85ec4feb11
From-SVN: r256169
679 lines
20 KiB
C++
679 lines
20 KiB
C++
// Experimental shared_ptr with array support -*- C++ -*-
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// Copyright (C) 2015-2018 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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// 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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// 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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// 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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/** @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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#ifndef _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H
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#define _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H 1
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#pragma GCC system_header
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#if __cplusplus >= 201402L
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#include <memory>
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#include <experimental/type_traits>
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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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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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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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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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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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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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public:
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using element_type = typename _Base_type::element_type;
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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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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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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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public:
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// 8.2.1.1, shared_ptr constructors
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constexpr shared_ptr() noexcept = default;
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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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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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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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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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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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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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shared_ptr(const shared_ptr& __r) noexcept
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: _Base_type(__r) { }
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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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shared_ptr(shared_ptr&& __r) noexcept
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: _Base_type(std::move(__r)) { }
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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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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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#if _GLIBCXX_USE_DEPRECATED
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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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#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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constexpr shared_ptr(nullptr_t __p)
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: _Base_type(__p) { }
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// C++14 §20.8.2.2
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~shared_ptr() = default;
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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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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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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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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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#if _GLIBCXX_USE_DEPRECATED
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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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#endif
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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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// 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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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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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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shared_ptr(const weak_ptr<_Tp>& __r, std::nothrow_t)
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: _Base_type(__r, std::nothrow) { }
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friend class weak_ptr<_Tp>;
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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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// 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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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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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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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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// C++14 §20.8.2.2.7 //DOING
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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// 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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// 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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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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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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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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// 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>;
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using _Base_type = __weak_ptr<_Tp>;
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public:
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constexpr weak_ptr() noexcept = default;
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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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weak_ptr(const weak_ptr&) noexcept = default;
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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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weak_ptr(weak_ptr&&) noexcept = default;
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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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weak_ptr&
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operator=(const weak_ptr& __r) noexcept = default;
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template<typename _Tp1>
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_Compatible<_Tp1, weak_ptr&>
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operator=(const weak_ptr<_Tp1>& __r) noexcept
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{
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this->_Base_type::operator=(__r);
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return *this;
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}
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template<typename _Tp1>
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_Compatible<_Tp1, weak_ptr&>
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operator=(const shared_ptr<_Tp1>& __r) noexcept
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{
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this->_Base_type::operator=(__r);
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return *this;
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}
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weak_ptr&
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operator=(weak_ptr&& __r) noexcept = default;
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template<typename _Tp1>
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_Compatible<_Tp1, weak_ptr&>
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operator=(weak_ptr<_Tp1>&& __r) noexcept
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{
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this->_Base_type::operator=(std::move(__r));
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return *this;
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}
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shared_ptr<_Tp>
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lock() const noexcept
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{ return shared_ptr<_Tp>(*this, std::nothrow); }
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friend class enable_shared_from_this<_Tp>;
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};
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// C++14 §20.8.2.3.6
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template<typename _Tp>
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inline void
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swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) noexcept
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{ __a.swap(__b); }
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/// C++14 §20.8.2.2.10
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template<typename _Del, typename _Tp>
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inline _Del*
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get_deleter(const shared_ptr<_Tp>& __p) noexcept
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{ return std::get_deleter<_Del>(__p); }
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// C++14 §20.8.2.2.11
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template<typename _Ch, typename _Tr, typename _Tp>
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inline std::basic_ostream<_Ch, _Tr>&
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operator<<(std::basic_ostream<_Ch, _Tr>& __os, const shared_ptr<_Tp>& __p)
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{
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__os << __p.get();
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|
return __os;
|
|
}
|
|
|
|
// C++14 §20.8.2.4
|
|
template<typename _Tp = void> class owner_less;
|
|
|
|
/// Partial specialization of owner_less for shared_ptr.
|
|
template<typename _Tp>
|
|
struct owner_less<shared_ptr<_Tp>>
|
|
: public _Sp_owner_less<shared_ptr<_Tp>, weak_ptr<_Tp>>
|
|
{ };
|
|
|
|
/// Partial specialization of owner_less for weak_ptr.
