1// -*- C++ -*- 2//===------------------------ type_traits ---------------------------------===// 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; 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 169 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; 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, std::size_t Align=default-alignment> 220 using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14 221 template <std::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++14 237 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++17 306 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 458typedef _LIBCPP_BOOL_CONSTANT(true) true_type; 459typedef _LIBCPP_BOOL_CONSTANT(false) false_type; 460 461template <bool _Val> 462using _BoolConstant _LIBCPP_NODEBUG_TYPE = integral_constant<bool, _Val>; 463 464template <bool> struct _MetaBase; 465template <> 466struct _MetaBase<true> { 467 template <class _Tp, class _Up> 468 using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Tp; 469 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 470 using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _FirstFn<_Args...>; 471 template <class _First, class...> 472 using _FirstImpl _LIBCPP_NODEBUG_TYPE = _First; 473 template <class, class _Second, class...> 474 using _SecondImpl _LIBCPP_NODEBUG_TYPE = _Second; 475 template <class _Tp = void> 476 using _EnableIfImpl _LIBCPP_NODEBUG_TYPE = _Tp; 477 template <class _Result, class _First, class ..._Rest> 478 using _OrImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 479 template <class _Result, class _First, class ..._Rest> 480 using _AndImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value == true && sizeof...(_Rest) != 0>::template _AndImpl<_First, _Rest...>; 481}; 482 483template <> 484struct _MetaBase<false> { 485 template <class _Tp, class _Up> 486 using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Up; 487 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 488 using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _SecondFn<_Args...>; 489 template <class _Result, class ...> 490 using _OrImpl _LIBCPP_NODEBUG_TYPE = _Result; 491 template <class _Result, class ...> 492 using _AndImpl _LIBCPP_NODEBUG_TYPE = _Result; 493}; 494template <bool _Cond, class _Ret = void> 495using _EnableIf _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>; 496template <bool _Cond, class _IfRes, class _ElseRes> 497using _If _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 498template <class ..._Rest> 499using _Or _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 500template <class ..._Rest> 501using _And _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _AndImpl<true_type, _Rest...>; 502template <class _Pred> 503struct _Not : _BoolConstant<!_Pred::value> {}; 504template <class ..._Args> 505using _FirstType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 506template <class ..._Args> 507using _SecondType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 508 509template <template <class...> class _Func, class ..._Args> 510struct _Lazy : _Func<_Args...> {}; 511 512// Member detector base 513 514template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 515true_type __sfinae_test_impl(int); 516template <template <class...> class, class ...> 517false_type __sfinae_test_impl(...); 518 519template <template <class ...> class _Templ, class ..._Args> 520using _IsValidExpansion _LIBCPP_NODEBUG_TYPE = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 521 522template <class> 523struct __void_t { typedef void type; }; 524 525template <class _Tp> 526struct __identity { typedef _Tp type; }; 527 528template <class _Tp> 529using __identity_t _LIBCPP_NODEBUG_TYPE = typename __identity<_Tp>::type; 530 531template <class _Tp, bool> 532struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 533 534 535template <bool _Bp, class _If, class _Then> 536 struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;}; 537template <class _If, class _Then> 538 struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;}; 539 540#if _LIBCPP_STD_VER > 11 541template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type; 542#endif 543 544template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {}; 545template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;}; 546 547#if _LIBCPP_STD_VER > 11 548template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; 549#endif 550 551// is_same 552 553#if __has_keyword(__is_same) 554 555template <class _Tp, class _Up> 556struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { }; 557 558#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 559template <class _Tp, class _Up> 560_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v = __is_same(_Tp, _Up); 561#endif 562 563#else 564 565template <class _Tp, class _Up> struct _LIBCPP_TEMPLATE_VIS is_same : public false_type {}; 566template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {}; 567 568#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 569template <class _Tp, class _Up> 570_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v 571 = is_same<_Tp, _Up>::value; 572#endif 573 574#endif // __is_same 575 576template <class _Tp, class _Up> 577using _IsSame = _BoolConstant< 578#ifdef __clang__ 579 __is_same(_Tp, _Up) 580#else 581 _VSTD::is_same<_Tp, _Up>::value 582#endif 583>; 584 585template <class _Tp, class _Up> 586using _IsNotSame = _BoolConstant< 587#ifdef __clang__ 588 !__is_same(_Tp, _Up) 589#else 590 !_VSTD::is_same<_Tp, _Up>::value 591#endif 592>; 593 594 595template <class _Tp> 596using __test_for_primary_template = _EnableIf< 597 _IsSame<_Tp, typename _Tp::__primary_template>::value 598 >; 599template <class _Tp> 600using __is_primary_template = _IsValidExpansion< 601 __test_for_primary_template, _Tp 602 >; 603 604struct __two {char __lx[2];}; 605 606// helper class: 607 608// is_const 609 610#if __has_keyword(__is_const) 611 612template <class _Tp> 613struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { }; 614 615#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 616template <class _Tp> 617_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v = __is_const(_Tp); 618#endif 619 620#else 621 622template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 623template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 624 625#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 626template <class _Tp> 627_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v 628 = is_const<_Tp>::value; 629#endif 630 631#endif // __has_keyword(__is_const) 632 633// is_volatile 634 635#if __has_keyword(__is_volatile) 636 637template <class _Tp> 638struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { }; 639 640#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 641template <class _Tp> 642_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v = __is_volatile(_Tp); 643#endif 644 645#else 646 647template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {}; 648template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {}; 649 650#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 651template <class _Tp> 652_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v 653 = is_volatile<_Tp>::value; 654#endif 655 656#endif // __has_keyword(__is_volatile) 657 658// remove_const 659 660#if __has_keyword(__remove_const) 661 662template <class _Tp> 663struct _LIBCPP_TEMPLATE_VIS remove_const {typedef __remove_const(_Tp) type;}; 664 665#if _LIBCPP_STD_VER > 11 666template <class _Tp> using remove_const_t = __remove_const(_Tp); 667#endif 668 669#else 670 671template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const {typedef _Tp type;}; 672template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;}; 673#if _LIBCPP_STD_VER > 11 674template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type; 675#endif 676 677#endif // __has_keyword(__remove_const) 678 679// remove_volatile 680 681#if __has_keyword(__remove_volatile) 682 683template <class _Tp> 684struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef __remove_volatile(_Tp) type;}; 685 686#if _LIBCPP_STD_VER > 11 687template <class _Tp> using remove_volatile_t = __remove_volatile(_Tp); 688#endif 689 690#else 691 692template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef _Tp type;}; 693template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;}; 694#if _LIBCPP_STD_VER > 11 695template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type; 696#endif 697 698#endif // __has_keyword(__remove_volatile) 699 700// remove_cv 701 702#if __has_keyword(__remove_cv) 703 704template <class _Tp> 705struct _LIBCPP_TEMPLATE_VIS remove_cv {typedef __remove_cv(_Tp) type;}; 706 707#if _LIBCPP_STD_VER > 11 708template <class _Tp> using remove_cv_t = __remove_cv(_Tp); 709#endif 710 711#else 712 713template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv 714{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 715#if _LIBCPP_STD_VER > 11 716template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type; 717#endif 718 719#endif // __has_keyword(__remove_cv) 720 721// is_void 722 723#if __has_keyword(__is_void) 724 725template <class _Tp> 726struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { }; 727 728#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 729template <class _Tp> 730_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v = __is_void(_Tp); 731#endif 732 733#else 734 735template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void 736 : public is_same<typename remove_cv<_Tp>::type, void> {}; 737 738#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 739template <class _Tp> 740_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v 741 = is_void<_Tp>::value; 742#endif 743 744#endif // __has_keyword(__is_void) 745 746// __is_nullptr_t 747 748template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 749template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 750 751template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 752 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 753 754#if _LIBCPP_STD_VER > 11 755template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 756 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 757 758#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 759template <class _Tp> 760_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_null_pointer_v 761 = is_null_pointer<_Tp>::value; 762#endif 763#endif // _LIBCPP_STD_VER > 11 764 765// is_integral 766 767#if __has_keyword(__is_integral) 768 769template <class _Tp> 770struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { }; 771 772#if _LIBCPP_STD_VER > 14 773template <class _Tp> 774_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v = __is_integral(_Tp); 775#endif 776 777#else 778 779template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral 780 : public _BoolConstant<__libcpp_is_integral<typename remove_cv<_Tp>::type>::value> {}; 781 782#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 783template <class _Tp> 784_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v 785 = is_integral<_Tp>::value; 786#endif 787 788#endif // __has_keyword(__is_integral) 789 790// is_floating_point 791 792template <class _Tp> struct __libcpp_is_floating_point : public false_type {}; 793template <> struct __libcpp_is_floating_point<float> : public true_type {}; 794template <> struct __libcpp_is_floating_point<double> : public true_type {}; 795template <> struct __libcpp_is_floating_point<long double> : public true_type {}; 796 797template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point 798 : public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {}; 799 800#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 801template <class _Tp> 802_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_floating_point_v 803 = is_floating_point<_Tp>::value; 804#endif 805 806// is_array 807 808#if __has_keyword(__is_array) 809 810template <class _Tp> 811struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { }; 812 813#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 814template <class _Tp> 815_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v = __is_array(_Tp); 816#endif 817 818#else 819 820template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array 821 : public false_type {}; 822template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]> 823 : public true_type {}; 824template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]> 825 : public true_type {}; 826 827#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 828template <class _Tp> 829_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v 830 = is_array<_Tp>::value; 831#endif 832 833#endif // __has_keyword(__is_array) 834 835// is_pointer 836 837// Before Clang 11, __is_pointer didn't work for Objective-C types. 838#if __has_keyword(__is_pointer) && !(defined(_LIBCPP_COMPILER_CLANG) && _LIBCPP_CLANG_VER < 1100) 839 840template<class _Tp> 841struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { }; 842 843#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 844template <class _Tp> 845_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v = __is_pointer(_Tp); 846#endif 847 848#else // __has_keyword(__is_pointer) 849 850template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 851template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 852 853template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 854#if defined(_LIBCPP_HAS_OBJC_ARC) 855template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 856template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 857template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 858template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 859#endif 860 861template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 862 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 863 864#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 865template <class _Tp> 866_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v 867 = is_pointer<_Tp>::value; 868#endif 869 870#endif // __has_keyword(__is_pointer) 871 872// is_reference 873 874#if __has_keyword(__is_lvalue_reference) && \ 875 __has_keyword(__is_rvalue_reference) && \ 876 __has_keyword(__is_reference) 877 878template<class _Tp> 879struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { }; 880 881template<class _Tp> 882struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { }; 883 884template<class _Tp> 885struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { }; 886 887#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 888template <class _Tp> 889_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v = __is_reference(_Tp); 890 891template <class _Tp> 892_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); 893 894template <class _Tp> 895_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v = __is_rvalue_reference(_Tp); 896#endif 897 898#else // __has_keyword(__is_lvalue_reference) && etc... 899 900template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 901template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 902 903template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 904template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 905 906template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 907template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 908template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {}; 909 910#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 911template <class _Tp> 912_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v 913 = is_reference<_Tp>::value; 914 915template <class _Tp> 916_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v 917 = is_lvalue_reference<_Tp>::value; 918 919template <class _Tp> 920_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v 921 = is_rvalue_reference<_Tp>::value; 922#endif 923 924#endif // __has_keyword(__is_lvalue_reference) && etc... 925 926// is_union 927 928#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 929 930template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 931 : public integral_constant<bool, __is_union(_Tp)> {}; 932 933#else 934 935template <class _Tp> struct __libcpp_union : public false_type {}; 936template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 937 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 938 939#endif 940 941#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 942template <class _Tp> 943_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_union_v 944 = is_union<_Tp>::value; 945#endif 946 947// is_class 948 949#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 950 951template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 952 : public integral_constant<bool, __is_class(_Tp)> {}; 953 954#else 955 956namespace __is_class_imp 957{ 958template <class _Tp> char __test(int _Tp::*); 959template <class _Tp> __two __test(...); 960} 961 962template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 963 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 964 965#endif 966 967#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 968template <class _Tp> 969_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_class_v 970 = is_class<_Tp>::value; 971#endif 972 973// is_function 974 975template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 976 : public _BoolConstant< 977#ifdef __clang__ 978 __is_function(_Tp) 979#else 980 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 981#endif 982 > {}; 983 984 985#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 986template <class _Tp> 987_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_function_v 988 = is_function<_Tp>::value; 989#endif 990 991template <class _Tp> struct __libcpp_is_member_pointer { 992 enum { 993 __is_member = false, 994 __is_func = false, 995 __is_obj = false 996 }; 997}; 998template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 999 enum { 1000 __is_member = true, 1001 __is_func = is_function<_Tp>::value, 1002 __is_obj = !