1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TYPE_TRAITS 11#define _LIBCPP_TYPE_TRAITS 12 13/* 14 type_traits synopsis 15 16namespace std 17{ 18 19 // helper class: 20 template <class T, T v> struct integral_constant; 21 typedef integral_constant<bool, true> true_type; // C++11 22 typedef integral_constant<bool, false> false_type; // C++11 23 24 template <bool B> // C++14 25 using bool_constant = integral_constant<bool, B>; // C++14 26 typedef bool_constant<true> true_type; // C++14 27 typedef bool_constant<false> false_type; // C++14 28 29 // helper traits 30 template <bool, class T = void> struct enable_if; 31 template <bool, class T, class F> struct conditional; 32 33 // Primary classification traits: 34 template <class T> struct is_void; 35 template <class T> struct is_null_pointer; // C++14 36 template <class T> struct is_integral; 37 template <class T> struct is_floating_point; 38 template <class T> struct is_array; 39 template <class T> struct is_pointer; 40 template <class T> struct is_lvalue_reference; 41 template <class T> struct is_rvalue_reference; 42 template <class T> struct is_member_object_pointer; 43 template <class T> struct is_member_function_pointer; 44 template <class T> struct is_enum; 45 template <class T> struct is_union; 46 template <class T> struct is_class; 47 template <class T> struct is_function; 48 49 // Secondary classification traits: 50 template <class T> struct is_reference; 51 template <class T> struct is_arithmetic; 52 template <class T> struct is_fundamental; 53 template <class T> struct is_member_pointer; 54 template <class T> struct is_scoped_enum; // C++2b 55 template <class T> struct is_scalar; 56 template <class T> struct is_object; 57 template <class T> struct is_compound; 58 59 // Const-volatile properties and transformations: 60 template <class T> struct is_const; 61 template <class T> struct is_volatile; 62 template <class T> struct remove_const; 63 template <class T> struct remove_volatile; 64 template <class T> struct remove_cv; 65 template <class T> struct add_const; 66 template <class T> struct add_volatile; 67 template <class T> struct add_cv; 68 69 // Reference transformations: 70 template <class T> struct remove_reference; 71 template <class T> struct add_lvalue_reference; 72 template <class T> struct add_rvalue_reference; 73 74 // Pointer transformations: 75 template <class T> struct remove_pointer; 76 template <class T> struct add_pointer; 77 78 template<class T> struct type_identity; // C++20 79 template<class T> 80 using type_identity_t = typename type_identity<T>::type; // C++20 81 82 // Integral properties: 83 template <class T> struct is_signed; 84 template <class T> struct is_unsigned; 85 template <class T> struct make_signed; 86 template <class T> struct make_unsigned; 87 88 // Array properties and transformations: 89 template <class T> struct rank; 90 template <class T, unsigned I = 0> struct extent; 91 template <class T> struct remove_extent; 92 template <class T> struct remove_all_extents; 93 94 template <class T> struct is_bounded_array; // C++20 95 template <class T> struct is_unbounded_array; // C++20 96 97 // Member introspection: 98 template <class T> struct is_pod; 99 template <class T> struct is_trivial; 100 template <class T> struct is_trivially_copyable; 101 template <class T> struct is_standard_layout; 102 template <class T> struct is_literal_type; // Deprecated in C++17; removed in C++20 103 template <class T> struct is_empty; 104 template <class T> struct is_polymorphic; 105 template <class T> struct is_abstract; 106 template <class T> struct is_final; // C++14 107 template <class T> struct is_aggregate; // C++17 108 109 template <class T, class... Args> struct is_constructible; 110 template <class T> struct is_default_constructible; 111 template <class T> struct is_copy_constructible; 112 template <class T> struct is_move_constructible; 113 template <class T, class U> struct is_assignable; 114 template <class T> struct is_copy_assignable; 115 template <class T> struct is_move_assignable; 116 template <class T, class U> struct is_swappable_with; // C++17 117 template <class T> struct is_swappable; // C++17 118 template <class T> struct is_destructible; 119 120 template <class T, class... Args> struct is_trivially_constructible; 121 template <class T> struct is_trivially_default_constructible; 122 template <class T> struct is_trivially_copy_constructible; 123 template <class T> struct is_trivially_move_constructible; 124 template <class T, class U> struct is_trivially_assignable; 125 template <class T> struct is_trivially_copy_assignable; 126 template <class T> struct is_trivially_move_assignable; 127 template <class T> struct is_trivially_destructible; 128 129 template <class T, class... Args> struct is_nothrow_constructible; 130 template <class T> struct is_nothrow_default_constructible; 131 template <class T> struct is_nothrow_copy_constructible; 132 template <class T> struct is_nothrow_move_constructible; 133 template <class T, class U> struct is_nothrow_assignable; 134 template <class T> struct is_nothrow_copy_assignable; 135 template <class T> struct is_nothrow_move_assignable; 136 template <class T, class U> struct is_nothrow_swappable_with; // C++17 137 template <class T> struct is_nothrow_swappable; // C++17 138 template <class T> struct is_nothrow_destructible; 139 140 template <class T> struct has_virtual_destructor; 141 142 template<class T> struct has_unique_object_representations; // C++17 143 144 // Relationships between types: 145 template <class T, class U> struct is_same; 146 template <class Base, class Derived> struct is_base_of; 147 148 template <class From, class To> struct is_convertible; 149 template <typename From, typename To> struct is_nothrow_convertible; // C++20 150 template <typename From, typename To> inline constexpr bool is_nothrow_convertible_v; // C++20 151 152 template <class Fn, class... ArgTypes> struct is_invocable; 153 template <class R, class Fn, class... ArgTypes> struct is_invocable_r; 154 155 template <class Fn, class... ArgTypes> struct is_nothrow_invocable; 156 template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r; 157 158 // Alignment properties and transformations: 159 template <class T> struct alignment_of; 160 template <size_t Len, size_t Align = most_stringent_alignment_requirement> 161 struct aligned_storage; 162 template <size_t Len, class... Types> struct aligned_union; 163 template <class T> struct remove_cvref; // C++20 164 165 template <class T> struct decay; 166 template <class... T> struct common_type; 167 template <class T> struct underlying_type; 168 template <class> class result_of; // undefined; deprecated in C++17; removed in C++20 169 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; // deprecated in C++17; removed in C++20 170 template <class Fn, class... ArgTypes> struct invoke_result; // C++17 171 172 // const-volatile modifications: 173 template <class T> 174 using remove_const_t = typename remove_const<T>::type; // C++14 175 template <class T> 176 using remove_volatile_t = typename remove_volatile<T>::type; // C++14 177 template <class T> 178 using remove_cv_t = typename remove_cv<T>::type; // C++14 179 template <class T> 180 using add_const_t = typename add_const<T>::type; // C++14 181 template <class T> 182 using add_volatile_t = typename add_volatile<T>::type; // C++14 183 template <class T> 184 using add_cv_t = typename add_cv<T>::type; // C++14 185 186 // reference modifications: 187 template <class T> 188 using remove_reference_t = typename remove_reference<T>::type; // C++14 189 template <class T> 190 using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; // C++14 191 template <class T> 192 using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; // C++14 193 194 // sign modifications: 195 template <class T> 196 using make_signed_t = typename make_signed<T>::type; // C++14 197 template <class T> 198 using make_unsigned_t = typename make_unsigned<T>::type; // C++14 199 200 // array modifications: 201 template <class T> 202 using remove_extent_t = typename remove_extent<T>::type; // C++14 203 template <class T> 204 using remove_all_extents_t = typename remove_all_extents<T>::type; // C++14 205 206 template <class T> 207 inline constexpr bool is_bounded_array_v 208 = is_bounded_array<T>::value; // C++20 209 inline constexpr bool is_unbounded_array_v 210 = is_unbounded_array<T>::value; // C++20 211 212 // pointer modifications: 213 template <class T> 214 using remove_pointer_t = typename remove_pointer<T>::type; // C++14 215 template <class T> 216 using add_pointer_t = typename add_pointer<T>::type; // C++14 217 218 // other transformations: 219 template <size_t Len, size_t Align=default-alignment> 220 using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14 221 template <size_t Len, class... Types> 222 using aligned_union_t = typename aligned_union<Len,Types...>::type; // C++14 223 template <class T> 224 using remove_cvref_t = typename remove_cvref<T>::type; // C++20 225 template <class T> 226 using decay_t = typename decay<T>::type; // C++14 227 template <bool b, class T=void> 228 using enable_if_t = typename enable_if<b,T>::type; // C++14 229 template <bool b, class T, class F> 230 using conditional_t = typename conditional<b,T,F>::type; // C++14 231 template <class... T> 232 using common_type_t = typename common_type<T...>::type; // C++14 233 template <class T> 234 using underlying_type_t = typename underlying_type<T>::type; // C++14 235 template <class T> 236 using result_of_t = typename result_of<T>::type; // C++14; deprecated in C++17; removed in C++20 237 template <class Fn, class... ArgTypes> 238 using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; // C++17 239 240 template <class...> 241 using void_t = void; // C++17 242 243 // See C++14 20.10.4.1, primary type categories 244 template <class T> inline constexpr bool is_void_v 245 = is_void<T>::value; // C++17 246 template <class T> inline constexpr bool is_null_pointer_v 247 = is_null_pointer<T>::value; // C++17 248 template <class T> inline constexpr bool is_integral_v 249 = is_integral<T>::value; // C++17 250 template <class T> inline constexpr bool is_floating_point_v 251 = is_floating_point<T>::value; // C++17 252 template <class T> inline constexpr bool is_array_v 253 = is_array<T>::value; // C++17 254 template <class T> inline constexpr bool is_pointer_v 255 = is_pointer<T>::value; // C++17 256 template <class T> inline constexpr bool is_lvalue_reference_v 257 = is_lvalue_reference<T>::value; // C++17 258 template <class T> inline constexpr bool is_rvalue_reference_v 259 = is_rvalue_reference<T>::value; // C++17 260 template <class T> inline constexpr bool is_member_object_pointer_v 261 = is_member_object_pointer<T>::value; // C++17 262 template <class T> inline constexpr bool is_member_function_pointer_v 263 = is_member_function_pointer<T>::value; // C++17 264 template <class T> inline constexpr bool is_enum_v 265 = is_enum<T>::value; // C++17 266 template <class T> inline constexpr bool is_union_v 267 = is_union<T>::value; // C++17 268 template <class T> inline constexpr bool is_class_v 269 = is_class<T>::value; // C++17 270 template <class T> inline constexpr bool is_function_v 271 = is_function<T>::value; // C++17 272 273 // See C++14 20.10.4.2, composite type categories 274 template <class T> inline constexpr bool is_reference_v 275 = is_reference<T>::value; // C++17 276 template <class T> inline constexpr bool is_arithmetic_v 277 = is_arithmetic<T>::value; // C++17 278 template <class T> inline constexpr bool is_fundamental_v 279 = is_fundamental<T>::value; // C++17 280 template <class T> inline constexpr bool is_object_v 281 = is_object<T>::value; // C++17 282 template <class T> inline constexpr bool is_scalar_v 283 = is_scalar<T>::value; // C++17 284 template <class T> inline constexpr bool is_compound_v 285 = is_compound<T>::value; // C++17 286 template <class T> inline constexpr bool is_member_pointer_v 287 = is_member_pointer<T>::value; // C++17 288 template <class T> inline constexpr bool is_scoped_enum_v 289 = is_scoped_enum<T>::value; // C++2b 290 291 // See C++14 20.10.4.3, type properties 292 template <class T> inline constexpr bool is_const_v 293 = is_const<T>::value; // C++17 294 template <class T> inline constexpr bool is_volatile_v 295 = is_volatile<T>::value; // C++17 296 template <class T> inline constexpr bool is_trivial_v 297 = is_trivial<T>::value; // C++17 298 template <class T> inline constexpr bool is_trivially_copyable_v 299 = is_trivially_copyable<T>::value; // C++17 300 template <class T> inline constexpr bool is_standard_layout_v 301 = is_standard_layout<T>::value; // C++17 302 template <class T> inline constexpr bool is_pod_v 303 = is_pod<T>::value; // C++17 304 template <class T> inline constexpr bool is_literal_type_v 305 = is_literal_type<T>::value; // C++17; deprecated in C++17; removed in C++20 306 template <class T> inline constexpr bool is_empty_v 307 = is_empty<T>::value; // C++17 308 template <class T> inline constexpr bool is_polymorphic_v 309 = is_polymorphic<T>::value; // C++17 310 template <class T> inline constexpr bool is_abstract_v 311 = is_abstract<T>::value; // C++17 312 template <class T> inline constexpr bool is_final_v 313 = is_final<T>::value; // C++17 314 template <class T> inline constexpr bool is_aggregate_v 315 = is_aggregate<T>::value; // C++17 316 template <class T> inline constexpr bool is_signed_v 317 = is_signed<T>::value; // C++17 318 template <class T> inline constexpr bool is_unsigned_v 319 = is_unsigned<T>::value; // C++17 320 template <class T, class... Args> inline constexpr bool is_constructible_v 321 = is_constructible<T, Args...