master
1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP_MEMORY
11#define _LIBCPP_MEMORY
12
13// clang-format off
14
15/*
16 memory synopsis
17
18namespace std
19{
20
21struct allocator_arg_t { };
22inline constexpr allocator_arg_t allocator_arg = allocator_arg_t();
23
24template <class T, class Alloc> struct uses_allocator;
25
26template <class Ptr>
27struct pointer_traits
28{
29 typedef Ptr pointer;
30 typedef <details> element_type;
31 typedef <details> difference_type;
32
33 template <class U> using rebind = <details>;
34
35 static pointer pointer_to(<details>);
36};
37
38template <class T>
39struct pointer_traits<T*>
40{
41 typedef T* pointer;
42 typedef T element_type;
43 typedef ptrdiff_t difference_type;
44
45 template <class U> using rebind = U*;
46
47 static pointer pointer_to(<details>) noexcept; // constexpr in C++20
48};
49
50template <class T> constexpr T* to_address(T* p) noexcept; // C++20
51template <class Ptr> constexpr auto to_address(const Ptr& p) noexcept; // C++20
52
53template <class Alloc>
54struct allocator_traits
55{
56 typedef Alloc allocator_type;
57 typedef typename allocator_type::value_type
58 value_type;
59
60 typedef Alloc::pointer | value_type* pointer;
61 typedef Alloc::const_pointer
62 | pointer_traits<pointer>::rebind<const value_type>
63 const_pointer;
64 typedef Alloc::void_pointer
65 | pointer_traits<pointer>::rebind<void>
66 void_pointer;
67 typedef Alloc::const_void_pointer
68 | pointer_traits<pointer>::rebind<const void>
69 const_void_pointer;
70 typedef Alloc::difference_type
71 | pointer_traits<pointer>::difference_type
72 difference_type;
73 typedef Alloc::size_type
74 | make_unsigned<difference_type>::type
75 size_type;
76 typedef Alloc::propagate_on_container_copy_assignment
77 | false_type propagate_on_container_copy_assignment;
78 typedef Alloc::propagate_on_container_move_assignment
79 | false_type propagate_on_container_move_assignment;
80 typedef Alloc::propagate_on_container_swap
81 | false_type propagate_on_container_swap;
82 typedef Alloc::is_always_equal
83 | is_empty is_always_equal;
84
85 template <class T> using rebind_alloc = Alloc::rebind<T>::other | Alloc<T, Args...>;
86 template <class T> using rebind_traits = allocator_traits<rebind_alloc<T>>;
87
88 static pointer allocate(allocator_type& a, size_type n); // constexpr and [[nodiscard]] in C++20
89 static pointer allocate(allocator_type& a, size_type n, const_void_pointer hint); // constexpr and [[nodiscard]] in C++20
90
91 [[nodiscard]] static constexpr allocation_result<pointer, size_type>
92 allocate_at_least(Alloc& a, size_type n); // Since C++23
93
94 static void deallocate(allocator_type& a, pointer p, size_type n) noexcept; // constexpr in C++20
95
96 template <class T, class... Args>
97 static void construct(allocator_type& a, T* p, Args&&... args); // constexpr in C++20
98
99 template <class T>
100 static void destroy(allocator_type& a, T* p); // constexpr in C++20
101
102 static size_type max_size(const allocator_type& a); // noexcept in C++14, constexpr in C++20
103 static allocator_type select_on_container_copy_construction(const allocator_type& a); // constexpr in C++20
104};
105
106template<class Pointer, class SizeType = size_t>
107struct allocation_result {
108 Pointer ptr;
109 SizeType count;
110}; // Since C++23
111
112template <>
113class allocator<void> // removed in C++20
114{
115public:
116 typedef void* pointer;
117 typedef const void* const_pointer;
118 typedef void value_type;
119
120 template <class _Up> struct rebind {typedef allocator<_Up> other;};
121};
122
123template <class T>
124class allocator
125{
126public:
127 typedef size_t size_type;
128 typedef ptrdiff_t difference_type;
129 typedef T* pointer; // deprecated in C++17, removed in C++20
130 typedef const T* const_pointer; // deprecated in C++17, removed in C++20
131 typedef typename add_lvalue_reference<T>::type
132 reference; // deprecated in C++17, removed in C++20
133 typedef typename add_lvalue_reference<const T>::type
134 const_reference; // deprecated in C++17, removed in C++20
135
136 typedef T value_type;
137
138 template <class U> struct rebind {typedef allocator<U> other;}; // deprecated in C++17, removed in C++20
139
140 typedef true_type propagate_on_container_move_assignment;
141 typedef true_type is_always_equal; // Deprecated in C++23, removed in C++26
142
143 constexpr allocator() noexcept; // constexpr in C++20
144 constexpr allocator(const allocator&) noexcept; // constexpr in C++20
145 template <class U>
146 constexpr allocator(const allocator<U>&) noexcept; // constexpr in C++20
147 ~allocator(); // constexpr in C++20
148 pointer address(reference x) const noexcept; // deprecated in C++17, removed in C++20
149 const_pointer address(const_reference x) const noexcept; // deprecated in C++17, removed in C++20
150 T* allocate(size_t n, const void* hint); // deprecated in C++17, removed in C++20
151 T* allocate(size_t n); // constexpr in C++20
152 void deallocate(T* p, size_t n) noexcept; // constexpr in C++20
153 size_type max_size() const noexcept; // deprecated in C++17, removed in C++20
154 template<class U, class... Args>