__is_func, 1003 }; 1004}; 1005 1006#if __has_keyword(__is_member_function_pointer) 1007 1008template<class _Tp> 1009struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 1010 : _BoolConstant<__is_member_function_pointer(_Tp)> { }; 1011 1012#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1013template <class _Tp> 1014_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 1015 = __is_member_function_pointer(_Tp); 1016#endif 1017 1018#else // __has_keyword(__is_member_function_pointer) 1019 1020template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 1021 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 1022 1023#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1024template <class _Tp> 1025_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 1026 = is_member_function_pointer<_Tp>::value; 1027#endif 1028 1029#endif // __has_keyword(__is_member_function_pointer) 1030 1031// is_member_pointer 1032 1033#if __has_keyword(__is_member_pointer) 1034 1035template<class _Tp> 1036struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { }; 1037 1038#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1039template <class _Tp> 1040_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v = __is_member_pointer(_Tp); 1041#endif 1042 1043#else // __has_keyword(__is_member_pointer) 1044 1045template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 1046 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 1047 1048#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1049template <class _Tp> 1050_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v 1051 = is_member_pointer<_Tp>::value; 1052#endif 1053 1054#endif // __has_keyword(__is_member_pointer) 1055 1056// is_member_object_pointer 1057 1058#if __has_keyword(__is_member_object_pointer) 1059 1060template<class _Tp> 1061struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1062 : _BoolConstant<__is_member_object_pointer(_Tp)> { }; 1063 1064#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1065template <class _Tp> 1066_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 1067 = __is_member_object_pointer(_Tp); 1068#endif 1069 1070#else // __has_keyword(__is_member_object_pointer) 1071 1072template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1073 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 1074 1075#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1076template <class _Tp> 1077_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 1078 = is_member_object_pointer<_Tp>::value; 1079#endif 1080 1081#endif // __has_keyword(__is_member_object_pointer) 1082 1083// is_enum 1084 1085#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1086 1087template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1088 : public integral_constant<bool, __is_enum(_Tp)> {}; 1089 1090#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1091template <class _Tp> 1092_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v = __is_enum(_Tp); 1093#endif 1094 1095#else 1096 1097template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1098 : public integral_constant<bool, !is_void<_Tp>::value && 1099 !is_integral<_Tp>::value && 1100 !is_floating_point<_Tp>::value && 1101 !is_array<_Tp>::value && 1102 !is_pointer<_Tp>::value && 1103 !is_reference<_Tp>::value && 1104 !is_member_pointer<_Tp>::value && 1105 !is_union<_Tp>::value && 1106 !is_class<_Tp>::value && 1107 !is_function<_Tp>::value > {}; 1108 1109#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1110template <class _Tp> 1111_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v 1112 = is_enum<_Tp>::value; 1113#endif 1114 1115#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1116 1117// is_arithmetic 1118 1119 1120template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 1121 : public integral_constant<bool, is_integral<_Tp>::value || 1122 is_floating_point<_Tp>::value> {}; 1123 1124#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1125template <class _Tp> 1126_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v 1127 = is_arithmetic<_Tp>::value; 1128#endif 1129 1130// is_fundamental 1131 1132// Before Clang 10, __is_fundamental didn't work for nullptr_t. 1133// In C++03 nullptr_t is library-provided but must still count as "fundamental." 1134#if __has_keyword(__is_fundamental) && !(defined(_LIBCPP_COMPILER_CLANG) && _LIBCPP_CLANG_VER < 1000) && !defined(_LIBCPP_CXX03_LANG) 1135 1136template<class _Tp> 1137struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { }; 1138 1139#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1140template <class _Tp> 1141_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v = __is_fundamental(_Tp); 1142#endif 1143 1144#else // __has_keyword(__is_fundamental) 1145 1146template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 1147 : public integral_constant<bool, is_void<_Tp>::value || 1148 __is_nullptr_t<_Tp>::value || 1149 is_arithmetic<_Tp>::value> {}; 1150 1151#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1152template <class _Tp> 1153_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v 1154 = is_fundamental<_Tp>::value; 1155#endif 1156 1157#endif // __has_keyword(__is_fundamental) 1158 1159// is_scalar 1160 1161// In C++03 nullptr_t is library-provided but must still count as "scalar." 1162#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG) 1163 1164template<class _Tp> 1165struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { }; 1166 1167#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1168template <class _Tp> 1169_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v = __is_scalar(_Tp); 1170#endif 1171 1172#else // __has_keyword(__is_scalar) 1173 1174template <class _Tp> struct __is_block : false_type {}; 1175#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) 1176template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {}; 1177#endif 1178 1179template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1180 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1181 is_member_pointer<_Tp>::value || 1182 is_pointer<_Tp>::value || 1183 __is_nullptr_t<_Tp>::value || 1184 __is_block<_Tp>::value || 1185 is_enum<_Tp>::value > {}; 1186 1187template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1188 1189#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1190template <class _Tp> 1191_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v 1192 = is_scalar<_Tp>::value; 1193#endif 1194 1195#endif // __has_keyword(__is_scalar) 1196 1197// is_object 1198 1199#if __has_keyword(__is_object) 1200 1201template<class _Tp> 1202struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { }; 1203 1204#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1205template <class _Tp> 1206_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v = __is_object(_Tp); 1207#endif 1208 1209#else // __has_keyword(__is_object) 1210 1211template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1212 : public integral_constant<bool, is_scalar<_Tp>::value || 1213 is_array<_Tp>::value || 1214 is_union<_Tp>::value || 1215 is_class<_Tp>::value > {}; 1216 1217#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1218template <class _Tp> 1219_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v 1220 = is_object<_Tp>::value; 1221#endif 1222 1223#endif // __has_keyword(__is_object) 1224 1225// is_compound 1226 1227// >= 11 because in C++03 nullptr isn't actually nullptr 1228#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG) 1229 1230template<class _Tp> 1231struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { }; 1232 1233#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1234template <class _Tp> 1235_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v = __is_compound(_Tp); 1236#endif 1237 1238#else // __has_keyword(__is_compound) 1239 1240template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1241 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1242 1243#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1244template <class _Tp> 1245_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v 1246 = is_compound<_Tp>::value; 1247#endif 1248 1249#endif // __has_keyword(__is_compound) 1250 1251// __is_referenceable [defns.referenceable] 1252 1253struct __is_referenceable_impl { 1254 template <class _Tp> static _Tp& __test(int); 1255 template <class _Tp> static __two __test(...); 1256}; 1257 1258template <class _Tp> 1259struct __is_referenceable : integral_constant<bool, 1260 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1261 1262 1263// add_const 1264 1265template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1266 typedef _LIBCPP_NODEBUG_TYPE const _Tp type; 1267}; 1268 1269#if _LIBCPP_STD_VER > 11 1270template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1271#endif 1272 1273// add_volatile 1274 1275template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1276 typedef _LIBCPP_NODEBUG_TYPE volatile _Tp type; 1277}; 1278 1279#if _LIBCPP_STD_VER > 11 1280template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1281#endif 1282 1283// add_cv 1284template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1285 typedef _LIBCPP_NODEBUG_TYPE const volatile _Tp type; 1286}; 1287 1288#if _LIBCPP_STD_VER > 11 1289template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1290#endif 1291 1292// remove_reference 1293 1294#if __has_keyword(__remove_reference) 1295 1296template<class _Tp> 1297struct _LIBCPP_TEMPLATE_VIS remove_reference { typedef __remove_reference(_Tp) type; }; 1298 1299#else // __has_keyword(__remove_reference) 1300 1301template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1302template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1303template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1304 1305#if _LIBCPP_STD_VER > 11 1306template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1307#endif 1308 1309#endif // __has_keyword(__remove_reference) 1310 1311// add_lvalue_reference 1312 1313template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1314template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; }; 1315 1316template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1317{typedef _LIBCPP_NODEBUG_TYPE typename __add_lvalue_reference_impl<_Tp>::type type;}; 1318 1319#if _LIBCPP_STD_VER > 11 1320template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1321#endif 1322 1323template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1324template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp&& type; }; 1325 1326template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1327{typedef _LIBCPP_NODEBUG_TYPE typename __add_rvalue_reference_impl<_Tp>::type type;}; 1328 1329#if _LIBCPP_STD_VER > 11 1330template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1331#endif 1332 1333// Suppress deprecation notice for volatile-qualified return type resulting 1334// from volatile-qualified types _Tp. 1335_LIBCPP_SUPPRESS_DEPRECATED_PUSH 1336template <class _Tp> _Tp&& __declval(int); 1337template <class _Tp> _Tp __declval(long); 1338_LIBCPP_SUPPRESS_DEPRECATED_POP 1339 1340template <class _Tp> 1341decltype(_VSTD::__declval<_Tp>(0)) 1342declval() _NOEXCEPT; 1343 1344// __uncvref 1345 1346template <class _Tp> 1347struct __uncvref { 1348 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<typename remove_reference<_Tp>::type>::type type; 1349}; 1350 1351template <class _Tp> 1352struct __unconstref { 1353 typedef _LIBCPP_NODEBUG_TYPE typename remove_const<typename remove_reference<_Tp>::type>::type type; 1354}; 1355 1356#ifndef _LIBCPP_CXX03_LANG 1357template <class _Tp> 1358using __uncvref_t _LIBCPP_NODEBUG_TYPE = typename __uncvref<_Tp>::type; 1359#endif 1360 1361// __is_same_uncvref 1362 1363template <class _Tp, class _Up> 1364struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type, 1365 typename __uncvref<_Up>::type> {}; 1366 1367#if _LIBCPP_STD_VER > 17 1368// remove_cvref - same as __uncvref 1369template <class _Tp> 1370struct remove_cvref : public __uncvref<_Tp> {}; 1371 1372template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1373#endif 1374 1375 1376struct __any 1377{ 1378 __any(...); 1379}; 1380 1381// remove_pointer 1382 1383template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1384template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1385template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1386template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1387template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1388 1389#if _LIBCPP_STD_VER > 11 1390template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1391#endif 1392 1393// add_pointer 1394 1395template <class _Tp, 1396 bool = __is_referenceable<_Tp>::value || 1397 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1398struct __add_pointer_impl 1399 {typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type* type;}; 1400template <class _Tp> struct __add_pointer_impl<_Tp, false> 1401 {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1402 1403template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1404 {typedef _LIBCPP_NODEBUG_TYPE typename __add_pointer_impl<_Tp>::type type;}; 1405 1406#if _LIBCPP_STD_VER > 11 1407template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1408#endif 1409 1410// type_identity 1411#if _LIBCPP_STD_VER > 17 1412template<class _Tp> struct type_identity { typedef _Tp type; }; 1413template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1414#endif 1415 1416// is_signed 1417 1418// Before Clang 10, __is_signed didn't work for floating-point types or enums. 1419#if __has_keyword(__is_signed) && !(defined(_LIBCPP_COMPILER_CLANG) && _LIBCPP_CLANG_VER < 1000) 1420 1421template<class _Tp> 1422struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { }; 1423 1424#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1425template <class _Tp> 1426_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v = __is_signed(_Tp); 1427#endif 1428 1429#else // __has_keyword(__is_signed) 1430 1431template <class _Tp, bool = is_integral<_Tp>::value> 1432struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {}; 1433 1434template <class _Tp> 1435struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1436 1437template <class _Tp, bool = is_arithmetic<_Tp>::value> 1438struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1439 1440template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1441 1442template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1443 1444#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1445template <class _Tp> 1446_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v 1447 = is_signed<_Tp>::value; 1448#endif 1449 1450#endif // __has_keyword(__is_signed) 1451 1452// is_unsigned 1453 1454// Before Clang 13, __is_unsigned returned true for enums with signed underlying type. 1455#if __has_keyword(__is_unsigned) && !