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 <__functional/invoke.h> 422#include <__type_traits/add_const.h> 423#include <__type_traits/add_cv.h> 424#include <__type_traits/add_lvalue_reference.h> 425#include <__type_traits/add_pointer.h> 426#include <__type_traits/add_rvalue_reference.h> 427#include <__type_traits/add_volatile.h> 428#include <__type_traits/alignment_of.h> 429#include <__type_traits/apply_cv.h> 430#include <__type_traits/conditional.h> 431#include <__type_traits/conjunction.h> 432#include <__type_traits/decay.h> 433#include <__type_traits/disjunction.h> 434#include <__type_traits/enable_if.h> 435#include <__type_traits/extent.h> 436#include <__type_traits/has_unique_object_representation.h> 437#include <__type_traits/has_virtual_destructor.h> 438#include <__type_traits/integral_constant.h> 439#include <__type_traits/is_abstract.h> 440#include <__type_traits/is_aggregate.h> 441#include <__type_traits/is_arithmetic.h> 442#include <__type_traits/is_array.h> 443#include <__type_traits/is_assignable.h> 444#include <__type_traits/is_base_of.h> 445#include <__type_traits/is_bounded_array.h> 446#include <__type_traits/is_callable.h> 447#include <__type_traits/is_class.h> 448#include <__type_traits/is_compound.h> 449#include <__type_traits/is_const.h> 450#include <__type_traits/is_constant_evaluated.h> 451#include <__type_traits/is_constructible.h> 452#include <__type_traits/is_convertible.h> 453#include <__type_traits/is_copy_assignable.h> 454#include <__type_traits/is_copy_constructible.h> 455#include <__type_traits/is_default_constructible.h> 456#include <__type_traits/is_destructible.h> 457#include <__type_traits/is_empty.h> 458#include <__type_traits/is_enum.h> 459#include <__type_traits/is_final.h> 460#include <__type_traits/is_floating_point.h> 461#include <__type_traits/is_function.h> 462#include <__type_traits/is_fundamental.h> 463#include <__type_traits/is_integral.h> 464#include <__type_traits/is_literal_type.h> 465#include <__type_traits/is_member_function_pointer.h> 466#include <__type_traits/is_member_object_pointer.h> 467#include <__type_traits/is_member_pointer.h> 468#include <__type_traits/is_move_assignable.h> 469#include <__type_traits/is_move_constructible.h> 470#include <__type_traits/is_nothrow_assignable.h> 471#include <__type_traits/is_nothrow_constructible.h> 472#include <__type_traits/is_nothrow_copy_assignable.h> 473#include <__type_traits/is_nothrow_copy_constructible.h> 474#include <__type_traits/is_nothrow_default_constructible.h> 475#include <__type_traits/is_nothrow_destructible.h> 476#include <__type_traits/is_nothrow_move_assignable.h> 477#include <__type_traits/is_nothrow_move_constructible.h> 478#include <__type_traits/is_null_pointer.h> 479#include <__type_traits/is_object.h> 480#include <__type_traits/is_pod.h> 481#include <__type_traits/is_pointer.h> 482#include <__type_traits/is_polymorphic.h> 483#include <__type_traits/is_reference.h> 484#include <__type_traits/is_reference_wrapper.h> 485#include <__type_traits/is_referenceable.h> 486#include <__type_traits/is_same.h> 487#include <__type_traits/is_scalar.h> 488#include <__type_traits/is_scoped_enum.h> 489#include <__type_traits/is_signed.h> 490#include <__type_traits/is_standard_layout.h> 491#include <__type_traits/is_trivial.h> 492#include <__type_traits/is_trivially_assignable.h> 493#include <__type_traits/is_trivially_constructible.h> 494#include <__type_traits/is_trivially_copy_assignable.h> 495#include <__type_traits/is_trivially_copy_constructible.h> 496#include <__type_traits/is_trivially_copyable.h> 497#include <__type_traits/is_trivially_default_constructible.h> 498#include <__type_traits/is_trivially_destructible.h> 499#include <__type_traits/is_trivially_move_assignable.h> 500#include <__type_traits/is_trivially_move_constructible.h> 501#include <__type_traits/is_unbounded_array.h> 502#include <__type_traits/is_union.h> 503#include <__type_traits/is_unsigned.h> 504#include <__type_traits/is_void.h> 505#include <__type_traits/is_volatile.h> 506#include <__type_traits/negation.h> 507#include <__type_traits/rank.h> 508#include <__type_traits/remove_all_extents.h> 509#include <__type_traits/remove_const.h> 510#include <__type_traits/remove_cv.h> 511#include <__type_traits/remove_extent.h> 512#include <__type_traits/remove_pointer.h> 513#include <__type_traits/remove_reference.h> 514#include <__type_traits/remove_volatile.h> 515#include <__type_traits/type_identity.h> 516#include <__type_traits/underlying_type.h> 517#include <__type_traits/void_t.h> 518#include <__utility/declval.h> 519#include <cstddef> 520#include <cstdint> 521#include <version> 522 523#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 524# pragma GCC system_header 525#endif 526 527_LIBCPP_BEGIN_NAMESPACE_STD 528 529template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 530template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 531 532template <bool> struct _MetaBase; 533template <> 534struct _MetaBase<true> { 535 template <class _Tp, class _Up> 536 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 537 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 538 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 539 template <class _First, class...> 540 using _FirstImpl _LIBCPP_NODEBUG = _First; 541 template <class, class _Second, class...