155 void construct(U* p, Args&&... args); // deprecated in C++17, removed in C++20
156 template <class U>
157 void destroy(U* p); // deprecated in C++17, removed in C++20
158};
159
160template <class T, class U>
161bool operator==(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20
162
163template <class T, class U>
164bool operator!=(const allocator<T>&, const allocator<U>&) noexcept; // removed in C++20
165
166template <class OutputIterator, class T>
167class raw_storage_iterator // deprecated in C++17, removed in C++20
168 : public iterator<output_iterator_tag, void, void, void, void> // until C++17
169{
170public:
171 typedef output_iterator_tag iterator_category;
172 typedef void value_type;
173 typedef void difference_type; // until C++20
174 typedef ptrdiff_t difference_type; // since C++20
175 typedef void pointer;
176 typedef void reference;
177
178 explicit raw_storage_iterator(OutputIterator x);
179 raw_storage_iterator& operator*();
180 raw_storage_iterator& operator=(const T& element);
181 raw_storage_iterator& operator++();
182 raw_storage_iterator operator++(int);
183};
184
185template <class T> pair<T*,ptrdiff_t> get_temporary_buffer(ptrdiff_t n) noexcept; // deprecated in C++17, removed in C++20
186template <class T> void return_temporary_buffer(T* p) noexcept; // deprecated in C++17, removed in C++20
187
188template <class T> T* addressof(T& r) noexcept;
189template <class T> T* addressof(const T&& r) noexcept = delete;
190
191template <class InputIterator, class ForwardIterator>
192ForwardIterator
193uninitialized_copy(InputIterator first, InputIterator last, ForwardIterator result);
194
195namespace ranges {
196
197template<class InputIterator, class OutputIterator>
198using uninitialized_copy_result = in_out_result<InputIterator, OutputIterator>; // since C++20
199
200template<input_iterator InputIterator, sentinel-for<InputIterator> Sentinel1, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<OutputIterator> Sentinel2>
201 requires constructible_from<iter_value_t<OutputIterator>, iter_reference_t<InputIterator>>
202uninitialized_copy_result<InputIterator, OutputIterator>
203uninitialized_copy(InputIterator ifirst, Sentinel1 ilast, OutputIterator ofirst, Sentinel2 olast); // since C++20
204
205template<input_range InputRange, nothrow-forward-range OutputRange>
206 requires constructible_from<range_value_t<OutputRange>, range_reference_t<InputRange>>
207uninitialized_copy_result<borrowed_iterator_t<InputRange>, borrowed_iterator_t<OutputRange>>
208uninitialized_copy(InputRange&& in_range, OutputRange&& out_range); // since C++20
209
210}
211
212template <class InputIterator, class Size, class ForwardIterator>
213ForwardIterator
214uninitialized_copy_n(InputIterator first, Size n, ForwardIterator result);
215
216namespace ranges {
217
218template<class InputIterator, class OutputIterator>
219using uninitialized_copy_n_result = in_out_result<InputIterator, OutputIterator>; // since C++20
220
221template<input_iterator InputIterator, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<OutputIterator> Sentinel>
222 requires constructible_from<iter_value_t<OutputIterator>, iter_reference_t<InputIterator>>
223uninitialized_copy_n_result<InputIterator, OutputIterator>
224uninitialized_copy_n(InputIterator ifirst, iter_difference_t<InputIterator> n, OutputIterator ofirst, Sentinel olast); // since C++20
225
226}
227
228template <class ForwardIterator, class T>
229void uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x);
230
231namespace ranges {
232
233template <nothrow-forward-iterator ForwardIterator, nothrow-sentinel-for<ForwardIterator> Sentinel, class T>
234 requires constructible_from<iter_value_t<ForwardIterator>, const T&>
235ForwardIterator uninitialized_fill(ForwardIterator first, Sentinel last, const T& x); // since C++20
236
237template <nothrow-forward-range ForwardRange, class T>
238 requires constructible_from<range_value_t<ForwardRange>, const T&>
239borrowed_iterator_t<ForwardRange> uninitialized_fill(ForwardRange&& range, const T& x); // since C++20
240
241}
242
243template <class ForwardIterator, class Size, class T>
244ForwardIterator
245uninitialized_fill_n(ForwardIterator first, Size n, const T& x);
246
247namespace ranges {
248
249template <nothrow-forward-iterator ForwardIterator, class T>
250 requires constructible_from<iter_value_t<ForwardIterator>, const T&>
251ForwardIterator uninitialized_fill_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); // since C++20
252
253}
254
255template <class T, class ...Args>
256constexpr T* construct_at(T* location, Args&& ...args); // since C++20
257
258namespace ranges {
259 template<class T, class... Args>
260 constexpr T* construct_at(T* location, Args&&... args); // since C++20
261}
262
263template <class T>
264void destroy_at(T* location); // constexpr in C++20
265
266namespace ranges {
267 template<destructible T>
268 constexpr void destroy_at(T* location) noexcept; // since C++20
269}
270
271template <class ForwardIterator>
272void destroy(ForwardIterator first, ForwardIterator last); // constexpr in C++20
273
