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_convertible.h> 452#include <__type_traits/is_copy_assignable.h> 453#include <__type_traits/is_empty.h> 454#include <__type_traits/is_enum.h> 455#include <__type_traits/is_final.h> 456#include <__type_traits/is_floating_point.h> 457#include <__type_traits/is_function.h> 458#include <__type_traits/is_fundamental.h> 459#include <__type_traits/is_integral.h> 460#include <__type_traits/is_literal_type.h> 461#include <__type_traits/is_member_function_pointer.h> 462#include <__type_traits/is_member_object_pointer.h> 463#include <__type_traits/is_member_pointer.h> 464#include <__type_traits/is_move_assignable.h> 465#include <__type_traits/is_null_pointer.h> 466#include <__type_traits/is_object.h> 467#include <__type_traits/is_pod.h> 468#include <__type_traits/is_pointer.h> 469#include <__type_traits/is_polymorphic.h> 470#include <__type_traits/is_reference.h> 471#include <__type_traits/is_reference_wrapper.h> 472#include <__type_traits/is_referenceable.h> 473#include <__type_traits/is_same.h> 474#include <__type_traits/is_scalar.h> 475#include <__type_traits/is_scoped_enum.h> 476#include <__type_traits/is_signed.h> 477#include <__type_traits/is_standard_layout.h> 478#include <__type_traits/is_trivial.h> 479#include <__type_traits/is_trivially_copyable.h> 480#include <__type_traits/is_unbounded_array.h> 481#include <__type_traits/is_union.h> 482#include <__type_traits/is_unsigned.h> 483#include <__type_traits/is_void.h> 484#include <__type_traits/is_volatile.h> 485#include <__type_traits/rank.h> 486#include <__type_traits/remove_all_extents.h> 487#include <__type_traits/remove_const.h> 488#include <__type_traits/remove_cv.h> 489#include <__type_traits/remove_extent.h> 490#include <__type_traits/remove_pointer.h> 491#include <__type_traits/remove_reference.h> 492#include <__type_traits/remove_volatile.h> 493#include <__type_traits/type_identity.h> 494#include <__type_traits/underlying_type.h> 495#include <__utility/declval.h> 496#include <cstddef> 497#include <version> 498 499#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 500# pragma GCC system_header 501#endif 502 503_LIBCPP_BEGIN_NAMESPACE_STD 504 505template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 506template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 507 508template <bool> struct _MetaBase; 509template <> 510struct _MetaBase<true> { 511 template <class _Tp, class _Up> 512 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 513 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 514 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 515 template <class _First, class...> 516 using _FirstImpl _LIBCPP_NODEBUG = _First; 517 template <class, class _Second, class...> 518 using _SecondImpl _LIBCPP_NODEBUG = _Second; 519 template <class _Result, class _First, class ..._Rest> 520 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 521}; 522 523template <> 524struct _MetaBase<false> { 525 template <class _Tp, class _Up> 526 using _SelectImpl _LIBCPP_NODEBUG = _Up; 527 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 528 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 529 template <class _Result, class ...> 530 using _OrImpl _LIBCPP_NODEBUG = _Result; 531}; 532template <bool _Cond, class _IfRes, class _ElseRes> 533using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 534template <class ..._Rest> 535using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 536template <class _Pred> 537struct _Not : _BoolConstant<!_Pred::value> {}; 538template <class ..._Args> 539using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 540template <class ..._Args> 541using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 542 543template <class ...> using __expand_to_true = true_type; 544template <class ..._Pred> 545__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); 546template <class ...> 547false_type __and_helper(...); 548template <class ..._Pred> 549using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 550 551template <template <class...> class _Func, class ..._Args> 552struct _Lazy : _Func<_Args...> {}; 553 554// Member detector base 555 556template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 557true_type __sfinae_test_impl(int); 558template <template <class...> class, class ...> 559false_type __sfinae_test_impl(...); 560 561template <template <class ...> class _Templ, class ..._Args> 562using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 563 564template <class> 565struct __void_t { typedef void type; }; 566 567template <class _Tp, bool> 568struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 569 570// is_same 571 572template <class _Tp> 573using __test_for_primary_template = __enable_if_t< 574 _IsSame<_Tp, typename _Tp::__primary_template>::value 575 >; 576template <class _Tp> 577using __is_primary_template = _IsValidExpansion< 578 __test_for_primary_template, _Tp 579 >; 580 581// is_integral 582 583// [basic.fundamental] defines five standard signed integer types; 584// __int128_t is an extended signed integer type. 585// The signed and unsigned integer types, plus bool and the 586// five types with "char" in their name, compose the "integral" types. 587 588template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 589template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 590template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 591template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 592template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 593template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 594#ifndef _LIBCPP_HAS_NO_INT128 595template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 596#endif 597 598template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 599template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 600template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 601template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 602template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 603template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 604#ifndef _LIBCPP_HAS_NO_INT128 605template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 606#endif 607 608template <class _Tp> 609struct __unconstref { 610 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 611}; 612 613template <class _Tp> 614using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type; 615 616// __is_same_uncvref 617 618template <class _Tp, class _Up> 619struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {}; 620 621#if _LIBCPP_STD_VER > 17 622// remove_cvref - same as __uncvref 623template <class _Tp> 624struct remove_cvref { 625 