> 542 using _SecondImpl _LIBCPP_NODEBUG = _Second; 543 template <class _Result, class _First, class ..._Rest> 544 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 545}; 546 547template <> 548struct _MetaBase<false> { 549 template <class _Tp, class _Up> 550 using _SelectImpl _LIBCPP_NODEBUG = _Up; 551 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 552 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 553 template <class _Result, class ...> 554 using _OrImpl _LIBCPP_NODEBUG = _Result; 555}; 556template <bool _Cond, class _IfRes, class _ElseRes> 557using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 558template <class ..._Rest> 559using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 560template <class ..._Args> 561using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 562template <class ..._Args> 563using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 564 565template <class ...> using __expand_to_true = true_type; 566template <class ..._Pred> 567__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); 568template <class ...> 569false_type __and_helper(...); 570template <class ..._Pred> 571using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 572 573template <template <class...> class _Func, class ..._Args> 574struct _Lazy : _Func<_Args...> {}; 575 576// Member detector base 577 578template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 579true_type __sfinae_test_impl(int); 580template <template <class...> class, class ...> 581false_type __sfinae_test_impl(...); 582 583template <template <class ...> class _Templ, class ..._Args> 584using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 585 586template <class _Tp, bool> 587struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 588 589// is_same 590 591template <class _Tp> 592using __test_for_primary_template = __enable_if_t< 593 _IsSame<_Tp, typename _Tp::__primary_template>::value 594 >; 595template <class _Tp> 596using __is_primary_template = _IsValidExpansion< 597 __test_for_primary_template, _Tp 598 >; 599 600// is_integral 601 602// [basic.fundamental] defines five standard signed integer types; 603// __int128_t is an extended signed integer type. 604// The signed and unsigned integer types, plus bool and the 605// five types with "char" in their name, compose the "integral" types. 606 607template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 608template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 609template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 610template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 611template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 612template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 613#ifndef _LIBCPP_HAS_NO_INT128 614template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 615#endif 616 617template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 618template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 619template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 620template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 621template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 622template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 623#ifndef _LIBCPP_HAS_NO_INT128 624template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 625#endif 626 627template <class _Tp> 628struct __unconstref { 629 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 630}; 631 632template <class _Tp> 633using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type; 634 635// __is_same_uncvref 636 637template <class _Tp, class _Up> 638struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {}; 639 640#if _LIBCPP_STD_VER > 17 641// remove_cvref - same as __uncvref 642template <class _Tp> 643struct remove_cvref { 644 using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>; 645}; 646 647template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 648#endif 649 650// is_nothrow_convertible 651 652#if _LIBCPP_STD_VER > 17 653 654template <typename _Tp> 655static void __test_noexcept(_Tp) noexcept; 656 657template<typename _Fm, typename _To> 658static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 659__is_nothrow_convertible_test(); 660 661template <typename _Fm, typename _To> 662struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 663{ }; 664 665template <typename _Fm, typename _To> 666struct is_nothrow_convertible : _Or< 667 _And<is_void<_To>, is_void<_Fm>>, 668 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 669>::type { }; 670 671template <typename _Fm, typename _To> 672inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 673 674#endif // _LIBCPP_STD_VER > 17 675 676// aligned_storage 677 678template <class _Hp, class _Tp> 679struct __type_list 680{ 681 typedef _Hp _Head; 682 typedef _Tp _Tail; 683}; 684 685template <class _Tp> 686struct __align_type 687{ 688 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 689 typedef _Tp type; 690}; 691 692struct __struct_double {long double __lx;}; 693struct __struct_double4 {double __lx[4];}; 694 695typedef 696 __type_list<__align_type<unsigned char>, 697 __type_list<__align_type<unsigned short>, 698 __type_list<__align_type<unsigned int>, 699 __type_list<__align_type<unsigned long>, 700 __type_list<__align_type<unsigned long long>, 701 __type_list<__align_type<double>, 702 __type_list<__align_type<long double>, 703 __type_list<__align_type<__struct_double>, 704 __type_list<__align_type<__struct_double4>, 705 __type_list<__align_type<int*>, 706 __nat 707 > > > > > > > > > > __all_types; 708 709template <size_t _Align> 710struct _ALIGNAS(_Align) __fallback_overaligned {}; 711 712template <class _TL, size_t _Align> struct __find_pod; 713 714template <class _Hp, size_t _Align> 715struct __find_pod<__type_list<_Hp, __nat>, _Align> 716{ 717 typedef typename conditional< 718 _Align == _Hp::value, 719 typename _Hp::type, 720 __fallback_overaligned<_Align> 721 >::type type; 722}; 723 724template <class _Hp, class _Tp, size_t _Align> 725struct __find_pod<__type_list<_Hp, _Tp>, _Align> 726{ 727 typedef typename conditional< 728 _Align == _Hp::value, 729 typename _Hp::type, 730 typename __find_pod<_Tp, _Align>::type 731 >::type type; 732}; 733 734template <class _TL, size_t _Len> struct __find_max_align; 735 736template <class _Hp, size_t _Len> 737struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 738 739template <size_t _Len, size_t _A1, size_t _A2> 740struct __select_align 741{ 742private: 743 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 744 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 745public: 746 static const size_t value = _Len < __max ? __min : __max; 747}; 748 749template <class _Hp, class _Tp, size_t _Len> 750struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 751 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 752 753template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 754struct _LIBCPP_TEMPLATE_VIS aligned_storage 755{ 756 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 757 union type 758 { 759 _Aligner __align; 760 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 761 }; 762}; 763 764#if _LIBCPP_STD_VER > 11 765template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 766 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 767#endif 768 769#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 770template <size_t _Len>\ 771struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 772{\ 773 struct _ALIGNAS(n) type\ 774 {\ 775 unsigned char __lx[(_Len + n - 1)/n * n];\ 776 };\ 777} 778 779_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 780_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 781_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 782_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 783_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 784_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 785_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 786_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 787_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 788_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 789_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 790_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 791_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 792_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 793// PE/COFF does not support alignment beyond 8192 (=0x2000) 794#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 795_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 796#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 797 798#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 799 800 801// aligned_union 802 803template <size_t _I0, size_t ..._In> 804struct __static_max; 805 806template <size_t _I0> 807struct __static_max<_I0> 808{ 809 static const size_t value = _I0; 810}; 811 812template <size_t _I0, size_t _I1, size_t ..._In> 813struct __static_max<_I0, _I1, _In...> 814{ 815 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 816 __static_max<_I1, _In...>::value; 817}; 818 819template <size_t _Len, class _Type0, class ..._Types> 820struct aligned_union 821{ 822 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 823 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 824 static const size_t __len = __static_max<_Len, sizeof(_Type0), 825 sizeof(_Types)...>::value; 826 typedef typename aligned_storage<__len, alignment_value>::type type; 827}; 828 829#if _LIBCPP_STD_VER > 11 830template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 831#endif 832 833template <class _Tp> 834struct __numeric_type 835{ 836 static void __test(...); 837 static float __test(float); 838 static double __test(char); 839 static double __test(int); 840 static double __test(unsigned); 841 static double __test(long); 842 static double __test(unsigned long); 843 static double __test(long long); 844 static double __test(unsigned long long); 845 static double __test(double); 846 static long double __test(long double); 847 848 typedef decltype(__test(declval<_Tp>())) type; 849 static const bool value = _IsNotSame<type, void>::value; 850}; 851 852template <> 853struct __numeric_type<void> 854{ 855 static const bool value = true; 856}; 857 858// __promote 859 860template <class _A1, class _A2 = void, class _A3 = void, 861 bool = __numeric_type<_A1>::value && 862 __numeric_type<_A2>::value && 863 __numeric_type<_A3>::value> 864class __promote_imp 865{ 866public: 867 static const bool value = false; 868}; 869 870template <class _A1, class _A2, class _A3> 871class __promote_imp<_A1, _A2, _A3, true> 872{ 873private: 874 typedef typename __promote_imp<_A1>::type __type1; 875 typedef typename __promote_imp<_A2>::type __type2; 876 typedef typename __promote_imp<_A3>::type __type3; 877public: 878 typedef decltype(__type1() + __type2() + __type3()) type; 