274namespace ranges {
275 template<nothrow-input-iterator InputIterator, nothrow-sentinel-for<InputIterator> Sentinel>
276 requires destructible<iter_value_t<InputIterator>>
277 constexpr InputIterator destroy(InputIterator first, Sentinel last) noexcept; // since C++20
278 template<nothrow-input-range InputRange>
279 requires destructible<range_value_t<InputRange>>
280 constexpr borrowed_iterator_t<InputRange> destroy(InputRange&& range) noexcept; // since C++20
281}
282
283template <class ForwardIterator, class Size>
284ForwardIterator destroy_n(ForwardIterator first, Size n); // constexpr in C++20
285
286namespace ranges {
287 template<nothrow-input-iterator InputIterator>
288 requires destructible<iter_value_t<InputIterator>>
289 constexpr InputIterator destroy_n(InputIterator first, iter_difference_t<InputIterator> n) noexcept; // since C++20
290}
291
292template <class InputIterator, class ForwardIterator>
293 ForwardIterator uninitialized_move(InputIterator first, InputIterator last, ForwardIterator result);
294
295namespace ranges {
296
297template<class InputIterator, class OutputIterator>
298using uninitialized_move_result = in_out_result<InputIterator, OutputIterator>; // since C++20
299
300template <input_iterator InputIterator, sentinel_for<InputIterator> Sentinel1, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<O> Sentinel2>
301 requires constructible_from<iter_value_t<OutputIterator>, iter_rvalue_reference_t<InputIterator>>
302uninitialized_move_result<InputIterator, OutputIterator>
303uninitialized_move(InputIterator ifirst, Sentinel1 ilast, OutputIterator ofirst, Sentinel2 olast); // since C++20
304
305template<input_range InputRange, nothrow-forward-range OutputRange>
306 requires constructible_from<range_value_t<OutputRange>, range_rvalue_reference_t<InputRange>>
307uninitialized_move_result<borrowed_iterator_t<InputRange>, borrowed_iterator_t<OutputRange>>
308uninitialized_move(InputRange&& in_range, OutputRange&& out_range); // since C++20
309
310}
311
312template <class InputIterator, class Size, class ForwardIterator>
313 pair<InputIterator,ForwardIterator> uninitialized_move_n(InputIterator first, Size n, ForwardIterator result);
314
315namespace ranges {
316
317template<class InputIterator, class OutputIterator>
318using uninitialized_move_n_result = in_out_result<InputIterator, OutputIterator>; // since C++20
319
320template<input_iterator InputIterator, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<OutputIterator> Sentinel>
321 requires constructible_from<iter_value_t<OutputIterator>, iter_rvalue_reference_t<InputIterator>>
322uninitialized_move_n_result<InputIterator, OutputIterator>
323uninitialized_move_n(InputIterator ifirst, iter_difference_t<InputIterator> n, OutputIterator ofirst, Sentinel olast); // since C++20
324
325}
326
327template <class ForwardIterator>
328 void uninitialized_value_construct(ForwardIterator first, ForwardIterator last);
329
330namespace ranges {
331
332template <nothrow-forward-iterator ForwardIterator, nothrow-sentinel-for<ForwardIterator> Sentinel>
333 requires default_initializable<iter_value_t<ForwardIterator>>
334 ForwardIterator uninitialized_value_construct(ForwardIterator first, Sentinel last); // since C++20
335
336template <nothrow-forward-range ForwardRange>
337 requires default_initializable<range_value_t<ForwardRange>>
338 borrowed_iterator_t<ForwardRange> uninitialized_value_construct(ForwardRange&& r); // since C++20
339
340}
341
342template <class ForwardIterator, class Size>
343 ForwardIterator uninitialized_value_construct_n(ForwardIterator first, Size n);
344
345namespace ranges {
346
347template <nothrow-forward-iterator ForwardIterator>
348 requires default_initializable<iter_value_t<ForwardIterator>>
349 ForwardIterator uninitialized_value_construct_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); // since C++20
350
351}
352
353template <class ForwardIterator>
354 void uninitialized_default_construct(ForwardIterator first, ForwardIterator last);
355
356namespace ranges {
357
358template <nothrow-forward-iterator ForwardIterator, nothrow-sentinel-for<ForwardIterator> Sentinel>
359 requires default_initializable<iter_value_t<ForwardIterator>>
360 ForwardIterator uninitialized_default_construct(ForwardIterator first, Sentinel last); // since C++20
361
362template <nothrow-forward-range ForwardRange>
363 requires default_initializable<range_value_t<ForwardRange>>
364 borrowed_iterator_t<ForwardRange> uninitialized_default_construct(ForwardRange&& r); // since C++20
365
366}
367
368template <class ForwardIterator, class Size>
369 ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n);
370
371namespace ranges {
372
373template <nothrow-forward-iterator ForwardIterator>
374 requires default_initializable<iter_value_t<ForwardIterator>>
375 ForwardIterator uninitialized_default_construct_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); // since C++20
376
377}
378
379template <class Y> struct auto_ptr_ref {}; // deprecated in C++11, removed in C++17
380
381template<class X>
382class auto_ptr // deprecated in C++11, removed in C++17
383{
384public:
385 typedef X element_type;
386
387 explicit auto_ptr(X* p =0) throw();
388 auto_ptr(auto_ptr&) throw();
389 template<class Y> auto_ptr(auto_ptr<Y>&) throw();
390 auto_ptr& operator=(auto_ptr&) throw();
391 template<class Y> auto_ptr& operator=(auto_ptr<Y>&) throw();
392 auto_ptr& operator=(auto_ptr_ref<X> r) throw();
393 ~auto_ptr() throw();
394
395 typename add_lvalue_reference<X>::type operator*() const throw();
396 X* operator->() const throw();
397 X* get() const throw();
398 X* release() throw();
399 void reset(X* p =0) throw();
400
401 auto_ptr(auto_ptr_ref<X>) throw();
402 template<class Y> operator auto_ptr_ref<Y>() throw();
403 template<class Y> operator auto_ptr<Y>() throw();
404};
405
406template <class T>
407struct default_delete
408{
409 constexpr default_delete() noexcept = default;
410 template <class U> constexpr default_delete(const default_delete<U>&) noexcept; // constexpr since C++23
411
412 constexpr void operator()(T*) const noexcept; // constexpr since C++23
413};
414
415template <class T>
416struct default_delete<T[]>
417{
418 constexpr default_delete() noexcept = default;
419 template <class U> constexpr default_delete(const default_delete <U[]>&) noexcept; // constexpr since C++23
420 constexpr void operator()(T*) const noexcept; // constexpr since C++23
421 template <class U> void operator()(U*) const = delete;
422};
423
424template <class T, class D = default_delete<T>>
425class unique_ptr
426{
427public:
428 typedef see below pointer;
429 typedef T element_type;
430 typedef D deleter_type;
431
432 // constructors
433 constexpr unique_ptr() noexcept;
434 constexpr explicit unique_ptr(pointer p) noexcept; // constexpr since C++23
435 constexpr unique_ptr(pointer p, see below d1) noexcept; // constexpr since C++23
436 constexpr unique_ptr(pointer p, see below d2) noexcept; // constexpr since C++23
437 constexpr unique_ptr(unique_ptr&& u) noexcept; // constexpr since C++23
438 constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
439 template <class U, class E>
440 constexpr unique_ptr(unique_ptr<U, E>&& u) noexcept; // constexpr since C++23
441 template <class U>
442 unique_ptr(auto_ptr<U>&& u) noexcept; // removed in C++17
443
444 // destructor
445 constexpr ~unique_ptr(); // constexpr since C++23
446
447 // assignment
448 constexpr unique_ptr& operator=(unique_ptr&& u) noexcept; // constexpr since C++23
449 template <class U, class E>
450 constexpr unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept; // constexpr since C++23
451 constexpr unique_ptr& operator=(nullptr_t) noexcept; // constexpr since C++23
452
453 // observers
454 constexpr
455 add_lvalue_reference<T>::type operator*() const noexcept(see below); // constexpr since C++23
456 constexpr pointer operator->() const noexcept; // constexpr since C++23
457 constexpr pointer get() const noexcept; // constexpr since C++23
458 constexpr deleter_type& get_deleter() noexcept; // constexpr since C++23
459 constexpr const deleter_type& get_deleter() const noexcept; // constexpr since C++23
460 constexpr explicit operator bool() const noexcept; // constexpr since C++23
461
462 // modifiers
463 constexpr pointer release() noexcept; // constexpr since C++23
464 constexpr void reset(pointer p = pointer()) noexcept; // constexpr since C++23
465 constexpr void swap(unique_ptr& u) noexcept; // constexpr since C++23
466};
467
468template <class T, class D>
469class unique_ptr<T[], D>
470{
471public:
472 typedef implementation-defined pointer;
473 typedef T element_type;
474 typedef D deleter_type;
475
476 // constructors
477 constexpr unique_ptr() noexcept;
478 constexpr explicit unique_ptr(pointer p) noexcept; // constexpr since C++23
479 constexpr unique_ptr(pointer p, see below d) noexcept; // constexpr since C++23
480 constexpr unique_ptr(pointer p, see below d) noexcept; // constexpr since C++23
481 constexpr unique_ptr(unique_ptr&& u) noexcept; // constexpr since C++23
482 template <class U, class E>
483 constexpr unique_ptr(unique_ptr <U, E>&& u) noexcept; // constexpr since C++23
484 constexpr unique_ptr(nullptr_t) noexcept : unique_ptr() { }
485
486 // destructor
487 constexpr ~unique_ptr(); // constexpr since C++23
488
489 // assignment
490 constexpr unique_ptr& operator=(unique_ptr&& u) noexcept; // constexpr since C++23
491 template <class U, class E>
492 constexpr unique_ptr& operator=(unique_ptr <U, E>&& u) noexcept; // constexpr since C++23
493 constexpr unique_ptr& operator=(nullptr_t) noexcept; // constexpr since C++23
494
495 // observers
496 constexpr T& operator[](size_t i) const; // constexpr since C++23
497 constexpr pointer get() const noexcept; // constexpr since C++23
498 constexpr deleter_type& get_deleter() noexcept; // constexpr since C++23
499 constexpr const deleter_type& get_deleter() const noexcept; // constexpr since C++23
500 constexpr explicit operator bool() const noexcept; // constexpr since C++23
501
502 // modifiers
503 constexpr pointer release() noexcept; // constexpr since C++23
504 constexpr void reset(pointer p = pointer()) noexcept; // constexpr since C++23
505 constexpr void reset(nullptr_t) noexcept; // constexpr since C++23