>::value; // C++17 322 template <class T> inline constexpr bool is_default_constructible_v 323 = is_default_constructible<T>::value; // C++17 324 template <class T> inline constexpr bool is_copy_constructible_v 325 = is_copy_constructible<T>::value; // C++17 326 template <class T> inline constexpr bool is_move_constructible_v 327 = is_move_constructible<T>::value; // C++17 328 template <class T, class U> inline constexpr bool is_assignable_v 329 = is_assignable<T, U>::value; // C++17 330 template <class T> inline constexpr bool is_copy_assignable_v 331 = is_copy_assignable<T>::value; // C++17 332 template <class T> inline constexpr bool is_move_assignable_v 333 = is_move_assignable<T>::value; // C++17 334 template <class T, class U> inline constexpr bool is_swappable_with_v 335 = is_swappable_with<T, U>::value; // C++17 336 template <class T> inline constexpr bool is_swappable_v 337 = is_swappable<T>::value; // C++17 338 template <class T> inline constexpr bool is_destructible_v 339 = is_destructible<T>::value; // C++17 340 template <class T, class... Args> inline constexpr bool is_trivially_constructible_v 341 = is_trivially_constructible<T, Args...>::value; // C++17 342 template <class T> inline constexpr bool is_trivially_default_constructible_v 343 = is_trivially_default_constructible<T>::value; // C++17 344 template <class T> inline constexpr bool is_trivially_copy_constructible_v 345 = is_trivially_copy_constructible<T>::value; // C++17 346 template <class T> inline constexpr bool is_trivially_move_constructible_v 347 = is_trivially_move_constructible<T>::value; // C++17 348 template <class T, class U> inline constexpr bool is_trivially_assignable_v 349 = is_trivially_assignable<T, U>::value; // C++17 350 template <class T> inline constexpr bool is_trivially_copy_assignable_v 351 = is_trivially_copy_assignable<T>::value; // C++17 352 template <class T> inline constexpr bool is_trivially_move_assignable_v 353 = is_trivially_move_assignable<T>::value; // C++17 354 template <class T> inline constexpr bool is_trivially_destructible_v 355 = is_trivially_destructible<T>::value; // C++17 356 template <class T, class... Args> inline constexpr bool is_nothrow_constructible_v 357 = is_nothrow_constructible<T, Args...>::value; // C++17 358 template <class T> inline constexpr bool is_nothrow_default_constructible_v 359 = is_nothrow_default_constructible<T>::value; // C++17 360 template <class T> inline constexpr bool is_nothrow_copy_constructible_v 361 = is_nothrow_copy_constructible<T>::value; // C++17 362 template <class T> inline constexpr bool is_nothrow_move_constructible_v 363 = is_nothrow_move_constructible<T>::value; // C++17 364 template <class T, class U> inline constexpr bool is_nothrow_assignable_v 365 = is_nothrow_assignable<T, U>::value; // C++17 366 template <class T> inline constexpr bool is_nothrow_copy_assignable_v 367 = is_nothrow_copy_assignable<T>::value; // C++17 368 template <class T> inline constexpr bool is_nothrow_move_assignable_v 369 = is_nothrow_move_assignable<T>::value; // C++17 370 template <class T, class U> inline constexpr bool is_nothrow_swappable_with_v 371 = is_nothrow_swappable_with<T, U>::value; // C++17 372 template <class T> inline constexpr bool is_nothrow_swappable_v 373 = is_nothrow_swappable<T>::value; // C++17 374 template <class T> inline constexpr bool is_nothrow_destructible_v 375 = is_nothrow_destructible<T>::value; // C++17 376 template <class T> inline constexpr bool has_virtual_destructor_v 377 = has_virtual_destructor<T>::value; // C++17 378 template<class T> inline constexpr bool has_unique_object_representations_v // C++17 379 = has_unique_object_representations<T>::value; 380 381 // See C++14 20.10.5, type property queries 382 template <class T> inline constexpr size_t alignment_of_v 383 = alignment_of<T>::value; // C++17 384 template <class T> inline constexpr size_t rank_v 385 = rank<T>::value; // C++17 386 template <class T, unsigned I = 0> inline constexpr size_t extent_v 387 = extent<T, I>::value; // C++17 388 389 // See C++14 20.10.6, type relations 390 template <class T, class U> inline constexpr bool is_same_v 391 = is_same<T, U>::value; // C++17 392 template <class Base, class Derived> inline constexpr bool is_base_of_v 393 = is_base_of<Base, Derived>::value; // C++17 394 template <class From, class To> inline constexpr bool is_convertible_v 395 = is_convertible<From, To>::value; // C++17 396 template <class Fn, class... ArgTypes> inline constexpr bool is_invocable_v 397 = is_invocable<Fn, ArgTypes...>::value; // C++17 398 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_invocable_r_v 399 = is_invocable_r<R, Fn, ArgTypes...>::value; // C++17 400 template <class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_v 401 = is_nothrow_invocable<Fn, ArgTypes...>::value; // C++17 402 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_r_v 403 = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; // C++17 404 405 // [meta.logical], logical operator traits: 406 template<class... B> struct conjunction; // C++17 407 template<class... B> 408 inline constexpr bool conjunction_v = conjunction<B...>::value; // C++17 409 template<class... B> struct disjunction; // C++17 410 template<class... B> 411 inline constexpr bool disjunction_v = disjunction<B...>::value; // C++17 412 template<class B> struct negation; // C++17 413 template<class B> 414 inline constexpr bool negation_v = negation<B>::value; // C++17 415 416} 417 418*/ 419#include <__assert> // all public C++ headers provide the assertion handler 420#include <__config> 421#include <__type_traits/add_const.h> 422#include <__type_traits/add_cv.h> 423#include <__type_traits/add_lvalue_reference.h> 424#include <__type_traits/add_pointer.h> 425#include <__type_traits/add_rvalue_reference.h> 426#include <__type_traits/add_volatile.h> 427#include <__type_traits/conditional.h> 428#include <__type_traits/decay.h> 429#include <__type_traits/enable_if.h> 430#include <__type_traits/extent.h> 431#include <__type_traits/integral_constant.h> 432#include <__type_traits/is_abstract.h> 433#include <__type_traits/is_aggregate.h> 434#include <__type_traits/is_arithmetic.h> 435#include <__type_traits/is_array.h> 436#include <__type_traits/is_base_of.h> 437#include <__type_traits/is_bounded_array.h> 438#include <__type_traits/is_callable.h> 439#include <__type_traits/is_class.h> 440#include <__type_traits/is_compound.h> 441#include <__type_traits/is_const.h> 442#include <__type_traits/is_convertible.h> 443#include <__type_traits/is_empty.h> 444#include <__type_traits/is_enum.h> 445#include <__type_traits/is_final.h> 446#include <__type_traits/is_floating_point.h> 447#include <__type_traits/is_function.h> 448#include <__type_traits/is_fundamental.h> 449#include <__type_traits/is_integral.h> 450#include <__type_traits/is_member_function_pointer.h> 451#include <__type_traits/is_member_object_pointer.h> 452#include <__type_traits/is_member_pointer.h> 453#include <__type_traits/is_null_pointer.h> 454#include <__type_traits/is_object.h> 455#include <__type_traits/is_pointer.h> 456#include <__type_traits/is_reference.h> 457#include <__type_traits/is_reference_wrapper.h> 458#include <__type_traits/is_referenceable.h> 459#include <__type_traits/is_same.h> 460#include <__type_traits/is_scalar.h> 461#include <__type_traits/is_signed.h> 462#include <__type_traits/is_unbounded_array.h> 463#include <__type_traits/is_union.h> 464#include <__type_traits/is_unsigned.h> 465#include <__type_traits/is_void.h> 466#include <__type_traits/is_volatile.h> 467#include <__type_traits/rank.h> 468#include <__type_traits/remove_all_extents.h> 469#include <__type_traits/remove_const.h> 470#include <__type_traits/remove_cv.h> 471#include <__type_traits/remove_extent.h> 472#include <__type_traits/remove_pointer.h> 473#include <__type_traits/remove_reference.h> 474#include <__type_traits/remove_volatile.h> 475#include <__type_traits/type_identity.h> 476#include <__utility/declval.h> 477#include <cstddef> 478#include <version> 479 480#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 481# pragma GCC system_header 482#endif 483 484_LIBCPP_BEGIN_NAMESPACE_STD 485 486template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 487template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 488 489template <bool> struct _MetaBase; 490template <> 491struct _MetaBase<true> { 492 template <class _Tp, class _Up> 493 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 494 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 495 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 496 template <class _First, class...> 497 using _FirstImpl _LIBCPP_NODEBUG = _First; 498 template <class, class _Second, class...> 499 using _SecondImpl _LIBCPP_NODEBUG = _Second; 500 template <class _Result, class _First, class ..._Rest> 501 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 502}; 503 504template <> 505struct _MetaBase<false> { 506 template <class _Tp, class _Up> 507 using _SelectImpl _LIBCPP_NODEBUG = _Up; 508 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 509 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 510 template <class _Result, class ...> 511 using _OrImpl _LIBCPP_NODEBUG = _Result; 512}; 513template <bool _Cond, class _IfRes, class _ElseRes> 514using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 515template <class ..._Rest> 516using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 517template <class _Pred> 518struct _Not : _BoolConstant<!_Pred::value> {}; 519template <class ..._Args> 520using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 521template <class ..._Args> 522using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 523 524template <class ...> using __expand_to_true = true_type; 525template <class ..._Pred> 526__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); 527template <class ...> 528false_type __and_helper(...); 529template <class ..._Pred> 530using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 531 532template <template <class...> class _Func, class ..._Args> 533struct _Lazy : _Func<_Args...> {}; 534 535// Member detector base 536 537template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 538true_type __sfinae_test_impl(int); 539template <template <class...> class, class ...> 540false_type __sfinae_test_impl(...); 541 542template <template <class ...> class _Templ, class ..._Args> 543using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 544 545template <class> 546struct __void_t { typedef void type; }; 547 548template <class _Tp, bool> 549struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 550 551// is_same 552 553template <class _Tp> 554using __test_for_primary_template = __enable_if_t< 555 _IsSame<_Tp, typename _Tp::__primary_template>::value 556 >; 557template <class _Tp> 558using __is_primary_template = _IsValidExpansion< 559 __test_for_primary_template, _Tp 560 >; 561 562// is_integral 563 564// [basic.fundamental] defines five standard signed integer types; 565// __int128_t is an extended signed integer type. 566// The signed and unsigned integer types, plus bool and the 567// five types with "char" in their name, compose the "integral" types. 