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 <__config> 420#include <cstddef> 421#include <version> 422 423#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 424# pragma GCC system_header 425#endif 426 427_LIBCPP_BEGIN_NAMESPACE_STD 428 429template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 430template <class _Tp> class _LIBCPP_TEMPLATE_VIS reference_wrapper; 431template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 432 433template <class _Tp, _Tp __v> 434struct _LIBCPP_TEMPLATE_VIS integral_constant 435{ 436 static _LIBCPP_CONSTEXPR const _Tp value = __v; 437 typedef _Tp value_type; 438 typedef integral_constant type; 439 _LIBCPP_INLINE_VISIBILITY 440 _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;} 441#if _LIBCPP_STD_VER > 11 442 _LIBCPP_INLINE_VISIBILITY 443 constexpr value_type operator ()() const _NOEXCEPT {return value;} 444#endif 445}; 446 447template <class _Tp, _Tp __v> 448_LIBCPP_CONSTEXPR const _Tp integral_constant<_Tp, __v>::value; 449 450#if _LIBCPP_STD_VER > 14 451template <bool __b> 452using bool_constant = integral_constant<bool, __b>; 453#define _LIBCPP_BOOL_CONSTANT(__b) bool_constant<(__b)> 454#else 455#define _LIBCPP_BOOL_CONSTANT(__b) integral_constant<bool,(__b)> 456#endif 457 458template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {}; 459template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;}; 460 461template <bool _Bp, class _Tp = void> using __enable_if_t _LIBCPP_NODEBUG = typename enable_if<_Bp, _Tp>::type; 462 463#if _LIBCPP_STD_VER > 11 464template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; 465#endif 466 467typedef _LIBCPP_BOOL_CONSTANT(true) true_type; 468typedef _LIBCPP_BOOL_CONSTANT(false) false_type; 469 470template <bool _Val> 471using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>; 472 473template <bool> struct _MetaBase; 474template <> 475struct _MetaBase<true> { 476 template <class _Tp, class _Up> 477 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 478 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 479 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 480 template <class _First, class...> 481 using _FirstImpl _LIBCPP_NODEBUG = _First; 482 template <class, class _Second, class...> 483 using _SecondImpl _LIBCPP_NODEBUG = _Second; 484 template <class _Result, class _First, class ..._Rest> 485 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 486}; 487 488template <> 489struct _MetaBase<false> { 490 template <class _Tp, class _Up> 491 using _SelectImpl _LIBCPP_NODEBUG = _Up; 492 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 493 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 494 template <class _Result, class ...> 495 using _OrImpl _LIBCPP_NODEBUG = _Result; 496}; 497template <bool _Cond, class _IfRes, class _ElseRes> 498using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 499template <class ..._Rest> 500using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 501template <class _Pred> 502struct _Not : _BoolConstant<!_Pred::value> {}; 503template <class ..._Args> 504using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 505template <class ..._Args> 506using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 507 508template <class ...> using __expand_to_true = true_type; 509template <class ..._Pred> 510__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); 511template <class ...> 512false_type __and_helper(...); 513template <class ..._Pred> 514using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 515 516template <template <class...> class _Func, class ..._Args> 517struct _Lazy : _Func<_Args...> {}; 518 519// Member detector base 520 521template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 522true_type __sfinae_test_impl(int); 523template <template <class...> class, class ...> 524false_type __sfinae_test_impl(...); 525 526template <template <class ...> class _Templ, class ..._Args> 527using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 528 529template <class> 530struct __void_t { typedef void type; }; 531 532template <class _Tp> 533struct __identity { typedef _Tp type; }; 534 535template <class _Tp> 536using __identity_t _LIBCPP_NODEBUG = typename __identity<_Tp>::type; 537 538template <class _Tp, bool> 539struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 540 541 542template <bool _Bp, class _If, class _Then> 543 struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;}; 544template <class _If, class _Then> 545 struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;}; 546 547#if _LIBCPP_STD_VER > 11 548template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type; 549#endif 550 551// is_same 552 553template <class _Tp, class _Up> 554struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { }; 555 556#if _LIBCPP_STD_VER > 14 557template <class _Tp, class _Up> 558inline constexpr bool is_same_v = __is_same(_Tp, _Up); 559#endif 560 561// _IsSame<T,U> has the same effect as is_same<T,U> but instantiates fewer types: 562// is_same<A,B> and is_same<C,D> are guaranteed to be different types, but 563// _IsSame<A,B> and _IsSame<C,D> are the same type (namely, false_type). 564// Neither GCC nor Clang can mangle the __is_same builtin, so _IsSame 565// mustn't be directly used anywhere that contributes to name-mangling 566// (such as in a dependent return type). 567 568template <class _Tp, class _Up> 569using _IsSame = _BoolConstant<__is_same(_Tp, _Up)>; 570 571template <class _Tp, class _Up> 572using _IsNotSame = _BoolConstant<!__is_same(_Tp, _Up)>; 573 574template <class _Tp> 575using __test_for_primary_template = __enable_if_t< 576 _IsSame<_Tp, typename _Tp::__primary_template>::value 577 >; 578template <class _Tp> 579using __is_primary_template = _IsValidExpansion< 580 __test_for_primary_template, _Tp 581 >; 582 583// helper class 584 585struct __two {char __lx[2];}; 586 587// is_const 588 589#if __has_keyword(__is_const) 590 591template <class _Tp> 592struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { }; 593 594#if _LIBCPP_STD_VER > 14 595template <class _Tp> 596inline constexpr bool is_const_v = __is_const(_Tp); 597#endif 598 599#else 600 601template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 602template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 603 604#if _LIBCPP_STD_VER > 14 605template <class _Tp> 606inline constexpr bool is_const_v = is_const<_Tp>::value; 607#endif 608 609#endif // __has_keyword(__is_const) 610 611// is_volatile 612 613#if __has_keyword(__is_volatile) 614 615template <class _Tp> 616struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { }; 617 618#if _LIBCPP_STD_VER > 14 619template <class _Tp> 620inline constexpr bool is_volatile_v = __is_volatile(_Tp); 621#endif 622 623#else 624 625template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {}; 626template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {}; 627 628#if _LIBCPP_STD_VER > 14 629template <class _Tp> 630inline constexpr bool is_volatile_v = is_volatile<_Tp>::value; 631#endif 632 633#endif // __has_keyword(__is_volatile) 634 635// remove_const 636 637template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const {typedef _Tp type;}; 638template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;}; 639#if _LIBCPP_STD_VER > 11 640template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type; 641#endif 642 643// remove_volatile 644 645template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef _Tp type;}; 646template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;}; 647#if _LIBCPP_STD_VER > 11 648template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type; 649#endif 650 651// remove_cv 652 653template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv 654{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 655#if _LIBCPP_STD_VER > 11 656template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type; 657#endif 658 659// is_void 660 661#if __has_keyword(__is_void) 662 663template <class _Tp> 664struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { }; 665 666#if _LIBCPP_STD_VER > 14 667template <class _Tp> 668inline constexpr bool is_void_v = __is_void(_Tp); 669#endif 670 671#else 672 673template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void 674 : public is_same<typename remove_cv<_Tp>::type, void> {}; 675 676#if _LIBCPP_STD_VER > 14 677template <class _Tp> 678inline constexpr bool is_void_v = is_void<_Tp>::value; 679#endif 680 681#endif // __has_keyword(__is_void) 682 683// __is_nullptr_t 684 685template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 686template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 687 688template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 689 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 690 691#if _LIBCPP_STD_VER > 11 692template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 693 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 694 695#if _LIBCPP_STD_VER > 14 696template <class _Tp> 697inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; 698#endif 699#endif // _LIBCPP_STD_VER > 11 700 701// is_integral 702 703#if __has_keyword(__is_integral) 704 705template <class _Tp> 706struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { }; 707 708#if _LIBCPP_STD_VER > 14 709template <class _Tp> 710inline constexpr bool is_integral_v = __is_integral(_Tp); 711#endif 712 713#else 714 715template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral 716 : public _BoolConstant<__libcpp_is_integral<typename remove_cv<_Tp>::type>::value> {}; 717 718#if _LIBCPP_STD_VER > 14 719template <class _Tp> 720inline constexpr bool is_integral_v = is_integral<_Tp>::value; 721#endif 722 723#endif // __has_keyword(__is_integral) 724 725// [basic.fundamental] defines five standard signed integer types; 726// __int128_t is an extended signed integer type. 727// The signed and unsigned integer types, plus bool and the 728// five types with "char" in their name, compose the "integral" types. 729 730template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 731template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 732template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 733template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 734template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 735template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 736#ifndef _LIBCPP_HAS_NO_INT128 737template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 738#endif 739 740template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 741template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 742template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 743template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 744template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 745template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 746#ifndef _LIBCPP_HAS_NO_INT128 747template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 748#endif 749 750// is_floating_point 751// <concepts> implements __libcpp_floating_point 752 753template <class _Tp> struct __libcpp_is_floating_point : public false_type {}; 754template <> struct __libcpp_is_floating_point<float> : public true_type {}; 755template <> struct __libcpp_is_floating_point<double> : public true_type {}; 756template <> struct __libcpp_is_floating_point<long double> : public true_type {}; 757 758template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point 759 : public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {}; 760 761#if _LIBCPP_STD_VER > 14 762template <class _Tp> 763inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; 764#endif 765 766// is_array 767 768#if __has_keyword(__is_array) 769 770template <class _Tp> 771struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { }; 772 773#if _LIBCPP_STD_VER > 14 774template <class _Tp> 775inline constexpr bool is_array_v = __is_array(_Tp); 776#endif 777 778#else 779 780template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array 781 : public false_type {}; 782template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]> 783 : public true_type {}; 784template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]> 785 : public true_type {}; 786 787#if _LIBCPP_STD_VER > 14 788template <class _Tp> 789inline constexpr bool is_array_v = is_array<_Tp>::value; 790#endif 791 792#endif // __has_keyword(__is_array) 793 794// is_pointer 795 796// Before AppleClang 12.0.5, __is_pointer didn't work for Objective-C types. 797#if __has_keyword(__is_pointer) && \ 798 !