506 template <class U> void reset(U) = delete;
507 constexpr void swap(unique_ptr& u) noexcept; // constexpr since C++23
508};
509
510template <class T, class D>
511 constexpr void swap(unique_ptr<T, D>& x, unique_ptr<T, D>& y) noexcept; // constexpr since C++23
512
513template <class T1, class D1, class T2, class D2>
514 constexpr bool operator==(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); // constexpr since C++23
515template <class T1, class D1, class T2, class D2>
516 bool operator!=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); // removed in C++20
517template <class T1, class D1, class T2, class D2>
518 bool operator<(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
519template <class T1, class D1, class T2, class D2>
520 bool operator<=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
521template <class T1, class D1, class T2, class D2>
522 bool operator>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
523template <class T1, class D1, class T2, class D2>
524 bool operator>=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
525template<class T1, class D1, class T2, class D2>
526 requires three_way_comparable_with<typename unique_ptr<T1, D1>::pointer,
527 typename unique_ptr<T2, D2>::pointer>
528 compare_three_way_result_t<typename unique_ptr<T1, D1>::pointer,
529 typename unique_ptr<T2, D2>::pointer>
530 operator<=>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); // C++20
531
532template <class T, class D>
533 constexpr bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept; // constexpr since C++23
534template <class T, class D>
535 bool operator==(nullptr_t, const unique_ptr<T, D>& y) noexcept; // removed in C++20
536template <class T, class D>
537 bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept; // removed in C++20
538template <class T, class D>
539 bool operator!=(nullptr_t, const unique_ptr<T, D>& y) noexcept; // removed in C++20
540
541template <class T, class D>
542 constexpr bool operator<(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
543template <class T, class D>
544 constexpr bool operator<(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
545template <class T, class D>
546 constexpr bool operator<=(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
547template <class T, class D>
548 constexpr bool operator<=(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
549template <class T, class D>
550 constexpr bool operator>(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
551template <class T, class D>
552 constexpr bool operator>(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
553template <class T, class D>
554 constexpr bool operator>=(const unique_ptr<T, D>& x, nullptr_t); // constexpr since C++23
555template <class T, class D>
556 constexpr bool operator>=(nullptr_t, const unique_ptr<T, D>& y); // constexpr since C++23
557template<class T, class D>
558 requires three_way_comparable<typename unique_ptr<T, D>::pointer>
559 compare_three_way_result_t<typename unique_ptr<T, D>::pointer>
560 constexpr operator<=>(const unique_ptr<T, D>& x, nullptr_t); // C++20, constexpr since C++23
561
562class bad_weak_ptr
563 : public std::exception
564{
565 bad_weak_ptr() noexcept;
566};
567
568template<class T, class... Args>
569constexpr unique_ptr<T> make_unique(Args&&... args); // C++14, constexpr since C++23
570template<class T>
571constexpr unique_ptr<T> make_unique(size_t n); // C++14, constexpr since C++23
572template<class T, class... Args> unspecified make_unique(Args&&...) = delete; // C++14, T == U[N]
573
574template<class T>
575 constexpr unique_ptr<T> make_unique_for_overwrite(); // T is not array, C++20, constexpr since C++23
576template<class T>
577 constexpr unique_ptr<T> make_unique_for_overwrite(size_t n); // T is U[], C++20, constexpr since C++23
578template<class T, class... Args>
579 unspecified make_unique_for_overwrite(Args&&...) = delete; // T is U[N], C++20
580
581template<class E, class T, class Y, class D>
582 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, unique_ptr<Y, D> const& p);
583
584template<class T>
585class shared_ptr
586{
587public:
588 typedef T element_type; // until C++17
589 typedef remove_extent_t<T> element_type; // since C++17
590 typedef weak_ptr<T> weak_type; // C++17
591
592 // constructors:
593 constexpr shared_ptr() noexcept;
594 template<class Y> explicit shared_ptr(Y* p);
595 template<class Y, class D> shared_ptr(Y* p, D d);
596 template<class Y, class D, class A> shared_ptr(Y* p, D d, A a);
597 template <class D> shared_ptr(nullptr_t p, D d);
598 template <class D, class A> shared_ptr(nullptr_t p, D d, A a);
599 template<class Y> shared_ptr(const shared_ptr<Y>& r, T *p) noexcept;
600 shared_ptr(const shared_ptr& r) noexcept;
601 template<class Y> shared_ptr(const shared_ptr<Y>& r) noexcept;
602 shared_ptr(shared_ptr&& r) noexcept;
603 template<class Y> shared_ptr(shared_ptr<Y>&& r) noexcept;
604 template<class Y> explicit shared_ptr(const weak_ptr<Y>& r);
605 template<class Y> shared_ptr(auto_ptr<Y>&& r); // removed in C++17
606 template <class Y, class D> shared_ptr(unique_ptr<Y, D>&& r);
