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llvm-project/libcxx/include/__memory/shared_ptr.h
Christopher Di Bella 5aaefa510e [libcxx][modules] protects users from relying on detail headers 
libc++ has started splicing standard library headers into much more
fine-grained content for maintainability. It's very likely that outdated
and naive tooling (some of which is outside of LLVM's scope) will
suggest users include things such as <__ranges/access.h> instead of
<ranges>, and Hyrum's law suggests that users will eventually begin to
rely on this without the help of tooling. As such, this commit
intends to protect users from themselves, by making it a hard error for
anyone outside of the standard library to include libc++ detail headers.

Differential Revision: https://reviews.llvm.org/D106124
2022-02-26 09:00:25 +00:00

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// -*- 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/binary_function.h>
#include <__functional/operations.h>
#include <__functional/reference_wrapper.h>
#include <__memory/addressof.h>
#include <__memory/allocation_guard.h>
#include <__memory/allocator.h>
#include <__memory/allocator_traits.h>
#include <__memory/compressed_pair.h>
#include <__memory/pointer_traits.h>
#include <__memory/unique_ptr.h>
#include <__utility/forward.h>
#include <__utility/move.h>
#include <cstddef>
#include <cstdlib> // abort
#include <iosfwd>
#include <stdexcept>
#include <type_traits>
#include <typeinfo>
#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
# pragma clang include_instead(<memory>)
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Alloc>
class __allocator_destructor
{
typedef _LIBCPP_NODEBUG allocator_traits<_Alloc> __alloc_traits;
public:
typedef _LIBCPP_NODEBUG typename __alloc_traits::pointer pointer;
typedef _LIBCPP_NODEBUG 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_;
public:
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR shared_ptr() _NOEXCEPT
: __ptr_(nullptr),
__cntrl_(nullptr)
{ }
_LIBCPP_HIDE_FROM_ABI
_LIBCPP_CONSTEXPR shared_ptr(nullptr_t) _NOEXCEPT
: __ptr_(nullptr),
__cntrl_(nullptr)
{ }
template<class _Yp, class = __enable_if_t<
_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, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(_Yp* __p, _Dp __d)
: __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 _Yp, class _Dp, class _Alloc, class = __enable_if_t<__shared_ptr_deleter_ctor_reqs<_Dp, _Yp, element_type>::value> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(_Yp* __p, _Dp __d, _Alloc __a)
: __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 _Dp>
_LIBCPP_HIDE_FROM_ABI
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 _Dp, class _Alloc>
_LIBCPP_HIDE_FROM_ABI
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 _Yp>
_LIBCPP_HIDE_FROM_ABI
shared_ptr(const shared_ptr<_Yp>& __r, element_type *__p) _NOEXCEPT
: __ptr_(__p),
__cntrl_(__r.__cntrl_)
{
if (__cntrl_)
__cntrl_->__add_shared();
}
_LIBCPP_HIDE_FROM_ABI
shared_ptr(const shared_ptr& __r) _NOEXCEPT
: __ptr_(__r.__ptr_),
__cntrl_(__r.__cntrl_)
{
if (__cntrl_)
__cntrl_->__add_shared();
}
template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(const shared_ptr<_Yp>& __r) _NOEXCEPT
: __ptr_(__r.__ptr_),
__cntrl_(__r.__cntrl_)
{
if (__cntrl_)
__cntrl_->__add_shared();
}
_LIBCPP_HIDE_FROM_ABI
shared_ptr(shared_ptr&& __r) _NOEXCEPT
: __ptr_(__r.__ptr_),
__cntrl_(__r.__cntrl_)
{
__r.__ptr_ = nullptr;
__r.__cntrl_ = nullptr;
}
template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(shared_ptr<_Yp>&& __r) _NOEXCEPT
: __ptr_(__r.__ptr_),
__cntrl_(__r.__cntrl_)
{
__r.__ptr_ = nullptr;
__r.__cntrl_ = nullptr;
}
template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> >
_LIBCPP_HIDE_FROM_ABI
explicit shared_ptr(const weak_ptr<_Yp>& __r)
: __ptr_(__r.__ptr_),
__cntrl_(__r.__cntrl_ ? __r.__cntrl_->lock() : __r.__cntrl_)
{
if (__cntrl_ == nullptr)
__throw_bad_weak_ptr();
}
#if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR)
template<class _Yp, class = __enable_if_t<is_convertible<_Yp*, element_type*>::value> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(auto_ptr<_Yp>&& __r)
: __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 _Yp, class _Dp, class = __enable_if_t<
!is_lvalue_reference<_Dp>::value &&
is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value
> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(unique_ptr<_Yp, _Dp>&& __r)
: __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 _Yp, class _Dp, class = void, class = __enable_if_t<
is_lvalue_reference<_Dp>::value &&
is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value
> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr(unique_ptr<_Yp, _Dp>&& __r)
: __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();
}
_LIBCPP_HIDE_FROM_ABI
~shared_ptr()
{
if (__cntrl_)
__cntrl_->__release_shared();
}
_LIBCPP_HIDE_FROM_ABI
shared_ptr<_Tp>& operator=(const shared_ptr& __r) _NOEXCEPT
{
shared_ptr(__r).swap(*this);
return *this;
}
