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_SHARED_PTR_H 11 #define _LIBCPP___MEMORY_SHARED_PTR_H 12 13 #include <__availability> 14 #include <__config> 15 #include <__functional/binary_function.h> 16 #include <__functional/operations.h> 17 #include <__functional/reference_wrapper.h> 18 #include <__iterator/access.h> 19 #include <__memory/addressof.h> 20 #include <__memory/allocation_guard.h> 21 #include <__memory/allocator.h> 22 #include <__memory/allocator_traits.h> 23 #include <__memory/auto_ptr.h> 24 #include <__memory/compressed_pair.h> 25 #include <__memory/construct_at.h> 26 #include <__memory/pointer_traits.h> 27 #include <__memory/uninitialized_algorithms.h> 28 #include <__memory/unique_ptr.h> 29 #include <__utility/forward.h> 30 #include <__utility/move.h> 31 #include <__utility/swap.h> 32 #include <cstddef> 33 #include <cstdlib> // abort 34 #include <iosfwd> 35 #include <stdexcept> 36 #include <type_traits> 37 #include <typeinfo> 38 #if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER) 39 # include <atomic> 40 #endif 41 42 43 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 44 # pragma GCC system_header 45 #endif 46 47 _LIBCPP_BEGIN_NAMESPACE_STD 48 49 template <class _Alloc> 50 class __allocator_destructor 51 { 52 typedef _LIBCPP_NODEBUG allocator_traits<_Alloc> __alloc_traits; 53 public: 54 typedef _LIBCPP_NODEBUG typename __alloc_traits::pointer pointer; 55 typedef _LIBCPP_NODEBUG typename __alloc_traits::size_type size_type; 56 private: 57 _Alloc& __alloc_; 58 size_type __s_; 59 public: 60 _LIBCPP_INLINE_VISIBILITY __allocator_destructor(_Alloc& __a, size_type __s) 61 _NOEXCEPT 62 : __alloc_(__a), __s_(__s) {} 63 _LIBCPP_INLINE_VISIBILITY 64 void operator()(pointer __p) _NOEXCEPT 65 {__alloc_traits::deallocate(__alloc_, __p, __s_);} 66 }; 67 68 // NOTE: Relaxed and acq/rel atomics (for increment and decrement respectively) 69 // should be sufficient for thread safety. 70 // See https://llvm.org/PR22803 71 #if defined(__clang__) && __has_builtin(__atomic_add_fetch) \ 72 && defined(__ATOMIC_RELAXED) \ 73 && defined(__ATOMIC_ACQ_REL) 74 # define _LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT 75 #elif defined(_LIBCPP_COMPILER_GCC) 76 # define _LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT 77 #endif 78 79 template <class _ValueType> 80 inline _LIBCPP_INLINE_VISIBILITY 81 _ValueType __libcpp_relaxed_load(_ValueType const* __value) { 82 #if !defined(_LIBCPP_HAS_NO_THREADS) && \ 83 defined(__ATOMIC_RELAXED) && \ 84 (__has_builtin(__atomic_load_n) || defined(_LIBCPP_COMPILER_GCC)) 85 return __atomic_load_n(__value, __ATOMIC_RELAXED); 86 #else 87 return *__value; 88 #endif 89 } 90 91 template <class _ValueType> 92 inline _LIBCPP_INLINE_VISIBILITY 93 _ValueType __libcpp_acquire_load(_ValueType const* __value) { 94 #if !defined(_LIBCPP_HAS_NO_THREADS) && \ 95 defined(__ATOMIC_ACQUIRE) && \ 96 (__has_builtin(__atomic_load_n) || defined(_LIBCPP_COMPILER_GCC)) 97 return __atomic_load_n(__value, __ATOMIC_ACQUIRE); 98 #else 99 return *__value; 100 #endif 101 } 102 103 template <class _Tp> 104 inline _LIBCPP_INLINE_VISIBILITY _Tp 105 __libcpp_atomic_refcount_increment(_Tp& __t) _NOEXCEPT 106 { 107 #if defined(_LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT) && !defined(_LIBCPP_HAS_NO_THREADS) 108 return __atomic_add_fetch(&__t, 1, __ATOMIC_RELAXED); 109 #else 110 return __t += 1; 111 #endif 112 } 113 114 template <class _Tp> 115 inline _LIBCPP_INLINE_VISIBILITY _Tp 116 __libcpp_atomic_refcount_decrement(_Tp& __t) _NOEXCEPT 117 { 118 #if defined(_LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT) && !defined(_LIBCPP_HAS_NO_THREADS) 119 return __atomic_add_fetch(&__t, -1, __ATOMIC_ACQ_REL); 120 #else 121 return __t -= 1; 122 #endif 123 } 124 125 class _LIBCPP_EXCEPTION_ABI bad_weak_ptr 126 : public std::exception 127 { 128 public: 129 bad_weak_ptr() _NOEXCEPT = default; 130 bad_weak_ptr(const bad_weak_ptr&) _NOEXCEPT = default; 131 virtual ~bad_weak_ptr() _NOEXCEPT; 132 virtual const char* what() const _NOEXCEPT; 133 }; 134 135 _LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY 136 void __throw_bad_weak_ptr() 137 { 138 #ifndef _LIBCPP_NO_EXCEPTIONS 139 throw bad_weak_ptr(); 140 #else 141 _VSTD::abort(); 142 #endif 143 } 144 145 template<class _Tp> class _LIBCPP_TEMPLATE_VIS weak_ptr; 146 147 class _LIBCPP_TYPE_VIS __shared_count 148 { 149 __shared_count(const __shared_count&); 150 __shared_count& operator=(const __shared_count&); 151 152 protected: 153 long __shared_owners_; 154 virtual ~__shared_count(); 155 private: 156 virtual void __on_zero_shared() _NOEXCEPT = 0; 157 158 public: 159 _LIBCPP_INLINE_VISIBILITY 160 explicit __shared_count(long __refs = 0) _NOEXCEPT 161 : __shared_owners_(__refs) {} 162 163 #if defined(_LIBCPP_SHARED_PTR_DEFINE_LEGACY_INLINE_FUNCTIONS) 164 void __add_shared() noexcept; 165 bool __release_shared() noexcept; 166 #else 167 _LIBCPP_INLINE_VISIBILITY 168 void __add_shared() _NOEXCEPT { 169 __libcpp_atomic_refcount_increment(__shared_owners_); 170 } 171 _LIBCPP_INLINE_VISIBILITY 172 bool __release_shared() _NOEXCEPT { 173 if (__libcpp_atomic_refcount_decrement(__shared_owners_) == -1) { 174 __on_zero_shared(); 175 return true; 176 } 177 return false; 178 } 179 #endif 180 _LIBCPP_INLINE_VISIBILITY 181 long use_count() const _NOEXCEPT { 182 return __libcpp_relaxed_load(&__shared_owners_) + 1; 183 } 184 }; 185 186 class _LIBCPP_TYPE_VIS __shared_weak_count 187 : private __shared_count 188 { 189 long __shared_weak_owners_; 190 191 public: 192 _LIBCPP_INLINE_VISIBILITY 193 explicit __shared_weak_count(long __refs = 0) _NOEXCEPT 194 : __shared_count(__refs), 195 __shared_weak_owners_(__refs) {} 196 protected: 197 virtual ~__shared_weak_count(); 198 199 public: 200 #if defined(_LIBCPP_SHARED_PTR_DEFINE_LEGACY_INLINE_FUNCTIONS) 201 void __add_shared() noexcept; 202 void __add_weak() noexcept; 203 void __release_shared() noexcept; 204 #else 205 _LIBCPP_INLINE_VISIBILITY 206 void __add_shared() _NOEXCEPT { 207 __shared_count::__add_shared(); 208 } 209 _LIBCPP_INLINE_VISIBILITY 210 void __add_weak() _NOEXCEPT { 211 __libcpp_atomic_refcount_increment(__shared_weak_owners_); 212 } 213 _LIBCPP_INLINE_VISIBILITY 214 void __release_shared() _NOEXCEPT { 215 if (__shared_count::__release_shared()) 216 __release_weak(); 217 } 218 #endif 219 void __release_weak() _NOEXCEPT; 220 _LIBCPP_INLINE_VISIBILITY 221 long use_count() const _NOEXCEPT {return __shared_count::use_count();} 222 __shared_weak_count* lock() _NOEXCEPT; 223 224 virtual const void* __get_deleter(const type_info&) const _NOEXCEPT; 225 private: 226 virtual void __on_zero_shared_weak() _NOEXCEPT = 0; 227 }; 228 229 template <class _Tp, class _Dp, class _Alloc> 230 class __shared_ptr_pointer 231 : public __shared_weak_count 232 { 233 __compressed_pair<__compressed_pair<_Tp, _Dp>, _Alloc> __data_; 234 public: 235 _LIBCPP_INLINE_VISIBILITY 236 __shared_ptr_pointer(_Tp __p, _Dp __d, _Alloc __a) 237 : __data_(__compressed_pair<_Tp, _Dp>(__p, _VSTD::move(__d)), _VSTD::move(__a)) {} 238 239 #ifndef _LIBCPP_NO_RTTI 240 virtual const void* __get_deleter(const type_info&) const _NOEXCEPT; 241 #endif 242 243 private: 244 virtual void __on_zero_shared() _NOEXCEPT; 245 virtual void __on_zero_shared_weak() _NOEXCEPT; 246 }; 247 248 #ifndef _LIBCPP_NO_RTTI 249 250 template <class _Tp, class _Dp, class _Alloc> 251 const void* 252 __shared_ptr_pointer<_Tp, _Dp, _Alloc>::__get_deleter(const type_info& __t) const _NOEXCEPT 253 { 254 return __t == typeid(_Dp) ? _VSTD::addressof(__data_.first().second()) : nullptr; 255 } 256 257 #endif // _LIBCPP_NO_RTTI 258 259 template <class _Tp, class _Dp, class _Alloc> 260 void 261 __shared_ptr_pointer<_Tp, _Dp, _Alloc>::__on_zero_shared() _NOEXCEPT 262 { 263 __data_.first().second()(__data_.first().first()); 264 __data_.first().second().