using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>; 626}; 627 628template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 629#endif 630 631// is_nothrow_convertible 632 633#if _LIBCPP_STD_VER > 17 634 635template <typename _Tp> 636static void __test_noexcept(_Tp) noexcept; 637 638template<typename _Fm, typename _To> 639static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 640__is_nothrow_convertible_test(); 641 642template <typename _Fm, typename _To> 643struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 644{ }; 645 646template <typename _Fm, typename _To> 647struct is_nothrow_convertible : _Or< 648 _And<is_void<_To>, is_void<_Fm>>, 649 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 650>::type { }; 651 652template <typename _Fm, typename _To> 653inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 654 655#endif // _LIBCPP_STD_VER > 17 656 657// aligned_storage 658 659template <class _Hp, class _Tp> 660struct __type_list 661{ 662 typedef _Hp _Head; 663 typedef _Tp _Tail; 664}; 665 666template <class _Tp> 667struct __align_type 668{ 669 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 670 typedef _Tp type; 671}; 672 673struct __struct_double {long double __lx;}; 674struct __struct_double4 {double __lx[4];}; 675 676typedef 677 __type_list<__align_type<unsigned char>, 678 __type_list<__align_type<unsigned short>, 679 __type_list<__align_type<unsigned int>, 680 __type_list<__align_type<unsigned long>, 681 __type_list<__align_type<unsigned long long>, 682 __type_list<__align_type<double>, 683 __type_list<__align_type<long double>, 684 __type_list<__align_type<__struct_double>, 685 __type_list<__align_type<__struct_double4>, 686 __type_list<__align_type<int*>, 687 __nat 688 > > > > > > > > > > __all_types; 689 690template <size_t _Align> 691struct _ALIGNAS(_Align) __fallback_overaligned {}; 692 693template <class _TL, size_t _Align> struct __find_pod; 694 695template <class _Hp, size_t _Align> 696struct __find_pod<__type_list<_Hp, __nat>, _Align> 697{ 698 typedef typename conditional< 699 _Align == _Hp::value, 700 typename _Hp::type, 701 __fallback_overaligned<_Align> 702 >::type type; 703}; 704 705template <class _Hp, class _Tp, size_t _Align> 706struct __find_pod<__type_list<_Hp, _Tp>, _Align> 707{ 708 typedef typename conditional< 709 _Align == _Hp::value, 710 typename _Hp::type, 711 typename __find_pod<_Tp, _Align>::type 712 >::type type; 713}; 714 715template <class _TL, size_t _Len> struct __find_max_align; 716 717template <class _Hp, size_t _Len> 718struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 719 720template <size_t _Len, size_t _A1, size_t _A2> 721struct __select_align 722{ 723private: 724 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 725 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 726public: 727 static const size_t value = _Len < __max ? __min : __max; 728}; 729 730template <class _Hp, class _Tp, size_t _Len> 731struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 732 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 733 734template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 735struct _LIBCPP_TEMPLATE_VIS aligned_storage 736{ 737 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 738 union type 739 { 740 _Aligner __align; 741 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 742 }; 743}; 744 745#if _LIBCPP_STD_VER > 11 746template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 747 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 748#endif 749 750#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 751template <size_t _Len>\ 752struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 753{\ 754 struct _ALIGNAS(n) type\ 755 {\ 756 unsigned char __lx[(_Len + n - 1)/n * n];\ 757 };\ 758} 759 760_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 761_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 762_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 763_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 764_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 765_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 766_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 767_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 768_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 769_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 770_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 771_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 772_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 773_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 774// PE/COFF does not support alignment beyond 8192 (=0x2000) 775#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 776_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 777#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 778 779#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 780 781 782// aligned_union 783 784template <size_t _I0, size_t ..._In> 785struct __static_max; 786 787template <size_t _I0> 788struct __static_max<_I0> 789{ 790 static const size_t value = _I0; 791}; 792 793template <size_t _I0, size_t _I1, size_t ..._In> 794struct __static_max<_I0, _I1, _In...> 795{ 796 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 797 __static_max<_I1, _In...>::value; 798}; 799 800template <size_t _Len, class _Type0, class ..._Types> 801struct aligned_union 802{ 803 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 804 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 805 static const size_t __len = __static_max<_Len, sizeof(_Type0), 806 sizeof(_Types)...>::value; 807 typedef typename aligned_storage<__len, alignment_value>::type type; 808}; 809 810#if _LIBCPP_STD_VER > 11 811template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 812#endif 813 814template <class _Tp> 815struct __numeric_type 816{ 817 static void __test(...); 818 static float __test(float); 819 static double __test(char); 820 static double __test(int); 821 static double __test(unsigned); 822 static double __test(long); 823 static double __test(unsigned long); 824 static double __test(long long); 825 static double __test(unsigned long long); 826 static double __test(double); 827 static long double __test(long double); 828 829 typedef decltype(__test(declval<_Tp>())) type; 830 static const bool value = _IsNotSame<type, void>::value; 831}; 832 833template <> 834struct __numeric_type<void> 835{ 836 static const bool value = true; 837}; 838 839// __promote 840 841template <class _A1, class _A2 = void, class _A3 = void, 842 bool = __numeric_type<_A1>::value && 843 __numeric_type<_A2>::value && 844 __numeric_type<_A3>::value> 845class __promote_imp 846{ 847public: 848 static