template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr<_Tp>& operator=(const shared_ptr<_Yp>& __r) _NOEXCEPT
{
shared_ptr(__r).swap(*this);
return *this;
}
_LIBCPP_HIDE_FROM_ABI
shared_ptr<_Tp>& operator=(shared_ptr&& __r) _NOEXCEPT
{
shared_ptr(_VSTD::move(__r)).swap(*this);
return *this;
}
template<class _Yp, class = __enable_if_t<__compatible_with<_Yp, _Tp>::value> >
_LIBCPP_HIDE_FROM_ABI
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 _Yp, class = __enable_if_t<
!is_array<_Yp>::value &&
is_convertible<_Yp*, typename shared_ptr<_Tp>::element_type*>::value
> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr<_Tp>& operator=(auto_ptr<_Yp>&& __r)
{
shared_ptr(_VSTD::move(__r)).swap(*this);
return *this;
}
#endif
template <class _Yp, class _Dp, class = __enable_if_t<
is_convertible<typename unique_ptr<_Yp, _Dp>::pointer, element_type*>::value
> >
_LIBCPP_HIDE_FROM_ABI
shared_ptr<_Tp>& operator=(unique_ptr<_Yp, _Dp>&& __r)
{
shared_ptr(_VSTD::move(__r)).swap(*this);
return *this;
}
_LIBCPP_HIDE_FROM_ABI
void swap(shared_ptr& __r) _NOEXCEPT
{
_VSTD::swap(__ptr_, __r.__ptr_);
_VSTD::swap(__cntrl_, __r.__cntrl_);
}
_LIBCPP_HIDE_FROM_ABI
void reset() _NOEXCEPT
{
shared_ptr().swap(*this);
}
template<class _Yp, class = __enable_if_t<
__compatible_with<_Yp, _Tp>::value
> >
_LIBCPP_HIDE_FROM_ABI
void reset(_Yp* __p)
{
shared_ptr(__p).swap(*this);
}
template<class _Yp, class _Dp, class = __enable_if_t<
__compatible_with<_Yp, _Tp>::value
> >
_LIBCPP_HIDE_FROM_ABI
void reset(_Yp* __p, _Dp __d)
{
shared_ptr(__p, __d).swap(*this);
}
template<class _Yp, class _Dp, class _Alloc, class = __enable_if_t<
__compatible_with<_Yp, _Tp>::value
> >
_LIBCPP_HIDE_FROM_ABI
void reset(_Yp* __p, _Dp __d, _Alloc __a)
{
shared_ptr(__p, __d, __a).swap(*this);
}
_LIBCPP_HIDE_FROM_ABI
element_type* get() const _NOEXCEPT
{
return __ptr_;
}
_LIBCPP_HIDE_FROM_ABI
typename add_lvalue_reference<element_type>::type operator*() const _NOEXCEPT
{
return *__ptr_;
}
_LIBCPP_HIDE_FROM_ABI
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_HIDE_FROM_ABI
long use_count() const _NOEXCEPT
{
return __cntrl_ ? __cntrl_->use_count() : 0;
}
_LIBCPP_HIDE_FROM_ABI
bool unique() const _NOEXCEPT
{
return use_count() == 1;
}
_LIBCPP_HIDE_FROM_ABI
explicit operator bool() const _NOEXCEPT
{
return get() != nullptr;
}
template <class _Up>
_LIBCPP_HIDE_FROM_ABI
bool owner_before(shared_ptr<_Up> const& __p) const _NOEXCEPT
{
return __cntrl_ < __p.__cntrl_;
}
template <class _Up>
_LIBCPP_HIDE_FROM_ABI
bool owner_before(weak_ptr<_Up> const& __p) const _NOEXCEPT
{
return __cntrl_ < __p.__cntrl_;
}
_LIBCPP_HIDE_FROM_ABI
bool __owner_equivalent(const shared_ptr& __p) const
{
return __cntrl_ == __p.__cntrl_;
}
#if _LIBCPP_STD_VER > 14
_LIBCPP_HIDE_FROM_ABI
typename add_lvalue_reference<element_type>::type 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_HIDE_FROM_ABI
_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>
_LIBCPP_HIDE_FROM_ABI
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, class = __enable_if_t<
is_convertible<_OrigPtr*, const enable_shared_from_this<_Yp>*>::value
> >
_LIBCPP_HIDE_FROM_ABI
void __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_HIDE_FROM_ABI 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;
};
#if _LIBCPP_STD_VER > 14
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
//
// std::allocate_shared and std::make_shared
//
template<class _Tp, class _Alloc, class ..._Args, class = __enable_if_t<!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 = __enable_if_t<!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:
#if _LIBCPP_STD_VER > 14
typedef remove_extent_t<_Tp> element_type;
#else
typedef _Tp element_type;
#endif
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<__compatible_with<_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<__compatible_with<_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<__compatible_with<_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
<
__compatible_with<_Yp, _Tp>::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
<
__compatible_with<_Yp, _Tp>::value,
weak_ptr&
>::type
_LIBCPP_INLINE_VISIBILITY
operator=(weak_ptr<_Yp>&& __r) _NOEXCEPT;
template<class _Yp>
typename enable_if
<
__compatible_with<_Yp, _Tp>::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;
};
#if _LIBCPP_STD_VER > 14
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<__compatible_with<_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<__compatible_with<_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<__compatible_with<_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
<
__compatible_with<_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
<
__compatible_with<_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
<
__compatible_with<_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>
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_THREADS)
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_THREADS)
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___MEMORY_SHARED_PTR_H
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