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER < 1205) 799 800template<class _Tp> 801struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { }; 802 803#if _LIBCPP_STD_VER > 14 804template <class _Tp> 805inline constexpr bool is_pointer_v = __is_pointer(_Tp); 806#endif 807 808#else // __has_keyword(__is_pointer) 809 810template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 811template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 812 813template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 814#if defined(_LIBCPP_HAS_OBJC_ARC) 815template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 816template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 817template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 818template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 819#endif 820 821template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 822 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 823 824#if _LIBCPP_STD_VER > 14 825template <class _Tp> 826inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; 827#endif 828 829#endif // __has_keyword(__is_pointer) 830 831// is_reference 832 833#if __has_keyword(__is_lvalue_reference) && \ 834 __has_keyword(__is_rvalue_reference) && \ 835 __has_keyword(__is_reference) 836 837template<class _Tp> 838struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { }; 839 840template<class _Tp> 841struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { }; 842 843template<class _Tp> 844struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { }; 845 846#if _LIBCPP_STD_VER > 14 847template <class _Tp> 848inline constexpr bool is_reference_v = __is_reference(_Tp); 849template <class _Tp> 850inline constexpr bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); 851template <class _Tp> 852inline constexpr bool is_rvalue_reference_v = __is_rvalue_reference(_Tp); 853#endif 854 855#else // __has_keyword(__is_lvalue_reference) && etc... 856 857template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 858template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 859 860template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 861template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 862 863template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 864template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 865template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {}; 866 867#if _LIBCPP_STD_VER > 14 868template <class _Tp> 869inline constexpr bool is_reference_v = is_reference<_Tp>::value; 870 871template <class _Tp> 872inline constexpr bool is_lvalue_reference_v = is_lvalue_reference<_Tp>::value; 873 874template <class _Tp> 875inline constexpr bool is_rvalue_reference_v = is_rvalue_reference<_Tp>::value; 876#endif 877 878#endif // __has_keyword(__is_lvalue_reference) && etc... 879 880// is_union 881 882#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 883 884template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 885 : public integral_constant<bool, __is_union(_Tp)> {}; 886 887#else 888 889template <class _Tp> struct __libcpp_union : public false_type {}; 890template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 891 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 892 893#endif 894 895#if _LIBCPP_STD_VER > 14 896template <class _Tp> 897inline constexpr bool is_union_v = is_union<_Tp>::value; 898#endif 899 900// is_class 901 902#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 903 904template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 905 : public integral_constant<bool, __is_class(_Tp)> {}; 906 907#else 908 909namespace __is_class_imp 910{ 911template <class _Tp> char __test(int _Tp::*); 912template <class _Tp> __two __test(...); 913} 914 915template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 916 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 917 918#endif 919 920#if _LIBCPP_STD_VER > 14 921template <class _Tp> 922inline constexpr bool is_class_v = is_class<_Tp>::value; 923#endif 924 925// is_function 926 927template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 928 : public _BoolConstant< 929#ifdef __clang__ 930 __is_function(_Tp) 931#else 932 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 933#endif 934 > {}; 935 936 937#if _LIBCPP_STD_VER > 14 938template <class _Tp> 939inline constexpr bool is_function_v = is_function<_Tp>::value; 940#endif 941 942template <class _Tp> struct __libcpp_is_member_pointer { 943 enum { 944 __is_member = false, 945 __is_func = false, 946 __is_obj = false 947 }; 948}; 949template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 950 enum { 951 __is_member = true, 952 __is_func = is_function<_Tp>::value, 953 __is_obj = !__is_func, 954 }; 955}; 956 957#if __has_keyword(__is_member_function_pointer) 958 959template<class _Tp> 960struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 961 : _BoolConstant<__is_member_function_pointer(_Tp)> { }; 962 963#if _LIBCPP_STD_VER > 14 964template <class _Tp> 965inline constexpr bool is_member_function_pointer_v = __is_member_function_pointer(_Tp); 966#endif 967 968#else // __has_keyword(__is_member_function_pointer) 969 970template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 971 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 972 973#if _LIBCPP_STD_VER > 14 974template <class _Tp> 975inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value; 976#endif 977 978#endif // __has_keyword(__is_member_function_pointer) 979 980// is_member_pointer 981 982#if __has_keyword(__is_member_pointer) 983 984template<class _Tp> 985struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { }; 986 987#if _LIBCPP_STD_VER > 14 988template <class _Tp> 989inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp); 990#endif 991 992#else // __has_keyword(__is_member_pointer) 993 994template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 995 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 996 997#if _LIBCPP_STD_VER > 14 998template <class _Tp> 999inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; 1000#endif 1001 1002#endif // __has_keyword(__is_member_pointer) 1003 1004// is_member_object_pointer 1005 1006#if __has_keyword(__is_member_object_pointer) 1007 1008template<class _Tp> 1009struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1010 : _BoolConstant<__is_member_object_pointer(_Tp)> { }; 1011 1012#if _LIBCPP_STD_VER > 14 1013template <class _Tp> 1014inline constexpr bool is_member_object_pointer_v = __is_member_object_pointer(_Tp); 1015#endif 1016 1017#else // __has_keyword(__is_member_object_pointer) 1018 1019template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1020 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 1021 1022#if _LIBCPP_STD_VER > 14 1023template <class _Tp> 1024inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<_Tp>::value; 1025#endif 1026 1027#endif // __has_keyword(__is_member_object_pointer) 1028 1029// is_enum 1030 1031#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1032 1033template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1034 : public integral_constant<bool, __is_enum(_Tp)> {}; 1035 1036#if _LIBCPP_STD_VER > 14 1037template <class _Tp> 1038inline constexpr bool is_enum_v = __is_enum(_Tp); 1039#endif 1040 1041#else 1042 1043template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1044 : public integral_constant<bool, !is_void<_Tp>::value && 1045 !is_integral<_Tp>::value && 1046 !is_floating_point<_Tp>::value && 1047 !is_array<_Tp>::value && 1048 !is_pointer<_Tp>::value && 1049 !is_reference<_Tp>::value && 1050 !is_member_pointer<_Tp>::value && 1051 !is_union<_Tp>::value && 1052 !is_class<_Tp>::value && 1053 !is_function<_Tp>::value > {}; 1054 1055#if _LIBCPP_STD_VER > 14 1056template <class _Tp> 1057inline constexpr bool is_enum_v = is_enum<_Tp>::value; 1058#endif 1059 1060#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1061 1062// is_arithmetic 1063 1064 1065template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 1066 : public integral_constant<bool, is_integral<_Tp>::value || 1067 is_floating_point<_Tp>::value> {}; 1068 1069#if _LIBCPP_STD_VER > 14 1070template <class _Tp> 1071inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; 1072#endif 1073 1074// is_fundamental 1075 1076// Before Clang 10, __is_fundamental didn't work for nullptr_t. 1077// In C++03 nullptr_t is library-provided but must still count as "fundamental." 1078#if __has_keyword(__is_fundamental) && \ 1079 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) && \ 1080 !defined(_LIBCPP_CXX03_LANG) 1081 1082template<class _Tp> 1083struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { }; 1084 1085#if _LIBCPP_STD_VER > 14 1086template <class _Tp> 1087inline constexpr bool is_fundamental_v = __is_fundamental(_Tp); 1088#endif 1089 1090#else // __has_keyword(__is_fundamental) 1091 1092template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 1093 : public integral_constant<bool, is_void<_Tp>::value || 1094 __is_nullptr_t<_Tp>::value || 1095 is_arithmetic<_Tp>::value> {}; 1096 1097#if _LIBCPP_STD_VER > 14 1098template <class _Tp> 1099inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; 1100#endif 1101 1102#endif // __has_keyword(__is_fundamental) 1103 1104// is_scalar 1105 1106// In C++03 nullptr_t is library-provided but must still count as "scalar." 1107#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG) 1108 1109template<class _Tp> 1110struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { }; 1111 1112#if _LIBCPP_STD_VER > 14 1113template <class _Tp> 1114inline constexpr bool is_scalar_v = __is_scalar(_Tp); 1115#endif 1116 1117#else // __has_keyword(__is_scalar) 1118 1119template <class _Tp> struct __is_block : false_type {}; 1120#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) 1121template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {}; 1122#endif 1123 1124template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1125 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1126 is_member_pointer<_Tp>::value || 1127 is_pointer<_Tp>::value || 1128 __is_nullptr_t<_Tp>::value || 1129 __is_block<_Tp>::value || 1130 is_enum<_Tp>::value > {}; 1131 1132template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1133 1134#if _LIBCPP_STD_VER > 14 1135template <class _Tp> 1136inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; 1137#endif 1138 1139#endif // __has_keyword(__is_scalar) 1140 1141// is_object 1142 1143#if __has_keyword(__is_object) 1144 1145template<class _Tp> 1146struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { }; 1147 1148#if _LIBCPP_STD_VER > 14 1149template <class _Tp> 1150inline constexpr bool is_object_v = __is_object(_Tp); 1151#endif 1152 1153#else // __has_keyword(__is_object) 1154 1155template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1156 : public integral_constant<bool, is_scalar<_Tp>::value || 1157 is_array<_Tp>::value || 1158 is_union<_Tp>::value || 1159 is_class<_Tp>::value > {}; 1160 1161#if _LIBCPP_STD_VER > 14 1162template <class _Tp> 1163inline constexpr bool is_object_v = is_object<_Tp>::value; 1164#endif 1165 1166#endif // __has_keyword(__is_object) 1167 1168// is_compound 1169 1170// >= 11 because in C++03 nullptr isn't actually nullptr 1171#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG) 1172 1173template<class _Tp> 1174struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { }; 1175 1176#if _LIBCPP_STD_VER > 14 1177template <class _Tp> 1178inline constexpr bool is_compound_v = __is_compound(_Tp); 1179#endif 1180 1181#else // __has_keyword(__is_compound) 1182 1183template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1184 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1185 1186#if _LIBCPP_STD_VER > 14 1187template <class _Tp> 1188inline constexpr bool is_compound_v = is_compound<_Tp>::value; 1189#endif 1190 1191#endif // __has_keyword(__is_compound) 1192 1193// __is_referenceable [defns.referenceable] 1194 1195struct __is_referenceable_impl { 1196 template <class _Tp> static _Tp& __test(int); 1197 template <class _Tp> static __two __test(...); 1198}; 1199 1200template <class _Tp> 1201struct __is_referenceable : integral_constant<bool, 1202 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1203 1204 1205// add_const 1206 1207template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1208 typedef _LIBCPP_NODEBUG const _Tp type; 1209}; 1210 1211#if _LIBCPP_STD_VER > 11 1212template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1213#endif 1214 1215// add_volatile 1216 1217template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1218 typedef _LIBCPP_NODEBUG volatile _Tp type; 1219}; 1220 1221#if _LIBCPP_STD_VER > 11 1222template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1223#endif 1224 1225// add_cv 1226template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1227 typedef _LIBCPP_NODEBUG const volatile _Tp type; 1228}; 1229 1230#if _LIBCPP_STD_VER > 11 1231template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1232#endif 1233 1234// remove_reference 1235 1236template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG _Tp type;}; 1237template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG _Tp type;}; 1238template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG _Tp type;}; 1239 1240#if _LIBCPP_STD_VER > 11 1241template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1242#endif 1243 1244// add_lvalue_reference 1245 1246template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG _Tp type; }; 1247template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp& type; }; 1248 1249template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1250{typedef _LIBCPP_NODEBUG typename __add_lvalue_reference_impl<_Tp>::type type;}; 1251 1252#if _LIBCPP_STD_VER > 11 1253template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1254#endif 1255 1256template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG _Tp type; }; 1257template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp&& type; }; 1258 1259template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1260{typedef _LIBCPP_NODEBUG typename __add_rvalue_reference_impl<_Tp>::type type;}; 1261 1262#if _LIBCPP_STD_VER > 11 1263template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1264#endif 1265 1266// Suppress deprecation notice for volatile-qualified return type resulting 1267// from volatile-qualified types _Tp. 1268_LIBCPP_SUPPRESS_DEPRECATED_PUSH 1269template <class _Tp> _Tp&& __declval(int); 1270template <class _Tp> _Tp __declval(long); 1271_LIBCPP_SUPPRESS_DEPRECATED_POP 1272 1273template <class _Tp> 1274decltype(__declval<_Tp>(0)) 1275declval() _NOEXCEPT; 1276 1277// __uncvref 1278 1279template <class _Tp> 1280struct __uncvref { 1281 typedef _LIBCPP_NODEBUG typename remove_cv<typename remove_reference<_Tp>::type>::type type; 1282}; 1283 1284template <class _Tp> 1285struct __unconstref { 1286 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 1287}; 1288 1289#ifndef _LIBCPP_CXX03_LANG 1290template <class _Tp> 1291using __uncvref_t _LIBCPP_NODEBUG = typename __uncvref<_Tp>::type; 1292#endif 1293 1294// __is_same_uncvref 1295 1296template <class _Tp, class _Up> 1297struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type, 1298 typename __uncvref<_Up>::type> {}; 1299 1300#if _LIBCPP_STD_VER > 17 1301// remove_cvref - same as __uncvref 1302template <class _Tp> 1303struct remove_cvref : public __uncvref<_Tp> {}; 1304 1305template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1306#endif 1307 1308 1309struct __any 1310{ 1311 __any(...); 1312}; 1313 1314// remove_pointer 1315 1316template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG _Tp type;}; 1317template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG _Tp type;}; 1318template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG _Tp type;}; 1319template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG _Tp type;}; 1320template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG _Tp type;}; 1321 1322#if _LIBCPP_STD_VER > 11 1323template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1324#endif 1325 1326// add_pointer 1327 1328template <class _Tp, 1329 bool = __is_referenceable<_Tp>::value || 1330 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1331struct __add_pointer_impl 1332 {typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;}; 1333template <class _Tp> struct __add_pointer_impl<_Tp, false> 1334 {typedef _LIBCPP_NODEBUG _Tp type;}; 1335 1336template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1337 {typedef _LIBCPP_NODEBUG typename __add_pointer_impl<_Tp>::type type;}; 1338 1339#if _LIBCPP_STD_VER > 11 1340template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1341#endif 1342 1343// type_identity 1344#if _LIBCPP_STD_VER > 17 1345template<class _Tp> struct type_identity { typedef _Tp type; }; 1346template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1347#endif 1348 1349// is_signed 1350 1351#if __has_keyword(__is_signed) 1352 1353template<class _Tp> 1354struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { }; 1355 1356#if _LIBCPP_STD_VER > 14 1357template <class _Tp> 1358inline constexpr bool is_signed_v = __is_signed(_Tp); 1359#endif 1360 1361#else // __has_keyword(__is_signed) 1362 1363template <class _Tp, bool = is_integral<_Tp>::value> 1364struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {}; 1365 1366template <class _Tp> 1367struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1368 1369template <class _Tp, bool = is_arithmetic<_Tp>::value> 1370struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1371 1372template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1373 1374template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1375 1376#if _LIBCPP_STD_VER > 14 1377template <class _Tp> 1378inline constexpr bool is_signed_v = is_signed<_Tp>::value; 1379#endif 1380 1381#endif // __has_keyword(__is_signed) 1382 1383// is_unsigned 1384 1385// Before Clang 13, __is_unsigned returned true for enums with signed underlying type. 1386// No currently-released version of AppleClang contains the fixed intrinsic. 