libstdc++
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00001 // Allocator traits -*- C++ -*- 00002 00003 // Copyright (C) 2011 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 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00035 # include <bits/alloc_traits.h> 00036 #else 00037 # include <bits/allocator.h> // for __alloc_swap 00038 #endif 00039 00040 namespace std _GLIBCXX_VISIBILITY(default) 00041 { 00042 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00043 template<typename> struct allocator; 00044 _GLIBCXX_END_NAMESPACE_VERSION 00045 } // namespace 00046 00047 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00048 { 00049 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00050 00051 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00052 template<typename _Alloc> 00053 struct __allocator_always_compares_equal 00054 { static const bool value = false; }; 00055 00056 template<typename _Tp> 00057 struct __allocator_always_compares_equal<std::allocator<_Tp>> 00058 { static const bool value = true; }; 00059 00060 template<typename, typename> struct array_allocator; 00061 00062 template<typename _Tp, typename _Array> 00063 struct __allocator_always_compares_equal<array_allocator<_Tp, _Array>> 00064 { static const bool value = true; }; 00065 00066 template<typename> struct mt_allocator; 00067 00068 template<typename _Tp> 00069 struct __allocator_always_compares_equal<mt_allocator<_Tp>> 00070 { static const bool value = true; }; 00071 00072 template<typename> struct new_allocator; 00073 00074 template<typename _Tp> 00075 struct __allocator_always_compares_equal<new_allocator<_Tp>> 00076 { static const bool value = true; }; 00077 00078 template<typename> struct pool_allocator; 00079 00080 template<typename _Tp> 00081 struct __allocator_always_compares_equal<pool_allocator<_Tp>> 00082 { static const bool value = true; }; 00083 #endif 00084 00085 /** 00086 * @brief Uniform interface to C++98 and C++0x allocators. 00087 * @ingroup allocators 00088 */ 00089 template<typename _Alloc> 00090 struct __alloc_traits 00091 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00092 : std::allocator_traits<_Alloc> 00093 #endif 00094 { 00095 typedef _Alloc allocator_type; 00096 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00097 typedef std::allocator_traits<_Alloc> _Base_type; 00098 typedef typename _Base_type::value_type value_type; 00099 typedef typename _Base_type::pointer pointer; 00100 typedef typename _Base_type::const_pointer const_pointer; 00101 typedef typename _Base_type::size_type size_type; 00102 // C++0x allocators do not define reference or const_reference 00103 typedef value_type& reference; 00104 typedef const value_type& const_reference; 00105 using _Base_type::allocate; 00106 using _Base_type::deallocate; 00107 using _Base_type::construct; 00108 using _Base_type::destroy; 00109 using _Base_type::max_size; 00110 00111 private: 00112 template<typename _Ptr> 00113 struct __is_custom_pointer 00114 : std::integral_constant<bool, std::is_same<pointer, _Ptr>::value 00115 && !std::is_pointer<_Ptr>::value> 00116 { }; 00117 00118 public: 00119 // overload construct for non-standard pointer types 00120 template<typename _Ptr, typename... _Args> 00121 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00122 construct(_Alloc& __a, _Ptr __p, _Args&&... __args) 00123 { 00124 _Base_type::construct(__a, std::addressof(*__p), 00125 std::forward<_Args>(__args)...); 00126 } 00127 00128 // overload destroy for non-standard pointer types 00129 template<typename _Ptr> 00130 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00131 destroy(_Alloc& __a, _Ptr __p) 00132 { _Base_type::destroy(__a, std::addressof(*__p)); } 00133 00134 static _Alloc _S_select_on_copy(const _Alloc& __a) 00135 { return _Base_type::select_on_container_copy_construction(__a); } 00136 00137 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00138 { std::__alloc_on_swap(__a, __b); } 00139 00140 static constexpr bool _S_propagate_on_copy_assign() 00141 { return _Base_type::propagate_on_container_copy_assignment::value; } 00142 00143 static constexpr bool _S_propagate_on_move_assign() 00144 { return _Base_type::propagate_on_container_move_assignment::value; } 00145 00146 static constexpr bool _S_propagate_on_swap() 00147 { return _Base_type::propagate_on_container_swap::value; } 00148 00149 static constexpr bool _S_always_equal() 00150 { return __allocator_always_compares_equal<_Alloc>::value; } 00151 00152 static constexpr bool _S_nothrow_move() 00153 { return _S_propagate_on_move_assign() || _S_always_equal(); } 00154 00155 static constexpr bool _S_nothrow_swap() 00156 { 00157 using std::swap; 00158 return !_S_propagate_on_swap() 00159 || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>())); 00160 } 00161 00162 template<typename _Tp> 00163 struct rebind 00164 { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; 00165 #else 00166 00167 typedef typename _Alloc::pointer pointer; 00168 typedef typename _Alloc::const_pointer const_pointer; 00169 typedef typename _Alloc::value_type value_type; 00170 typedef typename _Alloc::reference reference; 00171 typedef typename _Alloc::const_reference const_reference; 00172 typedef typename _Alloc::size_type size_type; 00173 00174 static pointer 00175 allocate(_Alloc& __a, size_type __n) 00176 { return __a.allocate(__n); } 00177 00178 static void deallocate(_Alloc& __a, pointer __p, size_type __n) 00179 { __a.deallocate(__p, __n); } 00180 00181 template<typename _Tp> 00182 static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) 00183 { __a.construct(__p, __arg); } 00184 00185 static void destroy(_Alloc& __a, pointer __p) 00186 { __a.destroy(__p); } 00187 00188 static size_type max_size(const _Alloc& __a) 00189 { return __a.max_size(); } 00190 00191 static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } 00192 00193 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00194 { 00195 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00196 // 431. Swapping containers with unequal allocators. 00197 std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); 00198 } 00199 00200 template<typename _Tp> 00201 struct rebind 00202 { typedef typename _Alloc::template rebind<_Tp>::other other; }; 00203 #endif 00204 }; 00205 00206 _GLIBCXX_END_NAMESPACE_VERSION 00207 } // namespace 00208 00209 #endif