~_Dp(); 265 } 266 267 template <class _Tp, class _Dp, class _Alloc> 268 void 269 __shared_ptr_pointer<_Tp, _Dp, _Alloc>::__on_zero_shared_weak() _NOEXCEPT 270 { 271 typedef typename __allocator_traits_rebind<_Alloc, __shared_ptr_pointer>::type _Al; 272 typedef allocator_traits<_Al> _ATraits; 273 typedef pointer_traits<typename _ATraits::pointer> _PTraits; 274 275 _Al __a(__data_.second()); 276 __data_.second().~_Alloc(); 277 __a.deallocate(_PTraits::pointer_to(*this), 1); 278 } 279 280 template <class _Tp, class _Alloc> 281 struct __shared_ptr_emplace 282 : __shared_weak_count 283 { 284 template<class ..._Args> 285 _LIBCPP_HIDE_FROM_ABI 286 explicit __shared_ptr_emplace(_Alloc __a, _Args&& ...__args) 287 : __storage_(_VSTD::move(__a)) 288 { 289 #if _LIBCPP_STD_VER > 17 290 using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type; 291 _TpAlloc __tmp(*__get_alloc()); 292 allocator_traits<_TpAlloc>::construct(__tmp, __get_elem(), _VSTD::forward<_Args>(__args)...); 293 #else 294 ::new ((void*)__get_elem()) _Tp(_VSTD::forward<_Args>(__args)...); 295 #endif 296 } 297 298 _LIBCPP_HIDE_FROM_ABI 299 _Alloc* __get_alloc() _NOEXCEPT { return __storage_.__get_alloc(); } 300 301 _LIBCPP_HIDE_FROM_ABI 302 _Tp* __get_elem() _NOEXCEPT { return __storage_.__get_elem(); } 303 304 private: 305 virtual void __on_zero_shared() _NOEXCEPT { 306 #if _LIBCPP_STD_VER > 17 307 using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type; 308 _TpAlloc __tmp(*__get_alloc()); 309 allocator_traits<_TpAlloc>::destroy(__tmp, __get_elem()); 310 #else 311 __get_elem()->~_Tp(); 312 #endif 313 } 314 315 virtual void __on_zero_shared_weak() _NOEXCEPT { 316 using _ControlBlockAlloc = typename __allocator_traits_rebind<_Alloc, __shared_ptr_emplace>::type; 317 using _ControlBlockPointer = typename allocator_traits<_ControlBlockAlloc>::pointer; 318 _ControlBlockAlloc __tmp(*__get_alloc()); 319 __storage_.~_Storage(); 320 allocator_traits<_ControlBlockAlloc>::deallocate(__tmp, 321 pointer_traits<_ControlBlockPointer>::pointer_to(*this), 1); 322 } 323 324 // This class implements the control block for non-array shared pointers created 325 // through `std::allocate_shared` and `std::make_shared`. 326 // 327 // In previous versions of the library, we used a compressed pair to store 328 // both the _Alloc and the _Tp. This implies using EBO, which is incompatible 329 // with Allocator construction for _Tp. To allow implementing P0674 in C++20, 330 // we now use a properly aligned char buffer while making sure that we maintain 331 // the same layout that we had when we used a compressed pair. 332 using _CompressedPair = __compressed_pair<_Alloc, _Tp>; 333 struct _ALIGNAS_TYPE(_CompressedPair) _Storage { 334 char __blob_[sizeof(_CompressedPair)]; 335 336 _LIBCPP_HIDE_FROM_ABI explicit _Storage(_Alloc&& __a) { 337 ::new ((void*)__get_alloc()) _Alloc(_VSTD::move(__a)); 338 } 339 _LIBCPP_HIDE_FROM_ABI ~_Storage() { 340 __get_alloc()->~_Alloc(); 341 } 342 _Alloc* __get_alloc() _NOEXCEPT { 343 _CompressedPair *__as_pair = reinterpret_cast<_CompressedPair*>(__blob_); 344 typename _CompressedPair::_Base1* __first = _CompressedPair::__get_first_base(__as_pair); 345 _Alloc *__alloc = reinterpret_cast<_Alloc*>(__first); 346 return __alloc; 347 } 348 _LIBCPP_NO_CFI _Tp* __get_elem() _NOEXCEPT { 349 _CompressedPair *__as_pair = reinterpret_cast<_CompressedPair*>(__blob_); 350 typename _CompressedPair::_Base2* __second = _CompressedPair::__get_second_base(__as_pair); 351 _Tp *__elem = reinterpret_cast<_Tp*>(__second); 352 return __elem; 353 } 354 }; 355 356 static_assert(_LIBCPP_ALIGNOF(_Storage) == _LIBCPP_ALIGNOF(_CompressedPair), ""); 357 static_assert(sizeof(_Storage) == sizeof(_CompressedPair), ""); 358 _Storage __storage_; 359 }; 360 361 struct __shared_ptr_dummy_rebind_allocator_type; 362 template <> 363 class _LIBCPP_TEMPLATE_VIS allocator<__shared_ptr_dummy_rebind_allocator_type> 364 { 365 public: 366 template <class _Other> 367 struct rebind 368 { 369 typedef allocator<_Other> other; 370 }; 371 }; 372 373 template<class _Tp> class _LIBCPP_TEMPLATE_VIS enable_shared_from_this; 374 375 template<class _Tp, class _Up> 376 struct __compatible_with 377 #if _LIBCPP_STD_VER > 14 378 : is_convertible<remove_extent_t<_Tp>*, remove_extent_t<_Up>*> {}; 379 #else 380 : is_convertible<_Tp*, _Up*> {}; 381 #endif // _LIBCPP_STD_VER > 14 382 383 template <class _Ptr, class = void> 384 struct __is_deletable : false_type { }; 385 template <class _Ptr> 386 struct __is_deletable<_Ptr, decltype(delete declval<_Ptr>())> : true_type { }; 387 388 template <class _Ptr, class = void> 389 struct __is_array_deletable : false_type { }; 390 template <class _Ptr> 391 struct __is_array_deletable<_Ptr, decltype(delete[] declval<_Ptr>())> : true_type { }; 392 393 template <class _Dp, class _Pt, 394 class = decltype(declval<_Dp>()(declval<_Pt>()))> 395 static true_type __well_formed_deleter_test(int); 396 397 template <class, class> 398 static false_type __well_formed_deleter_test(...); 399 400 template <class _Dp, class _Pt> 401 struct __well_formed_deleter : decltype(__well_formed_deleter_test<_Dp, _Pt>(0)) {}; 402 403 template<class _Dp, class _Tp, class _Yp> 404 struct __shared_ptr_deleter_ctor_reqs 405 { 406 static const bool value = __compatible_with<_Tp, _Yp>::value && 407 is_move_constructible<_Dp>::value && 408 __well_formed_deleter<_Dp, _Tp*>::value; 409 }; 410 411 #if defined(_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI) 412 # define _LIBCPP_SHARED_PTR_TRIVIAL_ABI __attribute__((trivial_abi)) 413 #else 414 # define _LIBCPP_SHARED_PTR_TRIVIAL_ABI 415 #endif 416 417 template<class _Tp> 418 class _LIBCPP_SHARED_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS shared_ptr 419 { 420 public: 421 #if _LIBCPP_STD_VER > 14 422 typedef weak_ptr<_Tp> weak_type; 423 typedef remove_extent_t<_Tp> element_type; 424 #else 425 typedef _Tp element_type; 426 #endif 427 428 private: 429 element_type* __ptr_; 430 __shared_weak_count* __cntrl_; 431 432 public: 433 _LIBCPP_HIDE_FROM_ABI 434 _LIBCPP_CONSTEXPR shared_ptr() _NOEXCEPT 435 : __ptr_(nullptr), 436 __cntrl_(nullptr) 437 { } 438 439 _LIBCPP_HIDE_FROM_ABI 440 _LIBCPP_CONSTEXPR shared_ptr(nullptr_t) _NOEXCEPT 441 : __ptr_(nullptr), 442 __cntrl_(nullptr) 443 { } 444 445 template<class _Yp, class = __enable_if_t< 446 _And< 447 __compatible_with<_Yp, _Tp> 448 // In C++03 we get errors when trying to do SFINAE with the 449 // delete operator, so we always pretend that it's deletable. 