1// -*- C++ -*- 2//===-------------------------- memory ------------------------------------===// 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 <> 102class allocator<void> // removed in C++20 103{ 104public: 105 typedef void* pointer; 106 typedef const void* const_pointer; 107 typedef void value_type; 108 109 template <class _Up> struct rebind {typedef allocator<_Up> other;}; 110}; 111 112template <class T> 113class allocator 114{ 115public: 116 typedef size_t size_type; 117 typedef ptrdiff_t difference_type; 118 typedef T* pointer; // deprecated in C++17, removed in C++20 119 typedef const T* const_pointer; // deprecated in C++17, removed in C++20 120 typedef typename add_lvalue_reference<T>::type 121 reference; // deprecated in C++17, removed in C++20 122 typedef typename add_lvalue_reference<const T>::type 123 const_reference; // deprecated in C++17, removed in C++20 124 125 typedef T value_type; 126 127 template <class U> struct rebind {typedef allocator<U> other;}; // deprecated in C++17, removed in C++20 128 129 typedef true_type propagate_on_container_move_assignment; 130 typedef true_type is_always_equal; 131 132 constexpr allocator() noexcept; // constexpr in C++20 133 constexpr allocator(const allocator&) noexcept; // constexpr in C++20 134 template <class U> 135 constexpr allocator(const allocator<U>&) noexcept; // constexpr in C++20 136 ~allocator(); // constexpr in C++20 137 pointer address(reference x) const noexcept; // deprecated in C++17, removed in C++20 138 const_pointer address(const_reference x) const noexcept; // deprecated in C++17, removed in C++20 139 T* allocate(size_t n, const void* hint); // deprecated in C++17, removed in C++20 140 T* allocate(size_t n); // constexpr in C++20 141 void deallocate(T* p, size_t n) noexcept; // constexpr in C++20 142 size_type max_size() const noexcept; // deprecated in C++17, removed in C++20 143 template<class U, class... Args> 144 void construct(U* p, Args&&... args); // deprecated in C++17, removed in C++20 145 template <class U> 146 void destroy(U* p); // deprecated in C++17, removed in C++20 147}; 148 149template <class T, class U> 150bool operator==(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20 151 152template <class T, class U> 153bool operator!=(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20 154 155template <class OutputIterator, class T> 156class raw_storage_iterator // deprecated in C++17, removed in C++20 157 : public iterator<output_iterator_tag, void, void, void, void> // until C++17 158{ 159public: 160 typedef output_iterator_tag iterator_category; 161 typedef void value_type; 162 typedef void difference_type; // until C++20 163 typedef ptrdiff_t difference_type; // since C++20 164 typedef void pointer; 165 typedef void reference; 166 167 explicit raw_storage_iterator(OutputIterator x); 168 raw_storage_iterator& operator*(); 169 raw_storage_iterator& operator=(const T& element); 170 raw_storage_iterator& operator++(); 171 raw_storage_iterator operator++(int); 172}; 173 174template <class T> pair<T*,ptrdiff_t> get_temporary_buffer(ptrdiff_t n) noexcept; 175template <class T> void return_temporary_buffer(T* p) noexcept; 176 177template <class T> T* addressof(T& r) noexcept; 178template <class T> T* addressof(const T&& r) noexcept = delete; 179 180template <class InputIterator, class ForwardIterator> 181ForwardIterator 182uninitialized_copy(InputIterator first, InputIterator last, ForwardIterator result); 183 184template <class InputIterator, class Size, class ForwardIterator> 185ForwardIterator 186uninitialized_copy_n(InputIterator first, Size n, ForwardIterator result); 187 188template <class ForwardIterator, class T> 189void uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x); 190 191template <class ForwardIterator, class Size, class T> 192ForwardIterator 193uninitialized_fill_n(ForwardIterator first, Size n, const T& x); 194 195template <class T, class ...Args> 196constexpr T* construct_at(T* location, Args&& ...args); // since C++20 197 198template <class T> 199void destroy_at(T* location); // constexpr in C++20 200 201template <class ForwardIterator> 202void destroy(ForwardIterator first, ForwardIterator last); // constexpr in C++20 203 204template <class ForwardIterator, class Size> 205ForwardIterator destroy_n(ForwardIterator first, Size n); // constexpr in C++20 206 207template <class InputIterator, class ForwardIterator> 208 ForwardIterator uninitialized_move(InputIterator first, InputIterator last, ForwardIterator result); 209 210template <class InputIterator, class Size, class ForwardIterator> 211 pair<InputIterator,ForwardIterator> uninitialized_move_n(InputIterator first, Size n, ForwardIterator result); 212 213template <class ForwardIterator> 214 void uninitialized_value_construct(ForwardIterator first, ForwardIterator last); 215 216template <class ForwardIterator, class Size> 217 ForwardIterator uninitialized_value_construct_n(ForwardIterator first, Size n); 218 219template <class ForwardIterator> 220 void uninitialized_default_construct(ForwardIterator first, ForwardIterator last); 221 222template <class ForwardIterator, class Size> 223 ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n); 224 225template <class Y> struct auto_ptr_ref {}; // deprecated in C++11, removed in C++17 226 227template<class X> 228class auto_ptr // deprecated in C++11, removed in C++17 229{ 230public: 231 typedef X element_type; 232 233 explicit auto_ptr(X* p =0) throw(); 234 auto_ptr(auto_ptr&) throw(); 235 template<class Y> auto_ptr(auto_ptr<Y>&) throw(); 236 auto_ptr& operator=(auto_ptr&) throw(); 237 template<class Y> auto_ptr& operator=(auto_ptr<Y>&) throw(); 238 auto_ptr& operator=(auto_ptr_ref<X> r) throw(); 239 ~auto_ptr() throw(); 240 241 typename add_lvalue_reference<X>::type operator*() const throw(); 242 X* operator->() const throw(); 243 X* get() const throw(); 244 X* release() throw(); 245 void reset(X* p =0) throw(); 246 247 auto_ptr(auto_ptr_ref<X>) throw(); 248 template<class Y> operator auto_ptr_ref<Y>() throw(); 249 template<class Y> operator auto_ptr<Y>() throw(); 250}; 251 252template <class T> 253struct default_delete 254{ 255 constexpr default_delete() noexcept = default; 256 template <class U> default_delete(const default_delete<U>&) noexcept; 257 258 void operator()(T*) const noexcept; 259}; 260 261template <class T> 262struct default_delete<T[]> 263{ 264 constexpr default_delete() noexcept = default; 265 void operator()(T*) const noexcept; 266 template <class U> void operator()(U*) const = delete; 267}; 268 269template <class T, class D = default_delete<T>> 270class unique_ptr 271{ 272public: 273 typedef see below pointer; 274 typedef T element_type; 275 typedef D deleter_type; 276 277 // constructors 278 constexpr unique_ptr() noexcept; 279 explicit unique_ptr(pointer p) noexcept; 280 unique_ptr(pointer p, see below d1) noexcept; 281 unique_ptr(pointer p, see below d2) noexcept; 282 unique_ptr(unique_ptr&& u) noexcept; 283 unique_ptr(nullptr_t) noexcept : unique_ptr() { } 284 template <class U, class E> 285 unique_ptr(unique_ptr<U, E>&& u) noexcept; 286 template <class U> 287 unique_ptr(auto_ptr<U>&& u) noexcept; // removed in C++17 288 289 // destructor 290 ~unique_ptr(); 291 292 // assignment 293 unique_ptr& operator=(unique_ptr&& u) noexcept; 294 template <class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept; 295 unique_ptr& operator=(nullptr_t) noexcept; 296 297 // observers 298 typename add_lvalue_reference<T>::type operator*() const; 299 pointer operator->() const noexcept; 300 pointer get() const noexcept; 301 deleter_type& get_deleter() noexcept; 302 const deleter_type& get_deleter() const noexcept; 303 explicit operator bool() const noexcept; 304 305 // modifiers 306 pointer release() noexcept; 307 void reset(pointer p = pointer()) noexcept; 308 void swap(unique_ptr& u) noexcept; 