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// Allocator traits -*- C++ -*- |
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// Copyright (C) 2011-2021 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 ext/alloc_traits.h |
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* This file is a GNU extension to the Standard C++ Library. |
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*/ |
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|
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#ifndef _EXT_ALLOC_TRAITS_H |
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#define _EXT_ALLOC_TRAITS_H 1 |
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|
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#pragma GCC system_header |
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|
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# include <bits/alloc_traits.h> |
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#if __cplusplus < 201103L |
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# include <bits/allocator.h> // for __alloc_swap |
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#endif |
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|
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) |
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{ |
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_GLIBCXX_BEGIN_NAMESPACE_VERSION |
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|
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/** |
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* @brief Uniform interface to C++98 and C++11 allocators. |
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* @ingroup allocators |
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*/ |
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template<typename _Alloc, typename = typename _Alloc::value_type> |
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struct __alloc_traits |
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#if __cplusplus >= 201103L |
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: std::allocator_traits<_Alloc> |
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#endif |
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{ |
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typedef _Alloc allocator_type; |
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#if __cplusplus >= 201103L |
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typedef std::allocator_traits<_Alloc> _Base_type; |
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typedef typename _Base_type::value_type value_type; |
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typedef typename _Base_type::pointer pointer; |
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typedef typename _Base_type::const_pointer const_pointer; |
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typedef typename _Base_type::size_type size_type; |
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typedef typename _Base_type::difference_type difference_type; |
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// C++11 allocators do not define reference or const_reference |
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typedef value_type& reference; |
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typedef const value_type& const_reference; |
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using _Base_type::allocate; |
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using _Base_type::deallocate; |
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using _Base_type::construct; |
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using _Base_type::destroy; |
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using _Base_type::max_size; |
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|
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private: |
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template<typename _Ptr> |
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using __is_custom_pointer |
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= std::__and_<std::is_same<pointer, _Ptr>, |
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std::__not_<std::is_pointer<_Ptr>>>; |
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|
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public: |
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// overload construct for non-standard pointer types |
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template<typename _Ptr, typename... _Args> |
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static _GLIBCXX14_CONSTEXPR |
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std::__enable_if_t<__is_custom_pointer<_Ptr>::value> |
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construct(_Alloc& __a, _Ptr __p, _Args&&... __args) |
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noexcept(noexcept(_Base_type::construct(__a, std::__to_address(__p), |
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std::forward<_Args>(__args)...))) |
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{ |
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_Base_type::construct(__a, std::__to_address(__p), |
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std::forward<_Args>(__args)...); |
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} |
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|
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// overload destroy for non-standard pointer types |
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template<typename _Ptr> |
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static _GLIBCXX14_CONSTEXPR |
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std::__enable_if_t<__is_custom_pointer<_Ptr>::value> |
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destroy(_Alloc& __a, _Ptr __p) |
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noexcept(noexcept(_Base_type::destroy(__a, std::__to_address(__p)))) |
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{ _Base_type::destroy(__a, std::__to_address(__p)); } |
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|
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static constexpr _Alloc _S_select_on_copy(const _Alloc& __a) |
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{ return _Base_type::select_on_container_copy_construction(__a); } |
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|
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static _GLIBCXX14_CONSTEXPR void _S_on_swap(_Alloc& __a, _Alloc& __b) |
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{ std::__alloc_on_swap(__a, __b); } |
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static constexpr bool _S_propagate_on_copy_assign() |
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{ return _Base_type::propagate_on_container_copy_assignment::value; } |
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static constexpr bool _S_propagate_on_move_assign() |
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{ return _Base_type::propagate_on_container_move_assignment::value; } |
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|
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static constexpr bool _S_propagate_on_swap() |
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{ return _Base_type::propagate_on_container_swap::value; } |
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static constexpr bool _S_always_equal() |
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{ return _Base_type::is_always_equal::value; } |
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static constexpr bool _S_nothrow_move() |
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{ return _S_propagate_on_move_assign() || _S_always_equal(); } |
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|
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template<typename _Tp> |
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struct rebind |
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{ typedef typename _Base_type::template rebind_alloc<_Tp> other; }; |
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#else // ! C++11 |
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|
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typedef typename _Alloc::pointer pointer; |
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typedef typename _Alloc::const_pointer const_pointer; |
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typedef typename _Alloc::value_type value_type; |
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typedef typename _Alloc::reference reference; |
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typedef typename _Alloc::const_reference const_reference; |
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typedef typename _Alloc::size_type size_type; |
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typedef typename _Alloc::difference_type difference_type; |
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|
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_GLIBCXX_NODISCARD static pointer |
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allocate(_Alloc& __a, size_type __n) |
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{ return __a.allocate(__n); } |
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|
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template<typename _Hint> |
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_GLIBCXX_NODISCARD static pointer |
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allocate(_Alloc& __a, size_type __n, _Hint __hint) |
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{ return __a.allocate(__n, __hint); } |
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|
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static void deallocate(_Alloc& __a, pointer __p, size_type __n) |
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{ __a.deallocate(__p, __n); } |
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template<typename _Tp> |
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static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) |
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{ __a.construct(__p, __arg); } |
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static void destroy(_Alloc& __a, pointer __p) |
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{ __a.destroy(__p); } |
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static size_type max_size(const _Alloc& __a) |
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{ return __a.max_size(); } |
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static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } |
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static void _S_on_swap(_Alloc& __a, _Alloc& __b) |
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{ |
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// _GLIBCXX_RESOLVE_LIB_DEFECTS |
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// 431. Swapping containers with unequal allocators. |
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std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); |
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} |
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template<typename _Tp> |
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struct rebind |
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{ typedef typename _Alloc::template rebind<_Tp>::other other; }; |
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#endif // C++11 |
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}; |
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|
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace __gnu_cxx |
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|
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#endif |
