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/*
14 memory synopsis
15
16namespace std
17{
18
19struct allocator_arg_t { };
20inline constexpr allocator_arg_t allocator_arg = allocator_arg_t();
21
22template <class T, class Alloc> struct uses_allocator;
23
24template <class Ptr>
25struct pointer_traits
26{
27 typedef Ptr pointer;
28 typedef <details> element_type;
29 typedef <details> difference_type;
30
31 template <class U> using rebind = <details>;
32
33 static pointer pointer_to(<details>);
34};
35
36template <class T>
37struct pointer_traits<T*>
38{
39 typedef T* pointer;
40 typedef T element_type;
41 typedef ptrdiff_t difference_type;
42
43 template <class U> using rebind = U*;
44
45 static pointer pointer_to(<details>) noexcept; // constexpr in C++20
46};
47
48template <class T> constexpr T* to_address(T* p) noexcept; // C++20
49template <class Ptr> constexpr auto to_address(const Ptr& p) noexcept; // C++20
50
51template <class Alloc>
52struct allocator_traits
53{
54 typedef Alloc allocator_type;
55 typedef typename allocator_type::value_type
56 value_type;
57
58 typedef Alloc::pointer | value_type* pointer;
59 typedef Alloc::const_pointer
60 | pointer_traits<pointer>::rebind<const value_type>
61 const_pointer;
62 typedef Alloc::void_pointer
63 | pointer_traits<pointer>::rebind<void>
64 void_pointer;
65 typedef Alloc::const_void_pointer
66 | pointer_traits<pointer>::rebind<const void>
67 const_void_pointer;
68 typedef Alloc::difference_type
69 | pointer_traits<pointer>::difference_type
70 difference_type;
71 typedef Alloc::size_type
72 | make_unsigned<difference_type>::type
73 size_type;
74 typedef Alloc::propagate_on_container_copy_assignment
75 | false_type propagate_on_container_copy_assignment;
76 typedef Alloc::propagate_on_container_move_assignment
77 | false_type propagate_on_container_move_assignment;
78 typedef Alloc::propagate_on_container_swap
79 | false_type propagate_on_container_swap;
80 typedef Alloc::is_always_equal
81 | is_empty is_always_equal;
82
83 template <class T> using rebind_alloc = Alloc::rebind<T>::other | Alloc<T, Args...>;
84 template <class T> using rebind_traits = allocator_traits<rebind_alloc<T>>;
85
86 static pointer allocate(allocator_type& a, size_type n); // constexpr and [[nodiscard]] in C++20
87 static pointer allocate(allocator_type& a, size_type n, const_void_pointer hint); // constexpr and [[nodiscard]] in C++20
88
89 static void deallocate(allocator_type& a, pointer p, size_type n) noexcept; // constexpr in C++20
90
91 template <class T, class... Args>
92 static void construct(allocator_type& a, T* p, Args&&... args); // constexpr in C++20
93
94 template <class T>
95 static void destroy(allocator_type& a, T* p); // constexpr in C++20
96
97 static size_type max_size(const allocator_type& a); // noexcept in C++14, constexpr in C++20
98 static allocator_type select_on_container_copy_construction(const allocator_type& a); // constexpr in C++20
99};
100
101template<class Pointer>
102struct allocation_result {
103 Pointer ptr;
104 size_t count;
105}; // since C++23
106
107template<class Allocator>
108[[nodiscard]] constexpr allocation_result<typename allocator_traits<Allocator>::pointer>
109 allocate_at_least(Allocator& a, size_t n); // since C++23
110
111template <>
112class allocator<void> // removed in C++20
113{
114public:
115 typedef void* pointer;
116 typedef const void* const_pointer;
117 typedef void value_type;
118
119 template <class _Up> struct rebind {typedef allocator<_Up> other;};
120};
121
122template <class T>
123class allocator
124{
125public:
126 typedef size_t size_type;
127 typedef ptrdiff_t difference_type;
128 typedef T* pointer; // deprecated in C++17, removed in C++20
129 typedef const T* const_pointer; // deprecated in C++17, removed in C++20
130 typedef typename add_lvalue_reference<T>::type
131 reference; // deprecated in C++17, removed in C++20
132 typedef typename add_lvalue_reference<const T>::type
133 const_reference; // deprecated in C++17, removed in C++20
134
135 typedef T value_type;
136
137 template <class U> struct rebind {typedef allocator<U> other;}; // deprecated in C++17, removed in C++20
138
139 typedef true_type propagate_on_container_move_assignment;
140 typedef true_type is_always_equal;
141
142 constexpr allocator() noexcept; // constexpr in C++20
143 constexpr allocator(const allocator&) noexcept; // constexpr in C++20
144 template <class U>
145 constexpr allocator(const allocator<U>&) noexcept; // constexpr in C++20
146 ~allocator(); // constexpr in C++20
147 pointer address(reference x) const noexcept; // deprecated in C++17, removed in C++20
148 const_pointer address(const_reference x) const noexcept; // deprecated in C++17, removed in C++20
149 T* allocate(size_t n, const void* hint); // deprecated in C++17, removed in C++20
150 T* allocate(size_t n); // constexpr in C++20
151 void deallocate(T* p, size_t n) noexcept; // constexpr in C++20
152 size_type max_size() const noexcept; // deprecated in C++17, removed in C++20
153 template<class U, class... Args>
154 void construct(U* p, Args&&... args); // deprecated in C++17, removed in C++20
155 template <class U>
156 void destroy(U* p); // deprecated in C++17, removed in C++20
157};
158
159template <class T, class U>
160bool operator==(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20