309}; 310 311template <class T, class D> 312class unique_ptr<T[], D> 313{ 314public: 315 typedef implementation-defined pointer; 316 typedef T element_type; 317 typedef D deleter_type; 318 319 // constructors 320 constexpr unique_ptr() noexcept; 321 explicit unique_ptr(pointer p) noexcept; 322 unique_ptr(pointer p, see below d) noexcept; 323 unique_ptr(pointer p, see below d) noexcept; 324 unique_ptr(unique_ptr&& u) noexcept; 325 unique_ptr(nullptr_t) noexcept : unique_ptr() { } 326 327 // destructor 328 ~unique_ptr(); 329 330 // assignment 331 unique_ptr& operator=(unique_ptr&& u) noexcept; 332 unique_ptr& operator=(nullptr_t) noexcept; 333 334 // observers 335 T& operator[](size_t i) const; 336 pointer get() const noexcept; 337 deleter_type& get_deleter() noexcept; 338 const deleter_type& get_deleter() const noexcept; 339 explicit operator bool() const noexcept; 340 341 // modifiers 342 pointer release() noexcept; 343 void reset(pointer p = pointer()) noexcept; 344 void reset(nullptr_t) noexcept; 345 template <class U> void reset(U) = delete; 346 void swap(unique_ptr& u) noexcept; 347}; 348 349template <class T, class D> 350 void swap(unique_ptr<T, D>& x, unique_ptr<T, D>& y) noexcept; 351 352template <class T1, class D1, class T2, class D2> 353 bool operator==(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 354template <class T1, class D1, class T2, class D2> 355 bool operator!=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 356template <class T1, class D1, class T2, class D2> 357 bool operator<(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 358template <class T1, class D1, class T2, class D2> 359 bool operator<=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 360template <class T1, class D1, class T2, class D2> 361 bool operator>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 362template <class T1, class D1, class T2, class D2> 363 bool operator>=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 364 365template <class T, class D> 366 bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept; 367template <class T, class D> 368 bool operator==(nullptr_t, const unique_ptr<T, D>& y) noexcept; 369template <class T, class D> 370 bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept; 371template <class T, class D> 372 bool operator!=(nullptr_t, const unique_ptr<T, D>& y) noexcept; 373 374template <class T, class D> 375 bool operator<(const unique_ptr<T, D>& x, nullptr_t); 376template <class T, class D> 377 bool operator<(nullptr_t, const unique_ptr<T, D>& y); 378template <class T, class D> 379 bool operator<=(const unique_ptr<T, D>& x, nullptr_t); 380template <class T, class D> 381 bool operator<=(nullptr_t, const unique_ptr<T, D>& y); 382template <class T, class D> 383 bool operator>(const unique_ptr<T, D>& x, nullptr_t); 384template <class T, class D> 385 bool operator>(nullptr_t, const unique_ptr<T, D>& y); 386template <class T, class D> 387 bool operator>=(const unique_ptr<T, D>& x, nullptr_t); 388template <class T, class D> 389 bool operator>=(nullptr_t, const unique_ptr<T, D>& y); 390 391class bad_weak_ptr 392 : public std::exception 393{ 394 bad_weak_ptr() noexcept; 395}; 396 397template<class T, class... Args> unique_ptr<T> make_unique(Args&&... args); // C++14 398template<class T> unique_ptr<T> make_unique(size_t n); // C++14 399template<class T, class... Args> unspecified make_unique(Args&&...) = delete; // C++14, T == U[N] 400 401template<class E, class T, class Y, class D> 402 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, unique_ptr<Y, D> const& p); 403 404template<class T> 405class shared_ptr 406{ 407public: 408 typedef T element_type; 409 typedef weak_ptr<T> weak_type; // C++17 410 411 // constructors: 412 constexpr shared_ptr() noexcept; 413 template<class Y> explicit shared_ptr(Y* p); 414 template<class Y, class D> shared_ptr(Y* p, D d); 415 template<class Y, class D, class A> shared_ptr(Y* p, D