libstdc++
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00001 // <bits/enable_special_members.h> -*- C++ -*- 00002 00003 // Copyright (C) 2013-2015 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 bits/enable_special_members.h 00026 * This is an internal header file, included by other library headers. 00027 * Do not attempt to use it directly. 00028 */ 00029 00030 #ifndef _ENABLE_SPECIAL_MEMBERS_H 00031 #define _ENABLE_SPECIAL_MEMBERS_H 1 00032 00033 #pragma GCC system_header 00034 00035 namespace std _GLIBCXX_VISIBILITY(default) 00036 { 00037 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00038 00039 /** 00040 * @brief A mixin helper to conditionally enable or disable the default 00041 * constructor. 00042 * @sa _Enable_special_members 00043 */ 00044 template<bool _Switch, typename _Tag = void> 00045 struct _Enable_default_constructor { }; 00046 00047 00048 /** 00049 * @brief A mixin helper to conditionally enable or disable the default 00050 * destructor. 00051 * @sa _Enable_special_members 00052 */ 00053 template<bool _Switch, typename _Tag = void> 00054 struct _Enable_destructor { }; 00055 00056 /** 00057 * @brief A mixin helper to conditionally enable or disable the copy/move 00058 * special members. 00059 * @sa _Enable_special_members 00060 */ 00061 template<bool _Copy, bool _CopyAssignment, 00062 bool _Move, bool _MoveAssignment, 00063 typename _Tag = void> 00064 struct _Enable_copy_move { }; 00065 00066 /** 00067 * @brief A mixin helper to conditionally enable or disable the special 00068 * members. 00069 * 00070 * The @c _Tag type parameter is to make mixin bases unique and thus avoid 00071 * ambiguities. 00072 */ 00073 template<bool _Default, bool _Destructor, 00074 bool _Copy, bool _CopyAssignment, 00075 bool _Move, bool _MoveAssignment, 00076 typename _Tag = void> 00077 struct _Enable_special_members 00078 : private _Enable_default_constructor<_Default, _Tag>, 00079 private _Enable_destructor<_Destructor, _Tag>, 00080 private _Enable_copy_move<_Copy, _CopyAssignment, 00081 _Move, _MoveAssignment, 00082 _Tag> 00083 { }; 00084 00085 // Boilerplate follows. 00086 00087 template<typename _Tag> 00088 struct _Enable_default_constructor<false, _Tag> 00089 { constexpr _Enable_default_constructor() noexcept = delete; }; 00090 00091 template<typename _Tag> 00092 struct _Enable_destructor<false, _Tag> 00093 { ~_Enable_destructor() noexcept = delete; }; 00094 00095 template<typename _Tag> 00096 struct _Enable_copy_move<false, true, true, true, _Tag> 00097 { 00098 constexpr _Enable_copy_move() noexcept = default; 00099 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00100 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00101 _Enable_copy_move& 00102 operator=(_Enable_copy_move const&) noexcept = default; 00103 _Enable_copy_move& 00104 operator=(_Enable_copy_move&&) noexcept = default; 00105 }; 00106 00107 template<typename _Tag> 00108 struct _Enable_copy_move<true, false, true, true, _Tag> 00109 { 00110 constexpr _Enable_copy_move() noexcept = default; 00111 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00112 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00113 _Enable_copy_move& 00114 operator=(_Enable_copy_move const&) noexcept = delete; 00115 _Enable_copy_move& 00116 operator=(_Enable_copy_move&&) noexcept = default; 00117 }; 00118 00119 template<typename _Tag> 00120 struct _Enable_copy_move<false, false, true, true, _Tag> 00121 { 00122 constexpr _Enable_copy_move() noexcept = default; 00123 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00124 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00125 _Enable_copy_move& 00126 operator=(_Enable_copy_move const&) noexcept = delete; 00127 _Enable_copy_move& 00128 operator=(_Enable_copy_move&&) noexcept = default; 00129 }; 00130 00131 template<typename _Tag> 00132 struct _Enable_copy_move<true, true, false, true, _Tag> 00133 { 00134 constexpr _Enable_copy_move() noexcept = default; 00135 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00136 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00137 _Enable_copy_move& 00138 operator=(_Enable_copy_move const&) noexcept = default; 00139 _Enable_copy_move& 00140 operator=(_Enable_copy_move&&) noexcept = default; 00141 }; 00142 00143 template<typename _Tag> 00144 struct _Enable_copy_move<false, true, false, true, _Tag> 00145 { 00146 constexpr _Enable_copy_move() noexcept = default; 00147 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00148 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00149 _Enable_copy_move& 00150 operator=(_Enable_copy_move const&) noexcept = default; 00151 _Enable_copy_move& 00152 operator=(_Enable_copy_move&&) noexcept = default; 00153 }; 00154 00155 template<typename _Tag> 00156 struct _Enable_copy_move<true, false, false, true, _Tag> 00157 { 00158 constexpr _Enable_copy_move() noexcept = default; 00159 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00160 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00161 _Enable_copy_move& 00162 operator=(_Enable_copy_move const&) noexcept = delete; 00163 _Enable_copy_move& 00164 operator=(_Enable_copy_move&&) noexcept = default; 00165 }; 00166 00167 template<typename _Tag> 00168 struct _Enable_copy_move<false, false, false, true, _Tag> 00169 { 00170 constexpr _Enable_copy_move() noexcept = default; 00171 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00172 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00173 _Enable_copy_move& 00174 operator=(_Enable_copy_move const&) noexcept = delete; 00175 _Enable_copy_move& 00176 operator=(_Enable_copy_move&&) noexcept = default; 00177 }; 00178 00179 template<typename _Tag> 00180 struct _Enable_copy_move<true, true, true, false, _Tag> 00181 { 00182 constexpr _Enable_copy_move() noexcept = default; 00183 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00184 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00185 _Enable_copy_move& 00186 operator=(_Enable_copy_move const&) noexcept = default; 00187 _Enable_copy_move& 00188 operator=(_Enable_copy_move&&) noexcept = delete; 00189 }; 00190 00191 template<typename _Tag> 00192 struct _Enable_copy_move<false, true, true, false, _Tag> 00193 { 00194 constexpr _Enable_copy_move() noexcept = default; 00195 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00196 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00197 _Enable_copy_move& 00198 operator=(_Enable_copy_move const&) noexcept = default; 00199 _Enable_copy_move& 00200 operator=(_Enable_copy_move&&) noexcept = delete; 00201 }; 00202 00203 template<typename _Tag> 00204 struct _Enable_copy_move<true, false, true, false, _Tag> 00205 { 00206 constexpr _Enable_copy_move() noexcept = default; 00207 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00208 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00209 _Enable_copy_move& 00210 operator=(_Enable_copy_move const&) noexcept = delete; 00211 _Enable_copy_move& 00212 operator=(_Enable_copy_move&&) noexcept = delete; 00213 }; 00214 00215 template<typename _Tag> 00216 struct _Enable_copy_move<false, false, true, false, _Tag> 00217 { 00218 constexpr _Enable_copy_move() noexcept = default; 00219 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00220 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = default; 00221 _Enable_copy_move& 00222 operator=(_Enable_copy_move const&) noexcept = delete; 00223 _Enable_copy_move& 00224 operator=(_Enable_copy_move&&) noexcept = delete; 00225 }; 00226 00227 template<typename _Tag> 00228 struct _Enable_copy_move<true, true, false, false, _Tag> 00229 { 00230 constexpr _Enable_copy_move() noexcept = default; 00231 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00232 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00233 _Enable_copy_move& 00234 operator=(_Enable_copy_move const&) noexcept = default; 00235 _Enable_copy_move& 00236 operator=(_Enable_copy_move&&) noexcept = delete; 00237 }; 00238 00239 template<typename _Tag> 00240 struct _Enable_copy_move<false, true, false, false, _Tag> 00241 { 00242 constexpr _Enable_copy_move() noexcept = default; 00243 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00244 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00245 _Enable_copy_move& 00246 operator=(_Enable_copy_move const&) noexcept = default; 00247 _Enable_copy_move& 00248 operator=(_Enable_copy_move&&) noexcept = delete; 00249 }; 00250 00251 template<typename _Tag> 00252 struct _Enable_copy_move<true, false, false, false, _Tag> 00253 { 00254 constexpr _Enable_copy_move() noexcept = default; 00255 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = default; 00256 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00257 _Enable_copy_move& 00258 operator=(_Enable_copy_move const&) noexcept = delete; 00259 _Enable_copy_move& 00260 operator=(_Enable_copy_move&&) noexcept = delete; 00261 }; 00262 00263 template<typename _Tag> 00264 struct _Enable_copy_move<false, false, false, false, _Tag> 00265 { 00266 constexpr _Enable_copy_move() noexcept = default; 00267 constexpr _Enable_copy_move(_Enable_copy_move const&) noexcept = delete; 00268 constexpr _Enable_copy_move(_Enable_copy_move&&) noexcept = delete; 00269 _Enable_copy_move& 00270 operator=(_Enable_copy_move const&) noexcept = delete; 00271 _Enable_copy_move& 00272 operator=(_Enable_copy_move&&) noexcept = delete; 00273 }; 00274 00275 _GLIBCXX_END_NAMESPACE_VERSION 00276 } // namespace std 00277 00278 #endif // _ENABLE_SPECIAL_MEMBERS_H