161
162template <class T, class U>
163bool operator!=(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20
164
165template <class OutputIterator, class T>
166class raw_storage_iterator // deprecated in C++17, removed in C++20
167 : public iterator<output_iterator_tag, void, void, void, void> // until C++17
168{
169public:
170 typedef output_iterator_tag iterator_category;
171 typedef void value_type;
172 typedef void difference_type; // until C++20
173 typedef ptrdiff_t difference_type; // since C++20
174 typedef void pointer;
175 typedef void reference;
176
177 explicit raw_storage_iterator(OutputIterator x);
178 raw_storage_iterator& operator*();
179 raw_storage_iterator& operator=(const T& element);
180 raw_storage_iterator& operator++();
181 raw_storage_iterator operator++(int);
182};
183
184template <class T> pair<T*,ptrdiff_t> get_temporary_buffer(ptrdiff_t n) noexcept;
185template <class T> void return_temporary_buffer(T* p) noexcept;
186
187template <class T> T* addressof(T& r) noexcept;
188template <class T> T* addressof(const T&& r) noexcept = delete;
189
190template <class InputIterator, class ForwardIterator>
191ForwardIterator
192uninitialized_copy(InputIterator first, InputIterator last, ForwardIterator result);
193
194namespace ranges {
195
196template<class InputIterator, class OutputIterator>
197using uninitialized_copy_result = in_out_result<InputIterator, OutputIterator>; // since C++20
198
199template<input_iterator InputIterator, sentinel-for<InputIterator> Sentinel1, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<OutputIterator> Sentinel2>
200 requires constructible_from<iter_value_t<OutputIterator>, iter_reference_t<InputIterator>>
201uninitialized_copy_result<InputIterator, OutputIterator>
202uninitialized_copy(InputIterator ifirst, Sentinel1 ilast, OutputIterator ofirst, Sentinel2 olast); // since C++20
203
204template<input_range InputRange, nothrow-forward-range OutputRange>
205 requires constructible_from<range_value_t<OutputRange>, range_reference_t<InputRange>>
206uninitialized_copy_result<borrowed_iterator_t<InputRange>, borrowed_iterator_t<OutputRange>>
207uninitialized_copy(InputRange&& in_range, OutputRange&& out_range); // since C++20
208
209}
210
211template <class InputIterator, class Size, class ForwardIterator>
212ForwardIterator
213uninitialized_copy_n(InputIterator first, Size n, ForwardIterator result);
214
215namespace ranges {
216
217template<class InputIterator, class OutputIterator>
218using uninitialized_copy_n_result = in_out_result<InputIterator, OutputIterator>; // since C++20
219
220template<input_iterator InputIterator, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<OutputIterator> Sentinel>
221 requires constructible_from<iter_value_t<OutputIterator>, iter_reference_t<InputIterator>>
222uninitialized_copy_n_result<InputIterator, OutputIterator>
223uninitialized_copy_n(InputIterator ifirst, iter_difference_t<InputIterator> n, OutputIterator ofirst, Sentinel olast); // since C++20
224
225}
226
227template <class ForwardIterator, class T>
228void uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x);
229
230namespace ranges {
231
232template <nothrow-forward-iterator ForwardIterator, nothrow-sentinel-for<ForwardIterator> Sentinel, class T>
233 requires constructible_from<iter_value_t<ForwardIterator>, const T&>
234ForwardIterator uninitialized_fill(ForwardIterator first, Sentinel last, const T& x); // since C++20
235
236template <nothrow-forward-range ForwardRange, class T>
237 requires constructible_from<range_value_t<ForwardRange>, const T&>
238borrowed_iterator_t<ForwardRange> uninitialized_fill(ForwardRange&& range, const T& x); // since C++20
239
240}
241
242template <class ForwardIterator, class Size, class T>
243ForwardIterator
244uninitialized_fill_n(ForwardIterator first, Size n, const T& x);
245
246namespace ranges {
247
248template <nothrow-forward-iterator ForwardIterator, class T>
249 requires constructible_from<iter_value_t<ForwardIterator>, const T&>
250ForwardIterator uninitialized_fill_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); // since C++20
251
252}
253
254template <class T, class ...Args>
255constexpr T* construct_at(T* location, Args&& ...args); // since C++20
256
257namespace ranges {
258 template<class T, class... Args>
259 constexpr T* construct_at(T* location, Args&&... args); // since C++20
260}
261
262template <class T>
263void destroy_at(T* location); // constexpr in C++20
264
265namespace ranges {
266 template<destructible T>
267 constexpr void destroy_at(T* location) noexcept; // since C++20
268}
269
270template <class ForwardIterator>
271void destroy(ForwardIterator first, ForwardIterator last); // constexpr in C++20
272
273namespace ranges {
274 template<nothrow-input-iterator InputIterator, nothrow-sentinel-for<InputIterator> Sentinel>
275 requires destructible<iter_value_t<InputIterator>>
276 constexpr InputIterator destroy(InputIterator first, Sentinel last) noexcept; // since C++20
277 template<nothrow-input-range InputRange>
278 requires destructible<range_value_t<InputRange>>
279 constexpr borrowed_iterator_t<InputRange> destroy(InputRange&& range) noexcept; // since C++20
280}
281
282template <class ForwardIterator, class Size>
283ForwardIterator destroy_n(ForwardIterator first, Size n); // constexpr in C++20