const bool value = false; 849}; 850 851template <class _A1, class _A2, class _A3> 852class __promote_imp<_A1, _A2, _A3, true> 853{ 854private: 855 typedef typename __promote_imp<_A1>::type __type1; 856 typedef typename __promote_imp<_A2>::type __type2; 857 typedef typename __promote_imp<_A3>::type __type3; 858public: 859 typedef decltype(__type1() + __type2() + __type3()) type; 860 static const bool value = true; 861}; 862 863template <class _A1, class _A2> 864class __promote_imp<_A1, _A2, void, true> 865{ 866private: 867 typedef typename __promote_imp<_A1>::type __type1; 868 typedef typename __promote_imp<_A2>::type __type2; 869public: 870 typedef decltype(__type1() + __type2()) type; 871 static const bool value = true; 872}; 873 874template <class _A1> 875class __promote_imp<_A1, void, void, true> 876{ 877public: 878 typedef typename __numeric_type<_A1>::type type; 879 static const bool value = true; 880}; 881 882template <class _A1, class _A2 = void, class _A3 = void> 883class __promote : public __promote_imp<_A1, _A2, _A3> {}; 884 885// make_signed / make_unsigned 886 887typedef 888 __type_list<signed char, 889 __type_list<signed short, 890 __type_list<signed int, 891 __type_list<signed long, 892 __type_list<signed long long, 893#ifndef _LIBCPP_HAS_NO_INT128 894 __type_list<__int128_t, 895#endif 896 __nat 897#ifndef _LIBCPP_HAS_NO_INT128 898 > 899#endif 900 > > > > > __signed_types; 901 902typedef 903 __type_list<unsigned char, 904 __type_list<unsigned short, 905 __type_list<unsigned int, 906 __type_list<unsigned long, 907 __type_list<unsigned long long, 908#ifndef _LIBCPP_HAS_NO_INT128 909 __type_list<__uint128_t, 910#endif 911 __nat 912#ifndef _LIBCPP_HAS_NO_INT128 913 > 914#endif 915 > > > > > __unsigned_types; 916 917template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 918 919template <class _Hp, class _Tp, size_t _Size> 920struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 921{ 922 typedef _LIBCPP_NODEBUG _Hp type; 923}; 924 925template <class _Hp, class _Tp, size_t _Size> 926struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 927{ 928 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 929}; 930 931template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 932struct __make_signed {}; 933 934template <class _Tp> 935struct __make_signed<_Tp, true> 936{ 937 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 938}; 939 940template <> struct __make_signed<bool, true> {}; 941template <> struct __make_signed< signed short, true> {typedef short type;}; 942template <> struct __make_signed<unsigned short, true> {typedef short type;}; 943template <> struct __make_signed< signed int, true> {typedef int type;}; 944template <> struct __make_signed<unsigned int, true> {typedef int type;}; 945template <> struct __make_signed< signed long, true> {typedef long type;}; 946template <> struct __make_signed<unsigned long, true> {typedef long type;}; 947template <> struct __make_signed< signed long long, true> {typedef long long type;}; 948template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 949#ifndef _LIBCPP_HAS_NO_INT128 950template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 951template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 952#endif 953 954template <class _Tp> 955struct _LIBCPP_TEMPLATE_VIS make_signed 956{ 957 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 958}; 959 960#if _LIBCPP_STD_VER > 11 961template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 962#endif 963 964template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 965struct __make_unsigned {}; 966 967template <class _Tp> 968struct __make_unsigned<_Tp, true> 969{ 970 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 971}; 972 973template <> struct __make_unsigned<bool, true> {}; 974template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 975template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 976template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 977template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 978template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 979template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 980template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 981template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 982#ifndef _LIBCPP_HAS_NO_INT128 983template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 984template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 985#endif 986 987template <class _Tp> 988struct _LIBCPP_TEMPLATE_VIS make_unsigned 989{ 990 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 991}; 992 993#if _LIBCPP_STD_VER > 11 994template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 995#endif 996 997#ifndef _LIBCPP_CXX03_LANG 998template <class _Tp> 999_LIBCPP_HIDE_FROM_ABI constexpr 1000typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 1001 return static_cast<typename make_unsigned<_Tp>::type>(__x); 1002} 1003#endif 1004 1005#if _LIBCPP_STD_VER > 14 1006template <class...> using void_t = void; 1007#endif 1008 1009#if _LIBCPP_STD_VER > 17 1010// Let COND_RES(X, Y) be: 1011template <class _Tp, class _Up> 1012using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 1013 1014template <class _Tp, class _Up, class = void> 1015struct __common_type3 {}; 1016 1017// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 1018template <class _Tp, class _Up> 1019struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 1020{ 1021 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 1022}; 1023 1024template <class _Tp, class _Up, class = void> 1025struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 1026#else 1027template <class _Tp, class _Up, class = void> 1028struct __common_type2_imp {}; 1029#endif 1030 1031// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 1032template <class _Tp, class _Up> 1033struct __common_type2_imp<_Tp, _Up, 1034 typename __void_t<decltype( 1035 true ? declval<_Tp>() : declval<_Up>() 1036 )>::type> 1037{ 1038 typedef _LIBCPP_NODEBUG typename decay<decltype( 1039 true ? declval<_Tp>() : declval<_Up>() 1040 )>::type type; 1041}; 1042 1043template <class, class = void> 1044struct __common_type_impl {}; 1045 1046// Clang provides variadic templates in C++03 as an extension. 1047#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 1048# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 1049template <class... _Tp> 1050struct __common_types; 1051template <class... _Tp> 1052struct _LIBCPP_TEMPLATE_VIS common_type; 1053#else 1054# define _LIBCPP_OPTIONAL_PACK(...) 