>::value>::type |
810 | #else |
811 | void |
812 | #endif |
813 | swap(unique_ptr<_Tp, _Dp>& __x, |
814 | unique_ptr<_Tp, _Dp>& __y) noexcept |
815 | { __x.swap(__y); } |
816 | |
817 | #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 |
818 | template<typename _Tp, typename _Dp> |
819 | typename enable_if<!__is_swappable<_Dp>::value>::type |
820 | swap(unique_ptr<_Tp, _Dp>&, |
821 | unique_ptr<_Tp, _Dp>&) = delete; |
822 | #endif |
823 | |
824 | /// Equality operator for unique_ptr objects, compares the owned pointers |
825 | template<typename _Tp, typename _Dp, |
826 | typename _Up, typename _Ep> |
827 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
828 | inline bool |
829 | operator==(const unique_ptr<_Tp, _Dp>& __x, |
830 | const unique_ptr<_Up, _Ep>& __y) |
831 | { return __x.get() == __y.get(); } |
832 | |
833 | /// unique_ptr comparison with nullptr |
834 | template<typename _Tp, typename _Dp> |
835 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
836 | inline bool |
837 | operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept |
838 | { return !__x; } |
839 | |
840 | #ifndef __cpp_lib_three_way_comparison |
841 | /// unique_ptr comparison with nullptr |
842 | template<typename _Tp, typename _Dp> |
843 | _GLIBCXX_NODISCARD |
844 | inline bool |
845 | operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept |
846 | { return !__x; } |
847 | |
848 | /// Inequality operator for unique_ptr objects, compares the owned pointers |
849 | template<typename _Tp, typename _Dp, |
850 | typename _Up, typename _Ep> |
851 | _GLIBCXX_NODISCARD |
852 | inline bool |
853 | operator!=(const unique_ptr<_Tp, _Dp>& __x, |
854 | const unique_ptr<_Up, _Ep>& __y) |
855 | { return __x.get() != __y.get(); } |
856 | |
857 | /// unique_ptr comparison with nullptr |
858 | template<typename _Tp, typename _Dp> |
859 | _GLIBCXX_NODISCARD |
860 | inline bool |
861 | operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept |
862 | { return (bool)__x; } |
863 | |
864 | /// unique_ptr comparison with nullptr |
865 | template<typename _Tp, typename _Dp> |
866 | _GLIBCXX_NODISCARD |
867 | inline bool |
868 | operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept |
869 | { return (bool)__x; } |
870 | #endif // three way comparison |
871 | |
872 | /// Relational operator for unique_ptr objects, compares the owned pointers |
873 | template<typename _Tp, typename _Dp, |
874 | typename _Up, typename _Ep> |
875 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
876 | inline bool |
877 | operator<(const unique_ptr<_Tp, _Dp>& __x, |
878 | const unique_ptr<_Up, _Ep>& __y) |
879 | { |
880 | typedef typename |
881 | std::common_type<typename unique_ptr<_Tp, _Dp>::pointer, |
882 | typename unique_ptr<_Up, _Ep>::pointer>::type _CT; |
883 | return std::less<_CT>()(__x.get(), __y.get()); |
884 | } |
885 | |
886 | /// unique_ptr comparison with nullptr |
887 | template<typename _Tp, typename _Dp> |
888 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
889 | inline bool |
890 | operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) |
891 | { |
892 | return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(), |
893 | nullptr); |
894 | } |
895 | |
896 | /// unique_ptr comparison with nullptr |
897 | template<typename _Tp, typename _Dp> |
898 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
899 | inline bool |
900 | operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) |
901 | { |
902 | return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr, |