284
285namespace ranges {
286 template<nothrow-input-iterator InputIterator>
287 requires destructible<iter_value_t<InputIterator>>
288 constexpr InputIterator destroy_n(InputIterator first, iter_difference_t<InputIterator> n) noexcept; // since C++20
289}
290
291template <class InputIterator, class ForwardIterator>
292 ForwardIterator uninitialized_move(InputIterator first, InputIterator last, ForwardIterator result);
293
294namespace ranges {
295
296template<class InputIterator, class OutputIterator>
297using uninitialized_move_result = in_out_result<InputIterator, OutputIterator>; // since C++20
298
299template <input_iterator InputIterator, sentinel_for<InputIterator> Sentinel1, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<O> Sentinel2>
300 requires constructible_from<iter_value_t<OutputIterator>, iter_rvalue_reference_t<InputIterator>>
301uninitialized_move_result<InputIterator, OutputIterator>
302uninitialized_move(InputIterator ifirst, Sentinel1 ilast, OutputIterator ofirst, Sentinel2 olast); // since C++20
303
304template<input_range InputRange, nothrow-forward-range OutputRange>
305 requires constructible_from<range_value_t<OutputRange>, range_rvalue_reference_t<InputRange>>
306uninitialized_move_result<borrowed_iterator_t<InputRange>, borrowed_iterator_t<OutputRange>>
307uninitialized_move(InputRange&& in_range, OutputRange&& out_range); // since C++20
308
309}
310
311template <class InputIterator, class Size, class ForwardIterator>
312 pair<InputIterator,ForwardIterator> uninitialized_move_n(InputIterator first, Size n, ForwardIterator result);
313
314namespace ranges {
315
316template<class InputIterator, class OutputIterator>
317using uninitialized_move_n_result = in_out_result<InputIterator, OutputIterator>; // since C++20
318
319template<input_iterator InputIterator, nothrow-forward-iterator OutputIterator, nothrow-sentinel-for<OutputIterator> Sentinel>
320 requires constructible_from<iter_value_t<OutputIterator>, iter_rvalue_reference_t<InputIterator>>
321uninitialized_move_n_result<InputIterator, OutputIterator>
322uninitialized_move_n(InputIterator ifirst, iter_difference_t<InputIterator> n, OutputIterator ofirst, Sentinel olast); // since C++20
323
324}
325
326template <class ForwardIterator>
327 void uninitialized_value_construct(ForwardIterator first, ForwardIterator last);
328
329namespace ranges {
330
331template <nothrow-forward-iterator ForwardIterator, nothrow-sentinel-for<ForwardIterator> Sentinel>
332 requires default_initializable<iter_value_t<ForwardIterator>>
333 ForwardIterator uninitialized_value_construct(ForwardIterator first, Sentinel last); // since C++20
334
335template <nothrow-forward-range ForwardRange>
336 requires default_initializable<range_value_t<ForwardRange>>
337 borrowed_iterator_t<ForwardRange> uninitialized_value_construct(ForwardRange&& r); // since C++20
338
339}
340
341template <class ForwardIterator, class Size>
342 ForwardIterator uninitialized_value_construct_n(ForwardIterator first, Size n);
343
344namespace ranges {
345
346template <nothrow-forward-iterator ForwardIterator>
347 requires default_initializable<iter_value_t<ForwardIterator>>
348 ForwardIterator uninitialized_value_construct_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); // since C++20
349
350}
351
352template <class ForwardIterator>
353 void uninitialized_default_construct(ForwardIterator first, ForwardIterator last);
354
355namespace ranges {
356
357template <nothrow-forward-iterator ForwardIterator, nothrow-sentinel-for<ForwardIterator> Sentinel>
358 requires default_initializable<iter_value_t<ForwardIterator>>
359 ForwardIterator uninitialized_default_construct(ForwardIterator first, Sentinel last); // since C++20
360
361template <nothrow-forward-range ForwardRange>
362 requires default_initializable<range_value_t<ForwardRange>>
363 borrowed_iterator_t<ForwardRange> uninitialized_default_construct(ForwardRange&& r); // since C++20
364
365}
366
367template <class ForwardIterator, class Size>
368 ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n);
369
370namespace ranges {
371
372template <nothrow-forward-iterator ForwardIterator>
373 requires default_initializable<iter_value_t<ForwardIterator>>
374 ForwardIterator uninitialized_default_construct_n(ForwardIterator first, iter_difference_t<ForwardIterator> n); // since C++20
375
376}
377
378template <class Y> struct auto_ptr_ref {}; // deprecated in C++11, removed in C++17
379
380template<class X>
381class auto_ptr // deprecated in C++11, removed in C++17
382{
383public:
384 typedef X element_type;
385
386 explicit auto_ptr(X* p =0) throw();
387 auto_ptr(auto_ptr&) throw();
388 template<class Y> auto_ptr(auto_ptr<Y>&) throw();
389 auto_ptr& operator=(auto_ptr&) throw();
390 template<class Y> auto_ptr& operator=(auto_ptr<Y>&) throw();
391 auto_ptr& operator=(auto_ptr_ref<X> r) throw();
392 ~auto_ptr() throw();
393
394 typename add_lvalue_reference<X>::type operator*() const throw();
395 X* operator->() const throw();
396 X* get() const throw();
397 X* release() throw();
398 void reset(X* p =0) throw();
399
400 auto_ptr(auto_ptr_ref<X>) throw();
401 template<class Y> operator auto_ptr_ref<Y>() throw();
402 template<class Y> operator auto_ptr<Y>() throw();
403};
404
405template <class T>
406struct default_delete