(defined(_LIBCPP_COMPILER_CLANG) && _LIBCPP_CLANG_VER < 1300) 1456 1457template<class _Tp> 1458struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { }; 1459 1460#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1461template <class _Tp> 1462_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v = __is_unsigned(_Tp); 1463#endif 1464 1465#else // __has_keyword(__is_unsigned) 1466 1467template <class _Tp, bool = is_integral<_Tp>::value> 1468struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {}; 1469 1470template <class _Tp> 1471struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1472 1473template <class _Tp, bool = is_arithmetic<_Tp>::value> 1474struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1475 1476template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1477 1478template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {}; 1479 1480#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1481template <class _Tp> 1482_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v 1483 = is_unsigned<_Tp>::value; 1484#endif 1485 1486#endif // __has_keyword(__is_unsigned) 1487 1488// rank 1489 1490template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1491 : public integral_constant<size_t, 0> {}; 1492template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1493 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1494template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1495 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1496 1497#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1498template <class _Tp> 1499_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t rank_v 1500 = rank<_Tp>::value; 1501#endif 1502 1503// extent 1504 1505#if __has_keyword(__array_extent) 1506 1507template<class _Tp, size_t _Dim = 0> 1508struct _LIBCPP_TEMPLATE_VIS extent 1509 : integral_constant<size_t, __array_extent(_Tp, _Dim)> { }; 1510 1511#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1512template <class _Tp, unsigned _Ip = 0> 1513_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v = __array_extent(_Tp, _Ip); 1514#endif 1515 1516#else // __has_keyword(__array_extent) 1517 1518template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1519 : public integral_constant<size_t, 0> {}; 1520template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1521 : public integral_constant<size_t, 0> {}; 1522template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1523 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1524template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1525 : public integral_constant<size_t, _Np> {}; 1526template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1527 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1528 1529#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1530template <class _Tp, unsigned _Ip = 0> 1531_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v 1532 = extent<_Tp, _Ip>::value; 1533#endif 1534 1535#endif // __has_keyword(__array_extent) 1536 1537// remove_extent 1538 1539template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1540 {typedef _Tp type;}; 1541template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1542 {typedef _Tp type;}; 1543template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1544 {typedef _Tp type;}; 1545 1546#if _LIBCPP_STD_VER > 11 1547template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1548#endif 1549 1550// remove_all_extents 1551 1552template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1553 {typedef _Tp type;}; 1554template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1555 {typedef typename remove_all_extents<_Tp>::type type;}; 1556template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1557 {typedef typename remove_all_extents<_Tp>::type type;}; 1558 1559#if _LIBCPP_STD_VER > 11 1560template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1561#endif 1562 1563#if _LIBCPP_STD_VER > 17 1564// is_bounded_array 1565 1566template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1567template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1568 1569template <class _Tp> 1570_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1571bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1572 1573// is_unbounded_array 1574 1575template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1576template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1577 1578template <class _Tp> 1579_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1580bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1581#endif 1582 1583// decay 1584 1585template <class _Up, bool> 1586struct __decay { 1587 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<_Up>::type type; 1588}; 1589 1590template <class _Up> 1591struct __decay<_Up, true> { 1592public: 1593 typedef _LIBCPP_NODEBUG_TYPE typename conditional 1594 < 1595 is_array<_Up>::value, 1596 typename remove_extent<_Up>::type*, 1597 typename conditional 1598 < 1599 is_function<_Up>::value, 1600 typename add_pointer<_Up>::type, 1601 typename remove_cv<_Up>::type 1602 >::type 1603 >::type type; 1604}; 1605 1606template <class _Tp> 1607struct _LIBCPP_TEMPLATE_VIS decay 1608{ 1609private: 1610 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 1611public: 1612 typedef _LIBCPP_NODEBUG_TYPE typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1613}; 1614 1615#if _LIBCPP_STD_VER > 11 1616template <class _Tp> using decay_t = typename decay<_Tp>::type; 1617#endif 1618 1619// is_abstract 1620 1621template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1622 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1623 1624#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1625template <class _Tp> 1626_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_abstract_v 1627 = is_abstract<_Tp>::value; 1628#endif 1629 1630// is_final 1631 1632template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1633__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1634 1635#if _LIBCPP_STD_VER > 11 1636template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1637is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1638#endif 1639 1640#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1641template <class _Tp> 1642_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_final_v 1643 = is_final<_Tp>::value; 1644#endif 1645 1646// is_aggregate 1647#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1648 1649template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1650is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1651 1652#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1653template <class _Tp> 1654_LIBCPP_INLINE_VAR constexpr bool is_aggregate_v 1655 = is_aggregate<_Tp>::value; 1656#endif 1657 1658#endif // _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1659 1660// is_base_of 1661 1662template <class _Bp, class _Dp> 1663struct _LIBCPP_TEMPLATE_VIS is_base_of 1664 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1665 1666#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1667template <class _Bp, class _Dp> 1668_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_base_of_v 1669 = is_base_of<_Bp, _Dp>::value; 1670#endif 1671 1672// __is_core_convertible 1673 1674// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed. 1675// We can't test for that, but we can test implicit convertibility by passing it 1676// to a function. Notice that __is_core_convertible<void,void> is false, 1677// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later. 1678 1679template <class _Tp, class _Up, class = void> 1680struct __is_core_convertible : public false_type {}; 1681 1682template <class _Tp, class _Up> 1683struct __is_core_convertible<_Tp, _Up, decltype( 1684 static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() ) 1685)> : public true_type {}; 1686 1687// is_convertible 1688 1689#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1690 1691template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1692 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 1693 1694#else // __has_feature(is_convertible_to) 1695 1696namespace __is_convertible_imp 1697{ 1698template <class _Tp> void __test_convert(_Tp); 1699 1700template <class _From, class _To, class = void> 1701struct __is_convertible_test : public false_type {}; 1702 1703template <class _From, class _To> 1704struct __is_convertible_test<_From, _To, 1705 decltype(_VSTD::__is_convertible_imp::__test_convert<_To>(_VSTD::declval<_From>()))> : public true_type 1706{}; 1707 1708template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1709 bool _IsFunction = is_function<_Tp>::value, 1710 bool _IsVoid = is_void<_Tp>::value> 1711 struct __is_array_function_or_void {enum {value = 0};}; 1712template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1713template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1714template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1715} 1716 1717template <class _Tp, 1718 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1719struct __is_convertible_check 1720{ 1721 static const size_t __v = 0; 1722}; 1723 1724template <class _Tp> 1725struct __is_convertible_check<_Tp, 0> 1726{ 1727 static const size_t __v = sizeof(_Tp); 1728}; 1729 1730template <class _T1, class _T2, 1731 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1732 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1733struct __is_convertible 1734 : public integral_constant<bool, 1735 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1736 > 1737{}; 1738 1739template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1740template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1741template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1742template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1743 1744template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1745template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1746template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1747template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1748 1749template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1750template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1751template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1752template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1753 1754template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1755 : public __is_convertible<_T1, _T2> 1756{ 1757 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1758 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1759}; 1760 1761#endif // __has_feature(is_convertible_to) 1762 1763#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1764template <class _From, class _To> 1765_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_convertible_v 1766 = is_convertible<_From, _To>::value; 1767#endif 1768 1769// is_nothrow_convertible 1770 1771#if _LIBCPP_STD_VER > 17 1772 1773template <typename _Tp> 1774static void __test_noexcept(_Tp) noexcept; 1775 1776template<typename _Fm, typename _To> 1777static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 1778__is_nothrow_convertible_test(); 1779 1780template <typename _Fm, typename _To> 1781struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1782{ }; 1783 1784template <typename _Fm, typename _To> 1785struct is_nothrow_convertible : _Or< 1786 _And<is_void<_To>, is_void<_Fm>>, 1787 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1788>::type { }; 1789 1790template <typename _Fm, typename _To> 1791inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1792 1793#endif // _LIBCPP_STD_VER > 17 1794 1795// is_empty 1796 1797#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1798 1799template <class _Tp> 1800struct _LIBCPP_TEMPLATE_VIS is_empty 1801 : public integral_constant<bool, __is_empty(_Tp)> {}; 1802 1803#else // __has_feature(is_empty) 1804 1805template <class _Tp> 1806struct __is_empty1 1807 : public _Tp 1808{ 1809 double __lx; 1810}; 1811 1812struct __is_empty2 1813{ 1814 double __lx; 1815}; 1816 1817template <class _Tp, bool = is_class<_Tp>::value> 1818struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1819 1820template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1821 1822template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1823 1824#endif // __has_feature(is_empty) 1825 1826#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1827template <class _Tp> 1828_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_empty_v 1829 = is_empty<_Tp>::value; 1830#endif 1831 1832// is_polymorphic 1833 1834#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1835 1836template <class _Tp> 1837struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1838 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1839 1840#else 1841 1842template<typename _Tp> char &__is_polymorphic_impl( 1843 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1844 int>::type); 1845template<typename _Tp> __two &__is_polymorphic_impl(...); 1846 1847template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1848 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1849 1850#endif // __has_feature(is_polymorphic) 1851 1852#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1853template <class _Tp> 1854_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_polymorphic_v 1855 = is_polymorphic<_Tp>::value; 1856#endif 1857 1858// has_virtual_destructor 1859 1860#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1861 1862template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1863 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1864 1865#else 1866 1867template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1868 : public false_type {}; 1869 1870#endif 1871 1872#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1873template <class _Tp> 1874_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_virtual_destructor_v 1875 = has_virtual_destructor<_Tp>::value; 1876#endif 1877 1878// has_unique_object_representations 1879 1880#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS) 1881 1882template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1883 : public integral_constant<bool, 1884 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1885 1886#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1887template <class _Tp> 1888_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_unique_object_representations_v 1889 = has_unique_object_representations<_Tp>::value; 1890#endif 1891 1892#endif 1893 1894// alignment_of 1895 1896template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1897 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1898 1899#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1900template <class _Tp> 1901_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t alignment_of_v 1902 = alignment_of<_Tp>::value; 1903#endif 1904 1905// aligned_storage 1906 1907template <class _Hp, class _Tp> 1908struct __type_list 1909{ 1910 typedef _Hp _Head; 1911 typedef _Tp _Tail; 1912}; 1913 1914struct __nat 1915{ 1916#ifndef _LIBCPP_CXX03_LANG 1917 __nat() = delete; 1918 __nat(const __nat&) = delete; 1919 __nat& operator=(const __nat&) = delete; 1920 ~__nat() = delete; 1921#endif 1922}; 1923 1924template <class _Tp> 1925struct __align_type 1926{ 1927 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1928 typedef _Tp type; 1929}; 1930 1931struct __struct_double {long double __lx;}; 1932struct __struct_double4 {double __lx[4];}; 1933 1934typedef 1935 __type_list<__align_type<unsigned char>, 1936 __type_list<__align_type<unsigned short>, 1937 __type_list<__align_type<unsigned int>, 1938 __type_list<__align_type<unsigned long>, 1939 __type_list<__align_type<unsigned long long>, 1940 __type_list<__align_type<double>, 1941 __type_list<__align_type<long double>, 1942 __type_list<__align_type<__struct_double>, 1943 __type_list<__align_type<__struct_double4>, 1944 __type_list<__align_type<int*>, 1945 __nat 1946 > > > > > > > > > > __all_types; 1947 1948template <size_t _Align> 1949struct _ALIGNAS(_Align) __fallback_overaligned {}; 1950 1951template <class _TL, size_t _Align> struct __find_pod; 1952 1953template <class _Hp, size_t _Align> 1954struct __find_pod<__type_list<_Hp, __nat>, _Align> 1955{ 1956 typedef typename conditional< 1957 _Align == _Hp::value, 1958 typename _Hp::type, 1959 __fallback_overaligned<_Align> 1960 >::type type; 1961}; 1962 1963template <class _Hp, class _Tp, size_t _Align> 1964struct __find_pod<__type_list<_Hp, _Tp>, _Align> 1965{ 1966 typedef typename conditional< 1967 _Align == _Hp::value, 1968 typename _Hp::type, 1969 typename __find_pod<_Tp, _Align>::type 1970 >::type type; 1971}; 1972 1973template <class _TL, size_t _Len> struct __find_max_align; 1974 1975template <class _Hp, size_t _Len> 1976struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 1977 1978template <size_t _Len, size_t _A1, size_t _A2> 1979struct __select_align 1980{ 1981private: 1982 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 1983 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 1984public: 1985 static const size_t value = _Len < __max ? __min : __max; 1986}; 1987 1988template <class _Hp, class _Tp, size_t _Len> 1989struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 1990 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 1991 1992template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1993struct _LIBCPP_TEMPLATE_VIS aligned_storage 1994{ 1995 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 1996 union type 1997 { 1998 _Aligner __align; 1999 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 2000 }; 2001}; 2002 2003#if _LIBCPP_STD_VER > 11 2004template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 2005 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 2006#endif 2007 2008#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 2009template <size_t _Len>\ 2010struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 2011{\ 2012 struct _ALIGNAS(n) type\ 2013 {\ 2014 unsigned char __lx[(_Len + n - 1)/n * n];\ 2015 };\ 2016} 2017 2018_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 2019_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 2020_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 2021_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 2022_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 2023_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 2024_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 2025_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 2026_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 2027_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 2028_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 2029_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 2030_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 2031_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 2032// PE/COFF does not support alignment beyond 8192 (=0x2000) 2033#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 2034_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 2035#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 2036 2037#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 2038 2039 2040// aligned_union 2041 2042template <size_t _I0, size_t ..._In> 2043struct __static_max; 2044 2045template <size_t _I0> 2046struct __static_max<_I0> 2047{ 2048 static const size_t value = _I0; 2049}; 2050 2051template <size_t _I0, size_t _I1, size_t ..._In> 2052struct __static_max<_I0, _I1, _In...> 2053{ 2054 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 2055 __static_max<_I1, _In...>::value; 2056}; 2057 2058template <size_t _Len, class _Type0, class ..._Types> 2059struct aligned_union 2060{ 2061 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 2062 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 2063 static const size_t __len = __static_max<_Len, sizeof(_Type0), 2064 sizeof(_Types)...>::value; 2065 typedef typename aligned_storage<__len, alignment_value>::type type; 2066}; 2067 2068#if _LIBCPP_STD_VER > 11 2069template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 2070#endif 2071 2072template <class _Tp> 2073struct __numeric_type 2074{ 2075 static void __test(...); 2076 static float __test(float); 2077 static double __test(char); 2078 static double __test(int); 2079 static double __test(unsigned); 2080 static double __test(long); 2081 static double __test(unsigned long); 2082 static double __test(long long); 2083 static double __test(unsigned long long); 2084 static double __test(double); 2085 static long double __test(long double); 2086 2087 typedef decltype(__test(declval<_Tp>())) type; 2088 static const bool value = _IsNotSame<type, void>::value; 2089}; 2090 2091template <> 2092struct __numeric_type<void> 2093{ 2094 static const bool value = true; 2095}; 2096 2097// __promote 2098 2099template <class _A1, class _A2 = void, class _A3 = void, 2100 bool = __numeric_type<_A1>::value && 2101 __numeric_type<_A2>::value && 2102 __numeric_type<_A3>::value> 2103class __promote_imp 2104{ 2105public: 2106 static const bool value = false; 2107}; 2108 2109template <class _A1, class _A2, class _A3> 2110class __promote_imp<_A1, _A2, _A3, true> 2111{ 2112private: 2113 typedef typename __promote_imp<_A1>::type __type1; 2114 typedef typename __promote_imp<_A2>::type __type2; 2115 typedef typename __promote_imp<_A3>::type __type3; 2116public: 2117 typedef decltype(__type1() + __type2() + __type3()) type; 2118 static const bool value = true; 2119}; 2120 2121template <class _A1, class _A2> 2122class __promote_imp<_A1, _A2, void, true> 2123{ 2124private: 2125 typedef typename __promote_imp<_A1>::type __type1; 2126 typedef typename __promote_imp<_A2>::type __type2; 2127public: 2128 typedef decltype(__type1() + __type2()) type; 2129 static const bool value = true; 2130}; 2131 2132template <class _A1> 2133class __promote_imp<_A1, void, void, true> 2134{ 2135public: 2136 typedef typename __numeric_type<_A1>::type type; 2137 static const bool value = true; 2138}; 2139 2140template <class _A1, class _A2 = void, class _A3 = void> 2141class __promote : public __promote_imp<_A1, _A2, _A3> {}; 2142 2143// make_signed / make_unsigned 2144 2145typedef 2146 __type_list<signed char, 2147 __type_list<signed short, 2148 __type_list<signed int, 2149 __type_list<signed long, 2150 __type_list<signed long long, 2151#ifndef _LIBCPP_HAS_NO_INT128 2152 __type_list<__int128_t, 2153#endif 2154 __nat 2155#ifndef _LIBCPP_HAS_NO_INT128 2156 > 2157#endif 2158 > > > > > __signed_types; 2159 2160typedef 2161 __type_list<unsigned char, 2162 __type_list<unsigned short, 2163 __type_list<unsigned int, 2164 __type_list<unsigned long, 2165 __type_list<unsigned long long, 2166#ifndef _LIBCPP_HAS_NO_INT128 2167 __type_list<__uint128_t, 2168#endif 2169 __nat 2170#ifndef _LIBCPP_HAS_NO_INT128 2171 > 2172#endif 2173 > > > > > __unsigned_types; 2174 2175template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 2176 2177template <class _Hp, class _Tp, size_t _Size> 2178struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 2179{ 2180 typedef _LIBCPP_NODEBUG_TYPE _Hp type; 2181}; 2182 2183template <class _Hp, class _Tp, size_t _Size> 2184struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 2185{ 2186 typedef _LIBCPP_NODEBUG_TYPE typename __find_first<_Tp, _Size>::type type; 2187}; 2188 2189template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 2190 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 2191struct __apply_cv 2192{ 2193 typedef _LIBCPP_NODEBUG_TYPE _Up type; 2194}; 2195 2196template <class _Tp, class _Up> 2197struct __apply_cv<_Tp, _Up, true, false> 2198{ 2199 typedef _LIBCPP_NODEBUG_TYPE const _Up type; 2200}; 2201 2202template <class _Tp, class _Up> 2203struct __apply_cv<_Tp, _Up, false, true> 2204{ 2205 typedef volatile _Up type; 2206}; 2207 2208template <class _Tp, class _Up> 2209struct __apply_cv<_Tp, _Up, true, true> 2210{ 2211 typedef const volatile _Up type; 2212}; 2213 2214template <class _Tp, class _Up> 2215struct __apply_cv<_Tp&, _Up, false, false> 2216{ 2217 typedef _Up& type; 2218}; 2219 2220template <class _Tp, class _Up> 2221struct __apply_cv<_Tp&, _Up, true, false> 2222{ 2223 typedef const _Up& type; 2224}; 2225 2226template <class _Tp, class _Up> 2227struct __apply_cv<_Tp&, _Up, false, true> 2228{ 2229 typedef volatile _Up& type; 2230}; 2231 2232template <class _Tp, class _Up> 2233struct __apply_cv<_Tp&, _Up, true, true> 2234{ 2235 typedef const volatile _Up& type; 2236}; 2237 2238template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2239struct __make_signed {}; 2240 2241template <class _Tp> 2242struct __make_signed<_Tp, true> 2243{ 2244 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 2245}; 2246 2247template <> struct __make_signed<bool, true> {}; 2248template <> struct __make_signed< signed short, true> {typedef short type;}; 2249template <> struct __make_signed<unsigned short, true> {typedef short type;}; 2250template <> struct __make_signed< signed int, true> {typedef int type;}; 2251template <> struct __make_signed<unsigned int, true> {typedef int type;}; 2252template <> struct __make_signed< signed long, true> {typedef long type;}; 2253template <> struct __make_signed<unsigned long, true> {typedef long type;}; 2254template <> struct __make_signed< signed long long, true> {typedef long long type;}; 2255template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 2256#ifndef _LIBCPP_HAS_NO_INT128 2257template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 2258template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 2259#endif 2260 2261template <class _Tp> 2262struct _LIBCPP_TEMPLATE_VIS make_signed 2263{ 2264 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 2265}; 2266 2267#if _LIBCPP_STD_VER > 11 2268template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 2269#endif 2270 2271template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2272struct __make_unsigned {}; 2273 2274template <class _Tp> 2275struct __make_unsigned<_Tp, true> 2276{ 2277 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2278}; 2279 2280template <> struct __make_unsigned<bool, true> {}; 2281template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2282template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2283template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2284template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2285template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2286template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2287template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2288template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2289#ifndef _LIBCPP_HAS_NO_INT128 2290template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2291template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2292#endif 2293 2294template <class _Tp> 2295struct _LIBCPP_TEMPLATE_VIS make_unsigned 2296{ 2297 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2298}; 2299 2300#if _LIBCPP_STD_VER > 11 2301template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2302#endif 2303 2304#if _LIBCPP_STD_VER > 14 2305template <class...> using void_t = void; 2306#endif 2307 2308#if _LIBCPP_STD_VER > 17 2309// Let COND_RES(X, Y) be: 2310template <class _Tp, class _Up> 2311using __cond_type = decltype(false ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>()); 2312 2313template <class _Tp, class _Up, class = void> 2314struct __common_type3 {}; 2315 2316// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 2317template <class _Tp, class _Up> 2318struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 2319{ 2320 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 2321}; 2322 2323template <class _Tp, class _Up, class = void> 2324struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 2325#else 2326template <class _Tp, class _Up, class = void> 2327struct __common_type2_imp {}; 2328#endif 2329 2330// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 2331template <class _Tp, class _Up> 2332struct __common_type2_imp<_Tp, _Up, 2333 typename __void_t<decltype( 2334 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2335 )>::type> 2336{ 2337 typedef _LIBCPP_NODEBUG_TYPE typename decay<decltype( 2338 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2339 )>::type type; 2340}; 2341 2342template <class, class = void> 2343struct __common_type_impl {}; 2344 2345// Clang provides variadic templates in C++03 as an extension. 2346#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2347# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2348template <class... Tp> 2349struct __common_types; 2350template <class... _Tp> 2351struct _LIBCPP_TEMPLATE_VIS common_type; 2352#else 2353# define _LIBCPP_OPTIONAL_PACK(...) 2354struct __no_arg; 2355template <class _Tp, class _Up, class = __no_arg> 2356struct __common_types; 2357template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2358 class _Unused = __no_arg> 2359struct common_type { 2360 static_assert(sizeof(_Unused) == 0, 2361 "common_type accepts at most 3 arguments in C++03"); 2362}; 2363#endif // _LIBCPP_CXX03_LANG 2364 2365template <class _Tp, class _Up> 2366struct __common_type_impl< 2367 __common_types<_Tp, _Up>, 2368 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2369{ 2370 typedef typename common_type<_Tp, _Up>::type type; 2371}; 2372 2373template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2374struct __common_type_impl< 2375 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2376 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2377 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2378 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2379}; 2380 2381// bullet 1 - sizeof...(Tp) == 0 2382 2383template <> 2384struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2385 2386// bullet 2 - sizeof...(Tp) == 1 2387 2388template <class _Tp> 2389struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2390 : public common_type<_Tp, _Tp> {}; 2391 2392// bullet 3 - sizeof...(Tp) == 2 2393 2394// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 2395template <class _Tp, class _Up> 2396struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2397 : conditional< 2398 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2399 __common_type2_imp<_Tp, _Up>, 2400 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2401 >::type 2402{}; 2403 2404// bullet 4 - sizeof...(Tp) > 2 2405 2406template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2407struct _LIBCPP_TEMPLATE_VIS 2408 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2409 : __common_type_impl< 2410 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2411 2412#undef _LIBCPP_OPTIONAL_PACK 2413 2414#if _LIBCPP_STD_VER > 11 2415template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2416#endif 2417 2418#if _LIBCPP_STD_VER > 11 2419// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM’s 2420// top-level cv-qualifiers. 2421template <class _From, class _To> 2422struct __copy_cv 2423{ 2424 using type = _To; 2425}; 2426 2427template <class _From, class _To> 2428struct __copy_cv<const _From, _To> 2429{ 2430 using type = add_const_t<_To>; 2431}; 2432 2433template <class _From, class _To> 2434struct __copy_cv<volatile _From, _To> 2435{ 2436 using type = add_volatile_t<_To>; 2437}; 2438 2439template <class _From, class _To> 2440struct __copy_cv<const volatile _From, _To> 2441{ 2442 using type = add_cv_t<_To>; 2443}; 2444 2445template <class _From, class _To> 2446using __copy_cv_t = typename __copy_cv<_From, _To>::type; 2447 2448template <class _From, class _To> 2449struct __copy_cvref 2450{ 2451 using type = __copy_cv_t<_From, _To>; 2452}; 2453 2454template <class _From, class _To> 2455struct __copy_cvref<_From&, _To> 2456{ 2457 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 2458}; 2459 2460template <class _From, class _To> 2461struct __copy_cvref<_From&&, _To> 2462{ 2463 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 2464}; 2465 2466template <class _From, class _To> 2467using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 2468 2469#endif // _LIBCPP_STD_VER > 11 2470 2471// common_reference 2472#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 2473// Let COND_RES(X, Y) be: 2474template <class _Xp, class _Yp> 2475using __cond_res = 2476 decltype(false ? _VSTD::declval<_Xp(&)()>()() : _VSTD::declval<_Yp(&)()>()()); 2477 2478// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 2479// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 2480// `U`. 