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// Experimental shared_ptr with array support -*- C++ -*- |
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|
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// Copyright (C) 2015-2021 Free Software Foundation, Inc. |
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// |
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// This file is part of the GNU ISO C++ Library. This library is free |
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// software; you can redistribute it and/or modify it under the |
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// terms of the GNU General Public License as published by the |
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// Free Software Foundation; either version 3, or (at your option) |
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// any later version. |
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|
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// This library is distributed in the hope that it will be useful, |
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// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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// GNU General Public License for more details. |
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|
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// Under Section 7 of GPL version 3, you are granted additional |
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// permissions described in the GCC Runtime Library Exception, version |
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// 3.1, as published by the Free Software Foundation. |
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|
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// You should have received a copy of the GNU General Public License and |
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// a copy of the GCC Runtime Library Exception along with this program; |
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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// <http://www.gnu.org/licenses/>. |
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|
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/** @file experimental/bits/shared_ptr.h |
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* This is an internal header file, included by other library headers. |
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* Do not attempt to use it directly. @headername{experimental/memory} |
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*/ |
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|
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#ifndef _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H |
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#define _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H 1 |
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|
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#pragma GCC system_header |
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|
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#if __cplusplus >= 201402L |
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|
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#include <memory> |
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#include <experimental/type_traits> |
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|
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namespace std _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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namespace experimental |
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{ |
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inline namespace fundamentals_v2 |
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{ |
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// 8.2.1 |
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|
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template<typename _Tp> class shared_ptr; |
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template<typename _Tp> class weak_ptr; |
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template<typename _Tp> class enable_shared_from_this; |
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|
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template<typename _Yp, typename _Tp> |
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constexpr bool __sp_compatible_v |
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= std::__sp_compatible_with<_Yp*, _Tp*>::value; |
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|
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template<typename _Tp, typename _Yp> |
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constexpr bool __sp_is_constructible_v |
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= std::__sp_is_constructible<_Tp, _Yp>::value; |
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|
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template<typename _Tp> |
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class shared_ptr : public __shared_ptr<_Tp> |
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{ |
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using _Base_type = __shared_ptr<_Tp>; |
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|
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public: |
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using element_type = typename _Base_type::element_type; |
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|
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private: |
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// Constraint for construction from a pointer of type _Yp*: |
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template<typename _Yp> |
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using _SafeConv = enable_if_t<__sp_is_constructible_v<_Tp, _Yp>>; |
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|
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template<typename _Tp1, typename _Res = void> |
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using _Compatible |
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= enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; |
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|
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template<typename _Tp1, typename _Del, |
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typename _Ptr = typename unique_ptr<_Tp1, _Del>::pointer, |
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typename _Res = void> |
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using _UniqCompatible = enable_if_t< |
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__sp_compatible_v<_Tp1, _Tp> |
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&& experimental::is_convertible_v<_Ptr, element_type*>, |
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_Res>; |
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|
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public: |
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|
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// 8.2.1.1, shared_ptr constructors |