1387#if __has_keyword(__is_unsigned) && \ 1388 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1300) && \ 1389 !defined(_LIBCPP_APPLE_CLANG_VER) 1390 1391template<class _Tp> 1392struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { }; 1393 1394#if _LIBCPP_STD_VER > 14 1395template <class _Tp> 1396inline constexpr bool is_unsigned_v = __is_unsigned(_Tp); 1397#endif 1398 1399#else // __has_keyword(__is_unsigned) 1400 1401template <class _Tp, bool = is_integral<_Tp>::value> 1402struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {}; 1403 1404template <class _Tp> 1405struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1406 1407template <class _Tp, bool = is_arithmetic<_Tp>::value> 1408struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1409 1410template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1411 1412template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {}; 1413 1414#if _LIBCPP_STD_VER > 14 1415template <class _Tp> 1416inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; 1417#endif 1418 1419#endif // __has_keyword(__is_unsigned) 1420 1421// rank 1422 1423template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1424 : public integral_constant<size_t, 0> {}; 1425template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1426 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1427template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1428 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1429 1430#if _LIBCPP_STD_VER > 14 1431template <class _Tp> 1432inline constexpr size_t rank_v = rank<_Tp>::value; 1433#endif 1434 1435// extent 1436 1437#if __has_keyword(__array_extent) 1438 1439template<class _Tp, size_t _Dim = 0> 1440struct _LIBCPP_TEMPLATE_VIS extent 1441 : integral_constant<size_t, __array_extent(_Tp, _Dim)> { }; 1442 1443#if _LIBCPP_STD_VER > 14 1444template <class _Tp, unsigned _Ip = 0> 1445inline constexpr size_t extent_v = __array_extent(_Tp, _Ip); 1446#endif 1447 1448#else // __has_keyword(__array_extent) 1449 1450template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1451 : public integral_constant<size_t, 0> {}; 1452template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1453 : public integral_constant<size_t, 0> {}; 1454template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1455 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1456template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1457 : public integral_constant<size_t, _Np> {}; 1458template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1459 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1460 1461#if _LIBCPP_STD_VER > 14 1462template <class _Tp, unsigned _Ip = 0> 1463inline constexpr size_t extent_v = extent<_Tp, _Ip>::value; 1464#endif 1465 1466#endif // __has_keyword(__array_extent) 1467 1468// remove_extent 1469 1470template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1471 {typedef _Tp type;}; 1472template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1473 {typedef _Tp type;}; 1474template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1475 {typedef _Tp type;}; 1476 1477#if _LIBCPP_STD_VER > 11 1478template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1479#endif 1480 1481// remove_all_extents 1482 1483template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1484 {typedef _Tp type;}; 1485template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1486 {typedef typename remove_all_extents<_Tp>::type type;}; 1487template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1488 {typedef typename remove_all_extents<_Tp>::type type;}; 1489 1490#if _LIBCPP_STD_VER > 11 1491template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1492#endif 1493 1494#if _LIBCPP_STD_VER > 17 1495// is_bounded_array 1496 1497template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1498template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1499 1500template <class _Tp> 1501inline constexpr 1502bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1503 1504// is_unbounded_array 1505 1506template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1507template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1508 1509template <class _Tp> 1510inline constexpr 1511bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1512#endif 1513 1514// decay 1515 1516template <class _Up, bool> 1517struct __decay { 1518 typedef _LIBCPP_NODEBUG typename remove_cv<_Up>::type type; 1519}; 1520 1521template <class _Up> 1522struct __decay<_Up, true> { 1523public: 1524 typedef _LIBCPP_NODEBUG typename conditional 1525 < 1526 is_array<_Up>::value, 1527 typename remove_extent<_Up>::type*, 1528 typename conditional 1529 < 1530 is_function<_Up>::value, 1531 typename add_pointer<_Up>::type, 1532 typename remove_cv<_Up>::type 1533 >::type 1534 >::type type; 1535}; 1536 1537template <class _Tp> 1538struct _LIBCPP_TEMPLATE_VIS decay 1539{ 1540private: 1541 typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up; 1542public: 1543 typedef _LIBCPP_NODEBUG typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1544}; 1545 1546#if _LIBCPP_STD_VER > 11 1547template <class _Tp> using decay_t = typename decay<_Tp>::type; 1548#endif 1549 1550// is_abstract 1551 1552template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1553 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1554 1555#if _LIBCPP_STD_VER > 14 1556template <class _Tp> 1557inline constexpr bool is_abstract_v = is_abstract<_Tp>::value; 1558#endif 1559 1560// is_final 1561 1562template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1563__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1564 1565#if _LIBCPP_STD_VER > 11 1566template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1567is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1568#endif 1569 1570#if _LIBCPP_STD_VER > 14 1571template <class _Tp> 1572inline constexpr bool is_final_v = is_final<_Tp>::value; 1573#endif 1574 1575// is_aggregate 1576#if _LIBCPP_STD_VER > 14 1577 1578template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1579is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1580 1581template <class _Tp> 1582inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value; 1583 1584#endif // _LIBCPP_STD_VER > 14 1585 1586// is_base_of 1587 1588template <class _Bp, class _Dp> 1589struct _LIBCPP_TEMPLATE_VIS is_base_of 1590 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1591 1592#if _LIBCPP_STD_VER > 14 1593template <class _Bp, class _Dp> 1594inline constexpr bool is_base_of_v = is_base_of<_Bp, _Dp>::value; 1595#endif 1596 1597// __is_core_convertible 1598 1599// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed. 1600// We can't test for that, but we can test implicit convertibility by passing it 1601// to a function. Notice that __is_core_convertible<void,void> is false, 1602// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later. 1603 1604template <class _Tp, class _Up, class = void> 1605struct __is_core_convertible : public false_type {}; 1606 1607template <class _Tp, class _Up> 1608struct __is_core_convertible<_Tp, _Up, decltype( 1609 static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() ) 1610)> : public true_type {}; 1611 1612// is_convertible 1613 1614#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1615 1616template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1617 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 1618 1619#else // __has_feature(is_convertible_to) 1620 1621namespace __is_convertible_imp 1622{ 1623template <class _Tp> void __test_convert(_Tp); 1624 1625template <class _From, class _To, class = void> 1626struct __is_convertible_test : public false_type {}; 1627 1628template <class _From, class _To> 1629struct __is_convertible_test<_From, _To, 1630 decltype(__is_convertible_imp::__test_convert<_To>(declval<_From>()))> : public true_type 1631{}; 1632 1633template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1634 bool _IsFunction = is_function<_Tp>::value, 1635 bool _IsVoid = is_void<_Tp>::value> 1636 struct __is_array_function_or_void {enum {value = 0};}; 1637template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1638template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1639template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1640} 1641 1642template <class _Tp, 1643 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1644struct __is_convertible_check 1645{ 1646 static const size_t __v = 0; 1647}; 1648 1649template <class _Tp> 1650struct __is_convertible_check<_Tp, 0> 1651{ 1652 static const size_t __v = sizeof(_Tp); 1653}; 1654 1655template <class _T1, class _T2, 1656 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1657 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1658struct __is_convertible 1659 : public integral_constant<bool, 1660 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1661 > 1662{}; 1663 1664template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1665template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1666template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1667template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1668 1669template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1670template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1671template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1672template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1673 1674template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1675template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1676template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1677template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1678 1679template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1680 : public __is_convertible<_T1, _T2> 1681{ 1682 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1683 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1684}; 1685 1686#endif // __has_feature(is_convertible_to) 1687 1688#if _LIBCPP_STD_VER > 14 1689template <class _From, class _To> 1690inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; 1691#endif 1692 1693// is_nothrow_convertible 1694 1695#if _LIBCPP_STD_VER > 17 1696 1697template <typename _Tp> 1698static void __test_noexcept(_Tp) noexcept; 1699 1700template<typename _Fm, typename _To> 1701static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 1702__is_nothrow_convertible_test(); 1703 1704template <typename _Fm, typename _To> 1705struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1706{ }; 1707 1708template <typename _Fm, typename _To> 1709struct is_nothrow_convertible : _Or< 1710 _And<is_void<_To>, is_void<_Fm>>, 1711 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1712>::type { }; 1713 1714template <typename _Fm, typename _To> 1715inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1716 1717#endif // _LIBCPP_STD_VER > 17 1718 1719// is_empty 1720 1721#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1722 1723template <class _Tp> 1724struct _LIBCPP_TEMPLATE_VIS is_empty 1725 : public integral_constant<bool, __is_empty(_Tp)> {}; 1726 1727#else // __has_feature(is_empty) 1728 1729template <class _Tp> 1730struct __is_empty1 1731 : public _Tp 1732{ 1733 double __lx; 1734}; 1735 1736struct __is_empty2 1737{ 1738 double __lx; 1739}; 1740 1741template <class _Tp, bool = is_class<_Tp>::value> 1742struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1743 1744template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1745 1746template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1747 1748#endif // __has_feature(is_empty) 1749 1750#if _LIBCPP_STD_VER > 14 1751template <class _Tp> 1752inline constexpr bool is_empty_v = is_empty<_Tp>::value; 1753#endif 1754 1755// is_polymorphic 1756 1757#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1758 1759template <class _Tp> 1760struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1761 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1762 1763#else 1764 1765template<typename _Tp> char &__is_polymorphic_impl( 1766 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1767 int>::type); 1768template<typename _Tp> __two &__is_polymorphic_impl(...); 1769 1770template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1771 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1772 1773#endif // __has_feature(is_polymorphic) 1774 1775#if _LIBCPP_STD_VER > 14 1776template <class _Tp> 1777inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value; 1778#endif 1779 1780// has_virtual_destructor 1781 1782#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1783 1784template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1785 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1786 1787#else 1788 1789template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1790 : public false_type {}; 1791 1792#endif 1793 1794#if _LIBCPP_STD_VER > 14 1795template <class _Tp> 1796inline constexpr bool has_virtual_destructor_v = has_virtual_destructor<_Tp>::value; 1797#endif 1798 1799// has_unique_object_representations 1800 1801#if _LIBCPP_STD_VER > 14 1802 1803template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1804 : public integral_constant<bool, 1805 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1806 1807template <class _Tp> 1808inline constexpr bool has_unique_object_representations_v = has_unique_object_representations<_Tp>::value; 1809 1810#endif 1811 1812// alignment_of 1813 1814template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1815 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1816 1817#if _LIBCPP_STD_VER > 14 1818template <class _Tp> 1819inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; 1820#endif 1821 1822// aligned_storage 1823 1824template <class _Hp, class _Tp> 1825struct __type_list 1826{ 1827 typedef _Hp _Head; 1828 typedef _Tp _Tail; 1829}; 1830 1831struct __nat 1832{ 1833#ifndef _LIBCPP_CXX03_LANG 1834 __nat() = delete; 1835 __nat(const __nat&) = delete; 1836 __nat& operator=(const __nat&) = delete; 1837 ~__nat() = delete; 1838#endif 1839}; 1840 1841template <class _Tp> 1842struct __align_type 1843{ 1844 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1845 typedef _Tp type; 1846}; 1847 1848struct __struct_double {long double __lx;}; 1849struct __struct_double4 {double __lx[4];}; 1850 1851typedef 1852 __type_list<__align_type<unsigned char>, 1853 __type_list<__align_type<unsigned short>, 1854 __type_list<__align_type<unsigned int>, 1855 __type_list<__align_type<unsigned long>, 1856 __type_list<__align_type<unsigned long long>, 1857 __type_list<__align_type<double>, 1858 __type_list<__align_type<long double>, 1859 __type_list<__align_type<__struct_double>, 1860 __type_list<__align_type<__struct_double4>, 1861 __type_list<__align_type<int*>, 1862 __nat 1863 > > > > > > > > > > __all_types; 1864 1865template <size_t _Align> 1866struct _ALIGNAS(_Align) __fallback_overaligned {}; 1867 1868template <class _TL, size_t _Align> struct __find_pod; 1869 1870template <class _Hp, size_t _Align> 1871struct __find_pod<__type_list<_Hp, __nat>, _Align> 1872{ 1873 typedef typename conditional< 1874 _Align == _Hp::value, 1875 typename _Hp::type, 1876 __fallback_overaligned<_Align> 1877 >::type type; 1878}; 1879 1880template <class _Hp, class _Tp, size_t _Align> 1881struct __find_pod<__type_list<_Hp, _Tp>, _Align> 1882{ 1883 typedef typename conditional< 1884 _Align == _Hp::value, 1885 typename _Hp::type, 1886 typename __find_pod<_Tp, _Align>::type 1887 >::type type; 1888}; 1889 1890template <class _TL, size_t _Len> struct __find_max_align; 1891 1892template <class _Hp, size_t _Len> 1893struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 1894 1895template <size_t _Len, size_t _A1, size_t _A2> 1896struct __select_align 1897{ 1898private: 1899 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 1900 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 1901public: 1902 static const size_t value = _Len < __max ? __min : __max; 1903}; 1904 1905template <class _Hp, class _Tp, size_t _Len> 1906struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 1907 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 1908 1909template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1910struct _LIBCPP_TEMPLATE_VIS aligned_storage 1911{ 1912 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 1913 union type 1914 { 1915 _Aligner __align; 1916 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 1917 }; 1918}; 1919 1920#if _LIBCPP_STD_VER > 11 1921template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1922 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 1923#endif 1924 1925#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 1926template <size_t _Len>\ 1927struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 1928{\ 1929 struct _ALIGNAS(n) type\ 1930 {\ 1931 unsigned char __lx[(_Len + n - 1)/n * n];\ 1932 };\ 1933} 1934 1935_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 1936_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 1937_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 1938_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 1939_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 1940_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 1941_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 1942_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 1943_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 1944_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 1945_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 1946_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 1947_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 1948_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 1949// PE/COFF does not support alignment beyond 8192 (=0x2000) 1950#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1951_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 1952#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1953 1954#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 1955 1956 1957// aligned_union 1958 1959template <size_t _I0, size_t ..._In> 1960struct __static_max; 1961 1962template <size_t _I0> 1963struct __static_max<_I0> 1964{ 1965 static const size_t value = _I0; 1966}; 1967 1968template <size_t _I0, size_t _I1, size_t ..._In> 1969struct __static_max<_I0, _I1, _In...> 1970{ 1971 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 1972 __static_max<_I1, _In...>::value; 1973}; 1974 1975template <size_t _Len, class _Type0, class ..._Types> 1976struct aligned_union 1977{ 1978 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 1979 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 1980 static const size_t __len = __static_max<_Len, sizeof(_Type0), 1981 sizeof(_Types)...>::value; 1982 typedef typename aligned_storage<__len, alignment_value>::type type; 1983}; 1984 1985#if _LIBCPP_STD_VER > 11 1986template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 1987#endif 1988 1989template <class _Tp> 1990struct __numeric_type 1991{ 1992 static void __test(...); 1993 static float __test(float); 1994 static double __test(char); 1995 static double __test(int); 1996 static double __test(unsigned); 1997 static double __test(long); 1998 static double __test(unsigned long); 1999 static double __test(long long); 2000 static double __test(unsigned long long); 2001 static double __test(double); 2002 static long double __test(long double); 2003 2004 typedef decltype(__test(declval<_Tp>())) type; 2005 static const bool value = _IsNotSame<type, void>::value; 2006}; 2007 2008template <> 2009struct __numeric_type<void> 2010{ 2011 static const bool value = true; 2012}; 2013 2014// __promote 2015 2016template <class _A1, class _A2 = void, class _A3 = void, 2017 bool = __numeric_type<_A1>::value && 2018 __numeric_type<_A2>::value && 2019 __numeric_type<_A3>::value> 2020class __promote_imp 2021{ 2022public: 2023 static const bool value = false; 2024}; 2025 2026template <class _A1, class _A2, class _A3> 2027class __promote_imp<_A1, _A2, _A3, true> 2028{ 2029private: 2030 typedef typename __promote_imp<_A1>::type __type1; 2031 typedef typename __promote_imp<_A2>::type __type2; 2032 typedef typename __promote_imp<_A3>::type __type3; 2033public: 2034 typedef decltype(__type1() + __type2() + __type3()) type; 2035 static const bool value = true; 2036}; 2037 2038template <class _A1, class _A2> 2039class __promote_imp<_A1, _A2, void, true> 2040{ 2041private: 2042 typedef typename __promote_imp<_A1>::type __type1; 2043 typedef typename __promote_imp<_A2>::type __type2; 2044public: 2045 typedef decltype(__type1() + __type2()) type; 2046 static const bool value = true; 2047}; 2048 2049template <class _A1> 2050class __promote_imp<_A1, void, void, true> 2051{ 2052public: 2053 typedef typename __numeric_type<_A1>::type type; 2054 static const bool value = true; 2055}; 2056 2057template <class _A1, class _A2 = void, class _A3 = void> 2058class __promote : public __promote_imp<_A1, _A2, _A3> {}; 2059 2060// make_signed / make_unsigned 2061 2062typedef 2063 __type_list<signed char, 2064 __type_list<signed short, 2065 __type_list<signed int, 2066 __type_list<signed long, 2067 __type_list<signed long long, 2068#ifndef _LIBCPP_HAS_NO_INT128 2069 __type_list<__int128_t, 2070#endif 2071 __nat 2072#ifndef _LIBCPP_HAS_NO_INT128 2073 > 2074#endif 2075 > > > > > __signed_types; 2076 2077typedef 2078 __type_list<unsigned char, 2079 __type_list<unsigned short, 2080 __type_list<unsigned int, 2081 __type_list<unsigned long, 2082 __type_list<unsigned long long, 2083#ifndef _LIBCPP_HAS_NO_INT128 2084 __type_list<__uint128_t, 2085#endif 2086 __nat 2087#ifndef _LIBCPP_HAS_NO_INT128 2088 > 2089#endif 2090 > > > > > __unsigned_types; 2091 2092template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 2093 2094template <class _Hp, class _Tp, size_t _Size> 2095struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 2096{ 2097 typedef _LIBCPP_NODEBUG _Hp type; 2098}; 2099 2100template <class _Hp, class _Tp, size_t _Size> 2101struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 2102{ 2103 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 2104}; 2105 2106template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 2107 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 2108struct __apply_cv 2109{ 2110 typedef _LIBCPP_NODEBUG _Up type; 2111}; 2112 2113template <class _Tp, class _Up> 2114struct __apply_cv<_Tp, _Up, true, false> 2115{ 2116 typedef _LIBCPP_NODEBUG const _Up type; 2117}; 2118 2119template <class _Tp, class _Up> 2120struct __apply_cv<_Tp, _Up, false, true> 2121{ 2122 typedef volatile _Up type; 2123}; 2124 2125template <class _Tp, class _Up> 2126struct __apply_cv<_Tp, _Up, true, true> 2127{ 2128 typedef const volatile _Up type; 2129}; 2130 2131template <class _Tp, class _Up> 2132struct __apply_cv<_Tp&, _Up, false, false> 2133{ 2134 typedef _Up& type; 2135}; 2136 2137template <class _Tp, class _Up> 2138struct __apply_cv<_Tp&, _Up, true, false> 2139{ 2140 typedef const _Up& type; 2141}; 2142 2143template <class _Tp, class _Up> 2144struct __apply_cv<_Tp&, _Up, false, true> 2145{ 2146 typedef volatile _Up& type; 2147}; 2148 2149template <class _Tp, class _Up> 2150struct __apply_cv<_Tp&, _Up, true, true> 2151{ 2152 typedef const volatile _Up& type; 2153}; 2154 2155template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2156struct __make_signed {}; 2157 2158template <class _Tp> 2159struct __make_signed<_Tp, true> 2160{ 2161 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 2162}; 2163 2164template <> struct __make_signed<bool, true> {}; 2165template <> struct __make_signed< signed short, true> {typedef short type;}; 2166template <> struct __make_signed<unsigned short, true> {typedef short type;}; 2167template <> struct __make_signed< signed int, true> {typedef int type;}; 2168template <> struct __make_signed<unsigned int, true> {typedef int type;}; 2169template <> struct __make_signed< signed long, true> {typedef long type;}; 2170template <> struct __make_signed<unsigned long, true> {typedef long type;}; 2171template <> struct __make_signed< signed long long, true> {typedef long long type;}; 2172template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 2173#ifndef _LIBCPP_HAS_NO_INT128 2174template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 2175template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 2176#endif 2177 2178template <class _Tp> 2179struct _LIBCPP_TEMPLATE_VIS make_signed 2180{ 2181 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 2182}; 2183 2184#if _LIBCPP_STD_VER > 11 2185template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 2186#endif 2187 2188template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2189struct __make_unsigned {}; 2190 2191template <class _Tp> 2192struct __make_unsigned<_Tp, true> 2193{ 2194 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2195}; 2196 2197template <> struct __make_unsigned<bool, true> {}; 2198template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2199template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2200template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2201template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2202template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2203template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2204template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2205template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2206#ifndef _LIBCPP_HAS_NO_INT128 2207template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2208template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2209#endif 2210 2211template <class _Tp> 2212struct _LIBCPP_TEMPLATE_VIS make_unsigned 2213{ 2214 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2215}; 2216 2217#if _LIBCPP_STD_VER > 11 2218template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2219#endif 2220 2221#ifndef _LIBCPP_CXX03_LANG 2222template <class _Tp> 2223_LIBCPP_HIDE_FROM_ABI constexpr 2224typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 2225 return static_cast<typename make_unsigned<_Tp>::type>(__x); 2226} 2227#endif 2228 2229#if _LIBCPP_STD_VER > 14 2230template <class...> using void_t = void; 2231#endif 2232 2233#if _LIBCPP_STD_VER > 17 2234// Let COND_RES(X, Y) be: 2235template <class _Tp, class _Up> 2236using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 2237 2238template <class _Tp, class _Up, class = void> 2239struct __common_type3 {}; 2240 2241// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 2242template <class _Tp, class _Up> 2243struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 2244{ 2245 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 2246}; 2247 2248template <class _Tp, class _Up, class = void> 2249struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 2250#else 2251template <class _Tp, class _Up, class = void> 2252struct __common_type2_imp {}; 2253#endif 2254 2255// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 2256template <class _Tp, class _Up> 2257struct __common_type2_imp<_Tp, _Up, 2258 typename __void_t<decltype( 2259 true ? declval<_Tp>() : declval<_Up>() 2260 )>::type> 2261{ 2262 typedef _LIBCPP_NODEBUG typename decay<decltype( 2263 true ? declval<_Tp>() : declval<_Up>() 2264 )>::type type; 2265}; 2266 2267template <class, class = void> 2268struct __common_type_impl {}; 2269 2270// Clang provides variadic templates in C++03 as an extension. 2271#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2272# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2273template <class... _Tp> 2274struct __common_types; 2275template <class... _Tp> 2276struct _LIBCPP_TEMPLATE_VIS common_type; 2277#else 2278# define _LIBCPP_OPTIONAL_PACK(...) 