2481// [Note: `XREF(A)` is `__xref<A>::template __apply`] 2482template <class _Tp> 2483struct __xref { 2484 template<class _Up> 2485 using __apply = __copy_cvref_t<_Tp, _Up>; 2486}; 2487 2488// Given types `A` and `B`, let `X` be `remove_reference_t<A>`, let `Y` be `remove_reference_t<B>`, 2489// and let `COMMON-REF(A, B)` be: 2490template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 2491struct __common_ref; 2492 2493template<class _Xp, class _Yp> 2494using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 2495 2496template<class _Xp, class _Yp> 2497using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 2498 2499 2500// If `A` and `B` are both lvalue reference types, `COMMON-REF(A, B)` is 2501// `COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &)` if that type exists and is a reference type. 2502template<class _Ap, class _Bp, class _Xp, class _Yp> 2503requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 2504struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 2505{ 2506 using __type = __cv_cond_res<_Xp, _Yp>; 2507}; 2508 2509// Otherwise, let `C` be `remove_reference_t<COMMON-REF(X&, Y&)>&&`.... 2510template <class _Xp, class _Yp> 2511using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 2512 2513 2514// .... If `A` and `B` are both rvalue reference types, `C` is well-formed, and 2515// `is_convertible_v<A, C> && is_convertible_v<B, C>` is `true`, then `COMMON-REF(A, B)` is `C`. 2516template<class _Ap, class _Bp, class _Xp, class _Yp> 2517requires 2518 requires { typename __common_ref_C<_Xp, _Yp>; } && 2519 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 2520 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 2521struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 2522{ 2523 using __type = __common_ref_C<_Xp, _Yp>; 2524}; 2525 2526// Otherwise, let `D` be `COMMON-REF(const X&, Y&)`.... 2527template <class _Tp, class _Up> 2528using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 2529 2530// ... If `A` is an rvalue reference and `B` is an lvalue reference and `D` is well-formed and 2531// `is_convertible_v<A, D>` is `true`, then `COMMON-REF(A, B)` is `D`. 2532template<class _Ap, class _Bp, class _Xp, class _Yp> 2533requires requires { typename __common_ref_D<_Xp, _Yp>; } && 2534 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 2535struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 2536{ 2537 using __type = __common_ref_D<_Xp, _Yp>; 2538}; 2539 2540// Otherwise, if `A` is an lvalue reference and `B` is an rvalue reference, then 2541// `COMMON-REF(A, B)` is `COMMON-REF(B, A)`. 2542template<class _Ap, class _Bp, class _Xp, class _Yp> 2543struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 2544 2545// Otherwise, `COMMON-REF(A, B)` is ill-formed. 2546template<class _Ap, class _Bp, class _Xp, class _Yp> 2547struct __common_ref {}; 2548 2549// Note C: For the common_reference trait applied to a parameter pack [...] 2550 2551template <class...> 2552struct common_reference; 2553 2554template <class... _Types> 2555using common_reference_t = typename common_reference<_Types...>::type; 2556 2557// bullet 1 - sizeof...(T) == 0 2558template<> 2559struct common_reference<> {}; 2560 2561// bullet 2 - sizeof...(T) == 1 2562template <class _Tp> 2563struct common_reference<_Tp> 2564{ 2565 using type = _Tp; 2566}; 2567 2568// bullet 3 - sizeof...(T) == 2 2569template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 2570template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 2571template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 2572 2573// sub-bullet 1 - If `T1` and `T2` are reference types and `COMMON-REF(T1, T2)` is well-formed, then 2574// the member typedef type denotes that type. 2575template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 2576 2577template <class _Tp, class _Up> 2578requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 2579struct __common_reference_sub_bullet1<_Tp, _Up> 2580{ 2581 using type = __common_ref_t<_Tp, _Up>; 2582}; 2583 2584// sub-bullet 2 - Otherwise, if `basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type` 2585// is well-formed, then the member typedef type denotes that type. 2586template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 2587 2588template <class _Tp, class _Up> 2589using __basic_common_reference_t = typename basic_common_reference< 2590 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 2591 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 2592 2593template <class _Tp, class _Up> 2594requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 2595struct __common_reference_sub_bullet2<_Tp, _Up> 2596{ 2597 using type = __basic_common_reference_t<_Tp, _Up>; 2598}; 2599 2600// sub-bullet 3 - Otherwise, if `COND-RES(T1, T2)` is well-formed, then the member typedef type 2601// denotes that type. 2602template <class _Tp, class _Up> 2603requires requires { typename __cond_res<_Tp, _Up>; } 2604struct __common_reference_sub_bullet3<_Tp, _Up> 2605{ 2606 using type = __cond_res<_Tp, _Up>; 2607}; 2608 2609 2610// sub-bullet 4 & 5 - Otherwise, if `common_type_t<T1, T2>` is well-formed, then the member typedef 2611// type denotes that type. 2612// - Otherwise, there shall be no member type. 2613template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 2614 2615// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 2616// any, as `common_reference_t<C, Rest...>`. 2617template <class _Tp, class _Up, class _Vp, class... _Rest> 2618requires requires { typename common_reference_t<_Tp, _Up>; } 2619struct common_reference<_Tp, _Up, _Vp, _Rest...> 2620 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 2621{}; 2622 2623// bullet 5 - Otherwise, there shall be no member type. 2624template <class...> struct common_reference {}; 2625 2626#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 2627 2628// is_assignable 2629 2630template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 2631 2632#if __has_keyword(__is_assignable) 2633 2634template<class _Tp, class _Up> 2635struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { }; 2636 2637#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2638template <class _Tp, class _Arg> 2639_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v = __is_assignable(_Tp, _Arg); 2640#endif 2641 2642#else // __has_keyword(__is_assignable) 2643 2644template <class _Tp, class _Arg> 2645typename __select_2nd<decltype((_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>())), true_type>::type 2646__is_assignable_test(int); 2647 2648template <class, class> 2649false_type __is_assignable_test(...); 2650 2651 2652template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2653struct __is_assignable_imp 2654 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2655 2656template <class _Tp, class _Arg> 2657struct __is_assignable_imp<_Tp, _Arg, true> 2658 : public false_type 2659{ 2660}; 2661 2662template <class _Tp, class _Arg> 2663struct is_assignable 2664 : public __is_assignable_imp<_Tp, _Arg> {}; 2665 2666#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2667template <class _Tp, class _Arg> 2668_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v 2669 = is_assignable<_Tp, _Arg>::value; 2670#endif 2671 2672#endif // __has_keyword(__is_assignable) 2673 2674// is_copy_assignable 2675 2676template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2677 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2678 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2679 2680#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2681template <class _Tp> 2682_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_assignable_v 2683 = is_copy_assignable<_Tp>::value; 2684#endif 2685 2686// is_move_assignable 2687 2688template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2689 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2690 typename add_rvalue_reference<_Tp>::type> {}; 2691 2692#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2693template <class _Tp> 2694_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_assignable_v 2695 = is_move_assignable<_Tp>::value; 2696#endif 2697 2698// is_destructible 2699 2700#if __has_keyword(__is_destructible) 2701 2702template<class _Tp> 2703struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 2704 2705#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2706template <class _Tp> 2707_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v = __is_destructible(_Tp); 2708#endif 2709 2710#else // __has_keyword(__is_destructible) 2711 2712// if it's a reference, return true 2713// if it's a function, return false 2714// if it's void, return false 2715// if it's an array of unknown bound, return false 2716// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 2717// where _Up is remove_all_extents<_Tp>::type 2718 2719template <class> 2720struct __is_destructible_apply { typedef int type; }; 2721 2722template <typename _Tp> 2723struct __is_destructor_wellformed { 2724 template <typename _Tp1> 2725 static char __test ( 2726 typename __is_destructible_apply<decltype(_VSTD::declval<_Tp1&>().~_Tp1())>::type 2727 ); 2728 2729 template <typename _Tp1> 2730 static __two __test (...); 2731 2732 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2733}; 2734 2735template <class _Tp, bool> 2736struct __destructible_imp; 2737 2738template <class _Tp> 2739struct __destructible_imp<_Tp, false> 2740 : public _VSTD::integral_constant<bool, 2741 __is_destructor_wellformed<typename _VSTD::remove_all_extents<_Tp>::type>::value> {}; 2742 2743template <class _Tp> 2744struct __destructible_imp<_Tp, true> 2745 : public _VSTD::true_type {}; 2746 2747template <class _Tp, bool> 2748struct __destructible_false; 2749 2750template <class _Tp> 2751struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, _VSTD::is_reference<_Tp>::value> {}; 2752 2753template <class _Tp> 2754struct __destructible_false<_Tp, true> : public _VSTD::false_type {}; 2755 2756template <class _Tp> 2757struct is_destructible 2758 : public __destructible_false<_Tp, _VSTD::is_function<_Tp>::value> {}; 2759 2760template <class _Tp> 2761struct is_destructible<_Tp[]> 2762 : public _VSTD::false_type {}; 2763 2764template <> 2765struct is_destructible<void> 2766 : public _VSTD::false_type {}; 2767 2768#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2769template <class _Tp> 2770_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v 2771 = is_destructible<_Tp>::value; 2772#endif 2773 2774#endif // __has_keyword(__is_destructible) 2775 2776// move 2777 2778template <class _Tp> 2779inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2780typename remove_reference<_Tp>::type&& 2781move(_Tp&& __t) _NOEXCEPT 2782{ 2783 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 2784 return static_cast<_Up&&>(__t); 2785} 2786 2787template <class _Tp> 2788inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2789_Tp&& 2790forward(typename remove_reference<_Tp>::type& __t) _NOEXCEPT 2791{ 2792 return static_cast<_Tp&&>(__t); 2793} 2794 2795template <class _Tp> 2796inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2797_Tp&& 2798forward(typename remove_reference<_Tp>::type&& __t) _NOEXCEPT 2799{ 2800 static_assert(!is_lvalue_reference<_Tp>::value, 2801 "can not forward an rvalue as an lvalue"); 2802 return static_cast<_Tp&&>(__t); 2803} 2804 2805template <class _Tp> 2806inline _LIBCPP_INLINE_VISIBILITY 2807typename decay<_Tp>::type 2808__decay_copy(_Tp&& __t) 2809{ 2810 return _VSTD::forward<_Tp>(__t); 2811} 2812 2813template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2814struct __member_pointer_traits_imp 2815{ 2816}; 2817 2818template <class _Rp, class _Class, class ..._Param> 2819struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 2820{ 2821 typedef _Class _ClassType; 2822 typedef _Rp _ReturnType; 2823 typedef _Rp (_FnType) (_Param...); 2824}; 2825 2826template <class _Rp, class _Class, class ..._Param> 2827struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 2828{ 2829 typedef _Class _ClassType; 2830 typedef _Rp _ReturnType; 2831 typedef _Rp (_FnType) (_Param..., ...); 2832}; 2833 2834template <class _Rp, class _Class, class ..._Param> 2835struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 2836{ 2837 typedef _Class const _ClassType; 2838 typedef _Rp _ReturnType; 2839 typedef _Rp (_FnType) (_Param...); 2840}; 2841 2842template <class _Rp, class _Class, class ..._Param> 2843struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 2844{ 2845 typedef _Class const _ClassType; 2846 typedef _Rp _ReturnType; 2847 typedef _Rp (_FnType) (_Param..., ...); 2848}; 2849 2850template <class _Rp, class _Class, class ..._Param> 2851struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 2852{ 2853 typedef _Class volatile _ClassType; 2854 typedef _Rp _ReturnType; 2855 typedef _Rp (_FnType) (_Param...); 2856}; 2857 2858template <class _Rp, class _Class, class ..._Param> 2859struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 2860{ 2861 typedef _Class volatile _ClassType; 2862 typedef _Rp _ReturnType; 2863 typedef _Rp (_FnType) (_Param..., ...); 2864}; 2865 2866template <class _Rp, class _Class, class ..._Param> 2867struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 2868{ 2869 typedef _Class const volatile _ClassType; 2870 typedef _Rp _ReturnType; 2871 typedef _Rp (_FnType) (_Param...); 2872}; 2873 2874template <class _Rp, class _Class, class ..._Param> 2875struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2876{ 2877 typedef _Class const volatile _ClassType; 2878 typedef _Rp _ReturnType; 2879 typedef _Rp (_FnType) (_Param..., ...); 2880}; 2881 2882#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2883 2884template <class _Rp, class _Class, class ..._Param> 2885struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 2886{ 2887 typedef _Class& _ClassType; 2888 typedef _Rp _ReturnType; 2889 typedef _Rp (_FnType) (_Param...); 2890}; 2891 2892template <class _Rp, class _Class, class ..._Param> 2893struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 2894{ 2895 typedef _Class& _ClassType; 2896 typedef _Rp _ReturnType; 2897 typedef _Rp (_FnType) (_Param..., ...); 2898}; 2899 2900template <class _Rp, class _Class, class ..._Param> 2901struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 2902{ 2903 typedef _Class const& _ClassType; 2904 typedef _Rp _ReturnType; 2905 typedef _Rp (_FnType) (_Param...); 2906}; 2907 2908template <class _Rp, class _Class, class ..._Param> 2909struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 2910{ 2911 typedef _Class const& _ClassType; 2912 typedef _Rp _ReturnType; 2913 typedef _Rp (_FnType) (_Param..., ...); 2914}; 2915 2916template <class _Rp, class _Class, class ..._Param> 2917struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 2918{ 2919 typedef _Class volatile& _ClassType; 2920 typedef _Rp _ReturnType; 2921 typedef _Rp (_FnType) (_Param...); 2922}; 2923 2924template <class _Rp, class _Class, class ..._Param> 2925struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 2926{ 2927 typedef _Class volatile& _ClassType; 2928 typedef _Rp _ReturnType; 2929 typedef _Rp (_FnType) (_Param..., ...); 2930}; 2931 2932template <class _Rp, class _Class, class ..._Param> 2933struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 2934{ 2935 typedef _Class const volatile& _ClassType; 2936 typedef _Rp _ReturnType; 2937 typedef _Rp (_FnType) (_Param...); 2938}; 2939 2940template <class _Rp, class _Class, class ..._Param> 2941struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 2942{ 2943 typedef _Class const volatile& _ClassType; 2944 typedef _Rp _ReturnType; 2945 typedef _Rp (_FnType) (_Param..., ...); 2946}; 2947 2948template <class _Rp, class _Class, class ..._Param> 2949struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 2950{ 2951 typedef _Class&& _ClassType; 2952 typedef _Rp _ReturnType; 2953 typedef _Rp (_FnType) (_Param...); 2954}; 2955 2956template <class _Rp, class _Class, class ..._Param> 2957struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 2958{ 2959 typedef _Class&& _ClassType; 2960 typedef _Rp _ReturnType; 2961 typedef _Rp (_FnType) (_Param..., ...); 2962}; 2963 2964template <class _Rp, class _Class, class ..._Param> 2965struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 2966{ 2967 typedef _Class const&& _ClassType; 2968 typedef _Rp _ReturnType; 2969 typedef _Rp (_FnType) (_Param...); 2970}; 2971 2972template <class _Rp, class _Class, class ..._Param> 2973struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 2974{ 2975 typedef _Class const&& _ClassType; 2976 typedef _Rp _ReturnType; 2977 typedef _Rp (_FnType) (_Param..., ...); 2978}; 2979 2980template <class _Rp, class _Class, class ..._Param> 2981struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 2982{ 2983 typedef _Class volatile&& _ClassType; 2984 typedef _Rp _ReturnType; 2985 typedef _Rp (_FnType) (_Param...); 2986}; 2987 2988template <class _Rp, class _Class, class ..._Param> 2989struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 2990{ 2991 typedef _Class volatile&& _ClassType; 2992 typedef _Rp _ReturnType; 2993 typedef _Rp (_FnType) (_Param..., ...); 2994}; 2995 2996template <class _Rp, class _Class, class ..._Param> 2997struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 2998{ 2999 typedef _Class const volatile&& _ClassType; 3000 typedef _Rp _ReturnType; 3001 typedef _Rp (_FnType) (_Param...); 3002}; 3003 3004template <class _Rp, class _Class, class ..._Param> 3005struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 3006{ 3007 typedef _Class const volatile&& _ClassType; 3008 typedef _Rp _ReturnType; 3009 typedef _Rp (_FnType) (_Param..., ...); 3010}; 3011 3012#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 3013 3014 3015template <class _Rp, class _Class> 3016struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 3017{ 3018 typedef _Class _ClassType; 3019 typedef _Rp _ReturnType; 3020}; 3021 3022template <class _MP> 3023struct __member_pointer_traits 3024 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 3025 is_member_function_pointer<_MP>::value, 3026 is_member_object_pointer<_MP>::value> 3027{ 3028// typedef ... _ClassType; 3029// typedef ... _ReturnType; 3030// typedef ... _FnType; 3031}; 3032 3033 3034template <class _DecayedFp> 3035struct __member_pointer_class_type {}; 3036 3037template <class _Ret, class _ClassType> 3038struct __member_pointer_class_type<_Ret _ClassType::*> { 3039 typedef _ClassType type; 3040}; 3041 3042// template <class T, class... Args> struct is_constructible; 3043 3044#if defined(_LIBCPP_COMPILER_GCC) && _GNUC_VER_NEW >= 10000 3045# define _LIBCPP_GCC_SUPPORTS_IS_CONSTRUCTIBLE 3046#endif 3047 3048#if !defined(_LIBCPP_CXX03_LANG) && !