1055struct __no_arg; 1056template <class _Tp, class _Up, class = __no_arg> 1057struct __common_types; 1058template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 1059 class _Unused = __no_arg> 1060struct common_type { 1061 static_assert(sizeof(_Unused) == 0, 1062 "common_type accepts at most 3 arguments in C++03"); 1063}; 1064#endif // _LIBCPP_CXX03_LANG 1065 1066template <class _Tp, class _Up> 1067struct __common_type_impl< 1068 __common_types<_Tp, _Up>, 1069 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1070{ 1071 typedef typename common_type<_Tp, _Up>::type type; 1072}; 1073 1074template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1075struct __common_type_impl< 1076 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 1077 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1078 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 1079 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 1080}; 1081 1082// bullet 1 - sizeof...(Tp) == 0 1083 1084template <> 1085struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 1086 1087// bullet 2 - sizeof...(Tp) == 1 1088 1089template <class _Tp> 1090struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 1091 : public common_type<_Tp, _Tp> {}; 1092 1093// bullet 3 - sizeof...(Tp) == 2 1094 1095// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 1096template <class _Tp, class _Up> 1097struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 1098 : conditional< 1099 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 1100 __common_type2_imp<_Tp, _Up>, 1101 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 1102 >::type 1103{}; 1104 1105// bullet 4 - sizeof...(Tp) > 2 1106 1107template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1108struct _LIBCPP_TEMPLATE_VIS 1109 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 1110 : __common_type_impl< 1111 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 1112 1113#undef _LIBCPP_OPTIONAL_PACK 1114 1115#if _LIBCPP_STD_VER > 11 1116template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 1117#endif 1118 1119#if _LIBCPP_STD_VER > 11 1120// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 1121// top-level cv-qualifiers. 1122template <class _From, class _To> 1123struct __copy_cv 1124{ 1125 using type = _To; 1126}; 1127 1128template <class _From, class _To> 1129struct __copy_cv<const _From, _To> 1130{ 1131 using type = add_const_t<_To>; 1132}; 1133 1134template <class _From, class _To> 1135struct __copy_cv<volatile _From, _To> 1136{ 1137 using type = add_volatile_t<_To>; 1138}; 1139 1140template <class _From, class _To> 1141struct __copy_cv<const volatile _From, _To> 1142{ 1143 using type = add_cv_t<_To>; 1144}; 1145 1146template <class _From, class _To> 1147using __copy_cv_t = typename __copy_cv<_From, _To>::type; 1148 1149template <class _From, class _To> 1150struct __copy_cvref 1151{ 1152 using type = __copy_cv_t<_From, _To>; 1153}; 1154 1155template <class _From, class _To> 1156struct __copy_cvref<_From&, _To> 1157{ 1158 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 1159}; 1160 1161template <class _From, class _To> 1162struct __copy_cvref<_From&&, _To> 1163{ 1164 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 1165}; 1166 1167template <class _From, class _To> 1168using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 1169 1170#endif // _LIBCPP_STD_VER > 11 1171 1172// common_reference 1173#if _LIBCPP_STD_VER > 17 1174// Let COND_RES(X, Y) be: 1175template <class _Xp, class _Yp> 1176using __cond_res = 1177 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 1178 1179// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 1180// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 1181// `U`. 1182// [Note: `XREF(A)` is `__xref<A>::template __apply`] 1183template <class _Tp> 1184struct __xref { 1185 template<class _Up> 1186 using __apply = __copy_cvref_t<_Tp, _Up>; 1187}; 1188 1189// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 1190// and let COMMON-REF(A, B) be: 1191template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 1192struct __common_ref; 1193 1194template<class _Xp, class _Yp> 1195using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 1196 1197template<class _Xp, class _Yp> 1198using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 1199 1200 1201// If A and B are both lvalue reference types, COMMON-REF(A, B) is 1202// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 1203template<class _Ap, class _Bp, class _Xp, class _Yp> 1204requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 1205struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 1206{ 1207 using __type = __cv_cond_res<_Xp, _Yp>; 1208}; 1209 1210// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 1211template <class _Xp, class _Yp> 1212using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 1213 1214 1215// .... If A and B are both rvalue reference types, C is well-formed, and 1216// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 1217template<class _Ap, class _Bp, class _Xp, class _Yp> 1218requires 1219 requires { typename __common_ref_C<_Xp, _Yp>; } && 1220 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 1221 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 1222struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 1223{ 1224 using __type = __common_ref_C<_Xp, _Yp>; 1225}; 1226 1227// Otherwise, let D be COMMON-REF(const X&, Y&). ... 1228template <class _Tp, class _Up> 1229using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 1230 1231// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 1232// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 1233template<class _Ap, class _Bp, class _Xp, class _Yp> 1234requires requires { typename __common_ref_D<_Xp, _Yp>; } && 1235 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 1236struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 1237{ 1238 using __type = __common_ref_D<_Xp, _Yp>; 1239}; 1240 1241// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 1242// COMMON-REF(A, B) is COMMON-REF(B, A). 1243template<class _Ap, class _Bp, class _Xp, class _Yp> 1244struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 1245 1246// Otherwise, COMMON-REF(A, B) is ill-formed. 1247template<class _Ap, class _Bp, class _Xp, class _Yp> 1248struct __common_ref {}; 1249 1250// Note C: For the common_reference trait applied to a parameter pack [...] 1251 1252template <class...> 1253struct common_reference; 1254 1255template <class... _Types> 1256using common_reference_t = typename common_reference<_Types...>::type; 1257 1258// bullet 1 - sizeof...(T) == 0 1259template<> 1260struct common_reference<> {}; 1261 1262// bullet 2 - sizeof...(T) == 1 1263template <class _Tp> 1264struct common_reference<_Tp> 1265{ 1266 using type = _Tp; 1267}; 1268 1269// bullet 3 - sizeof...