|
|
template<typename _Tp>
|
|
struct owner_less<weak_ptr<_Tp>>
|
|
: public _Sp_owner_less<weak_ptr<_Tp>, shared_ptr<_Tp>>
|
|
{ };
|
|
|
|
template<>
|
|
class owner_less<void>
|
|
{
|
|
template<typename _Tp, typename _Up>
|
|
bool
|
|
operator()(shared_ptr<_Tp> const& __lhs,
|
|
shared_ptr<_Up> const& __rhs) const
|
|
{ return __lhs.owner_before(__rhs); }
|
|
|
|
template<typename _Tp, typename _Up>
|
|
bool
|
|
operator()(shared_ptr<_Tp> const& __lhs,
|
|
weak_ptr<_Up> const& __rhs) const
|
|
{ return __lhs.owner_before(__rhs); }
|
|
|
|
template<typename _Tp, typename _Up>
|
|
bool
|
|
operator()(weak_ptr<_Tp> const& __lhs,
|
|
shared_ptr<_Up> const& __rhs) const
|
|
{ return __lhs.owner_before(__rhs); }
|
|
|
|
template<typename _Tp, typename _Up>
|
|
bool
|
|
operator()(weak_ptr<_Tp> const& __lhs,
|
|
weak_ptr<_Up> const& __rhs) const
|
|
{ return __lhs.owner_before(__rhs); }
|
|
|
|
typedef void is_transparent;
|
|
};
|
|
|
|
// C++14 §20.8.2.6
|
|
template<typename _Tp>
|
|
inline bool
|
|
atomic_is_lock_free(const shared_ptr<_Tp>* __p)
|
|
{ return std::atomic_is_lock_free<_Tp, __default_lock_policy>(__p); }
|
|
|
|
template<typename _Tp>
|
|
shared_ptr<_Tp> atomic_load(const shared_ptr<_Tp>* __p)
|
|
{ return std::atomic_load<_Tp>(__p); }
|
|
|
|
template<typename _Tp>
|
|
shared_ptr<_Tp>
|
|
atomic_load_explicit(const shared_ptr<_Tp>* __p, memory_order __mo)
|
|
{ return std::atomic_load_explicit<_Tp>(__p, __mo); }
|
|
|
|
template<typename _Tp>
|
|
void atomic_store(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r)
|
|
{ return std::atomic_store<_Tp>(__p, __r); }
|
|
|
|
template<typename _Tp>
|
|
shared_ptr<_Tp>
|
|
atomic_store_explicit(const shared_ptr<_Tp>* __p,
|
|
shared_ptr<_Tp> __r,
|
|
memory_order __mo)
|
|
{ return std::atomic_store_explicit<_Tp>(__p, __r, __mo); }
|
|
|
|
template<typename _Tp>
|
|
void atomic_exchange(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r)
|
|
{ return std::atomic_exchange<_Tp>(__p, __r); }
|
|
|
|
template<typename _Tp>
|
|
shared_ptr<_Tp>
|
|
atomic_exchange_explicit(const shared_ptr<_Tp>* __p,
|
|
shared_ptr<_Tp> __r,
|
|
memory_order __mo)
|
|
{ return std::atomic_exchange_explicit<_Tp>(__p, __r, __mo); }
|
|
|
|
template<typename _Tp>
|
|
bool atomic_compare_exchange_weak(shared_ptr<_Tp>* __p,
|
|
shared_ptr<_Tp>* __v,
|
|
shared_ptr<_Tp> __w)
|
|
{ return std::atomic_compare_exchange_weak<_Tp>(__p, __v, __w); }
|
|
|
|
template<typename _Tp>
|
|
bool atomic_compare_exchange_strong(shared_ptr<_Tp>* __p,
|
|
shared_ptr<_Tp>* __v,
|
|
shared_ptr<_Tp> __w)
|
|
{ return std::atomic_compare_exchange_strong<_Tp>(__p, __v, __w); }
|
|
|
|
template<typename _Tp>
|
|
bool atomic_compare_exchange_weak_explicit(shared_ptr<_Tp>* __p,
|
|
shared_ptr<_Tp>* __v,
|
|
shared_ptr<_Tp> __w,
|
|
memory_order __success,
|
|
memory_order __failure)
|
|
{ return std::atomic_compare_exchange_weak_explicit<_Tp>(__p, __v, __w,
|
|
__success,
|
|
__failure); }
|
|
|
|
template<typename _Tp>
|
|
bool atomic_compare_exchange_strong_explicit(shared_ptr<_Tp>* __p,
|
|
shared_ptr<_Tp>* __v,
|
|
shared_ptr<_Tp> __w,
|
|
memory_order __success,
|
|
memory_order __failure)
|
|
{ return std::atomic_compare_exchange_strong_explicit<_Tp>(__p, __v, __w,
|
|
__success,
|
|
__failure); }
|
|
|
|
//enable_shared_from_this
|
|
template<typename _Tp>
|
|
class enable_shared_from_this
|
|
{
|
|
protected:
|
|
constexpr enable_shared_from_this() noexcept { }
|
|
|
|
enable_shared_from_this(const enable_shared_from_this&) noexcept { }
|
|
|
|
enable_shared_from_this&
|
|
operator=(const enable_shared_from_this&) noexcept
|
|
{ return *this; }
|
|
|
|
~enable_shared_from_this() { }
|
|
|
|
public:
|
|
shared_ptr<_Tp>
|
|
shared_from_this()
|
|
{ return shared_ptr<_Tp>(this->_M_weak_this); }
|
|
|
|
shared_ptr<const _Tp>
|
|
shared_from_this() const
|
|
{ return shared_ptr<const _Tp>(this->_M_weak_this); }
|
|
|
|
weak_ptr<_Tp>
|
|
weak_from_this() noexcept
|
|
{ return _M_weak_this; }
|
|
|
|
weak_ptr<const _Tp>
|
|
weak_from_this() const noexcept
|
|
{ return _M_weak_this; }
|
|
|
|
private:
|
|
template<typename _Tp1>
|
|
void
|
|
_M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const noexcept
|
|
{ _M_weak_this._M_assign(__p, __n); }
|
|
|
|
// Found by ADL when this is an associated class.
|
|
friend const enable_shared_from_this*
|
|
__expt_enable_shared_from_this_base(const enable_shared_from_this* __p)
|
|
{ return __p; }
|
|
|
|
template<typename>
|
|
friend class shared_ptr;
|
|
|
|
mutable weak_ptr<_Tp> _M_weak_this;
|
|
};
|
|
} // namespace fundamentals_v2
|
|
} // namespace experimental
|
|
|
|
/// std::hash specialization for shared_ptr.
|
|
template<typename _Tp>
|
|
struct hash<experimental::shared_ptr<_Tp>>
|
|
: public __hash_base<size_t, experimental::shared_ptr<_Tp>>
|
|
{
|
|
size_t
|
|
operator()(const experimental::shared_ptr<_Tp>& __s) const noexcept
|
|
{ return std::hash<_Tp*>()(__s.get()); }
|
|
};
|
|
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
|
|
#endif // __cplusplus <= 201103L
|
|
|
|
#endif // _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H
|