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Diffstat (limited to 'libcxx/include/__memory/shared_ptr.h')
| -rw-r--r-- | libcxx/include/__memory/shared_ptr.h | 1879 |
1 files changed, 1879 insertions, 0 deletions
diff --git a/libcxx/include/__memory/shared_ptr.h b/libcxx/include/__memory/shared_ptr.h new file mode 100644 index 000000000000..04161c4b73ed --- /dev/null +++ b/libcxx/include/__memory/shared_ptr.h @@ -0,0 +1,1879 @@ +// -*- C++ -*- +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#ifndef _LIBCPP___MEMORY_SHARED_PTR_H +#define _LIBCPP___MEMORY_SHARED_PTR_H + +#include <__availability> +#include <__config> +#include <__functional_base> +#include <__functional/binary_function.h> +#include <__functional/operations.h> +#include <__functional/reference_wrapper.h> +#include <__memory/addressof.h> +#include <__memory/allocation_guard.h> +#include <__memory/allocator_traits.h> +#include <__memory/allocator.h> +#include <__memory/compressed_pair.h> +#include <__memory/pointer_traits.h> +#include <__memory/unique_ptr.h> +#include <__utility/forward.h> +#include <cstddef> +#include <cstdlib> // abort +#include <iosfwd> +#include <stdexcept> +#include <typeinfo> +#include <type_traits> +#include <utility> +#if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER) +# include <atomic> +#endif + +#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) +# include <__memory/auto_ptr.h> +#endif + +#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) +#pragma GCC system_header +#endif + +_LIBCPP_PUSH_MACROS +#include <__undef_macros> + +_LIBCPP_BEGIN_NAMESPACE_STD + +template <class _Alloc> +class __allocator_destructor +{ + typedef _LIBCPP_NODEBUG_TYPE allocator_traits<_Alloc> __alloc_traits; +public: + typedef _LIBCPP_NODEBUG_TYPE typename __alloc_traits::pointer pointer; + typedef _LIBCPP_NODEBUG_TYPE typename __alloc_traits::size_type size_type; +private: + _Alloc& __alloc_; + size_type __s_; +public: + _LIBCPP_INLINE_VISIBILITY __allocator_destructor(_Alloc& __a, size_type __s) + _NOEXCEPT + : __alloc_(__a), __s_(__s) {} + _LIBCPP_INLINE_VISIBILITY + void operator()(pointer __p) _NOEXCEPT + {__alloc_traits::deallocate(__alloc_, __p, __s_);} +}; + +// NOTE: Relaxed and acq/rel atomics (for increment and decrement respectively) +// should be sufficient for thread safety. +// See https://llvm.org/PR22803 +#if defined(__clang__) && __has_builtin(__atomic_add_fetch) \ + && defined(__ATOMIC_RELAXED) \ + && defined(__ATOMIC_ACQ_REL) +# define _LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT +#elif defined(_LIBCPP_COMPILER_GCC) +# define _LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT +#endif + +template <class _ValueType> +inline _LIBCPP_INLINE_VISIBILITY +_ValueType __libcpp_relaxed_load(_ValueType const* __value) { +#if !defined(_LIBCPP_HAS_NO_THREADS) && \ + defined(__ATOMIC_RELAXED) && \ + (__has_builtin(__atomic_load_n) || defined(_LIBCPP_COMPILER_GCC)) + return __atomic_load_n(__value, __ATOMIC_RELAXED); +#else + return *__value; +#endif +} + +template <class _ValueType> +inline _LIBCPP_INLINE_VISIBILITY +_ValueType __libcpp_acquire_load(_ValueType const* __value) { +#if !defined(_LIBCPP_HAS_NO_THREADS) && \ + defined(__ATOMIC_ACQUIRE) && \ + (__has_builtin(__atomic_load_n) || defined(_LIBCPP_COMPILER_GCC)) + return __atomic_load_n(__value, __ATOMIC_ACQUIRE); +#else + return *__value; +#endif +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY _Tp +__libcpp_atomic_refcount_increment(_Tp& __t) _NOEXCEPT +{ +#if defined(_LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT) && !defined(_LIBCPP_HAS_NO_THREADS) + return __atomic_add_fetch(&__t, 1, __ATOMIC_RELAXED); +#else + return __t += 1; +#endif +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY _Tp +__libcpp_atomic_refcount_decrement(_Tp& __t) _NOEXCEPT +{ +#if defined(_LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT) && !defined(_LIBCPP_HAS_NO_THREADS) + return __atomic_add_fetch(&__t, -1, __ATOMIC_ACQ_REL); +#else + return __t -= 1; +#endif +} + +class _LIBCPP_EXCEPTION_ABI bad_weak_ptr + : public std::exception +{ +public: + bad_weak_ptr() _NOEXCEPT = default; + bad_weak_ptr(const bad_weak_ptr&) _NOEXCEPT = default; + virtual ~bad_weak_ptr() _NOEXCEPT; + virtual const char* what() const _NOEXCEPT; +}; + +_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY +void __throw_bad_weak_ptr() +{ +#ifndef _LIBCPP_NO_EXCEPTIONS + throw bad_weak_ptr(); +#else + _VSTD::abort(); +#endif +} + +template<class _Tp> class _LIBCPP_TEMPLATE_VIS weak_ptr; + +class _LIBCPP_TYPE_VIS __shared_count +{ + __shared_count(const __shared_count&); + __shared_count& operator=(const __shared_count&); + +protected: + long __shared_owners_; + virtual ~__shared_count(); +private: + virtual void __on_zero_shared() _NOEXCEPT = 0; + +public: + _LIBCPP_INLINE_VISIBILITY + explicit __shared_count(long __refs = 0) _NOEXCEPT + : __shared_owners_(__refs) {} + +#if defined(_LIBCPP_BUILDING_LIBRARY) && \ + defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS) + void __add_shared() _NOEXCEPT; + bool __release_shared() _NOEXCEPT; +#else + _LIBCPP_INLINE_VISIBILITY + void __add_shared() _NOEXCEPT { + __libcpp_atomic_refcount_increment(__shared_owners_); + } + _LIBCPP_INLINE_VISIBILITY + bool __release_shared() _NOEXCEPT { + if (__libcpp_atomic_refcount_decrement(__shared_owners_) == -1) { + __on_zero_shared(); + return true; + } + return false; + } +#endif + _LIBCPP_INLINE_VISIBILITY + long use_count() const _NOEXCEPT { + return __libcpp_relaxed_load(&__shared_owners_) + 1; + } +}; + +class _LIBCPP_TYPE_VIS __shared_weak_count + : private __shared_count +{ + long __shared_weak_owners_; + +public: + _LIBCPP_INLINE_VISIBILITY + explicit __shared_weak_count(long __refs = 0) _NOEXCEPT + : __shared_count(__refs), + __shared_weak_owners_(__refs) {} +protected: + virtual ~__shared_weak_count(); + +public: +#if defined(_LIBCPP_BUILDING_LIBRARY) && \ + defined(_LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS) + void __add_shared() _NOEXCEPT; + void __add_weak() _NOEXCEPT; + void __release_shared() _NOEXCEPT; +#else + _LIBCPP_INLINE_VISIBILITY + void __add_shared() _NOEXCEPT { + __shared_count::__add_shared(); + } + _LIBCPP_INLINE_VISIBILITY + void __add_weak() _NOEXCEPT { + __libcpp_atomic_refcount_increment(__shared_weak_owners_); + } + _LIBCPP_INLINE_VISIBILITY + void __release_shared() _NOEXCEPT { + if (__shared_count::__release_shared()) + __release_weak(); + } +#endif + void __release_weak() _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + long use_count() const _NOEXCEPT {return __shared_count::use_count();} + __shared_weak_count* lock() _NOEXCEPT; + + virtual const void* __get_deleter(const type_info&) const _NOEXCEPT; +private: + virtual void __on_zero_shared_weak() _NOEXCEPT = 0; +}; + +template <class _Tp, class _Dp, class _Alloc> +class __shared_ptr_pointer + : public __shared_weak_count +{ + __compressed_pair<__compressed_pair<_Tp, _Dp>, _Alloc> __data_; +public: + _LIBCPP_INLINE_VISIBILITY + __shared_ptr_pointer(_Tp __p, _Dp __d, _Alloc __a) + : __data_(__compressed_pair<_Tp, _Dp>(__p, _VSTD::move(__d)), _VSTD::move(__a)) {} + +#ifndef _LIBCPP_NO_RTTI + virtual const void* __get_deleter(const type_info&) const _NOEXCEPT; +#endif + +private: + virtual void __on_zero_shared() _NOEXCEPT; + virtual void __on_zero_shared_weak() _NOEXCEPT; +}; + +#ifndef _LIBCPP_NO_RTTI + +template <class _Tp, class _Dp, class _Alloc> +const void* +__shared_ptr_pointer<_Tp, _Dp, _Alloc>::__get_deleter(const type_info& __t) const _NOEXCEPT +{ + return __t == typeid(_Dp) ? _VSTD::addressof(__data_.first().second()) : nullptr; +} + +#endif // _LIBCPP_NO_RTTI + +template <class _Tp, class _Dp, class _Alloc> +void +__shared_ptr_pointer<_Tp, _Dp, _Alloc>::__on_zero_shared() _NOEXCEPT +{ + __data_.first().second()(__data_.first().first()); + __data_.first().second().~_Dp(); +} + +template <class _Tp, class _Dp, class _Alloc> +void +__shared_ptr_pointer<_Tp, _Dp, _Alloc>::__on_zero_shared_weak() _NOEXCEPT +{ + typedef typename __allocator_traits_rebind<_Alloc, __shared_ptr_pointer>::type _Al; + typedef allocator_traits<_Al> _ATraits; + typedef pointer_traits<typename _ATraits::pointer> _PTraits; + + _Al __a(__data_.second()); + __data_.second().~_Alloc(); + __a.deallocate(_PTraits::pointer_to(*this), 1); +} + +template <class _Tp, class _Alloc> +struct __shared_ptr_emplace + : __shared_weak_count +{ + template<class ..._Args> + _LIBCPP_HIDE_FROM_ABI + explicit __shared_ptr_emplace(_Alloc __a, _Args&& ...__args) + : __storage_(_VSTD::move(__a)) + { +#if _LIBCPP_STD_VER > 17 + using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type; + _TpAlloc __tmp(*__get_alloc()); + allocator_traits<_TpAlloc>::construct(__tmp, __get_elem(), _VSTD::forward<_Args>(__args)...); +#else + ::new ((void*)__get_elem()) _Tp(_VSTD::forward<_Args>(__args)...); +#endif + } + + _LIBCPP_HIDE_FROM_ABI + _Alloc* __get_alloc() _NOEXCEPT { return __storage_.__get_alloc(); } + + _LIBCPP_HIDE_FROM_ABI + _Tp* __get_elem() _NOEXCEPT { return __storage_.__get_elem(); } + +private: + virtual void __on_zero_shared() _NOEXCEPT { +#if _LIBCPP_STD_VER > 17 + using _TpAlloc = typename __allocator_traits_rebind<_Alloc, _Tp>::type; + _TpAlloc __tmp(*__get_alloc()); + allocator_traits<_TpAlloc>::destroy(__tmp, __get_elem()); +#else + __get_elem()->~_Tp(); +#endif + } + + virtual void __on_zero_shared_weak() _NOEXCEPT { + using _ControlBlockAlloc = typename __allocator_traits_rebind<_Alloc, __shared_ptr_emplace>::type; + using _ControlBlockPointer = typename allocator_traits<_ControlBlockAlloc>::pointer; + _ControlBlockAlloc __tmp(*__get_alloc()); + __storage_.~_Storage(); + allocator_traits<_ControlBlockAlloc>::deallocate(__tmp, + pointer_traits<_ControlBlockPointer>::pointer_to(*this), 1); + } + + // This class implements the control block for non-array shared pointers created + // through `std::allocate_shared` and `std::make_shared`. + // + // In previous versions of the library, we used a compressed pair to store + // both the _Alloc and the _Tp. This implies using EBO, which is incompatible + // with Allocator construction for _Tp. To allow implementing P0674 in C++20, + // we now use a properly aligned char buffer while making sure that we maintain + // the same layout that we had when we used a compressed pair. + using _CompressedPair = __compressed_pair<_Alloc, _Tp>; + struct _ALIGNAS_TYPE(_CompressedPair) _Storage { + char __blob_[sizeof(_CompressedPair)]; + + _LIBCPP_HIDE_FROM_ABI explicit _Storage(_Alloc&& __a) { + ::new ((void*)__get_alloc()) _Alloc(_VSTD::move(__a)); + } + _LIBCPP_HIDE_FROM_ABI ~_Storage() { + __get_alloc()->~_Alloc(); + } + _Alloc* __get_alloc() _NOEXCEPT { + _CompressedPair *__as_pair = reinterpret_cast<_CompressedPair*>(__blob_); + typename _CompressedPair::_Base1* __first = _CompressedPair::__get_first_base(__as_pair); + _Alloc *__alloc = reinterpret_cast<_Alloc*>(__first); + return __alloc; + } + _LIBCPP_NO_CFI _Tp* __get_elem() _NOEXCEPT { + _CompressedPair *__as_pair = reinterpret_cast<_CompressedPair*>(__blob_); + typename _CompressedPair::_Base2* __second = _CompressedPair::__get_second_base(__as_pair); + _Tp *__elem = reinterpret_cast<_Tp*>(__second); + return __elem; + } + }; + + static_assert(_LIBCPP_ALIGNOF(_Storage) == _LIBCPP_ALIGNOF(_CompressedPair), ""); + static_assert(sizeof(_Storage) == sizeof(_CompressedPair), ""); + _Storage __storage_; +}; + +struct __shared_ptr_dummy_rebind_allocator_type; +template <> +class _LIBCPP_TEMPLATE_VIS allocator<__shared_ptr_dummy_rebind_allocator_type> +{ +public: + template <class _Other> + struct rebind + { + typedef allocator<_Other> other; + }; +}; + +template<class _Tp> class _LIBCPP_TEMPLATE_VIS enable_shared_from_this; + +template<class _Tp, class _Up> +struct __compatible_with +#if _LIBCPP_STD_VER > 14 + : is_convertible<remove_extent_t<_Tp>*, remove_extent_t<_Up>*> {}; +#else + : is_convertible<_Tp*, _Up*> {}; +#endif // _LIBCPP_STD_VER > 14 + +template <class _Ptr, class = void> +struct __is_deletable : false_type { }; +template <class _Ptr> +struct __is_deletable<_Ptr, decltype(delete declval<_Ptr>())> : true_type { }; + +template <class _Ptr, class = void> +struct __is_array_deletable : false_type { }; +template <class _Ptr> +struct __is_array_deletable<_Ptr, decltype(delete[] declval<_Ptr>())> : true_type { }; + +template <class _Dp, class _Pt, + class = decltype(declval<_Dp>()(declval<_Pt>()))> +static true_type __well_formed_deleter_test(int); + +template <class, class> +static false_type __well_formed_deleter_test(...); + +template <class _Dp, class _Pt> +struct __well_formed_deleter : decltype(__well_formed_deleter_test<_Dp, _Pt>(0)) {}; + +template<class _Dp, class _Tp, class _Yp> +struct __shared_ptr_deleter_ctor_reqs +{ + static const bool value = __compatible_with<_Tp, _Yp>::value && + is_move_constructible<_Dp>::value && + __well_formed_deleter<_Dp, _Tp*>::value; +}; + +#if defined(_LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI) +# define _LIBCPP_SHARED_PTR_TRIVIAL_ABI __attribute__((trivial_abi)) +#else +# define _LIBCPP_SHARED_PTR_TRIVIAL_ABI +#endif + +template<class _Tp> +class _LIBCPP_SHARED_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS shared_ptr +{ +public: +#if _LIBCPP_STD_VER > 14 + typedef weak_ptr<_Tp> weak_type; + typedef remove_extent_t<_Tp> element_type; +#else + typedef _Tp element_type; +#endif + +private: + element_type* __ptr_; + __shared_weak_count* __cntrl_; + + struct __nat {int __for_bool_;}; +public: + _LIBCPP_INLINE_VISIBILITY + _LIBCPP_CONSTEXPR shared_ptr() _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + _LIBCPP_CONSTEXPR shared_ptr(nullptr_t) _NOEXCEPT; + + template<class _Yp, class = _EnableIf< + _And< + __compatible_with<_Yp, _Tp> + // In C++03 we get errors when trying to do SFINAE with the + // delete operator, so we always pretend that it's deletable. + // The same happens on GCC. +#if !defined(_LIBCPP_CXX03_LANG) && !defined(_LIBCPP_COMPILER_GCC) + , _If<is_array<_Tp>::value, __is_array_deletable<_Yp*>, __is_deletable<_Yp*> > +#endif + >::value + > > + explicit shared_ptr(_Yp* __p) : __ptr_(__p) { + unique_ptr<_Yp> __hold(__p); + typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; + typedef __shared_ptr_pointer<_Yp*, __shared_ptr_default_delete<_Tp, _Yp>, _AllocT > _CntrlBlk; + __cntrl_ = new _CntrlBlk(__p, __shared_ptr_default_delete<_Tp, _Yp>(), _AllocT()); + __hold.release(); + __enable_weak_this(__p, __p); + } + + template<class _Yp, class _Dp> + shared_ptr(_Yp* __p, _Dp __d, + typename enable_if<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value, __nat>::type = __nat()); + template<class _Yp, class _Dp, class _Alloc> + shared_ptr(_Yp* __p, _Dp __d, _Alloc __a, + typename enable_if<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value, __nat>::type = __nat()); + template <class _Dp> shared_ptr(nullptr_t __p, _Dp __d); + template <class _Dp, class _Alloc> shared_ptr(nullptr_t __p, _Dp __d, _Alloc __a); + template<class _Yp> _LIBCPP_INLINE_VISIBILITY shared_ptr(const shared_ptr<_Yp>& __r, element_type* __p) _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + shared_ptr(const shared_ptr& __r) _NOEXCEPT; + template<class _Yp> + _LIBCPP_INLINE_VISIBILITY + shared_ptr(const shared_ptr<_Yp>& __r, + typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat()) + _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + shared_ptr(shared_ptr&& __r) _NOEXCEPT; + template<class _Yp> _LIBCPP_INLINE_VISIBILITY shared_ptr(shared_ptr<_Yp>&& __r, + typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type = __nat()) + _NOEXCEPT; + template<class _Yp> explicit shared_ptr(const weak_ptr<_Yp>& __r, + typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type= __nat()); +#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) + template<class _Yp> + shared_ptr(auto_ptr<_Yp>&& __r, + typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type = __nat()); +#endif + template <class _Yp, class _Dp> + shared_ptr(unique_ptr<_Yp, _Dp>&&, + typename enable_if + < + !is_lvalue_reference<_Dp>::value && + is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value, + __nat + >::type = __nat()); + template <class _Yp, class _Dp> + shared_ptr(unique_ptr<_Yp, _Dp>&&, + typename enable_if + < + is_lvalue_reference<_Dp>::value && + is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value, + __nat + >::type = __nat()); + + ~shared_ptr(); + + _LIBCPP_INLINE_VISIBILITY + shared_ptr& operator=(const shared_ptr& __r) _NOEXCEPT; + template<class _Yp> + typename enable_if + < + __compatible_with<_Yp, element_type>::value, + shared_ptr& + >::type + _LIBCPP_INLINE_VISIBILITY + operator=(const shared_ptr<_Yp>& __r) _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + shared_ptr& operator=(shared_ptr&& __r) _NOEXCEPT; + template<class _Yp> + typename enable_if + < + __compatible_with<_Yp, element_type>::value, + shared_ptr& + >::type + _LIBCPP_INLINE_VISIBILITY + operator=(shared_ptr<_Yp>&& __r); +#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) + template<class _Yp> + _LIBCPP_INLINE_VISIBILITY + typename enable_if + < + !is_array<_Yp>::value && + is_convertible<_Yp*, element_type*>::value, + shared_ptr + >::type& + operator=(auto_ptr<_Yp>&& __r); +#endif + template <class _Yp, class _Dp> + typename enable_if + < + is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value, + shared_ptr& + >::type + _LIBCPP_INLINE_VISIBILITY + operator=(unique_ptr<_Yp, _Dp>&& __r); + + _LIBCPP_INLINE_VISIBILITY + void swap(shared_ptr& __r) _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + void reset() _NOEXCEPT; + template<class _Yp> + typename enable_if + < + __compatible_with<_Yp, element_type>::value, + void + >::type + _LIBCPP_INLINE_VISIBILITY + reset(_Yp* __p); + template<class _Yp, class _Dp> + typename enable_if + < + __compatible_with<_Yp, element_type>::value, + void + >::type + _LIBCPP_INLINE_VISIBILITY + reset(_Yp* __p, _Dp __d); + template<class _Yp, class _Dp, class _Alloc> + typename enable_if + < + __compatible_with<_Yp, element_type>::value, + void + >::type + _LIBCPP_INLINE_VISIBILITY + reset(_Yp* __p, _Dp __d, _Alloc __a); + + _LIBCPP_INLINE_VISIBILITY + element_type* get() const _NOEXCEPT {return __ptr_;} + _LIBCPP_INLINE_VISIBILITY + typename add_lvalue_reference<element_type>::type operator*() const _NOEXCEPT + {return *__ptr_;} + _LIBCPP_INLINE_VISIBILITY + element_type* operator->() const _NOEXCEPT + { + static_assert(!is_array<_Tp>::value, + "std::shared_ptr<T>::operator-> is only valid when T is not an array type."); + return __ptr_; + } + _LIBCPP_INLINE_VISIBILITY + long use_count() const _NOEXCEPT {return __cntrl_ ? __cntrl_->use_count() : 0;} + _LIBCPP_INLINE_VISIBILITY + bool unique() const _NOEXCEPT {return use_count() == 1;} + _LIBCPP_INLINE_VISIBILITY + explicit operator bool() const _NOEXCEPT {return get() != nullptr;} + template <class _Up> + _LIBCPP_INLINE_VISIBILITY + bool owner_before(shared_ptr<_Up> const& __p) const _NOEXCEPT + {return __cntrl_ < __p.