407{
408 constexpr default_delete() noexcept = default;
409 template <class U> default_delete(const default_delete<U>&) noexcept;
410
411 void operator()(T*) const noexcept;
412};
413
414template <class T>
415struct default_delete<T[]>
416{
417 constexpr default_delete() noexcept = default;
418 void operator()(T*) const noexcept;
419 template <class U> void operator()(U*) const = delete;
420};
421
422template <class T, class D = default_delete<T>>
423class unique_ptr
424{
425public:
426 typedef see below pointer;
427 typedef T element_type;
428 typedef D deleter_type;
429
430 // constructors
431 constexpr unique_ptr() noexcept;
432 explicit unique_ptr(pointer p) noexcept;
433 unique_ptr(pointer p, see below d1) noexcept;
434 unique_ptr(pointer p, see below d2) noexcept;
435 unique_ptr(unique_ptr&& u) noexcept;
436 unique_ptr(nullptr_t) noexcept : unique_ptr() { }
437 template <class U, class E>
438 unique_ptr(unique_ptr<U, E>&& u) noexcept;
439 template <class U>
440 unique_ptr(auto_ptr<U>&& u) noexcept; // removed in C++17
441
442 // destructor
443 ~unique_ptr();
444
445 // assignment
446 unique_ptr& operator=(unique_ptr&& u) noexcept;
447 template <class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept;
448 unique_ptr& operator=(nullptr_t) noexcept;
449
450 // observers
451 typename add_lvalue_reference<T>::type operator*() const;
452 pointer operator->() const noexcept;
453 pointer get() const noexcept;
454 deleter_type& get_deleter() noexcept;
455 const deleter_type& get_deleter() const noexcept;
456 explicit operator bool() const noexcept;
457
458 // modifiers
459 pointer release() noexcept;
460 void reset(pointer p = pointer()) noexcept;
461 void swap(unique_ptr& u) noexcept;
462};
463
464template <class T, class D>
465class unique_ptr<T[], D>
466{
467public:
468 typedef implementation-defined pointer;
469 typedef T element_type;
470 typedef D deleter_type;
471
472 // constructors
473 constexpr unique_ptr() noexcept;
474 explicit unique_ptr(pointer p) noexcept;
475 unique_ptr(pointer p, see below d) noexcept;
476 unique_ptr(pointer p, see below d) noexcept;
477 unique_ptr(unique_ptr&& u) noexcept;
478 unique_ptr(nullptr_t) noexcept : unique_ptr() { }
479
480 // destructor
481 ~unique_ptr();
482
483 // assignment
484 unique_ptr& operator=(unique_ptr&& u) noexcept;
485 unique_ptr& operator=(nullptr_t) noexcept;
486
487 // observers
488 T& operator[](size_t i) const;
489 pointer get() const noexcept;
490 deleter_type& get_deleter() noexcept;
491 const deleter_type& get_deleter() const noexcept;
492 explicit operator bool() const noexcept;
493
494 // modifiers
495 pointer release() noexcept;
496 void reset(pointer p = pointer()) noexcept;
497 void reset(nullptr_t) noexcept;
498 template <class U> void reset(U) = delete;
499 void swap(unique_ptr& u) noexcept;
500};
501
502template <class T, class D>
503 void swap(unique_ptr<T, D>& x, unique_ptr<T, D>& y) noexcept;
504
505template <class T1, class D1, class T2, class D2>
506 bool operator==(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
507template <class T1, class D1, class T2, class D2>
508 bool operator!=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
509template <class T1, class D1, class T2, class D2>
510 bool operator<(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
511template <class T1, class D1, class T2, class D2>
512 bool operator<=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
513template <class T1, class D1, class T2, class D2>
514 bool operator>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
515template <class T1, class D1, class T2, class D2>
516 bool operator>=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y);
517
518template <class T, class D>
519 bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept;
520template <class T, class D>
521 bool operator==(nullptr_t, const unique_ptr<T, D>& y) noexcept;
522template <class T, class D>
523 bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept;
524template <class T, class D>
525 bool operator!=(nullptr_t, const unique_ptr<T, D>& y) noexcept;
526
527template <class T, class D>
528 bool operator<(const unique_ptr<T, D>& x, nullptr_t);
529template <class T, class D>
530 bool operator<(nullptr_t, const unique_ptr<T, D>& y);
531template <class T, class D>
532 bool operator<=(const unique_ptr<T, D>& x, nullptr_t);
533template <class T, class D>
534 bool operator<=(nullptr_t, const unique_ptr<T, D>& y);
535template <class T, class D>
536 bool operator>(const unique_ptr<T, D>& x, nullptr_t);
537template <class T, class D>
538 bool operator>(nullptr_t, const unique_ptr<T, D>& y);
539template <class T, class D>
540 bool operator>=(const unique_ptr<T, D>& x, nullptr_t);
541template <class T, class D>
542 bool operator>=(nullptr_t, const unique_ptr<T, D>& y);
543
544class bad_weak_ptr
545 : public std::exception
546{
547 bad_weak_ptr() noexcept;
548};
549
550template<class T, class... Args> unique_ptr<T> make_unique(Args&&... args); // C++14
551template<class T> unique_ptr<T> make_unique(size_t n); // C++14
552template<class T, class... Args> unspecified make_unique(Args&&...) = delete; // C++14, T == U[N]
553
554template<class E, class T, class Y, class D>
555 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, unique_ptr<Y, D> const& p);
556
557template<class T>