d, A a); 416 template <class D> shared_ptr(nullptr_t p, D d); 417 template <class D, class A> shared_ptr(nullptr_t p, D d, A a); 418 template<class Y> shared_ptr(const shared_ptr<Y>& r, T *p) noexcept; 419 shared_ptr(const shared_ptr& r) noexcept; 420 template<class Y> shared_ptr(const shared_ptr<Y>& r) noexcept; 421 shared_ptr(shared_ptr&& r) noexcept; 422 template<class Y> shared_ptr(shared_ptr<Y>&& r) noexcept; 423 template<class Y> explicit shared_ptr(const weak_ptr<Y>& r); 424 template<class Y> shared_ptr(auto_ptr<Y>&& r); // removed in C++17 425 template <class Y, class D> shared_ptr(unique_ptr<Y, D>&& r); 426 shared_ptr(nullptr_t) : shared_ptr() { } 427 428 // destructor: 429 ~shared_ptr(); 430 431 // assignment: 432 shared_ptr& operator=(const shared_ptr& r) noexcept; 433 template<class Y> shared_ptr& operator=(const shared_ptr<Y>& r) noexcept; 434 shared_ptr& operator=(shared_ptr&& r) noexcept; 435 template<class Y> shared_ptr& operator=(shared_ptr<Y>&& r); 436 template<class Y> shared_ptr& operator=(auto_ptr<Y>&& r); // removed in C++17 437 template <class Y, class D> shared_ptr& operator=(unique_ptr<Y, D>&& r); 438 439 // modifiers: 440 void swap(shared_ptr& r) noexcept; 441 void reset() noexcept; 442 template<class Y> void reset(Y* p); 443 template<class Y, class D> void reset(Y* p, D d); 444 template<class Y, class D, class A> void reset(Y* p, D d, A a); 445 446 // observers: 447 T* get() const noexcept; 448 T& operator*() const noexcept; 449 T* operator->() const noexcept; 450 long use_count() const noexcept; 451 bool unique() const noexcept; 452 explicit operator bool() const noexcept; 453 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept; 454 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept; 455}; 456 457template<class T> 458shared_ptr(weak_ptr<T>) -> shared_ptr<T>; 459template<class T, class D> 460shared_ptr(unique_ptr<T, D>) -> shared_ptr<T>; 461 462// shared_ptr comparisons: 463template<class T, class U> 464 bool operator==(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 465template<class T, class U> 466 bool operator!=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 467template<class T, class U> 468 bool operator<(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 469template<class T, class U> 470 bool operator>(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 471template<class T, class U> 472 bool operator<=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 473template<class T, class U> 474 bool operator>=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 475 476template <class T> 477 bool operator==(const shared_ptr<T>& x, nullptr_t) noexcept; 478template <class T> 479 bool operator==(nullptr_t, const shared_ptr<T>& y) noexcept; 480template <class T> 481 bool operator!=(const shared_ptr<T>& x, nullptr_t) noexcept; 482template <class T> 483 bool operator!=(nullptr_t, const shared_ptr<T>& y) noexcept; 484template <class T> 485 bool operator<(const shared_ptr<T>& x, nullptr_t) noexcept; 486template <class T> 487bool operator<(nullptr_t, const shared_ptr<T>& y) noexcept; 488template <class T> 489 bool operator<=(const shared_ptr<T>& x, nullptr_t) noexcept; 490template <class T> 491 bool operator<=(nullptr_t, const shared_ptr<T>& y) noexcept; 492template <class T> 493 bool operator>(const shared_ptr<T>& x, nullptr_t) noexcept; 494template <class T> 495 bool operator>(nullptr_t, const shared_ptr<T>& y) noexcept; 496template <class T> 497 bool operator>=(const shared_ptr<T>& x, nullptr_t) noexcept; 498template <class T> 499 bool operator>=(nullptr_t, const shared_ptr<T>& y) noexcept; 500 501// shared_ptr specialized algorithms: 502template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b) noexcept; 503 504// shared_ptr casts: 505template<class T, class U> 506 shared_ptr<T> static_pointer_cast(shared_ptr<U> const& r) noexcept; 507template<class T, class U> 508 shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const& r) noexcept; 509template<class T, class U> 510 shared_ptr<T> const_pointer_cast(shared_ptr<U> const& r) noexcept; 511 512// shared_ptr I/O: 513template<class E, class T, class Y> 514 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, shared_ptr<Y> const& p); 515 516// shared_ptr get_deleter: 517template<class D, class T> D* get_deleter(shared_ptr<T> const& p) noexcept; 518 519template<class T, class... Args> 520 shared_ptr<T> make_shared(Args&&... args); 521template<class T, class A, class... Args> 522 shared_ptr<T> allocate_shared(const A& a, Args&&... args); 523 524template<class T> 525class weak_ptr 526{ 527public: 528 typedef T element_type; 529 530 // constructors 531 constexpr weak_ptr() noexcept; 532 template<class Y> weak_ptr(shared_ptr<Y> const& r) noexcept; 533 weak_ptr(weak_ptr const& r) noexcept; 534 template<class Y> weak_ptr(weak_ptr<Y> const& r) noexcept; 535 weak_ptr(weak_ptr&& r) noexcept; // C++14 536 template<class Y> weak_ptr(weak_ptr<Y>&& r) noexcept; // C++14 537 538 // destructor 539 ~weak_ptr(); 540 541 // assignment 542 weak_ptr& operator=(weak_ptr const& r) noexcept; 543 template<class Y> weak_ptr& operator=(weak_ptr<Y> const& r) noexcept; 544 template<class Y> weak_ptr& operator=(shared_ptr<Y> const& r) noexcept; 545 weak_ptr& operator=(weak_ptr&& r) noexcept; // C++14 546 template<class Y> weak_ptr& operator=(weak_ptr<Y>&& r) noexcept; // C++14 547 548 // modifiers 549 void swap(weak_ptr& r) noexcept; 550 void reset() noexcept; 551 552 // observers 553 long use_count() const noexcept; 554 bool expired() const noexcept; 555 shared_ptr<T> lock() const noexcept; 556 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept; 557 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept; 558}; 559 560template<class T> 561weak_ptr(shared_ptr<T>) -> weak_ptr<T>; 562 563// weak_ptr specialized algorithms: 564template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) noexcept; 565 566// class owner_less: 567template<class T> struct owner_less; 568 569template<class T> 570struct owner_less<shared_ptr<T> > 571 : binary_function<shared_ptr<T>, shared_ptr<T>, bool> 572{ 573 typedef bool result_type; 574 bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const noexcept; 575 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept; 576 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept; 577}; 578 579template<class T> 580struct owner_less<weak_ptr<T> > 581 : binary_function<weak_ptr<T>, weak_ptr<T>, bool> 582{ 583 typedef bool result_type; 584 bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const noexcept; 585 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept; 586 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept; 587}; 588 589template <> // Added in C++14 590struct owner_less<void> 591{ 592 template <class _Tp, class _Up> 593 bool operator()( shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept; 594 template <class _Tp, class _Up> 595 bool operator()( shared_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept; 596 template <class _Tp, class _Up> 597 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept; 598 template <class _Tp, class _Up> 599 bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept; 600 601 typedef void is_transparent; 602}; 603 604template<class T> 605class enable_shared_from_this 606{ 607protected: 608 constexpr enable_shared_from_this() noexcept; 609 enable_shared_from_this(enable_shared_from_this const&) noexcept; 610 enable_shared_from_this& operator=(enable_shared_from_this const&) noexcept; 611 ~enable_shared_from_this(); 612public: 613 shared_ptr<T> shared_from_this(); 614 shared_ptr<T const> shared_from_this() const; 615}; 616 617template<class T> 618 bool atomic_is_lock_free(const shared_ptr<T>* p); 619template<class T> 620 shared_ptr<T> atomic_load(const shared_ptr<T>* p); 621template<class T> 622 shared_ptr<T> atomic_load_explicit(const