450 // The same happens on GCC. 451 #if !defined(_LIBCPP_CXX03_LANG) && !defined(_LIBCPP_COMPILER_GCC) 452 , _If<is_array<_Tp>::value, __is_array_deletable<_Yp*>, __is_deletable<_Yp*> > 453 #endif 454 >::value 455 > > 456 explicit shared_ptr(_Yp* __p) : __ptr_(__p) { 457 unique_ptr<_Yp> __hold(__p); 458 typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; 459 typedef __shared_ptr_pointer<_Yp*, __shared_ptr_default_delete<_Tp, _Yp>, _AllocT> _CntrlBlk; 460 __cntrl_ = new _CntrlBlk(__p, __shared_ptr_default_delete<_Tp, _Yp>(), _AllocT()); 461 __hold.release(); 462 __enable_weak_this(__p, __p); 463 } 464 465 template<class _Yp, class _Dp, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value> > 466 _LIBCPP_HIDE_FROM_ABI 467 shared_ptr(_Yp* __p, _Dp __d) 468 : __ptr_(__p) 469 { 470 #ifndef _LIBCPP_NO_EXCEPTIONS 471 try 472 { 473 #endif // _LIBCPP_NO_EXCEPTIONS 474 typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; 475 typedef __shared_ptr_pointer<_Yp*, _Dp, _AllocT> _CntrlBlk; 476 #ifndef _LIBCPP_CXX03_LANG 477 __cntrl_ = new _CntrlBlk(__p, _VSTD::move(__d), _AllocT()); 478 #else 479 __cntrl_ = new _CntrlBlk(__p, __d, _AllocT()); 480 #endif // not _LIBCPP_CXX03_LANG 481 __enable_weak_this(__p, __p); 482 #ifndef _LIBCPP_NO_EXCEPTIONS 483 } 484 catch (...) 485 { 486 __d(__p); 487 throw; 488 } 489 #endif // _LIBCPP_NO_EXCEPTIONS 490 } 491 492 template<class _Yp, class _Dp, class _Alloc, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value> > 493 _LIBCPP_HIDE_FROM_ABI 494 shared_ptr(_Yp* __p, _Dp __d, _Alloc __a) 495 : __ptr_(__p) 496 { 497 #ifndef _LIBCPP_NO_EXCEPTIONS 498 try 499 { 500 #endif // _LIBCPP_NO_EXCEPTIONS 501 typedef __shared_ptr_pointer<_Yp*, _Dp, _Alloc> _CntrlBlk; 502 typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2; 503 typedef __allocator_destructor<_A2> _D2; 504 _A2 __a2(__a); 505 unique_ptr<_CntrlBlk, _D2> __hold2(__a2.allocate(1), _D2(__a2, 1)); 506 ::new ((void*)_VSTD::addressof(*__hold2.get())) 507 #ifndef _LIBCPP_CXX03_LANG 508 _CntrlBlk(__p, _VSTD::move(__d), __a); 509 #else 510 _CntrlBlk(__p, __d, __a); 511 #endif // not _LIBCPP_CXX03_LANG 512 __cntrl_ = _VSTD::addressof(*__hold2.release()); 513 __enable_weak_this(__p, __p); 514 #ifndef _LIBCPP_NO_EXCEPTIONS 515 } 516 catch (...) 517 { 518 __d(__p); 519 throw; 520 } 521 #endif // _LIBCPP_NO_EXCEPTIONS 522 } 523 524 template<class _Dp> 525 _LIBCPP_HIDE_FROM_ABI 526 shared_ptr(nullptr_t __p, _Dp __d) 527 : __ptr_(nullptr) 528 { 529 #ifndef _LIBCPP_NO_EXCEPTIONS 530 try 531 { 532 #endif // _LIBCPP_NO_EXCEPTIONS 533 typedef typename __shared_ptr_default_allocator<_Tp>::type _AllocT; 534 typedef __shared_ptr_pointer<nullptr_t, _Dp, _AllocT> _CntrlBlk; 535 #ifndef _LIBCPP_CXX03_LANG 536 __cntrl_ = new _CntrlBlk(__p, _VSTD::move(__d), _AllocT()); 537 #else 538 __cntrl_ = new _CntrlBlk(__p, __d, _AllocT()); 539 #endif // not _LIBCPP_CXX03_LANG 540 #ifndef _LIBCPP_NO_EXCEPTIONS 541 } 542 catch (...) 543 { 544 __d(__p); 545 throw; 546 } 547 #endif // _LIBCPP_NO_EXCEPTIONS 548 } 549 550 template<class _Dp, class _Alloc> 551 _LIBCPP_HIDE_FROM_ABI 552 shared_ptr(nullptr_t __p, _Dp __d, _Alloc __a) 553 : __ptr_(nullptr) 554 { 555 #ifndef _LIBCPP_NO_EXCEPTIONS 556 try 557 { 558 #endif // _LIBCPP_NO_EXCEPTIONS 559 typedef __shared_ptr_pointer<nullptr_t, _Dp, _Alloc> _CntrlBlk; 560 typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2; 561 typedef __allocator_destructor<_A2> _D2; 562 _A2 __a2(__a); 563 unique_ptr<_CntrlBlk, _D2> __hold2(__a2.allocate(1), _D2(__a2, 1)); 564 ::new ((void*)_VSTD::addressof(*__hold2.get())) 565 #ifndef _LIBCPP_CXX03_LANG 566 _CntrlBlk(__p, _VSTD::move(__d), __a); 567 #else 568 _CntrlBlk(__p, __d, __a); 569 #endif // not _LIBCPP_CXX03_LANG 570 __cntrl_ = _VSTD::addressof(*__hold2.release()); 571 #ifndef _LIBCPP_NO_EXCEPTIONS 572 } 573 catch (...) 574 { 575 __d(__p); 576 throw; 577 } 578 #endif // _LIBCPP_NO_EXCEPTIONS 579 } 580 581 template<class _Yp> 582 _LIBCPP_HIDE_FROM_ABI 583 shared_ptr(const shared_ptr<_Yp>& __r, element_type *__p) _NOEXCEPT 584 : __ptr_(__p), 585 __cntrl_(__r.__cntrl_) 586 { 587 if (__cntrl_) 588 __cntrl_->__add_shared(); 589 } 590 591 _LIBCPP_HIDE_FROM_ABI 592 shared_ptr(const shared_ptr& __r) _NOEXCEPT 593 : __ptr_(__r.__ptr_), 594 __cntrl_(__r.__cntrl_) 595 { 596 if (__cntrl_) 597 __cntrl_->__add_shared(); 598 } 599 600 template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> > 601 _LIBCPP_HIDE_FROM_ABI 602 shared_ptr(const shared_ptr<_Yp>& __r) _NOEXCEPT 603 : __ptr_(__r.__ptr_), 604 __cntrl_(__r.__cntrl_) 605 { 606 if (__cntrl_) 607 __cntrl_->__add_shared(); 608 } 609 610 _LIBCPP_HIDE_FROM_ABI 611 shared_ptr(shared_ptr&& __r) _NOEXCEPT 612 : __ptr_(__r.__ptr_), 613 __cntrl_(__r.__cntrl_) 614 { 615 __r.__ptr_ = nullptr; 616 __r.__cntrl_ = nullptr; 617 } 618 619 template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> > 620 _LIBCPP_HIDE_FROM_ABI 621 shared_ptr(shared_ptr<_Yp>&& __r) _NOEXCEPT 622 : __ptr_(__r.__ptr_), 623 __cntrl_(__r.__cntrl_) 624 { 625 __r.__ptr_ = nullptr; 626 __r.__cntrl_ = nullptr; 627 } 628 629 template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> > 630 _LIBCPP_HIDE_FROM_ABI 631 explicit shared_ptr(const weak_ptr<_Yp>& __r) 632 : __ptr_(__r.__ptr_), 633 __cntrl_(__r.__cntrl_ ? __r.__cntrl_->lock() : __r.__cntrl_) 634 { 635 if (__cntrl_ == nullptr) 636 __throw_bad_weak_ptr(); 637 } 638 639 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) 640 template<class _Yp, class = __enable_if_t<is_convertible<_Yp*, element_type*>::value> > 641 _LIBCPP_HIDE_FROM_ABI 642 shared_ptr(auto_ptr<_Yp>&& __r) 643 : __ptr_(__r.get()) 644 { 645 typedef __shared_ptr_pointer<_Yp*, default_delete<_Yp>, allocator<_Yp> > _CntrlBlk; 646 __cntrl_ = new _CntrlBlk(__r.get(), default_delete<_Yp>(), allocator<_Yp>()); 647 __enable_weak_this(__r.get(), __r.get()); 648 __r.release(); 649 } 650 #endif 651 652 template <class _Yp, class _Dp, class = __enable_if_t< 653 !is_lvalue_reference<_Dp>::value && 654 is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value 655 > > 656 _LIBCPP_HIDE_FROM_ABI 657 shared_ptr(unique_ptr<_Yp, _Dp>&& __r) 658 : __ptr_(__r.get()) 659 { 660 #if _LIBCPP_STD_VER > 11 661 if (__ptr_ == nullptr) 662 __cntrl_ = nullptr; 663 else 664 #endif 665 { 666 typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; 667 typedef __shared_ptr_pointer<typename unique_ptr<_Yp, _Dp>::pointer, _Dp, _AllocT> _CntrlBlk; 668 __cntrl_ = new _CntrlBlk(__r.get(), std::move(__r.get_deleter()), _AllocT()); 669 __enable_weak_this(__r.get(), __r.get()); 670 } 671 __r.release(); 672 } 673 674 template <class _Yp, class _Dp, class = void, class = __enable_if_t< 675 is_lvalue_reference<_Dp>::value && 676 is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value 677 > > 678 _LIBCPP_HIDE_FROM_ABI 679 shared_ptr(unique_ptr<_Yp, _Dp>&& __r) 680 : __ptr_(__r.get()) 681 { 682 #if _LIBCPP_STD_VER > 11 683 if (__ptr_ == nullptr) 684 __cntrl_ = nullptr; 685 else 686 #endif 687 { 688 typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; 689 typedef __shared_ptr_pointer<typename unique_ptr<_Yp, _Dp>::pointer, 690 reference_wrapper<typename remove_reference<_Dp>::type>, 691 _AllocT> _CntrlBlk; 692 __cntrl_ = new _CntrlBlk(__r.get(), _VSTD::ref(__r.get_deleter()), _AllocT()); 693 __enable_weak_this(__r.get(), __r.get()); 694 } 695 __r.release(); 696 } 697 698 _LIBCPP_HIDE_FROM_ABI 699 ~shared_ptr() 700 { 701 if (__cntrl_) 702 __cntrl_->__release_shared(); 703 } 704 705 _LIBCPP_HIDE_FROM_ABI 706 shared_ptr<_Tp>& operator=(const shared_ptr& __r) _NOEXCEPT 707 { 708 shared_ptr(__r).swap(*this); 709 return *this; 710 } 711 712 template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> > 713 _LIBCPP_HIDE_FROM_ABI 714 shared_ptr<_Tp>& operator=(const shared_ptr<_Yp>& __r) _NOEXCEPT 715 { 716 