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 16 namespace std 17 { 18 19 struct allocator_arg_t { }; 20 inline constexpr allocator_arg_t allocator_arg = allocator_arg_t(); 21 22 template <class T, class Alloc> struct uses_allocator; 23 24 template <class Ptr> 25 struct 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 36 template <class T> 37 struct 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 48 template <class T> constexpr T* to_address(T* p) noexcept; // C++20 49 template <class Ptr> constexpr auto to_address(const Ptr& p) noexcept; // C++20 50 51 template <class Alloc> 52 struct 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 }; 100 101 template <> 102 class allocator<void> // deprecated in C++17, removed in C++20 103 { 104 public: 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 }; 111 112 template <class T> 113 class allocator 114 { 115 public: 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 }; 148 149 template <class T, class U> 150 bool operator==(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20 151 152 template <class T, class U> 153 bool operator!=(const allocator<T>&, const allocator<U>&) noexcept; // constexpr in C++20 154 155 template <class OutputIterator, class T> 156 class raw_storage_iterator 157 : public iterator<output_iterator_tag, 158 T, // purposefully not C++03 159 ptrdiff_t, // purposefully not C++03 160 T*, // purposefully not C++03 161 raw_storage_iterator&> // purposefully not C++03 162 { 163 public: 164 explicit raw_storage_iterator(OutputIterator x); 165 raw_storage_iterator& operator*(); 166 raw_storage_iterator& operator=(const T& element); 167 raw_storage_iterator& operator++(); 168 raw_storage_iterator operator++(int); 169 }; 170 171 template <class T> pair<T*,ptrdiff_t> get_temporary_buffer(ptrdiff_t n) noexcept; 172 template <class T> void return_temporary_buffer(T* p) noexcept; 173 174 template <class T> T* addressof(T& r) noexcept; 175 template <class T> T* addressof(const T&& r) noexcept = delete; 176 177 template <class InputIterator, class ForwardIterator> 178 ForwardIterator 179 uninitialized_copy(InputIterator first, InputIterator last, ForwardIterator result); 180 181 template <class InputIterator, class Size, class ForwardIterator> 182 ForwardIterator 183 uninitialized_copy_n(InputIterator first, Size n, ForwardIterator result); 184 185 template <class ForwardIterator, class T> 186 void uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x); 187 188 template <class ForwardIterator, class Size, class T> 189 ForwardIterator 190 uninitialized_fill_n(ForwardIterator first, Size n, const T& x); 191 192 template <class T, class ...Args> 193 constexpr T* construct_at(T* location, Args&& ...args); // since C++20 194 195 template <class T> 196 void destroy_at(T* location); // constexpr in C++20 197 198 template <class ForwardIterator> 199 void destroy(ForwardIterator first, ForwardIterator last); // constexpr in C++20 200 201 template <class ForwardIterator, class Size> 202 ForwardIterator destroy_n(ForwardIterator first, Size n); // constexpr in C++20 203 204 template <class InputIterator, class ForwardIterator> 205 ForwardIterator uninitialized_move(InputIterator first, InputIterator last, ForwardIterator result); 206 207 template <class InputIterator, class Size, class ForwardIterator> 208 pair<InputIterator,ForwardIterator> uninitialized_move_n(InputIterator first, Size n, ForwardIterator result); 209 210 template <class ForwardIterator> 211 void uninitialized_value_construct(ForwardIterator first, ForwardIterator last); 212 213 template <class ForwardIterator, class Size> 214 ForwardIterator uninitialized_value_construct_n(ForwardIterator first, Size n); 215 216 template <class ForwardIterator> 217 void uninitialized_default_construct(ForwardIterator first, ForwardIterator