2279struct __no_arg; 2280template <class _Tp, class _Up, class = __no_arg> 2281struct __common_types; 2282template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2283 class _Unused = __no_arg> 2284struct common_type { 2285 static_assert(sizeof(_Unused) == 0, 2286 "common_type accepts at most 3 arguments in C++03"); 2287}; 2288#endif // _LIBCPP_CXX03_LANG 2289 2290template <class _Tp, class _Up> 2291struct __common_type_impl< 2292 __common_types<_Tp, _Up>, 2293 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2294{ 2295 typedef typename common_type<_Tp, _Up>::type type; 2296}; 2297 2298template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2299struct __common_type_impl< 2300 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2301 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2302 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2303 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2304}; 2305 2306// bullet 1 - sizeof...(Tp) == 0 2307 2308template <> 2309struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2310 2311// bullet 2 - sizeof...(Tp) == 1 2312 2313template <class _Tp> 2314struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2315 : public common_type<_Tp, _Tp> {}; 2316 2317// bullet 3 - sizeof...(Tp) == 2 2318 2319// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 2320template <class _Tp, class _Up> 2321struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2322 : conditional< 2323 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2324 __common_type2_imp<_Tp, _Up>, 2325 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2326 >::type 2327{}; 2328 2329// bullet 4 - sizeof...(Tp) > 2 2330 2331template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2332struct _LIBCPP_TEMPLATE_VIS 2333 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2334 : __common_type_impl< 2335 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2336 2337#undef _LIBCPP_OPTIONAL_PACK 2338 2339#if _LIBCPP_STD_VER > 11 2340template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2341#endif 2342 2343#if _LIBCPP_STD_VER > 11 2344// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 2345// top-level cv-qualifiers. 2346template <class _From, class _To> 2347struct __copy_cv 2348{ 2349 using type = _To; 2350}; 2351 2352template <class _From, class _To> 2353struct __copy_cv<const _From, _To> 2354{ 2355 using type = add_const_t<_To>; 2356}; 2357 2358template <class _From, class _To> 2359struct __copy_cv<volatile _From, _To> 2360{ 2361 using type = add_volatile_t<_To>; 2362}; 2363 2364template <class _From, class _To> 2365struct __copy_cv<const volatile _From, _To> 2366{ 2367 using type = add_cv_t<_To>; 2368}; 2369 2370template <class _From, class _To> 2371using __copy_cv_t = typename __copy_cv<_From, _To>::type; 2372 2373template <class _From, class _To> 2374struct __copy_cvref 2375{ 2376 using type = __copy_cv_t<_From, _To>; 2377}; 2378 2379template <class _From, class _To> 2380struct __copy_cvref<_From&, _To> 2381{ 2382 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 2383}; 2384 2385template <class _From, class _To> 2386struct __copy_cvref<_From&&, _To> 2387{ 2388 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 2389}; 2390 2391template <class _From, class _To> 2392using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 2393 2394#endif // _LIBCPP_STD_VER > 11 2395 2396// common_reference 2397#if !defined(_LIBCPP_HAS_NO_CONCEPTS) 2398// Let COND_RES(X, Y) be: 2399template <class _Xp, class _Yp> 2400using __cond_res = 2401 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 2402 2403// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 2404// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 2405// `U`. 2406// [Note: `XREF(A)` is `__xref<A>::template __apply`] 2407template <class _Tp> 2408struct __xref { 2409 template<class _Up> 2410 using __apply = __copy_cvref_t<_Tp, _Up>; 2411}; 2412 2413// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 2414// and let COMMON-REF(A, B) be: 2415template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 2416struct __common_ref; 2417 2418template<class _Xp, class _Yp> 2419using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 2420 2421template<class _Xp, class _Yp> 2422using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 2423 2424 2425// If A and B are both lvalue reference types, COMMON-REF(A, B) is 2426// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 2427template<class _Ap, class _Bp, class _Xp, class _Yp> 2428requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 2429struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 2430{ 2431 using __type = __cv_cond_res<_Xp, _Yp>; 2432}; 2433 2434// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 2435template <class _Xp, class _Yp> 2436using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 2437 2438 2439// .... If A and B are both rvalue reference types, C is well-formed, and 2440// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 2441template<class _Ap, class _Bp, class _Xp, class _Yp> 2442requires 2443 requires { typename __common_ref_C<_Xp, _Yp>; } && 2444 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 2445 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 2446struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 2447{ 2448 using __type = __common_ref_C<_Xp, _Yp>; 2449}; 2450 2451// Otherwise, let D be COMMON-REF(const X&, Y&). ... 2452template <class _Tp, class _Up> 2453using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 2454 2455// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 2456// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 2457template<class _Ap, class _Bp, class _Xp, class _Yp> 2458requires requires { typename __common_ref_D<_Xp, _Yp>; } && 2459 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 2460struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 2461{ 2462 using __type = __common_ref_D<_Xp, _Yp>; 2463}; 2464 2465// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 2466// COMMON-REF(A, B) is COMMON-REF(B, A). 2467template<class _Ap, class _Bp, class _Xp, class _Yp> 2468struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 2469 2470// Otherwise, COMMON-REF(A, B) is ill-formed. 2471template<class _Ap, class _Bp, class _Xp, class _Yp> 2472struct __common_ref {}; 2473 2474// Note C: For the common_reference trait applied to a parameter pack [...] 2475 2476template <class...> 2477struct common_reference; 2478 2479template <class... _Types> 2480using common_reference_t = typename common_reference<_Types...>::type; 2481 2482// bullet 1 - sizeof...(T) == 0 2483template<> 2484struct common_reference<> {}; 2485 2486// bullet 2 - sizeof...(T) == 1 2487template <class _Tp> 2488struct common_reference<_Tp> 2489{ 2490 using type = _Tp; 2491}; 2492 2493// bullet 3 - sizeof...(T) == 2 2494template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 2495template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 2496template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 2497 2498// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 2499// the member typedef `type` denotes that type. 2500template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 2501 2502template <class _Tp, class _Up> 2503requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 2504struct __common_reference_sub_bullet1<_Tp, _Up> 2505{ 2506 using type = __common_ref_t<_Tp, _Up>; 2507}; 2508 2509// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 2510// is well-formed, then the member typedef `type` denotes that type. 2511template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 2512 2513template <class _Tp, class _Up> 2514using __basic_common_reference_t = typename basic_common_reference< 2515 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 2516 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 2517 2518template <class _Tp, class _Up> 2519requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 2520struct __common_reference_sub_bullet2<_Tp, _Up> 2521{ 2522 using type = __basic_common_reference_t<_Tp, _Up>; 2523}; 2524 2525// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 2526// then the member typedef `type` denotes that type. 2527template <class _Tp, class _Up> 2528requires requires { typename __cond_res<_Tp, _Up>; } 2529struct __common_reference_sub_bullet3<_Tp, _Up> 2530{ 2531 using type = __cond_res<_Tp, _Up>; 2532}; 2533 2534 2535// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 2536// then the member typedef `type` denotes that type. 2537// - Otherwise, there shall be no member `type`. 2538template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 2539 2540// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 2541// any, as `common_reference_t<C, Rest...>`. 2542template <class _Tp, class _Up, class _Vp, class... _Rest> 2543requires requires { typename common_reference_t<_Tp, _Up>; } 2544struct common_reference<_Tp, _Up, _Vp, _Rest...> 2545 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 2546{}; 2547 2548// bullet 5 - Otherwise, there shall be no member `type`. 2549template <class...> struct common_reference {}; 2550 2551#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS) 2552 2553// is_assignable 2554 2555template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG _Tp type; }; 2556 2557#if __has_keyword(__is_assignable) 2558 2559template<class _Tp, class _Up> 2560struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { }; 2561 2562#if _LIBCPP_STD_VER > 14 2563template <class _Tp, class _Arg> 2564inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Arg); 2565#endif 2566 2567#else // __has_keyword(__is_assignable) 2568 2569template <class _Tp, class _Arg> 2570typename __select_2nd<decltype((declval<_Tp>() = declval<_Arg>())), true_type>::type 2571__is_assignable_test(int); 2572 2573template <class, class> 2574false_type __is_assignable_test(...); 2575 2576 2577template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2578struct __is_assignable_imp 2579 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2580 2581template <class _Tp, class _Arg> 2582struct __is_assignable_imp<_Tp, _Arg, true> 2583 : public false_type 2584{ 2585}; 2586 2587template <class _Tp, class _Arg> 2588struct is_assignable 2589 : public __is_assignable_imp<_Tp, _Arg> {}; 2590 2591#if _LIBCPP_STD_VER > 14 2592template <class _Tp, class _Arg> 2593inline constexpr bool is_assignable_v = is_assignable<_Tp, _Arg>::value; 2594#endif 2595 2596#endif // __has_keyword(__is_assignable) 2597 2598// is_copy_assignable 2599 2600template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2601 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2602 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2603 2604#if _LIBCPP_STD_VER > 14 2605template <class _Tp> 2606inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value; 2607#endif 2608 2609// is_move_assignable 2610 2611template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2612 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2613 typename add_rvalue_reference<_Tp>::type> {}; 2614 2615#if _LIBCPP_STD_VER > 14 2616template <class _Tp> 2617inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value; 2618#endif 2619 2620// is_destructible 2621 2622#if __has_keyword(__is_destructible) 2623 2624template<class _Tp> 2625struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 2626 2627#if _LIBCPP_STD_VER > 14 2628template <class _Tp> 2629inline constexpr bool is_destructible_v = __is_destructible(_Tp); 2630#endif 2631 2632#else // __has_keyword(__is_destructible) 2633 2634// if it's a reference, return true 2635// if it's a function, return false 2636// if it's void, return false 2637// if it's an array of unknown bound, return false 2638// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 2639// where _Up is remove_all_extents<_Tp>::type 2640 2641template <class> 2642struct __is_destructible_apply { typedef int type; }; 2643 2644template <typename _Tp> 2645struct __is_destructor_wellformed { 2646 template <typename _Tp1> 2647 static char __test ( 2648 typename __is_destructible_apply<decltype(declval<_Tp1&>().~_Tp1())>::type 2649 ); 2650 2651 template <typename _Tp1> 2652 static __two __test (...); 2653 2654 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2655}; 2656 2657template <class _Tp, bool> 2658struct __destructible_imp; 2659 2660template <class _Tp> 2661struct __destructible_imp<_Tp, false> 2662 : public integral_constant<bool, 2663 __is_destructor_wellformed<typename remove_all_extents<_Tp>::type>::value> {}; 2664 2665template <class _Tp> 2666struct __destructible_imp<_Tp, true> 2667 : public true_type {}; 2668 2669template <class _Tp, bool> 2670struct __destructible_false; 2671 2672template <class _Tp> 2673struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, is_reference<_Tp>::value> {}; 2674 2675template <class _Tp> 2676struct __destructible_false<_Tp, true> : public false_type {}; 2677 2678template <class _Tp> 2679struct is_destructible 2680 : public __destructible_false<_Tp, is_function<_Tp>::value> {}; 2681 2682template <class _Tp> 2683struct is_destructible<_Tp[]> 2684 : public false_type {}; 2685 2686template <> 2687struct is_destructible<void> 2688 : public false_type {}; 2689 2690#if _LIBCPP_STD_VER > 14 2691template <class _Tp> 2692inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; 2693#endif 2694 2695#endif // __has_keyword(__is_destructible) 2696 2697template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2698struct __member_pointer_traits_imp 2699{ 2700}; 2701 2702template <class _Rp, class _Class, class ..._Param> 2703struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 2704{ 2705 typedef _Class _ClassType; 2706 typedef _Rp _ReturnType; 2707 typedef _Rp (_FnType) (_Param...); 2708}; 2709 2710template <class _Rp, class _Class, class ..._Param> 2711struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 2712{ 2713 typedef _Class _ClassType; 2714 typedef _Rp _ReturnType; 2715 typedef _Rp (_FnType) (_Param..., ...); 2716}; 2717 2718template <class _Rp, class _Class, class ..._Param> 2719struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 2720{ 2721 typedef _Class const _ClassType; 2722 typedef _Rp _ReturnType; 2723 typedef _Rp (_FnType) (_Param...); 2724}; 2725 2726template <class _Rp, class _Class, class ..._Param> 2727struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 2728{ 2729 typedef _Class const _ClassType; 2730 typedef _Rp _ReturnType; 2731 typedef _Rp (_FnType) (_Param..., ...); 2732}; 2733 2734template <class _Rp, class _Class, class ..._Param> 2735struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 2736{ 2737 typedef _Class volatile _ClassType; 2738 typedef _Rp _ReturnType; 2739 typedef _Rp (_FnType) (_Param...); 2740}; 2741 2742template <class _Rp, class _Class, class ..._Param> 2743struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 2744{ 2745 typedef _Class volatile _ClassType; 2746 typedef _Rp _ReturnType; 2747 typedef _Rp (_FnType) (_Param..., ...); 2748}; 2749 2750template <class _Rp, class _Class, class ..._Param> 2751struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 2752{ 2753 typedef _Class const volatile _ClassType; 2754 typedef _Rp _ReturnType; 2755 typedef _Rp (_FnType) (_Param...); 2756}; 2757 2758template <class _Rp, class _Class, class ..._Param> 2759struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2760{ 2761 typedef _Class const volatile _ClassType; 2762 typedef _Rp _ReturnType; 2763 typedef _Rp (_FnType) (_Param..., ...); 2764}; 2765 2766#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2767 2768template <class _Rp, class _Class, class ..._Param> 2769struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 2770{ 2771 typedef _Class& _ClassType; 2772 typedef _Rp _ReturnType; 2773 typedef _Rp (_FnType) (_Param...); 2774}; 2775 2776template <class _Rp, class _Class, class ..._Param> 2777struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 2778{ 2779 typedef _Class& _ClassType; 2780 typedef _Rp _ReturnType; 2781 typedef _Rp (_FnType) (_Param..., ...); 2782}; 2783 2784template <class _Rp, class _Class, class ..._Param> 2785struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 2786{ 2787 typedef _Class const& _ClassType; 2788 typedef _Rp _ReturnType; 2789 typedef _Rp (_FnType) (_Param...); 2790}; 2791 2792template <class _Rp, class _Class, class ..._Param> 2793struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 2794{ 2795 typedef _Class const& _ClassType; 2796 typedef _Rp _ReturnType; 2797 typedef _Rp (_FnType) (_Param..., ...); 2798}; 2799 2800template <class _Rp, class _Class, class ..._Param> 2801struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 2802{ 2803 typedef _Class volatile& _ClassType; 2804 typedef _Rp _ReturnType; 2805 typedef _Rp (_FnType) (_Param...); 2806}; 2807 2808template <class _Rp, class _Class, class ..._Param> 2809struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 2810{ 2811 typedef _Class volatile& _ClassType; 2812 typedef _Rp _ReturnType; 2813 typedef _Rp (_FnType) (_Param..., ...); 2814}; 2815 2816template <class _Rp, class _Class, class ..._Param> 2817struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 2818{ 2819 typedef _Class const volatile& _ClassType; 2820 typedef _Rp _ReturnType; 2821 typedef _Rp (_FnType) (_Param...); 2822}; 2823 2824template <class _Rp, class _Class, class ..._Param> 2825struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 2826{ 2827 typedef _Class const volatile& _ClassType; 2828 typedef _Rp _ReturnType; 2829 typedef _Rp (_FnType) (_Param..., ...); 2830}; 2831 2832template <class _Rp, class _Class, class ..._Param> 2833struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 2834{ 2835 typedef _Class&& _ClassType; 2836 typedef _Rp _ReturnType; 2837 typedef _Rp (_FnType) (_Param...); 2838}; 2839 2840template <class _Rp, class _Class, class ..._Param> 2841struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 2842{ 2843 typedef _Class&& _ClassType; 2844 typedef _Rp _ReturnType; 2845 typedef _Rp (_FnType) (_Param..., ...); 2846}; 2847 2848template <class _Rp, class _Class, class ..._Param> 2849struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 2850{ 2851 typedef _Class const&& _ClassType; 2852 typedef _Rp _ReturnType; 2853 typedef _Rp (_FnType) (_Param...); 2854}; 2855 2856template <class _Rp, class _Class, class ..._Param> 2857struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 2858{ 2859 typedef _Class const&& _ClassType; 2860 typedef _Rp _ReturnType; 2861 typedef _Rp (_FnType) (_Param..., ...); 2862}; 2863 2864template <class _Rp, class _Class, class ..._Param> 2865struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 2866{ 2867 typedef _Class volatile&& _ClassType; 2868 typedef _Rp _ReturnType; 2869 typedef _Rp (_FnType) (_Param...); 2870}; 2871 2872template <class _Rp, class _Class, class ..._Param> 2873struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 2874{ 2875 typedef _Class volatile&& _ClassType; 2876 typedef _Rp _ReturnType; 2877 typedef _Rp (_FnType) (_Param..., ...); 2878}; 2879 2880template <class _Rp, class _Class, class ..._Param> 2881struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 2882{ 2883 typedef _Class const volatile&& _ClassType; 2884 typedef _Rp _ReturnType; 2885 typedef _Rp (_FnType) (_Param...); 2886}; 2887 2888template <class _Rp, class _Class, class ..._Param> 2889struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 2890{ 2891 typedef _Class const volatile&& _ClassType; 2892 typedef _Rp _ReturnType; 2893 typedef _Rp (_FnType) (_Param..., ...); 2894}; 2895 2896#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2897 2898 2899template <class _Rp, class _Class> 2900struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 2901{ 2902 typedef _Class _ClassType; 2903 typedef _Rp _ReturnType; 2904}; 2905 2906template <class _MP> 2907struct __member_pointer_traits 2908 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 2909 is_member_function_pointer<_MP>::value, 2910 is_member_object_pointer<_MP>::value> 2911{ 2912// typedef ... _ClassType; 2913// typedef ... _ReturnType; 2914// typedef ... _FnType; 2915}; 2916 2917 2918template <class _DecayedFp> 2919struct __member_pointer_class_type {}; 2920 2921template <class _Ret, class _ClassType> 2922struct __member_pointer_class_type<_Ret _ClassType::*> { 2923 typedef _ClassType type; 2924}; 2925 2926// template <class T, class... Args> struct is_constructible; 2927 2928template <class _Tp, class ..._Args> 2929struct _LIBCPP_TEMPLATE_VIS is_constructible 2930 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 2931{ }; 2932 2933#if _LIBCPP_STD_VER > 14 2934template <class _Tp, class ..._Args> 2935inline constexpr bool is_constructible_v = is_constructible<_Tp, _Args...>::value; 2936#endif 2937 2938// is_default_constructible 2939 2940template <class _Tp> 2941struct _LIBCPP_TEMPLATE_VIS is_default_constructible 2942 : public is_constructible<_Tp> 2943 {}; 2944 2945#if _LIBCPP_STD_VER > 14 2946template <class _Tp> 2947inline constexpr bool is_default_constructible_v = is_default_constructible<_Tp>::value; 2948#endif 2949 2950#ifndef _LIBCPP_CXX03_LANG 2951// First of all, we can't implement this check in C++03 mode because the {} 2952// default initialization syntax isn't valid. 2953// Second, we implement the trait in a funny manner with two defaulted template 2954// arguments to workaround Clang's PR43454. 2955template <class _Tp> 2956void __test_implicit_default_constructible(_Tp); 2957 2958template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 2959struct __is_implicitly_default_constructible 2960 : false_type 2961{ }; 2962 2963template <class _Tp> 2964struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 2965 : true_type 2966{ }; 2967 2968template <class _Tp> 2969struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 2970 : false_type 2971{ }; 2972#endif // !C++03 2973 2974// is_copy_constructible 2975 2976template <class _Tp> 2977struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 2978 : public is_constructible<_Tp, 2979 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2980 2981#if _LIBCPP_STD_VER > 14 2982template <class _Tp> 2983inline constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value; 2984#endif 2985 2986// is_move_constructible 2987 2988template <class _Tp> 2989struct _LIBCPP_TEMPLATE_VIS is_move_constructible 2990 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2991 {}; 2992 2993#if _LIBCPP_STD_VER > 14 2994template <class _Tp> 2995inline constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value; 2996#endif 2997 2998// is_trivially_constructible 2999 3000template <class _Tp, class... _Args> 3001struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 3002 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 3003{ 3004}; 3005 3006#if _LIBCPP_STD_VER > 14 3007template <class _Tp, class... _Args> 3008inline constexpr bool is_trivially_constructible_v = is_trivially_constructible<_Tp, _Args...>::value; 3009#endif 3010 3011// is_trivially_default_constructible 3012 3013template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 3014 : public is_trivially_constructible<_Tp> 3015 {}; 3016 3017#if _LIBCPP_STD_VER > 14 3018template <class _Tp> 3019inline constexpr bool is_trivially_default_constructible_v = is_trivially_default_constructible<_Tp>::value; 3020#endif 3021 3022// is_trivially_copy_constructible 3023 3024template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 3025 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 3026 {}; 3027 3028#if _LIBCPP_STD_VER > 14 3029template <class _Tp> 3030inline constexpr bool is_trivially_copy_constructible_v = is_trivially_copy_constructible<_Tp>::value; 3031#endif 3032 3033// is_trivially_move_constructible 3034 3035template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 3036 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3037 {}; 3038 3039#if _LIBCPP_STD_VER > 14 3040template <class _Tp> 3041inline constexpr bool is_trivially_move_constructible_v = is_trivially_move_constructible<_Tp>::value; 3042#endif 3043 3044// is_trivially_assignable 3045 3046template <class _Tp, class _Arg> 3047struct is_trivially_assignable 3048 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 3049{ }; 3050 3051#if _LIBCPP_STD_VER > 14 3052template <class _Tp, class _Arg> 3053inline constexpr bool is_trivially_assignable_v = is_trivially_assignable<_Tp, _Arg>::value; 3054#endif 3055 3056// is_trivially_copy_assignable 3057 3058template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 3059 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3060 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3061 3062#if _LIBCPP_STD_VER > 14 3063template <class _Tp> 3064inline constexpr bool is_trivially_copy_assignable_v = is_trivially_copy_assignable<_Tp>::value; 3065#endif 3066 3067// is_trivially_move_assignable 3068 3069template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3070 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3071 typename add_rvalue_reference<_Tp>::type> 3072 {}; 3073 3074#if _LIBCPP_STD_VER > 14 3075template <class _Tp> 3076inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<_Tp>::value; 3077#endif 3078 3079// is_trivially_destructible 3080 3081#if __has_keyword(__is_trivially_destructible) 3082 3083template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3084 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3085 3086#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3087 3088template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3089 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3090 3091#else 3092 3093template <class _Tp> struct __libcpp_trivial_destructor 3094 : public integral_constant<bool, is_scalar<_Tp>::value || 3095 is_reference<_Tp>::value> {}; 3096 3097template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3098 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3099 3100template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3101 : public false_type {}; 3102 3103#endif 3104 3105#if _LIBCPP_STD_VER > 14 3106template <class _Tp> 3107inline constexpr bool is_trivially_destructible_v = is_trivially_destructible<_Tp>::value; 3108#endif 3109 3110// is_nothrow_constructible 3111 3112#if __has_keyword(__is_nothrow_constructible) 3113 3114template <class _Tp, class... _Args> 3115struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3116 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3117 3118#else 3119 3120template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3121 3122template <class _Tp, class... _Args> 3123struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3124 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3125{ 3126}; 3127 3128template <class _Tp> 3129void __implicit_conversion_to(_Tp) noexcept { } 3130 3131template <class _Tp, class _Arg> 3132struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3133 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3134{ 3135}; 3136 3137template <class _Tp, bool _IsReference, class... _Args> 3138struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3139 : public false_type 3140{ 3141}; 3142 3143template <class _Tp, class... _Args> 3144struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3145 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3146{ 3147}; 3148 3149template <class _Tp, size_t _Ns> 3150struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3151 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3152{ 3153}; 3154 3155#endif // _LIBCPP_HAS_NO_NOEXCEPT 3156 3157 3158#if _LIBCPP_STD_VER > 14 3159template <class _Tp, class ..._Args> 3160inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; 3161#endif 3162 3163// is_nothrow_default_constructible 3164 3165template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3166 : public is_nothrow_constructible<_Tp> 3167 {}; 3168 3169#if _LIBCPP_STD_VER > 14 3170template <class _Tp> 3171inline constexpr bool is_nothrow_default_constructible_v = is_nothrow_default_constructible<_Tp>::value; 3172#endif 3173 3174// is_nothrow_copy_constructible 3175 3176template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3177 : public is_nothrow_constructible<_Tp, 3178 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3179 3180#if _LIBCPP_STD_VER > 14 3181template <class _Tp> 3182inline constexpr bool is_nothrow_copy_constructible_v = is_nothrow_copy_constructible<_Tp>::value; 3183#endif 3184 3185// is_nothrow_move_constructible 3186 3187template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3188 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3189 {}; 3190 3191#if _LIBCPP_STD_VER > 14 3192template <class _Tp> 3193inline constexpr bool is_nothrow_move_constructible_v = is_nothrow_move_constructible<_Tp>::value; 3194#endif 3195 3196// is_nothrow_assignable 3197 3198#if __has_keyword(__is_nothrow_assignable) 3199 3200template <class _Tp, class _Arg> 3201struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3202 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3203 3204#else 3205 3206template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3207 3208template <class _Tp, class _Arg> 3209struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3210 : public false_type 3211{ 3212}; 3213 3214template <class _Tp, class _Arg> 3215struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3216 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Arg>()) > 3217{ 3218}; 3219 3220template <class _Tp, class _Arg> 3221struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3222 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3223{ 3224}; 3225 3226#endif // _LIBCPP_HAS_NO_NOEXCEPT 3227 3228#if _LIBCPP_STD_VER > 14 3229template <class _Tp, class _Arg> 3230inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<_Tp, _Arg>::value; 3231#endif 3232 3233// is_nothrow_copy_assignable 3234 3235template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3236 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3237 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3238 3239#if _LIBCPP_STD_VER > 14 3240template <class _Tp> 3241inline constexpr bool is_nothrow_copy_assignable_v = is_nothrow_copy_assignable<_Tp>::value; 3242#endif 3243 3244// is_nothrow_move_assignable 3245 3246template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 3247 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3248 typename add_rvalue_reference<_Tp>::type> 3249 {}; 3250 3251#if _LIBCPP_STD_VER > 14 3252template <class _Tp> 3253inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<_Tp>::value; 3254#endif 3255 3256// is_nothrow_destructible 3257 3258#if !defined(_LIBCPP_CXX03_LANG) 3259 3260template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3261 3262template <class _Tp> 3263struct __libcpp_is_nothrow_destructible<false, _Tp> 3264 : public false_type 3265{ 3266}; 3267 3268template <class _Tp> 3269struct __libcpp_is_nothrow_destructible<true, _Tp> 3270 : public integral_constant<bool, noexcept(declval<_Tp>().