__cntrl_;} + template <class _Up> + _LIBCPP_INLINE_VISIBILITY + bool owner_before(weak_ptr<_Up> const& __p) const _NOEXCEPT + {return __cntrl_ < __p.__cntrl_;} + _LIBCPP_INLINE_VISIBILITY + bool + __owner_equivalent(const shared_ptr& __p) const + {return __cntrl_ == __p.__cntrl_;} + +#if _LIBCPP_STD_VER > 14 + typename add_lvalue_reference<element_type>::type + _LIBCPP_INLINE_VISIBILITY + operator[](ptrdiff_t __i) const + { + static_assert(is_array<_Tp>::value, + "std::shared_ptr<T>::operator[] is only valid when T is an array type."); + return __ptr_[__i]; + } +#endif + +#ifndef _LIBCPP_NO_RTTI + template <class _Dp> + _LIBCPP_INLINE_VISIBILITY + _Dp* __get_deleter() const _NOEXCEPT + {return static_cast<_Dp*>(__cntrl_ + ? const_cast<void *>(__cntrl_->__get_deleter(typeid(_Dp))) + : nullptr);} +#endif // _LIBCPP_NO_RTTI + + template<class _Yp, class _CntrlBlk> + static shared_ptr<_Tp> + __create_with_control_block(_Yp* __p, _CntrlBlk* __cntrl) _NOEXCEPT + { + shared_ptr<_Tp> __r; + __r.__ptr_ = __p; + __r.__cntrl_ = __cntrl; + __r.__enable_weak_this(__r.__ptr_, __r.__ptr_); + return __r; + } + +private: + template <class _Yp, bool = is_function<_Yp>::value> + struct __shared_ptr_default_allocator + { + typedef allocator<_Yp> type; + }; + + template <class _Yp> + struct __shared_ptr_default_allocator<_Yp, true> + { + typedef allocator<__shared_ptr_dummy_rebind_allocator_type> type; + }; + + template <class _Yp, class _OrigPtr> + _LIBCPP_INLINE_VISIBILITY + typename enable_if<is_convertible<_OrigPtr*, + const enable_shared_from_this<_Yp>* + >::value, + void>::type + __enable_weak_this(const enable_shared_from_this<_Yp>* __e, + _OrigPtr* __ptr) _NOEXCEPT + { + typedef typename remove_cv<_Yp>::type _RawYp; + if (__e && __e->__weak_this_.expired()) + { + __e->__weak_this_ = shared_ptr<_RawYp>(*this, + const_cast<_RawYp*>(static_cast<const _Yp*>(__ptr))); + } + } + + _LIBCPP_INLINE_VISIBILITY void __enable_weak_this(...) _NOEXCEPT {} + + template <class, class _Yp> + struct __shared_ptr_default_delete + : default_delete<_Yp> {}; + + template <class _Yp, class _Un, size_t _Sz> + struct __shared_ptr_default_delete<_Yp[_Sz], _Un> + : default_delete<_Yp[]> {}; + + template <class _Yp, class _Un> + struct __shared_ptr_default_delete<_Yp[], _Un> + : default_delete<_Yp[]> {}; + + template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr; + template <class _Up> friend class _LIBCPP_TEMPLATE_VIS weak_ptr; +}; + +#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES +template<class _Tp> +shared_ptr(weak_ptr<_Tp>) -> shared_ptr<_Tp>; +template<class _Tp, class _Dp> +shared_ptr(unique_ptr<_Tp, _Dp>) -> shared_ptr<_Tp>; +#endif + +template<class _Tp> +inline +_LIBCPP_CONSTEXPR +shared_ptr<_Tp>::shared_ptr() _NOEXCEPT + : __ptr_(nullptr), + __cntrl_(nullptr) +{ +} + +template<class _Tp> +inline +_LIBCPP_CONSTEXPR +shared_ptr<_Tp>::shared_ptr(nullptr_t) _NOEXCEPT + : __ptr_(nullptr), + __cntrl_(nullptr) +{ +} + +template<class _Tp> +template<class _Yp, class _Dp> +shared_ptr<_Tp>::shared_ptr(_Yp* __p, _Dp __d, + typename enable_if<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value, __nat>::type) + : __ptr_(__p) +{ +#ifndef _LIBCPP_NO_EXCEPTIONS + try + { +#endif // _LIBCPP_NO_EXCEPTIONS + typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; + typedef __shared_ptr_pointer<_Yp*, _Dp, _AllocT > _CntrlBlk; +#ifndef _LIBCPP_CXX03_LANG + __cntrl_ = new _CntrlBlk(__p, _VSTD::move(__d), _AllocT()); +#else + __cntrl_ = new _CntrlBlk(__p, __d, _AllocT()); +#endif // not _LIBCPP_CXX03_LANG + __enable_weak_this(__p, __p); +#ifndef _LIBCPP_NO_EXCEPTIONS + } + catch (...) + { + __d(__p); + throw; + } +#endif // _LIBCPP_NO_EXCEPTIONS +} + +template<class _Tp> +template<class _Dp> +shared_ptr<_Tp>::shared_ptr(nullptr_t __p, _Dp __d) + : __ptr_(nullptr) +{ +#ifndef _LIBCPP_NO_EXCEPTIONS + try + { +#endif // _LIBCPP_NO_EXCEPTIONS + typedef typename __shared_ptr_default_allocator<_Tp>::type _AllocT; + typedef __shared_ptr_pointer<nullptr_t, _Dp, _AllocT > _CntrlBlk; +#ifndef _LIBCPP_CXX03_LANG + __cntrl_ = new _CntrlBlk(__p, _VSTD::move(__d), _AllocT()); +#else + __cntrl_ = new _CntrlBlk(__p, __d, _AllocT()); +#endif // not _LIBCPP_CXX03_LANG +#ifndef _LIBCPP_NO_EXCEPTIONS + } + catch (...) + { + __d(__p); + throw; + } +#endif // _LIBCPP_NO_EXCEPTIONS +} + +template<class _Tp> +template<class _Yp, class _Dp, class _Alloc> +shared_ptr<_Tp>::shared_ptr(_Yp* __p, _Dp __d, _Alloc __a, + typename enable_if<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value, __nat>::type) + : __ptr_(__p) +{ +#ifndef _LIBCPP_NO_EXCEPTIONS + try + { +#endif // _LIBCPP_NO_EXCEPTIONS + typedef __shared_ptr_pointer<_Yp*, _Dp, _Alloc> _CntrlBlk; + typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2; + typedef __allocator_destructor<_A2> _D2; + _A2 __a2(__a); + unique_ptr<_CntrlBlk, _D2> __hold2(__a2.allocate(1), _D2(__a2, 1)); + ::new ((void*)_VSTD::addressof(*__hold2.get())) +#ifndef _LIBCPP_CXX03_LANG + _CntrlBlk(__p, _VSTD::move(__d), __a); +#else + _CntrlBlk(__p, __d, __a); +#endif // not _LIBCPP_CXX03_LANG + __cntrl_ = _VSTD::addressof(*__hold2.release()); + __enable_weak_this(__p, __p); +#ifndef _LIBCPP_NO_EXCEPTIONS + } + catch (...) + { + __d(__p); + throw; + } +#endif // _LIBCPP_NO_EXCEPTIONS +} + +template<class _Tp> +template<class _Dp, class _Alloc> +shared_ptr<_Tp>::shared_ptr(nullptr_t __p, _Dp __d, _Alloc __a) + : __ptr_(nullptr) +{ +#ifndef _LIBCPP_NO_EXCEPTIONS + try + { +#endif // _LIBCPP_NO_EXCEPTIONS + typedef __shared_ptr_pointer<nullptr_t, _Dp, _Alloc> _CntrlBlk; + typedef typename __allocator_traits_rebind<_Alloc, _CntrlBlk>::type _A2; + typedef __allocator_destructor<_A2> _D2; + _A2 __a2(__a); + unique_ptr<_CntrlBlk, _D2> __hold2(__a2.allocate(1), _D2(__a2, 1)); + ::new ((void*)_VSTD::addressof(*__hold2.get())) +#ifndef _LIBCPP_CXX03_LANG + _CntrlBlk(__p, _VSTD::move(__d), __a); +#else + _CntrlBlk(__p, __d, __a); +#endif // not _LIBCPP_CXX03_LANG + __cntrl_ = _VSTD::addressof(*__hold2.release()); +#ifndef _LIBCPP_NO_EXCEPTIONS + } + catch (...) + { + __d(__p); + throw; + } +#endif // _LIBCPP_NO_EXCEPTIONS +} + +template<class _Tp> +template<class _Yp> +inline +shared_ptr<_Tp>::shared_ptr(const shared_ptr<_Yp>& __r, element_type *__p) _NOEXCEPT + : __ptr_(__p), + __cntrl_(__r.