558class shared_ptr
559{
560public:
561 typedef T element_type; // until C++17
562 typedef remove_extent_t<T> element_type; // since C++17
563 typedef weak_ptr<T> weak_type; // C++17
564
565 // constructors:
566 constexpr shared_ptr() noexcept;
567 template<class Y> explicit shared_ptr(Y* p);
568 template<class Y, class D> shared_ptr(Y* p, D d);
569 template<class Y, class D, class A> shared_ptr(Y* p, D d, A a);
570 template <class D> shared_ptr(nullptr_t p, D d);
571 template <class D, class A> shared_ptr(nullptr_t p, D d, A a);
572 template<class Y> shared_ptr(const shared_ptr<Y>& r, T *p) noexcept;
573 shared_ptr(const shared_ptr& r) noexcept;
574 template<class Y> shared_ptr(const shared_ptr<Y>& r) noexcept;
575 shared_ptr(shared_ptr&& r) noexcept;
576 template<class Y> shared_ptr(shared_ptr<Y>&& r) noexcept;
577 template<class Y> explicit shared_ptr(const weak_ptr<Y>& r);
578 template<class Y> shared_ptr(auto_ptr<Y>&& r); // removed in C++17
579 template <class Y, class D> shared_ptr(unique_ptr<Y, D>&& r);
580 shared_ptr(nullptr_t) : shared_ptr() { }
581
582 // destructor:
583 ~shared_ptr();
584
585 // assignment:
586 shared_ptr& operator=(const shared_ptr& r) noexcept;
587 template<class Y> shared_ptr& operator=(const shared_ptr<Y>& r) noexcept;
588 shared_ptr& operator=(shared_ptr&& r) noexcept;
589 template<class Y> shared_ptr& operator=(shared_ptr<Y>&& r);
590 template<class Y> shared_ptr& operator=(auto_ptr<Y>&& r); // removed in C++17
591 template <class Y, class D> shared_ptr& operator=(unique_ptr<Y, D>&& r);
592
593 // modifiers:
594 void swap(shared_ptr& r) noexcept;
595 void reset() noexcept;
596 template<class Y> void reset(Y* p);
597 template<class Y, class D> void reset(Y* p, D d);
598 template<class Y, class D, class A> void reset(Y* p, D d, A a);
599
600 // observers:
601 T* get() const noexcept;
602 T& operator*() const noexcept;
603 T* operator->() const noexcept;
604 long use_count() const noexcept;
605 bool unique() const noexcept;
606 explicit operator bool() const noexcept;
607 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept;
608 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept;
609};
610
611template<class T>
612shared_ptr(weak_ptr<T>) -> shared_ptr<T>;
613template<class T, class D>
614shared_ptr(unique_ptr<T, D>) -> shared_ptr<T>;
615
616// shared_ptr comparisons:
617template<class T, class U>
618 bool operator==(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
619template<class T, class U>
620 bool operator!=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
621template<class T, class U>
622 bool operator<(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
623template<class T, class U>
624 bool operator>(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
625template<class T, class U>
626 bool operator<=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
627template<class T, class U>
628 bool operator>=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept;
629
630template <class T>
631 bool operator==(const shared_ptr<T>& x, nullptr_t) noexcept;
632template <class T>
633 bool operator==(nullptr_t, const shared_ptr<T>& y) noexcept;
634template <class T>
635 bool operator!=(const shared_ptr<T>& x, nullptr_t) noexcept;
636template <class T>
637 bool operator!=(nullptr_t, const shared_ptr<T>& y) noexcept;
638template <class T>
639 bool operator<(const shared_ptr<T>& x, nullptr_t) noexcept;
640template <class T>
641bool operator<(nullptr_t, const shared_ptr<T>& y) noexcept;
642template <class T>
643 bool operator<=(const shared_ptr<T>& x, nullptr_t) noexcept;
644template <class T>
645 bool operator<=(nullptr_t, const shared_ptr<T>& y) noexcept;
646template <class T>
647 bool operator>(const shared_ptr<T>& x, nullptr_t) noexcept;
648template <class T>
649 bool operator>(nullptr_t, const shared_ptr<T>& y) noexcept;
650template <class T>
651 bool operator>=(const shared_ptr<T>& x, nullptr_t) noexcept;
652template <class T>
653 bool operator>=(nullptr_t, const shared_ptr<T>& y) noexcept;
654
655// shared_ptr specialized algorithms:
656template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b) noexcept;
657
658// shared_ptr casts:
659template<class T, class U>
660 shared_ptr<T> static_pointer_cast(shared_ptr<U> const& r) noexcept;
661template<class T, class U>
662 shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const& r) noexcept;
663template<class T, class U>
664 shared_ptr<T> const_pointer_cast(shared_ptr<U> const& r) noexcept;
665
666// shared_ptr I/O:
667template<class E, class T, class Y>
668 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, shared_ptr<Y> const& p);
669
670// shared_ptr get_deleter:
671template<class D, class T> D* get_deleter(shared_ptr<T> const& p) noexcept;
672
673template<class T, class... Args>
674 shared_ptr<T> make_shared(Args&&... args); // T is not an array
675template<class T, class A, class... Args>
676 shared_ptr<T> allocate_shared(const A& a, Args&&... args); // T is not an array
677
678template<class T>
679 shared_ptr<T> make_shared(size_t N); // T is U[] (since C++20)
680template<class T, class A>
681 shared_ptr<T> allocate_shared(const A& a, size_t N); // T is U[] (since C++20)
682
683template<class T>
684 shared_ptr<T> make_shared(); // T is U[N] (since C++20)
685template<class T, class A>
