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