__cntrl_) +{ + if (__cntrl_) + __cntrl_->__add_shared(); +} + +template<class _Tp> +inline +shared_ptr<_Tp>::shared_ptr(const shared_ptr& __r) _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + if (__cntrl_) + __cntrl_->__add_shared(); +} + +template<class _Tp> +template<class _Yp> +inline +shared_ptr<_Tp>::shared_ptr(const shared_ptr<_Yp>& __r, + typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type) + _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + if (__cntrl_) + __cntrl_->__add_shared(); +} + +template<class _Tp> +inline +shared_ptr<_Tp>::shared_ptr(shared_ptr&& __r) _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + __r.__ptr_ = nullptr; + __r.__cntrl_ = nullptr; +} + +template<class _Tp> +template<class _Yp> +inline +shared_ptr<_Tp>::shared_ptr(shared_ptr<_Yp>&& __r, + typename enable_if<__compatible_with<_Yp, element_type>::value, __nat>::type) + _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + __r.__ptr_ = nullptr; + __r.__cntrl_ = nullptr; +} + +#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) +template<class _Tp> +template<class _Yp> +shared_ptr<_Tp>::shared_ptr(auto_ptr<_Yp>&& __r, + typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type) + : __ptr_(__r.get()) +{ + typedef __shared_ptr_pointer<_Yp*, default_delete<_Yp>, allocator<_Yp> > _CntrlBlk; + __cntrl_ = new _CntrlBlk(__r.get(), default_delete<_Yp>(), allocator<_Yp>()); + __enable_weak_this(__r.get(), __r.get()); + __r.release(); +} +#endif + +template<class _Tp> +template <class _Yp, class _Dp> +shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp>&& __r, + typename enable_if + < + !is_lvalue_reference<_Dp>::value && + is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value, + __nat + >::type) + : __ptr_(__r.get()) +{ +#if _LIBCPP_STD_VER > 11 + if (__ptr_ == nullptr) + __cntrl_ = nullptr; + else +#endif + { + typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; + typedef __shared_ptr_pointer<typename unique_ptr<_Yp, _Dp>::pointer, _Dp, _AllocT > _CntrlBlk; + __cntrl_ = new _CntrlBlk(__r.get(), __r.get_deleter(), _AllocT()); + __enable_weak_this(__r.get(), __r.get()); + } + __r.release(); +} + +template<class _Tp> +template <class _Yp, class _Dp> +shared_ptr<_Tp>::shared_ptr(unique_ptr<_Yp, _Dp>&& __r, + typename enable_if + < + is_lvalue_reference<_Dp>::value && + is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value, + __nat + >::type) + : __ptr_(__r.get()) +{ +#if _LIBCPP_STD_VER > 11 + if (__ptr_ == nullptr) + __cntrl_ = nullptr; + else +#endif + { + typedef typename __shared_ptr_default_allocator<_Yp>::type _AllocT; + typedef __shared_ptr_pointer<typename unique_ptr<_Yp, _Dp>::pointer, + reference_wrapper<typename remove_reference<_Dp>::type>, + _AllocT > _CntrlBlk; + __cntrl_ = new _CntrlBlk(__r.get(), _VSTD::ref(__r.get_deleter()), _AllocT()); + __enable_weak_this(__r.get(), __r.get()); + } + __r.release(); +} + +template<class _Tp> +shared_ptr<_Tp>::~shared_ptr() +{ + if (__cntrl_) + __cntrl_->__release_shared(); +} + +template<class _Tp> +inline +shared_ptr<_Tp>& +shared_ptr<_Tp>::operator=(const shared_ptr& __r) _NOEXCEPT +{ + shared_ptr(__r).swap(*this); + return *this; +} + +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value, + shared_ptr<_Tp>& +>::type +shared_ptr<_Tp>::operator=(const shared_ptr<_Yp>& __r) _NOEXCEPT +{ + shared_ptr(__r).swap(*this); + return *this; +} + +template<class _Tp> +inline +shared_ptr<_Tp>& +shared_ptr<_Tp>::operator=(shared_ptr&& __r) _NOEXCEPT +{ + shared_ptr(_VSTD::move(__r)).swap(*this); + return *this; +} + +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value, + shared_ptr<_Tp>& +>::type +shared_ptr<_Tp>::operator=(shared_ptr<_Yp>&& __r) +{ + shared_ptr(_VSTD::move(__r)).swap(*this); + return *this; +} + +#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR) +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + !is_array<_Yp>::value && + is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value, + shared_ptr<_Tp> +>::type& +shared_ptr<_Tp>::operator=(auto_ptr<_Yp>&& __r) +{ + shared_ptr(_VSTD::move(__r)).swap(*this); + return *this; +} +#endif + +template<class _Tp> +template <class _Yp, class _Dp> +inline +typename enable_if +< + is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, + typename shared_ptr<_Tp>::element_type*>::value, + shared_ptr<_Tp>& +>::type +shared_ptr<_Tp>::operator=(unique_ptr<_Yp, _Dp>&& __r) +{ + shared_ptr(_VSTD::move(__r)).swap(*this); + return *this; +} + +template<class _Tp> +inline +void +shared_ptr<_Tp>::swap(shared_ptr& __r) _NOEXCEPT +{ + _VSTD::swap(__ptr_, __r.__ptr_); + _VSTD::swap(__cntrl_, __r.__cntrl_); +} + +template<class _Tp> +inline +void +shared_ptr<_Tp>::reset() _NOEXCEPT +{ + shared_ptr().swap(*this); +} + +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value, + void +>::type +shared_ptr<_Tp>::reset(_Yp* __p) +{ + shared_ptr(__p).swap(*this); +} + +template<class _Tp> +template<class _Yp, class _Dp> +inline +typename enable_if +< + __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value, + void +>::type +shared_ptr<_Tp>::reset(_Yp* __p, _Dp __d) +{ + shared_ptr(__p, __d).swap(*this); +} + +template<class _Tp> +template<class _Yp, class _Dp, class _Alloc> +inline +typename enable_if +< + __compatible_with<_Yp, typename shared_ptr<_Tp>::element_type>::value, + void +>::type +shared_ptr<_Tp>::reset(_Yp* __p, _Dp __d, _Alloc __a) +{ + shared_ptr(__p, __d, __a).swap(*this); +} + +// +// std::allocate_shared and std::make_shared +// +template<class _Tp, class _Alloc, class ..._Args, class = _EnableIf<!is_array<_Tp>::value> > +_LIBCPP_HIDE_FROM_ABI +shared_ptr<_Tp> allocate_shared(const _Alloc& __a, _Args&& ...__args) +{ + using _ControlBlock = __shared_ptr_emplace<_Tp, _Alloc>; + using _ControlBlockAllocator = typename __allocator_traits_rebind<_Alloc, _ControlBlock>::type; + __allocation_guard<_ControlBlockAllocator> __guard(__a, 1); + ::new ((void*)_VSTD::addressof(*__guard.