shared_ptr(__r).swap(*this); 717 return *this; 718 } 719 720 _LIBCPP_HIDE_FROM_ABI 721 shared_ptr<_Tp>& operator=(shared_ptr&& __r) _NOEXCEPT 722 { 723 shared_ptr(_VSTD::move(__r)).swap(*this); 724 return *this; 725 } 726 727 template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> > 728 _LIBCPP_HIDE_FROM_ABI 729 shared_ptr<_Tp>& operator=(shared_ptr<_Yp>&& __r) 730 { 731 shared_ptr(_VSTD::move(__r)).swap(*this); 732 return *this; 733 } 734 735 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) 736 template<class _Yp, class = __enable_if_t< 737 !is_array<_Yp>::value && 738 is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value 739 > > 740 _LIBCPP_HIDE_FROM_ABI 741 shared_ptr<_Tp>& operator=(auto_ptr<_Yp>&& __r) 742 { 743 shared_ptr(_VSTD::move(__r)).swap(*this); 744 return *this; 745 } 746 #endif 747 748 template <class _Yp, class _Dp, class = __enable_if_t< 749 is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value 750 > > 751 _LIBCPP_HIDE_FROM_ABI 752 shared_ptr<_Tp>& operator=(unique_ptr<_Yp, _Dp>&& __r) 753 { 754 shared_ptr(_VSTD::move(__r)).swap(*this); 755 return *this; 756 } 757 758 _LIBCPP_HIDE_FROM_ABI 759 void swap(shared_ptr& __r) _NOEXCEPT 760 { 761 _VSTD::swap(__ptr_, __r.__ptr_); 762 _VSTD::swap(__cntrl_, __r.__cntrl_); 763 } 764 765 _LIBCPP_HIDE_FROM_ABI 766 void reset() _NOEXCEPT 767 { 768 shared_ptr().swap(*this); 769 } 770 771 template<class _Yp, class = __enable_if_t< 772 __compatible_with<_Yp, _Tp>::value 773 > > 774 _LIBCPP_HIDE_FROM_ABI 775 void reset(_Yp* __p) 776 { 777 shared_ptr(__p).swap(*this); 778 } 779 780 template<class _Yp, class _Dp, class = __enable_if_t< 781 __compatible_with<_Yp, _Tp>::value 782 > > 783 _LIBCPP_HIDE_FROM_ABI 784 void reset(_Yp* __p, _Dp __d) 785 { 786 shared_ptr(__p, __d).swap(*this); 787 } 788 789 template<class _Yp, class _Dp, class _Alloc, class = __enable_if_t< 790 __compatible_with<_Yp, _Tp>::value 791 > > 792 _LIBCPP_HIDE_FROM_ABI 793 void reset(_Yp* __p, _Dp __d, _Alloc __a) 794 { 795 shared_ptr(__p, __d, __a).swap(*this); 796 } 797 798 _LIBCPP_HIDE_FROM_ABI 799 element_type* get() const _NOEXCEPT 800 { 801 return __ptr_; 802 } 803 804 _LIBCPP_HIDE_FROM_ABI 805 typename add_lvalue_reference<element_type>::type operator*() const _NOEXCEPT 806 { 807 return *__ptr_; 808 } 809 810 _LIBCPP_HIDE_FROM_ABI 811 element_type* operator->() const _NOEXCEPT 812 { 813 static_assert(!is_array<_Tp>::value, 814 "std::shared_ptr<T>::operator-> is only valid when T is not an array type."); 815 return __ptr_; 816 } 817 818 _LIBCPP_HIDE_FROM_ABI 819 long use_count() const _NOEXCEPT 820 { 821 return __cntrl_ ? __cntrl_->use_count() : 0; 822 } 823 824 _LIBCPP_HIDE_FROM_ABI 825 bool unique() const _NOEXCEPT 826 { 827 return use_count() == 1; 828 } 829 830 _LIBCPP_HIDE_FROM_ABI 831 explicit operator bool() const _NOEXCEPT 832 { 833 return get() != nullptr; 834 } 835 836 template <class _Up> 837 _LIBCPP_HIDE_FROM_ABI 838 bool owner_before(shared_ptr<_Up> const& __p) const _NOEXCEPT 839 { 840 return __cntrl_ < __p.__cntrl_; 841 } 842 843 template <class _Up> 844 _LIBCPP_HIDE_FROM_ABI 845 bool owner_before(weak_ptr<_Up> const& __p) const _NOEXCEPT 846 { 847 return __cntrl_ < __p.__cntrl_; 848 } 849 850 _LIBCPP_HIDE_FROM_ABI 851 bool __owner_equivalent(const shared_ptr& __p) const 852 { 853 return __cntrl_ == __p.__cntrl_; 854 } 855 856 #if _LIBCPP_STD_VER > 14 857 _LIBCPP_HIDE_FROM_ABI 858 typename add_lvalue_reference<element_type>::type operator[](ptrdiff_t __i) const 859 { 860 static_assert(is_array<_Tp>::value, 861 "std::shared_ptr<T>::operator[] is only valid when T is an array type."); 862 return __ptr_[__i]; 863 } 864 #endif 865 866 #ifndef _LIBCPP_NO_RTTI 867 template <class _Dp> 868 _LIBCPP_HIDE_FROM_ABI 869 _Dp* __get_deleter() const _NOEXCEPT 870 { 871 return static_cast<_Dp*>(__cntrl_ 872 ? const_cast<void *>(__cntrl_->__get_deleter(typeid(_Dp))) 873 : nullptr); 874 } 875 #endif // _LIBCPP_NO_RTTI 876 877 template<class _Yp, class _CntrlBlk> 878 _LIBCPP_HIDE_FROM_ABI 879 static shared_ptr<_Tp> __create_with_control_block(_Yp* __p, _CntrlBlk* __cntrl) _NOEXCEPT 880 { 881 shared_ptr<_Tp> __r; 882 __r.__ptr_ = __p; 883 __r.__cntrl_ = __cntrl; 884 __r.__enable_weak_this(__r.__ptr_, __r.__ptr_); 885 return __r; 886 } 887 888 private: 889 template <class _Yp, bool = is_function<_Yp>::value> 890 struct __shared_ptr_default_allocator 891 { 892 typedef allocator<_Yp> type; 893 }; 894 895 template <class _Yp> 896 struct __shared_ptr_default_allocator<_Yp, true> 897 { 898 typedef allocator<__shared_ptr_dummy_rebind_allocator_type> type; 899 }; 900 901 template <class _Yp, class _OrigPtr, class = __enable_if_t< 902 is_convertible<_OrigPtr*, const enable_shared_from_this<_Yp>*>::value 903 > > 904 _LIBCPP_HIDE_FROM_ABI 905 void __enable_weak_this(const enable_shared_from_this<_Yp>* __e, _OrigPtr* __ptr) _NOEXCEPT 906 { 907 typedef typename remove_cv<_Yp>::type _RawYp; 908 if (__e && __e->__weak_this_.expired()) 909 { 910 __e->__weak_this_ = shared_ptr<_RawYp>(*this, 911 const_cast<_RawYp*>(static_cast<const _Yp*>(__ptr))); 912 } 913 } 914 915 _LIBCPP_HIDE_FROM_ABI void __enable_weak_this(...) _NOEXCEPT { } 916 917 template <class, class _Yp> 918 struct __shared_ptr_default_delete 919 : default_delete<_Yp> 920 { }; 921 922 template <class _Yp, class _Un, size_t _Sz> 923 struct __shared_ptr_default_delete<_Yp[_Sz], _Un> 924 : default_delete<_Yp[]> 925 { }; 926 927 template <class _Yp, class _Un> 928 struct __shared_ptr_default_delete<_Yp[], _Un> 929 : default_delete<_Yp[]> 930 { }; 931 932 template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr; 933 template <class _Up> friend class _LIBCPP_TEMPLATE_VIS weak_ptr; 934 }; 935 936 #if _LIBCPP_STD_VER > 14 937 template<class _Tp> 938 shared_ptr(weak_ptr<_Tp>) -> shared_ptr<_Tp>; 939 template<class _Tp, class _Dp> 940 shared_ptr(unique_ptr<_Tp, _Dp>) -> shared_ptr<_Tp>; 941 #endif 942 943 // 944 // std::allocate_shared and std::make_shared 945 // 946 template<class _Tp, class _Alloc, class ..._Args, class = __enable_if_t<!is_array<_Tp>::value> > 947 _LIBCPP_HIDE_FROM_ABI 948 shared_ptr<_Tp> allocate_shared(const _Alloc& __a, _Args&& ...__args) 949 { 950 using _ControlBlock = __shared_ptr_emplace<_Tp, _Alloc>; 951 using _ControlBlockAllocator = typename __allocator_traits_rebind<_Alloc, _ControlBlock>::type; 952 __allocation_guard<_ControlBlockAllocator> __guard(__a, 1); 953 ::new ((void*)_VSTD::addressof(*__guard.__get())) _ControlBlock(__a, _VSTD::forward<_Args>(__args)...); 954 auto __control_block = __guard.__release_ptr(); 955 return shared_ptr<_Tp>::__create_with_control_block((*__control_block).__get_elem(), _VSTD::addressof(*__control_block)); 956 } 957 958 template<class _Tp, class ..._Args, class = __enable_if_t<!is_array<_Tp>::value> > 959 _LIBCPP_HIDE_FROM_ABI 960 shared_ptr<_Tp> make_shared(_Args&& ...