607 shared_ptr(nullptr_t) : shared_ptr() { }
608
609 // destructor:
610 ~shared_ptr();
611
612 // assignment:
613 shared_ptr& operator=(const shared_ptr& r) noexcept;
614 template<class Y> shared_ptr& operator=(const shared_ptr<Y>& r) noexcept;
615 shared_ptr& operator=(shared_ptr&& r) noexcept;
616 template<class Y> shared_ptr& operator=(shared_ptr<Y>&& r);
617 template<class Y> shared_ptr& operator=(auto_ptr<Y>&& r); // removed in C++17
618 template <class Y, class D> shared_ptr& operator=(unique_ptr<Y, D>&& r);
619
620 // modifiers:
621 void swap(shared_ptr& r) noexcept;
622 void reset() noexcept;
623 template<class Y> void reset(Y* p);
624 template<class Y, class D> void reset(Y* p, D d);
625 template<class Y, class D, class A> void reset(Y* p, D d, A a);
626
627 // observers:
628 T* get() const noexcept;
629 T& operator*() const noexcept;
630 T* operator->() const noexcept;
631 long use_count() const noexcept;
632 bool unique() const noexcept; // deprected in C++17, removed in C++20
633 explicit operator bool() const noexcept;
634 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept;
635 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept;
636};
637
638template<class T>
639shared_ptr(weak_ptr<T>) -> shared_ptr<T>;
640template<class T, class D>
641shared_ptr(unique_ptr<T, D>) -> shared_ptr<T>;
642
643// shared_ptr comparisons:
644template<class T, class U>
645 bool operator==(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
646template<class T, class U>
647 bool operator!=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; // removed in C++20
648template<class T, class U>
649 bool operator<(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; // removed in C++20
650template<class T, class U>
651 bool operator>(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; // removed in C++20
652template<class T, class U>
653 bool operator<=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; // removed in C++20
654template<class T, class U>
655 bool operator>=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; // removed in C++20
656template<class T, class U>
657 strong_ordering operator<=>(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; // C++20
658
659template <class T>
660 bool operator==(const shared_ptr<T>& x, nullptr_t) noexcept;
661template <class T>
662 bool operator==(nullptr_t, const shared_ptr<T>& y) noexcept; // removed in C++20
663template <class T>
664 bool operator!=(const shared_ptr<T>& x, nullptr_t) noexcept; // removed in C++20
665template <class T>
666 bool operator!=(nullptr_t, const shared_ptr<T>& y) noexcept; // removed in C++20
667template <class T>
668 bool operator<(const shared_ptr<T>& x, nullptr_t) noexcept; // removed in C++20
669template <class T>
670 bool operator<(nullptr_t, const shared_ptr<T>& y) noexcept; // removed in C++20
671template <class T>
672 bool operator<=(const shared_ptr<T>& x, nullptr_t) noexcept; // removed in C++20
673template <class T>
674 bool operator<=(nullptr_t, const shared_ptr<T>& y) noexcept; // removed in C++20
675template <class T>
676 bool operator>(const shared_ptr<T>& x, nullptr_t) noexcept; // removed in C++20
677template <class T>
678 bool operator>(nullptr_t, const shared_ptr<T>& y) noexcept; // removed in C++20
679template <class T>
680 bool operator>=(const shared_ptr<T>& x, nullptr_t) noexcept; // removed in C++20
681template <class T>
682 bool operator>=(nullptr_t, const shared_ptr<T>& y) noexcept; // removed in C++20
683template<class T>
684 strong_ordering operator<=>(shared_ptr<T> const& x, nullptr_t) noexcept; // C++20
685
686// shared_ptr specialized algorithms:
687template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b) noexcept;
688
689// shared_ptr casts:
690template<class T, class U>
691 shared_ptr<T> static_pointer_cast(shared_ptr<U> const& r) noexcept;
692template<class T, class U>
693 shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const& r) noexcept;
694template<class T, class U>
695 shared_ptr<T> const_pointer_cast(shared_ptr<U> const& r) noexcept;
696
697// shared_ptr I/O:
698template<class E, class T, class Y>
699 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, shared_ptr<Y> const& p);
700
701// shared_ptr get_deleter:
702template<class D, class T> D* get_deleter(shared_ptr<T> const& p) noexcept;
703
704template<class T, class... Args>
705 shared_ptr<T> make_shared(Args&&... args); // T is not an array
706template<class T, class A, class... Args>
707 shared_ptr<T> allocate_shared(const A& a, Args&&... args); // T is not an array
708
709template<class T>
710 shared_ptr<T> make_shared(size_t N); // T is U[] (since C++20)
711template<class T, class A>
712 shared_ptr<T> allocate_shared(const A& a, size_t N); // T is U[] (since C++20)
713
714template<class T>
715 shared_ptr<T> make_shared(); // T is U[N] (since C++20)
716template<class T, class A>
717 shared_ptr<T> allocate_shared(const A& a); // T is U[N] (since C++20)
718
719template<class T>
720 shared_ptr<T> make_shared(size_t N, const remove_extent_t<T>& u); // T is U[] (since C++20)
721template<class T, class A>