__get())) _ControlBlock(__a, _VSTD::forward<_Args>(__args)...); + auto __control_block = __guard.__release_ptr(); + return shared_ptr<_Tp>::__create_with_control_block((*__control_block).__get_elem(), _VSTD::addressof(*__control_block)); +} + +template<class _Tp, class ..._Args, class = _EnableIf<!is_array<_Tp>::value> > +_LIBCPP_HIDE_FROM_ABI +shared_ptr<_Tp> make_shared(_Args&& ...__args) +{ + return _VSTD::allocate_shared<_Tp>(allocator<_Tp>(), _VSTD::forward<_Args>(__args)...); +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator==(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT +{ + return __x.get() == __y.get(); +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator!=(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT +{ + return !(__x == __y); +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator<(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT +{ +#if _LIBCPP_STD_VER <= 11 + typedef typename common_type<_Tp*, _Up*>::type _Vp; + return less<_Vp>()(__x.get(), __y.get()); +#else + return less<>()(__x.get(), __y.get()); +#endif + +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator>(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT +{ + return __y < __x; +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator<=(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT +{ + return !(__y < __x); +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator>=(const shared_ptr<_Tp>& __x, const shared_ptr<_Up>& __y) _NOEXCEPT +{ + return !(__x < __y); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator==(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT +{ + return !__x; +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator==(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT +{ + return !__x; +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator!=(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT +{ + return static_cast<bool>(__x); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator!=(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT +{ + return static_cast<bool>(__x); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator<(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT +{ + return less<_Tp*>()(__x.get(), nullptr); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator<(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT +{ + return less<_Tp*>()(nullptr, __x.get()); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator>(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT +{ + return nullptr < __x; +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator>(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT +{ + return __x < nullptr; +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator<=(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT +{ + return !(nullptr < __x); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator<=(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT +{ + return !(__x < nullptr); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator>=(const shared_ptr<_Tp>& __x, nullptr_t) _NOEXCEPT +{ + return !(__x < nullptr); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +operator>=(nullptr_t, const shared_ptr<_Tp>& __x) _NOEXCEPT +{ + return !(nullptr < __x); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +void +swap(shared_ptr<_Tp>& __x, shared_ptr<_Tp>& __y) _NOEXCEPT +{ + __x.swap(__y); +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +shared_ptr<_Tp> +static_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT +{ + return shared_ptr<_Tp>(__r, + static_cast< + typename shared_ptr<_Tp>::element_type*>(__r.get())); +} + +template<class _Tp, class _Up> +inline _LIBCPP_INLINE_VISIBILITY +shared_ptr<_Tp> +dynamic_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT +{ + typedef typename shared_ptr<_Tp>::element_type _ET; + _ET* __p = dynamic_cast<_ET*>(__r.get()); + return __p ? shared_ptr<_Tp>(__r, __p) : shared_ptr<_Tp>(); +} + +template<class _Tp, class _Up> +shared_ptr<_Tp> +const_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT +{ + typedef typename shared_ptr<_Tp>::element_type _RTp; + return shared_ptr<_Tp>(__r, const_cast<_RTp*>(__r.get())); +} + +template<class _Tp, class _Up> +shared_ptr<_Tp> +reinterpret_pointer_cast(const shared_ptr<_Up>& __r) _NOEXCEPT +{ + return shared_ptr<_Tp>(__r, + reinterpret_cast< + typename shared_ptr<_Tp>::element_type*>(__r.get())); +} + +#ifndef _LIBCPP_NO_RTTI + +template<class _Dp, class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_Dp* +get_deleter(const shared_ptr<_Tp>& __p) _NOEXCEPT +{ + return __p.template __get_deleter<_Dp>(); +} + +#endif // _LIBCPP_NO_RTTI + +template<class _Tp> +class _LIBCPP_SHARED_PTR_TRIVIAL_ABI _LIBCPP_TEMPLATE_VIS weak_ptr +{ +public: + typedef _Tp element_type; +private: + element_type* __ptr_; + __shared_weak_count* __cntrl_; + +public: + _LIBCPP_INLINE_VISIBILITY + _LIBCPP_CONSTEXPR weak_ptr() _NOEXCEPT; + template<class _Yp> _LIBCPP_INLINE_VISIBILITY weak_ptr(shared_ptr<_Yp> const& __r, + typename enable_if<is_convertible<_Yp*, _Tp*>::value, __nat*>::type = 0) + _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + weak_ptr(weak_ptr const& __r) _NOEXCEPT; + template<class _Yp> _LIBCPP_INLINE_VISIBILITY weak_ptr(weak_ptr<_Yp> const& __r, + typename enable_if<is_convertible<_Yp*, _Tp*>::value, __nat*>::type = 0) + _NOEXCEPT; + + _LIBCPP_INLINE_VISIBILITY + weak_ptr(weak_ptr&& __r) _NOEXCEPT; + template<class _Yp> _LIBCPP_INLINE_VISIBILITY weak_ptr(weak_ptr<_Yp>&& __r, + typename enable_if<is_convertible<_Yp*, _Tp*>::value, __nat*>::type = 0) + _NOEXCEPT; + ~weak_ptr(); + + _LIBCPP_INLINE_VISIBILITY + weak_ptr& operator=(weak_ptr const& __r) _NOEXCEPT; + template<class _Yp> + typename enable_if + < + is_convertible<_Yp*, element_type*>::value, + weak_ptr& + >::type + _LIBCPP_INLINE_VISIBILITY + operator=(weak_ptr<_Yp> const& __r) _NOEXCEPT; + + _LIBCPP_INLINE_VISIBILITY + weak_ptr& operator=(weak_ptr&& __r) _NOEXCEPT; + template<class _Yp> + typename enable_if + < + is_convertible<_Yp*, element_type*>::value, + weak_ptr& + >::type + _LIBCPP_INLINE_VISIBILITY + operator=(weak_ptr<_Yp>&& __r) _NOEXCEPT; + + template<class _Yp> + typename enable_if + < + is_convertible<_Yp*, element_type*>::value, + weak_ptr& + >::type + _LIBCPP_INLINE_VISIBILITY + operator=(shared_ptr<_Yp> const& __r) _NOEXCEPT; + + _LIBCPP_INLINE_VISIBILITY + void swap(weak_ptr& __r) _NOEXCEPT; + _LIBCPP_INLINE_VISIBILITY + void reset() _NOEXCEPT; + + _LIBCPP_INLINE_VISIBILITY + long use_count() const _NOEXCEPT + {return __cntrl_ ? __cntrl_->use_count() : 0;} + _LIBCPP_INLINE_VISIBILITY + bool expired() const _NOEXCEPT + {return __cntrl_ == nullptr || __cntrl_->use_count() == 0;} + shared_ptr<_Tp> lock() const _NOEXCEPT; + template<class _Up> + _LIBCPP_INLINE_VISIBILITY + bool owner_before(const shared_ptr<_Up>& __r) const _NOEXCEPT + {return __cntrl_ < __r.