568 569template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 570template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 571template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 572template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 573template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 574template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 575#ifndef _LIBCPP_HAS_NO_INT128 576template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 577#endif 578 579template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 580template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 581template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 582template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 583template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 584template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 585#ifndef _LIBCPP_HAS_NO_INT128 586template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 587#endif 588 589template <class _Tp> 590struct __unconstref { 591 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 592}; 593 594template <class _Tp> 595using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type; 596 597// __is_same_uncvref 598 599template <class _Tp, class _Up> 600struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {}; 601 602#if _LIBCPP_STD_VER > 17 603// remove_cvref - same as __uncvref 604template <class _Tp> 605struct remove_cvref { 606 using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>; 607}; 608 609template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 610#endif 611 612 613struct __any 614{ 615 __any(...); 616}; 617 618// __is_core_convertible 619 620// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed. 621// We can't test for that, but we can test implicit convertibility by passing it 622// to a function. Notice that __is_core_convertible<void,void> is false, 623// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later. 624 625template <class _Tp, class _Up, class = void> 626struct __is_core_convertible : public false_type {}; 627 628template <class _Tp, class _Up> 629struct __is_core_convertible<_Tp, _Up, decltype( 630 static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() ) 631)> : public true_type {}; 632 633// is_nothrow_convertible 634 635#if _LIBCPP_STD_VER > 17 636 637template <typename _Tp> 638static void __test_noexcept(_Tp) noexcept; 639 640template<typename _Fm, typename _To> 641static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 642__is_nothrow_convertible_test(); 643 644template <typename _Fm, typename _To> 645struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 646{ }; 647 648template <typename _Fm, typename _To> 649struct is_nothrow_convertible : _Or< 650 _And<is_void<_To>, is_void<_Fm>>, 651 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 652>::type { }; 653 654template <typename _Fm, typename _To> 655inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 656 657#endif // _LIBCPP_STD_VER > 17 658 659// is_polymorphic 660 661#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 662 663template <class _Tp> 664struct _LIBCPP_TEMPLATE_VIS is_polymorphic 665 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 666 667#else 668 669template<typename _Tp> char &__is_polymorphic_impl( 670 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 671 int>::type); 672template<typename _Tp> __two &__is_polymorphic_impl(...); 673 674template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 675 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 676 677#endif // __has_feature(is_polymorphic) 678 679#if _LIBCPP_STD_VER > 14 680template <class _Tp> 681inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value; 682#endif 683 684// has_virtual_destructor 685 686#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 687 688template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 689 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 690 691#else 692 693template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 694 : public false_type {}; 695 696#endif 697 698#if _LIBCPP_STD_VER > 14 699template <class _Tp> 700inline constexpr bool has_virtual_destructor_v = has_virtual_destructor<_Tp>::value; 701#endif 702 703// has_unique_object_representations 704 705#if _LIBCPP_STD_VER > 14 706 707template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 708 : public integral_constant<bool, 709 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 710 711template <class _Tp> 712inline constexpr bool has_unique_object_representations_v = has_unique_object_representations<_Tp>::value; 713 714#endif 715 716// alignment_of 717 718template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 719 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 720 721#if _LIBCPP_STD_VER > 14 722template <class _Tp> 723inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; 724#endif 725 726// aligned_storage 727 728template <class _Hp, class _Tp> 729struct __type_list 730{ 731 typedef _Hp _Head; 732 typedef _Tp _Tail; 733}; 734 735struct __nat 736{ 737#ifndef _LIBCPP_CXX03_LANG 738 __nat() = delete; 739 __nat(const __nat&) = delete; 740 __nat& operator=(const __nat&) = delete; 741 ~__nat() = delete; 742#endif 743}; 744 745template <class _Tp> 746struct __align_type 747{ 748 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 749 typedef _Tp type; 750}; 751 752struct __struct_double {long double __lx;}; 753struct __struct_double4 {double __lx[4];}; 754 755typedef 756 __type_list<__align_type<unsigned char>, 757 __type_list<__align_type<unsigned short>, 758 __type_list<__align_type<unsigned int>, 759 __type_list<__align_type<unsigned long>, 760 __type_list<__align_type<unsigned long long>, 761 __type_list<__align_type<double>, 762 __type_list<__align_type<long double>, 763 __type_list<__align_type<__struct_double>, 764 __type_list<__align_type<__struct_double4>, 765 __type_list<__align_type<int*>, 766 __nat 767 > > > > > > > > > > __all_types; 768 769template <size_t _Align> 770struct _ALIGNAS(_Align) __fallback_overaligned {}; 771 772template <class _TL, size_t _Align> struct __find_pod; 773 774template <class _Hp, size_t _Align> 775struct __find_pod<__type_list<_Hp, __nat>, _Align> 776{ 777 typedef typename conditional< 778 _Align == _Hp::value, 779 typename _Hp::type, 780 __fallback_overaligned<_Align> 781 >::type type; 782}; 783 784template <class _Hp, class _Tp, size_t _Align> 785struct __find_pod<__type_list<_Hp, _Tp>, _Align> 786{ 787 typedef typename conditional< 788 _Align == _Hp::value, 789 typename _Hp::type, 790 typename __find_pod<_Tp, _Align>::type 791 >::type type; 792}; 793 794template <class _TL, size_t _Len> struct __find_max_align; 795 796template <class _Hp, size_t _Len> 797struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 798 799template <size_t _Len, size_t _A1, size_t _A2> 800struct __select_align 801{ 802private: 803 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 804 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 805public: 806 static const size_t value = _Len < __max ? __min : __max; 807}; 808 809template <class _Hp, class _Tp, size_t _Len> 810struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 811 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 812 813template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 814struct _LIBCPP_TEMPLATE_VIS aligned_storage 815{ 816 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 817 union type 818 { 819 _Aligner __align; 820 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 821 }; 822}; 823 824#if _LIBCPP_STD_VER > 11 825template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 826 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 827#endif 828 829#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 830template <size_t _Len>\ 831struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 832{\ 833 struct _ALIGNAS(n) type\ 834 {\ 835 unsigned char __lx[(_Len + n - 1)/n * n];\ 836 };\ 837} 838 839_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 840_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 841_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 842_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 843_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 844_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 845_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 846_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 847_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 848_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 849_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 850_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 851_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 852_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 853// PE/COFF does not support alignment beyond 8192 (=0x2000) 854#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 855_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 856#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 857 858#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 859 860 861// aligned_union 862 863template <size_t _I0, size_t ..._In> 864struct __static_max; 865 866template <size_t _I0> 867struct __static_max<_I0> 868{ 869 static const size_t value = _I0; 870}; 871 872template <size_t _I0, size_t _I1, size_t ..._In> 873struct __static_max<_I0, _I1, _In...> 874{ 875 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 876 __static_max<_I1, _In...>::value; 877}; 878 879template <size_t _Len, class _Type0, class ..._Types> 880struct aligned_union 881{ 882 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 883 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 884 static const size_t __len = __static_max<_Len, sizeof(_Type0), 885 sizeof(_Types)...>::value; 886 typedef typename aligned_storage<__len, alignment_value>::type type; 887}; 888 889#if _LIBCPP_STD_VER > 11 890template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 891#endif 892 893template <class _Tp> 894struct __numeric_type 895{ 896 static void __test(...); 897 static float __test(float); 898 static double __test(char); 899 static double __test(int); 900 static double __test(unsigned); 901 static double __test(long); 902 static double __test(unsigned long); 903 static double __test(long long); 904 static double __test(unsigned long long); 905 static double __test(double); 906 static long double __test(long double); 907 908 typedef decltype(__test(declval<_Tp>())) type; 909 static const bool value = _IsNotSame<type, void>::value; 910}; 911 912template <> 913struct __numeric_type<void> 914{ 915 static const bool value = true; 916}; 917 918// __promote 919 920template <class _A1, class _A2 = void, class _A3 = void, 921 bool = __numeric_type<_A1>::value && 922 __numeric_type<_A2>::value && 923 __numeric_type<_A3>::value> 924class __promote_imp 925{ 926public: 927 static const bool value = false; 928}; 929 930template <class _A1, class _A2, class _A3> 931class __promote_imp<_A1, _A2, _A3, true> 932{ 933private: 934 typedef typename __promote_imp<_A1>::type __type1; 935 typedef typename __promote_imp<_A2>::type __type2; 936 typedef typename __promote_imp<_A3>::type __type3; 937public: 938 typedef decltype(__type1() + __type2() + __type3()) type; 939 static const bool value = true; 940}; 941 942template <class _A1, class _A2> 943class __promote_imp<_A1, _A2, void, true> 944{ 945private: 946 typedef typename __promote_imp<_A1>::type __type1; 947 typedef typename __promote_imp<_A2>::type __type2; 948public: 949 typedef decltype(__type1() + __type2()) type; 950 static const bool value = true; 951}; 952 953template <class _A1> 954class __promote_imp<_A1, void, void, true> 955{ 956public: 957 typedef typename __numeric_type<_A1>::type type; 958 static const bool value = true; 959}; 960 961template <class _A1, class _A2 = void, class _A3 = void> 962class __promote : public __promote_imp<_A1, _A2, _A3> {}; 963 964// make_signed / make_unsigned 965 966typedef 967 __type_list<signed char, 968 __type_list<signed short, 969 __type_list<signed int, 970 __type_list<signed long, 971 __type_list<signed long long, 972#ifndef _LIBCPP_HAS_NO_INT128 973 __type_list<__int128_t, 974#endif 975 __nat 976#ifndef _LIBCPP_HAS_NO_INT128 977 > 978#endif 979 > > > > > __signed_types; 980 981typedef 982 __type_list<unsigned char, 983 __type_list<unsigned short, 984 __type_list<unsigned