__args) 961 { 962 return _VSTD::allocate_shared<_Tp>(allocator<_Tp>(), _VSTD::forward<_Args>(__args)...); 963 } 964 965 #if _LIBCPP_STD_VER > 14 966 967 template <size_t _Alignment> 968 struct __sp_aligned_storage { 969 alignas(_Alignment) char __storage[_Alignment]; 970 }; 971 972 template <class _Tp, class _Alloc> 973 struct __unbounded_array_control_block; 974 975 template <class _Tp, class _Alloc> 976 struct __unbounded_array_control_block<_Tp[], _Alloc> : __shared_weak_count 977 { 978 _LIBCPP_HIDE_FROM_ABI constexpr 979 _Tp* __get_data() noexcept { return __data_; } 980 981 _LIBCPP_HIDE_FROM_ABI 982 explicit __unbounded_array_control_block(_Alloc const& __alloc, size_t __count, _Tp const& __arg) 983 : __alloc_(__alloc), __count_(__count) 984 { 985 std::__uninitialized_allocator_fill_n(__alloc_, std::begin(__data_), __count_, __arg); 986 } 987 988 _LIBCPP_HIDE_FROM_ABI 989 explicit __unbounded_array_control_block(_Alloc const& __alloc, size_t __count) 990 : __alloc_(__alloc), __count_(__count) 991 { 992 std::__uninitialized_allocator_value_construct_n(__alloc_, std::begin(__data_), __count_); 993 } 994 995 // Returns the number of bytes required to store a control block followed by the given number 996 // of elements of _Tp, with the whole storage being aligned to a multiple of _Tp's alignment. 997 _LIBCPP_HIDE_FROM_ABI 998 static constexpr size_t __bytes_for(size_t __elements) { 999 // When there's 0 elements, the control block alone is enough since it holds one element. 1000 // Otherwise, we allocate one fewer element than requested because the control block already 1001 // holds one. Also, we use the bitwise formula below to ensure that we allocate enough bytes 1002 // for the whole allocation to be a multiple of _Tp's alignment. That formula is taken from [1]. 1003 // 1004 // [1]: https://en.wikipedia.org/wiki/Data_structure_alignment#Computing_padding 1005 size_t __bytes = __elements == 0 ? sizeof(__unbounded_array_control_block) 1006 : (__elements - 1) * sizeof(_Tp) + sizeof(__unbounded_array_control_block); 1007 constexpr size_t __align = alignof(_Tp); 1008 return (__bytes + __align - 1) & ~(__align - 1); 1009 } 1010 1011 _LIBCPP_HIDE_FROM_ABI 1012 ~__unbounded_array_control_block() override { } // can't be `= default` because of the sometimes-non-trivial union member __data_ 1013 1014 private: 1015 void __on_zero_shared() _NOEXCEPT override { 1016 __allocator_traits_rebind_t<_Alloc, _Tp> __value_alloc(__alloc_); 1017 std::__allocator_destroy_multidimensional(__value_alloc, __data_, __data_ + __count_); 1018 } 1019 1020 void __on_zero_shared_weak() _NOEXCEPT override { 1021 using _AlignedStorage = __sp_aligned_storage<alignof(__unbounded_array_control_block)>; 1022 using _StorageAlloc = __allocator_traits_rebind_t<_Alloc, _AlignedStorage>; 1023 using _PointerTraits = pointer_traits<typename allocator_traits<_StorageAlloc>::pointer>; 1024 1025 _StorageAlloc __tmp(__alloc_); 1026 __alloc_.~_Alloc(); 1027 size_t __size = __unbounded_array_control_block::__bytes_for(__count_); 1028 _AlignedStorage* __storage = reinterpret_cast<_AlignedStorage*>(this); 1029 allocator_traits<_StorageAlloc>::deallocate(__tmp, _PointerTraits::pointer_to(*__storage), __size); 1030 } 1031 1032 _LIBCPP_NO_UNIQUE_ADDRESS _Alloc __alloc_; 1033 size_t __count_; 1034 union { 1035 _Tp __data_[1]; 1036 }; 1037 }; 1038 1039 template<class _Array, class _Alloc, class... _Arg> 1040 _LIBCPP_HIDE_FROM_ABI 1041 shared_ptr<_Array> __allocate_shared_unbounded_array(const _Alloc& __a, size_t __n, _Arg&& ...__arg) 1042 { 1043 static_assert(__libcpp_is_unbounded_array<_Array>::value); 1044 // We compute the number of bytes necessary to hold the control block and the 1045 // array elements. Then, we allocate an array of properly-aligned dummy structs 1046 // large enough to hold the control block and array. This allows shifting the 1047 // burden of aligning memory properly from us to the allocator. 1048 using _ControlBlock = __unbounded_array_control_block<_Array, _Alloc>; 1049 using _AlignedStorage = __sp_aligned_storage<alignof(_ControlBlock)>; 1050 using _StorageAlloc = __allocator_traits_rebind_t<_Alloc, _AlignedStorage>; 1051 __allocation_guard<_StorageAlloc> __guard(__a, _ControlBlock::__bytes_for(__n) / sizeof(_AlignedStorage)); 1052 _ControlBlock* __control_block = reinterpret_cast<_ControlBlock*>(std::addressof(*__guard.__get())); 1053 std::__construct_at(__control_block, __a, __n, std::forward<_Arg>(__arg)...); 1054 __guard.__release_ptr(); 1055 return shared_ptr<_Array>::__create_with_control_block(__control_block->__get_data(), __control_block); 1056 } 1057 1058 template <class _Tp, class _Alloc> 1059 struct __bounded_array_control_block; 1060 1061 template <class _Tp, size_t _Count, class _Alloc> 1062 struct __bounded_array_control_block<_Tp[_Count], _Alloc> 1063 : __shared_weak_count 1064 { 1065 _LIBCPP_HIDE_FROM_ABI constexpr 1066 _Tp* __get_data() noexcept { return __data_; } 1067 1068 _LIBCPP_HIDE_FROM_ABI 1069 explicit __bounded_array_control_block(_Alloc const& __alloc, _Tp const& __arg) : __alloc_(__alloc) { 1070 std::__uninitialized_allocator_fill_n(__alloc_, std::addressof(__data_[0]), _Count, __arg); 1071 } 1072 1073 _LIBCPP_HIDE_FROM_ABI 1074 explicit __bounded_array_control_block(_Alloc const& __alloc) : __alloc_(__alloc) { 1075 std::__uninitialized_allocator_value_construct_n(__alloc_, std::addressof(__data_[0]), _Count); 1076 } 1077 1078 _LIBCPP_HIDE_FROM_ABI 1079 ~__bounded_array_control_block() override { } // can't be `= default` because of the sometimes-non-trivial union member __data_ 1080 1081 private: 1082 void __on_zero_shared() _NOEXCEPT override { 1083 __allocator_traits_rebind_t<_Alloc, _Tp> __value_alloc(__alloc_); 1084 std::__allocator_destroy_multidimensional(__value_alloc, __data_, __data_ + _Count); 1085 } 1086 1087 void __on_zero_shared_weak() _NOEXCEPT override { 1088 using _ControlBlockAlloc = __allocator_traits_rebind_t<_Alloc, __bounded_array_control_block>; 1089 using _PointerTraits = pointer_traits<typename allocator_traits<_ControlBlockAlloc>::pointer>; 1090 1091 _ControlBlockAlloc __tmp(__alloc_); 1092 __alloc_.~_Alloc(); 1093 allocator_traits<_ControlBlockAlloc>::deallocate(__tmp, _PointerTraits::pointer_to(*this), sizeof(*this)); 1094 } 1095 1096 _LIBCPP_NO_UNIQUE_ADDRESS _Alloc __alloc_; 1097 union { 1098 _Tp __data_[_Count]; 1099 }; 1100 }; 1101 1102 template<class _Array, class _Alloc, class... _Arg> 1103 _LIBCPP_HIDE_FROM_ABI 1104 shared_ptr<_Array> __allocate_shared_bounded_array(const _Alloc& __a, _Arg&& ...__arg) 1105 { 1106 static_assert(__libcpp_is_bounded_array<_Array>::value); 1107 using _ControlBlock = __bounded_array_control_block<_Array, _Alloc>; 1108 using _ControlBlockAlloc = __allocator_traits_rebind_t<_Alloc, _ControlBlock>; 1109 1110 __allocation_guard<_ControlBlockAlloc> __guard(__a, 1); 1111 _ControlBlock* __control_block = reinterpret_cast<_ControlBlock*>(std::addressof(*__guard.__get())); 1112 std::__construct_at(__control_block, __a, std::forward<_Arg>(__arg)...); 1113 __guard.