last); 218 219 template <class ForwardIterator, class Size> 220 ForwardIterator uninitialized_default_construct_n(ForwardIterator first, Size n); 221 222 template <class Y> struct auto_ptr_ref {}; // deprecated in C++11, removed in C++17 223 224 template<class X> 225 class auto_ptr // deprecated in C++11, removed in C++17 226 { 227 public: 228 typedef X element_type; 229 230 explicit auto_ptr(X* p =0) throw(); 231 auto_ptr(auto_ptr&) throw(); 232 template<class Y> auto_ptr(auto_ptr<Y>&) throw(); 233 auto_ptr& operator=(auto_ptr&) throw(); 234 template<class Y> auto_ptr& operator=(auto_ptr<Y>&) throw(); 235 auto_ptr& operator=(auto_ptr_ref<X> r) throw(); 236 ~auto_ptr() throw(); 237 238 typename add_lvalue_reference<X>::type operator*() const throw(); 239 X* operator->() const throw(); 240 X* get() const throw(); 241 X* release() throw(); 242 void reset(X* p =0) throw(); 243 244 auto_ptr(auto_ptr_ref<X>) throw(); 245 template<class Y> operator auto_ptr_ref<Y>() throw(); 246 template<class Y> operator auto_ptr<Y>() throw(); 247 }; 248 249 template <class T> 250 struct default_delete 251 { 252 constexpr default_delete() noexcept = default; 253 template <class U> default_delete(const default_delete<U>&) noexcept; 254 255 void operator()(T*) const noexcept; 256 }; 257 258 template <class T> 259 struct default_delete<T[]> 260 { 261 constexpr default_delete() noexcept = default; 262 void operator()(T*) const noexcept; 263 template <class U> void operator()(U*) const = delete; 264 }; 265 266 template <class T, class D = default_delete<T>> 267 class unique_ptr 268 { 269 public: 270 typedef see below pointer; 271 typedef T element_type; 272 typedef D deleter_type; 273 274 // constructors 275 constexpr unique_ptr() noexcept; 276 explicit unique_ptr(pointer p) noexcept; 277 unique_ptr(pointer p, see below d1) noexcept; 278 unique_ptr(pointer p, see below d2) noexcept; 279 unique_ptr(unique_ptr&& u) noexcept; 280 unique_ptr(nullptr_t) noexcept : unique_ptr() { } 281 template <class U, class E> 282 unique_ptr(unique_ptr<U, E>&& u) noexcept; 283 template <class U> 284 unique_ptr(auto_ptr<U>&& u) noexcept; // removed in C++17 285 286 // destructor 287 ~unique_ptr(); 288 289 // assignment 290 unique_ptr& operator=(unique_ptr&& u) noexcept; 291 template <class U, class E> unique_ptr& operator=(unique_ptr<U, E>&& u) noexcept; 292 unique_ptr& operator=(nullptr_t) noexcept; 293 294 // observers 295 typename add_lvalue_reference<T>::type operator*() const; 296 pointer operator->() const noexcept; 297 pointer get() const noexcept; 298 deleter_type& get_deleter() noexcept; 299 const deleter_type& get_deleter() const noexcept; 300 explicit operator bool() const noexcept; 301 302 // modifiers 303 pointer release() noexcept; 304 void reset(pointer p = pointer()) noexcept; 305 void swap(unique_ptr& u) noexcept; 306 }; 307 308 template <class T, class D> 309 class unique_ptr<T[], D> 310 { 311 public: 312 typedef implementation-defined pointer; 313 typedef T element_type; 314 typedef D deleter_type; 315 316 // constructors 317 constexpr unique_ptr() noexcept; 318 explicit unique_ptr(pointer p) noexcept; 319 unique_ptr(pointer p, see below d) noexcept; 320 unique_ptr(pointer p, see below d) noexcept; 321 unique_ptr(unique_ptr&& u) noexcept; 322 unique_ptr(nullptr_t) noexcept : unique_ptr() { } 323 324 // destructor 325 ~unique_ptr(); 326 327 // assignment 328 unique_ptr& operator=(unique_ptr&& u) noexcept; 329 unique_ptr& operator=(nullptr_t) noexcept; 330 331 // observers 332 T& operator[](size_t i) const; 333 pointer get() const noexcept; 334 deleter_type& get_deleter() noexcept; 335 const deleter_type& get_deleter() const noexcept; 336 explicit operator bool() const noexcept; 337 338 // modifiers 339 pointer release() noexcept; 340 void reset(pointer p = pointer()) noexcept; 341 void reset(nullptr_t) noexcept; 342 template <class U> void reset(U) = delete; 343 void swap(unique_ptr& u) noexcept; 344 }; 345 346 template <class T, class D> 347 void swap(unique_ptr<T, D>& x, unique_ptr<T, D>& y) noexcept; 348 349 template <class T1, class D1, class T2, class D2> 350 bool operator==(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 351 template <class T1, class D1, class T2, class D2> 352 bool operator!