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constexpr shared_ptr() noexcept = default; |
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|
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template<typename _Tp1, typename = _SafeConv<_Tp1>> |
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explicit |
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shared_ptr(_Tp1* __p) : _Base_type(__p) |
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{ _M_enable_shared_from_this_with(__p); } |
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|
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template<typename _Tp1, typename _Deleter, typename = _SafeConv<_Tp1>> |
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shared_ptr(_Tp1* __p, _Deleter __d) |
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: _Base_type(__p, __d) |
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{ _M_enable_shared_from_this_with(__p); } |
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|
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template<typename _Tp1, typename _Deleter, typename _Alloc, |
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typename = _SafeConv<_Tp1>> |
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shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a) |
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: _Base_type(__p, __d, __a) |
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{ _M_enable_shared_from_this_with(__p); } |
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|
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template<typename _Deleter> |
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shared_ptr(nullptr_t __p, _Deleter __d) |
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: _Base_type(__p, __d) { } |
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|
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template<typename _Deleter, typename _Alloc> |
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shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a) |
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: _Base_type(__p, __d, __a) { } |
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|
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template<typename _Tp1> |
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shared_ptr(const shared_ptr<_Tp1>& __r, element_type* __p) noexcept |
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: _Base_type(__r, __p) { } |
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|
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shared_ptr(const shared_ptr& __r) noexcept |
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: _Base_type(__r) { } |
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|
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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shared_ptr(const shared_ptr<_Tp1>& __r) noexcept |
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: _Base_type(__r) { } |
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|
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shared_ptr(shared_ptr&& __r) noexcept |
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: _Base_type(std::move(__r)) { } |
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|
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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shared_ptr(shared_ptr<_Tp1>&& __r) noexcept |
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: _Base_type(std::move(__r)) { } |
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|
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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explicit |
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shared_ptr(const weak_ptr<_Tp1>& __r) |
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: _Base_type(__r) { } |
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|
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#if _GLIBCXX_USE_DEPRECATED |
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#pragma GCC diagnostic push |
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations" |
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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shared_ptr(std::auto_ptr<_Tp1>&& __r) |
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: _Base_type(std::move(__r)) |
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{ _M_enable_shared_from_this_with(static_cast<_Tp1*>(this->get())); } |
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#pragma GCC diagnostic pop |
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#endif |
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template<typename _Tp1, typename _Del, |
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typename = _UniqCompatible<_Tp1, _Del>> |
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shared_ptr(unique_ptr<_Tp1, _Del>&& __r) |
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: _Base_type(std::move(__r)) |
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{ |
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// XXX assume conversion from __r.get() to this->get() to __elem_t* |
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// is a round trip, which might not be true in all cases. |
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using __elem_t = typename unique_ptr<_Tp1, _Del>::element_type; |
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_M_enable_shared_from_this_with(static_cast<__elem_t*>(this->get())); |
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} |
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|
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constexpr shared_ptr(nullptr_t __p) |
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: _Base_type(__p) { } |
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|
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// C++14 20.8.2.2 |
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~shared_ptr() = default; |
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|
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// C++14 20.8.2.3 |
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shared_ptr& operator=(const shared_ptr&) noexcept = default; |
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|
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template <typename _Tp1> |
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_Compatible<_Tp1, shared_ptr&> |
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operator=(const shared_ptr<_Tp1>& __r) noexcept |
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{ |
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_Base_type::operator=(__r); |
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return *this; |
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} |
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|
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shared_ptr& |
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operator=(shared_ptr&& __r) noexcept |
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{ |
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_Base_type::operator=(std::move(__r)); |