903 | __x.get()); |
904 | } |
905 | |
906 | /// Relational operator for unique_ptr objects, compares the owned pointers |
907 | template<typename _Tp, typename _Dp, |
908 | typename _Up, typename _Ep> |
909 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
910 | inline bool |
911 | operator<=(const unique_ptr<_Tp, _Dp>& __x, |
912 | const unique_ptr<_Up, _Ep>& __y) |
913 | { return !(__y < __x); } |
914 | |
915 | /// unique_ptr comparison with nullptr |
916 | template<typename _Tp, typename _Dp> |
917 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
918 | inline bool |
919 | operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) |
920 | { return !(nullptr < __x); } |
921 | |
922 | /// unique_ptr comparison with nullptr |
923 | template<typename _Tp, typename _Dp> |
924 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
925 | inline bool |
926 | operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) |
927 | { return !(__x < nullptr); } |
928 | |
929 | /// Relational operator for unique_ptr objects, compares the owned pointers |
930 | template<typename _Tp, typename _Dp, |
931 | typename _Up, typename _Ep> |
932 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
933 | inline bool |
934 | operator>(const unique_ptr<_Tp, _Dp>& __x, |
935 | const unique_ptr<_Up, _Ep>& __y) |
936 | { return (__y < __x); } |
937 | |
938 | /// unique_ptr comparison with nullptr |
939 | template<typename _Tp, typename _Dp> |
940 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
941 | inline bool |
942 | operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) |
943 | { |
944 | return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr, |
945 | __x.get()); |
946 | } |
947 | |
948 | /// unique_ptr comparison with nullptr |
949 | template<typename _Tp, typename _Dp> |
950 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
951 | inline bool |
952 | operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) |
953 | { |
954 | return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(), |
955 | nullptr); |
956 | } |
957 | |
958 | /// Relational operator for unique_ptr objects, compares the owned pointers |
959 | template<typename _Tp, typename _Dp, |
960 | typename _Up, typename _Ep> |
961 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
962 | inline bool |
963 | operator>=(const unique_ptr<_Tp, _Dp>& __x, |
964 | const unique_ptr<_Up, _Ep>& __y) |
965 | { return !(__x < __y); } |
966 | |
967 | /// unique_ptr comparison with nullptr |
968 | template<typename _Tp, typename _Dp> |
969 | _GLIBCXX_NODISCARD _GLIBCXX23_CONSTEXPR |
970 | inline bool |
971 | operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) |
972 | { return !(__x < nullptr); } |
973 | |
974 | /// unique_ptr comparison with nullptr |
975 | template<typename _Tp, typename _Dp> |
976 | _GLIBCXX_NODISCARD inline bool |
977 | operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) |
978 | { return !(nullptr < __x); } |
979 | |
980 | #ifdef __cpp_lib_three_way_comparison |
981 | template<typename _Tp, typename _Dp, typename _Up, typename _Ep> |
982 | requires three_way_comparable_with<typename unique_ptr<_Tp, _Dp>::pointer, |
983 | typename unique_ptr<_Up, _Ep>::pointer> |
984 | _GLIBCXX23_CONSTEXPR |
985 | inline |
986 | compare_three_way_result_t<typename unique_ptr<_Tp, _Dp>::pointer, |
987 | typename unique_ptr<_Up, _Ep>::pointer> |
988 | operator<=>(const unique_ptr<_Tp, _Dp>& __x, |
989 | const unique_ptr<_Up, _Ep>& __y) |