~_Tp()) > 3271{ 3272}; 3273 3274template <class _Tp> 3275struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3276 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3277{ 3278}; 3279 3280template <class _Tp, size_t _Ns> 3281struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3282 : public is_nothrow_destructible<_Tp> 3283{ 3284}; 3285 3286template <class _Tp> 3287struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3288 : public true_type 3289{ 3290}; 3291 3292template <class _Tp> 3293struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3294 : public true_type 3295{ 3296}; 3297 3298#else 3299 3300template <class _Tp> struct __libcpp_nothrow_destructor 3301 : public integral_constant<bool, is_scalar<_Tp>::value || 3302 is_reference<_Tp>::value> {}; 3303 3304template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3305 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3306 3307template <class _Tp> 3308struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3309 : public false_type {}; 3310 3311#endif 3312 3313#if _LIBCPP_STD_VER > 14 3314template <class _Tp> 3315inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value; 3316#endif 3317 3318// is_pod 3319 3320#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3321 3322template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3323 : public integral_constant<bool, __is_pod(_Tp)> {}; 3324 3325#else 3326 3327template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3328 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3329 is_trivially_copy_constructible<_Tp>::value && 3330 is_trivially_copy_assignable<_Tp>::value && 3331 is_trivially_destructible<_Tp>::value> {}; 3332 3333#endif 3334 3335#if _LIBCPP_STD_VER > 14 3336template <class _Tp> 3337inline constexpr bool is_pod_v = is_pod<_Tp>::value; 3338#endif 3339 3340// is_literal_type; 3341 3342#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3343template <class _Tp> struct _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 is_literal_type 3344 : public integral_constant<bool, __is_literal_type(_Tp)> 3345 {}; 3346 3347#if _LIBCPP_STD_VER > 14 3348template <class _Tp> 3349_LIBCPP_DEPRECATED_IN_CXX17 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value; 3350#endif // _LIBCPP_STD_VER > 14 3351#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3352 3353// is_standard_layout; 3354 3355template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3356#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3357 : public integral_constant<bool, __is_standard_layout(_Tp)> 3358#else 3359 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3360#endif 3361 {}; 3362 3363#if _LIBCPP_STD_VER > 14 3364template <class _Tp> 3365inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value; 3366#endif 3367 3368// is_trivially_copyable; 3369 3370template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3371 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3372 {}; 3373 3374#if _LIBCPP_STD_VER > 14 3375template <class _Tp> 3376inline constexpr bool is_trivially_copyable_v = is_trivially_copyable<_Tp>::value; 3377#endif 3378 3379// is_trivial; 3380 3381template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3382#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3383 : public integral_constant<bool, __is_trivial(_Tp)> 3384#else 3385 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3386 is_trivially_default_constructible<_Tp>::value> 3387#endif 3388 {}; 3389 3390#if _LIBCPP_STD_VER > 14 3391template <class _Tp> 3392inline constexpr bool is_trivial_v = is_trivial<_Tp>::value; 3393#endif 3394 3395template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3396template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3397template <class _Tp> struct __is_reference_wrapper 3398 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3399 3400#ifndef _LIBCPP_CXX03_LANG 3401 3402template <class _Fp, class _A0, 3403 class _DecayFp = typename decay<_Fp>::type, 3404 class _DecayA0 = typename decay<_A0>::type, 3405 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3406using __enable_if_bullet1 = typename enable_if 3407 < 3408 is_member_function_pointer<_DecayFp>::value 3409 && is_base_of<_ClassT, _DecayA0>::value 3410 >::type; 3411 3412template <class _Fp, class _A0, 3413 class _DecayFp = typename decay<_Fp>::type, 3414 class _DecayA0 = typename decay<_A0>::type> 3415using __enable_if_bullet2 = typename enable_if 3416 < 3417 is_member_function_pointer<_DecayFp>::value 3418 && __is_reference_wrapper<_DecayA0>::value 3419 >::type; 3420 3421template <class _Fp, class _A0, 3422 class _DecayFp = typename decay<_Fp>::type, 3423 class _DecayA0 = typename decay<_A0>::type, 3424 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3425using __enable_if_bullet3 = typename enable_if 3426 < 3427 is_member_function_pointer<_DecayFp>::value 3428 && !is_base_of<_ClassT, _DecayA0>::value 3429 && !__is_reference_wrapper<_DecayA0>::value 3430 >::type; 3431 3432template <class _Fp, class _A0, 3433 class _DecayFp = typename decay<_Fp>::type, 3434 class _DecayA0 = typename decay<_A0>::type, 3435 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3436using __enable_if_bullet4 = typename enable_if 3437 < 3438 is_member_object_pointer<_DecayFp>::value 3439 && is_base_of<_ClassT, _DecayA0>::value 3440 >::type; 3441 3442template <class _Fp, class _A0, 3443 class _DecayFp = typename decay<_Fp>::type, 3444 class _DecayA0 = typename decay<_A0>::type> 3445using __enable_if_bullet5 = typename enable_if 3446 < 3447 is_member_object_pointer<_DecayFp>::value 3448 && __is_reference_wrapper<_DecayA0>::value 3449 >::type; 3450 3451template <class _Fp, class _A0, 3452 class _DecayFp = typename decay<_Fp>::type, 3453 class _DecayA0 = typename decay<_A0>::type, 3454 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3455using __enable_if_bullet6 = typename enable_if 3456 < 3457 is_member_object_pointer<_DecayFp>::value 3458 && !is_base_of<_ClassT, _DecayA0>::value 3459 && !__is_reference_wrapper<_DecayA0>::value 3460 >::type; 3461 3462// __invoke forward declarations 3463 3464// fall back - none of the bullets 3465 3466template <class ..._Args> 3467auto __invoke(__any, _Args&& ...__args) -> __nat; 3468 3469template <class ..._Args> 3470auto __invoke_constexpr(__any, _Args&& ...__args) -> __nat; 3471 3472// bullets 1, 2 and 3 3473 3474template <class _Fp, class _A0, class ..._Args, 3475 class = __enable_if_bullet1<_Fp, _A0>> 3476inline _LIBCPP_INLINE_VISIBILITY 3477_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3478__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3479 noexcept(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...))) 3480 -> decltype( (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)) 3481 { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); } 3482 3483template <class _Fp, class _A0, class ..._Args, 3484 class = __enable_if_bullet1<_Fp, _A0>> 3485inline _LIBCPP_INLINE_VISIBILITY 3486_LIBCPP_CONSTEXPR auto 3487__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3488 noexcept(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...))) 3489 -> decltype( (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)) 3490 { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); } 3491 3492template <class _Fp, class _A0, class ..._Args, 3493 class = __enable_if_bullet2<_Fp, _A0>> 3494inline _LIBCPP_INLINE_VISIBILITY 3495_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3496__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3497 noexcept(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...))) 3498 -> decltype( (__a0.get().*__f)(static_cast<_Args&&>(__args)...)) 3499 { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); } 3500 3501template <class _Fp, class _A0, class ..._Args, 3502 class = __enable_if_bullet2<_Fp, _A0>> 3503inline _LIBCPP_INLINE_VISIBILITY 3504_LIBCPP_CONSTEXPR auto 3505__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3506 noexcept(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...))) 3507 -> decltype( (__a0.get().*__f)(static_cast<_Args&&>(__args)...)) 3508 { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); } 3509 3510template <class _Fp, class _A0, class ..._Args, 3511 class = __enable_if_bullet3<_Fp, _A0>> 3512inline _LIBCPP_INLINE_VISIBILITY 3513_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3514__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3515 noexcept(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...))) 3516 -> decltype( ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)) 3517 { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); } 3518 3519template <class _Fp, class _A0, class ..._Args, 3520 class = __enable_if_bullet3<_Fp, _A0>> 3521inline _LIBCPP_INLINE_VISIBILITY 3522_LIBCPP_CONSTEXPR auto 3523__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3524 noexcept(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...))) 3525 -> decltype( ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)) 3526 { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); } 3527 3528// bullets 4, 5 and 6 3529 3530template <class _Fp, class _A0, 3531 class = __enable_if_bullet4<_Fp, _A0>> 3532inline _LIBCPP_INLINE_VISIBILITY 3533_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3534__invoke(_Fp&& __f, _A0&& __a0) 3535 noexcept(noexcept(static_cast<_A0&&>(__a0).*__f)) 3536 -> decltype( static_cast<_A0&&>(__a0).*__f) 3537 { return static_cast<_A0&&>(__a0).*__f; } 3538 3539template <class _Fp, class _A0, 3540 class = __enable_if_bullet4<_Fp, _A0>> 3541inline _LIBCPP_INLINE_VISIBILITY 3542_LIBCPP_CONSTEXPR auto 3543__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3544 noexcept(noexcept(static_cast<_A0&&>(__a0).*__f)) 3545 -> decltype( static_cast<_A0&&>(__a0).*__f) 3546 { return static_cast<_A0&&>(__a0).*__f; } 3547 3548template <class _Fp, class _A0, 3549 class = __enable_if_bullet5<_Fp, _A0>> 3550inline _LIBCPP_INLINE_VISIBILITY 3551_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3552__invoke(_Fp&& __f, _A0&& __a0) 3553 noexcept(noexcept(__a0.get().*__f)) 3554 -> decltype( __a0.get().*__f) 3555 { return __a0.get().*__f; } 3556 3557template <class _Fp, class _A0, 3558 class = __enable_if_bullet5<_Fp, _A0>> 3559inline _LIBCPP_INLINE_VISIBILITY 3560_LIBCPP_CONSTEXPR auto 3561__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3562 noexcept(noexcept(__a0.get().*__f)) 3563 -> decltype( __a0.get().*__f) 3564 { return __a0.get().*__f; } 3565 3566template <class _Fp, class _A0, 3567 class = __enable_if_bullet6<_Fp, _A0>> 3568inline _LIBCPP_INLINE_VISIBILITY 3569_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3570__invoke(_Fp&& __f, _A0&& __a0) 3571 noexcept(noexcept((*static_cast<_A0&&>(__a0)).*__f)) 3572 -> decltype( (*static_cast<_A0&&>(__a0)).*__f) 3573 { return (*static_cast<_A0&&>(__a0)).*__f; } 3574 3575template <class _Fp, class _A0, 3576 class = __enable_if_bullet6<_Fp, _A0>> 3577inline _LIBCPP_INLINE_VISIBILITY 3578_LIBCPP_CONSTEXPR auto 3579__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3580 noexcept(noexcept((*static_cast<_A0&&>(__a0)).*__f)) 3581 -> decltype( (*static_cast<_A0&&>(__a0)).*__f) 3582 { return (*static_cast<_A0&&>(__a0)).*__f; } 3583 3584// bullet 7 3585 3586template <class _Fp, class ..._Args> 3587inline _LIBCPP_INLINE_VISIBILITY 3588_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3589__invoke(_Fp&& __f, _Args&& ...__args) 3590 noexcept(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...))) 3591 -> decltype( static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)) 3592 { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); } 3593 3594template <class _Fp, class ..._Args> 3595inline _LIBCPP_INLINE_VISIBILITY 3596_LIBCPP_CONSTEXPR auto 3597__invoke_constexpr(_Fp&& __f, _Args&& ...__args) 3598 noexcept(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...))) 3599 -> decltype( static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)) 3600 { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); } 3601 3602// __invokable 3603template <class _Ret, class _Fp, class ..._Args> 3604struct __invokable_r 3605{ 3606 template <class _XFp, class ..._XArgs> 3607 static auto __try_call(int) -> decltype( 3608 _VSTD::__invoke(declval<_XFp>(), declval<_XArgs>()...)); 3609 template <class _XFp, class ..._XArgs> 3610 static __nat __try_call(...); 3611 3612 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3613 // or incomplete array types as required by the standard. 3614 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3615 3616 using type = 3617 typename conditional< 3618 _IsNotSame<_Result, __nat>::value, 3619 typename conditional< 3620 is_void<_Ret>::value, 3621 true_type, 3622 is_convertible<_Result, _Ret> 3623 >::type, 3624 false_type 3625 >::type; 3626 static const bool value = type::value; 3627}; 3628template <class _Fp, class ..._Args> 3629using __invokable = __invokable_r<void, _Fp, _Args...