Edit File: alloc_traits.h
// Allocator traits -*- C++ -*- // Copyright (C) 2011-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file ext/alloc_traits.h * This file is a GNU extension to the Standard C++ Library. */ #ifndef _EXT_ALLOC_TRAITS_H #define _EXT_ALLOC_TRAITS_H 1 #pragma GCC system_header #if __cplusplus >= 201103L # include <bits/move.h> # include <bits/alloc_traits.h> #else # include <bits/allocator.h> // for __alloc_swap #endif namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @brief Uniform interface to C++98 and C++11 allocators. * @ingroup allocators */ template<typename _Alloc, typename = typename _Alloc::value_type> struct __alloc_traits #if __cplusplus >= 201103L : std::allocator_traits<_Alloc> #endif { typedef _Alloc allocator_type; #if __cplusplus >= 201103L typedef std::allocator_traits<_Alloc> _Base_type; typedef typename _Base_type::value_type value_type; typedef typename _Base_type::pointer pointer; typedef typename _Base_type::const_pointer const_pointer; typedef typename _Base_type::size_type size_type; typedef typename _Base_type::difference_type difference_type; // C++11 allocators do not define reference or const_reference typedef value_type& reference; typedef const value_type& const_reference; using _Base_type::allocate; using _Base_type::deallocate; using _Base_type::construct; using _Base_type::destroy; using _Base_type::max_size; private: template<typename _Ptr> using __is_custom_pointer = std::__and_<std::is_same<pointer, _Ptr>, std::__not_<std::is_pointer<_Ptr>>>; public: // overload construct for non-standard pointer types template<typename _Ptr, typename... _Args> static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type construct(_Alloc& __a, _Ptr __p, _Args&&... __args) { _Base_type::construct(__a, std::__to_address(__p), std::forward<_Args>(__args)...); } // overload destroy for non-standard pointer types template<typename _Ptr> static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type destroy(_Alloc& __a, _Ptr __p) { _Base_type::destroy(__a, std::__to_address(__p)); } static _Alloc _S_select_on_copy(const _Alloc& __a) { return _Base_type::select_on_container_copy_construction(__a); } static void _S_on_swap(_Alloc& __a, _Alloc& __b) { std::__alloc_on_swap(__a, __b); } static constexpr bool _S_propagate_on_copy_assign() { return _Base_type::propagate_on_container_copy_assignment::value; } static constexpr bool _S_propagate_on_move_assign() { return _Base_type::propagate_on_container_move_assignment::value; } static constexpr bool _S_propagate_on_swap() { return _Base_type::propagate_on_container_swap::value; } static constexpr bool _S_always_equal() { return _Base_type::is_always_equal::value; } static constexpr bool _S_nothrow_move() { return _S_propagate_on_move_assign() || _S_always_equal(); } template<typename _Tp> struct rebind { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; #else typedef typename _Alloc::pointer pointer; typedef typename _Alloc::const_pointer const_pointer; typedef typename _Alloc::value_type value_type; typedef typename _Alloc::reference reference; typedef typename _Alloc::const_reference const_reference; typedef typename _Alloc::size_type size_type; typedef typename _Alloc::difference_type difference_type; static pointer allocate(_Alloc& __a, size_type __n) { return __a.allocate(__n); } static void deallocate(_Alloc& __a, pointer __p, size_type __n) { __a.deallocate(__p, __n); } template<typename _Tp> static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) { __a.construct(__p, __arg); } static void destroy(_Alloc& __a, pointer __p) { __a.destroy(__p); } static size_type max_size(const _Alloc& __a) { return __a.max_size(); } static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } static void _S_on_swap(_Alloc& __a, _Alloc& __b) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 431. Swapping containers with unequal allocators. std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); } template<typename _Tp> struct rebind { typedef typename _Alloc::template rebind<_Tp>::other other; }; #endif }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace __gnu_cxx #endif
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