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The C and C++ Include Header Files
/usr/include/c++/13/concepts
$ cat -n /usr/include/c++/13/concepts 1 // <concepts> -*- C++ -*- 2 3 // Copyright (C) 2019-2023 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file include/concepts 26 * This is a Standard C++ Library header. 27 * @ingroup concepts 28 */ 29 30 #ifndef _GLIBCXX_CONCEPTS 31 #define _GLIBCXX_CONCEPTS 1 32 33 #if __cplusplus > 201703L && __cpp_concepts >= 201907L 34 35 #pragma GCC system_header 36 37 /** 38 * @defgroup concepts Concepts 39 * @ingroup utilities 40 * 41 * Concepts for checking type requirements. 42 */ 43 44 #include <type_traits> 45 46 namespace std _GLIBCXX_VISIBILITY(default) 47 { 48 _GLIBCXX_BEGIN_NAMESPACE_VERSION 49 50 #define __cpp_lib_concepts 202002L 51 52 // [concepts.lang], language-related concepts 53 54 namespace __detail 55 { 56 template<typename _Tp, typename _Up> 57 concept __same_as = std::is_same_v<_Tp, _Up>; 58 } // namespace __detail 59 60 /// [concept.same], concept same_as 61 template<typename _Tp, typename _Up> 62 concept same_as 63 = __detail::__same_as<_Tp, _Up> && __detail::__same_as<_Up, _Tp>; 64 65 /// [concept.derived], concept derived_from 66 template<typename _Derived, typename _Base> 67 concept derived_from = __is_base_of(_Base, _Derived) 68 && is_convertible_v<const volatile _Derived*, const volatile _Base*>; 69 70 /// [concept.convertible], concept convertible_to 71 template<typename _From, typename _To> 72 concept convertible_to = is_convertible_v<_From, _To> 73 && requires { static_cast<_To>(std::declval<_From>()); }; 74 75 /// [concept.commonref], concept common_reference_with 76 template<typename _Tp, typename _Up> 77 concept common_reference_with 78 = same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> 79 && convertible_to<_Tp, common_reference_t<_Tp, _Up>> 80 && convertible_to<_Up, common_reference_t<_Tp, _Up>>; 81 82 /// [concept.common], concept common_with 83 template<typename _Tp, typename _Up> 84 concept common_with 85 = same_as<common_type_t<_Tp, _Up>, common_type_t<_Up, _Tp>> 86 && requires { 87 static_cast<common_type_t<_Tp, _Up>>(std::declval<_Tp>()); 88 static_cast<common_type_t<_Tp, _Up>>(std::declval<_Up>()); 89 } 90 && common_reference_with<add_lvalue_reference_t<const _Tp>, 91 add_lvalue_reference_t<const _Up>> 92 && common_reference_with<add_lvalue_reference_t<common_type_t<_Tp, _Up>>, 93 common_reference_t< 94 add_lvalue_reference_t<const _Tp>, 95 add_lvalue_reference_t<const _Up>>>; 96 97 // [concepts.arithmetic], arithmetic concepts 98 99 template<typename _Tp> 100 concept integral = is_integral_v<_Tp>; 101 102 template<typename _Tp> 103 concept signed_integral = integral<_Tp> && is_signed_v<_Tp>; 104 105 template<typename _Tp> 106 concept unsigned_integral = integral<_Tp> && !signed_integral<_Tp>; 107 108 template<typename _Tp> 109 concept floating_point = is_floating_point_v<_Tp>; 110 111 namespace __detail 112 { 113 template<typename _Tp> 114 using __cref = const remove_reference_t<_Tp>&; 115 116 template<typename _Tp> 117 concept __class_or_enum 118 = is_class_v<_Tp> || is_union_v<_Tp> || is_enum_v<_Tp>; 119 120 template<typename _Tp> 121 constexpr bool __destructible_impl = false; 122 template<typename _Tp> 123 requires requires(_Tp& __t) { { __t.~_Tp() } noexcept; } 124 constexpr bool __destructible_impl<_Tp> = true; 125 126 template<typename _Tp> 127 constexpr bool __destructible = __destructible_impl<_Tp>; 128 template<typename _Tp> 129 constexpr bool __destructible<_Tp&> = true; 130 template<typename _Tp> 131 constexpr bool __destructible<_Tp&&> = true; 132 template<typename _Tp, size_t _Nm> 133 constexpr bool __destructible<_Tp[_Nm]> = __destructible<_Tp>; 134 135 } // namespace __detail 136 137 /// [concept.assignable], concept assignable_from 138 template<typename _Lhs, typename _Rhs> 139 concept assignable_from 140 = is_lvalue_reference_v<_Lhs> 141 && common_reference_with<__detail::__cref<_Lhs>, __detail::__cref<_Rhs>> 142 && requires(_Lhs __lhs, _Rhs&& __rhs) { 143 { __lhs = static_cast<_Rhs&&>(__rhs) } -> same_as<_Lhs>; 144 }; 145 146 /// [concept.destructible], concept destructible 147 template<typename _Tp> 148 concept destructible = __detail::__destructible<_Tp>; 149 150 /// [concept.constructible], concept constructible_from 151 template<typename _Tp, typename... _Args> 152 concept constructible_from 153 = destructible<_Tp> && is_constructible_v<_Tp, _Args...