879 static const bool value = true; 880}; 881 882template <class _A1, class _A2> 883class __promote_imp<_A1, _A2, void, true> 884{ 885private: 886 typedef typename __promote_imp<_A1>::type __type1; 887 typedef typename __promote_imp<_A2>::type __type2; 888public: 889 typedef decltype(__type1() + __type2()) type; 890 static const bool value = true; 891}; 892 893template <class _A1> 894class __promote_imp<_A1, void, void, true> 895{ 896public: 897 typedef typename __numeric_type<_A1>::type type; 898 static const bool value = true; 899}; 900 901template <class _A1, class _A2 = void, class _A3 = void> 902class __promote : public __promote_imp<_A1, _A2, _A3> {}; 903 904// make_signed / make_unsigned 905 906typedef 907 __type_list<signed char, 908 __type_list<signed short, 909 __type_list<signed int, 910 __type_list<signed long, 911 __type_list<signed long long, 912#ifndef _LIBCPP_HAS_NO_INT128 913 __type_list<__int128_t, 914#endif 915 __nat 916#ifndef _LIBCPP_HAS_NO_INT128 917 > 918#endif 919 > > > > > __signed_types; 920 921typedef 922 __type_list<unsigned char, 923 __type_list<unsigned short, 924 __type_list<unsigned int, 925 __type_list<unsigned long, 926 __type_list<unsigned long long, 927#ifndef _LIBCPP_HAS_NO_INT128 928 __type_list<__uint128_t, 929#endif 930 __nat 931#ifndef _LIBCPP_HAS_NO_INT128 932 > 933#endif 934 > > > > > __unsigned_types; 935 936template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 937 938template <class _Hp, class _Tp, size_t _Size> 939struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 940{ 941 typedef _LIBCPP_NODEBUG _Hp type; 942}; 943 944template <class _Hp, class _Tp, size_t _Size> 945struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 946{ 947 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 948}; 949 950template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 951struct __make_signed {}; 952 953template <class _Tp> 954struct __make_signed<_Tp, true> 955{ 956 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 957}; 958 959template <> struct __make_signed<bool, true> {}; 960template <> struct __make_signed< signed short, true> {typedef short type;}; 961template <> struct __make_signed<unsigned short, true> {typedef short type;}; 962template <> struct __make_signed< signed int, true> {typedef int type;}; 963template <> struct __make_signed<unsigned int, true> {typedef int type;}; 964template <> struct __make_signed< signed long, true> {typedef long type;}; 965template <> struct __make_signed<unsigned long, true> {typedef long type;}; 966template <> struct __make_signed< signed long long, true> {typedef long long type;}; 967template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 968#ifndef _LIBCPP_HAS_NO_INT128 969template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 970template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 971#endif 972 973template <class _Tp> 974struct _LIBCPP_TEMPLATE_VIS make_signed 975{ 976 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 977}; 978 979#if _LIBCPP_STD_VER > 11 980template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 981#endif 982 983template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 984struct __make_unsigned {}; 985 986template <class _Tp> 987struct __make_unsigned<_Tp, true> 988{ 989 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 990}; 991 992template <> struct __make_unsigned<bool, true> {}; 993template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 994template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 995template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 996template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 997template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 998template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 999template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 1000template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 1001#ifndef _LIBCPP_HAS_NO_INT128 1002template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 1003template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 1004#endif 1005 1006template <class _Tp> 1007struct _LIBCPP_TEMPLATE_VIS make_unsigned 1008{ 1009 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 1010}; 1011 1012#if _LIBCPP_STD_VER > 11 1013template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 1014#endif 1015 1016#ifndef _LIBCPP_CXX03_LANG 1017template <class _Tp> 1018_LIBCPP_HIDE_FROM_ABI constexpr 1019typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 1020 return static_cast<typename make_unsigned<_Tp>::type>(__x); 1021} 1022#endif 1023 1024template <class _Tp, class _Up> 1025using __copy_unsigned_t = __conditional_t<is_unsigned<_Tp>::value, typename make_unsigned<_Up>::type, _Up>; 1026 1027/// Helper to promote an integral to smallest 32, 64, or 128 bit representation. 