__release_ptr(); 1114 return shared_ptr<_Array>::__create_with_control_block(__control_block->__get_data(), __control_block); 1115 } 1116 1117 #endif // _LIBCPP_STD_VER > 14 1118 1119 #if _LIBCPP_STD_VER > 17 1120 1121 template<class _Tp, class _Alloc, class = __enable_if_t<is_bounded_array<_Tp>::value>> 1122 _LIBCPP_HIDE_FROM_ABI 1123 shared_ptr<_Tp> allocate_shared(const _Alloc& __a) 1124 { 1125 return std::__allocate_shared_bounded_array<_Tp>(__a); 1126 } 1127 1128 template<class _Tp, class _Alloc, class = __enable_if_t<is_bounded_array<_Tp>::value>> 1129 _LIBCPP_HIDE_FROM_ABI 1130 shared_ptr<_Tp> allocate_shared(const _Alloc& __a, const remove_extent_t<_Tp>& __u) 1131 { 1132 return std::__allocate_shared_bounded_array<_Tp>(__a, __u); 1133 } 1134 1135 template<class _Tp, class _Alloc, class = __enable_if_t<is_unbounded_array<_Tp>::value>> 1136 _LIBCPP_HIDE_FROM_ABI 1137 shared_ptr<_Tp> allocate_shared(const _Alloc& __a, size_t __n) 1138 { 1139 return std::__allocate_shared_unbounded_array<_Tp>(__a, __n); 1140 } 1141 1142 template<class _Tp, class _Alloc, class = __enable_if_t<is_unbounded_array<_Tp>::value>> 1143 _LIBCPP_HIDE_FROM_ABI 1144 shared_ptr<_Tp> allocate_shared(const _Alloc& __a, size_t __n, const remove_extent_t<_Tp>& __u) 1145 { 1146 return std::__allocate_shared_unbounded_array<_Tp>(__a, __n, __u); 1147 } 1148 1149 template<class _Tp, class = __enable_if_t<is_bounded_array<_Tp>::value>> 1150 _LIBCPP_HIDE_FROM_ABI 1151 shared_ptr<_Tp> make_shared() 1152 { 1153 return std::__allocate_shared_bounded_array<_Tp>(allocator<_Tp>()); 1154 } 1155 1156 template<class _Tp, class = __enable_if_t<is_bounded_array<_Tp>::value>> 1157 _LIBCPP_HIDE_FROM_ABI 1158 shared_ptr<_Tp> make_shared(const remove_extent_t<_Tp>& __u) 1159 { 1160 return std::__allocate_shared_bounded_array<_Tp>(allocator<_Tp>(), __u); 1161 } 1162 1163 template<class _Tp, class = __enable_if_t<is_unbounded_array<_Tp>::value>> 1164 _LIBCPP_HIDE_FROM_ABI 1165 shared_ptr<_Tp> make_shared(size_t __n) 1166 { 1167 return std::__allocate_shared_unbounded_array<_Tp>(allocator<_Tp>(), __n); 1168 } 1169 1170 template<class _Tp, class = __enable_if_t<is_unbounded_array<_Tp>::value>> 1171 _LIBCPP_HIDE_FROM_ABI 1172 shared_ptr<_Tp> make_shared(size_t __n, const remove_extent_t<_Tp>& __u) 1173 { 1174 return std::__allocate_shared_unbounded_array<_Tp>(allocator<_Tp>(), __n, __u); 1175 } 1176 1177 #endif // _LIBCPP_STD_VER > 17 1178 1179 template<class _Tp, class _Up> 1180 inline _LIBCPP_INLINE_VISIBILITY 1181 bool 1182 operator==(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT 1183 { 1184 return __x.get() == __y.get(); 1185 } 1186 1187 template<class _Tp, class _Up> 1188 inline _LIBCPP_INLINE_VISIBILITY 1189 bool 1190 operator!=(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT 1191 { 1192 return !(__x == __y); 1193 } 1194 1195 template<class _Tp, class _Up> 1196 inline _LIBCPP_INLINE_VISIBILITY 1197 bool 1198 operator<(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT 1199 { 1200 #if _LIBCPP_STD_VER <= 11 1201 typedef typename common_type<_Tp*, _Up*>::type _Vp; 1202 return less<_Vp>()(__x.get(), __y.get()); 1203 #else 1204 return less<>()(__x.get(), __y.get()); 1205 #endif 1206 1207 } 1208 1209 template<class _Tp, class _Up> 1210 inline _LIBCPP_INLINE_VISIBILITY 1211 bool 1212 operator>(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT 1213 { 1214 return __y < __x; 1215 } 1216 1217 template<class _Tp, class _Up> 1218 inline _LIBCPP_INLINE_VISIBILITY 1219 bool 1220 operator<=(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT 1221 { 1222 return !(__y < __x); 1223 } 1224 1225 template<class _Tp, class _Up> 1226 inline _LIBCPP_INLINE_VISIBILITY 1227 bool 1228 operator>=(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT 1229 { 1230 return !(__x < __y); 1231 } 1232 1233 template<class _Tp> 1234 inline _LIBCPP_INLINE_VISIBILITY 1235 bool 1236 operator==(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT 1237 { 1238 return !__x; 1239 } 1240 1241 template<class _Tp> 1242 inline _LIBCPP_INLINE_VISIBILITY 1243 bool 1244 operator==(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT 1245 { 1246 return !__x; 1247 } 1248 1249 template<class _Tp> 1250 inline _LIBCPP_INLINE_VISIBILITY 1251 bool 1252 operator!=(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT 1253 { 1254 return static_cast<bool>(__x); 1255 } 1256 1257 template<class _Tp> 1258 inline _LIBCPP_INLINE_VISIBILITY 1259 bool 1260 operator!=(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT 1261 { 1262 return static_cast<bool>(__x); 1263 } 1264 1265 template<class _Tp> 1266 inline _LIBCPP_INLINE_VISIBILITY 1267 bool 1268 operator<(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT 1269 { 1270 return less<_Tp*>()(__x.get(), nullptr); 1271 } 1272 1273 template<class _Tp> 1274 inline _LIBCPP_INLINE_VISIBILITY 1275 bool 1276 operator<(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT 1277 { 1278 return less<_Tp*>()(nullptr, __x.get()); 1279 } 1280 1281 template<class _Tp> 1282 inline _LIBCPP_INLINE_VISIBILITY 1283 bool 1284 operator>(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT 1285 { 1286 return nullptr < __x; 1287 } 1288 1289 template<class _Tp> 1290 inline _LIBCPP_INLINE_VISIBILITY 1291 bool 1292 operator>(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT 1293 { 1294 return __x < nullptr; 1295 } 1296 1297 template<class _Tp> 1298 inline _LIBCPP_INLINE_VISIBILITY 1299 bool 1300 operator<=(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT 1301 { 1302 return !(nullptr < __x); 1303 } 1304 1305 template<class _Tp> 1306 inline _LIBCPP_INLINE_VISIBILITY 1307 bool 1308 operator<=(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT 1309 { 1310 return !(__x < nullptr); 1311 } 1312 1313 template<class _Tp> 1314 inline _LIBCPP_INLINE_VISIBILITY 1315 bool 1316 operator>=(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT 1317 { 1318 return !(__x < nullptr); 1319 } 1320 1321 template<class _Tp> 1322 inline _LIBCPP_INLINE_VISIBILITY 1323 bool 1324 operator>=(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT 1325 { 1326 return !(nullptr < __x); 1327 } 1328 1329 template<class _Tp> 1330 inline _LIBCPP_INLINE_VISIBILITY 1331 void 1332 swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT 1333 { 1334 __x.swap(__y); 1335 } 1336 1337 template<class _Tp, class _Up> 1338 inline _LIBCPP_INLINE_VISIBILITY 1339 shared_ptr<_Tp> 1340 static_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT 1341 { 1342 return shared_ptr<_Tp>(__r, 1343 static_cast< 1344 typename shared_ptr<_Tp>::element_type*>(__r.get())); 1345 } 1346 1347 template<class _Tp, class _Up> 1348 inline _LIBCPP_INLINE_VISIBILITY 1349 shared_ptr<_Tp> 1350 dynamic_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT 1351 { 1352 typedef typename shared_ptr<_Tp>::element_type _ET; 1353 _ET* __p = dynamic_cast<_ET*>(__r.get()); 1354 return __p ? shared_ptr<_Tp>(__r, __p) : shared_ptr<_Tp>(); 1355 } 1356 1357 template<class _Tp, class _Up> 1358 shared_ptr<_Tp> 1359 const_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT 1360 { 1361 typedef typename shared_ptr<_Tp>::element_type _RTp; 1362 return shared_ptr<_Tp>(__r, const_cast<_RTp*>(__r.get())); 1363 } 1364 1365 template<class _Tp, class _Up> 1366 shared_ptr<_Tp> 1367 reinterpret_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT 1368 { 1369 return shared_ptr<_Tp>(__r, 1370 reinterpret_cast< 1371 typename shared_ptr<_Tp>::element_type*>(__r.get())); 1372 } 1373 1374 #ifndef _LIBCPP_NO_RTTI 1375 1376 template<class _Dp, class _Tp> 1377 inline _LIBCPP_INLINE_VISIBILITY 1378 _Dp* 1379 get_deleter(const shared_ptr<_Tp>& __p) _NOEXCEPT 1380 { 1381 return __p.template __get_deleter<_Dp>(); 1382 } 1383 1384 #endif // _LIBCPP_NO_RTTI 1385 1386 template<class _Tp> 1387 class _LIBCPP_SHARED_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS weak_ptr 1388 { 1389 public: 1390 #if _LIBCPP_STD_VER > 14 1391 typedef remove_extent_t<_Tp> element_type; 1392 #else 1393 typedef _Tp element_type; 1394 #endif 1395 1396 private: 1397 element_type* __ptr_; 1398 __shared_weak_count* __cntrl_; 1399 1400 public: 1401 _LIBCPP_INLINE_VISIBILITY 1402 _LIBCPP_CONSTEXPR weak_ptr() _NOEXCEPT; 1403 template<class _Yp> _LIBCPP_INLINE_VISIBILITY weak_ptr(shared_ptr<_Yp> const& __r, 1404 typename enable_if<__compatible_with<_Yp, _Tp>::value, __nat*>::type = 0) 1405 _NOEXCEPT; 1406 _LIBCPP_INLINE_VISIBILITY 1407 weak_ptr(weak_ptr const& __r) _NOEXCEPT; 1408 template<class _Yp> _LIBCPP_INLINE_VISIBILITY weak_ptr(weak_ptr<_Yp> const& __r, 1409 typename enable_if<__compatible_with<_Yp, _Tp>::value, __nat*>::type = 0) 1410 _NOEXCEPT; 1411 1412 _LIBCPP_INLINE_VISIBILITY 1413 weak_ptr(weak_ptr&& __r) _NOEXCEPT; 1414 template<class _Yp> _LIBCPP_INLINE_VISIBILITY weak_ptr(weak_ptr<_Yp>&& __r, 1415 typename enable_if<__compatible_with<_Yp, _Tp>::value, __nat*>::type = 0) 1416 _NOEXCEPT; 1417 ~weak_ptr(); 1418 1419 _LIBCPP_INLINE_VISIBILITY 1420 weak_ptr& operator=(weak_ptr const& __r) _NOEXCEPT; 1421 template<class _Yp> 1422 typename enable_if 1423 < 1424 __compatible_with<_Yp, _Tp>::value, 1425 weak_ptr& 1426 >::type 1427 _LIBCPP_INLINE_VISIBILITY 1428 operator=(weak_ptr<_Yp> const& __r) _NOEXCEPT; 1429 1430 _LIBCPP_INLINE_VISIBILITY 1431 weak_ptr& operator=(weak_ptr&& __r) _NOEXCEPT; 1432 template<class _Yp> 1433 typename enable_if 1434 < 1435 __compatible_with<_Yp, _Tp>::value, 1436 weak_ptr& 1437 >::type 1438 _LIBCPP_INLINE_VISIBILITY 1439 operator=(weak_ptr<_Yp>&& __r) _NOEXCEPT; 1440 1441 template<class _Yp> 1442 typename enable_if 1443 < 1444 __compatible_with<_Yp, _Tp>::value, 1445 weak_ptr& 1446 >::type 1447 _LIBCPP_INLINE_VISIBILITY 1448 operator=(shared_ptr<_Yp> const& __r) _NOEXCEPT; 1449 1450 _LIBCPP_INLINE_VISIBILITY 1451 void swap(weak_ptr& __r) _NOEXCEPT; 1452 _LIBCPP_INLINE_VISIBILITY 1453 void reset() _NOEXCEPT; 1454 1455 _LIBCPP_INLINE_VISIBILITY 1456 long use_count() const _NOEXCEPT 1457 {return __cntrl_ ? __cntrl_->use_count() : 0;} 1458 _LIBCPP_INLINE_VISIBILITY 1459 bool expired() const _NOEXCEPT 1460 {return __cntrl_ == nullptr || __cntrl_->use_count() == 0;} 1461 shared_ptr<_Tp> lock() const _NOEXCEPT; 1462 template<class _Up> 1463 _LIBCPP_INLINE_VISIBILITY 1464 bool owner_before(const shared_ptr<_Up>& __r) const _NOEXCEPT 1465 {return __cntrl_ < __r.__cntrl_;} 1466 template<class _Up> 1467 _LIBCPP_INLINE_VISIBILITY 1468 bool owner_before(const weak_ptr<_Up>& __r) const _NOEXCEPT 1469 {return __cntrl_ < __r.__cntrl_;} 1470 1471 template <class _Up> friend class _LIBCPP_TEMPLATE_VIS weak_ptr; 1472 template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr; 1473 }; 1474 1475 #if _LIBCPP_STD_VER > 14 1476 template<class _Tp> 1477 weak_ptr(shared_ptr<_Tp>) -> weak_ptr<_Tp>; 1478 #endif 1479 1480 template<class _Tp> 1481 inline 1482 _LIBCPP_CONSTEXPR 1483 weak_ptr<_Tp>::weak_ptr() _NOEXCEPT 1484 : __ptr_(nullptr), 1485 __cntrl_(nullptr) 1486 { 1487 } 1488 1489 template<class _Tp> 1490 inline 1491 weak_ptr<_Tp>::weak_ptr(weak_ptr const& __r) _NOEXCEPT 1492 : __ptr_(__r.__ptr_), 1493 __cntrl_(__r.__cntrl_) 1494 { 1495 if (__cntrl_) 1496 __cntrl_->__add_weak(); 1497 } 1498 1499 template<class _Tp> 1500 template<class _Yp> 1501 inline 1502 weak_ptr<_Tp>::weak_ptr(shared_ptr<_Yp> const& __r, 1503 typename enable_if<__compatible_with<_Yp, _Tp>::value, __nat*>::type) 1504 _NOEXCEPT 1505 : __ptr_(__r.__ptr_), 1506 __cntrl_(__r.__cntrl_) 1507 { 1508 if (__cntrl_) 1509 __cntrl_->__add_weak(); 1510 } 1511 1512 template<class _Tp> 1513 template<class _Yp> 1514 inline 1515 weak_ptr<_Tp>::weak_ptr(weak_ptr<_Yp> const& __r, 1516 typename enable_if<__compatible_with<_Yp, _Tp>::value, __nat*>::type) 1517 _NOEXCEPT 1518 : __ptr_(__r.__ptr_), 1519 __cntrl_(__r.__cntrl_) 1520 { 1521 if (__cntrl_) 1522 __cntrl_->__add_weak(); 1523 } 1524 1525 template<class _Tp> 1526 inline 1527 weak_ptr<_Tp>::weak_ptr(weak_ptr&& __r) _NOEXCEPT 1528 : __ptr_(__r.__ptr_), 1529 __cntrl_(__r.__cntrl_) 1530 { 1531 __r.__ptr_ = nullptr; 1532 __r.__cntrl_ = nullptr; 1533 } 1534 1535 template<class _Tp> 1536 template<class _Yp> 1537 inline 1538 weak_ptr<_Tp>::weak_ptr(weak_ptr<_Yp>&& __r, 1539 typename enable_if<__compatible_with<_Yp, _Tp>::value, __nat*>::type) 1540 _NOEXCEPT 1541 : __ptr_(__r.__ptr_), 1542 __cntrl_(__r.__cntrl_) 1543 { 1544 __r.__ptr_ = nullptr; 1545 __r.__cntrl_ = nullptr; 1546 } 1547 1548 template<class _Tp> 1549 weak_ptr<_Tp>::~weak_ptr() 1550 { 1551 if (__cntrl_) 1552 __cntrl_->__release_weak(); 1553 } 1554 1555 template<class _Tp> 1556 inline 1557 weak_ptr<_Tp>& 1558 weak_ptr<_Tp>::operator=(weak_ptr const& __r) _NOEXCEPT 1559 { 1560 weak_ptr(__r).swap(*this); 1561 return *this; 1562 } 1563 1564 template<class _Tp> 1565 template<class _Yp> 1566 inline 1567 typename enable_if 1568 < 1569 __compatible_with<_Yp, _Tp>::value, 1570 weak_ptr<_Tp>& 1571 >::type 1572 weak_ptr<_Tp>::operator=(weak_ptr<_Yp> const& __r) _NOEXCEPT 1573 { 1574 weak_ptr(__r).swap(*this); 1575 return *this; 1576 } 1577 1578 template<class _Tp> 1579 inline 1580 weak_ptr<_Tp>& 1581 weak_ptr<_Tp>::operator=(weak_ptr&& __r) _NOEXCEPT 1582 { 1583 weak_ptr(_VSTD::move(__r)).swap(*this); 1584 return *this; 1585 } 1586 1587 template<class _Tp> 1588 template<class _Yp> 1589 inline 1590 typename enable_if 1591 < 1592 __compatible_with<_Yp, _Tp>::value, 1593 weak_ptr<_Tp>& 1594 >::type 1595 weak_ptr<_Tp>::operator=(weak_ptr<_Yp>&& __r) _NOEXCEPT 1596 { 1597 weak_ptr(_VSTD::move(__r)).swap(*this); 1598 return *this; 1599 } 1600 1601 template<class _Tp> 1602 template<class _Yp> 1603 inline 1604 typename enable_if 1605 < 1606 __compatible_with<_Yp, _Tp>::value, 1607 weak_ptr<_Tp>& 1608 >::type 1609 weak_ptr<_Tp>::operator=(shared_ptr<_Yp> const& __r) _NOEXCEPT 1610 { 1611 weak_ptr(__r).swap(*this); 1612 return *this; 1613 } 1614 1615 template<class _Tp> 1616 inline 1617 void 1618 weak_ptr<_Tp>::swap(weak_ptr& __r) _NOEXCEPT 1619 { 1620 _VSTD::swap(__ptr_, __r.__ptr_); 1621 _VSTD::swap(__cntrl_, __r.__cntrl_); 1622 } 1623 1624 template<class _Tp> 1625 inline _LIBCPP_INLINE_VISIBILITY 1626 void 1627 swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT 1628 { 1629 __x.swap(__y); 1630 } 1631 1632 template<class _Tp> 1633 inline 1634 void 1635 weak_ptr<_Tp>::reset() _NOEXCEPT 1636 { 1637 weak_ptr().swap(*this); 1638 } 1639 1640 template<class _Tp> 1641 shared_ptr<_Tp> 1642 weak_ptr<_Tp>::lock() const _NOEXCEPT 1643 { 1644 shared_ptr<_Tp> __r; 1645 __r.__cntrl_ = __cntrl_ ? __cntrl_->lock() : __cntrl_; 1646 if (__r.__cntrl_) 1647 __r.