shared_ptr<T>* p, memory_order mo); 623template<class T> 624 void atomic_store(shared_ptr<T>* p, shared_ptr<T> r); 625template<class T> 626 void atomic_store_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo); 627template<class T> 628 shared_ptr<T> atomic_exchange(shared_ptr<T>* p, shared_ptr<T> r); 629template<class T> 630 shared_ptr<T> 631 atomic_exchange_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo); 632template<class T> 633 bool 634 atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w); 635template<class T> 636 bool 637 atomic_compare_exchange_strong( shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w); 638template<class T> 639 bool 640 atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v, 641 shared_ptr<T> w, memory_order success, 642 memory_order failure); 643template<class T> 644 bool 645 atomic_compare_exchange_strong_explicit(shared_ptr<T>* p, shared_ptr<T>* v, 646 shared_ptr<T> w, memory_order success, 647 memory_order failure); 648// Hash support 649template <class T> struct hash; 650template <class T, class D> struct hash<unique_ptr<T, D> >; 651template <class T> struct hash<shared_ptr<T> >; 652 653template <class T, class Alloc> 654 inline constexpr bool uses_allocator_v = uses_allocator<T, Alloc>::value; 655 656// Pointer safety 657enum class pointer_safety { relaxed, preferred, strict }; // since C++11 658void declare_reachable(void *p); // since C++11 659template <class T> T *undeclare_reachable(T *p); // since C++11 660void declare_no_pointers(char *p, size_t n); // since C++11 661void undeclare_no_pointers(char *p, size_t n); // since C++11 662pointer_safety get_pointer_safety() noexcept; // since C++11 663 664void* align(size_t alignment, size_t size, void*& ptr, size_t& space); 665 666} // std 667 668*/ 669 670#include <__config> 671#include <__functional_base> 672#include <__memory/addressof.h> 673#include <__memory/allocation_guard.h> 674#include <__memory/allocator.h> 675#include <__memory/allocator_arg_t.h> 676#include <__memory/allocator_traits.h> 677#include <__memory/compressed_pair.h> 678#include <__memory/construct_at.h> 679#include <__memory/pointer_safety.h> 680#include <__memory/pointer_traits.h> 681#include <__memory/raw_storage_iterator.h> 682#include <__memory/shared_ptr.h> 683#include <__memory/temporary_buffer.h> 684#include <__memory/uninitialized_algorithms.h> 685#include <__memory/unique_ptr.h> 686#include <__memory/uses_allocator.h> 687#include <compare> 688#include <cstddef> 689#include <cstdint> 690#include <cstring> 691#include <iosfwd> 692#include <iterator> 693#include <new> 694#include <stdexcept> 695#include <tuple> 696#include <type_traits> 697#include <typeinfo> 698#include <utility> 699#include <version> 700 701#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) 702# include <__memory/auto_ptr.h> 703#endif 704 705#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 706#pragma GCC system_header 707#endif 708 709_LIBCPP_PUSH_MACROS 710#include <__undef_macros> 711 712 713_LIBCPP_BEGIN_NAMESPACE_STD 714 715template <class _Alloc, class _Ptr> 716_LIBCPP_INLINE_VISIBILITY 717void __construct_forward_with_exception_guarantees(_Alloc& __a, _Ptr __begin1, _Ptr __end1, _Ptr& __begin2) { 718 static_assert(__is_cpp17_move_insertable<_Alloc>::value, 719 "The specified type does not meet the requirements of Cpp17MoveInsertable"); 720 typedef allocator_traits<_Alloc> _Traits; 721 for (; __begin1 != __end1; ++__begin1, (void)++__begin2) { 722 _Traits::construct(__a, _VSTD::__to_address(__begin2), 723#ifdef _LIBCPP_NO_EXCEPTIONS 724 _VSTD::move(*__begin1) 725#else 726 _VSTD::move_if_noexcept(*__begin1) 727#endif 728 ); 729 } 730} 731 732template <class _Alloc, class _Tp, typename enable_if< 733 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Tp*, _Tp>::value) && 734 is_trivially_move_constructible<_Tp>::value 735>::type> 736_LIBCPP_INLINE_VISIBILITY 737void __construct_forward_with_exception_guarantees(_Alloc&, _Tp* __begin1, _Tp* __end1, _Tp*& __begin2) { 738 ptrdiff_t _Np = __end1 - __begin1; 739 if (_Np > 0) { 740 _VSTD::memcpy(__begin2, __begin1, _Np * sizeof(_Tp)); 741 __begin2 += _Np; 742 } 743} 744 745template <class _Alloc, class _Iter, class _Ptr> 746_LIBCPP_INLINE_VISIBILITY 747void __construct_range_forward(_Alloc& __a, _Iter __begin1, _Iter __end1, _Ptr& __begin2) { 748 typedef allocator_traits<_Alloc> _Traits; 749 for (; __begin1 != __end1; ++__begin1, (void) ++__begin2) { 750 _Traits::construct(__a, _VSTD::__to_address(__begin2), *__begin1); 751 } 752} 753 754template <class _Alloc, class _Source, class _Dest, 755 class _RawSource = typename remove_const<_Source>::type, 756 class _RawDest = typename remove_const<_Dest>::type, 757 class = 758 typename enable_if< 759 is_trivially_copy_constructible<_Dest>::value && 760 is_same<_RawSource, _RawDest>::value && 761 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Dest*, _Source&>::value) 762 >::type> 763_LIBCPP_INLINE_VISIBILITY 764void __construct_range_forward(_Alloc&, _Source* __begin1, _Source* __end1, _Dest*& __begin2) { 765 ptrdiff_t _Np = __end1 - __begin1; 766 if (_Np > 0) { 767 _VSTD::memcpy(const_cast<_RawDest*>(__begin2), __begin1, _Np * sizeof(_Dest)); 768 __begin2 += _Np; 769 } 770} 771 772template <class _Alloc, class _Ptr> 773_LIBCPP_INLINE_VISIBILITY 774void __construct_backward_with_exception_guarantees(_Alloc& __a, _Ptr __begin1, _Ptr __end1, _Ptr& __end2) { 775 static_assert(__is_cpp17_move_insertable<_Alloc>::value, 776 "The specified type does not meet the requirements of Cpp17MoveInsertable"); 777 typedef allocator_traits<_Alloc> _Traits; 778 while (__end1 != __begin1) { 779 _Traits::construct(__a, _VSTD::__to_address(__end2 - 1), 780#ifdef _LIBCPP_NO_EXCEPTIONS 781 _VSTD::move(*--__end1) 782#else 783 _VSTD::move_if_noexcept(*--__end1) 784#endif 785 ); 786 --__end2; 787 } 788} 789 790template <class _Alloc, class _Tp, class = typename enable_if< 791 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Tp*, _Tp>::value) && 792 is_trivially_move_constructible<_Tp>::value 793>::type> 794_LIBCPP_INLINE_VISIBILITY 795void __construct_backward_with_exception_guarantees(_Alloc&, _Tp* __begin1, _Tp* __end1, _Tp*& __end2) { 796 ptrdiff_t _Np = __end1 - __begin1; 797 __end2 -= _Np; 798 if (_Np > 0) 799 _VSTD::memcpy(static_cast<void*>(__end2), static_cast<void const*>(__begin1), _Np * sizeof(_Tp)); 800} 801 802struct __destruct_n 803{ 804private: 805 size_t __size_; 806 807 template <class _Tp> 808 _LIBCPP_INLINE_VISIBILITY void __process(_Tp* __p, false_type) _NOEXCEPT 809 {for (size_t __i = 0; __i < __size_; ++__i, ++__p) __p->~_Tp();} 810 811 template <class _Tp> 812 _LIBCPP_INLINE_VISIBILITY void __process(_Tp*, true_type) _NOEXCEPT 813 {} 814 815 _LIBCPP_INLINE_VISIBILITY void __incr(false_type) _NOEXCEPT 816 {++__size_;} 817 _LIBCPP_INLINE_VISIBILITY void __incr(true_type) _NOEXCEPT 818 {} 819 820 _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, false_type) _NOEXCEPT 821 {__size_ = __s;} 822 _LIBCPP_INLINE_VISIBILITY void __set(size_t, true_type) _NOEXCEPT 823 {} 824public: 825 _LIBCPP_INLINE_VISIBILITY explicit __destruct_n(size_t __s) _NOEXCEPT 826 : __size_(__s) {} 827 828 template <class _Tp> 829 _LIBCPP_INLINE_VISIBILITY void __incr() _NOEXCEPT 830 {__incr(integral_constant<bool, is_trivially_destructible<_Tp>::value>());} 831 832 template <class _Tp> 833 _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, _Tp*) _NOEXCEPT 834 {__set(__s, integral_constant<bool, is_trivially_destructible<_Tp>::value>());} 835 836 template <class _Tp> 837 _LIBCPP_INLINE_VISIBILITY void operator()(_Tp* __p) _NOEXCEPT 838 {__process(__p, integral_constant<bool, is_trivially_destructible<_Tp>::value>());} 839}; 840 841_LIBCPP_FUNC_VIS void* align(size_t __align, size_t __sz, void*& __ptr, size_t& __space); 842 843// --- Helper for container swap -- 844template <typename _Alloc> 845_LIBCPP_INLINE_VISIBILITY 846void __swap_allocator(_Alloc & __a1, _Alloc & __a2, true_type) 847#if _LIBCPP_STD_VER >= 14 848 _NOEXCEPT 849#else 850 _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value) 851#endif 852{ 853 using _VSTD::swap; 854 swap(__a1, __a2); 855} 856 857template <typename _Alloc> 858inline _LIBCPP_INLINE_VISIBILITY 859void __swap_allocator(_Alloc &, _Alloc &, false_type) _NOEXCEPT {} 860 861template <typename _Alloc> 862inline _LIBCPP_INLINE_VISIBILITY 863void __swap_allocator(_Alloc & __a1, _Alloc & __a2) 864#if _LIBCPP_STD_VER >= 14 865 _NOEXCEPT 866#else 867 _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value) 868#endif 869{ 870 _VSTD::__swap_allocator(__a1, __a2, 871 integral_constant<bool, allocator_traits<_Alloc>::propagate_on_container_swap::value>()); 872} 873 874template <typename _Alloc, typename _Traits=allocator_traits<_Alloc> > 875struct __noexcept_move_assign_container : public integral_constant<bool, 876 _Traits::propagate_on_container_move_assignment::value 877#if _LIBCPP_STD_VER > 14 878 || _Traits::is_always_equal::value 879#else 880 && is_nothrow_move_assignable<_Alloc>::value 881#endif 882 > {}; 883 884 885template <class _Tp, class _Alloc> 886struct __temp_value { 887 typedef allocator_traits<_Alloc> _Traits; 888 889 typename aligned_storage<sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)>::type __v; 890 _Alloc &__a; 891 892 _Tp *__addr() { return reinterpret_cast<_Tp *>(addressof(__v)); } 893 _Tp & get() { return *__addr(); } 894 895 template<class... _Args> 896 _LIBCPP_NO_CFI 897 __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc) { 898 _Traits::construct(__a, reinterpret_cast<_Tp*>(addressof(__v)), 899 _VSTD::forward<_Args>(__args)...); 900 } 901 902 ~__temp_value() { _Traits::destroy(__a, __addr()); } 903 }; 904 905template<typename _Alloc, typename = void, typename = void> 906struct __is_allocator : false_type {}; 907 908template<typename _Alloc> 909struct __is_allocator<_Alloc, 910 typename __void_t<typename _Alloc::value_type>::type, 911 typename __void_t<decltype(declval<_Alloc&>().allocate(size_t(0)))>::type 912 > 913 : true_type {}; 914 915// __builtin_new_allocator -- A non-templated helper for allocating and 916// deallocating memory using __builtin_operator_new and 917// __builtin_operator_delete. It should be used in preference to 918// `std::allocator<T>` to avoid additional instantiations. 919struct __builtin_new_allocator { 920 struct __builtin_new_deleter { 921 typedef void* pointer_type; 922 923 _LIBCPP_CONSTEXPR explicit __builtin_new_deleter(size_t __size, size_t __align) 924 : __size_(__size), __align_(__align) {} 925 926 void operator()(void* p) const _NOEXCEPT { 927 _VSTD::__libcpp_deallocate(p, __size_, __align_); 928 } 929 930 private: 931 size_t __size_; 932 size_t __align_; 933 }; 934 935 typedef unique_ptr<void, __builtin_new_deleter> __holder_t; 936 937 static __holder_t __allocate_bytes(size_t __s, size_t __align) { 938 return __holder_t(_VSTD::__libcpp_allocate(__s, __align), 939 __builtin_new_deleter(__s, __align)); 940 } 941 942 static void __deallocate_bytes(void* __p, size_t __s, 943 size_t __align) _NOEXCEPT { 944 _VSTD::__libcpp_deallocate(__p, __s, __align); 945 } 946 947 template <class _Tp> 948 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE 949 static __holder_t __allocate_type(size_t __n) { 950 return __allocate_bytes(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)); 951 } 952 953 template <class _Tp> 954 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE 955 static void __deallocate_type(void* __p, size_t __n) _NOEXCEPT { 956 __deallocate_bytes(__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)); 957 } 958}; 959 960 961_LIBCPP_END_NAMESPACE_STD 962 963_LIBCPP_POP_MACROS 964 965#if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17 966# include <__pstl_memory> 967#endif 968 969#endif // _LIBCPP_MEMORY 970