=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 353 template <class T1, class D1, class T2, class D2> 354 bool operator<(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 355 template <class T1, class D1, class T2, class D2> 356 bool operator<=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 357 template <class T1, class D1, class T2, class D2> 358 bool operator>(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 359 template <class T1, class D1, class T2, class D2> 360 bool operator>=(const unique_ptr<T1, D1>& x, const unique_ptr<T2, D2>& y); 361 362 template <class T, class D> 363 bool operator==(const unique_ptr<T, D>& x, nullptr_t) noexcept; 364 template <class T, class D> 365 bool operator==(nullptr_t, const unique_ptr<T, D>& y) noexcept; 366 template <class T, class D> 367 bool operator!=(const unique_ptr<T, D>& x, nullptr_t) noexcept; 368 template <class T, class D> 369 bool operator!=(nullptr_t, const unique_ptr<T, D>& y) noexcept; 370 371 template <class T, class D> 372 bool operator<(const unique_ptr<T, D>& x, nullptr_t); 373 template <class T, class D> 374 bool operator<(nullptr_t, const unique_ptr<T, D>& y); 375 template <class T, class D> 376 bool operator<=(const unique_ptr<T, D>& x, nullptr_t); 377 template <class T, class D> 378 bool operator<=(nullptr_t, const unique_ptr<T, D>& y); 379 template <class T, class D> 380 bool operator>(const unique_ptr<T, D>& x, nullptr_t); 381 template <class T, class D> 382 bool operator>(nullptr_t, const unique_ptr<T, D>& y); 383 template <class T, class D> 384 bool operator>=(const unique_ptr<T, D>& x, nullptr_t); 385 template <class T, class D> 386 bool operator>=(nullptr_t, const unique_ptr<T, D>& y); 387 388 class bad_weak_ptr 389 : public std::exception 390 { 391 bad_weak_ptr() noexcept; 392 }; 393 394 template<class T, class... Args> unique_ptr<T> make_unique(Args&&... args); // C++14 395 template<class T> unique_ptr<T> make_unique(size_t n); // C++14 396 template<class T, class... Args> unspecified make_unique(Args&&...) = delete; // C++14, T == U[N] 397 398 template<class E, class T, class Y, class D> 399 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, unique_ptr<Y, D> const& p); 400 401 template<class T> 402 class shared_ptr 403 { 404 public: 405 typedef T element_type; 406 typedef weak_ptr<T> weak_type; // C++17 407 408 // constructors: 409 constexpr shared_ptr() noexcept; 410 template<class Y> explicit shared_ptr(Y* p); 411 template<class Y, class D> shared_ptr(Y* p, D d); 412 template<class Y, class D, class A> shared_ptr(Y* p, D d, A a); 413 template <class D> shared_ptr(nullptr_t p, D d); 414 template <class D, class A> shared_ptr(nullptr_t p, D d, A a); 415 template<class Y> shared_ptr(const shared_ptr<Y>& r, T *p) noexcept; 416 shared_ptr(const shared_ptr& r) noexcept; 417 template<class Y> shared_ptr(const shared_ptr<Y>& r) noexcept; 418 shared_ptr(shared_ptr&& r) noexcept; 419 template<class Y> shared_ptr(shared_ptr<Y>&& r) noexcept; 420 template<class Y> explicit shared_ptr(const weak_ptr<Y>& r); 421 template<class Y> shared_ptr(auto_ptr<Y>&& r); // removed in C++17 422 template <class Y, class D> shared_ptr(unique_ptr<Y, D>&& r); 423 shared_ptr(nullptr_t) : shared_ptr() { } 424 425 // destructor: 426 ~shared_ptr(); 427 428 // assignment: 429 shared_ptr& operator=(const shared_ptr& r) noexcept; 430 template<class