(T) == 2 1270template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 1271template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 1272template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 1273 1274// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 1275// the member typedef `type` denotes that type. 1276template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 1277 1278template <class _Tp, class _Up> 1279requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 1280struct __common_reference_sub_bullet1<_Tp, _Up> 1281{ 1282 using type = __common_ref_t<_Tp, _Up>; 1283}; 1284 1285// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 1286// is well-formed, then the member typedef `type` denotes that type. 1287template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 1288 1289template <class _Tp, class _Up> 1290using __basic_common_reference_t = typename basic_common_reference< 1291 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 1292 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 1293 1294template <class _Tp, class _Up> 1295requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 1296struct __common_reference_sub_bullet2<_Tp, _Up> 1297{ 1298 using type = __basic_common_reference_t<_Tp, _Up>; 1299}; 1300 1301// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 1302// then the member typedef `type` denotes that type. 1303template <class _Tp, class _Up> 1304requires requires { typename __cond_res<_Tp, _Up>; } 1305struct __common_reference_sub_bullet3<_Tp, _Up> 1306{ 1307 using type = __cond_res<_Tp, _Up>; 1308}; 1309 1310 1311// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 1312// then the member typedef `type` denotes that type. 1313// - Otherwise, there shall be no member `type`. 1314template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 1315 1316// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 1317// any, as `common_reference_t<C, Rest...>`. 1318template <class _Tp, class _Up, class _Vp, class... _Rest> 1319requires requires { typename common_reference_t<_Tp, _Up>; } 1320struct common_reference<_Tp, _Up, _Vp, _Rest...> 1321 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 1322{}; 1323 1324// bullet 5 - Otherwise, there shall be no member `type`. 1325template <class...> struct common_reference {}; 1326 1327#endif // _LIBCPP_STD_VER > 17 1328 1329// is_destructible 1330 1331#if __has_keyword(__is_destructible) 1332 1333template<class _Tp> 1334struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 1335 1336#if _LIBCPP_STD_VER > 14 1337template <class _Tp> 1338inline constexpr bool is_destructible_v = __is_destructible(_Tp); 1339#endif 1340 1341#else // __has_keyword(__is_destructible) 1342 1343// if it's a reference, return true 1344// if it's a function, return false 1345// if it's void, return false 1346// if it's an array of unknown bound, return false 1347// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 1348// where _Up is remove_all_extents<_Tp>::type 1349 1350template <class> 1351struct __is_destructible_apply { typedef int type; }; 1352 1353template <typename _Tp> 1354struct __is_destructor_wellformed { 1355 template <typename _Tp1> 1356 static true_type __test ( 1357 typename __is_destructible_apply<decltype(declval<_Tp1&>().~_Tp1())>::type 1358 ); 1359 1360 template <typename _Tp1> 1361 static false_type __test (...); 1362 1363 static const bool value = decltype(__test<_Tp>(12))::value; 1364}; 1365 1366template <class _Tp, bool> 1367struct __destructible_imp; 1368 1369template <class _Tp> 1370struct __destructible_imp<_Tp, false> 1371 : public integral_constant<bool, 1372 __is_destructor_wellformed<typename remove_all_extents<_Tp>::type>::value> {}; 1373 1374template <class _Tp> 1375struct __destructible_imp<_Tp, true> 1376 : public true_type {}; 1377 1378template <class _Tp, bool> 1379struct __destructible_false; 1380 1381template <class _Tp> 1382struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, is_reference<_Tp>::value> {}; 1383 1384template <class _Tp> 1385struct __destructible_false<_Tp, true> : public false_type {}; 1386 1387template <class _Tp> 1388struct is_destructible 1389 : public __destructible_false<_Tp, is_function<_Tp>::value> {}; 1390 1391template <class _Tp> 1392struct is_destructible<_Tp[]> 1393 : public false_type {}; 1394 1395template <> 1396struct is_destructible<void> 1397 : public false_type {}; 1398 1399#if _LIBCPP_STD_VER > 14 1400template <class _Tp> 1401inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; 1402#endif 1403 1404#endif // __has_keyword(__is_destructible) 1405 1406// template <class T, class... Args> struct is_constructible; 1407 1408template <class _Tp, class ..._Args> 1409struct _LIBCPP_TEMPLATE_VIS is_constructible 1410 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 1411{ }; 1412 1413#if _LIBCPP_STD_VER > 14 1414template <class _Tp, class ..._Args> 1415inline constexpr bool is_constructible_v = is_constructible<_Tp, _Args...>::value; 1416#endif 1417 1418// is_default_constructible 1419 1420template <class _Tp> 1421struct _LIBCPP_TEMPLATE_VIS is_default_constructible 1422 : public is_constructible<_Tp> 1423 {}; 1424 1425#if _LIBCPP_STD_VER > 14 1426template <class _Tp> 1427inline constexpr bool is_default_constructible_v = is_default_constructible<_Tp>::value; 1428#endif 1429 1430#ifndef _LIBCPP_CXX03_LANG 1431// First of all, we can't implement this check in C++03 mode because the {} 1432// default initialization syntax isn't valid. 1433// Second, we implement the trait in a funny manner with two defaulted template 1434// arguments to workaround Clang's PR43454. 1435template <class _Tp> 1436void __test_implicit_default_constructible(_Tp); 1437 1438template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 1439struct __is_implicitly_default_constructible 1440 : false_type 1441{ }; 1442 1443template <class _Tp> 1444struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 1445 : true_type 1446{ }; 1447 1448template <class _Tp> 1449struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 1450 : false_type 1451{ }; 1452#endif // !C++03 1453 1454// is_copy_constructible 1455 1456template <class _Tp> 1457struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 1458 : public is_constructible<_Tp, 1459 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1460 1461#if _LIBCPP_STD_VER > 14 1462template <class _Tp> 1463inline constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value; 1464#endif 1465 1466// is_move_constructible 1467 1468template <class _Tp> 1469struct _LIBCPP_TEMPLATE_VIS is_move_constructible 1470 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 1471 {}; 1472 1473#if _LIBCPP_STD_VER > 14 1474template <class _Tp> 1475inline constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value; 1476#endif 1477 1478// is_trivially_constructible 1479 1480template <class _Tp, class... _Args> 1481struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 1482 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 1483{ 1484}; 1485 1486#if _LIBCPP_STD_VER > 14 1487template <class _Tp, class... _Args> 1488inline constexpr bool is_trivially_constructible_v = is_trivially_constructible<_Tp, _Args...