686 shared_ptr<T> allocate_shared(const A& a); // T is U[N] (since C++20)
687
688template<class T>
689 shared_ptr<T> make_shared(size_t N, const remove_extent_t<T>& u); // T is U[] (since C++20)
690template<class T, class A>
691 shared_ptr<T> allocate_shared(const A& a, size_t N, const remove_extent_t<T>& u); // T is U[] (since C++20)
692
693template<class T> shared_ptr<T>
694 make_shared(const remove_extent_t<T>& u); // T is U[N] (since C++20)
695template<class T, class A>
696 shared_ptr<T> allocate_shared(const A& a, const remove_extent_t<T>& u); // T is U[N] (since C++20)
697
698template<class T>
699class weak_ptr
700{
701public:
702 typedef T element_type; // until C++17
703 typedef remove_extent_t<T> element_type; // since C++17
704
705 // constructors
706 constexpr weak_ptr() noexcept;
707 template<class Y> weak_ptr(shared_ptr<Y> const& r) noexcept;
708 weak_ptr(weak_ptr const& r) noexcept;
709 template<class Y> weak_ptr(weak_ptr<Y> const& r) noexcept;
710 weak_ptr(weak_ptr&& r) noexcept; // C++14
711 template<class Y> weak_ptr(weak_ptr<Y>&& r) noexcept; // C++14
712
713 // destructor
714 ~weak_ptr();
715
716 // assignment
717 weak_ptr& operator=(weak_ptr const& r) noexcept;
718 template<class Y> weak_ptr& operator=(weak_ptr<Y> const& r) noexcept;
719 template<class Y> weak_ptr& operator=(shared_ptr<Y> const& r) noexcept;
720 weak_ptr& operator=(weak_ptr&& r) noexcept; // C++14
721 template<class Y> weak_ptr& operator=(weak_ptr<Y>&& r) noexcept; // C++14
722
723 // modifiers
724 void swap(weak_ptr& r) noexcept;
725 void reset() noexcept;
726
727 // observers
728 long use_count() const noexcept;
729 bool expired() const noexcept;
730 shared_ptr<T> lock() const noexcept;
731 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept;
732 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept;
733};
734
735template<class T>
736weak_ptr(shared_ptr<T>) -> weak_ptr<T>;
737
738// weak_ptr specialized algorithms:
739template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) noexcept;
740
741// class owner_less:
742template<class T> struct owner_less;
743
744template<class T>
745struct owner_less<shared_ptr<T> >
746 : binary_function<shared_ptr<T>, shared_ptr<T>, bool>
747{
748 typedef bool result_type;
749 bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const noexcept;
750 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept;
751 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept;
752};
753
754template<class T>
755struct owner_less<weak_ptr<T> >
756 : binary_function<weak_ptr<T>, weak_ptr<T>, bool>
757{
758 typedef bool result_type;
759 bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const noexcept;
760 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept;
761 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept;
762};
763
764template <> // Added in C++14
765struct owner_less<void>
766{
767 template <class _Tp, class _Up>
768 bool operator()( shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept;
769 template <class _Tp, class _Up>
770 bool operator()( shared_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept;
771 template <class _Tp, class _Up>
772 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept;
773 template <class _Tp, class _Up>
774 bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept;
775
776 typedef void is_transparent;
777};
778
779template<class T>
780class enable_shared_from_this
781{
782protected:
783 constexpr enable_shared_from_this() noexcept;
784 enable_shared_from_this(enable_shared_from_this const&) noexcept;
785 enable_shared_from_this& operator=(enable_shared_from_this const&) noexcept;
786 ~enable_shared_from_this();
787public:
788 shared_ptr<T> shared_from_this();
789 shared_ptr<T const> shared_from_this() const;
790};
791
792template<class T>
793 bool atomic_is_lock_free(const shared_ptr<T>* p);
794template<class T>
795 shared_ptr<T> atomic_load(const shared_ptr<T>* p);
796template<class T>
797 shared_ptr<T> atomic_load_explicit(const shared_ptr<T>* p, memory_order mo);
798template<class T>
799 void atomic_store(shared_ptr<T>* p, shared_ptr<T> r);
800template<class T>
801 void atomic_store_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo);
802template<class T>
803 shared_ptr<T> atomic_exchange(shared_ptr<T>* p, shared_ptr<T> r);
804template<class T>
805 shared_ptr<T>
806 atomic_exchange_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo);
807template<class T>
808 bool
809 atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w);
810template<class T>
811 bool
812 atomic_compare_exchange_strong( shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w);
813template<class T>
814 bool
815 atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
816 shared_ptr<T> w, memory_order success,
817 memory_order failure);
818template<class T>
819 bool
820 atomic_compare_exchange_strong_explicit(shared_ptr<T>* p, shared_ptr<T>* v,
821 shared_ptr<T> w, memory_order success,
822 memory_order failure);
823// Hash support
824template <class T> struct hash;
825template <class T, class D> struct hash<unique_ptr<T, D> >;
826template <class T> struct hash<shared_ptr<T> >;
827
828template <class T, class Alloc>
829 inline constexpr bool uses_allocator_v = uses_allocator<T, Alloc>::value;
830
831// [ptr.align]
832void* align(size_t alignment, size_t size, void*& ptr, size_t& space);
833