int, 985 __type_list<unsigned long, 986 __type_list<unsigned long long, 987#ifndef _LIBCPP_HAS_NO_INT128 988 __type_list<__uint128_t, 989#endif 990 __nat 991#ifndef _LIBCPP_HAS_NO_INT128 992 > 993#endif 994 > > > > > __unsigned_types; 995 996template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 997 998template <class _Hp, class _Tp, size_t _Size> 999struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 1000{ 1001 typedef _LIBCPP_NODEBUG _Hp type; 1002}; 1003 1004template <class _Hp, class _Tp, size_t _Size> 1005struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 1006{ 1007 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 1008}; 1009 1010template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 1011 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 1012struct __apply_cv 1013{ 1014 typedef _LIBCPP_NODEBUG _Up type; 1015}; 1016 1017template <class _Tp, class _Up> 1018struct __apply_cv<_Tp, _Up, true, false> 1019{ 1020 typedef _LIBCPP_NODEBUG const _Up type; 1021}; 1022 1023template <class _Tp, class _Up> 1024struct __apply_cv<_Tp, _Up, false, true> 1025{ 1026 typedef volatile _Up type; 1027}; 1028 1029template <class _Tp, class _Up> 1030struct __apply_cv<_Tp, _Up, true, true> 1031{ 1032 typedef const volatile _Up type; 1033}; 1034 1035template <class _Tp, class _Up> 1036struct __apply_cv<_Tp&, _Up, false, false> 1037{ 1038 typedef _Up& type; 1039}; 1040 1041template <class _Tp, class _Up> 1042struct __apply_cv<_Tp&, _Up, true, false> 1043{ 1044 typedef const _Up& type; 1045}; 1046 1047template <class _Tp, class _Up> 1048struct __apply_cv<_Tp&, _Up, false, true> 1049{ 1050 typedef volatile _Up& type; 1051}; 1052 1053template <class _Tp, class _Up> 1054struct __apply_cv<_Tp&, _Up, true, true> 1055{ 1056 typedef const volatile _Up& type; 1057}; 1058 1059template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1060struct __make_signed {}; 1061 1062template <class _Tp> 1063struct __make_signed<_Tp, true> 1064{ 1065 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 1066}; 1067 1068template <> struct __make_signed<bool, true> {}; 1069template <> struct __make_signed< signed short, true> {typedef short type;}; 1070template <> struct __make_signed<unsigned short, true> {typedef short type;}; 1071template <> struct __make_signed< signed int, true> {typedef int type;}; 1072template <> struct __make_signed<unsigned int, true> {typedef int type;}; 1073template <> struct __make_signed< signed long, true> {typedef long type;}; 1074template <> struct __make_signed<unsigned long, true> {typedef long type;}; 1075template <> struct __make_signed< signed long long, true> {typedef long long type;}; 1076template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 1077#ifndef _LIBCPP_HAS_NO_INT128 1078template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 1079template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 1080#endif 1081 1082template <class _Tp> 1083struct _LIBCPP_TEMPLATE_VIS make_signed 1084{ 1085 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 1086}; 1087 1088#if _LIBCPP_STD_VER > 11 1089template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 1090#endif 1091 1092template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1093struct __make_unsigned {}; 1094 1095template <class _Tp> 1096struct __make_unsigned<_Tp, true> 1097{ 1098 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 1099}; 1100 1101template <> struct __make_unsigned<bool, true> {}; 1102template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 1103template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 1104template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 1105template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 1106template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 1107template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 1108template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 1109template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 1110#ifndef _LIBCPP_HAS_NO_INT128 1111template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 1112template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 1113#endif 1114 1115template <class _Tp> 1116struct _LIBCPP_TEMPLATE_VIS make_unsigned 1117{ 1118 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 1119}; 1120 1121#if _LIBCPP_STD_VER > 11 1122template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 1123#endif 1124 1125#ifndef _LIBCPP_CXX03_LANG 1126template <class _Tp> 1127_LIBCPP_HIDE_FROM_ABI constexpr 1128typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 1129 return static_cast<typename make_unsigned<_Tp>::type>(__x); 1130} 1131#endif 1132 1133#if _LIBCPP_STD_VER > 14 1134template <class...> using void_t = void; 1135#endif 1136 1137#if _LIBCPP_STD_VER > 17 1138// Let COND_RES(X, Y) be: 1139template <class _Tp, class _Up> 1140using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 1141 1142template <class _Tp, class _Up, class = void> 1143struct __common_type3 {}; 1144 1145// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 1146template <class _Tp, class _Up> 1147struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 1148{ 1149 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 1150}; 1151 1152template <class _Tp, class _Up, class = void> 1153struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 1154#else 1155template <class _Tp, class _Up, class = void> 1156struct __common_type2_imp {}; 1157#endif 1158 1159// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 1160template <class _Tp, class _Up> 1161struct __common_type2_imp<_Tp, _Up, 1162 typename __void_t<decltype( 1163 true ? declval<_Tp>() : declval<_Up>() 1164 )>::type> 1165{ 1166 typedef _LIBCPP_NODEBUG typename decay<decltype( 1167 true ? declval<_Tp>() : declval<_Up>() 1168 )>::type type; 1169}; 1170 1171template <class, class = void> 1172struct __common_type_impl {}; 1173 1174// Clang provides variadic templates in C++03 as an extension. 1175#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 1176# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 1177template <class... _Tp> 1178struct __common_types; 1179template <class... _Tp> 1180struct _LIBCPP_TEMPLATE_VIS common_type; 1181#else 1182# define _LIBCPP_OPTIONAL_PACK(...) 1183struct __no_arg; 1184template <class _Tp, class _Up, class = __no_arg> 1185struct __common_types; 1186template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 1187 class _Unused = __no_arg> 1188struct common_type { 1189 static_assert(sizeof(_Unused) == 0, 1190 "common_type accepts at most 3 arguments in C++03"); 1191}; 1192#endif // _LIBCPP_CXX03_LANG 1193 1194template <class _Tp, class _Up> 1195struct __common_type_impl< 1196 __common_types<_Tp, _Up>, 1197 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1198{ 1199 typedef typename common_type<_Tp, _Up>::type type; 1200}; 1201 1202template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1203struct __common_type_impl< 1204 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 1205 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1206 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 1207 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 1208}; 1209 1210// bullet 1 - sizeof...(Tp) == 0 1211 1212template <> 1213struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 1214 1215// bullet 2 - sizeof...(Tp) == 1 1216 1217template <class _Tp> 1218struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 1219 : public common_type<_Tp, _Tp> {}; 1220 1221// bullet 3 - sizeof...(Tp) == 2 1222 1223// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 1224template <class _Tp, class _Up> 1225struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 1226 : conditional< 1227 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 1228 __common_type2_imp<_Tp, _Up>, 1229 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 1230 >::type 1231{}; 1232 1233// bullet 4 - sizeof...(Tp) > 2 1234 1235template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1236struct _LIBCPP_TEMPLATE_VIS 1237 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 1238 : __common_type_impl< 1239 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 1240 1241#undef _LIBCPP_OPTIONAL_PACK 1242 1243#if _LIBCPP_STD_VER > 11 1244template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 1245#endif 1246 1247#if _LIBCPP_STD_VER > 11 1248// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 1249// top-level cv-qualifiers. 1250template <class _From, class _To> 1251struct __copy_cv 1252{ 1253 using type = _To; 1254}; 1255 1256template <class _From, class _To> 1257struct __copy_cv<const _From, _To> 1258{ 1259 using type = add_const_t<_To>; 1260}; 1261 1262template <class _From, class _To> 1263struct __copy_cv<volatile _From, _To> 1264{ 1265 using type = add_volatile_t<_To>; 1266}; 1267 1268template <class _From, class _To> 1269struct __copy_cv<const volatile _From, _To> 1270{ 1271 using type = add_cv_t<_To>; 1272}; 1273 1274template <class _From, class _To> 1275using __copy_cv_t = typename __copy_cv<_From, _To>::type; 1276 1277template <class _From, class _To> 1278struct __copy_cvref 1279{ 1280 using type = __copy_cv_t<_From, _To>; 1281}; 1282 1283template <class _From, class _To> 1284struct __copy_cvref<_From&, _To> 1285{ 1286 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 1287}; 1288 1289template <class _From, class _To> 1290struct __copy_cvref<_From&&, _To> 1291{ 1292 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 1293}; 1294 1295template <class _From, class _To> 1296using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 1297 1298#endif // _LIBCPP_STD_VER > 11 1299 1300// common_reference 1301#if _LIBCPP_STD_VER > 17 1302// Let COND_RES(X, Y) be: 1303template <class _Xp, class _Yp> 1304using __cond_res = 1305 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 1306 1307// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 1308// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 1309// `U`. 1310// [Note: `XREF(A)` is `__xref<A>::template __apply`] 1311template <class _Tp> 1312struct __xref { 1313 template<class _Up> 1314 using __apply = __copy_cvref_t<_Tp, _Up>; 1315}; 1316 1317// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 1318// and let COMMON-REF(A, B) be: 1319template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 1320struct __common_ref; 1321 1322template<class _Xp, class _Yp> 1323using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 1324 1325template<class _Xp, class _Yp> 1326using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 1327 1328 1329// If A and B are both lvalue reference types, COMMON-REF(A, B) is 1330// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 1331template<class _Ap, class _Bp, class _Xp, class _Yp> 1332requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 1333struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 1334{ 1335 using __type = __cv_cond_res<_Xp, _Yp>; 1336}; 1337 1338// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 1339template <class _Xp, class _Yp> 1340using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 1341 1342 1343// .... If A and B are both rvalue reference types, C is well-formed, and 1344// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 1345template<class _Ap, class _Bp, class _Xp, class _Yp> 1346requires 1347 requires { typename __common_ref_C<_Xp, _Yp>; } && 1348 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 1349 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 1350struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 1351{ 1352 using __type = __common_ref_C<_Xp, _Yp>; 1353}; 1354 1355// Otherwise, let D be COMMON-REF(const X&, Y&). ... 1356template <class _Tp, class _Up> 1357using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 1358 1359// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 1360// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 1361template<class _Ap, class _Bp, class _Xp, class _Yp> 1362requires requires { typename __common_ref_D<_Xp, _Yp>; } && 1363 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 1364struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 1365{ 1366 using __type = __common_ref_D<_Xp, _Yp>; 1367}; 1368 1369// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 1370// COMMON-REF(A, B) is COMMON-REF(B, A). 1371template<class _Ap, class _Bp, class _Xp, class _Yp> 1372struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 1373 1374// Otherwise, COMMON-REF(A, B) is ill-formed. 