722 shared_ptr<T> allocate_shared(const A& a, size_t N, const remove_extent_t<T>& u); // T is U[] (since C++20)
723
724template<class T> shared_ptr<T>
725 make_shared(const remove_extent_t<T>& u); // T is U[N] (since C++20)
726template<class T, class A>
727 shared_ptr<T> allocate_shared(const A& a, const remove_extent_t<T>& u); // T is U[N] (since C++20)
728
729template<class T>
730 shared_ptr<T> make_shared_for_overwrite(); // T is not U[], C++20
731template<class T, class A>
732 shared_ptr<T> allocate_shared_for_overwrite(const A& a); // T is not U[], C++20
733
734template<class T>
735 shared_ptr<T> make_shared_for_overwrite(size_t N); // T is U[], C++20
736template<class T, class A>
737 shared_ptr<T> allocate_shared_for_overwrite(const A& a, size_t N); // T is U[], C++20
738
739template<class T>
740class weak_ptr
741{
742public:
743 typedef T element_type; // until C++17
744 typedef remove_extent_t<T> element_type; // since C++17
745
746 // constructors
747 constexpr weak_ptr() noexcept;
748 template<class Y> weak_ptr(shared_ptr<Y> const& r) noexcept;
749 weak_ptr(weak_ptr const& r) noexcept;
750 template<class Y> weak_ptr(weak_ptr<Y> const& r) noexcept;
751 weak_ptr(weak_ptr&& r) noexcept; // C++14
752 template<class Y> weak_ptr(weak_ptr<Y>&& r) noexcept; // C++14
753
754 // destructor
755 ~weak_ptr();
756
757 // assignment
758 weak_ptr& operator=(weak_ptr const& r) noexcept;
759 template<class Y> weak_ptr& operator=(weak_ptr<Y> const& r) noexcept;
760 template<class Y> weak_ptr& operator=(shared_ptr<Y> const& r) noexcept;
761 weak_ptr& operator=(weak_ptr&& r) noexcept; // C++14
762 template<class Y> weak_ptr& operator=(weak_ptr<Y>&& r) noexcept; // C++14
763
764 // modifiers
765 void swap(weak_ptr& r) noexcept;
766 void reset() noexcept;
767
768 // observers
769 long use_count() const noexcept;
770 bool expired() const noexcept;
771 shared_ptr<T> lock() const noexcept;
772 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept;
773 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept;
774};
775
776template<class T>
777weak_ptr(shared_ptr<T>) -> weak_ptr<T>;
778
779// weak_ptr specialized algorithms:
780template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) noexcept;
781
782// class owner_less:
783template<class T> struct owner_less;
784
785template<class T>
786struct owner_less<shared_ptr<T> >
787 : binary_function<shared_ptr<T>, shared_ptr<T>, bool>
788{
789 typedef bool result_type;
790 bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const noexcept;
791 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept;
792 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept;
793};
794
795template<class T>
796struct owner_less<weak_ptr<T> >
797 : binary_function<weak_ptr<T>, weak_ptr<T>, bool>
798{
799 typedef bool result_type;
800 bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const noexcept;
801 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept;
802 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept;
803};
804
805template <> // Added in C++14
806struct owner_less<void>
807{
808 template <class _Tp, class _Up>
809 bool operator()( shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept;
810 template <class _Tp, class _Up>
811 bool operator()( shared_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept;
812 template <class _Tp, class _Up>
813 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept;
814 template <class _Tp, class _Up>
815 bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept;
816
817 typedef void is_transparent;
818};
819
820template<class T>
821class enable_shared_from_this
822{
823protected:
824 constexpr enable_shared_from_this() noexcept;
825 enable_shared_from_this(enable_shared_from_this const&) noexcept;
826 enable_shared_from_this& operator=(enable_shared_from_this const&) noexcept;
827 ~enable_shared_from_this();
828public:
829 shared_ptr<T> shared_from_this();
830 shared_ptr<T const> shared_from_this() const;
831};
832
833template<class T>
834 bool atomic_is_lock_free(const shared_ptr<T>* p);
835template<class T>
836 shared_ptr<T> atomic_load(const shared_ptr<T>* p);
837template<class T>
838 shared_ptr<T> atomic_load_explicit(const shared_ptr<T>* p, memory_order mo);
839template<class T>
840 void atomic_store(shared_ptr<T>* p, shared_ptr<T> r);
841template<class T>
842 void atomic_store_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo);
843template<class T>
844 shared_ptr<T> atomic_exchange(shared_ptr<T>* p, shared_ptr<T> r);
845template<class T>
846 shared_ptr<T>
847 atomic_exchange_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo);
848template<class T>
849 bool
850 atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w);
851template<class T>
852 bool
853 atomic_compare_exchange_strong( shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w);
854template<class T>
855 bool
856 atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
857 shared_ptr<T> w, memory_order success,
858 memory_order failure);
859template<class T>
860 bool
861 atomic_compare_exchange_strong_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
862 shared_ptr<T> w, memory_order success,