834template<size_t N, class T>
835[[nodiscard]] constexpr T* assume_aligned(T* ptr); // since C++20
836
837} // std
838
839*/
840
841#include <__assert> // all public C++ headers provide the assertion handler
842#include <__config>
843#include <__memory/addressof.h>
844#include <__memory/allocate_at_least.h>
845#include <__memory/allocation_guard.h>
846#include <__memory/allocator.h>
847#include <__memory/allocator_arg_t.h>
848#include <__memory/allocator_traits.h>
849#include <__memory/assume_aligned.h>
850#include <__memory/auto_ptr.h>
851#include <__memory/compressed_pair.h>
852#include <__memory/concepts.h>
853#include <__memory/construct_at.h>
854#include <__memory/pointer_traits.h>
855#include <__memory/ranges_construct_at.h>
856#include <__memory/ranges_uninitialized_algorithms.h>
857#include <__memory/raw_storage_iterator.h>
858#include <__memory/shared_ptr.h>
859#include <__memory/temporary_buffer.h>
860#include <__memory/uninitialized_algorithms.h>
861#include <__memory/unique_ptr.h>
862#include <__memory/uses_allocator.h>
863#include <cstddef>
864#include <cstdint>
865#include <cstring>
866#include <iosfwd>
867#include <new>
868#include <stdexcept>
869#include <tuple>
870#include <type_traits>
871#include <typeinfo>
872#include <version>
873
874#ifndef _LIBCPP_REMOVE_TRANSITIVE_INCLUDES
875# include <iterator>
876# include <utility>
877#endif
878
879// standard-mandated includes
880#include <compare>
881
882#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
883# pragma GCC system_header
884#endif
885
886_LIBCPP_BEGIN_NAMESPACE_STD
887
888template <class _Alloc, class _Ptr>
889_LIBCPP_INLINE_VISIBILITY
890void __construct_forward_with_exception_guarantees(_Alloc& __a, _Ptr __begin1, _Ptr __end1, _Ptr& __begin2) {
891 static_assert(__is_cpp17_move_insertable<_Alloc>::value,
892 "The specified type does not meet the requirements of Cpp17MoveInsertable");
893 typedef allocator_traits<_Alloc> _Traits;
894 for (; __begin1 != __end1; ++__begin1, (void)++__begin2) {
895 _Traits::construct(__a, _VSTD::__to_address(__begin2),
896#ifdef _LIBCPP_NO_EXCEPTIONS
897 _VSTD::move(*__begin1)
898#else
899 _VSTD::move_if_noexcept(*__begin1)
900#endif
901 );
902 }
903}
904
905template <class _Alloc, class _Tp, typename enable_if<
906 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Tp*, _Tp>::value) &&
907 is_trivially_move_constructible<_Tp>::value
908>::type>
909_LIBCPP_INLINE_VISIBILITY
910void __construct_forward_with_exception_guarantees(_Alloc&, _Tp* __begin1, _Tp* __end1, _Tp*& __begin2) {
911 ptrdiff_t _Np = __end1 - __begin1;
912 if (_Np > 0) {
913 _VSTD::memcpy(__begin2, __begin1, _Np * sizeof(_Tp));
914 __begin2 += _Np;
915 }
916}
917
918template <class _Alloc, class _Iter, class _Ptr>
919_LIBCPP_INLINE_VISIBILITY
920void __construct_range_forward(_Alloc& __a, _Iter __begin1, _Iter __end1, _Ptr& __begin2) {
921 typedef allocator_traits<_Alloc> _Traits;
922 for (; __begin1 != __end1; ++__begin1, (void) ++__begin2) {
923 _Traits::construct(__a, _VSTD::__to_address(__begin2), *__begin1);
924 }
925}
926
927template <class _Alloc, class _Source, class _Dest,
928 class _RawSource = typename remove_const<_Source>::type,
929 class _RawDest = typename remove_const<_Dest>::type,
930 class =
931 typename enable_if<
932 is_trivially_copy_constructible<_Dest>::value &&
933 is_same<_RawSource, _RawDest>::value &&
934 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Dest*, _Source&>::value)
935 >::type>
936_LIBCPP_INLINE_VISIBILITY
937void __construct_range_forward(_Alloc&, _Source* __begin1, _Source* __end1, _Dest*& __begin2) {
938 ptrdiff_t _Np = __end1 - __begin1;
939 if (_Np > 0) {
940 _VSTD::memcpy(const_cast<_RawDest*>(__begin2), __begin1, _Np * sizeof(_Dest));
941 __begin2 += _Np;
942 }
943}
944
945template <class _Alloc, class _Ptr>
946_LIBCPP_INLINE_VISIBILITY
947void __construct_backward_with_exception_guarantees(_Alloc& __a, _Ptr __begin1, _Ptr __end1, _Ptr& __end2) {
948 static_assert(__is_cpp17_move_insertable<_Alloc>::value,
949 "The specified type does not meet the requirements of Cpp17MoveInsertable");
950 typedef allocator_traits<_Alloc> _Traits;
951 while (__end1 != __begin1) {
952 _Traits::construct(__a, _VSTD::__to_address(__end2 - 1),
953#ifdef _LIBCPP_NO_EXCEPTIONS
954 _VSTD::move(*--__end1)
955#else
956 _VSTD::move_if_noexcept(*--__end1)
957#endif
958 );
959 --__end2;
960 }
961}
962
963template <class _Alloc, class _Tp, class = typename enable_if<
964 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Tp*, _Tp>::value) &&
965 is_trivially_move_constructible<_Tp>::value
966>::type>
967_LIBCPP_INLINE_VISIBILITY
968void __construct_backward_with_exception_guarantees(_Alloc&, _Tp* __begin1, _Tp* __end1, _Tp*& __end2) {
969 ptrdiff_t _Np = __end1 - __begin1;
970 __end2 -= _Np;
971 if (_Np > 0)
972 _VSTD::memcpy(static_cast<void*>(__end2), static_cast<void const*>(__begin1), _Np * sizeof(_Tp));
973}
974
975struct __destruct_n
976{
977private:
978 size_t __size_;
979
980 template <class _Tp>
981 _LIBCPP_INLINE_VISIBILITY void __process(_Tp* __p, false_type) _NOEXCEPT
982 {for (size_t __i = 0; __i < __size_; ++__i, ++__p) __p->~_Tp();}
983
984 template <class _Tp>
985 _LIBCPP_INLINE_VISIBILITY void __process(_Tp*, true_type) _NOEXCEPT
986 {}
987
988 _LIBCPP_INLINE_VISIBILITY void __incr(false_type) _NOEXCEPT