__cntrl_;} + template<class _Up> + _LIBCPP_INLINE_VISIBILITY + bool owner_before(const weak_ptr<_Up>& __r) const _NOEXCEPT + {return __cntrl_ < __r.__cntrl_;} + + template <class _Up> friend class _LIBCPP_TEMPLATE_VIS weak_ptr; + template <class _Up> friend class _LIBCPP_TEMPLATE_VIS shared_ptr; +}; + +#ifndef _LIBCPP_HAS_NO_DEDUCTION_GUIDES +template<class _Tp> +weak_ptr(shared_ptr<_Tp>) -> weak_ptr<_Tp>; +#endif + +template<class _Tp> +inline +_LIBCPP_CONSTEXPR +weak_ptr<_Tp>::weak_ptr() _NOEXCEPT + : __ptr_(nullptr), + __cntrl_(nullptr) +{ +} + +template<class _Tp> +inline +weak_ptr<_Tp>::weak_ptr(weak_ptr const& __r) _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + if (__cntrl_) + __cntrl_->__add_weak(); +} + +template<class _Tp> +template<class _Yp> +inline +weak_ptr<_Tp>::weak_ptr(shared_ptr<_Yp> const& __r, + typename enable_if<is_convertible<_Yp*, _Tp*>::value, __nat*>::type) + _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + if (__cntrl_) + __cntrl_->__add_weak(); +} + +template<class _Tp> +template<class _Yp> +inline +weak_ptr<_Tp>::weak_ptr(weak_ptr<_Yp> const& __r, + typename enable_if<is_convertible<_Yp*, _Tp*>::value, __nat*>::type) + _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + if (__cntrl_) + __cntrl_->__add_weak(); +} + +template<class _Tp> +inline +weak_ptr<_Tp>::weak_ptr(weak_ptr&& __r) _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + __r.__ptr_ = nullptr; + __r.__cntrl_ = nullptr; +} + +template<class _Tp> +template<class _Yp> +inline +weak_ptr<_Tp>::weak_ptr(weak_ptr<_Yp>&& __r, + typename enable_if<is_convertible<_Yp*, _Tp*>::value, __nat*>::type) + _NOEXCEPT + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_) +{ + __r.__ptr_ = nullptr; + __r.__cntrl_ = nullptr; +} + +template<class _Tp> +weak_ptr<_Tp>::~weak_ptr() +{ + if (__cntrl_) + __cntrl_->__release_weak(); +} + +template<class _Tp> +inline +weak_ptr<_Tp>& +weak_ptr<_Tp>::operator=(weak_ptr const& __r) _NOEXCEPT +{ + weak_ptr(__r).swap(*this); + return *this; +} + +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + is_convertible<_Yp*, _Tp*>::value, + weak_ptr<_Tp>& +>::type +weak_ptr<_Tp>::operator=(weak_ptr<_Yp> const& __r) _NOEXCEPT +{ + weak_ptr(__r).swap(*this); + return *this; +} + +template<class _Tp> +inline +weak_ptr<_Tp>& +weak_ptr<_Tp>::operator=(weak_ptr&& __r) _NOEXCEPT +{ + weak_ptr(_VSTD::move(__r)).swap(*this); + return *this; +} + +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + is_convertible<_Yp*, _Tp*>::value, + weak_ptr<_Tp>& +>::type +weak_ptr<_Tp>::operator=(weak_ptr<_Yp>&& __r) _NOEXCEPT +{ + weak_ptr(_VSTD::move(__r)).swap(*this); + return *this; +} + +template<class _Tp> +template<class _Yp> +inline +typename enable_if +< + is_convertible<_Yp*, _Tp*>::value, + weak_ptr<_Tp>& +>::type +weak_ptr<_Tp>::operator=(shared_ptr<_Yp> const& __r) _NOEXCEPT +{ + weak_ptr(__r).swap(*this); + return *this; +} + +template<class _Tp> +inline +void +weak_ptr<_Tp>::swap(weak_ptr& __r) _NOEXCEPT +{ + _VSTD::swap(__ptr_, __r.__ptr_); + _VSTD::swap(__cntrl_, __r.__cntrl_); +} + +template<class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +void +swap(weak_ptr<_Tp>& __x, weak_ptr<_Tp>& __y) _NOEXCEPT +{ + __x.swap(__y); +} + +template<class _Tp> +inline +void +weak_ptr<_Tp>::reset() _NOEXCEPT +{ + weak_ptr().swap(*this); +} + +template<class _Tp> +template<class _Yp> +shared_ptr<_Tp>::shared_ptr(const weak_ptr<_Yp>& __r, + typename enable_if<is_convertible<_Yp*, element_type*>::value, __nat>::type) + : __ptr_(__r.__ptr_), + __cntrl_(__r.__cntrl_ ? __r.__cntrl_->lock() : __r.__cntrl_) +{ + if (__cntrl_ == nullptr) + __throw_bad_weak_ptr(); +} + +template<class _Tp> +shared_ptr<_Tp> +weak_ptr<_Tp>::lock() const _NOEXCEPT +{ + shared_ptr<_Tp> __r; + __r.__cntrl_ = __cntrl_ ? __cntrl_->lock() : __cntrl_; + if (__r.__cntrl_) + __r.__ptr_ = __ptr_; + return __r; +} + +#if _LIBCPP_STD_VER > 14 +template <class _Tp = void> struct owner_less; +#else +template <class _Tp> struct owner_less; +#endif + + +_LIBCPP_SUPPRESS_DEPRECATED_PUSH +template <class _Tp> +struct _LIBCPP_TEMPLATE_VIS owner_less<shared_ptr<_Tp> > +#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) + : binary_function<shared_ptr<_Tp>, shared_ptr<_Tp>, bool> +#endif +{ +_LIBCPP_SUPPRESS_DEPRECATED_POP +#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) + _LIBCPP_DEPRECATED_IN_CXX17 typedef bool result_type; + _LIBCPP_DEPRECATED_IN_CXX17 typedef shared_ptr<_Tp> first_argument_type; + _LIBCPP_DEPRECATED_IN_CXX17 typedef shared_ptr<_Tp> second_argument_type; +#endif + _LIBCPP_INLINE_VISIBILITY + bool operator()(shared_ptr<_Tp> const& __x, shared_ptr<_Tp> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + _LIBCPP_INLINE_VISIBILITY + bool operator()(shared_ptr<_Tp> const& __x, weak_ptr<_Tp> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + _LIBCPP_INLINE_VISIBILITY + bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Tp> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} +}; + +_LIBCPP_SUPPRESS_DEPRECATED_PUSH +template <class _Tp> +struct _LIBCPP_TEMPLATE_VIS owner_less<weak_ptr<_Tp> > +#if !defined(_LIBCPP_ABI_NO_BINDER_BASES) + : binary_function<weak_ptr<_Tp>, weak_ptr<_Tp>, bool> +#endif +{ +_LIBCPP_SUPPRESS_DEPRECATED_POP +#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) + _LIBCPP_DEPRECATED_IN_CXX17 typedef bool result_type; + _LIBCPP_DEPRECATED_IN_CXX17 typedef weak_ptr<_Tp> first_argument_type; + _LIBCPP_DEPRECATED_IN_CXX17 typedef weak_ptr<_Tp> second_argument_type; +#endif + _LIBCPP_INLINE_VISIBILITY + bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Tp> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + _LIBCPP_INLINE_VISIBILITY + bool operator()(shared_ptr<_Tp> const& __x, weak_ptr<_Tp> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + _LIBCPP_INLINE_VISIBILITY + bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Tp> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} +}; + +#if _LIBCPP_STD_VER > 14 +template <> +struct _LIBCPP_TEMPLATE_VIS owner_less<void> +{ + template <class _Tp, class _Up> + _LIBCPP_INLINE_VISIBILITY + bool operator()( shared_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + template <class _Tp, class _Up> + _LIBCPP_INLINE_VISIBILITY + bool operator()( shared_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + template <class _Tp, class _Up> + _LIBCPP_INLINE_VISIBILITY + bool operator()( weak_ptr<_Tp> const& __x, shared_ptr<_Up> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + template <class _Tp, class _Up> + _LIBCPP_INLINE_VISIBILITY + bool operator()( weak_ptr<_Tp> const& __x, weak_ptr<_Up> const& __y) const _NOEXCEPT + {return __x.owner_before(__y);} + typedef void is_transparent; +}; +#endif + +template<class _Tp> +class _LIBCPP_TEMPLATE_VIS enable_shared_from_this +{ + mutable weak_ptr<_Tp> __weak_this_; +protected: + _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR + enable_shared_from_this() _NOEXCEPT {} + _LIBCPP_INLINE_VISIBILITY + enable_shared_from_this(enable_shared_from_this const&) _NOEXCEPT {} + _LIBCPP_INLINE_VISIBILITY + enable_shared_from_this& operator=(enable_shared_from_this const&) _NOEXCEPT + {return *this;} + _LIBCPP_INLINE_VISIBILITY + ~enable_shared_from_this() {} +public: + _LIBCPP_INLINE_VISIBILITY + shared_ptr<_Tp> shared_from_this() + {return shared_ptr<_Tp>(__weak_this_);} + _LIBCPP_INLINE_VISIBILITY + shared_ptr<_Tp const> shared_from_this() const + {return shared_ptr<const _Tp>(__weak_this_);} + +#if _LIBCPP_STD_VER > 14 + _LIBCPP_INLINE_VISIBILITY + weak_ptr<_Tp> weak_from_this() _NOEXCEPT + { return __weak_this_; } + + _LIBCPP_INLINE_VISIBILITY + weak_ptr<const _Tp> weak_from_this() const _NOEXCEPT + { return __weak_this_; } +#endif // _LIBCPP_STD_VER > 14 + + template <class _Up> friend class shared_ptr; +}; + +template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; + +template <class _Tp> +struct _LIBCPP_TEMPLATE_VIS hash<shared_ptr<_Tp> > +{ +#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS) + _LIBCPP_DEPRECATED_IN_CXX17 typedef shared_ptr<_Tp> argument_type; + _LIBCPP_DEPRECATED_IN_CXX17 typedef size_t result_type; +#endif + + _LIBCPP_INLINE_VISIBILITY + size_t operator()(const shared_ptr<_Tp>& __ptr) const _NOEXCEPT + { + return hash<typename shared_ptr<_Tp>::element_type*>()(__ptr.get()); + } +}; + +template<class _CharT, class _Traits, class _Yp> +inline _LIBCPP_INLINE_VISIBILITY +basic_ostream<_CharT, _Traits>& +operator<<(basic_ostream<_CharT, _Traits>& __os, shared_ptr<_Yp> const& __p); + + +#if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER) + +class _LIBCPP_TYPE_VIS __sp_mut +{ + void* __lx; +public: + void lock() _NOEXCEPT; + void unlock() _NOEXCEPT; + +private: + _LIBCPP_CONSTEXPR __sp_mut(void*) _NOEXCEPT; + __sp_mut(const __sp_mut&); + __sp_mut& operator=(const __sp_mut&); + + friend _LIBCPP_FUNC_VIS __sp_mut& __get_sp_mut(const void*); +}; + +_LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +__sp_mut& __get_sp_mut(const void*); + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +bool +atomic_is_lock_free(const shared_ptr<_Tp>*) +{ + return false; +} + +template <class _Tp> +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +shared_ptr<_Tp> +atomic_load(const shared_ptr<_Tp>* __p) +{ + __sp_mut& __m = __get_sp_mut(__p); + __m.lock(); + shared_ptr<_Tp> __q = *__p; + __m.unlock(); + return __q; +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +shared_ptr<_Tp> +atomic_load_explicit(const shared_ptr<_Tp>* __p, memory_order) +{ + return atomic_load(__p); +} + +template <class _Tp> +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +void +atomic_store(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) +{ + __sp_mut& __m = __get_sp_mut(__p); + __m.lock(); + __p->swap(__r); + __m.unlock(); +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +void +atomic_store_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r, memory_order) +{ + atomic_store(__p, __r); +} + +template <class _Tp> +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +shared_ptr<_Tp> +atomic_exchange(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) +{ + __sp_mut& __m = __get_sp_mut(__p); + __m.lock(); + __p->swap(__r); + __m.unlock(); + return __r; +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +shared_ptr<_Tp> +atomic_exchange_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r, memory_order) +{ + return atomic_exchange(__p, __r); +} + +template <class _Tp> +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +bool +atomic_compare_exchange_strong(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w) +{ + shared_ptr<_Tp> __temp; + __sp_mut& __m = __get_sp_mut(__p); + __m.lock(); + if (__p->__owner_equivalent(*__v)) + { + _VSTD::swap(__temp, *__p); + *__p = __w; + __m.unlock(); + return true; + } + _VSTD::swap(__temp, *__v); + *__v = *__p; + __m.unlock(); + return false; +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +bool +atomic_compare_exchange_weak(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w) +{ + return atomic_compare_exchange_strong(__p, __v, __w); +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +bool +atomic_compare_exchange_strong_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, + shared_ptr<_Tp> __w, memory_order, memory_order) +{ + return atomic_compare_exchange_strong(__p, __v, __w); +} + +template <class _Tp> +inline _LIBCPP_INLINE_VISIBILITY +_LIBCPP_AVAILABILITY_ATOMIC_SHARED_PTR +bool +atomic_compare_exchange_weak_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, + shared_ptr<_Tp> __w, memory_order, memory_order) +{ + return atomic_compare_exchange_weak(__p, __v, __w); +} + +#endif // !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER) + +_LIBCPP_END_NAMESPACE_STD + +_LIBCPP_POP_MACROS + +#endif // _LIBCPP___MEMORY_SHARED_PTR_H |