Y> shared_ptr& operator=(const shared_ptr<Y>& r) noexcept; 431 shared_ptr& operator=(shared_ptr&& r) noexcept; 432 template<class Y> shared_ptr& operator=(shared_ptr<Y>&& r); 433 template<class Y> shared_ptr& operator=(auto_ptr<Y>&& r); // removed in C++17 434 template <class Y, class D> shared_ptr& operator=(unique_ptr<Y, D>&& r); 435 436 // modifiers: 437 void swap(shared_ptr& r) noexcept; 438 void reset() noexcept; 439 template<class Y> void reset(Y* p); 440 template<class Y, class D> void reset(Y* p, D d); 441 template<class Y, class D, class A> void reset(Y* p, D d, A a); 442 443 // observers: 444 T* get() const noexcept; 445 T& operator*() const noexcept; 446 T* operator->() const noexcept; 447 long use_count() const noexcept; 448 bool unique() const noexcept; 449 explicit operator bool() const noexcept; 450 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept; 451 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept; 452 }; 453 454 template<class T> 455 shared_ptr(weak_ptr<T>) -> shared_ptr<T>; 456 template<class T, class D> 457 shared_ptr(unique_ptr<T, D>) -> shared_ptr<T>; 458 459 // shared_ptr comparisons: 460 template<class T, class U> 461 bool operator==(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 462 template<class T, class U> 463 bool operator!=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 464 template<class T, class U> 465 bool operator<(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 466 template<class T, class U> 467 bool operator>(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 468 template<class T, class U> 469 bool operator<=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 470 template<class T, class U> 471 bool operator>=(shared_ptr<T> const& a, shared_ptr<U> const& b) noexcept; 472 473 template <class T> 474 bool operator==(const shared_ptr<T>& x, nullptr_t) noexcept; 475 template <class T> 476 bool operator==(nullptr_t, const shared_ptr<T>& y) noexcept; 477 template <class T> 478 bool operator!=(const shared_ptr<T>& x, nullptr_t) noexcept; 479 template <class T> 480 bool operator!=(nullptr_t, const shared_ptr<T>& y) noexcept; 481 template <class T> 482 bool operator<(const shared_ptr<T>& x, nullptr_t) noexcept; 483 template <class T> 484 bool operator<(nullptr_t, const shared_ptr<T>& y) noexcept; 485 template <class T> 486 bool operator<=(const shared_ptr<T>& x, nullptr_t) noexcept; 487 template <class T> 488 bool operator<=(nullptr_t, const shared_ptr<T>& y) noexcept; 489 template <class T> 490 bool operator>(const shared_ptr<T>& x, nullptr_t) noexcept; 491 template <class T> 492 bool operator>(nullptr_t, const shared_ptr<T>& y) noexcept; 493 template <class T> 494 bool operator>=(const shared_ptr<T>& x, nullptr_t) noexcept; 495 template <class T> 496 bool operator>=(nullptr_t, const shared_ptr<T>& y) noexcept; 497 498 // shared_ptr specialized algorithms: 499 template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b) noexcept; 500 501 // shared_ptr casts: 502 template<class T, class U> 503 shared_ptr<T> static_pointer_cast(shared_ptr<U> const& r) noexcept; 504 template<class T, class U> 505 shared_ptr<T> dynamic_pointer_cast(shared_ptr<U> const& r) noexcept; 506 template<class T, class U> 507 shared_ptr<T> const_pointer_cast(shared_ptr<U> const& r) noexcept; 508 509 // shared_ptr I/O: 510 template<class E, class T, class Y> 511 basic_ostream<E, T>& operator<< (basic_ostream<E, T>& os, shared_ptr<Y> const& p); 512 513 // shared_ptr get_deleter: 514 template<class D, class T> D* get_deleter(shared_ptr<T> const& p) noexcept; 515 516 template<class T, class... Args> 517 shared_ptr<T> make_shared(Args&&... args); 518 template<class T, class A, class... Args> 519 shared_ptr<T> allocate_shared(const A& a, Args&&... args); 520 521 template<class T> 522 class weak_ptr 523 { 524 public: 525 typedef