libstdc++
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00001 // Allocator traits -*- C++ -*- 00002 00003 // Copyright (C) 2011-2013 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 #if __cplusplus >= 201103L 00046 template<typename _Alloc> 00047 struct __allocator_always_compares_equal 00048 { static const bool value = false; }; 00049 00050 template<typename _Alloc> 00051 const bool __allocator_always_compares_equal<_Alloc>::value; 00052 00053 template<typename _Tp> 00054 struct __allocator_always_compares_equal<std::allocator<_Tp>> 00055 { static const bool value = true; }; 00056 00057 template<typename _Tp> 00058 const bool __allocator_always_compares_equal<std::allocator<_Tp>>::value; 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 _Tp, typename _Array> 00067 const bool 00068 __allocator_always_compares_equal<array_allocator<_Tp, _Array>>::value; 00069 00070 template<typename> struct bitmap_allocator; 00071 00072 template<typename _Tp> 00073 struct __allocator_always_compares_equal<bitmap_allocator<_Tp>> 00074 { static const bool value = true; }; 00075 00076 template<typename _Tp> 00077 const bool __allocator_always_compares_equal<bitmap_allocator<_Tp>>::value; 00078 00079 template<typename> struct malloc_allocator; 00080 00081 template<typename _Tp> 00082 struct __allocator_always_compares_equal<malloc_allocator<_Tp>> 00083 { static const bool value = true; }; 00084 00085 template<typename _Tp> 00086 const bool __allocator_always_compares_equal<malloc_allocator<_Tp>>::value; 00087 00088 template<typename> struct mt_allocator; 00089 00090 template<typename _Tp> 00091 struct __allocator_always_compares_equal<mt_allocator<_Tp>> 00092 { static const bool value = true; }; 00093 00094 template<typename _Tp> 00095 const bool __allocator_always_compares_equal<mt_allocator<_Tp>>::value; 00096 00097 template<typename> struct new_allocator; 00098 00099 template<typename _Tp> 00100 struct __allocator_always_compares_equal<new_allocator<_Tp>> 00101 { static const bool value = true; }; 00102 00103 template<typename _Tp> 00104 const bool __allocator_always_compares_equal<new_allocator<_Tp>>::value; 00105 00106 template<typename> struct pool_allocator; 00107 00108 template<typename _Tp> 00109 struct __allocator_always_compares_equal<pool_allocator<_Tp>> 00110 { static const bool value = true; }; 00111 00112 template<typename _Tp> 00113 const bool __allocator_always_compares_equal<pool_allocator<_Tp>>::value; 00114 #endif 00115 00116 /** 00117 * @brief Uniform interface to C++98 and C++0x allocators. 00118 * @ingroup allocators 00119 */ 00120 template<typename _Alloc> 00121 struct __alloc_traits 00122 #if __cplusplus >= 201103L 00123 : std::allocator_traits<_Alloc> 00124 #endif 00125 { 00126 typedef _Alloc allocator_type; 00127 #if __cplusplus >= 201103L 00128 typedef std::allocator_traits<_Alloc> _Base_type; 00129 typedef typename _Base_type::value_type value_type; 00130 typedef typename _Base_type::pointer pointer; 00131 typedef typename _Base_type::const_pointer const_pointer; 00132 typedef typename _Base_type::size_type size_type; 00133 typedef typename _Base_type::difference_type difference_type; 00134 // C++0x allocators do not define reference or const_reference 00135 typedef value_type& reference; 00136 typedef const value_type& const_reference; 00137 using _Base_type::allocate; 00138 using _Base_type::deallocate; 00139 using _Base_type::construct; 00140 using _Base_type::destroy; 00141 using _Base_type::max_size; 00142 00143 private: 00144 template<typename _Ptr> 00145 struct __is_custom_pointer 00146 : std::integral_constant<bool, std::is_same<pointer, _Ptr>::value 00147 && !std::is_pointer<_Ptr>::value> 00148 { }; 00149 00150 public: 00151 // overload construct for non-standard pointer types 00152 template<typename _Ptr, typename... _Args> 00153 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00154 construct(_Alloc& __a, _Ptr __p, _Args&&... __args) 00155 { 00156 _Base_type::construct(__a, std::addressof(*__p), 00157 std::forward<_Args>(__args)...); 00158 } 00159 00160 // overload destroy for non-standard pointer types 00161 template<typename _Ptr> 00162 static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type 00163 destroy(_Alloc& __a, _Ptr __p) 00164 { _Base_type::destroy(__a, std::addressof(*__p)); } 00165 00166 static _Alloc _S_select_on_copy(const _Alloc& __a) 00167 { return _Base_type::select_on_container_copy_construction(__a); } 00168 00169 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00170 { std::__alloc_on_swap(__a, __b); } 00171 00172 static constexpr bool _S_propagate_on_copy_assign() 00173 { return _Base_type::propagate_on_container_copy_assignment::value; } 00174 00175 static constexpr bool _S_propagate_on_move_assign() 00176 { return _Base_type::propagate_on_container_move_assignment::value; } 00177 00178 static constexpr bool _S_propagate_on_swap() 00179 { return _Base_type::propagate_on_container_swap::value; } 00180 00181 static constexpr bool _S_always_equal() 00182 { return __allocator_always_compares_equal<_Alloc>::value; } 00183 00184 static constexpr bool _S_nothrow_move() 00185 { return _S_propagate_on_move_assign() || _S_always_equal(); } 00186 00187 static constexpr bool _S_nothrow_swap() 00188 { 00189 using std::swap; 00190 return !_S_propagate_on_swap() 00191 || noexcept(swap(std::declval<_Alloc&>(), std::declval<_Alloc&>())); 00192 } 00193 00194 template<typename _Tp> 00195 struct rebind 00196 { typedef typename _Base_type::template rebind_alloc<_Tp> other; }; 00197 #else 00198 00199 typedef typename _Alloc::pointer pointer; 00200 typedef typename _Alloc::const_pointer const_pointer; 00201 typedef typename _Alloc::value_type value_type; 00202 typedef typename _Alloc::reference reference; 00203 typedef typename _Alloc::const_reference const_reference; 00204 typedef typename _Alloc::size_type size_type; 00205 typedef typename _Alloc::difference_type difference_type; 00206 00207 static pointer 00208 allocate(_Alloc& __a, size_type __n) 00209 { return __a.allocate(__n); } 00210 00211 static void deallocate(_Alloc& __a, pointer __p, size_type __n) 00212 { __a.deallocate(__p, __n); } 00213 00214 template<typename _Tp> 00215 static void construct(_Alloc& __a, pointer __p, const _Tp& __arg) 00216 { __a.construct(__p, __arg); } 00217 00218 static void destroy(_Alloc& __a, pointer __p) 00219 { __a.destroy(__p); } 00220 00221 static size_type max_size(const _Alloc& __a) 00222 { return __a.max_size(); } 00223 00224 static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; } 00225 00226 static void _S_on_swap(_Alloc& __a, _Alloc& __b) 00227 { 00228 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00229 // 431. Swapping containers with unequal allocators. 00230 std::__alloc_swap<_Alloc>::_S_do_it(__a, __b); 00231 } 00232 00233 template<typename _Tp> 00234 struct rebind 00235 { typedef typename _Alloc::template rebind<_Tp>::other other; }; 00236 #endif 00237 }; 00238 00239 _GLIBCXX_END_NAMESPACE_VERSION 00240 } // namespace std 00241 00242 #endif