>; 154 155 /// [concept.defaultinitializable], concept default_initializable 156 template<typename _Tp> 157 concept default_initializable = constructible_from<_Tp> 158 && requires 159 { 160 _Tp{}; 161 (void) ::new _Tp; 162 }; 163 164 /// [concept.moveconstructible], concept move_constructible 165 template<typename _Tp> 166 concept move_constructible 167 = constructible_from<_Tp, _Tp> && convertible_to<_Tp, _Tp>; 168 169 /// [concept.copyconstructible], concept copy_constructible 170 template<typename _Tp> 171 concept copy_constructible 172 = move_constructible<_Tp> 173 && constructible_from<_Tp, _Tp&> && convertible_to<_Tp&, _Tp> 174 && constructible_from<_Tp, const _Tp&> && convertible_to<const _Tp&, _Tp> 175 && constructible_from<_Tp, const _Tp> && convertible_to<const _Tp, _Tp>; 176 177 // [concept.swappable], concept swappable 178 179 namespace ranges 180 { 181 namespace __cust_swap 182 { 183 template<typename _Tp> void swap(_Tp&, _Tp&) = delete; 184 185 template<typename _Tp, typename _Up> 186 concept __adl_swap 187 = (__detail::__class_or_enum<remove_reference_t<_Tp>> 188 || __detail::__class_or_enum<remove_reference_t<_Up>>) 189 && requires(_Tp&& __t, _Up&& __u) { 190 swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); 191 }; 192 193 struct _Swap 194 { 195 private: 196 template<typename _Tp, typename _Up> 197 static constexpr bool 198 _S_noexcept() 199 { 200 if constexpr (__adl_swap<_Tp, _Up>) 201 return noexcept(swap(std::declval<_Tp>(), std::declval<_Up>())); 202 else 203 return is_nothrow_move_constructible_v<remove_reference_t<_Tp>> 204 && is_nothrow_move_assignable_v<remove_reference_t<_Tp>>; 205 } 206 207 public: 208 template<typename _Tp, typename _Up> 209 requires __adl_swap<_Tp, _Up> 210 || (same_as<_Tp, _Up> && is_lvalue_reference_v<_Tp> 211 && move_constructible<remove_reference_t<_Tp>> 212 && assignable_from<_Tp, remove_reference_t<_Tp>>) 213 constexpr void 214 operator()(_Tp&& __t, _Up&& __u) const 215 noexcept(_S_noexcept<_Tp, _Up>()) 216 { 217 if constexpr (__adl_swap<_Tp, _Up>) 218 swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); 219 else 220 { 221 auto __tmp = static_cast<remove_reference_t<_Tp>&&>(__t); 222 __t = static_cast<remove_reference_t<_Tp>&&>(__u); 223 __u = static_cast<remove_reference_t<_Tp>&&>(__tmp); 224 } 225 } 226 227 template<typename _Tp, typename _Up, size_t _Num> 228 requires requires(const _Swap& __swap, _Tp& __e1, _Up& __e2) { 229 __swap(__e1, __e2); 230 } 231 constexpr void 232 operator()(_Tp (&__e1)[_Num], _Up (&__e2)[_Num]) const 233 noexcept(noexcept(std::declval<const _Swap&>()(*__e1, *__e2))) 234 { 235 for (size_t __n = 0; __n < _Num; ++__n) 236 (*this)(__e1[__n], __e2[__n]); 237 } 238 }; 239 } // namespace __cust_swap 240 241 inline namespace __cust 242 { 243 inline constexpr __cust_swap::_Swap swap{}; 244 } // inline namespace __cust 245 } // namespace ranges 246 247 template<typename _Tp> 248 concept swappable 249 = requires(_Tp& __a, _Tp& __b) { ranges::swap(__a, __b); }; 250 251 template<typename _Tp, typename _Up> 252 concept swappable_with = common_reference_with<_Tp, _Up> 253 && requires(_Tp&& __t, _Up&& __u) { 254 ranges::swap(static_cast<_Tp&&>(__t), static_cast<_Tp&&>(__t)); 255 ranges::swap(static_cast<_Up&&>(__u), static_cast<_Up&&>(__u)); 256 ranges::swap(static_cast<_Tp&&>(__t), static_cast<_Up&&>(__u)); 257 ranges::swap(static_cast<_Up&&>(__u), static_cast<_Tp&&>(__t)); 258 }; 259 260 // [concepts.object], Object concepts 261 262 template<typename _Tp> 263 concept movable = is_object_v<_Tp> && move_constructible<_Tp> 264 && assignable_from<_Tp&, _Tp> && swappable<_Tp>; 265 266 template<typename _Tp> 267 concept copyable = copy_constructible<_Tp> && movable<_Tp> 268 && assignable_from<_Tp&, _Tp&> && assignable_from<_Tp&, const _Tp&> 269 && assignable_from<_Tp&, const _Tp>; 270 271 template<typename _Tp> 272 concept semiregular = copyable<_Tp> && default_initializable<_Tp>; 273 274 // [concepts.compare], comparison concepts 275 276 // [concept.booleantestable], Boolean testability 277 namespace __detail 278 { 279 template<typename _Tp> 280 concept __boolean_testable_impl = convertible_to<_Tp, bool>; 281 282 template<typename _Tp> 283 concept __boolean_testable 284 = __boolean_testable_impl<_Tp> 285 && requires(_Tp&& __t) 286 { { !static_cast<_Tp&&>(__t) } -> __boolean_testable_impl; }; 287 } // namespace __detail 288 289 // [concept.equalitycomparable], concept equality_comparable 290 291 namespace __detail 292 { 293 template<typename _Tp, typename _Up> 294 concept __weakly_eq_cmp_with 295 = requires(__detail::__cref<_Tp> __t, __detail::__cref<_Up> __u) { 296 { __t == __u } -> __boolean_testable; 297 { __t != __u } -> __boolean_testable; 298 { __u == __t } -> __boolean_testable; 299 { __u != __t } -> __boolean_testable; 300 }; 301 } // namespace __detail 302 303 template<typename _Tp> 304 concept equality_comparable = __detail::__weakly_eq_cmp_with<_Tp, _Tp>; 305 306 template<typename _Tp, typename _Up> 307 concept equality_comparable_with 308 = equality_comparable<_Tp> && equality_comparable<_Up> 309 && common_reference_with<__detail::__cref<_Tp>, __detail::__cref<_Up>> 310 && equality_comparable<common_reference_t<__detail::__cref<_Tp>, 311 __detail::__cref<_Up>>> 312 && __detail::__weakly_eq_cmp_with<_Tp, _Up>; 313 314 namespace __detail 315 { 316 template<typename _Tp, typename _Up> 317 concept __partially_ordered_with 318 = requires(const remove_reference_t<_Tp>& __t, 319 const remove_reference_t<_Up>& __u) { 320 { __t < __u } -> __boolean_testable; 321 { __t > __u } -> __boolean_testable; 322 { __t <= __u } -> __boolean_testable; 323 { __t >= __u } -> __boolean_testable; 324 { __u < __t } -> __boolean_testable; 325 { __u > __t } -> __boolean_testable; 326 { __u <= __t } -> __boolean_testable; 327 { __u >= __t } -> __boolean_testable; 328 }; 329 } // namespace __detail 330 331 // [concept.totallyordered], concept totally_ordered 332 template<typename _Tp> 333 concept totally_ordered 334 = equality_comparable<_Tp> 335 && __detail::__partially_ordered_with<_Tp, _Tp>; 336 337 template<typename _Tp, typename _Up> 338 concept totally_ordered_with 339 = totally_ordered<_Tp> && totally_ordered<_Up> 340 && equality_comparable_with<_Tp, _Up> 341 && totally_ordered<common_reference_t<__detail::__cref<_Tp>, 342 __detail::__cref<_Up>>> 343 && __detail::__partially_ordered_with<_Tp, _Up>; 344 345 template<typename _Tp> 346 concept regular = semiregular<_Tp> && equality_comparable<_Tp>; 347 348 // [concepts.callable], callable concepts 349 350 /// [concept.invocable], concept invocable 351 template<typename _Fn, typename... _Args> 352 concept invocable = is_invocable_v<_Fn, _Args...>; 353 354 /// [concept.regularinvocable], concept regular_invocable 355 template<typename _Fn, typename... _Args> 356 concept regular_invocable = invocable<_Fn, _Args...>; 357 358 /// [concept.predicate], concept predicate 359 template<typename _Fn, typename... _Args> 360 concept predicate = regular_invocable<_Fn, _Args...> 361 && __detail::__boolean_testable<invoke_result_t<_Fn, _Args...>>; 362 363 /// [concept.relation], concept relation 364 template<typename _Rel, typename _Tp, typename _Up> 365 concept relation 366 = predicate<_Rel, _Tp, _Tp> && predicate<_Rel, _Up, _Up> 367 && predicate<_Rel, _Tp, _Up> && predicate<_Rel, _Up, _Tp>; 368 369 /// [concept.equiv], concept equivalence_relation 370 template<typename _Rel, typename _Tp, typename _Up> 371 concept equivalence_relation = relation<_Rel, _Tp, _Up>; 372 373 /// [concept.strictweakorder], concept strict_weak_order 374 template<typename _Rel, typename _Tp, typename _Up> 375 concept strict_weak_order = relation<_Rel, _Tp, _Up>; 376 377 _GLIBCXX_END_NAMESPACE_VERSION 378 } // namespace 379 #endif // C++2a 380 381 #endif /* _GLIBCXX_CONCEPTS */
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