1375template<class _Ap, class _Bp, class _Xp, class _Yp> 1376struct __common_ref {}; 1377 1378// Note C: For the common_reference trait applied to a parameter pack [...] 1379 1380template <class...> 1381struct common_reference; 1382 1383template <class... _Types> 1384using common_reference_t = typename common_reference<_Types...>::type; 1385 1386// bullet 1 - sizeof...(T) == 0 1387template<> 1388struct common_reference<> {}; 1389 1390// bullet 2 - sizeof...(T) == 1 1391template <class _Tp> 1392struct common_reference<_Tp> 1393{ 1394 using type = _Tp; 1395}; 1396 1397// bullet 3 - sizeof...(T) == 2 1398template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 1399template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 1400template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 1401 1402// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 1403// the member typedef `type` denotes that type. 1404template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 1405 1406template <class _Tp, class _Up> 1407requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 1408struct __common_reference_sub_bullet1<_Tp, _Up> 1409{ 1410 using type = __common_ref_t<_Tp, _Up>; 1411}; 1412 1413// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 1414// is well-formed, then the member typedef `type` denotes that type. 1415template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 1416 1417template <class _Tp, class _Up> 1418using __basic_common_reference_t = typename basic_common_reference< 1419 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 1420 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 1421 1422template <class _Tp, class _Up> 1423requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 1424struct __common_reference_sub_bullet2<_Tp, _Up> 1425{ 1426 using type = __basic_common_reference_t<_Tp, _Up>; 1427}; 1428 1429// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 1430// then the member typedef `type` denotes that type. 1431template <class _Tp, class _Up> 1432requires requires { typename __cond_res<_Tp, _Up>; } 1433struct __common_reference_sub_bullet3<_Tp, _Up> 1434{ 1435 using type = __cond_res<_Tp, _Up>; 1436}; 1437 1438 1439// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 1440// then the member typedef `type` denotes that type. 1441// - Otherwise, there shall be no member `type`. 1442template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 1443 1444// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 1445// any, as `common_reference_t<C, Rest...>`. 1446template <class _Tp, class _Up, class _Vp, class... _Rest> 1447requires requires { typename common_reference_t<_Tp, _Up>; } 1448struct common_reference<_Tp, _Up, _Vp, _Rest...> 1449 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 1450{}; 1451 1452// bullet 5 - Otherwise, there shall be no member `type`. 1453template <class...> struct common_reference {}; 1454 1455#endif // _LIBCPP_STD_VER > 17 1456 1457// is_assignable 1458 1459template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG _Tp type; }; 1460 1461#if __has_keyword(__is_assignable) 1462 1463template<class _Tp, class _Up> 1464struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { }; 1465 1466#if _LIBCPP_STD_VER > 14 1467template <class _Tp, class _Arg> 1468inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Arg); 1469#endif 1470 1471#else // __has_keyword(__is_assignable) 1472 1473template <class _Tp, class _Arg> 1474typename __select_2nd<decltype((declval<_Tp>() = declval<_Arg>())), true_type>::type 1475__is_assignable_test(int); 1476 1477template <class, class> 1478false_type __is_assignable_test(...); 1479 1480 1481template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 1482struct __is_assignable_imp 1483 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 1484 1485template <class _Tp, class _Arg> 1486struct __is_assignable_imp<_Tp, _Arg, true> 1487 : public false_type 1488{ 1489}; 1490 1491template <class _Tp, class _Arg> 1492struct is_assignable 1493 : public __is_assignable_imp<_Tp, _Arg> {}; 1494 1495#if _LIBCPP_STD_VER > 14 1496template <class _Tp, class _Arg> 1497inline constexpr bool is_assignable_v = is_assignable<_Tp, _Arg>::value; 1498#endif 1499 1500#endif // __has_keyword(__is_assignable) 1501 1502// is_copy_assignable 1503 1504template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 1505 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 1506 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1507 1508#if _LIBCPP_STD_VER > 14 1509template <class _Tp> 1510inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value; 1511#endif 1512 1513// is_move_assignable 1514 1515template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 1516 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 1517 typename add_rvalue_reference<_Tp>::type> {}; 1518 1519#if _LIBCPP_STD_VER > 14 1520template <class _Tp> 1521inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value; 1522#endif 1523 1524// is_destructible 1525 1526#if __has_keyword(__is_destructible) 1527 1528template<class _Tp> 1529struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 1530 1531#if _LIBCPP_STD_VER > 14 1532template <class _Tp> 1533inline constexpr bool is_destructible_v = __is_destructible(_Tp); 1534#endif 1535 1536#else // __has_keyword(__is_destructible) 1537 1538// if it's a reference, return true 1539// if it's a function, return false 1540// if it's void, return false 1541// if it's an array of unknown bound, return false 1542// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 1543// where _Up is remove_all_extents<_Tp>::type 1544 1545template <class> 1546struct __is_destructible_apply { typedef int type; }; 1547 1548template <typename _Tp> 1549struct __is_destructor_wellformed { 1550 template <typename _Tp1> 1551 static char __test ( 1552 typename __is_destructible_apply<decltype(declval<_Tp1&>().~_Tp1())>::type 1553 ); 1554 1555 template <typename _Tp1> 1556 static __two __test (...); 1557 1558 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 1559}; 1560 1561template <class _Tp, bool> 1562struct __destructible_imp; 1563 1564template <class _Tp> 1565struct __destructible_imp<_Tp, false> 1566 : public integral_constant<bool, 1567 __is_destructor_wellformed<typename remove_all_extents<_Tp>::type>::value> {}; 1568 1569template <class _Tp> 1570struct __destructible_imp<_Tp, true> 1571 : public true_type {}; 1572 1573template <class _Tp, bool> 1574struct __destructible_false; 1575 1576template <class _Tp> 1577struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, is_reference<_Tp>::value> {}; 1578 1579template <class _Tp> 1580struct __destructible_false<_Tp, true> : public false_type {}; 1581 1582template <class _Tp> 1583struct is_destructible 1584 : public __destructible_false<_Tp, is_function<_Tp>::value> {}; 1585 1586template <class _Tp> 1587struct is_destructible<_Tp[]> 1588 : public false_type {}; 1589 1590template <> 1591struct is_destructible<void> 1592 : public false_type {}; 1593 1594#if _LIBCPP_STD_VER > 14 1595template <class _Tp> 1596inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; 1597#endif 1598 1599#endif // __has_keyword(__is_destructible) 1600 1601template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 1602struct __member_pointer_traits_imp 1603{ 1604}; 1605 1606template <class _Rp, class _Class, class ..._Param> 1607struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 1608{ 1609 typedef _Class _ClassType; 1610 typedef _Rp _ReturnType; 1611 typedef _Rp (_FnType) (_Param...); 1612}; 1613 1614template <class _Rp, class _Class, class ..._Param> 1615struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 1616{ 1617 typedef _Class _ClassType; 1618 typedef _Rp _ReturnType; 1619 typedef _Rp (_FnType) (_Param..., ...); 1620}; 1621 1622template <class _Rp, class _Class, class ..._Param> 1623struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 1624{ 1625 typedef _Class const _ClassType; 1626 typedef _Rp _ReturnType; 1627 typedef _Rp (_FnType) (_Param...); 1628}; 1629 1630template <class _Rp, class _Class, class ..._Param> 1631struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 1632{ 1633 typedef _Class const _ClassType; 1634 typedef _Rp _ReturnType; 1635 typedef _Rp (_FnType) (_Param..., ...); 1636}; 1637 1638template <class _Rp, class _Class, class ..._Param> 1639struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 1640{ 1641 typedef _Class volatile _ClassType; 1642 typedef _Rp _ReturnType; 1643 typedef _Rp (_FnType) (_Param...); 1644}; 1645 1646template <class _Rp, class _Class, class ..._Param> 1647struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 1648{ 1649 typedef _Class volatile _ClassType; 1650 typedef _Rp _ReturnType; 1651 typedef _Rp (_FnType) (_Param..., ...); 1652}; 1653 1654template <class _Rp, class _Class, class ..._Param> 1655struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 1656{ 1657 typedef _Class const volatile _ClassType; 1658 typedef _Rp _ReturnType; 1659 typedef _Rp (_FnType) (_Param...); 1660}; 1661 1662template <class _Rp, class _Class, class ..._Param> 1663struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 1664{ 1665 typedef _Class const volatile _ClassType; 1666 typedef _Rp _ReturnType; 1667 typedef _Rp (_FnType) (_Param..., ...); 1668}; 1669 1670#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 1671 1672template <class _Rp, class _Class, class ..._Param> 1673struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 1674{ 1675 typedef _Class& _ClassType; 1676 typedef _Rp _ReturnType; 1677 typedef _Rp (_FnType) (_Param...); 1678}; 1679 1680template <class _Rp, class _Class, class ..._Param> 1681struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 1682{ 1683 typedef _Class& _ClassType; 1684 typedef _Rp _ReturnType; 1685 typedef _Rp (_FnType) (_Param..., ...); 1686}; 1687 1688template <class _Rp, class _Class, class ..._Param> 1689struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 1690{ 1691 typedef _Class const& _ClassType; 1692 typedef _Rp _ReturnType; 1693 typedef _Rp (_FnType) (_Param...); 1694}; 1695 1696template <class _Rp, class _Class, class ..._Param> 1697struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 1698{ 1699 typedef _Class const& _ClassType; 1700 typedef _Rp _ReturnType; 1701 typedef _Rp (_FnType) (_Param..., ...); 1702}; 1703 1704template <class _Rp, class _Class, class ..._Param> 1705struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 1706{ 1707 typedef _Class volatile& _ClassType; 1708 typedef _Rp _ReturnType; 1709 typedef _Rp (_FnType) (_Param...); 1710}; 1711 1712template <class _Rp, class _Class, class ..._Param> 1713struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 1714{ 1715 typedef _Class volatile& _ClassType; 1716 typedef _Rp _ReturnType; 1717 typedef _Rp (_FnType) (_Param..., ...); 1718}; 1719 1720template <class _Rp, class _Class, class ..._Param> 1721struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 1722{ 1723 typedef _Class const volatile& _ClassType; 1724 typedef _Rp _ReturnType; 1725 typedef _Rp (_FnType) (_Param...); 1726}; 1727 1728template <class _Rp, class _Class, class ..._Param> 1729struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 1730{ 1731 typedef _Class const volatile& _ClassType; 1732 typedef _Rp _ReturnType; 1733 typedef _Rp (_FnType) (_Param..., ...); 1734}; 1735 1736template <class _Rp, class _Class, class ..._Param> 1737struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 1738{ 1739 typedef _Class&& _ClassType; 1740 typedef _Rp _ReturnType; 1741 typedef _Rp (_FnType) (_Param...); 1742}; 1743 1744template <class _Rp, class _Class, class ..._Param> 1745struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 1746{ 1747 typedef _Class&& _ClassType; 1748 typedef _Rp _ReturnType; 1749 typedef _Rp (_FnType) (_Param..., ...); 1750}; 1751 1752template <class _Rp, class _Class, class ..._Param> 1753struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 1754{ 1755 typedef _Class const&& _ClassType; 1756 typedef _Rp _ReturnType; 1757 typedef _Rp (_FnType) (_Param...); 1758}; 1759 1760template <class _Rp, class _Class, class ..._Param> 1761struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 1762{ 1763 typedef _Class const&& _ClassType; 1764 typedef _Rp _ReturnType; 1765 typedef _Rp (_FnType) (_Param..., ...); 1766}; 1767 1768template <class _Rp, class _Class, class ..._Param> 