>::value; 1489#endif 1490 1491// is_trivially_default_constructible 1492 1493template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 1494 : public is_trivially_constructible<_Tp> 1495 {}; 1496 1497#if _LIBCPP_STD_VER > 14 1498template <class _Tp> 1499inline constexpr bool is_trivially_default_constructible_v = is_trivially_default_constructible<_Tp>::value; 1500#endif 1501 1502// is_trivially_copy_constructible 1503 1504template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 1505 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 1506 {}; 1507 1508#if _LIBCPP_STD_VER > 14 1509template <class _Tp> 1510inline constexpr bool is_trivially_copy_constructible_v = is_trivially_copy_constructible<_Tp>::value; 1511#endif 1512 1513// is_trivially_move_constructible 1514 1515template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 1516 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 1517 {}; 1518 1519#if _LIBCPP_STD_VER > 14 1520template <class _Tp> 1521inline constexpr bool is_trivially_move_constructible_v = is_trivially_move_constructible<_Tp>::value; 1522#endif 1523 1524// is_trivially_assignable 1525 1526template <class _Tp, class _Arg> 1527struct is_trivially_assignable 1528 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 1529{ }; 1530 1531#if _LIBCPP_STD_VER > 14 1532template <class _Tp, class _Arg> 1533inline constexpr bool is_trivially_assignable_v = is_trivially_assignable<_Tp, _Arg>::value; 1534#endif 1535 1536// is_trivially_copy_assignable 1537 1538template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 1539 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 1540 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1541 1542#if _LIBCPP_STD_VER > 14 1543template <class _Tp> 1544inline constexpr bool is_trivially_copy_assignable_v = is_trivially_copy_assignable<_Tp>::value; 1545#endif 1546 1547// is_trivially_move_assignable 1548 1549template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 1550 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 1551 typename add_rvalue_reference<_Tp>::type> 1552 {}; 1553 1554#if _LIBCPP_STD_VER > 14 1555template <class _Tp> 1556inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<_Tp>::value; 1557#endif 1558 1559// is_trivially_destructible 1560 1561#if __has_keyword(__is_trivially_destructible) 1562 1563template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 1564 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 1565 1566#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 1567 1568template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 1569 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 1570 1571#else 1572 1573template <class _Tp> struct __libcpp_trivial_destructor 1574 : public integral_constant<bool, is_scalar<_Tp>::value || 1575 is_reference<_Tp>::value> {}; 1576 1577template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 1578 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 1579 1580template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 1581 : public false_type {}; 1582 1583#endif 1584 1585#if _LIBCPP_STD_VER > 14 1586template <class _Tp> 1587inline constexpr bool is_trivially_destructible_v = is_trivially_destructible<_Tp>::value; 1588#endif 1589 1590// is_nothrow_constructible 1591 1592#if __has_keyword(__is_nothrow_constructible) 1593 1594template <class _Tp, class... _Args> 1595struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 1596 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 1597 1598#else 1599 1600template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 1601 1602template <class _Tp, class... _Args> 1603struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 1604 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 1605{ 1606}; 1607 1608template <class _Tp> 1609void __implicit_conversion_to(_Tp) noexcept { } 1610 1611template <class _Tp, class _Arg> 1612struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 1613 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 1614{ 1615}; 1616 1617template <class _Tp, bool _IsReference, class... _Args> 1618struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 1619 : public false_type 1620{ 1621}; 1622 1623template <class _Tp, class... _Args> 1624struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 1625 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 1626{ 1627}; 1628 1629template <class _Tp, size_t _Ns> 1630struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 1631 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 1632{ 1633}; 1634 1635#endif // _LIBCPP_HAS_NO_NOEXCEPT 1636 1637 1638#if _LIBCPP_STD_VER > 14 1639template <class _Tp, class ..._Args> 1640inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; 1641#endif 1642 1643// is_nothrow_default_constructible 1644 1645template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 1646 : public is_nothrow_constructible<_Tp> 1647 {}; 1648 1649#if _LIBCPP_STD_VER > 14 1650template <class _Tp> 1651inline constexpr bool is_nothrow_default_constructible_v = is_nothrow_default_constructible<_Tp>::value; 1652#endif 1653 1654// is_nothrow_copy_constructible 1655 1656template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 1657 : public is_nothrow_constructible<_Tp, 1658 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1659 1660#if _LIBCPP_STD_VER > 14 1661template <class _Tp> 1662inline constexpr bool is_nothrow_copy_constructible_v = is_nothrow_copy_constructible<_Tp>::value; 1663#endif 1664 1665// is_nothrow_move_constructible 1666 1667template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 1668 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 1669 {}; 1670 1671#if _LIBCPP_STD_VER > 14 1672template <class _Tp> 1673inline constexpr bool is_nothrow_move_constructible_v = is_nothrow_move_constructible<_Tp>::value; 1674#endif 1675 1676// is_nothrow_assignable 1677 1678#if __has_keyword(__is_nothrow_assignable) 1679 1680template <class _Tp, class _Arg> 1681struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 1682 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 1683 1684#else 1685 1686template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 1687 1688template <class _Tp, class _Arg> 1689struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 1690 : public false_type 1691{ 1692}; 1693 1694template <class _Tp, class _Arg> 1695struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 1696 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Arg>()) > 1697{ 1698}; 1699 1700template <class _Tp, class _Arg> 1701struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 1702 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 1703{ 1704}; 1705 1706#endif // _LIBCPP_HAS_NO_NOEXCEPT 1707 1708#if _LIBCPP_STD_VER > 14 1709template <class _Tp, class _Arg> 1710inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<_Tp, _Arg>::value; 1711#endif 1712 1713// is_nothrow_copy_assignable 1714 1715template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 1716 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 1717 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 1718 1719#if _LIBCPP_STD_VER > 14 1720template <class _Tp> 1721inline constexpr bool is_nothrow_copy_assignable_v = is_nothrow_copy_assignable<_Tp>::value; 1722#endif 1723 1724// is_nothrow_move_assignable 1725 1726template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 1727 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 1728 typename add_rvalue_reference<_Tp>::type> 1729 {}; 1730 1731#if _LIBCPP_STD_VER > 14 1732template <class _Tp> 1733inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<_Tp>::value; 1734#endif 1735 1736// is_nothrow_destructible 1737 1738#if !defined(_LIBCPP_CXX03_LANG) 1739 1740template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 1741 1742template <class _Tp> 1743struct __libcpp_is_nothrow_destructible<false, _Tp> 1744 : public false_type 1745{ 1746}; 1747 1748template <class _Tp> 1749struct __libcpp_is_nothrow_destructible<true, _Tp> 1750 : public integral_constant<bool, noexcept(declval<_Tp>().~_Tp()) > 1751{ 1752}; 1753 1754template <class _Tp> 1755struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 1756 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 1757{ 1758}; 1759 1760template <class _Tp, size_t _Ns> 1761struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 1762 : public is_nothrow_destructible<_Tp> 1763{ 1764}; 1765 1766template <class _Tp> 1767struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 1768 : public true_type 1769{ 1770}; 1771 1772template <class _Tp> 1773struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 1774 : public true_type 1775{ 1776}; 1777 1778#else 1779 1780template <class _Tp> struct __libcpp_nothrow_destructor 1781 : public integral_constant<bool, is_scalar<_Tp>::value || 1782 is_reference<_Tp>::value> {}; 1783 1784template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 1785 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 1786 1787template <class _Tp> 1788struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 1789 : public false_type {}; 1790 1791#endif 1792 1793#if _LIBCPP_STD_VER > 14 1794template <class _Tp> 1795inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value; 1796#endif 1797 1798// result_of 1799 1800#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1801template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 1802 1803#ifndef _LIBCPP_CXX03_LANG 1804 1805template <class _Fp, class ..._Args> 1806class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 1807 : public __invoke_of<_Fp, _Args...> 1808{ 1809}; 1810 1811#else // C++03 1812 1813template <class _Fn, bool, bool> 1814class __result_of 1815{ 1816}; 1817 1818template <class _Fn, class ..._Args> 1819class __result_of<_Fn(_Args...), true, false> 1820{ 1821public: 1822 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 1823}; 1824 1825template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 1826struct __result_of_mp; 1827 1828// member function pointer 1829 1830template <class _MP, class _Tp> 1831struct __result_of_mp<_MP, _Tp, true> 1832{ 1833 using type = typename __member_pointer_traits<_MP>::_ReturnType; 1834}; 1835 1836// member data pointer 1837 1838template <class _MP, class _Tp, bool> 1839struct __result_of_mdp; 1840 1841template <class _Rp, class _Class, class _Tp> 1842struct __result_of_mdp<_Rp _Class::*, _Tp, false> 1843{ 1844 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 1845}; 1846 1847template <class _Rp, class _Class, class _Tp> 1848struct __result_of_mdp<_Rp _Class::*, _Tp, true> 1849{ 1850 using type = typename __apply_cv<_Tp, _Rp>::type&; 1851}; 1852 1853template <class _Rp, class _Class, class _Tp> 1854struct __result_of_mp<_Rp _Class::*, _Tp, false> 1855 : public __result_of_mdp<_Rp _Class::*, _Tp, 1856 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 1857{ 1858}; 1859 1860template <class _Fn, class _Tp> 1861class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 1862 : public __result_of_mp<typename remove_reference<_Fn>::type, 1863 _Tp, 1864 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1865{ 1866}; 1867 1868template <class _Fn, class _Tp, class ..._Args> 1869class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 1870 : public __result_of_mp<typename remove_reference<_Fn>::type, 1871 _Tp, 1872 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1873{ 1874}; 1875 1876template <class _Fn, class ..._Args> 1877class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 1878 : public __result_of<_Fn(_Args...), 1879 is_class<typename remove_reference<_Fn>::type>::value || 1880 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 1881 is_member_pointer<typename remove_reference<_Fn>::type>::value 1882 > 1883{ 1884}; 1885 1886#endif // C++03 1887 1888#if _LIBCPP_STD_VER > 11 1889template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 1890#endif // _LIBCPP_STD_VER > 11 1891#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1892 1893// __swappable 1894 1895template <class _Tp> struct __is_swappable; 1896template <class _Tp> struct __is_nothrow_swappable; 1897 1898 1899#ifndef _LIBCPP_CXX03_LANG 1900template <class _Tp> 1901using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 1902#else 1903template <class> 1904using __swap_result_t = void; 1905#endif 1906 1907template <class _Tp> 1908inline _LIBCPP_INLINE_VISIBILITY 1909_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 1910swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 1911 is_nothrow_move_assignable<_Tp>::value); 1912 1913template<class _Tp, size_t _Np> 1914inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1915typename enable_if< 1916 __is_swappable<_Tp>::value 1917>::type 1918swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 1919 1920namespace __detail 1921{ 1922// ALL generic swap overloads MUST already have a declaration available at this point. 