1028/// 1029/// The restriction is the same as the integral version of to_char. 1030template <class _Tp> 1031#if _LIBCPP_STD_VER > 17 1032 requires (is_signed_v<_Tp> || is_unsigned_v<_Tp> || is_same_v<_Tp, char>) 1033#endif 1034using __make_32_64_or_128_bit_t = 1035 __copy_unsigned_t<_Tp, 1036 __conditional_t<sizeof(_Tp) <= sizeof(int32_t), int32_t, 1037 __conditional_t<sizeof(_Tp) <= sizeof(int64_t), int64_t, 1038#ifndef _LIBCPP_HAS_NO_INT128 1039 __conditional_t<sizeof(_Tp) <= sizeof(__int128_t), __int128_t, 1040 /* else */ void> 1041#else 1042 /* else */ void 1043#endif 1044 > > 1045 >; 1046 1047#if _LIBCPP_STD_VER > 17 1048// Let COND_RES(X, Y) be: 1049template <class _Tp, class _Up> 1050using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 1051 1052template <class _Tp, class _Up, class = void> 1053struct __common_type3 {}; 1054 1055// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 1056template <class _Tp, class _Up> 1057struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 1058{ 1059 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 1060}; 1061 1062template <class _Tp, class _Up, class = void> 1063struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 1064#else 1065template <class _Tp, class _Up, class = void> 1066struct __common_type2_imp {}; 1067#endif 1068 1069// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 1070template <class _Tp, class _Up> 1071struct __common_type2_imp<_Tp, _Up, 1072 typename __void_t<decltype( 1073 true ? declval<_Tp>() : declval<_Up>() 1074 )>::type> 1075{ 1076 typedef _LIBCPP_NODEBUG typename decay<decltype( 1077 true ? declval<_Tp>() : declval<_Up>() 1078 )>::type type; 1079}; 1080 1081template <class, class = void> 1082struct __common_type_impl {}; 1083 1084// Clang provides variadic templates in C++03 as an extension. 1085#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 1086# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 1087template <class... _Tp> 1088struct __common_types; 1089template <class... _Tp> 1090struct _LIBCPP_TEMPLATE_VIS common_type; 1091#else 1092# define _LIBCPP_OPTIONAL_PACK(...) 1093struct __no_arg; 1094template <class _Tp, class _Up, class = __no_arg> 1095struct __common_types; 1096template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 1097 class _Unused = __no_arg> 1098struct common_type { 1099 static_assert(sizeof(_Unused) == 0, 1100 "common_type accepts at most 3 arguments in C++03"); 1101}; 1102#endif // _LIBCPP_CXX03_LANG 1103 1104template <class _Tp, class _Up> 1105struct __common_type_impl< 1106 __common_types<_Tp, _Up>, 1107 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1108{ 1109 typedef typename common_type<_Tp, _Up>::type type; 1110}; 1111 1112template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1113struct __common_type_impl< 1114 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 1115 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1116 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 1117 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 1118}; 1119 1120// bullet 1 - sizeof...(Tp) == 0 1121 1122template <> 1123struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 1124 1125// bullet 2 - sizeof...(Tp) == 1 1126 1127template <class _Tp> 1128struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 1129 : public common_type<_Tp, _Tp> {}; 1130 1131// bullet 3 - sizeof...(Tp) == 2 1132 1133// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 1134template <class _Tp, class _Up> 1135struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 1136 : conditional< 1137 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 1138 __common_type2_imp<_Tp, _Up>, 1139 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 1140 >::type 1141{}; 1142 1143// bullet 4 - sizeof...(Tp) > 2 1144 1145template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1146struct _LIBCPP_TEMPLATE_VIS 1147 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 1148 : __common_type_impl< 1149 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 1150 1151#undef _LIBCPP_OPTIONAL_PACK 1152 1153#if _LIBCPP_STD_VER > 11 1154template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 1155#endif 1156 1157#if _LIBCPP_STD_VER > 11 1158// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 1159// top-level cv-qualifiers. 1160template <class _From, class _To> 1161struct __copy_cv 1162{ 1163 using type = _To; 1164}; 1165 1166template <class _From, class _To> 1167struct __copy_cv<const _From, _To> 1168{ 1169 using type = add_const_t<_To>; 1170}; 1171 1172template <class _From, class _To> 1173struct __copy_cv<volatile _From, _To> 1174{ 1175 using type = add_volatile_t<_To>; 1176}; 1177 1178template <class _From, class _To> 1179struct __copy_cv<const volatile _From, _To> 1180{ 1181 using type = add_cv_t<_To>; 1182}; 1183 1184template <class _From, class _To> 1185using __copy_cv_t = typename __copy_cv<_From, _To>::type; 1186 1187template <class _From, class _To> 1188struct __copy_cvref 1189{ 1190 using type = __copy_cv_t<_From, _To>; 1191}; 1192 1193template <class _From, class _To> 1194struct __copy_cvref<_From&, _To> 1195{ 1196 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 1197}; 1198 1199template <class _From, class _To> 1200struct __copy_cvref<_From&&, _To> 1201{ 1202 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 1203}; 1204 1205template <class _From, class _To> 1206using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 1207 1208#endif // _LIBCPP_STD_VER > 11 1209 1210// common_reference 1211#if _LIBCPP_STD_VER > 17 1212// Let COND_RES(X, Y) be: 1213template <class _Xp, class _Yp> 1214using __cond_res = 1215 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 1216 1217// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 1218// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 1219// `U`. 