>; 3630 3631template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3632struct __nothrow_invokable_r_imp { 3633 static const bool value = false; 3634}; 3635 3636template <class _Ret, class _Fp, class ..._Args> 3637struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3638{ 3639 typedef __nothrow_invokable_r_imp _ThisT; 3640 3641 template <class _Tp> 3642 static void __test_noexcept(_Tp) noexcept; 3643 3644 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3645 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...))); 3646}; 3647 3648template <class _Ret, class _Fp, class ..._Args> 3649struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3650{ 3651 static const bool value = noexcept( 3652 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...)); 3653}; 3654 3655template <class _Ret, class _Fp, class ..._Args> 3656using __nothrow_invokable_r = 3657 __nothrow_invokable_r_imp< 3658 __invokable_r<_Ret, _Fp, _Args...>::value, 3659 is_void<_Ret>::value, 3660 _Ret, _Fp, _Args... 3661 >; 3662 3663template <class _Fp, class ..._Args> 3664using __nothrow_invokable = 3665 __nothrow_invokable_r_imp< 3666 __invokable<_Fp, _Args...>::value, 3667 true, void, _Fp, _Args... 3668 >; 3669 3670template <class _Fp, class ..._Args> 3671struct __invoke_of 3672 : public enable_if< 3673 __invokable<_Fp, _Args...>::value, 3674 typename __invokable_r<void, _Fp, _Args...>::_Result> 3675{ 3676}; 3677 3678#endif // _LIBCPP_CXX03_LANG 3679 3680// result_of 3681 3682#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3683template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 3684 3685#ifndef _LIBCPP_CXX03_LANG 3686 3687template <class _Fp, class ..._Args> 3688class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 3689 : public __invoke_of<_Fp, _Args...> 3690{ 3691}; 3692 3693#else // C++03 3694 3695template <class _Fn, bool, bool> 3696class __result_of 3697{ 3698}; 3699 3700template <class _Fn, class ..._Args> 3701class __result_of<_Fn(_Args...), true, false> 3702{ 3703public: 3704 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 3705}; 3706 3707template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 3708struct __result_of_mp; 3709 3710// member function pointer 3711 3712template <class _MP, class _Tp> 3713struct __result_of_mp<_MP, _Tp, true> 3714{ 3715 using type = typename __member_pointer_traits<_MP>::_ReturnType; 3716}; 3717 3718// member data pointer 3719 3720template <class _MP, class _Tp, bool> 3721struct __result_of_mdp; 3722 3723template <class _Rp, class _Class, class _Tp> 3724struct __result_of_mdp<_Rp _Class::*, _Tp, false> 3725{ 3726 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 3727}; 3728 3729template <class _Rp, class _Class, class _Tp> 3730struct __result_of_mdp<_Rp _Class::*, _Tp, true> 3731{ 3732 using type = typename __apply_cv<_Tp, _Rp>::type&; 3733}; 3734 3735template <class _Rp, class _Class, class _Tp> 3736struct __result_of_mp<_Rp _Class::*, _Tp, false> 3737 : public __result_of_mdp<_Rp _Class::*, _Tp, 3738 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 3739{ 3740}; 3741 3742template <class _Fn, class _Tp> 3743class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 3744 : public __result_of_mp<typename remove_reference<_Fn>::type, 3745 _Tp, 3746 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 3747{ 3748}; 3749 3750template <class _Fn, class _Tp, class ..._Args> 3751class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 3752 : public __result_of_mp<typename remove_reference<_Fn>::type, 3753 _Tp, 3754 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 3755{ 3756}; 3757 3758template <class _Fn, class ..._Args> 3759class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 3760 : public __result_of<_Fn(_Args...), 3761 is_class<typename remove_reference<_Fn>::type>::value || 3762 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 3763 is_member_pointer<typename remove_reference<_Fn>::type>::value 3764 > 3765{ 3766}; 3767 3768#endif // C++03 3769 3770#if _LIBCPP_STD_VER > 11 3771template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 3772#endif // _LIBCPP_STD_VER > 11 3773#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3774 3775#if _LIBCPP_STD_VER > 14 3776 3777// invoke_result 3778 3779template <class _Fn, class... _Args> 3780struct _LIBCPP_TEMPLATE_VIS invoke_result 3781 : __invoke_of<_Fn, _Args...> 3782{ 3783}; 3784 3785template <class _Fn, class... _Args> 3786using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 3787 3788// is_invocable 3789 3790template <class _Fn, class ..._Args> 3791struct _LIBCPP_TEMPLATE_VIS is_invocable 3792 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 3793 3794template <class _Ret, class _Fn, class ..._Args> 3795struct _LIBCPP_TEMPLATE_VIS is_invocable_r 3796 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 3797 3798template <class _Fn, class ..._Args> 3799inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; 3800 3801template <class _Ret, class _Fn, class ..._Args> 3802inline constexpr bool is_invocable_r_v = is_invocable_r<_Ret, _Fn, _Args...>::value; 3803 3804// is_nothrow_invocable 3805 3806template <class _Fn, class ..._Args> 3807struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 3808 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 3809 3810template <class _Ret, class _Fn, class ..._Args> 3811struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 3812 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 3813 3814template <class _Fn, class ..._Args> 3815inline constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<_Fn, _Args...>::value; 3816 3817template <class _Ret, class _Fn, class ..._Args> 3818inline constexpr bool is_nothrow_invocable_r_v = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 3819 3820#endif // _LIBCPP_STD_VER > 14 3821 3822// __swappable 3823 3824template <class _Tp> struct __is_swappable; 3825template <class _Tp> struct __is_nothrow_swappable; 3826 3827 3828#ifndef _LIBCPP_CXX03_LANG 3829template <class _Tp> 3830using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 3831#else 3832template <class> 3833using __swap_result_t = void; 3834#endif 3835 3836template <class _Tp> 3837inline _LIBCPP_INLINE_VISIBILITY 3838_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 3839swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 3840 is_nothrow_move_assignable<_Tp>::value); 3841 3842template<class _Tp, size_t _Np> 3843inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3844typename enable_if< 3845 __is_swappable<_Tp>::value 3846>::type 3847swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 3848 3849namespace __detail 3850{ 3851// ALL generic swap overloads MUST already have a declaration available at this point. 3852 3853template <class _Tp, class _Up = _Tp, 3854 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 3855struct __swappable_with 3856{ 3857 template <class _LHS, class _RHS> 3858 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 3859 __test_swap(int); 3860 template <class, class> 3861 static __nat __test_swap(long); 3862 3863 // Extra parens are needed for the C++03 definition of decltype. 3864 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 3865 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 3866 3867 static const bool value = _IsNotSame<__swap1, __nat>::value 3868 && _IsNotSame<__swap2, __nat>::value; 3869}; 3870 3871template <class _Tp, class _Up> 3872struct __swappable_with<_Tp, _Up, false> : false_type {}; 3873 3874template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 3875struct __nothrow_swappable_with { 3876 static const bool value = 3877#ifndef _LIBCPP_HAS_NO_NOEXCEPT 3878 noexcept(swap(declval<_Tp>(), declval<_Up>())) 3879 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 3880#else 3881 false; 3882#endif 3883}; 3884 3885template <class _Tp, class _Up> 3886struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 3887 3888} // namespace __detail 3889 3890template <class _Tp> 3891struct __is_swappable 3892 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 3893{ 3894}; 3895 3896template <class _Tp> 3897struct __is_nothrow_swappable 3898 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 3899{ 3900}; 3901 3902#if _LIBCPP_STD_VER > 14 3903 3904template <class _Tp, class _Up> 3905struct _LIBCPP_TEMPLATE_VIS is_swappable_with 3906 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 3907{ 3908}; 3909 3910template <class _Tp> 3911struct _LIBCPP_TEMPLATE_VIS is_swappable 3912 : public conditional< 3913 __is_referenceable<_Tp>::value, 3914 is_swappable_with< 3915 typename add_lvalue_reference<_Tp>::type, 3916 typename add_lvalue_reference<_Tp>::type>, 3917 false_type 3918 >::type 3919{ 3920}; 3921 3922template <class _Tp, class _Up> 3923struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 3924 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 3925{ 3926}; 3927 3928template <class _Tp> 3929struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 3930 : public conditional< 3931 __is_referenceable<_Tp>::value, 3932 is_nothrow_swappable_with< 3933 typename add_lvalue_reference<_Tp>::type, 3934 typename add_lvalue_reference<_Tp>::type>, 3935 false_type 3936 >::type 3937{ 3938}; 3939 3940template <class _Tp, class _Up> 3941inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 3942 3943template <class _Tp> 3944inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 3945 3946template <class _Tp, class _Up> 3947inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 3948 3949template <class _Tp> 3950inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 3951 3952#endif // _LIBCPP_STD_VER > 14 3953 3954template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 3955 3956template <class _Tp> 3957struct __underlying_type_impl<_Tp, false> {}; 3958 3959template <class _Tp> 3960struct __underlying_type_impl<_Tp, true> 3961{ 3962 typedef __underlying_type(_Tp) type; 3963}; 3964 3965template <class _Tp> 3966struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 3967 3968#if _LIBCPP_STD_VER > 11 3969template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 3970#endif 3971 3972template <class _Tp, bool = is_enum<_Tp>::value> 3973struct __sfinae_underlying_type 3974{ 3975 typedef typename underlying_type<_Tp>::type type; 3976 typedef decltype(((type)1) + 0) __promoted_type; 3977}; 3978 3979template <class _Tp> 3980struct __sfinae_underlying_type<_Tp, false> {}; 3981 3982inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3983int __convert_to_integral(int __val) { return __val; } 3984 3985inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3986unsigned __convert_to_integral(unsigned __val) { return __val; } 3987 3988inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3989long __convert_to_integral(long __val) { return __val; } 3990 3991inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3992unsigned long __convert_to_integral(unsigned long __val) { return __val; } 3993 3994inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3995long long __convert_to_integral(long long __val) { return __val; } 3996 3997inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3998unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 3999 4000template<typename _Fp> 4001inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4002typename enable_if<is_floating_point<_Fp>::value, long long>::type 4003 __convert_to_integral(_Fp __val) { return __val; } 4004 4005#ifndef _LIBCPP_HAS_NO_INT128 4006inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4007__int128_t __convert_to_integral(__int128_t __val) { return __val; } 4008 4009inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4010__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 4011#endif 4012 4013template <class _Tp> 4014inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4015typename __sfinae_underlying_type<_Tp>::__promoted_type 4016__convert_to_integral(_Tp __val) { return __val; } 4017 4018// is_scoped_enum [meta.unary.prop] 4019 4020#if _LIBCPP_STD_VER > 20 4021template <class _Tp, bool = is_enum_v<_Tp> > 4022struct __is_scoped_enum_helper : false_type {}; 4023 4024template <class _Tp> 4025struct __is_scoped_enum_helper<_Tp, true> 4026 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 4027 4028template <class _Tp> 4029struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 4030 : public __is_scoped_enum_helper<_Tp> {}; 4031 4032template <class _Tp> 4033inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; 4034#endif 4035 4036#if _LIBCPP_STD_VER > 14 4037 4038template <class... _Args> 4039struct conjunction : _And<_Args...> {}; 4040template<class... _Args> 4041inline constexpr bool conjunction_v = conjunction<_Args...>::value; 4042 4043template <class... _Args> 4044struct disjunction : _Or<_Args...> {}; 4045template<class... _Args> 4046inline constexpr bool disjunction_v = disjunction<_Args...>::value; 4047 4048template <class _Tp> 4049struct negation : _Not<_Tp> {}; 4050template<class _Tp> 4051inline constexpr bool negation_v = negation<_Tp>::value; 4052#endif // _LIBCPP_STD_VER > 14 4053 4054// These traits are used in __tree and __hash_table 4055struct __extract_key_fail_tag {}; 4056struct __extract_key_self_tag {}; 4057struct __extract_key_first_tag {}; 4058 4059template <class _ValTy, class _Key, 4060 class _RawValTy = typename __unconstref<_ValTy>::type> 4061struct __can_extract_key 4062 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 4063 __extract_key_fail_tag>::type {}; 4064 4065template <class _Pair, class _Key, class _First, class _Second> 4066struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 4067 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 4068 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 4069 4070// __can_extract_map_key uses true_type/false_type instead of the tags. 4071// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 4072// and _ValTy == _Key. 4073template <class _ValTy, class _Key, class _ContainerValueTy, 4074 class _RawValTy = typename __unconstref<_ValTy>::type> 4075struct __can_extract_map_key 4076 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 4077 4078// This specialization returns __extract_key_fail_tag for non-map containers 4079// because _Key == _ContainerValueTy 4080template <class _ValTy, class _Key, class _RawValTy> 4081struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 4082 : false_type {}; 4083 4084#if _LIBCPP_STD_VER > 17 4085_LIBCPP_INLINE_VISIBILITY 4086inline constexpr bool is_constant_evaluated() noexcept { 4087 return __builtin_is_constant_evaluated(); 4088} 4089#endif 4090 4091inline _LIBCPP_CONSTEXPR 4092bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 4093 4094template <class _CharT> 4095using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 4096 4097template<class _Tp> 4098using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 4099 4100#if _LIBCPP_STD_VER > 17 4101template<bool _Const, class _Tp> 4102using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 4103#endif // _LIBCPP_STD_VER > 17 4104 4105_LIBCPP_END_NAMESPACE_STD 4106 4107#endif // _LIBCPP_TYPE_TRAITS 4108