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return *this; |
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} |
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|
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template <typename _Tp1> |
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_Compatible<_Tp1, shared_ptr&> |
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operator=(shared_ptr<_Tp1>&& __r) noexcept |
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{ |
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_Base_type::operator=(std::move(__r)); |
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return *this; |
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} |
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|
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#if _GLIBCXX_USE_DEPRECATED |
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#pragma GCC diagnostic push |
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations" |
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template<typename _Tp1> |
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_Compatible<_Tp1, shared_ptr&> |
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operator=(std::auto_ptr<_Tp1>&& __r) |
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{ |
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__shared_ptr<_Tp>::operator=(std::move(__r)); |
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return *this; |
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} |
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#pragma GCC diagnostic pop |
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#endif |
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|
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template <typename _Tp1, typename _Del> |
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_UniqCompatible<_Tp1, _Del, shared_ptr&> |
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operator=(unique_ptr<_Tp1, _Del>&& __r) |
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{ |
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_Base_type::operator=(std::move(__r)); |
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return *this; |
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} |
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|
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// C++14 20.8.2.2.4 |
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// swap & reset |
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// 8.2.1.2 shared_ptr observers |
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// in __shared_ptr |
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|
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private: |
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template<typename _Alloc, typename... _Args> |
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shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a, |
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_Args&&... __args) |
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: _Base_type(__tag, __a, std::forward<_Args>(__args)...) |
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{ _M_enable_shared_from_this_with(this->get()); } |
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|
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template<typename _Tp1, typename _Alloc, typename... _Args> |
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friend shared_ptr<_Tp1> |
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allocate_shared(const _Alloc& __a, _Args&&... __args); |
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|
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shared_ptr(const weak_ptr<_Tp>& __r, std::nothrow_t) |
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: _Base_type(__r, std::nothrow) { } |
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|
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friend class weak_ptr<_Tp>; |
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|
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template<typename _Yp> |
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using __esft_base_t = |
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decltype(__expt_enable_shared_from_this_base(std::declval<_Yp*>())); |
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|
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// Detect an accessible and unambiguous enable_shared_from_this base. |
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template<typename _Yp, typename = void> |
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struct __has_esft_base |
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: false_type { }; |
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|
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template<typename _Yp> |
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struct __has_esft_base<_Yp, __void_t<__esft_base_t<_Yp>>> |
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: __bool_constant<!is_array_v<_Tp>> { }; // ignore base for arrays |
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|
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template<typename _Yp> |
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typename enable_if<__has_esft_base<_Yp>::value>::type |
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_M_enable_shared_from_this_with(const _Yp* __p) noexcept |
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{ |
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if (auto __base = __expt_enable_shared_from_this_base(__p)) |
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{ |
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__base->_M_weak_this |
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= shared_ptr<_Yp>(*this, const_cast<_Yp*>(__p)); |
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} |
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} |
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|
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template<typename _Yp> |
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typename enable_if<!__has_esft_base<_Yp>::value>::type |
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_M_enable_shared_from_this_with(const _Yp*) noexcept |
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{ } |
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}; |
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|
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// C++14 20.8.2.2.7 |
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template<typename _Tp1, typename _Tp2> |
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bool operator==(const shared_ptr<_Tp1>& __a, |
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const shared_ptr<_Tp2>& __b) noexcept |
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{ return __a.get() == __b.get(); } |
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|
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template<typename _Tp> |
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inline bool |
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operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept |
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{ return !__a; } |
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|
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template<typename _Tp> |
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inline bool |
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operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept |
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{ return !__a; } |
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|
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template<typename _Tp1, typename _Tp2> |
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inline bool |
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operator!=(const shared_ptr<_Tp1>& __a, |
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const shared_ptr<_Tp2>& __b) noexcept |
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{ return __a.get() != __b.get(); } |
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|
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template<typename _Tp> |
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inline bool |
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operator!=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept |
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{ return (bool)__a; } |
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|
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template<typename _Tp> |
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inline bool |
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operator!=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept |
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{ return (bool)__a; } |
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|
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template<typename _Tp1, typename _Tp2> |
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inline bool |
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operator<(const shared_ptr<_Tp1>& __a, |
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const shared_ptr<_Tp2>& __b) noexcept |
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{ |
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using __elem_t1 = typename shared_ptr<_Tp1>::element_type; |
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using __elem_t2 = typename shared_ptr<_Tp2>::element_type; |
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using _CT = common_type_t<__elem_t1*, __elem_t2*>; |
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return std::less<_CT>()(__a.get(), __b.get()); |
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} |
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|
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template<typename _Tp> |
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inline bool |
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operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return std::less<__elem_t*>()(__a.get(), nullptr); |
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} |
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|
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template<typename _Tp> |
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inline bool |
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operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return std::less<__elem_t*>()(nullptr, __a.get()); |
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} |
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|
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template<typename _Tp1, typename _Tp2> |
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inline bool |
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operator<=(const shared_ptr<_Tp1>& __a, |
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const shared_ptr<_Tp2>& __b) noexcept |
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{ return !(__b < __a); } |
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|
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template<typename _Tp> |
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inline bool |
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operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept |
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{ return !(nullptr < __a); } |
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|
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template<typename _Tp> |
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inline bool |
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operator<=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept |
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{ return !(__a < nullptr); } |
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|
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template<typename _Tp1, typename _Tp2> |
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inline bool |
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operator>(const shared_ptr<_Tp1>& __a, |
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const shared_ptr<_Tp2>& __b) noexcept |
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{ return (__b < __a); } |
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|
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template<typename _Tp> |
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inline bool |
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operator>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return std::less<__elem_t*>()(nullptr, __a.get()); |
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} |
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|
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template<typename _Tp> |
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inline bool |
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operator>(nullptr_t, const shared_ptr<_Tp>& __a) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return std::less<__elem_t*>()(__a.get(), nullptr); |
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} |
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|
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template<typename _Tp1, typename _Tp2> |
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inline bool |
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operator>=(const shared_ptr<_Tp1>& __a, |
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const shared_ptr<_Tp2>& __b) noexcept |
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{ return !(__a < __b); } |
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|
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template<typename _Tp> |
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inline bool |
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operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept |
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{ return !(__a < nullptr); } |
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|
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template<typename _Tp> |
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inline bool |