863 memory_order failure);
864// Hash support
865template <class T> struct hash;
866template <class T, class D> struct hash<unique_ptr<T, D> >;
867template <class T> struct hash<shared_ptr<T> >;
868
869template <class T, class Alloc>
870 inline constexpr bool uses_allocator_v = uses_allocator<T, Alloc>::value;
871
872// [allocator.uses.construction], uses-allocator construction
873template<class T, class Alloc, class... Args>
874 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
875 Args&&... args) noexcept;
876template<class T, class Alloc, class Tuple1, class Tuple2>
877 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
878 piecewise_construct_t,
879 Tuple1&& x, Tuple2&& y) noexcept;
880template<class T, class Alloc>
881 constexpr auto uses_allocator_construction_args(const Alloc& alloc) noexcept; // since C++20
882template<class T, class Alloc, class U, class V>
883 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
884 U&& u, V&& v) noexcept;
885template<class T, class Alloc, class U, class V>
886 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++23
887 pair<U, V>& pr) noexcept;
888template<class T, class Alloc, class U, class V>
889 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
890 const pair<U, V>& pr) noexcept;
891template<class T, class Alloc, class U, class V>
892 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
893 pair<U, V>&& pr) noexcept;
894template<class T, class Alloc, class U, class V>
895 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++23
896 const pair<U, V>&& pr) noexcept;
897template<class T, class Alloc, pair-like P>
898 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
899 P&& p) noexcept;
900template<class T, class Alloc, class U>
901 constexpr auto uses_allocator_construction_args(const Alloc& alloc, // since C++20
902 U&& u) noexcept;
903template<class T, class Alloc, class... Args>
904 constexpr T make_obj_using_allocator(const Alloc& alloc, Args&&... args); // since C++20
905template<class T, class Alloc, class... Args>
906 constexpr T* uninitialized_construct_using_allocator(T* p, // since C++20
907 const Alloc& alloc, Args&&... args);
908
909// [ptr.align]
910void* align(size_t alignment, size_t size, void*& ptr, size_t& space);
911
912template<size_t N, class T>
913[[nodiscard]] constexpr T* assume_aligned(T* ptr); // since C++20
914
915template<size_t Alignment, class T>
916 bool is_sufficiently_aligned(T* ptr); // since C++26
917
918// [out.ptr.t], class template out_ptr_t
919template<class Smart, class Pointer, class... Args>
920 class out_ptr_t; // since c++23
921
922// [out.ptr], function template out_ptr
923template<class Pointer = void, class Smart, class... Args>
924 auto out_ptr(Smart& s, Args&&... args); // since c++23
925
926// [inout.ptr.t], class template inout_ptr_t
927template<class Smart, class Pointer, class... Args>
928 class inout_ptr_t; // since c++23
929
930// [inout.ptr], function template inout_ptr
931template<class Pointer = void, class Smart, class... Args>
932 auto inout_ptr(Smart& s, Args&&... args); // since c++23
933
934} // std
935
936*/
937
938// clang-format on
939
940#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
941# include <__cxx03/memory>
942#else
943# include <__config>
944# include <__memory/addressof.h>
945# include <__memory/align.h>
946# include <__memory/allocator.h>
947# include <__memory/allocator_arg_t.h>
948# include <__memory/allocator_traits.h>
949# include <__memory/auto_ptr.h>
950# include <__memory/inout_ptr.h>
951# include <__memory/is_sufficiently_aligned.h>
952# include <__memory/out_ptr.h>
953# include <__memory/pointer_traits.h>
954# include <__memory/raw_storage_iterator.h>
955# include <__memory/shared_ptr.h>
956# include <__memory/temporary_buffer.h>
957# include <__memory/uninitialized_algorithms.h>
958# include <__memory/unique_ptr.h>
959# include <__memory/uses_allocator.h>
960
961// standard-mandated includes
962
963# if _LIBCPP_STD_VER >= 17
964# include <__memory/construct_at.h>
965# include <__memory/destroy.h>
966# endif
967
968# if _LIBCPP_STD_VER >= 20
969# include <__memory/assume_aligned.h>
970# include <__memory/concepts.h>
971# include <__memory/ranges_construct_at.h>
972# include <__memory/ranges_destroy.h>
973# include <__memory/ranges_uninitialized_algorithms.h>
974# include <__memory/uses_allocator_construction.h>
975# endif
976
977# if _LIBCPP_STD_VER >= 23
978# include <__memory/allocate_at_least.h>
979# endif
980
981# include <version>
982
983// [memory.syn]
984# include <compare>
985
986# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
987# pragma GCC system_header
988# endif
989
990# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
991# include <atomic>
992# include <concepts>
993# include <cstddef>
994# include <cstdint>
995# include <cstdlib>
996# include <cstring>
997# include <iosfwd>
998# include <iterator>
999# include <new>
1000# include <stdexcept>
1001# include <tuple>
1002# include <type_traits>
1003# include <typeinfo>
1004# include <utility>
1005# endif
1006#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
1007
1008#endif // _LIBCPP_MEMORY