990 | { return compare_three_way()(__x.get(), __y.get()); } |
991 | |
992 | template<typename _Tp, typename _Dp> |
993 | requires three_way_comparable<typename unique_ptr<_Tp, _Dp>::pointer> |
994 | _GLIBCXX23_CONSTEXPR |
995 | inline |
996 | compare_three_way_result_t<typename unique_ptr<_Tp, _Dp>::pointer> |
997 | operator<=>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) |
998 | { |
999 | using pointer = typename unique_ptr<_Tp, _Dp>::pointer; |
1000 | return compare_three_way()(__x.get(), static_cast<pointer>(nullptr)); |
1001 | } |
1002 | #endif |
1003 | /// @} relates unique_ptr |
1004 | |
1005 | /// @cond undocumented |
1006 | template<typename _Up, typename _Ptr = typename _Up::pointer, |
1007 | bool = __poison_hash<_Ptr>::__enable_hash_call> |
1008 | struct __uniq_ptr_hash |
1009 | #if ! _GLIBCXX_INLINE_VERSION |
1010 | : private __poison_hash<_Ptr> |
1011 | #endif |
1012 | { |
1013 | size_t |
1014 | operator()(const _Up& __u) const |
1015 | noexcept(noexcept(std::declval<hash<_Ptr>>()(std::declval<_Ptr>()))) |
1016 | { return hash<_Ptr>()(__u.get()); } |
1017 | }; |
1018 | |
1019 | template<typename _Up, typename _Ptr> |
1020 | struct __uniq_ptr_hash<_Up, _Ptr, false> |
1021 | : private __poison_hash<_Ptr> |
1022 | { }; |
1023 | /// @endcond |
1024 | |
1025 | /// std::hash specialization for unique_ptr. |
1026 | template<typename _Tp, typename _Dp> |
1027 | struct hash<unique_ptr<_Tp, _Dp>> |
1028 | : public __hash_base<size_t, unique_ptr<_Tp, _Dp>>, |
1029 | public __uniq_ptr_hash<unique_ptr<_Tp, _Dp>> |
1030 | { }; |
1031 | |
1032 | #if __cplusplus >= 201402L && _GLIBCXX_HOSTED |
1033 | #define __cpp_lib_make_unique 201304L |
1034 | |
1035 | /// @cond undocumented |
1036 | namespace __detail |
1037 | { |
1038 | template<typename _Tp> |
1039 | struct _MakeUniq |
1040 | { typedef unique_ptr<_Tp> __single_object; }; |
1041 | |
1042 | template<typename _Tp> |
1043 | struct _MakeUniq<_Tp[]> |
1044 | { typedef unique_ptr<_Tp[]> __array; }; |
1045 | |
1046 | template<typename _Tp, size_t _Bound> |
1047 | struct _MakeUniq<_Tp[_Bound]> |
1048 | { struct __invalid_type { }; }; |
1049 | |
1050 | template<typename _Tp> |
1051 | using __unique_ptr_t = typename _MakeUniq<_Tp>::__single_object; |
1052 | template<typename _Tp> |
1053 | using __unique_ptr_array_t = typename _MakeUniq<_Tp>::__array; |
1054 | template<typename _Tp> |
1055 | using __invalid_make_unique_t = typename _MakeUniq<_Tp>::__invalid_type; |
1056 | } |
1057 | /// @endcond |
1058 | |
1059 | /** Create an object owned by a `unique_ptr`. |
1060 | * @tparam _Tp A non-array object type. |
1061 | * @param __args Constructor arguments for the new object. |
1062 | * @returns A `unique_ptr<_Tp>` that owns the new object. |
1063 | * @since C++14 |
1064 | * @relates unique_ptr |
1065 | */ |
1066 | template<typename _Tp, typename... _Args> |
1067 | _GLIBCXX23_CONSTEXPR |
1068 | inline __detail::__unique_ptr_t<_Tp> |
1069 | make_unique(_Args&&... __args) |
1070 | { return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); } |
1071 | |
1072 | /** Create an array owned by a `unique_ptr`. |
1073 | * @tparam _Tp An array type of unknown bound, such as `U[]`. |
1074 | * @param __num The number of elements of type `U` in the new array. |
1075 | * @returns A `unique_ptr<U[]>` that owns the new array. |
1076 | * @since C++14 |
1077 | * @relates unique_ptr |
1078 | * |
1079 | * The array elements are value-initialized. |
1080 | */ |
1081 | template<typename _Tp> |