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operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept |
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{ return !(nullptr < __a); } |
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|
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// C++14 20.8.2.2.8 |
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template<typename _Tp> |
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inline void |
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swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b) noexcept |
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{ __a.swap(__b); } |
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|
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// 8.2.1.3, shared_ptr casts |
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template<typename _Tp, typename _Tp1> |
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inline shared_ptr<_Tp> |
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static_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return shared_ptr<_Tp>(__r, static_cast<__elem_t*>(__r.get())); |
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} |
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|
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template<typename _Tp, typename _Tp1> |
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inline shared_ptr<_Tp> |
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dynamic_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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if (_Tp* __p = dynamic_cast<__elem_t*>(__r.get())) |
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return shared_ptr<_Tp>(__r, __p); |
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return shared_ptr<_Tp>(); |
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} |
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|
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template<typename _Tp, typename _Tp1> |
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inline shared_ptr<_Tp> |
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const_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return shared_ptr<_Tp>(__r, const_cast<__elem_t*>(__r.get())); |
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} |
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|
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template<typename _Tp, typename _Tp1> |
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inline shared_ptr<_Tp> |
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reinterpret_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept |
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{ |
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using __elem_t = typename shared_ptr<_Tp>::element_type; |
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return shared_ptr<_Tp>(__r, reinterpret_cast<__elem_t*>(__r.get())); |
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} |
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|
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// C++14 20.8.2.3 |
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template<typename _Tp> |
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class weak_ptr : public __weak_ptr<_Tp> |
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{ |
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template<typename _Tp1, typename _Res = void> |
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using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; |
| 424 |
|
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using _Base_type = __weak_ptr<_Tp>; |
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|
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public: |
| 428 |
constexpr weak_ptr() noexcept = default; |
| 429 |
|
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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weak_ptr(const shared_ptr<_Tp1>& __r) noexcept |
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: _Base_type(__r) { } |
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|
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weak_ptr(const weak_ptr&) noexcept = default; |
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|
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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weak_ptr(const weak_ptr<_Tp1>& __r) noexcept |
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: _Base_type(__r) { } |
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|
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weak_ptr(weak_ptr&&) noexcept = default; |
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|
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template<typename _Tp1, typename = _Compatible<_Tp1>> |
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weak_ptr(weak_ptr<_Tp1>&& __r) noexcept |
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: _Base_type(std::move(__r)) { } |
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|
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weak_ptr& |
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operator=(const weak_ptr& __r) noexcept = default; |
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|
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template<typename _Tp1> |
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_Compatible<_Tp1, weak_ptr&> |
| 451 |
operator=(const weak_ptr<_Tp1>& __r) noexcept |
| 452 |
{ |
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this->_Base_type::operator=(__r); |
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return *this; |
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} |
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|
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template<typename _Tp1> |
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_Compatible<_Tp1, weak_ptr&> |
| 459 |
operator=(const shared_ptr<_Tp1>& __r) noexcept |
| 460 |
{ |
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this->_Base_type::operator=(__r); |
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return *this; |
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} |
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|
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weak_ptr& |
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operator=(weak_ptr&& __r) noexcept = default; |
| 467 |
|
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template<typename _Tp1> |
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_Compatible<_Tp1, weak_ptr&> |
| 470 |
operator=(weak_ptr<_Tp1>&& __r) noexcept |
| 471 |
{ |
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this->_Base_type::operator=(std::move(__r)); |
| 473 |
return *this; |
| 474 |
} |
| 475 |
|
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shared_ptr<_Tp> |
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lock() const noexcept |
| 478 |
{ return shared_ptr<_Tp>(*this, std::nothrow); } |
| 479 |
|
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friend class enable_shared_from_this<_Tp>; |
| 481 |
}; |
| 482 |
|
| 483 |