__ptr_ = __ptr_; 1648 return __r; 1649 } 1650 1651 #if _LIBCPP_STD_VER > 14 1652 template <class _Tp = void> struct owner_less; 1653 #else 1654 template <class _Tp> struct owner_less; 1655 #endif 1656 1657 1658 template <class _Tp> 1659 struct _LIBCPP_TEMPLATE_VIS owner_less<shared_ptr<_Tp> > 1660 : __binary_function<shared_ptr<_Tp>, shared_ptr<_Tp>, bool> 1661 { 1662 _LIBCPP_INLINE_VISIBILITY 1663 bool operator()(shared_ptr<_Tp> const& __x, shared_ptr<_Tp> const& __y) const _NOEXCEPT 1664 {return __x.owner_before(__y);} 1665 _LIBCPP_INLINE_VISIBILITY 1666 bool operator()(shared_ptr<_Tp> const& __x, weak_ptr<_Tp> const& __y) const _NOEXCEPT 1667 {return __x.owner_before(__y);} 1668 _LIBCPP_INLINE_VISIBILITY 1669 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Tp> const& __y) const _NOEXCEPT 1670 {return __x.owner_before(__y);} 1671 }; 1672 1673 template <class _Tp> 1674 struct _LIBCPP_TEMPLATE_VIS owner_less<weak_ptr<_Tp> > 1675 : __binary_function<weak_ptr<_Tp>, weak_ptr<_Tp>, bool> 1676 { 1677 _LIBCPP_INLINE_VISIBILITY 1678 bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Tp> const& __y) const _NOEXCEPT 1679 {return __x.owner_before(__y);} 1680 _LIBCPP_INLINE_VISIBILITY 1681 bool operator()(shared_ptr<_Tp> const& __x, weak_ptr<_Tp> const& __y) const _NOEXCEPT 1682 {return __x.owner_before(__y);} 1683 _LIBCPP_INLINE_VISIBILITY 1684 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Tp> const& __y) const _NOEXCEPT 1685 {return __x.owner_before(__y);} 1686 }; 1687 1688 #if _LIBCPP_STD_VER > 14 1689 template <> 1690 struct _LIBCPP_TEMPLATE_VIS owner_less<void> 1691 { 1692 template <class _Tp, class _Up> 1693 _LIBCPP_INLINE_VISIBILITY 1694 bool operator()( shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const _NOEXCEPT 1695 {return __x.owner_before(__y);} 1696 template <class _Tp, class _Up> 1697 _LIBCPP_INLINE_VISIBILITY 1698 bool operator()( shared_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const _NOEXCEPT 1699 {return __x.owner_before(__y);} 1700 template <class _Tp, class _Up> 1701 _LIBCPP_INLINE_VISIBILITY 1702 bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const _NOEXCEPT 1703 {return __x.owner_before(__y);} 1704 template <class _Tp, class _Up> 1705 _LIBCPP_INLINE_VISIBILITY 1706 bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const _NOEXCEPT 1707 {return __x.owner_before(__y);} 1708 typedef void is_transparent; 1709 }; 1710 #endif 1711 1712 template<class _Tp> 1713 class _LIBCPP_TEMPLATE_VIS enable_shared_from_this 1714 { 1715 mutable weak_ptr<_Tp> __weak_this_; 1716 protected: 1717 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1718 enable_shared_from_this() _NOEXCEPT {} 1719 _LIBCPP_INLINE_VISIBILITY 1720 enable_shared_from_this(enable_shared_from_this const&) _NOEXCEPT {} 1721 _LIBCPP_INLINE_VISIBILITY 1722 enable_shared_from_this& operator=(enable_shared_from_this const&) _NOEXCEPT 1723 {return *this;} 1724 _LIBCPP_INLINE_VISIBILITY 1725 ~enable_shared_from_this() {} 1726 public: 1727 _LIBCPP_INLINE_VISIBILITY 1728 shared_ptr<_Tp> shared_from_this() 1729 {return shared_ptr<_Tp>(__weak_this_);} 1730 _LIBCPP_INLINE_VISIBILITY 1731 shared_ptr<_Tp const> shared_from_this() const 1732 {return shared_ptr<const _Tp>(__weak_this_);} 1733 1734 #if _LIBCPP_STD_VER > 14 1735 _LIBCPP_INLINE_VISIBILITY 1736 weak_ptr<_Tp> weak_from_this() _NOEXCEPT 1737 { return __weak_this_; } 1738 1739 _LIBCPP_INLINE_VISIBILITY 1740 weak_ptr<const _Tp> weak_from_this() const _NOEXCEPT 1741 { return __weak_this_; } 1742 #endif // _LIBCPP_STD_VER > 14 1743 1744 template <class _Up> friend class shared_ptr; 1745 }; 1746 1747 template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 1748 1749 template <class _Tp> 1750 struct _LIBCPP_TEMPLATE_VIS hash<shared_ptr<_Tp> > 1751 { 1752 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) 1753 _LIBCPP_DEPRECATED_IN_CXX17 typedef shared_ptr<_Tp> argument_type; 1754 _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; 1755 #endif 1756 1757 _LIBCPP_INLINE_VISIBILITY 1758 size_t operator()(const shared_ptr<_Tp>& __ptr) const _NOEXCEPT 1759 { 1760 return hash<typename shared_ptr<_Tp>::element_type*>()(__ptr.get()); 1761 } 1762 }; 1763 1764 template<class _CharT, class _Traits, class _Yp> 1765 inline _LIBCPP_INLINE_VISIBILITY 1766 basic_ostream<_CharT, _Traits>& 1767 operator<<(basic_ostream<_CharT, _Traits>& __os, shared_ptr<_Yp> const& __p); 1768 1769 1770 #if !defined(_LIBCPP_HAS_NO_THREADS) 1771 1772 class _LIBCPP_TYPE_VIS __sp_mut 1773 { 1774 void* __lx; 1775 public: 1776 void lock() _NOEXCEPT; 1777 void unlock() _NOEXCEPT; 1778 1779 private: 1780 _LIBCPP_CONSTEXPR __sp_mut(void*) _NOEXCEPT; 1781 __sp_mut(const __sp_mut&); 1782 __sp_mut& operator=(const __sp_mut&); 1783 1784 friend _LIBCPP_FUNC_VIS __sp_mut& __get_sp_mut(const void*); 1785 }; 1786 1787 _LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1788 __sp_mut& __get_sp_mut(const void*); 1789 1790 template <class _Tp> 1791 inline _LIBCPP_INLINE_VISIBILITY 1792 bool 1793 atomic_is_lock_free(const shared_ptr<_Tp>*) 1794 { 1795 return false; 1796 } 1797 1798 template <class _Tp> 1799 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1800 shared_ptr<_Tp> 1801 atomic_load(const shared_ptr<_Tp>* __p) 1802 { 1803 __sp_mut& __m = __get_sp_mut(__p); 1804 __m.lock(); 1805 shared_ptr<_Tp> __q = *__p; 1806 __m.unlock(); 1807 return __q; 1808 } 1809 1810 template <class _Tp> 1811 inline _LIBCPP_INLINE_VISIBILITY 1812 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1813 shared_ptr<_Tp> 1814 atomic_load_explicit(const shared_ptr<_Tp>* __p, memory_order) 1815 { 1816 return atomic_load(__p); 1817 } 1818 1819 template <class _Tp> 1820 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1821 void 1822 atomic_store(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) 1823 { 1824 __sp_mut& __m = __get_sp_mut(__p); 1825 __m.lock(); 1826 __p->swap(__r); 1827 __m.unlock(); 1828 } 1829 1830 template <class _Tp> 1831 inline _LIBCPP_INLINE_VISIBILITY 1832 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1833 void 1834 atomic_store_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r, memory_order) 1835 { 1836 atomic_store(__p, __r); 1837 } 1838 1839 template <class _Tp> 1840 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1841 shared_ptr<_Tp> 1842 atomic_exchange(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) 1843 { 1844 __sp_mut& __m = __get_sp_mut(__p); 1845 __m.lock(); 1846 __p->swap(__r); 1847 __m.unlock(); 1848 return __r; 1849 } 1850 1851 template <class _Tp> 1852 inline _LIBCPP_INLINE_VISIBILITY 1853 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1854 shared_ptr<_Tp> 1855 atomic_exchange_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r, memory_order) 1856 { 1857 return atomic_exchange(__p, __r); 1858 } 1859 1860 template <class _Tp> 1861 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1862 bool 1863 atomic_compare_exchange_strong(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w) 1864 { 1865 shared_ptr<_Tp> __temp; 1866 __sp_mut& __m = __get_sp_mut(__p); 1867 __m.lock(); 1868 if (__p->__owner_equivalent(*__v)) 1869 { 1870 _VSTD::swap(__temp, *__p); 1871 *__p = __w; 1872 __m.unlock(); 1873 return true; 1874 } 1875 _VSTD::swap(__temp, *__v); 1876 *__v = *__p; 1877 __m.unlock(); 1878 return false; 1879 } 1880 1881 template <class _Tp> 1882 inline _LIBCPP_INLINE_VISIBILITY 1883 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1884 bool 1885 atomic_compare_exchange_weak(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w) 1886 { 1887 return atomic_compare_exchange_strong(__p, __v, __w); 1888 } 1889 1890 template <class _Tp> 1891 inline _LIBCPP_INLINE_VISIBILITY 1892 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1893 bool 1894 atomic_compare_exchange_strong_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, 1895 shared_ptr<_Tp> __w, memory_order, memory_order) 1896 { 1897 return atomic_compare_exchange_strong(__p, __v, __w); 1898 } 1899 1900 template <class _Tp> 1901 inline _LIBCPP_INLINE_VISIBILITY 1902 _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR 1903 bool 1904 atomic_compare_exchange_weak_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, 1905 shared_ptr<_Tp> __w, memory_order, memory_order) 1906 { 1907 return atomic_compare_exchange_weak(__p, __v, __w); 1908 } 1909 1910 #endif // !defined(_LIBCPP_HAS_NO_THREADS) 1911 1912 _LIBCPP_END_NAMESPACE_STD 1913 1914 #endif // _LIBCPP___MEMORY_SHARED_PTR_H 1915