1769struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 1770{ 1771 typedef _Class volatile&& _ClassType; 1772 typedef _Rp _ReturnType; 1773 typedef _Rp (_FnType) (_Param...); 1774}; 1775 1776template <class _Rp, class _Class, class ..._Param> 1777struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 1778{ 1779 typedef _Class volatile&& _ClassType; 1780 typedef _Rp _ReturnType; 1781 typedef _Rp (_FnType) (_Param..., ...); 1782}; 1783 1784template <class _Rp, class _Class, class ..._Param> 1785struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 1786{ 1787 typedef _Class const volatile&& _ClassType; 1788 typedef _Rp _ReturnType; 1789 typedef _Rp (_FnType) (_Param...); 1790}; 1791 1792template <class _Rp, class _Class, class ..._Param> 1793struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 1794{ 1795 typedef _Class const volatile&& _ClassType; 1796 typedef _Rp _ReturnType; 1797 typedef _Rp (_FnType) (_Param..., ...); 1798}; 1799 1800#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 1801 1802 1803template <class _Rp, class _Class> 1804struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 1805{ 1806 typedef _Class _ClassType; 1807 typedef _Rp _ReturnType; 1808}; 1809 1810template <class _MP> 1811struct __member_pointer_traits 1812 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 1813 is_member_function_pointer<_MP>::value, 1814 is_member_object_pointer<_MP>::value> 1815{ 1816// typedef ... _ClassType; 1817// typedef ... _ReturnType; 1818// typedef ... _FnType; 1819}; 1820 1821 1822template <class _DecayedFp> 1823struct __member_pointer_class_type {}; 1824 1825template <class _Ret, class _ClassType> 1826struct __member_pointer_class_type<_Ret _ClassType::*> { 1827 typedef _ClassType type; 1828}; 1829 1830// template <class T, class... Args> struct is_constructible; 1831 1832template <class _Tp, class ..._Args> 1833struct _LIBCPP_TEMPLATE_VIS is_constructible 1834 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 1835{ }; 1836 1837#if _LIBCPP_STD_VER > 14 1838template <class _Tp, class ..._Args> 1839inline constexpr bool is_constructible_v = is_constructible<_Tp, _Args...>::value; 1840#endif 1841 1842// is_default_constructible 1843 1844template <class _Tp> 1845struct _LIBCPP_TEMPLATE_VIS is_default_constructible 1846 : public is_constructible<_Tp> 1847 {}; 1848 1849#if _LIBCPP_STD_VER > 14 1850template <class _Tp> 1851inline constexpr bool is_default_constructible_v = is_default_constructible<_Tp>::value; 1852#endif 1853 1854#ifndef _LIBCPP_CXX03_LANG 1855// First of all, we can't implement this check in C++03 mode because the {} 1856// default initialization syntax isn't valid. 1857// Second, we implement the trait in a funny manner with two defaulted template 1858// arguments to workaround Clang's PR43454. 1859template <class _Tp> 1860void __test_implicit_default_constructible(_Tp); 1861 1862template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 1863struct __is_implicitly_default_constructible 1864 : false_type 1865{ }; 1866 1867template <class _Tp> 1868struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 1869 : true_type 1870{ }; 1871 1872template <class _Tp> 1873struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 1874 : false_type 1875{ }; 1876#endif // !C++03 1877 1878// is_copy_constructible 1879 1880template <class _Tp> 1881struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 1882 : public is_constructible<_Tp, 1883 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1884 1885#if _LIBCPP_STD_VER > 14 1886template <class _Tp> 1887inline constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value; 1888#endif 1889 1890// is_move_constructible 1891 1892template <class _Tp> 1893struct _LIBCPP_TEMPLATE_VIS is_move_constructible 1894 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 1895 {}; 1896 1897#if _LIBCPP_STD_VER > 14 1898template <class _Tp> 1899inline constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value; 1900#endif 1901 1902// is_trivially_constructible 1903 1904template <class _Tp, class... _Args> 1905struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 1906 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 1907{ 1908}; 1909 1910#if _LIBCPP_STD_VER > 14 1911template <class _Tp, class... _Args> 1912inline constexpr bool is_trivially_constructible_v = is_trivially_constructible<_Tp, _Args...>::value; 1913#endif 1914 1915// is_trivially_default_constructible 1916 1917template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 1918 : public is_trivially_constructible<_Tp> 1919 {}; 1920 1921#if _LIBCPP_STD_VER > 14 1922template <class _Tp> 1923inline constexpr bool is_trivially_default_constructible_v = is_trivially_default_constructible<_Tp>::value; 1924#endif 1925 1926// is_trivially_copy_constructible 1927 1928template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 1929 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 1930 {}; 1931 1932#if _LIBCPP_STD_VER > 14 1933template <class _Tp> 1934inline constexpr bool is_trivially_copy_constructible_v = is_trivially_copy_constructible<_Tp>::value; 1935#endif 1936 1937// is_trivially_move_constructible 1938 1939template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 1940 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 1941 {}; 1942 1943#if _LIBCPP_STD_VER > 14 1944template <class _Tp> 1945inline constexpr bool is_trivially_move_constructible_v = is_trivially_move_constructible<_Tp>::value; 1946#endif 1947 1948// is_trivially_assignable 1949 1950template <class _Tp, class _Arg> 1951struct is_trivially_assignable 1952 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 1953{ }; 1954 1955#if _LIBCPP_STD_VER > 14 1956template <class _Tp, class _Arg> 1957inline constexpr bool is_trivially_assignable_v = is_trivially_assignable<_Tp, _Arg>::value; 1958#endif 1959 1960// is_trivially_copy_assignable 1961 1962template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 1963 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 1964 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1965 1966#if _LIBCPP_STD_VER > 14 1967template <class _Tp> 1968inline constexpr bool is_trivially_copy_assignable_v = is_trivially_copy_assignable<_Tp>::value; 1969#endif 1970 1971// is_trivially_move_assignable 1972 1973template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 1974 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 1975 typename add_rvalue_reference<_Tp>::type> 1976 {}; 1977 1978#if _LIBCPP_STD_VER > 14 1979template <class _Tp> 1980inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<_Tp>::value; 1981#endif 1982 1983// is_trivially_destructible 1984 1985#if __has_keyword(__is_trivially_destructible) 1986 1987template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 1988 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 1989 1990#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 1991 1992template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 1993 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 1994 1995#else 1996 1997template <class _Tp> struct __libcpp_trivial_destructor 1998 : public integral_constant<bool, is_scalar<_Tp>::value || 1999 is_reference<_Tp>::value> {}; 2000 2001template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 2002 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 2003 2004template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 2005 : public false_type {}; 2006 2007#endif 2008 2009#if _LIBCPP_STD_VER > 14 2010template <class _Tp> 2011inline constexpr bool is_trivially_destructible_v = is_trivially_destructible<_Tp>::value; 2012#endif 2013 2014// is_nothrow_constructible 2015 2016#if __has_keyword(__is_nothrow_constructible) 2017 2018template <class _Tp, class... _Args> 2019struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 2020 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 2021 2022#else 2023 2024template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 2025 2026template <class _Tp, class... _Args> 2027struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 2028 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 2029{ 2030}; 2031 2032template <class _Tp> 2033void __implicit_conversion_to(_Tp) noexcept { } 2034 2035template <class _Tp, class _Arg> 2036struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 2037 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 2038{ 2039}; 2040 2041template <class _Tp, bool _IsReference, class... _Args> 2042struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 2043 : public false_type 2044{ 2045}; 2046 2047template <class _Tp, class... _Args> 2048struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 2049 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 2050{ 2051}; 2052 2053template <class _Tp, size_t _Ns> 2054struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 2055 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 2056{ 2057}; 2058 2059#endif // _LIBCPP_HAS_NO_NOEXCEPT 2060 2061 2062#if _LIBCPP_STD_VER > 14 2063template <class _Tp, class ..._Args> 2064inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; 2065#endif 2066 2067// is_nothrow_default_constructible 2068 2069template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 2070 : public is_nothrow_constructible<_Tp> 2071 {}; 2072 2073#if _LIBCPP_STD_VER > 14 2074template <class _Tp> 2075inline constexpr bool is_nothrow_default_constructible_v = is_nothrow_default_constructible<_Tp>::value; 2076#endif 2077 2078// is_nothrow_copy_constructible 2079 2080template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 2081 : public is_nothrow_constructible<_Tp, 2082 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2083 2084#if _LIBCPP_STD_VER > 14 2085template <class _Tp> 2086inline constexpr bool is_nothrow_copy_constructible_v = is_nothrow_copy_constructible<_Tp>::value; 2087#endif 2088 2089// is_nothrow_move_constructible 2090 2091template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 2092 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2093 {}; 2094 2095#if _LIBCPP_STD_VER > 14 2096template <class _Tp> 2097inline constexpr bool is_nothrow_move_constructible_v = is_nothrow_move_constructible<_Tp>::value; 2098#endif 2099 2100// is_nothrow_assignable 2101 2102#if __has_keyword(__is_nothrow_assignable) 2103 2104template <class _Tp, class _Arg> 2105struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 2106 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 2107 2108#else 2109 2110template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 2111 2112template <class _Tp, class _Arg> 2113struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 2114 : public false_type 2115{ 2116}; 2117 2118template <class _Tp, class _Arg> 2119struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 2120 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Arg>()) > 2121{ 2122}; 2123 2124template <class _Tp, class _Arg> 2125struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 2126 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 2127{ 2128}; 2129 2130#endif // _LIBCPP_HAS_NO_NOEXCEPT 2131 2132#if _LIBCPP_STD_VER > 14 2133template <class _Tp, class _Arg> 2134inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<_Tp, _Arg>::value; 2135#endif 2136 2137// is_nothrow_copy_assignable 2138 2139template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 2140 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 2141 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2142 2143#if _LIBCPP_STD_VER > 14 2144template <class _Tp> 2145inline constexpr bool is_nothrow_copy_assignable_v = is_nothrow_copy_assignable<_Tp>::value; 2146#endif 2147 2148// is_nothrow_move_assignable 2149 2150template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 2151 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 2152 typename add_rvalue_reference<_Tp>::type> 2153 {}; 2154 2155#if _LIBCPP_STD_VER > 14 2156template <class _Tp> 2157inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<_Tp>::value; 2158#endif 2159 2160// is_nothrow_destructible 2161 2162#if !defined(_LIBCPP_CXX03_LANG) 2163 2164template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 2165 2166template <class _Tp> 2167struct __libcpp_is_nothrow_destructible<false, _Tp> 2168 : public false_type 2169{ 2170}; 2171 2172template <class _Tp> 2173struct __libcpp_is_nothrow_destructible<true, _Tp> 2174 : public integral_constant<bool, noexcept(declval<_Tp>().