1220// [Note: `XREF(A)` is `__xref<A>::template __apply`] 1221template <class _Tp> 1222struct __xref { 1223 template<class _Up> 1224 using __apply = __copy_cvref_t<_Tp, _Up>; 1225}; 1226 1227// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 1228// and let COMMON-REF(A, B) be: 1229template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 1230struct __common_ref; 1231 1232template<class _Xp, class _Yp> 1233using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 1234 1235template<class _Xp, class _Yp> 1236using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 1237 1238 1239// If A and B are both lvalue reference types, COMMON-REF(A, B) is 1240// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 1241template<class _Ap, class _Bp, class _Xp, class _Yp> 1242requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 1243struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 1244{ 1245 using __type = __cv_cond_res<_Xp, _Yp>; 1246}; 1247 1248// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 1249template <class _Xp, class _Yp> 1250using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 1251 1252 1253// .... If A and B are both rvalue reference types, C is well-formed, and 1254// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 1255template<class _Ap, class _Bp, class _Xp, class _Yp> 1256requires 1257 requires { typename __common_ref_C<_Xp, _Yp>; } && 1258 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 1259 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 1260struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 1261{ 1262 using __type = __common_ref_C<_Xp, _Yp>; 1263}; 1264 1265// Otherwise, let D be COMMON-REF(const X&, Y&). ... 1266template <class _Tp, class _Up> 1267using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 1268 1269// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 1270// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 1271template<class _Ap, class _Bp, class _Xp, class _Yp> 1272requires requires { typename __common_ref_D<_Xp, _Yp>; } && 1273 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 1274struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 1275{ 1276 using __type = __common_ref_D<_Xp, _Yp>; 1277}; 1278 1279// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 1280// COMMON-REF(A, B) is COMMON-REF(B, A). 1281template<class _Ap, class _Bp, class _Xp, class _Yp> 1282struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 1283 1284// Otherwise, COMMON-REF(A, B) is ill-formed. 1285template<class _Ap, class _Bp, class _Xp, class _Yp> 1286struct __common_ref {}; 1287 1288// Note C: For the common_reference trait applied to a parameter pack [...] 1289 1290template <class...> 1291struct common_reference; 1292 1293template <class... _Types> 1294using common_reference_t = typename common_reference<_Types...>::type; 1295 1296// bullet 1 - sizeof...(T) == 0 1297template<> 1298struct common_reference<> {}; 1299 1300// bullet 2 - sizeof...(T) == 1 1301template <class _Tp> 1302struct common_reference<_Tp> 1303{ 1304 using type = _Tp; 1305}; 1306 1307// bullet 3 - sizeof...(T) == 2 1308template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 1309template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 1310template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 1311 1312// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 1313// the member typedef `type` denotes that type. 1314template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 1315 1316template <class _Tp, class _Up> 1317requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 1318struct __common_reference_sub_bullet1<_Tp, _Up> 1319{ 1320 using type = __common_ref_t<_Tp, _Up>; 1321}; 1322 1323// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 1324// is well-formed, then the member typedef `type` denotes that type. 1325template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 1326 1327template <class _Tp, class _Up> 1328using __basic_common_reference_t = typename basic_common_reference< 1329 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 1330 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 1331 1332template <class _Tp, class _Up> 1333requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 1334struct __common_reference_sub_bullet2<_Tp, _Up> 1335{ 1336 using type = __basic_common_reference_t<_Tp, _Up>; 1337}; 1338 1339// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 1340// then the member typedef `type` denotes that type. 1341template <class _Tp, class _Up> 1342requires requires { typename __cond_res<_Tp, _Up>; } 1343struct __common_reference_sub_bullet3<_Tp, _Up> 1344{ 1345 using type = __cond_res<_Tp, _Up>; 1346}; 1347 1348 1349// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 1350// then the member typedef `type` denotes that type. 1351// - Otherwise, there shall be no member `type`. 1352template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 1353 1354// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 1355// any, as `common_reference_t<C, Rest...>`. 1356template <class _Tp, class _Up, class _Vp, class... _Rest> 1357requires requires { typename common_reference_t<_Tp, _Up>; } 1358struct common_reference<_Tp, _Up, _Vp, _Rest...> 1359 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 1360{}; 1361 1362// bullet 5 - Otherwise, there shall be no member `type`. 1363template <class...> struct common_reference {}; 1364 1365#endif // _LIBCPP_STD_VER > 17 1366 1367#ifndef _LIBCPP_CXX03_LANG 1368// First of all, we can't implement this check in C++03 mode because the {} 1369// default initialization syntax isn't valid. 