libstdc++
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00001 // Allocator traits -*- C++ -*- 00002 00003 // Copyright (C) 2011-2019 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file ext/alloc_traits.h 00026 * This file is a GNU extension to the Standard C++ Library. 00027 */ 00028 00029 #ifndef _EXT_ALLOC_TRAITS_H 00030 #define _EXT_ALLOC_TRAITS_H 1 00031 00032 #pragma GCC system_header 00033 00034 #if __cplusplus >= 201103L 00035 # include <bits/move.h> 00036 # include <bits/alloc_traits.h> 00037 #else 00038 # include <bits/allocator.h> // for __alloc_swap 00039 #endif 00040 00041 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00042 { 00043 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00044 00045 /** 00046 * @brief Uniform interface to C++98 and C++11 allocators. 00047 * @ingroup allocators 00048 */ 00049 template<typename _Alloc, typename = typename _Alloc::value_type> 00050 struct __alloc_traits 00051 #if __cplusplus >= 201103L 00052 : std::allocator_traits<_Alloc> 00053 #endif 00054 { 00055 typedef _Alloc allocator_type; 00056 #if __cplusplus >= 201103L 00057 typedef std::allocator_traits<_Alloc> _Base_type; 00058 typedef typename _Base_type::value_type value_type; 00059 typedef typename _Base_type::pointer pointer; 00060 typedef typename _Base_type::const_pointer const_pointer; 00061 typedef typename _Base_type::size_type size_type; 00062 typedef typename _Base_type::difference_type difference_type; 00063 // C++11 allocators do not define reference or const_reference 00064 typedef value_type& reference; 00065 typedef const value_type& const_reference; 00066 using _Base_type::allocate; 00067 using _Base_type::deallocate; 00068 using _Base_type::construct; 00069 using _Base_type::destroy; 00070 using _Base_type::max_size; 00071 00072 private: 00073 template<typename _Ptr> 00074 using __is_custom_pointer 00075 = std::__and_<std::is_same<pointer, _Ptr>, 00076 std::__not_<std::is_pointer<_Ptr>>>; 00077 00078 public: 00079 // overload construct for non-standard pointer types 00080 template<typename _Ptr, typename... _Args> 00081 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00082 construct(_Alloc& __a, _Ptr __p, _Args&&... __args) 00083 noexcept(noexcept(_Base_type::construct(__a, std::__to_address(__p), 00084 std::forward<_Args>(__args)...))) 00085 { 00086 _Base_type::construct(__a, std::__to_address(__p), 00087 std::forward<_Args>(__args)...); 00088 } 00089 00090 // overload destroy for non-standard pointer types 00091 template<typename _Ptr> 00092 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00093 destroy(_Alloc& __a, _Ptr __p) 00094 noexcept(noexcept(_Base_type::destroy(__a, std::__to_address(__p)))) 00095 { _Base_type::destroy(__a, std::__to_address(__p)); } 00096 00097 static _Alloc _S_select_on_copy(const _Alloc& __a) 00098 { return _Base_type::select_on_container_copy_construction(__a); } 00099 00100 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00101 { std::__alloc_on_swap(__a, __b); } 00102 00103 static constexpr bool _S_propagate_on_copy_assign() 00104 { return _Base_type::propagate_on_container_copy_assignment::value; } 00105 00106 static constexpr bool _S_propagate_on_move_assign() 00107 { return _Base_type::propagate_on_container_move_assignment::value; } 00108 00109 static constexpr bool _S_propagate_on_swap() 00110 { return _Base_type::propagate_on_container_swap::value; } 00111 00112 static constexpr bool _S_always_equal() 00113 { return _Base_type::is_always_equal::value; } 00114 00115 static constexpr bool _S_nothrow_move() 00116 { return _S_propagate_on_move_assign() || _S_always_equal(); } 00117 00118 template<typename _Tp> 00119 struct rebind 00120 { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; 00121 #else 00122 00123 typedef typename _Alloc::pointer pointer; 00124 typedef typename _Alloc::const_pointer const_pointer; 00125 typedef typename _Alloc::value_type value_type; 00126 typedef typename _Alloc::reference reference; 00127 typedef typename _Alloc::const_reference const_reference; 00128 typedef typename _Alloc::size_type size_type; 00129 typedef typename _Alloc::difference_type difference_type; 00130 00131 _GLIBCXX_NODISCARD static pointer 00132 allocate(_Alloc& __a, size_type __n) 00133 { return __a.allocate(__n); } 00134 00135 static void deallocate(_Alloc& __a, pointer __p, size_type __n) 00136 { __a.deallocate(__p, __n); } 00137 00138 template<typename _Tp> 00139 static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) 00140 { __a.construct(__p, __arg); } 00141 00142 static void destroy(_Alloc& __a, pointer __p) 00143 { __a.destroy(__p); } 00144 00145 static size_type max_size(const _Alloc& __a) 00146 { return __a.max_size(); } 00147 00148 static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } 00149 00150 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00151 { 00152 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00153 // 431. Swapping containers with unequal allocators. 00154 std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); 00155 } 00156 00157 template<typename _Tp> 00158 struct rebind 00159 { typedef typename _Alloc::template rebind<_Tp>::other other; }; 00160 #endif 00161 }; 00162 00163 _GLIBCXX_END_NAMESPACE_VERSION 00164 } // namespace __gnu_cxx 00165 00166 #endif