T element_type; 526 527 // constructors 528 constexpr weak_ptr() noexcept; 529 template<class Y> weak_ptr(shared_ptr<Y> const& r) noexcept; 530 weak_ptr(weak_ptr const& r) noexcept; 531 template<class Y> weak_ptr(weak_ptr<Y> const& r) noexcept; 532 weak_ptr(weak_ptr&& r) noexcept; // C++14 533 template<class Y> weak_ptr(weak_ptr<Y>&& r) noexcept; // C++14 534 535 // destructor 536 ~weak_ptr(); 537 538 // assignment 539 weak_ptr& operator=(weak_ptr const& r) noexcept; 540 template<class Y> weak_ptr& operator=(weak_ptr<Y> const& r) noexcept; 541 template<class Y> weak_ptr& operator=(shared_ptr<Y> const& r) noexcept; 542 weak_ptr& operator=(weak_ptr&& r) noexcept; // C++14 543 template<class Y> weak_ptr& operator=(weak_ptr<Y>&& r) noexcept; // C++14 544 545 // modifiers 546 void swap(weak_ptr& r) noexcept; 547 void reset() noexcept; 548 549 // observers 550 long use_count() const noexcept; 551 bool expired() const noexcept; 552 shared_ptr<T> lock() const noexcept; 553 template<class U> bool owner_before(shared_ptr<U> const& b) const noexcept; 554 template<class U> bool owner_before(weak_ptr<U> const& b) const noexcept; 555 }; 556 557 template<class T> 558 weak_ptr(shared_ptr<T>) -> weak_ptr<T>; 559 560 // weak_ptr specialized algorithms: 561 template<class T> void swap(weak_ptr<T>& a, weak_ptr<T>& b) noexcept; 562 563 // class owner_less: 564 template<class T> struct owner_less; 565 566 template<class T> 567 struct owner_less<shared_ptr<T> > 568 : binary_function<shared_ptr<T>, shared_ptr<T>, bool> 569 { 570 typedef bool result_type; 571 bool operator()(shared_ptr<T> const&, shared_ptr<T> const&) const noexcept; 572 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept; 573 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept; 574 }; 575 576 template<class T> 577 struct owner_less<weak_ptr<T> > 578 : binary_function<weak_ptr<T>, weak_ptr<T>, bool> 579 { 580 typedef bool result_type; 581 bool operator()(weak_ptr<T> const&, weak_ptr<T> const&) const noexcept; 582 bool operator()(shared_ptr<T> const&, weak_ptr<T> const&) const noexcept; 583 bool operator()(weak_ptr<T> const&, shared_ptr<T> const&) const noexcept; 584 }; 585 586 template <> // Added in C++14 587 struct owner_less<void> 588 { 589 template <class _Tp, class _Up> 590 bool operator()( shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept; 591 template <class _Tp, class _Up> 592 bool operator()( shared_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept; 593 template <class _Tp, class _Up> 594 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const noexcept; 595 template <class _Tp, class _Up> 596 bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const noexcept; 597 598 typedef void is_transparent; 599 }; 600 601 template<class T> 602 class enable_shared_from_this 603 { 604 protected: 605 constexpr enable_shared_from_this() noexcept; 606 enable_shared_from_this(enable_shared_from_this const&) noexcept; 607 enable_shared_from_this& operator=(enable_shared_from_this const&) noexcept; 608 ~enable_shared_from_this(); 609 public: 610 shared_ptr<T> shared_from_this(); 611 shared_ptr<T const> shared_from_this() const; 612 }; 613 614 template<class T> 615 bool atomic_is_lock_free(const shared_ptr<T>* p); 616 template<class T> 617 shared_ptr<T> atomic_load(const shared_ptr<T>* p); 618 template<class T> 619 shared_ptr<T> atomic_load_explicit(const shared_ptr<T>* p, memory_order mo); 620 template<class T> 621 void atomic_store(shared_ptr<T>* p, shared_ptr<T> r); 622 template<class T> 623 void atomic_store_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo); 624 template<class T> 625 shared_ptr<T> atomic_exchange(shared_ptr<T>* p, shared_ptr<T> r); 626 template<class T> 627 shared_ptr<T> 628 atomic_exchange_explicit(shared_ptr<T>* p, shared_ptr<T> r, memory_order mo); 629 