// C++14 20.8.2.3.6 |
| 484 |
template<typename _Tp> |
| 485 |
inline void |
| 486 |
swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) noexcept |
| 487 |
{ __a.swap(__b); } |
| 488 |
|
| 489 |
/// C++14 20.8.2.2.10 |
| 490 |
template<typename _Del, typename _Tp> |
| 491 |
inline _Del* |
| 492 |
get_deleter(const shared_ptr<_Tp>& __p) noexcept |
| 493 |
{ return std::get_deleter<_Del>(__p); } |
| 494 |
|
| 495 |
// C++14 20.8.2.2.11 |
| 496 |
template<typename _Ch, typename _Tr, typename _Tp> |
| 497 |
inline std::basic_ostream<_Ch, _Tr>& |
| 498 |
operator<<(std::basic_ostream<_Ch, _Tr>& __os, const shared_ptr<_Tp>& __p) |
| 499 |
{ |
| 500 |
__os << __p.get(); |
| 501 |
return __os; |
| 502 |
} |
| 503 |
|
| 504 |
// C++14 20.8.2.4 |
| 505 |
template<typename _Tp = void> class owner_less; |
| 506 |
|
| 507 |
/// Partial specialization of owner_less for shared_ptr. |
| 508 |
template<typename _Tp> |
| 509 |
struct owner_less<shared_ptr<_Tp>> |
| 510 |
: public _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>> |
| 511 |
{ }; |
| 512 |
|
| 513 |
/// Partial specialization of owner_less for weak_ptr. |
| 514 |
template<typename _Tp> |
| 515 |
struct owner_less<weak_ptr<_Tp>> |
| 516 |
: public _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>> |
| 517 |
{ }; |
| 518 |
|
| 519 |
template<> |
| 520 |
class owner_less<void> |
| 521 |
{ |
| 522 |
template<typename _Tp, typename _Up> |
| 523 |
bool |
| 524 |
operator()(shared_ptr<_Tp> const& __lhs, |
| 525 |
shared_ptr<_Up> const& __rhs) const |
| 526 |
{ return __lhs.owner_before(__rhs); } |
| 527 |
|
| 528 |
template<typename _Tp, typename _Up> |
| 529 |
bool |
| 530 |
operator()(shared_ptr<_Tp> const& __lhs, |
| 531 |
weak_ptr<_Up> const& __rhs) const |
| 532 |
{ return __lhs.owner_before(__rhs); } |
| 533 |
|
| 534 |
template<typename _Tp, typename _Up> |
| 535 |
bool |
| 536 |
operator()(weak_ptr<_Tp> const& __lhs, |
| 537 |
shared_ptr<_Up> const& __rhs) const |
| 538 |
{ return __lhs.owner_before(__rhs); } |
| 539 |
|
| 540 |
template<typename _Tp, typename _Up> |
| 541 |
bool |
| 542 |
operator()(weak_ptr<_Tp> const& __lhs, |
| 543 |
weak_ptr<_Up> const& __rhs) const |
| 544 |
{ return __lhs.owner_before(__rhs); } |
| 545 |
|
| 546 |
typedef void is_transparent; |
| 547 |
}; |
| 548 |
|
| 549 |
// C++14 20.8.2.6 |
| 550 |
template<typename _Tp> |
| 551 |
inline bool |
| 552 |
atomic_is_lock_free(const shared_ptr<_Tp>* __p) |
| 553 |
{ return std::atomic_is_lock_free<_Tp, __default_lock_policy>(__p); } |
| 554 |
|
| 555 |
template<typename _Tp> |
| 556 |
shared_ptr<_Tp> atomic_load(const shared_ptr<_Tp>* __p) |
| 557 |
{ return std::atomic_load<_Tp>(__p); } |
| 558 |
|
| 559 |
template<typename _Tp> |
| 560 |
shared_ptr<_Tp> |
| 561 |
atomic_load_explicit(const shared_ptr<_Tp>* __p, memory_order __mo) |
| 562 |
{ return std::atomic_load_explicit<_Tp>(__p, __mo); } |
| 563 |
|
| 564 |
template<typename _Tp> |
| 565 |
void atomic_store(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) |
| 566 |
{ return std::atomic_store<_Tp>(__p, __r); } |
| 567 |
|
| 568 |
template<typename _Tp> |
| 569 |
shared_ptr<_Tp> |
| 570 |
atomic_store_explicit(const shared_ptr<_Tp>* __p, |
| 571 |
shared_ptr<_Tp> __r, |
| 572 |
memory_order __mo) |
| 573 |
{ return std::atomic_store_explicit<_Tp>(__p, __r, __mo); } |
| 574 |
|
| 575 |
template<typename _Tp> |
| 576 |
void atomic_exchange(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) |
| 577 |
{ return std::atomic_exchange<_Tp>(__p, __r); } |
| 578 |
|
| 579 |
template<typename _Tp> |
| 580 |
shared_ptr<_Tp> |
| 581 |
atomic_exchange_explicit(const shared_ptr<_Tp>* __p, |
| 582 |
shared_ptr<_Tp> __r, |
| 583 |
memory_order __mo) |
| 584 |
{ return std::atomic_exchange_explicit<_Tp>(__p, __r, __mo); } |
| 585 |
|
| 586 |
template<typename _Tp> |
| 587 |
bool atomic_compare_exchange_weak(shared_ptr<_Tp>* __p, |
| 588 |
shared_ptr<_Tp>* __v, |
| 589 |
shared_ptr<_Tp> __w) |
| 590 |
{ return std::atomic_compare_exchange_weak<_Tp>(__p, __v, __w); } |
| 591 |
|
| 592 |
template<typename _Tp> |
| 593 |
bool atomic_compare_exchange_strong(shared_ptr<_Tp>* __p, |
| 594 |
shared_ptr<_Tp>* __v, |
| 595 |
shared_ptr<_Tp> __w) |
| 596 |
{ return std::atomic_compare_exchange_strong<_Tp>(__p, __v, __w); } |
| 597 |
|
| 598 |
template<typename _Tp> |
| 599 |
bool atomic_compare_exchange_weak_explicit(shared_ptr<_Tp>* __p, |
| 600 |
shared_ptr<_Tp>* __v, |
| 601 |
shared_ptr<_Tp> __w, |
| 602 |
memory_order __success, |
| 603 |
memory_order __failure) |
| 604 |
{ return std::atomic_compare_exchange_weak_explicit<_Tp>(__p, __v, __w, |
| 605 |
__success, |
| 606 |
__failure); } |
| 607 |
|
| 608 |
template<typename _Tp> |
| 609 |
bool atomic_compare_exchange_strong_explicit(shared_ptr<_Tp>* __p, |
| 610 |
shared_ptr<_Tp>* __v, |
| 611 |
shared_ptr<_Tp> __w, |
| 612 |
memory_order __success, |
| 613 |
memory_order __failure) |
| 614 |
{ return std::atomic_compare_exchange_strong_explicit<_Tp>(__p, __v, __w, |
| 615 |
__success, |
| 616 |
__failure); } |
| 617 |
|
| 618 |
//enable_shared_from_this |
| 619 |
template<typename _Tp> |
| 620 |
class enable_shared_from_this |
| 621 |
{ |
| 622 |
protected: |
| 623 |
constexpr enable_shared_from_this() noexcept { } |
| 624 |
|
| 625 |
enable_shared_from_this(const enable_shared_from_this&) noexcept { } |
| 626 |
|
| 627 |
enable_shared_from_this& |
| 628 |
operator=(const enable_shared_from_this&) noexcept |
| 629 |
{ return *this; } |
| 630 |
|
| 631 |
~enable_shared_from_this() { } |
| 632 |
|
| 633 |
public: |
| 634 |
shared_ptr<_Tp> |
| 635 |
shared_from_this() |
| 636 |
{ return shared_ptr<_Tp>(this->_M_weak_this); } |
| 637 |
|
| 638 |
shared_ptr<const _Tp> |
| 639 |
shared_from_this() const |
| 640 |
{ return shared_ptr<const _Tp>(this->_M_weak_this); } |
| 641 |
|
| 642 |
weak_ptr<_Tp> |
| 643 |
weak_from_this() noexcept |
| 644 |
{ return _M_weak_this; } |
| 645 |
|
| 646 |
weak_ptr<const _Tp> |
| 647 |
weak_from_this() const noexcept |
| 648 |
{ return _M_weak_this; } |
| 649 |
|
| 650 |
private: |
| 651 |
template<typename _Tp1> |
| 652 |
void |
| 653 |
_M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const noexcept |
| 654 |
{ _M_weak_this._M_assign(__p, __n); } |
| 655 |
|
| 656 |
// Found by ADL when this is an associated class. |
| 657 |
friend const enable_shared_from_this* |
| 658 |
__expt_enable_shared_from_this_base(const enable_shared_from_this* __p) |
| 659 |
{ return __p; } |
| 660 |
|
| 661 |
template<typename> |
| 662 |
friend class shared_ptr; |
| 663 |
|
| 664 |
mutable weak_ptr<_Tp> _M_weak_this; |
| 665 |
}; |
| 666 |
} // namespace fundamentals_v2 |
| 667 |
} // namespace experimental |
| 668 |
|
| 669 |
/// std::hash specialization for shared_ptr. |
| 670 |
template<typename _Tp> |
| 671 |
struct hash<experimental::shared_ptr<_Tp>> |
| 672 |
: public __hash_base<size_t, experimental::shared_ptr<_Tp>> |
| 673 |
{ |
| 674 |
size_t |
| 675 |
operator()(const experimental::shared_ptr<_Tp>& __s) const noexcept |
| 676 |
{ return std::hash<_Tp*>()(__s.get()); } |
| 677 |
}; |
| 678 |
|
| 679 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 680 |
} // namespace std |
| 681 |
|
| 682 |
#endif // __cplusplus <= 201103L |
| 683 |
|
| 684 |
#endif // _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H |