__has_feature(is_constructible) && !defined(_LIBCPP_GCC_SUPPORTS_IS_CONSTRUCTIBLE) 3049 3050template <class _Tp, class... _Args> 3051struct __libcpp_is_constructible; 3052 3053template <class _To, class _From> 3054struct __is_invalid_base_to_derived_cast { 3055 static_assert(is_reference<_To>::value, "Wrong specialization"); 3056 using _RawFrom = __uncvref_t<_From>; 3057 using _RawTo = __uncvref_t<_To>; 3058 static const bool value = _And< 3059 _IsNotSame<_RawFrom, _RawTo>, 3060 is_base_of<_RawFrom, _RawTo>, 3061 _Not<__libcpp_is_constructible<_RawTo, _From>> 3062 >::value; 3063}; 3064 3065template <class _To, class _From> 3066struct __is_invalid_lvalue_to_rvalue_cast : false_type { 3067 static_assert(is_reference<_To>::value, "Wrong specialization"); 3068}; 3069 3070template <class _ToRef, class _FromRef> 3071struct __is_invalid_lvalue_to_rvalue_cast<_ToRef&&, _FromRef&> { 3072 using _RawFrom = __uncvref_t<_FromRef>; 3073 using _RawTo = __uncvref_t<_ToRef>; 3074 static const bool value = _And< 3075 _Not<is_function<_RawTo>>, 3076 _Or< 3077 _IsSame<_RawFrom, _RawTo>, 3078 is_base_of<_RawTo, _RawFrom>> 3079 >::value; 3080}; 3081 3082struct __is_constructible_helper 3083{ 3084 template <class _To> 3085 static void __eat(_To); 3086 3087 // This overload is needed to work around a Clang bug that disallows 3088 // static_cast<T&&>(e) for non-reference-compatible types. 3089 // Example: static_cast<int&&>(declval<double>()); 3090 // NOTE: The static_cast implementation below is required to support 3091 // classes with explicit conversion operators. 3092 template <class _To, class _From, 3093 class = decltype(__eat<_To>(_VSTD::declval<_From>()))> 3094 static true_type __test_cast(int); 3095 3096 template <class _To, class _From, 3097 class = decltype(static_cast<_To>(_VSTD::declval<_From>()))> 3098 static integral_constant<bool, 3099 !__is_invalid_base_to_derived_cast<_To, _From>::value && 3100 !__is_invalid_lvalue_to_rvalue_cast<_To, _From>::value 3101 > __test_cast(long); 3102 3103 template <class, class> 3104 static false_type __test_cast(...); 3105 3106 template <class _Tp, class ..._Args, 3107 class = decltype(_Tp(_VSTD::declval<_Args>()...))> 3108 static true_type __test_nary(int); 3109 template <class _Tp, class...> 3110 static false_type __test_nary(...); 3111 3112 template <class _Tp, class _A0, class = decltype(::new _Tp(_VSTD::declval<_A0>()))> 3113 static is_destructible<_Tp> __test_unary(int); 3114 template <class, class> 3115 static false_type __test_unary(...); 3116}; 3117 3118template <class _Tp, bool = is_void<_Tp>::value> 3119struct __is_default_constructible 3120 : decltype(__is_constructible_helper::__test_nary<_Tp>(0)) 3121{}; 3122 3123template <class _Tp> 3124struct __is_default_constructible<_Tp, true> : false_type {}; 3125 3126template <class _Tp> 3127struct __is_default_constructible<_Tp[], false> : false_type {}; 3128 3129template <class _Tp, size_t _Nx> 3130struct __is_default_constructible<_Tp[_Nx], false> 3131 : __is_default_constructible<typename remove_all_extents<_Tp>::type> {}; 3132 3133template <class _Tp, class... _Args> 3134struct __libcpp_is_constructible 3135{ 3136 static_assert(sizeof...(_Args) > 1, "Wrong specialization"); 3137 typedef decltype(__is_constructible_helper::__test_nary<_Tp, _Args...>(0)) 3138 type; 3139}; 3140 3141template <class _Tp> 3142struct __libcpp_is_constructible<_Tp> : __is_default_constructible<_Tp> {}; 3143 3144template <class _Tp, class _A0> 3145struct __libcpp_is_constructible<_Tp, _A0> 3146 : public decltype(__is_constructible_helper::__test_unary<_Tp, _A0>(0)) 3147{}; 3148 3149template <class _Tp, class _A0> 3150struct __libcpp_is_constructible<_Tp&, _A0> 3151 : public decltype(__is_constructible_helper:: 3152 __test_cast<_Tp&, _A0>(0)) 3153{}; 3154 3155template <class _Tp, class _A0> 3156struct __libcpp_is_constructible<_Tp&&, _A0> 3157 : public decltype(__is_constructible_helper:: 3158 __test_cast<_Tp&&, _A0>(0)) 3159{}; 3160 3161#endif 3162 3163#if __has_feature(is_constructible) || defined(_LIBCPP_GCC_SUPPORTS_IS_CONSTRUCTIBLE) 3164template <class _Tp, class ..._Args> 3165struct _LIBCPP_TEMPLATE_VIS is_constructible 3166 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 3167 {}; 3168#else 3169template <class _Tp, class... _Args> 3170struct _LIBCPP_TEMPLATE_VIS is_constructible 3171 : public __libcpp_is_constructible<_Tp, _Args...>::type {}; 3172#endif 3173 3174#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3175template <class _Tp, class ..._Args> 3176_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_constructible_v 3177 = is_constructible<_Tp, _Args...>::value; 3178#endif 3179 3180// is_default_constructible 3181 3182template <class _Tp> 3183struct _LIBCPP_TEMPLATE_VIS is_default_constructible 3184 : public is_constructible<_Tp> 3185 {}; 3186 3187#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3188template <class _Tp> 3189_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_default_constructible_v 3190 = is_default_constructible<_Tp>::value; 3191#endif 3192 3193#ifndef _LIBCPP_CXX03_LANG 3194// First of all, we can't implement this check in C++03 mode because the {} 3195// default initialization syntax isn't valid. 3196// Second, we implement the trait in a funny manner with two defaulted template 3197// arguments to workaround Clang's PR43454. 3198template <class _Tp> 3199void __test_implicit_default_constructible(_Tp); 3200 3201template <class _Tp, class = void, bool = is_default_constructible<_Tp>::value> 3202struct __is_implicitly_default_constructible 3203 : false_type 3204{ }; 3205 3206template <class _Tp> 3207struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true> 3208 : true_type 3209{ }; 3210 3211template <class _Tp> 3212struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false> 3213 : false_type 3214{ }; 3215#endif // !C++03 3216 3217// is_copy_constructible 3218 3219template <class _Tp> 3220struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 3221 : public is_constructible<_Tp, 3222 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3223 3224#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3225template <class _Tp> 3226_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_constructible_v 3227 = is_copy_constructible<_Tp>::value; 3228#endif 3229 3230// is_move_constructible 3231 3232template <class _Tp> 3233struct _LIBCPP_TEMPLATE_VIS is_move_constructible 3234 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3235 {}; 3236 3237#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3238template <class _Tp> 3239_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_constructible_v 3240 = is_move_constructible<_Tp>::value; 3241#endif 3242 3243// is_trivially_constructible 3244 3245#if __has_feature(is_trivially_constructible) || _GNUC_VER >= 501 3246 3247template <class _Tp, class... _Args> 3248struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 3249 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 3250{ 3251}; 3252 3253#else // !__has_feature(is_trivially_constructible) 3254 3255template <class _Tp, class... _Args> 3256struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 3257 : false_type 3258{ 3259}; 3260 3261template <class _Tp> 3262struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp> 3263#if __has_feature(has_trivial_constructor) || defined(_LIBCPP_COMPILER_GCC) 3264 : integral_constant<bool, __has_trivial_constructor(_Tp)> 3265#else 3266 : integral_constant<bool, is_scalar<_Tp>::value> 3267#endif 3268{ 3269}; 3270 3271template <class _Tp> 3272struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&&> 3273 : integral_constant<bool, is_scalar<_Tp>::value> 3274{ 3275}; 3276 3277template <class _Tp> 3278struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, const _Tp&> 3279 : integral_constant<bool, is_scalar<_Tp>::value> 3280{ 3281}; 3282 3283template <class _Tp> 3284struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&> 3285 : integral_constant<bool, is_scalar<_Tp>::value> 3286{ 3287}; 3288 3289#endif // !__has_feature(is_trivially_constructible) 3290 3291 3292#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3293template <class _Tp, class... _Args> 3294_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_constructible_v 3295 = is_trivially_constructible<_Tp, _Args...>::value; 3296#endif 3297 3298// is_trivially_default_constructible 3299 3300template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 3301 : public is_trivially_constructible<_Tp> 3302 {}; 3303 3304#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3305template <class _Tp> 3306_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_default_constructible_v 3307 = is_trivially_default_constructible<_Tp>::value; 3308#endif 3309 3310// is_trivially_copy_constructible 3311 3312template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 3313 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 3314 {}; 3315 3316#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3317template <class _Tp> 3318_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_constructible_v 3319 = is_trivially_copy_constructible<_Tp>::value; 3320#endif 3321 3322// is_trivially_move_constructible 3323 3324template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 3325 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3326 {}; 3327 3328#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3329template <class _Tp> 3330_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_constructible_v 3331 = is_trivially_move_constructible<_Tp>::value; 3332#endif 3333 3334// is_trivially_assignable 3335 3336#if __has_feature(is_trivially_assignable) || _GNUC_VER >= 501 3337 3338template <class _Tp, class _Arg> 3339struct is_trivially_assignable 3340 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 3341{ 3342}; 3343 3344#else // !__has_feature(is_trivially_assignable) 3345 3346template <class _Tp, class _Arg> 3347struct is_trivially_assignable 3348 : public false_type {}; 3349 3350template <class _Tp> 3351struct is_trivially_assignable<_Tp&, _Tp> 3352 : integral_constant<bool, is_scalar<_Tp>::value> {}; 3353 3354template <class _Tp> 3355struct is_trivially_assignable<_Tp&, _Tp&> 3356 : integral_constant<bool, is_scalar<_Tp>::value> {}; 3357 3358template <class _Tp> 3359struct is_trivially_assignable<_Tp&, const _Tp&> 3360 : integral_constant<bool, is_scalar<_Tp>::value> {}; 3361 3362template <class _Tp> 3363struct is_trivially_assignable<_Tp&, _Tp&&> 3364 : integral_constant<bool, is_scalar<_Tp>::value> {}; 3365 3366#endif // !__has_feature(is_trivially_assignable) 3367 3368#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3369template <class _Tp, class _Arg> 3370_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_assignable_v 3371 = is_trivially_assignable<_Tp, _Arg>::value; 3372#endif 3373 3374// is_trivially_copy_assignable 3375 3376template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 3377 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3378 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3379 3380#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3381template <class _Tp> 3382_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_assignable_v 3383 = is_trivially_copy_assignable<_Tp>::value; 3384#endif 3385 3386// is_trivially_move_assignable 3387 3388template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3389 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3390 typename add_rvalue_reference<_Tp>::type> 3391 {}; 3392 3393#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3394template <class _Tp> 3395_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_assignable_v 3396 = is_trivially_move_assignable<_Tp>::value; 3397#endif 3398 3399// is_trivially_destructible 3400 3401#if __has_keyword(__is_trivially_destructible) 3402 3403template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3404 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3405 3406#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3407 3408template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3409 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3410 3411#else 3412 3413template <class _Tp> struct __libcpp_trivial_destructor 3414 : public integral_constant<bool, is_scalar<_Tp>::value || 3415 is_reference<_Tp>::value> {}; 3416 3417template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3418 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3419 3420template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3421 : public false_type {}; 3422 3423#endif 3424 3425#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3426template <class _Tp> 3427_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_destructible_v 3428 = is_trivially_destructible<_Tp>::value; 3429#endif 3430 3431// is_nothrow_constructible 3432 3433#if __has_keyword(__is_nothrow_constructible) 3434 3435template <class _Tp, class... _Args> 3436struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3437 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3438 3439#else 3440 3441template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3442 3443template <class _Tp, class... _Args> 3444struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3445 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3446{ 3447}; 3448 3449template <class _Tp> 3450void __implicit_conversion_to(_Tp) noexcept { } 3451 3452template <class _Tp, class _Arg> 3453struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3454 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3455{ 3456}; 3457 3458template <class _Tp, bool _IsReference, class... _Args> 3459struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3460 : public false_type 3461{ 3462}; 3463 3464template <class _Tp, class... _Args> 3465struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3466 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3467{ 3468}; 3469 3470template <class _Tp, size_t _Ns> 3471struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3472 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3473{ 3474}; 3475 3476#endif // _LIBCPP_HAS_NO_NOEXCEPT 3477 3478 3479#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3480template <class _Tp, class ..._Args> 3481_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_constructible_v 3482 = is_nothrow_constructible<_Tp, _Args...