template<class T> 630 bool 631 atomic_compare_exchange_weak(shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w); 632 template<class T> 633 bool 634 atomic_compare_exchange_strong( shared_ptr<T>* p, shared_ptr<T>* v, shared_ptr<T> w); 635 template<class T> 636 bool 637 atomic_compare_exchange_weak_explicit(shared_ptr<T>* p, shared_ptr<T>* v, 638 shared_ptr<T> w, memory_order success, 639 memory_order failure); 640 template<class T> 641 bool 642 atomic_compare_exchange_strong_explicit(shared_ptr<T>* p, shared_ptr<T>* v, 643 shared_ptr<T> w, memory_order success, 644 memory_order failure); 645 // Hash support 646 template <class T> struct hash; 647 template <class T, class D> struct hash<unique_ptr<T, D> >; 648 template <class T> struct hash<shared_ptr<T> >; 649 650 template <class T, class Alloc> 651 inline constexpr bool uses_allocator_v = uses_allocator<T, Alloc>::value; 652 653 // Pointer safety 654 enum class pointer_safety { relaxed, preferred, strict }; // since C++11 655 void declare_reachable(void *p); // since C++11 656 template <class T> T *undeclare_reachable(T *p); // since C++11 657 void declare_no_pointers(char *p, size_t n); // since C++11 658 void undeclare_no_pointers(char *p, size_t n); // since C++11 659 pointer_safety get_pointer_safety() noexcept; // since C++11 660 661 void* align(size_t alignment, size_t size, void*& ptr, size_t& space); 662 663 } // std 664 665 */ 666 667 #include <__config> 668 #include <type_traits> 669 #include <typeinfo> 670 #include <compare> 671 #include <cstddef> 672 #include <cstdint> 673 #include <new> 674 #include <utility> 675 #include <iterator> 676 #include <__functional_base> 677 #include <iosfwd> 678 #include <tuple> 679 #include <stdexcept> 680 #include <cstring> 681 #include <__memory/addressof.h> 682 #include <__memory/allocation_guard.h> 683 #include <__memory/allocator.h> 684 #include <__memory/allocator_traits.h> 685 #include <__memory/compressed_pair.h> 686 #include <__memory/construct_at.h> 687 #include <__memory/pointer_safety.h> 688 #include <__memory/pointer_traits.h> 689 #include <__memory/raw_storage_iterator.h> 690 #include <__memory/shared_ptr.h> 691 #include <__memory/temporary_buffer.h> 692 #include <__memory/uninitialized_algorithms.h> 693 #include <__memory/unique_ptr.h> 694 #include <version> 695 696 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) 697 # include <__memory/auto_ptr.h> 698 #endif 699 700 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 701 #pragma GCC system_header 702 #endif 703 704 _LIBCPP_PUSH_MACROS 705 #include <__undef_macros> 706 707 708 _LIBCPP_BEGIN_NAMESPACE_STD 709 710 template <class _Alloc, class _Ptr> 711 _LIBCPP_INLINE_VISIBILITY 712 void __construct_forward_with_exception_guarantees(_Alloc& __a, _Ptr __begin1, _Ptr __end1, _Ptr& __begin2) { 713 static_assert(__is_cpp17_move_insertable<_Alloc>::value, 714 "The specified type does not meet the requirements of Cpp17MoveInsertable"); 715 typedef allocator_traits<_Alloc> _Traits; 716 for (; __begin1 != __end1; ++__begin1, (void)++__begin2) { 717 _Traits::construct(__a, _VSTD::__to_address(__begin2), 718 #ifdef _LIBCPP_NO_EXCEPTIONS 719 _VSTD::move(*__begin1) 720 #else 721 _VSTD::move_if_noexcept(*__begin1) 722 #endif 723 ); 724 } 725 } 726 727 template <class _Alloc, class _Tp, typename enable_if< 728 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Tp*, _Tp>::value) && 729 is_trivially_move_constructible<_Tp>::value 730 >::type> 731 _LIBCPP_INLINE_VISIBILITY 732 void __construct_forward_with_exception_guarantees(_Alloc&, _Tp* __begin1, _Tp* __end1, _Tp*& __begin2) { 733 ptrdiff_t _Np = __end1 - __begin1; 734 if (_Np > 0) { 735 _VSTD::memcpy(__begin2, __begin1, _Np * sizeof(_Tp)); 736 __begin2 += _Np; 737 } 738 } 739 740 template <class _Alloc, class _Iter, class _Ptr> 741 _LIBCPP_INLINE_VISIBILITY 742 void __construct_range_forward(_Alloc& __a, _Iter __begin1, _Iter __end1, _Ptr& __begin2) { 743 typedef allocator_traits<_Alloc> _Traits; 744 for (; __begin1 != __end1; ++__begin1, (void) ++__begin2) { 745 _Traits::construct(__a, _VSTD::__to_address(__begin2), *__begin1); 746 } 747 } 748 749 template <class _Alloc, class _Source, class _Dest, 750 class _RawSource = typename remove_const<_Source>::type, 751 class _RawDest = typename remove_const<_Dest>::type, 752 class = 753 typename enable_if< 754 is_trivially_copy_constructible<_Dest>::value && 755 is_same<_RawSource, _RawDest>::value && 756 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Dest*, _Source&>::value) 757 >::type> 758 _LIBCPP_INLINE_VISIBILITY 759 void __construct_range_forward(_Alloc&, _Source* __begin1, _Source* __end1, _Dest*& __begin2) { 760 ptrdiff_t _Np = __end1 - __begin1; 761 if (_Np > 0) { 762 _VSTD::memcpy(const_cast<_RawDest*>(__begin2), __begin1, _Np * sizeof(_Dest)); 763 __begin2 += _Np; 764 } 765 } 766 767 template <class _Alloc, class _Ptr> 768 _LIBCPP_INLINE_VISIBILITY 769 void __construct_backward_with_exception_guarantees(_Alloc& __a, _Ptr __begin1, _Ptr __end1, _Ptr& __end2) { 770 static_assert(__is_cpp17_move_insertable<_Alloc>::value, 771 "The specified type does not meet the requirements of Cpp17MoveInsertable"); 772 typedef allocator_traits<_Alloc> _Traits; 773 while (__end1 != __begin1) { 774 _Traits::construct(__a, _VSTD::__to_address(__end2 - 1), 775 #ifdef _LIBCPP_NO_EXCEPTIONS 776 _VSTD::move(*--__end1) 777 #else 778 _VSTD::move_if_noexcept(*--__end1) 779 #endif 780 ); 781 --__end2; 782 } 783 } 784 785 template <class _Alloc, class _Tp, class = typename enable_if< 786 (__is_default_allocator<_Alloc>::value || !__has_construct<_Alloc, _Tp*, _Tp>::value) && 787 is_trivially_move_constructible<_Tp>::value 788 >::type> 789 _LIBCPP_INLINE_VISIBILITY 790 void __construct_backward_with_exception_guarantees(_Alloc&, _Tp* __begin1, _Tp* __end1, _Tp*& __end2) { 791 ptrdiff_t _Np = __end1 - __begin1; 792 __end2 -= _Np; 793 if (_Np > 0) 794 _VSTD::memcpy(__end2, __begin1, _Np * sizeof(_Tp)); 795 } 796 797 struct __destruct_n 798 { 799 private: 800 size_t __size_; 801 802 template <class _Tp> 803 _LIBCPP_INLINE_VISIBILITY void __process(_Tp* __p, false_type) _NOEXCEPT 804 {for (size_t __i = 0; __i < __size_; ++__i, ++__p) __p->~_Tp();} 805 806 template <class _Tp> 807 _LIBCPP_INLINE_VISIBILITY void __process(_Tp*, true_type) _NOEXCEPT 808 {} 809 810 _LIBCPP_INLINE_VISIBILITY void __incr(false_type) _NOEXCEPT 811 {++__size_;} 812 _LIBCPP_INLINE_VISIBILITY void __incr(true_type) _NOEXCEPT 813 {} 814 815 _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, false_type) _NOEXCEPT 816 {__size_ = __s;} 817 _LIBCPP_INLINE_VISIBILITY void __set(size_t, true_type) _NOEXCEPT 818 {} 819 public: 820 _LIBCPP_INLINE_VISIBILITY explicit __destruct_n(size_t __s) _NOEXCEPT 821 : __size_(__s) {} 822 823 template <class _Tp> 824 _LIBCPP_INLINE_VISIBILITY void __incr() _NOEXCEPT 825 {__incr(integral_constant<bool, is_trivially_destructible<_Tp>::value>());} 826 827 template <class _Tp> 828 _LIBCPP_INLINE_VISIBILITY void __set(size_t __s, _Tp*) _NOEXCEPT 829 {__set(__s, integral_constant<bool, is_trivially_destructible<_Tp>::value>());} 830 831 template <class _Tp> 832 _LIBCPP_INLINE_VISIBILITY void operator()(_Tp* __p) _NOEXCEPT 833 {__process(__p, integral_constant<bool, is_trivially_destructible<_Tp>::value>());} 834 }; 835 836 _LIBCPP_FUNC_VIS void* align(size_t __align, size_t __sz, void*& __ptr, size_t& __space); 837 838 // --- Helper for container swap -- 839 template <typename _Alloc> 840 _LIBCPP_INLINE_VISIBILITY 841 void __swap_allocator(_Alloc & __a1, _Alloc & __a2, true_type) 842 #if _LIBCPP_STD_VER >= 14 843 _NOEXCEPT 844 #else 845 _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value) 846 #endif 847 { 848 using _VSTD::swap; 849 swap(__a1, __a2); 850 } 851 852 template <typename _Alloc> 853 inline _LIBCPP_INLINE_VISIBILITY 854 void __swap_allocator(_Alloc &, _Alloc &, false_type) _NOEXCEPT {} 855 856 template <typename _Alloc> 857 inline _LIBCPP_INLINE_VISIBILITY 858 void __swap_allocator(_Alloc & __a1, _Alloc & __a2) 859 #if _LIBCPP_STD_VER >= 14 860 _NOEXCEPT 861 #else 862 _NOEXCEPT_(__is_nothrow_swappable<_Alloc>::value) 863 #endif 864 { 865 _VSTD::__swap_allocator(__a1, __a2, 866 integral_constant<bool, allocator_traits<_Alloc>::propagate_on_container_swap::value>()); 867 } 868 869 template <typename _Alloc, typename _Traits=allocator_traits<_Alloc> > 870 struct __noexcept_move_assign_container : public integral_constant<bool, 871 _Traits::propagate_on_container_move_assignment::value 872 #if _LIBCPP_STD_VER > 14 873 || _Traits::is_always_equal::value 874 #else 875 && is_nothrow_move_assignable<_Alloc>::value 876 #endif 877 > {}; 878 879 880 template <class _Tp, class _Alloc> 881 struct __temp_value { 882 typedef allocator_traits<_Alloc> _Traits; 883 884 typename aligned_storage<sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)>::type __v; 885 _Alloc &__a; 886 887 _Tp *__addr() { return reinterpret_cast<_Tp *>(addressof(__v)); } 888 _Tp & get() { return *__addr(); } 889 890 template<class... _Args> 891 _LIBCPP_NO_CFI 892 __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc) { 893 _Traits::construct(__a, reinterpret_cast<_Tp*>(addressof(__v)), 894 _VSTD::forward<_Args>(__args)...); 895 } 896 897 ~__temp_value() { _Traits::destroy(__a, __addr()); } 898 }; 899 900 template<typename _Alloc, typename = void, typename = void> 901 struct __is_allocator : false_type {}; 902 903 template<typename _Alloc> 904 struct __is_allocator<_Alloc, 905 typename __void_t<typename _Alloc::value_type>::type, 906 typename __void_t<decltype(declval<_Alloc&>().allocate(size_t(0)))>::type 907 > 908 : true_type {}; 909 910 // __builtin_new_allocator -- A non-templated helper for allocating and 911 // deallocating memory using __builtin_operator_new and 912 // __builtin_operator_delete. It should be used in preference to 913 // `std::allocator<T>` to avoid additional instantiations. 914 struct __builtin_new_allocator { 915 struct __builtin_new_deleter { 916 typedef void* pointer_type; 917 918 _LIBCPP_CONSTEXPR explicit __builtin_new_deleter(size_t __size, size_t __align) 919 : __size_(__size), __align_(__align) {} 920 921 void operator()(void* p) const _NOEXCEPT { 922 _VSTD::__libcpp_deallocate(p, __size_, __align_); 923 } 924 925 private: 926 size_t __size_; 927 size_t __align_; 928 }; 929 930 typedef unique_ptr<void, __builtin_new_deleter> __holder_t; 931 932 static __holder_t __allocate_bytes(size_t __s, size_t __align) { 933 return __holder_t(_VSTD::__libcpp_allocate(__s, __align), 934 __builtin_new_deleter(__s, __align)); 935 } 936 937 static void __deallocate_bytes(void* __p, size_t __s, 938 size_t __align) _NOEXCEPT { 939 _VSTD::__libcpp_deallocate(__p, __s, __align); 940 } 941 942 template <class _Tp> 943 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE 944 static __holder_t __allocate_type(size_t __n) { 945 return __allocate_bytes(__n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)); 946 } 947 948 template <class _Tp> 949 _LIBCPP_NODEBUG _LIBCPP_ALWAYS_INLINE 950 static void __deallocate_type(void* __p, size_t __n) _NOEXCEPT { 951 __deallocate_bytes(__p, __n * sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)); 952 } 953 }; 954 955 956 _LIBCPP_END_NAMESPACE_STD 957 958 _LIBCPP_POP_MACROS 959 960 #if defined(_LIBCPP_HAS_PARALLEL_ALGORITHMS) && _LIBCPP_STD_VER >= 17 961 # include <__pstl_memory> 962 #endif 963 964 #endif // _LIBCPP_MEMORY 965
Indexes created Sun Oct 18 00:25:03 UTC 2026