~_Tp()) > 2175{ 2176}; 2177 2178template <class _Tp> 2179struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 2180 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 2181{ 2182}; 2183 2184template <class _Tp, size_t _Ns> 2185struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 2186 : public is_nothrow_destructible<_Tp> 2187{ 2188}; 2189 2190template <class _Tp> 2191struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 2192 : public true_type 2193{ 2194}; 2195 2196template <class _Tp> 2197struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 2198 : public true_type 2199{ 2200}; 2201 2202#else 2203 2204template <class _Tp> struct __libcpp_nothrow_destructor 2205 : public integral_constant<bool, is_scalar<_Tp>::value || 2206 is_reference<_Tp>::value> {}; 2207 2208template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 2209 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 2210 2211template <class _Tp> 2212struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 2213 : public false_type {}; 2214 2215#endif 2216 2217#if _LIBCPP_STD_VER > 14 2218template <class _Tp> 2219inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value; 2220#endif 2221 2222// is_pod 2223 2224#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 2225 2226template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 2227 : public integral_constant<bool, __is_pod(_Tp)> {}; 2228 2229#else 2230 2231template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 2232 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 2233 is_trivially_copy_constructible<_Tp>::value && 2234 is_trivially_copy_assignable<_Tp>::value && 2235 is_trivially_destructible<_Tp>::value> {}; 2236 2237#endif 2238 2239#if _LIBCPP_STD_VER > 14 2240template <class _Tp> 2241inline constexpr bool is_pod_v = is_pod<_Tp>::value; 2242#endif 2243 2244// is_literal_type; 2245 2246#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 2247template <class _Tp> struct _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 is_literal_type 2248 : public integral_constant<bool, __is_literal_type(_Tp)> 2249 {}; 2250 2251#if _LIBCPP_STD_VER > 14 2252template <class _Tp> 2253_LIBCPP_DEPRECATED_IN_CXX17 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value; 2254#endif // _LIBCPP_STD_VER > 14 2255#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 2256 2257// is_standard_layout; 2258 2259template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 2260#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 2261 : public integral_constant<bool, __is_standard_layout(_Tp)> 2262#else 2263 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 2264#endif 2265 {}; 2266 2267#if _LIBCPP_STD_VER > 14 2268template <class _Tp> 2269inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value; 2270#endif 2271 2272// is_trivially_copyable; 2273 2274template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 2275 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 2276 {}; 2277 2278#if _LIBCPP_STD_VER > 14 2279template <class _Tp> 2280inline constexpr bool is_trivially_copyable_v = is_trivially_copyable<_Tp>::value; 2281#endif 2282 2283// is_trivial; 2284 2285template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 2286#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 2287 : public integral_constant<bool, __is_trivial(_Tp)> 2288#else 2289 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 2290 is_trivially_default_constructible<_Tp>::value> 2291#endif 2292 {}; 2293 2294#if _LIBCPP_STD_VER > 14 2295template <class _Tp> 2296inline constexpr bool is_trivial_v = is_trivial<_Tp>::value; 2297#endif 2298 2299 2300#ifndef _LIBCPP_CXX03_LANG 2301 2302template <class _Fp, class _A0, 2303 class _DecayFp = typename decay<_Fp>::type, 2304 class _DecayA0 = typename decay<_A0>::type, 2305 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 2306using __enable_if_bullet1 = typename enable_if 2307 < 2308 is_member_function_pointer<_DecayFp>::value 2309 && is_base_of<_ClassT, _DecayA0>::value 2310 >::type; 2311 2312template <class _Fp, class _A0, 2313 class _DecayFp = typename decay<_Fp>::type, 2314 class _DecayA0 = typename decay<_A0>::type> 2315using __enable_if_bullet2 = typename enable_if 2316 < 2317 is_member_function_pointer<_DecayFp>::value 2318 && __is_reference_wrapper<_DecayA0>::value 2319 >::type; 2320 2321template <class _Fp, class _A0, 2322 class _DecayFp = typename decay<_Fp>::type, 2323 class _DecayA0 = typename decay<_A0>::type, 2324 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 2325using __enable_if_bullet3 = typename enable_if 2326 < 2327 is_member_function_pointer<_DecayFp>::value 2328 && !is_base_of<_ClassT, _DecayA0>::value 2329 && !__is_reference_wrapper<_DecayA0>::value 2330 >::type; 2331 2332template <class _Fp, class _A0, 2333 class _DecayFp = typename decay<_Fp>::type, 2334 class _DecayA0 = typename decay<_A0>::type, 2335 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 2336using __enable_if_bullet4 = typename enable_if 2337 < 2338 is_member_object_pointer<_DecayFp>::value 2339 && is_base_of<_ClassT, _DecayA0>::value 2340 >::type; 2341 2342template <class _Fp, class _A0, 2343 class _DecayFp = typename decay<_Fp>::type, 2344 class _DecayA0 = typename decay<_A0>::type> 2345using __enable_if_bullet5 = typename enable_if 2346 < 2347 is_member_object_pointer<_DecayFp>::value 2348 && __is_reference_wrapper<_DecayA0>::value 2349 >::type; 2350 2351template <class _Fp, class _A0, 2352 class _DecayFp = typename decay<_Fp>::type, 2353 class _DecayA0 = typename decay<_A0>::type, 2354 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 2355using __enable_if_bullet6 = typename enable_if 2356 < 2357 is_member_object_pointer<_DecayFp>::value 2358 && !is_base_of<_ClassT, _DecayA0>::value 2359 && !__is_reference_wrapper<_DecayA0>::value 2360 >::type; 2361 2362// __invoke forward declarations 2363 2364// fall back - none of the bullets 2365 2366template <class ..._Args> 2367auto __invoke(__any, _Args&& ...__args) -> __nat; 2368 2369// bullets 1, 2 and 3 2370 2371template <class _Fp, class _A0, class ..._Args, 2372 class = __enable_if_bullet1<_Fp, _A0>> 2373inline _LIBCPP_INLINE_VISIBILITY 2374constexpr auto 2375__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 2376 noexcept(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...))) 2377 -> decltype( (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)) 2378 { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); } 2379 2380template <class _Fp, class _A0, class ..._Args, 2381 class = __enable_if_bullet2<_Fp, _A0>> 2382inline _LIBCPP_INLINE_VISIBILITY 2383constexpr auto 2384__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 2385 noexcept(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...))) 2386 -> decltype( (__a0.get().*__f)(static_cast<_Args&&>(__args)...)) 2387 { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); } 2388 2389template <class _Fp, class _A0, class ..._Args, 2390 class = __enable_if_bullet3<_Fp, _A0>> 2391inline _LIBCPP_INLINE_VISIBILITY 2392constexpr auto 2393__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 2394 noexcept(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...))) 2395 -> decltype( ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)) 2396 { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); } 2397 2398// bullets 4, 5 and 6 2399 2400template <class _Fp, class _A0, 2401 class = __enable_if_bullet4<_Fp, _A0>> 2402inline _LIBCPP_INLINE_VISIBILITY 2403constexpr auto 2404__invoke(_Fp&& __f, _A0&& __a0) 2405 noexcept(noexcept(static_cast<_A0&&>(__a0).*__f)) 2406 -> decltype( static_cast<_A0&&>(__a0).*__f) 2407 { return static_cast<_A0&&>(__a0).*__f; } 2408 2409template <class _Fp, class _A0, 2410 class = __enable_if_bullet5<_Fp, _A0>> 2411inline _LIBCPP_INLINE_VISIBILITY 2412constexpr auto 2413__invoke(_Fp&& __f, _A0&& __a0) 2414 noexcept(noexcept(__a0.get().*__f)) 2415 -> decltype( __a0.get().*__f) 2416 { return __a0.get().*__f; } 2417 2418template <class _Fp, class _A0, 2419 class = __enable_if_bullet6<_Fp, _A0>> 2420inline _LIBCPP_INLINE_VISIBILITY 2421constexpr auto 2422__invoke(_Fp&& __f, _A0&& __a0) 2423 noexcept(noexcept((*static_cast<_A0&&>(__a0)).*__f)) 2424 -> decltype( (*static_cast<_A0&&>(__a0)).*__f) 2425 { return (*static_cast<_A0&&>(__a0)).*__f; } 2426 2427// bullet 7 2428 2429template <class _Fp, class ..._Args> 2430inline _LIBCPP_INLINE_VISIBILITY 2431constexpr auto 2432__invoke(_Fp&& __f, _Args&& ...__args) 2433 noexcept(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...))) 2434 -> decltype( static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)) 2435 { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); } 2436 2437// __invokable 2438template <class _Ret, class _Fp, class ..._Args> 2439struct __invokable_r 2440{ 2441 template <class _XFp, class ..._XArgs> 2442 static auto __try_call(int) -> decltype( 2443 _VSTD::__invoke(declval<_XFp>(), declval<_XArgs>()...)); 2444 template <class _XFp, class ..._XArgs> 2445 static __nat __try_call(...); 2446 2447 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 2448 // or incomplete array types as required by the standard. 2449 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 2450 2451 using type = typename conditional< 2452 _IsNotSame<_Result, __nat>::value, 2453 typename conditional< is_void<_Ret>::value, true_type, __is_core_convertible<_Result, _Ret> >::type, 2454 false_type >::type; 2455 static const bool value = type::value; 2456}; 2457template <class _Fp, class ..._Args> 2458using __invokable = __invokable_r<void, _Fp, _Args...>; 2459 2460template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 2461struct __nothrow_invokable_r_imp { 2462 static const bool value = false; 2463}; 2464 2465template <class _Ret, class _Fp, class ..._Args> 2466struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 2467{ 2468 typedef __nothrow_invokable_r_imp _ThisT; 2469 2470 template <class _Tp> 2471 static void __test_noexcept(_Tp) noexcept; 2472 2473 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 2474 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...))); 2475}; 2476 2477template <class _Ret, class _Fp, class ..._Args> 2478struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 2479{ 2480 static const bool value = noexcept( 2481 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...)); 2482}; 2483 2484template <class _Ret, class _Fp, class ..._Args> 2485using __nothrow_invokable_r = 2486 __nothrow_invokable_r_imp< 2487 __invokable_r<_Ret, _Fp, _Args...>::value, 2488 is_void<_Ret>::value, 2489 _Ret, _Fp, _Args... 2490 >; 2491 2492template <class _Fp, class ..._Args> 2493using __nothrow_invokable = 2494 __nothrow_invokable_r_imp< 2495 __invokable<_Fp, _Args...>::value, 2496 true, void, _Fp, _Args... 2497 >; 2498 2499template <class _Fp, class ..._Args> 2500struct __invoke_of 2501 : public enable_if< 2502 __invokable<_Fp, _Args...>::value, 2503 typename __invokable_r<void, _Fp, _Args...>::_Result> 2504{ 2505}; 2506 2507#else 2508 2509// Assume that it's a functor in C++03 2510template <class _Func, class... _Args> 2511_LIBCPP_HIDE_FROM_ABI 2512decltype(std::declval<_Func>()(std::declval<_Args>()...)) __invoke(_Func&& __func, _Args&&... __args) { 2513 return static_cast<_Func&&>(__func)(static_cast<_Args&&>(__args)...); 2514} 2515 2516#endif // _LIBCPP_CXX03_LANG 2517 2518// result_of 2519 2520#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 2521template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 2522 2523#ifndef _LIBCPP_CXX03_LANG 2524 2525template <class _Fp, class ..._Args> 2526class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 2527 : public __invoke_of<_Fp, _Args...