>::value; 3483#endif 3484 3485// is_nothrow_default_constructible 3486 3487template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3488 : public is_nothrow_constructible<_Tp> 3489 {}; 3490 3491#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3492template <class _Tp> 3493_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_default_constructible_v 3494 = is_nothrow_default_constructible<_Tp>::value; 3495#endif 3496 3497// is_nothrow_copy_constructible 3498 3499template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3500 : public is_nothrow_constructible<_Tp, 3501 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3502 3503#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3504template <class _Tp> 3505_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_constructible_v 3506 = is_nothrow_copy_constructible<_Tp>::value; 3507#endif 3508 3509// is_nothrow_move_constructible 3510 3511template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3512 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3513 {}; 3514 3515#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3516template <class _Tp> 3517_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_constructible_v 3518 = is_nothrow_move_constructible<_Tp>::value; 3519#endif 3520 3521// is_nothrow_assignable 3522 3523#if __has_keyword(__is_nothrow_assignable) 3524 3525template <class _Tp, class _Arg> 3526struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3527 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3528 3529#else 3530 3531template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3532 3533template <class _Tp, class _Arg> 3534struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3535 : public false_type 3536{ 3537}; 3538 3539template <class _Tp, class _Arg> 3540struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3541 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>()) > 3542{ 3543}; 3544 3545template <class _Tp, class _Arg> 3546struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3547 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3548{ 3549}; 3550 3551#endif // _LIBCPP_HAS_NO_NOEXCEPT 3552 3553#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3554template <class _Tp, class _Arg> 3555_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_assignable_v 3556 = is_nothrow_assignable<_Tp, _Arg>::value; 3557#endif 3558 3559// is_nothrow_copy_assignable 3560 3561template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3562 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3563 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3564 3565#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3566template <class _Tp> 3567_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_assignable_v 3568 = is_nothrow_copy_assignable<_Tp>::value; 3569#endif 3570 3571// is_nothrow_move_assignable 3572 3573template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 3574 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3575 typename add_rvalue_reference<_Tp>::type> 3576 {}; 3577 3578#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3579template <class _Tp> 3580_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_assignable_v 3581 = is_nothrow_move_assignable<_Tp>::value; 3582#endif 3583 3584// is_nothrow_destructible 3585 3586#if !defined(_LIBCPP_CXX03_LANG) 3587 3588template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3589 3590template <class _Tp> 3591struct __libcpp_is_nothrow_destructible<false, _Tp> 3592 : public false_type 3593{ 3594}; 3595 3596template <class _Tp> 3597struct __libcpp_is_nothrow_destructible<true, _Tp> 3598 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>().~_Tp()) > 3599{ 3600}; 3601 3602template <class _Tp> 3603struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3604 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3605{ 3606}; 3607 3608template <class _Tp, size_t _Ns> 3609struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3610 : public is_nothrow_destructible<_Tp> 3611{ 3612}; 3613 3614template <class _Tp> 3615struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3616 : public true_type 3617{ 3618}; 3619 3620template <class _Tp> 3621struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3622 : public true_type 3623{ 3624}; 3625 3626#else 3627 3628template <class _Tp> struct __libcpp_nothrow_destructor 3629 : public integral_constant<bool, is_scalar<_Tp>::value || 3630 is_reference<_Tp>::value> {}; 3631 3632template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3633 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3634 3635template <class _Tp> 3636struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3637 : public false_type {}; 3638 3639#endif 3640 3641#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3642template <class _Tp> 3643_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_destructible_v 3644 = is_nothrow_destructible<_Tp>::value; 3645#endif 3646 3647// is_pod 3648 3649#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3650 3651template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3652 : public integral_constant<bool, __is_pod(_Tp)> {}; 3653 3654#else 3655 3656template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3657 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3658 is_trivially_copy_constructible<_Tp>::value && 3659 is_trivially_copy_assignable<_Tp>::value && 3660 is_trivially_destructible<_Tp>::value> {}; 3661 3662#endif 3663 3664#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3665template <class _Tp> 3666_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pod_v 3667 = is_pod<_Tp>::value; 3668#endif 3669 3670// is_literal_type; 3671 3672template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_literal_type 3673 : public integral_constant<bool, __is_literal_type(_Tp)> 3674 {}; 3675 3676#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3677template <class _Tp> 3678_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_literal_type_v 3679 = is_literal_type<_Tp>::value; 3680#endif 3681 3682// is_standard_layout; 3683 3684template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3685#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3686 : public integral_constant<bool, __is_standard_layout(_Tp)> 3687#else 3688 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3689#endif 3690 {}; 3691 3692#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3693template <class _Tp> 3694_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_standard_layout_v 3695 = is_standard_layout<_Tp>::value; 3696#endif 3697 3698// is_trivially_copyable; 3699 3700template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3701#if __has_feature(is_trivially_copyable) 3702 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3703#elif _GNUC_VER >= 501 3704 : public integral_constant<bool, !is_volatile<_Tp>::value && __is_trivially_copyable(_Tp)> 3705#else 3706 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3707#endif 3708 {}; 3709 3710#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3711template <class _Tp> 3712_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copyable_v 3713 = is_trivially_copyable<_Tp>::value; 3714#endif 3715 3716// is_trivial; 3717 3718template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3719#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3720 : public integral_constant<bool, __is_trivial(_Tp)> 3721#else 3722 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3723 is_trivially_default_constructible<_Tp>::value> 3724#endif 3725 {}; 3726 3727#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3728template <class _Tp> 3729_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivial_v 3730 = is_trivial<_Tp>::value; 3731#endif 3732 3733template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3734template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3735template <class _Tp> struct __is_reference_wrapper 3736 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3737 3738#ifndef _LIBCPP_CXX03_LANG 3739 3740template <class _Fp, class _A0, 3741 class _DecayFp = typename decay<_Fp>::type, 3742 class _DecayA0 = typename decay<_A0>::type, 3743 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3744using __enable_if_bullet1 = typename enable_if 3745 < 3746 is_member_function_pointer<_DecayFp>::value 3747 && is_base_of<_ClassT, _DecayA0>::value 3748 >::type; 3749 3750template <class _Fp, class _A0, 3751 class _DecayFp = typename decay<_Fp>::type, 3752 class _DecayA0 = typename decay<_A0>::type> 3753using __enable_if_bullet2 = typename enable_if 3754 < 3755 is_member_function_pointer<_DecayFp>::value 3756 && __is_reference_wrapper<_DecayA0>::value 3757 >::type; 3758 3759template <class _Fp, class _A0, 3760 class _DecayFp = typename decay<_Fp>::type, 3761 class _DecayA0 = typename decay<_A0>::type, 3762 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3763using __enable_if_bullet3 = typename enable_if 3764 < 3765 is_member_function_pointer<_DecayFp>::value 3766 && !is_base_of<_ClassT, _DecayA0>::value 3767 && !__is_reference_wrapper<_DecayA0>::value 3768 >::type; 3769 3770template <class _Fp, class _A0, 3771 class _DecayFp = typename decay<_Fp>::type, 3772 class _DecayA0 = typename decay<_A0>::type, 3773 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3774using __enable_if_bullet4 = typename enable_if 3775 < 3776 is_member_object_pointer<_DecayFp>::value 3777 && is_base_of<_ClassT, _DecayA0>::value 3778 >::type; 3779 3780template <class _Fp, class _A0, 3781 class _DecayFp = typename decay<_Fp>::type, 3782 class _DecayA0 = typename decay<_A0>::type> 3783using __enable_if_bullet5 = typename enable_if 3784 < 3785 is_member_object_pointer<_DecayFp>::value 3786 && __is_reference_wrapper<_DecayA0>::value 3787 >::type; 3788 3789template <class _Fp, class _A0, 3790 class _DecayFp = typename decay<_Fp>::type, 3791 class _DecayA0 = typename decay<_A0>::type, 3792 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3793using __enable_if_bullet6 = typename enable_if 3794 < 3795 is_member_object_pointer<_DecayFp>::value 3796 && !is_base_of<_ClassT, _DecayA0>::value 3797 && !__is_reference_wrapper<_DecayA0>::value 3798 >::type; 3799 3800// __invoke forward declarations 3801 3802// fall back - none of the bullets 3803 3804#define _LIBCPP_INVOKE_RETURN(...) \ 3805 noexcept(noexcept(__VA_ARGS__)) -> decltype(__VA_ARGS__) \ 3806 { return __VA_ARGS__; } 3807 3808template <class ..._Args> 3809auto __invoke(__any, _Args&& ...__args) -> __nat; 3810 3811template <class ..._Args> 3812auto __invoke_constexpr(__any, _Args&& ...__args) -> __nat; 3813 3814// bullets 1, 2 and 3 3815 3816template <class _Fp, class _A0, class ..._Args, 3817 class = __enable_if_bullet1<_Fp, _A0>> 3818inline _LIBCPP_INLINE_VISIBILITY 3819_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3820__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3821_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3822 3823template <class _Fp, class _A0, class ..._Args, 3824 class = __enable_if_bullet1<_Fp, _A0>> 3825inline _LIBCPP_INLINE_VISIBILITY 3826_LIBCPP_CONSTEXPR auto 3827__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3828_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3829 3830template <class _Fp, class _A0, class ..._Args, 3831 class = __enable_if_bullet2<_Fp, _A0>> 3832inline _LIBCPP_INLINE_VISIBILITY 3833_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3834__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3835_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3836 3837template <class _Fp, class _A0, class ..._Args, 3838 class = __enable_if_bullet2<_Fp, _A0>> 3839inline _LIBCPP_INLINE_VISIBILITY 3840_LIBCPP_CONSTEXPR auto 3841__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3842_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3843 3844template <class _Fp, class _A0, class ..._Args, 3845 class = __enable_if_bullet3<_Fp, _A0>> 3846inline _LIBCPP_INLINE_VISIBILITY 3847_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3848__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3849_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3850 3851template <class _Fp, class _A0, class ..._Args, 3852 class = __enable_if_bullet3<_Fp, _A0>> 3853inline _LIBCPP_INLINE_VISIBILITY 3854_LIBCPP_CONSTEXPR auto 3855__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3856_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3857 3858// bullets 4, 5 and 6 3859 3860template <class _Fp, class _A0, 3861 class = __enable_if_bullet4<_Fp, _A0>> 3862inline _LIBCPP_INLINE_VISIBILITY 3863_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3864__invoke(_Fp&& __f, _A0&& __a0) 3865_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3866 3867template <class _Fp, class _A0, 3868 class = __enable_if_bullet4<_Fp, _A0>> 3869inline _LIBCPP_INLINE_VISIBILITY 3870_LIBCPP_CONSTEXPR auto 3871__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3872_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3873 3874template <class _Fp, class _A0, 3875 class = __enable_if_bullet5<_Fp, _A0>> 3876inline _LIBCPP_INLINE_VISIBILITY 3877_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3878__invoke(_Fp&& __f, _A0&& __a0) 3879_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3880 3881template <class _Fp, class _A0, 3882 class = __enable_if_bullet5<_Fp, _A0>> 3883inline _LIBCPP_INLINE_VISIBILITY 3884_LIBCPP_CONSTEXPR auto 3885__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3886_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3887 3888template <class _Fp, class _A0, 3889 class = __enable_if_bullet6<_Fp, _A0>> 3890inline _LIBCPP_INLINE_VISIBILITY 3891_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3892__invoke(_Fp&& __f, _A0&& __a0) 3893_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3894 3895template <class _Fp, class _A0, 3896 class = __enable_if_bullet6<_Fp, _A0>> 3897inline _LIBCPP_INLINE_VISIBILITY 3898_LIBCPP_CONSTEXPR auto 3899__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3900_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3901 3902// bullet 7 3903 3904template <class _Fp, class ..._Args> 3905inline _LIBCPP_INLINE_VISIBILITY 3906_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3907__invoke(_Fp&& __f, _Args&& ...__args) 3908_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3909 3910template <class _Fp, class ..._Args> 3911inline _LIBCPP_INLINE_VISIBILITY 3912_LIBCPP_CONSTEXPR auto 3913__invoke_constexpr(_Fp&& __f, _Args&& ...__args) 3914_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3915 3916#undef _LIBCPP_INVOKE_RETURN 3917 3918// __invokable 3919template <class _Ret, class _Fp, class ..._Args> 3920struct __invokable_r 3921{ 3922 template <class _XFp, class ..._XArgs> 3923 static auto __try_call(int) -> decltype( 3924 _VSTD::__invoke(_VSTD::declval<_XFp>(), _VSTD::declval<_XArgs>()...)); 3925 template <class _XFp, class ..._XArgs> 3926 static __nat __try_call(...); 3927 3928 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3929 // or incomplete array types as required by the standard. 3930 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3931 3932 using type = 3933 typename conditional< 3934 _IsNotSame<_Result, __nat>::value, 3935 typename conditional< 3936 is_void<_Ret>::value, 3937 true_type, 3938 is_convertible<_Result, _Ret> 3939 >::type, 3940 false_type 3941 >::type; 3942 static const bool value = type::value; 3943}; 3944template <class _Fp, class ..._Args> 3945using __invokable = __invokable_r<void, _Fp, _Args...>; 3946 3947template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3948struct __nothrow_invokable_r_imp { 3949 static const bool value = false; 3950}; 3951 3952template <class _Ret, class _Fp, class ..._Args> 3953struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3954{ 3955 typedef __nothrow_invokable_r_imp _ThisT; 3956 3957 template <class _Tp> 3958 static void __test_noexcept(_Tp) noexcept; 3959 3960 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3961 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...))); 3962}; 3963 3964template <class _Ret, class _Fp, class ..._Args> 3965struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3966{ 3967 static const bool value = noexcept( 3968 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...)); 3969}; 3970 3971template <class _Ret, class _Fp, class ..._Args> 3972using __nothrow_invokable_r = 3973 __nothrow_invokable_r_imp< 3974 __invokable_r<_Ret, _Fp, _Args...>::value, 3975 is_void<_Ret>::value, 3976 _Ret, _Fp, _Args... 3977 >; 3978 3979template <class _Fp, class ..._Args> 3980using __nothrow_invokable = 3981 __nothrow_invokable_r_imp< 3982 __invokable<_Fp, _Args...