1370// Second, we implement the trait in a funny manner with two defaulted template 1371// arguments to workaround Clang's PR43454. 1372template <class _Tp> 1373void __test_implicit_default_constructible(_Tp); 1374 1375template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 1376struct __is_implicitly_default_constructible 1377 : false_type 1378{ }; 1379 1380template <class _Tp> 1381struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 1382 : true_type 1383{ }; 1384 1385template <class _Tp> 1386struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 1387 : false_type 1388{ }; 1389#endif // !C++03 1390 1391// result_of 1392 1393#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1394template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 1395 1396#ifndef _LIBCPP_CXX03_LANG 1397 1398template <class _Fp, class ..._Args> 1399class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 1400 : public __invoke_of<_Fp, _Args...> 1401{ 1402}; 1403 1404#else // C++03 1405 1406template <class _Fn, bool, bool> 1407class __result_of 1408{ 1409}; 1410 1411template <class _Fn, class ..._Args> 1412class __result_of<_Fn(_Args...), true, false> 1413{ 1414public: 1415 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 1416}; 1417 1418template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 1419struct __result_of_mp; 1420 1421// member function pointer 1422 1423template <class _MP, class _Tp> 1424struct __result_of_mp<_MP, _Tp, true> 1425{ 1426 using type = typename __member_pointer_traits<_MP>::_ReturnType; 1427}; 1428 1429// member data pointer 1430 1431template <class _MP, class _Tp, bool> 1432struct __result_of_mdp; 1433 1434template <class _Rp, class _Class, class _Tp> 1435struct __result_of_mdp<_Rp _Class::*, _Tp, false> 1436{ 1437 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 1438}; 1439 1440template <class _Rp, class _Class, class _Tp> 1441struct __result_of_mdp<_Rp _Class::*, _Tp, true> 1442{ 1443 using type = typename __apply_cv<_Tp, _Rp>::type&; 1444}; 1445 1446template <class _Rp, class _Class, class _Tp> 1447struct __result_of_mp<_Rp _Class::*, _Tp, false> 1448 : public __result_of_mdp<_Rp _Class::*, _Tp, 1449 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 1450{ 1451}; 1452 1453template <class _Fn, class _Tp> 1454class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 1455 : public __result_of_mp<typename remove_reference<_Fn>::type, 1456 _Tp, 1457 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1458{ 1459}; 1460 1461template <class _Fn, class _Tp, class ..._Args> 1462class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 1463 : public __result_of_mp<typename remove_reference<_Fn>::type, 1464 _Tp, 1465 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1466{ 1467}; 1468 1469template <class _Fn, class ..._Args> 1470class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 1471 : public __result_of<_Fn(_Args...), 1472 is_class<typename remove_reference<_Fn>::type>::value || 1473 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 1474 is_member_pointer<typename remove_reference<_Fn>::type>::value 1475 > 1476{ 1477}; 1478 1479#endif // C++03 1480 1481#if _LIBCPP_STD_VER > 11 1482template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 1483#endif // _LIBCPP_STD_VER > 11 1484#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1485 1486// __swappable 1487 1488template <class _Tp> struct __is_swappable; 1489template <class _Tp> struct __is_nothrow_swappable; 1490 1491 1492#ifndef _LIBCPP_CXX03_LANG 1493template <class _Tp> 1494using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 1495#else 1496template <class> 1497using __swap_result_t = void; 1498#endif 1499 1500template <class _Tp> 1501inline _LIBCPP_INLINE_VISIBILITY 1502_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 1503swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 1504 is_nothrow_move_assignable<_Tp>::value); 1505 1506template<class _Tp, size_t _Np> 1507inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1508typename enable_if< 1509 __is_swappable<_Tp>::value 1510>::type 1511swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 1512 1513namespace __detail 1514{ 1515// ALL generic swap overloads MUST already have a declaration available at this point. 1516 1517template <class _Tp, class _Up = _Tp, 1518 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 1519struct __swappable_with 1520{ 1521 template <class _LHS, class _RHS> 1522 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 1523 __test_swap(int); 1524 template <class, class> 1525 static __nat __test_swap(long); 1526 1527 // Extra parens are needed for the C++03 definition of decltype. 