989 {++__size_;}
990 _LIBCPP_INLINE_VISIBILITY void __incr(true_type) _NOEXCEPT
991 {}
992
993 _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, false_type) _NOEXCEPT
994 {__size_ = __s;}
995 _LIBCPP_INLINE_VISIBILITY void __set(size_t, true_type) _NOEXCEPT
996 {}
997public:
998 _LIBCPP_INLINE_VISIBILITY explicit __destruct_n(size_t __s) _NOEXCEPT
999 : __size_(__s) {}
1000
1001 template <class _Tp>
1002 _LIBCPP_INLINE_VISIBILITY void __incr() _NOEXCEPT
1003 {__incr(integral_constant<bool, is_trivially_destructible<_Tp>::value>());}
1004
1005 template <class _Tp>
1006 _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, _Tp*) _NOEXCEPT
1007 {__set(__s, integral_constant<bool, is_trivially_destructible<_Tp>::value>());}
1008
1009 template <class _Tp>
1010 _LIBCPP_INLINE_VISIBILITY void operator()(_Tp* __p) _NOEXCEPT
1011 {__process(__p, integral_constant<bool, is_trivially_destructible<_Tp>::value>());}
1012};
1013
1014_LIBCPP_FUNC_VIS void* align(size_t __align, size_t __sz, void*& __ptr, size_t& __space);
1015
1016// --- Helper for container swap --
1017template <typename _Alloc>
1018_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
1019void __swap_allocator(_Alloc & __a1, _Alloc & __a2, true_type)
1020#if _LIBCPP_STD_VER > 11
1021 _NOEXCEPT
1022#else
1023 _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value)
1024#endif
1025{
1026 using _VSTD::swap;
1027 swap(__a1, __a2);
1028}
1029
1030template <typename _Alloc>
1031inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
1032void __swap_allocator(_Alloc &, _Alloc &, false_type) _NOEXCEPT {}
1033
1034template <typename _Alloc>
1035inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_AFTER_CXX11
1036void __swap_allocator(_Alloc & __a1, _Alloc & __a2)
1037#if _LIBCPP_STD_VER > 11
1038 _NOEXCEPT
1039#else
1040 _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value)
1041#endif
1042{
1043 _VSTD::__swap_allocator(__a1, __a2,
1044 integral_constant<bool, allocator_traits<_Alloc>::propagate_on_container_swap::value>());
1045}
1046
1047template <typename _Alloc, typename _Traits=allocator_traits<_Alloc> >
1048struct __noexcept_move_assign_container : public integral_constant<bool,
1049 _Traits::propagate_on_container_move_assignment::value
1050#if _LIBCPP_STD_VER > 14
1051 || _Traits::is_always_equal::value
1052#else
1053 && is_nothrow_move_assignable<_Alloc>::value
1054#endif
1055 > {};
1056
1057
1058template <class _Tp, class _Alloc>
1059struct __temp_value {
1060 typedef allocator_traits<_Alloc> _Traits;
1061
1062 typename aligned_storage<sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)>::type __v;
1063 _Alloc &__a;
1064
1065 _Tp *__addr() { return reinterpret_cast<_Tp *>(addressof(__v)); }
1066 _Tp & get() { return *__addr(); }
1067
1068 template<class... _Args>
1069 _LIBCPP_NO_CFI
1070 __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc) {
1071 _Traits::construct(__a, reinterpret_cast<_Tp*>(addressof(__v)),
1072 _VSTD::forward<_Args>(__args)...);
1073 }
1074
1075 ~__temp_value() { _Traits::destroy(__a, __addr()); }
1076 };
1077
1078template<typename _Alloc, typename = void, typename = void>
1079struct __is_allocator : false_type {};
1080
1081template<typename _Alloc>
1082struct __is_allocator<_Alloc,
1083 typename __void_t<typename _Alloc::value_type>::type,
1084 typename __void_t<decltype(declval<_Alloc&>().allocate(size_t(0)))>::type
1085 >
1086 : true_type {};
1087
1088// __builtin_new_allocator -- A non-templated helper for allocating and
1089// deallocating memory using __builtin_operator_new and
1090// __builtin_operator_delete. It should be used in preference to
1091// `std::allocator<T>` to avoid additional instantiations.
1092struct __builtin_new_allocator {
1093 struct __builtin_new_deleter {
1094 typedef void* pointer_type;
1095
1096 _LIBCPP_CONSTEXPR explicit __builtin_new_deleter(size_t __size, size_t __align)
1097 : __size_(__size), __align_(__align) {}
1098
1099 void operator()(void* __p) const _NOEXCEPT {
1100 _VSTD::__libcpp_deallocate(ptr: __p, size: __size_, align: __align_);
1101 }
1102
1103 private:
1104 size_t __size_;
1105 size_t __align_;
1106 };
1107
1108 typedef unique_ptr<void, __builtin_new_deleter> __holder_t;
1109
1110 static __holder_t __allocate_bytes(size_t __s, size_t __align) {
1111 return __holder_t(_VSTD::__libcpp_allocate(size: __s, __align),
1112 __builtin_new_deleter(__s, __align));
1113 }
1114
1115 static void __deallocate_bytes(void* __p, size_t __s,
1116 size_t __align) _NOEXCEPT {
1117 _VSTD::__libcpp_deallocate(ptr: __p, size: __s, __align);
1118 }
1119
1120 template <class _Tp>
1121 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE
1122 static __holder_t __allocate_type(size_t __n) {
1123 return __allocate_bytes(s: __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
1124 }
1125
1126 template <class _Tp>
1127 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE
1128 static void __deallocate_type(void* __p, size_t __n) _NOEXCEPT {
1129 __deallocate_bytes(__p, s: __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp));
1130 }
1131};
1132
1133_LIBCPP_END_NAMESPACE_STD
1134
1135#if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17
1136# include <__pstl_memory>
1137#endif
1138
1139#endif // _LIBCPP_MEMORY
1140

source code of flutter_engine/third_party/libcxx/include/memory