>::value, 3983 true, void, _Fp, _Args... 3984 >; 3985 3986template <class _Fp, class ..._Args> 3987struct __invoke_of 3988 : public enable_if< 3989 __invokable<_Fp, _Args...>::value, 3990 typename __invokable_r<void, _Fp, _Args...>::_Result> 3991{ 3992}; 3993 3994#endif // _LIBCPP_CXX03_LANG 3995 3996// result_of 3997 3998template <class _Callable> class result_of; 3999 4000#ifndef _LIBCPP_CXX03_LANG 4001 4002template <class _Fp, class ..._Args> 4003class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 4004 : public __invoke_of<_Fp, _Args...> 4005{ 4006}; 4007 4008#else // C++03 4009 4010template <class _Fn, bool, bool> 4011class __result_of 4012{ 4013}; 4014 4015template <class _Fn, class ..._Args> 4016class __result_of<_Fn(_Args...), true, false> 4017{ 4018public: 4019 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 4020}; 4021 4022template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 4023struct __result_of_mp; 4024 4025// member function pointer 4026 4027template <class _MP, class _Tp> 4028struct __result_of_mp<_MP, _Tp, true> 4029{ 4030 using type = typename __member_pointer_traits<_MP>::_ReturnType; 4031}; 4032 4033// member data pointer 4034 4035template <class _MP, class _Tp, bool> 4036struct __result_of_mdp; 4037 4038template <class _Rp, class _Class, class _Tp> 4039struct __result_of_mdp<_Rp _Class::*, _Tp, false> 4040{ 4041 using type = typename __apply_cv<decltype(*_VSTD::declval<_Tp>()), _Rp>::type&; 4042}; 4043 4044template <class _Rp, class _Class, class _Tp> 4045struct __result_of_mdp<_Rp _Class::*, _Tp, true> 4046{ 4047 using type = typename __apply_cv<_Tp, _Rp>::type&; 4048}; 4049 4050template <class _Rp, class _Class, class _Tp> 4051struct __result_of_mp<_Rp _Class::*, _Tp, false> 4052 : public __result_of_mdp<_Rp _Class::*, _Tp, 4053 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 4054{ 4055}; 4056 4057template <class _Fn, class _Tp> 4058class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 4059 : public __result_of_mp<typename remove_reference<_Fn>::type, 4060 _Tp, 4061 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 4062{ 4063}; 4064 4065template <class _Fn, class _Tp, class ..._Args> 4066class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 4067 : public __result_of_mp<typename remove_reference<_Fn>::type, 4068 _Tp, 4069 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 4070{ 4071}; 4072 4073template <class _Fn, class ..._Args> 4074class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 4075 : public __result_of<_Fn(_Args...), 4076 is_class<typename remove_reference<_Fn>::type>::value || 4077 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 4078 is_member_pointer<typename remove_reference<_Fn>::type>::value 4079 > 4080{ 4081}; 4082 4083#endif // C++03 4084 4085#if _LIBCPP_STD_VER > 11 4086template <class _Tp> using result_of_t = typename result_of<_Tp>::type; 4087#endif 4088 4089#if _LIBCPP_STD_VER > 14 4090 4091// invoke_result 4092 4093template <class _Fn, class... _Args> 4094struct _LIBCPP_TEMPLATE_VIS invoke_result 4095 : __invoke_of<_Fn, _Args...> 4096{ 4097}; 4098 4099template <class _Fn, class... _Args> 4100using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 4101 4102// is_invocable 4103 4104template <class _Fn, class ..._Args> 4105struct _LIBCPP_TEMPLATE_VIS is_invocable 4106 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 4107 4108template <class _Ret, class _Fn, class ..._Args> 4109struct _LIBCPP_TEMPLATE_VIS is_invocable_r 4110 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 4111 4112template <class _Fn, class ..._Args> 4113_LIBCPP_INLINE_VAR constexpr bool is_invocable_v 4114 = is_invocable<_Fn, _Args...>::value; 4115 4116template <class _Ret, class _Fn, class ..._Args> 4117_LIBCPP_INLINE_VAR constexpr bool is_invocable_r_v 4118 = is_invocable_r<_Ret, _Fn, _Args...>::value; 4119 4120// is_nothrow_invocable 4121 4122template <class _Fn, class ..._Args> 4123struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 4124 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 4125 4126template <class _Ret, class _Fn, class ..._Args> 4127struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 4128 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 4129 4130template <class _Fn, class ..._Args> 4131_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_v 4132 = is_nothrow_invocable<_Fn, _Args...>::value; 4133 4134template <class _Ret, class _Fn, class ..._Args> 4135_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_r_v 4136 = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 4137 4138#endif // _LIBCPP_STD_VER > 14 4139 4140template <class _Tp> struct __is_swappable; 4141template <class _Tp> struct __is_nothrow_swappable; 4142 4143// swap, swap_ranges 4144 4145template <class _ForwardIterator1, class _ForwardIterator2> 4146inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4147_ForwardIterator2 4148swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2); 4149 4150template <class _Tp> 4151inline _LIBCPP_INLINE_VISIBILITY 4152#ifndef _LIBCPP_CXX03_LANG 4153typename enable_if 4154< 4155 is_move_constructible<_Tp>::value && 4156 is_move_assignable<_Tp>::value 4157>::type 4158#else 4159void 4160#endif 4161_LIBCPP_CONSTEXPR_AFTER_CXX17 4162swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 4163 is_nothrow_move_assignable<_Tp>::value) 4164{ 4165 _Tp __t(_VSTD::move(__x)); 4166 __x = _VSTD::move(__y); 4167 __y = _VSTD::move(__t); 4168} 4169 4170template<class _Tp, size_t _Np> 4171inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4172typename enable_if< 4173 __is_swappable<_Tp>::value 4174>::type 4175swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 4176{ 4177 _VSTD::swap_ranges(__a, __a + _Np, __b); 4178} 4179 4180template <class _ForwardIterator1, class _ForwardIterator2> 4181inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4182_ForwardIterator2 4183swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 4184{ 4185 for(; __first1 != __last1; ++__first1, (void) ++__first2) 4186 swap(*__first1, *__first2); 4187 return __first2; 4188} 4189 4190// iter_swap 4191 4192template <class _ForwardIterator1, class _ForwardIterator2> 4193inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4194void 4195iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b) 4196 // _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b))) 4197 _NOEXCEPT_(_NOEXCEPT_(swap(*_VSTD::declval<_ForwardIterator1>(), 4198 *_VSTD::declval<_ForwardIterator2>()))) 4199{ 4200 swap(*__a, *__b); 4201} 4202 4203// __swappable 4204 4205namespace __detail 4206{ 4207// ALL generic swap overloads MUST already have a declaration available at this point. 4208 4209template <class _Tp, class _Up = _Tp, 4210 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 4211struct __swappable_with 4212{ 4213 template <class _LHS, class _RHS> 4214 static decltype(swap(_VSTD::declval<_LHS>(), _VSTD::declval<_RHS>())) 4215 __test_swap(int); 4216 template <class, class> 4217 static __nat __test_swap(long); 4218 4219 // Extra parens are needed for the C++03 definition of decltype. 4220 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 4221 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 4222 4223 static const bool value = _IsNotSame<__swap1, __nat>::value 4224 && _IsNotSame<__swap2, __nat>::value; 4225}; 4226 4227template <class _Tp, class _Up> 4228struct __swappable_with<_Tp, _Up, false> : false_type {}; 4229 4230template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 4231struct __nothrow_swappable_with { 4232 static const bool value = 4233#ifndef _LIBCPP_HAS_NO_NOEXCEPT 4234 noexcept(swap(_VSTD::declval<_Tp>(), _VSTD::declval<_Up>())) 4235 && noexcept(swap(_VSTD::declval<_Up>(), _VSTD::declval<_Tp>())); 4236#else 4237 false; 4238#endif 4239}; 4240 4241template <class _Tp, class _Up> 4242struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 4243 4244} // __detail 4245 4246template <class _Tp> 4247struct __is_swappable 4248 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 4249{ 4250}; 4251 4252template <class _Tp> 4253struct __is_nothrow_swappable 4254 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 4255{ 4256}; 4257 4258#if _LIBCPP_STD_VER > 14 4259 4260template <class _Tp, class _Up> 4261struct _LIBCPP_TEMPLATE_VIS is_swappable_with 4262 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 4263{ 4264}; 4265 4266template <class _Tp> 4267struct _LIBCPP_TEMPLATE_VIS is_swappable 4268 : public conditional< 4269 __is_referenceable<_Tp>::value, 4270 is_swappable_with< 4271 typename add_lvalue_reference<_Tp>::type, 4272 typename add_lvalue_reference<_Tp>::type>, 4273 false_type 4274 >::type 4275{ 4276}; 4277 4278template <class _Tp, class _Up> 4279struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 4280 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 4281{ 4282}; 4283 4284template <class _Tp> 4285struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 4286 : public conditional< 4287 __is_referenceable<_Tp>::value, 4288 is_nothrow_swappable_with< 4289 typename add_lvalue_reference<_Tp>::type, 4290 typename add_lvalue_reference<_Tp>::type>, 4291 false_type 4292 >::type 4293{ 4294}; 4295 4296template <class _Tp, class _Up> 4297_LIBCPP_INLINE_VAR constexpr bool is_swappable_with_v 4298 = is_swappable_with<_Tp, _Up>::value; 4299 4300template <class _Tp> 4301_LIBCPP_INLINE_VAR constexpr bool is_swappable_v 4302 = is_swappable<_Tp>::value; 4303 4304template <class _Tp, class _Up> 4305_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_with_v 4306 = is_nothrow_swappable_with<_Tp, _Up>::value; 4307 4308template <class _Tp> 4309_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_v 4310 = is_nothrow_swappable<_Tp>::value; 4311 4312#endif // _LIBCPP_STD_VER > 14 4313 4314template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 4315 4316template <class _Tp> 4317struct __underlying_type_impl<_Tp, false> {}; 4318 4319template <class _Tp> 4320struct __underlying_type_impl<_Tp, true> 4321{ 4322 typedef __underlying_type(_Tp) type; 4323}; 4324 4325template <class _Tp> 4326struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 4327 4328#if _LIBCPP_STD_VER > 11 4329template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 4330#endif 4331 4332template <class _Tp, bool = is_enum<_Tp>::value> 4333struct __sfinae_underlying_type 4334{ 4335 typedef typename underlying_type<_Tp>::type type; 4336 typedef decltype(((type)1) + 0) __promoted_type; 4337}; 4338 4339template <class _Tp> 4340struct __sfinae_underlying_type<_Tp, false> {}; 4341 4342inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4343int __convert_to_integral(int __val) { return __val; } 4344 4345inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4346unsigned __convert_to_integral(unsigned __val) { return __val; } 4347 4348inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4349long __convert_to_integral(long __val) { return __val; } 4350 4351inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4352unsigned long __convert_to_integral(unsigned long __val) { return __val; } 4353 4354inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4355long long __convert_to_integral(long long __val) { return __val; } 4356 4357inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4358unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 4359 4360template<typename _Fp> 4361inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4362typename enable_if<is_floating_point<_Fp>::value, long long>::type 4363 __convert_to_integral(_Fp __val) { return __val; } 4364 4365#ifndef _LIBCPP_HAS_NO_INT128 4366inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4367__int128_t __convert_to_integral(__int128_t __val) { return __val; } 4368 4369inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4370__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 4371#endif 4372 4373template <class _Tp> 4374inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4375typename __sfinae_underlying_type<_Tp>::__promoted_type 4376__convert_to_integral(_Tp __val) { return __val; } 4377 4378#ifndef _LIBCPP_CXX03_LANG 4379 4380template <class _Tp> 4381struct __has_operator_addressof_member_imp 4382{ 4383 template <class _Up> 4384 static auto __test(int) 4385 -> typename __select_2nd<decltype(_VSTD::declval<_Up>().operator&()), true_type>::type; 4386 template <class> 4387 static auto __test(long) -> false_type; 4388 4389 static const bool value = decltype(__test<_Tp>(0))::value; 4390}; 4391 4392template <class _Tp> 4393struct __has_operator_addressof_free_imp 4394{ 4395 template <class _Up> 4396 static auto __test(int) 4397 -> typename __select_2nd<decltype(operator&(_VSTD::declval<_Up>())), true_type>::type; 4398 template <class> 4399 static auto __test(long) -> false_type; 4400 4401 static const bool value = decltype(__test<_Tp>(0))::value; 4402}; 4403 4404template <class _Tp> 4405struct __has_operator_addressof 4406 : public integral_constant<bool, __has_operator_addressof_member_imp<_Tp>::value 4407 || __has_operator_addressof_free_imp<_Tp>::value> 4408{}; 4409 4410#endif // _LIBCPP_CXX03_LANG 4411 4412// is_scoped_enum [meta.unary.prop] 4413 4414#if _LIBCPP_STD_VER > 20 4415template <class _Tp, bool = is_enum_v<_Tp> > 4416struct __is_scoped_enum_helper : false_type {}; 4417 4418template <class _Tp> 4419struct __is_scoped_enum_helper<_Tp, true> 4420 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 4421 4422template <class _Tp> 4423struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 4424 : public __is_scoped_enum_helper<_Tp> {}; 4425 4426template <class _Tp> 4427_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scoped_enum_v = 4428 is_scoped_enum<_Tp>::value; 4429#endif 4430 4431#if _LIBCPP_STD_VER > 14 4432 4433template <class... _Args> 4434struct conjunction : _And<_Args...> {}; 4435template<class... _Args> 4436_LIBCPP_INLINE_VAR constexpr bool conjunction_v 4437 = conjunction<_Args...>::value; 4438 4439template <class... _Args> 4440struct disjunction : _Or<_Args...> {}; 4441template<class... _Args> 4442_LIBCPP_INLINE_VAR constexpr bool disjunction_v 4443 = disjunction<_Args...>::value; 4444 4445template <class _Tp> 4446struct negation : _Not<_Tp> {}; 4447template<class _Tp> 4448_LIBCPP_INLINE_VAR constexpr bool negation_v 4449 = negation<_Tp>::value; 4450#endif // _LIBCPP_STD_VER > 14 4451 4452// These traits are used in __tree and __hash_table 4453struct __extract_key_fail_tag {}; 4454struct __extract_key_self_tag {}; 4455struct __extract_key_first_tag {}; 4456 4457template <class _ValTy, class _Key, 4458 class _RawValTy = typename __unconstref<_ValTy>::type> 4459struct __can_extract_key 4460 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 4461 __extract_key_fail_tag>::type {}; 4462 4463template <class _Pair, class _Key, class _First, class _Second> 4464struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 4465 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 4466 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 4467 4468// __can_extract_map_key uses true_type/false_type instead of the tags. 4469// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 4470// and _ValTy == _Key. 4471template <class _ValTy, class _Key, class _ContainerValueTy, 4472 class _RawValTy = typename __unconstref<_ValTy>::type> 4473struct __can_extract_map_key 4474 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 4475 4476// This specialization returns __extract_key_fail_tag for non-map containers 4477// because _Key == _ContainerValueTy 4478template <class _ValTy, class _Key, class _RawValTy> 4479struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 4480 : false_type {}; 4481 4482#ifndef _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED 4483#if _LIBCPP_STD_VER > 17 4484_LIBCPP_INLINE_VISIBILITY 4485inline constexpr bool is_constant_evaluated() noexcept { 4486 return __builtin_is_constant_evaluated(); 4487} 4488#endif 4489 4490inline _LIBCPP_CONSTEXPR 4491bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 4492#else 4493inline _LIBCPP_CONSTEXPR 4494bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; } 4495#endif 4496 4497template <class _CharT> 4498using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 4499 4500_LIBCPP_END_NAMESPACE_STD 4501 4502#if _LIBCPP_STD_VER > 14 4503// std::byte 4504namespace std // purposefully not versioned 4505{ 4506 4507 4508} 4509#endif 4510 4511#endif // _LIBCPP_TYPE_TRAITS 4512