1082 | _GLIBCXX23_CONSTEXPR |
1083 | inline __detail::__unique_ptr_array_t<_Tp> |
1084 | make_unique(size_t __num) |
1085 | { return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__num]()); } |
1086 | |
1087 | /** Disable std::make_unique for arrays of known bound. |
1088 | * @tparam _Tp An array type of known bound, such as `U[N]`. |
1089 | * @since C++14 |
1090 | * @relates unique_ptr |
1091 | */ |
1092 | template<typename _Tp, typename... _Args> |
1093 | __detail::__invalid_make_unique_t<_Tp> |
1094 | make_unique(_Args&&...) = delete; |
1095 | |
1096 | #if __cplusplus > 201703L |
1097 | /** Create a default-initialied object owned by a `unique_ptr`. |
1098 | * @tparam _Tp A non-array object type. |
1099 | * @returns A `unique_ptr<_Tp>` that owns the new object. |
1100 | * @since C++20 |
1101 | * @relates unique_ptr |
1102 | */ |
1103 | template<typename _Tp> |
1104 | _GLIBCXX23_CONSTEXPR |
1105 | inline __detail::__unique_ptr_t<_Tp> |
1106 | make_unique_for_overwrite() |
1107 | { return unique_ptr<_Tp>(new _Tp); } |
1108 | |
1109 | /** Create a default-initialized array owned by a `unique_ptr`. |
1110 | * @tparam _Tp An array type of unknown bound, such as `U[]`. |
1111 | * @param __num The number of elements of type `U` in the new array. |
1112 | * @returns A `unique_ptr<U[]>` that owns the new array. |
1113 | * @since C++20 |
1114 | * @relates unique_ptr |
1115 | */ |
1116 | template<typename _Tp> |
1117 | _GLIBCXX23_CONSTEXPR |
1118 | inline __detail::__unique_ptr_array_t<_Tp> |
1119 | make_unique_for_overwrite(size_t __num) |
1120 | { return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__num]); } |
1121 | |
1122 | /** Disable std::make_unique_for_overwrite for arrays of known bound. |
1123 | * @tparam _Tp An array type of known bound, such as `U[N]`. |
1124 | * @since C++20 |
1125 | * @relates unique_ptr |
1126 | */ |
1127 | template<typename _Tp, typename... _Args> |
1128 | __detail::__invalid_make_unique_t<_Tp> |
1129 | make_unique_for_overwrite(_Args&&...) = delete; |
1130 | #endif // C++20 |
1131 | |
1132 | #endif // C++14 && HOSTED |
1133 | |
1134 | #if __cplusplus > 201703L && __cpp_concepts && _GLIBCXX_HOSTED |
1135 | // _GLIBCXX_RESOLVE_LIB_DEFECTS |
1136 | // 2948. unique_ptr does not define operator<< for stream output |
1137 | /// Stream output operator for unique_ptr |
1138 | /// @relates unique_ptr |
1139 | /// @since C++20 |
1140 | template<typename _CharT, typename _Traits, typename _Tp, typename _Dp> |
1141 | inline basic_ostream<_CharT, _Traits>& |
1142 | operator<<(basic_ostream<_CharT, _Traits>& __os, |
1143 | const unique_ptr<_Tp, _Dp>& __p) |
1144 | requires requires { __os << __p.get(); } |
1145 | { |
1146 | __os << __p.get(); |
1147 | return __os; |
1148 | } |
1149 | #endif // C++20 && HOSTED |
1150 | |
1151 | /// @} group pointer_abstractions |
1152 | |
1153 | #if __cplusplus >= 201703L |
1154 | namespace __detail::__variant |
1155 | { |
1156 | template<typename> struct _Never_valueless_alt; // see <variant> |
1157 | |
1158 | // Provide the strong exception-safety guarantee when emplacing a |
1159 | // unique_ptr into a variant. |
1160 | template<typename _Tp, typename _Del> |
1161 | struct _Never_valueless_alt<std::unique_ptr<_Tp, _Del>> |
1162 | : std::true_type |
1163 | { }; |
1164 | } // namespace __detail::__variant |
1165 | #endif // C++17 |
1166 | |
1167 | _GLIBCXX_END_NAMESPACE_VERSION |
1168 | } // namespace |
1169 | |
1170 | #endif /* _UNIQUE_PTR_H */ |
1171 | |