1923 1924template <class _Tp, class _Up = _Tp, 1925 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 1926struct __swappable_with 1927{ 1928 template <class _LHS, class _RHS> 1929 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 1930 __test_swap(int); 1931 template <class, class> 1932 static __nat __test_swap(long); 1933 1934 // Extra parens are needed for the C++03 definition of decltype. 1935 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 1936 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 1937 1938 static const bool value = _IsNotSame<__swap1, __nat>::value 1939 && _IsNotSame<__swap2, __nat>::value; 1940}; 1941 1942template <class _Tp, class _Up> 1943struct __swappable_with<_Tp, _Up, false> : false_type {}; 1944 1945template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 1946struct __nothrow_swappable_with { 1947 static const bool value = 1948#ifndef _LIBCPP_HAS_NO_NOEXCEPT 1949 noexcept(swap(declval<_Tp>(), declval<_Up>())) 1950 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 1951#else 1952 false; 1953#endif 1954}; 1955 1956template <class _Tp, class _Up> 1957struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 1958 1959} // namespace __detail 1960 1961template <class _Tp> 1962struct __is_swappable 1963 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 1964{ 1965}; 1966 1967template <class _Tp> 1968struct __is_nothrow_swappable 1969 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 1970{ 1971}; 1972 1973#if _LIBCPP_STD_VER > 14 1974 1975template <class _Tp, class _Up> 1976struct _LIBCPP_TEMPLATE_VIS is_swappable_with 1977 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 1978{ 1979}; 1980 1981template <class _Tp> 1982struct _LIBCPP_TEMPLATE_VIS is_swappable 1983 : public conditional< 1984 __is_referenceable<_Tp>::value, 1985 is_swappable_with< 1986 typename add_lvalue_reference<_Tp>::type, 1987 typename add_lvalue_reference<_Tp>::type>, 1988 false_type 1989 >::type 1990{ 1991}; 1992 1993template <class _Tp, class _Up> 1994struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 1995 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 1996{ 1997}; 1998 1999template <class _Tp> 2000struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 2001 : public conditional< 2002 __is_referenceable<_Tp>::value, 2003 is_nothrow_swappable_with< 2004 typename add_lvalue_reference<_Tp>::type, 2005 typename add_lvalue_reference<_Tp>::type>, 2006 false_type 2007 >::type 2008{ 2009}; 2010 2011template <class _Tp, class _Up> 2012inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 2013 2014template <class _Tp> 2015inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 2016 2017template <class _Tp, class _Up> 2018inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 2019 2020template <class _Tp> 2021inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 2022 2023#endif // _LIBCPP_STD_VER > 14 2024 2025template <class _Tp, bool = is_enum<_Tp>::value> 2026struct __sfinae_underlying_type 2027{ 2028 typedef typename underlying_type<_Tp>::type type; 2029 typedef decltype(((type)1) + 0) __promoted_type; 2030}; 2031 2032template <class _Tp> 2033struct __sfinae_underlying_type<_Tp, false> {}; 2034 2035inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2036int __convert_to_integral(int __val) { return __val; } 2037 2038inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2039unsigned __convert_to_integral(unsigned __val) { return __val; } 2040 2041inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2042long __convert_to_integral(long __val) { return __val; } 2043 2044inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2045unsigned long __convert_to_integral(unsigned long __val) { return __val; } 2046 2047inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2048long long __convert_to_integral(long long __val) { return __val; } 2049 2050inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2051unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 2052 2053template<typename _Fp> 2054inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2055typename enable_if<is_floating_point<_Fp>::value, long long>::type 2056 __convert_to_integral(_Fp __val) { return __val; } 2057 2058#ifndef _LIBCPP_HAS_NO_INT128 2059inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2060__int128_t __convert_to_integral(__int128_t __val) { return __val; } 2061 2062inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2063__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 2064#endif 2065 2066template <class _Tp> 2067inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2068typename __sfinae_underlying_type<_Tp>::__promoted_type 2069__convert_to_integral(_Tp __val) { return __val; } 2070 2071#if _LIBCPP_STD_VER > 14 2072template <class _Tp> 2073struct negation : _Not<_Tp> {}; 2074template<class _Tp> 2075inline constexpr bool negation_v = negation<_Tp>::value; 2076#endif // _LIBCPP_STD_VER > 14 2077 2078// These traits are used in __tree and __hash_table 2079struct __extract_key_fail_tag {}; 2080struct __extract_key_self_tag {}; 2081struct __extract_key_first_tag {}; 2082 2083template <class _ValTy, class _Key, 2084 class _RawValTy = typename __unconstref<_ValTy>::type> 2085struct __can_extract_key 2086 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 2087 __extract_key_fail_tag>::type {}; 2088 2089template <class _Pair, class _Key, class _First, class _Second> 2090struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 2091 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 2092 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 2093 2094// __can_extract_map_key uses true_type/false_type instead of the tags. 2095// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 2096// and _ValTy == _Key. 2097template <class _ValTy, class _Key, class _ContainerValueTy, 2098 class _RawValTy = typename __unconstref<_ValTy>::type> 2099struct __can_extract_map_key 2100 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 2101 2102// This specialization returns __extract_key_fail_tag for non-map containers 2103// because _Key == _ContainerValueTy 2104template <class _ValTy, class _Key, class _RawValTy> 2105struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 2106 : false_type {}; 2107 2108template <class _CharT> 2109using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 2110 2111template<class _Tp> 2112using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 2113 2114#if _LIBCPP_STD_VER > 17 2115template<bool _Const, class _Tp> 2116using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 2117#endif // _LIBCPP_STD_VER > 17 2118 2119_LIBCPP_END_NAMESPACE_STD 2120 2121#endif // _LIBCPP_TYPE_TRAITS 2122