> 2528{ 2529}; 2530 2531#else // C++03 2532 2533template <class _Fn, bool, bool> 2534class __result_of 2535{ 2536}; 2537 2538template <class _Fn, class ..._Args> 2539class __result_of<_Fn(_Args...), true, false> 2540{ 2541public: 2542 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 2543}; 2544 2545template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 2546struct __result_of_mp; 2547 2548// member function pointer 2549 2550template <class _MP, class _Tp> 2551struct __result_of_mp<_MP, _Tp, true> 2552{ 2553 using type = typename __member_pointer_traits<_MP>::_ReturnType; 2554}; 2555 2556// member data pointer 2557 2558template <class _MP, class _Tp, bool> 2559struct __result_of_mdp; 2560 2561template <class _Rp, class _Class, class _Tp> 2562struct __result_of_mdp<_Rp _Class::*, _Tp, false> 2563{ 2564 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 2565}; 2566 2567template <class _Rp, class _Class, class _Tp> 2568struct __result_of_mdp<_Rp _Class::*, _Tp, true> 2569{ 2570 using type = typename __apply_cv<_Tp, _Rp>::type&; 2571}; 2572 2573template <class _Rp, class _Class, class _Tp> 2574struct __result_of_mp<_Rp _Class::*, _Tp, false> 2575 : public __result_of_mdp<_Rp _Class::*, _Tp, 2576 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 2577{ 2578}; 2579 2580template <class _Fn, class _Tp> 2581class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 2582 : public __result_of_mp<typename remove_reference<_Fn>::type, 2583 _Tp, 2584 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2585{ 2586}; 2587 2588template <class _Fn, class _Tp, class ..._Args> 2589class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 2590 : public __result_of_mp<typename remove_reference<_Fn>::type, 2591 _Tp, 2592 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2593{ 2594}; 2595 2596template <class _Fn, class ..._Args> 2597class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 2598 : public __result_of<_Fn(_Args...), 2599 is_class<typename remove_reference<_Fn>::type>::value || 2600 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2601 is_member_pointer<typename remove_reference<_Fn>::type>::value 2602 > 2603{ 2604}; 2605 2606#endif // C++03 2607 2608#if _LIBCPP_STD_VER > 11 2609template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 2610#endif // _LIBCPP_STD_VER > 11 2611#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 2612 2613#if _LIBCPP_STD_VER > 14 2614 2615// invoke_result 2616 2617template <class _Fn, class... _Args> 2618struct _LIBCPP_TEMPLATE_VIS invoke_result 2619 : __invoke_of<_Fn, _Args...> 2620{ 2621}; 2622 2623template <class _Fn, class... _Args> 2624using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 2625 2626// is_invocable 2627 2628template <class _Fn, class ..._Args> 2629struct _LIBCPP_TEMPLATE_VIS is_invocable 2630 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 2631 2632template <class _Ret, class _Fn, class ..._Args> 2633struct _LIBCPP_TEMPLATE_VIS is_invocable_r 2634 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 2635 2636template <class _Fn, class ..._Args> 2637inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; 2638 2639template <class _Ret, class _Fn, class ..._Args> 2640inline constexpr bool is_invocable_r_v = is_invocable_r<_Ret, _Fn, _Args...>::value; 2641 2642// is_nothrow_invocable 2643 2644template <class _Fn, class ..._Args> 2645struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 2646 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 2647 2648template <class _Ret, class _Fn, class ..._Args> 2649struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 2650 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 2651 2652template <class _Fn, class ..._Args> 2653inline constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<_Fn, _Args...>::value; 2654 2655template <class _Ret, class _Fn, class ..._Args> 2656inline constexpr bool is_nothrow_invocable_r_v = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 2657 2658#endif // _LIBCPP_STD_VER > 14 2659 2660// __swappable 2661 2662template <class _Tp> struct __is_swappable; 2663template <class _Tp> struct __is_nothrow_swappable; 2664 2665 2666#ifndef _LIBCPP_CXX03_LANG 2667template <class _Tp> 2668using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 2669#else 2670template <class> 2671using __swap_result_t = void; 2672#endif 2673 2674template <class _Tp> 2675inline _LIBCPP_INLINE_VISIBILITY 2676_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 2677swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 2678 is_nothrow_move_assignable<_Tp>::value); 2679 2680template<class _Tp, size_t _Np> 2681inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 2682typename enable_if< 2683 __is_swappable<_Tp>::value 2684>::type 2685swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 2686 2687namespace __detail 2688{ 2689// ALL generic swap overloads MUST already have a declaration available at this point. 2690 2691template <class _Tp, class _Up = _Tp, 2692 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 2693struct __swappable_with 2694{ 2695 template <class _LHS, class _RHS> 2696 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 2697 __test_swap(int); 2698 template <class, class> 2699 static __nat __test_swap(long); 2700 2701 // Extra parens are needed for the C++03 definition of decltype. 2702 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 2703 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 2704 2705 static const bool value = _IsNotSame<__swap1, __nat>::value 2706 && _IsNotSame<__swap2, __nat>::value; 2707}; 2708 2709template <class _Tp, class _Up> 2710struct __swappable_with<_Tp, _Up, false> : false_type {}; 2711 2712template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 2713struct __nothrow_swappable_with { 2714 static const bool value = 2715#ifndef _LIBCPP_HAS_NO_NOEXCEPT 2716 noexcept(swap(declval<_Tp>(), declval<_Up>())) 2717 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 2718#else 2719 false; 2720#endif 2721}; 2722 2723template <class _Tp, class _Up> 2724struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 2725 2726} // namespace __detail 2727 2728template <class _Tp> 2729struct __is_swappable 2730 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 2731{ 2732}; 2733 2734template <class _Tp> 2735struct __is_nothrow_swappable 2736 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 2737{ 2738}; 2739 2740#if _LIBCPP_STD_VER > 14 2741 2742template <class _Tp, class _Up> 2743struct _LIBCPP_TEMPLATE_VIS is_swappable_with 2744 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 2745{ 2746}; 2747 2748template <class _Tp> 2749struct _LIBCPP_TEMPLATE_VIS is_swappable 2750 : public conditional< 2751 __is_referenceable<_Tp>::value, 2752 is_swappable_with< 2753 typename add_lvalue_reference<_Tp>::type, 2754 typename add_lvalue_reference<_Tp>::type>, 2755 false_type 2756 >::type 2757{ 2758}; 2759 2760template <class _Tp, class _Up> 2761struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 2762 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 2763{ 2764}; 2765 2766template <class _Tp> 2767struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 2768 : public conditional< 2769 __is_referenceable<_Tp>::value, 2770 is_nothrow_swappable_with< 2771 typename add_lvalue_reference<_Tp>::type, 2772 typename add_lvalue_reference<_Tp>::type>, 2773 false_type 2774 >::type 2775{ 2776}; 2777 2778template <class _Tp, class _Up> 2779inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 2780 2781template <class _Tp> 2782inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 2783 2784template <class _Tp, class _Up> 2785inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 2786 2787template <class _Tp> 2788inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 2789 2790#endif // _LIBCPP_STD_VER > 14 2791 2792template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 2793 2794template <class _Tp> 2795struct __underlying_type_impl<_Tp, false> {}; 2796 2797template <class _Tp> 2798struct __underlying_type_impl<_Tp, true> 2799{ 2800 typedef __underlying_type(_Tp) type; 2801}; 2802 2803template <class _Tp> 2804struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 2805 2806#if _LIBCPP_STD_VER > 11 2807template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 2808#endif 2809 2810template <class _Tp, bool = is_enum<_Tp>::value> 2811struct __sfinae_underlying_type 2812{ 2813 typedef typename underlying_type<_Tp>::type type; 2814 typedef decltype(((type)1) + 0) __promoted_type; 2815}; 2816 2817template <class _Tp> 2818struct __sfinae_underlying_type<_Tp, false> {}; 2819 2820inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2821int __convert_to_integral(int __val) { return __val; } 2822 2823inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2824unsigned __convert_to_integral(unsigned __val) { return __val; } 2825 2826inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2827long __convert_to_integral(long __val) { return __val; } 2828 2829inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2830unsigned long __convert_to_integral(unsigned long __val) { return __val; } 2831 2832inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2833long long __convert_to_integral(long long __val) { return __val; } 2834 2835inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2836unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 2837 2838template<typename _Fp> 2839inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2840typename enable_if<is_floating_point<_Fp>::value, long long>::type 2841 __convert_to_integral(_Fp __val) { return __val; } 2842 2843#ifndef _LIBCPP_HAS_NO_INT128 2844inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2845__int128_t __convert_to_integral(__int128_t __val) { return __val; } 2846 2847inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2848__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 2849#endif 2850 2851template <class _Tp> 2852inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2853typename __sfinae_underlying_type<_Tp>::__promoted_type 2854__convert_to_integral(_Tp __val) { return __val; } 2855 2856// is_scoped_enum [meta.unary.prop] 2857 2858#if _LIBCPP_STD_VER > 20 2859template <class _Tp, bool = is_enum_v<_Tp> > 2860struct __is_scoped_enum_helper : false_type {}; 2861 2862template <class _Tp> 2863struct __is_scoped_enum_helper<_Tp, true> 2864 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 2865 2866template <class _Tp> 2867struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 2868 : public __is_scoped_enum_helper<_Tp> {}; 2869 2870template <class _Tp> 2871inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; 2872#endif 2873 2874#if _LIBCPP_STD_VER > 14 2875 2876template <class... _Args> 2877struct conjunction : _And<_Args...> {}; 2878template<class... _Args> 2879inline constexpr bool conjunction_v = conjunction<_Args...>::value; 2880 2881template <class... _Args> 2882struct disjunction : _Or<_Args...> {}; 2883template<class... _Args> 2884inline constexpr bool disjunction_v = disjunction<_Args...>::value; 2885 2886template <class _Tp> 2887struct negation : _Not<_Tp> {}; 2888template<class _Tp> 2889inline constexpr bool negation_v = negation<_Tp>::value; 2890#endif // _LIBCPP_STD_VER > 14 2891 2892// These traits are used in __tree and __hash_table 2893struct __extract_key_fail_tag {}; 2894struct __extract_key_self_tag {}; 2895struct __extract_key_first_tag {}; 2896 2897template <class _ValTy, class _Key, 2898 class _RawValTy = typename __unconstref<_ValTy>::type> 2899struct __can_extract_key 2900 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 2901 __extract_key_fail_tag>::type {}; 2902 2903template <class _Pair, class _Key, class _First, class _Second> 2904struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 2905 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 2906 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 2907 2908// __can_extract_map_key uses true_type/false_type instead of the tags. 2909// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 2910// and _ValTy == _Key. 2911template <class _ValTy, class _Key, class _ContainerValueTy, 2912 class _RawValTy = typename __unconstref<_ValTy>::type> 2913struct __can_extract_map_key 2914 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 2915 2916// This specialization returns __extract_key_fail_tag for non-map containers 2917// because _Key == _ContainerValueTy 2918template <class _ValTy, class _Key, class _RawValTy> 2919struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 2920 : false_type {}; 2921 2922#if _LIBCPP_STD_VER > 17 2923_LIBCPP_INLINE_VISIBILITY 2924inline constexpr bool is_constant_evaluated() noexcept { 2925 return __builtin_is_constant_evaluated(); 2926} 2927#endif 2928 2929inline _LIBCPP_CONSTEXPR 2930bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 2931 2932template <class _CharT> 2933using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 2934 2935template<class _Tp> 2936using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 2937 2938#if _LIBCPP_STD_VER > 17 2939template<bool _Const, class _Tp> 2940using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 2941#endif // _LIBCPP_STD_VER > 17 2942 2943_LIBCPP_END_NAMESPACE_STD 2944 2945#endif // _LIBCPP_TYPE_TRAITS 2946