1528 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 1529 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 1530 1531 static const bool value = _IsNotSame<__swap1, __nat>::value 1532 && _IsNotSame<__swap2, __nat>::value; 1533}; 1534 1535template <class _Tp, class _Up> 1536struct __swappable_with<_Tp, _Up, false> : false_type {}; 1537 1538template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 1539struct __nothrow_swappable_with { 1540 static const bool value = 1541#ifndef _LIBCPP_HAS_NO_NOEXCEPT 1542 noexcept(swap(declval<_Tp>(), declval<_Up>())) 1543 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 1544#else 1545 false; 1546#endif 1547}; 1548 1549template <class _Tp, class _Up> 1550struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 1551 1552} // namespace __detail 1553 1554template <class _Tp> 1555struct __is_swappable 1556 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 1557{ 1558}; 1559 1560template <class _Tp> 1561struct __is_nothrow_swappable 1562 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 1563{ 1564}; 1565 1566#if _LIBCPP_STD_VER > 14 1567 1568template <class _Tp, class _Up> 1569struct _LIBCPP_TEMPLATE_VIS is_swappable_with 1570 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 1571{ 1572}; 1573 1574template <class _Tp> 1575struct _LIBCPP_TEMPLATE_VIS is_swappable 1576 : public conditional< 1577 __is_referenceable<_Tp>::value, 1578 is_swappable_with< 1579 typename add_lvalue_reference<_Tp>::type, 1580 typename add_lvalue_reference<_Tp>::type>, 1581 false_type 1582 >::type 1583{ 1584}; 1585 1586template <class _Tp, class _Up> 1587struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 1588 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 1589{ 1590}; 1591 1592template <class _Tp> 1593struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 1594 : public conditional< 1595 __is_referenceable<_Tp>::value, 1596 is_nothrow_swappable_with< 1597 typename add_lvalue_reference<_Tp>::type, 1598 typename add_lvalue_reference<_Tp>::type>, 1599 false_type 1600 >::type 1601{ 1602}; 1603 1604template <class _Tp, class _Up> 1605inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 1606 1607template <class _Tp> 1608inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 1609 1610template <class _Tp, class _Up> 1611inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 1612 1613template <class _Tp> 1614inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 1615 1616#endif // _LIBCPP_STD_VER > 14 1617 1618template <class _Tp, bool = is_enum<_Tp>::value> 1619struct __sfinae_underlying_type 1620{ 1621 typedef typename underlying_type<_Tp>::type type; 1622 typedef decltype(((type)1) + 0) __promoted_type; 1623}; 1624 1625template <class _Tp> 1626struct __sfinae_underlying_type<_Tp, false> {}; 1627 1628inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1629int __convert_to_integral(int __val) { return __val; } 1630 1631inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1632unsigned __convert_to_integral(unsigned __val) { return __val; } 1633 1634inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1635long __convert_to_integral(long __val) { return __val; } 1636 1637inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1638unsigned long __convert_to_integral(unsigned long __val) { return __val; } 1639 1640inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1641long long __convert_to_integral(long long __val) { return __val; } 1642 1643inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1644unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 1645 1646template<typename _Fp> 1647inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1648typename enable_if<is_floating_point<_Fp>::value, long long>::type 1649 __convert_to_integral(_Fp __val) { return __val; } 1650 1651#ifndef _LIBCPP_HAS_NO_INT128 1652inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1653__int128_t __convert_to_integral(__int128_t __val) { return __val; } 1654 1655inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1656__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 1657#endif 1658 1659template <class _Tp> 1660inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1661typename __sfinae_underlying_type<_Tp>::__promoted_type 1662__convert_to_integral(_Tp __val) { return __val; } 1663 1664// These traits are used in __tree and __hash_table 1665struct __extract_key_fail_tag {}; 1666struct __extract_key_self_tag {}; 1667struct __extract_key_first_tag {}; 1668 1669template <class _ValTy, class _Key, 1670 class _RawValTy = typename __unconstref<_ValTy>::type> 1671struct __can_extract_key 1672 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 1673 __extract_key_fail_tag>::type {}; 1674 1675template <class _Pair, class _Key, class _First, class _Second> 1676struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 1677 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 1678 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 1679 1680// __can_extract_map_key uses true_type/false_type instead of the tags. 1681// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 1682// and _ValTy == _Key. 1683template <class _ValTy, class _Key, class _ContainerValueTy, 1684 class _RawValTy = typename __unconstref<_ValTy>::type> 1685struct __can_extract_map_key 1686 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 1687 1688// This specialization returns __extract_key_fail_tag for non-map containers 1689// because _Key == _ContainerValueTy 1690template <class _ValTy, class _Key, class _RawValTy> 1691struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 1692 : false_type {}; 1693 1694template <class _CharT> 1695using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 1696 1697template<class _Tp> 1698using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 1699 1700#if _LIBCPP_STD_VER > 17 1701template<bool _Const, class _Tp> 1702using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 1703#endif // _LIBCPP_STD_VER > 17 1704 1705_LIBCPP_END_NAMESPACE_STD 1706 1707#endif // _LIBCPP_TYPE_TRAITS 1708