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 / AppleClang 12.0.5, __is_pointer didn't work for Objective-C types. 838#if __has_keyword(__is_pointer) && \ 839 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1100) && \ 840 !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER < 1205) 841 842template<class _Tp> 843struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { }; 844 845#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 846template <class _Tp> 847_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v = __is_pointer(_Tp); 848#endif 849 850#else // __has_keyword(__is_pointer) 851 852template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 853template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 854 855template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 856#if defined(_LIBCPP_HAS_OBJC_ARC) 857template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 858template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 859template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 860template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 861#endif 862 863template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 864 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 865 866#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 867template <class _Tp> 868_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v 869 = is_pointer<_Tp>::value; 870#endif 871 872#endif // __has_keyword(__is_pointer) 873 874// is_reference 875 876#if __has_keyword(__is_lvalue_reference) && \ 877 __has_keyword(__is_rvalue_reference) && \ 878 __has_keyword(__is_reference) 879 880template<class _Tp> 881struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { }; 882 883template<class _Tp> 884struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { }; 885 886template<class _Tp> 887struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { }; 888 889#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 890template <class _Tp> 891_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v = __is_reference(_Tp); 892 893template <class _Tp> 894_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); 895 896template <class _Tp> 897_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v = __is_rvalue_reference(_Tp); 898#endif 899 900#else // __has_keyword(__is_lvalue_reference) && etc... 901 902template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 903template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 904 905template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 906template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 907 908template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 909template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 910template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {}; 911 912#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 913template <class _Tp> 914_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v 915 = is_reference<_Tp>::value; 916 917template <class _Tp> 918_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v 919 = is_lvalue_reference<_Tp>::value; 920 921template <class _Tp> 922_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v 923 = is_rvalue_reference<_Tp>::value; 924#endif 925 926#endif // __has_keyword(__is_lvalue_reference) && etc... 927 928// is_union 929 930#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 931 932template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 933 : public integral_constant<bool, __is_union(_Tp)> {}; 934 935#else 936 937template <class _Tp> struct __libcpp_union : public false_type {}; 938template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 939 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 940 941#endif 942 943#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 944template <class _Tp> 945_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_union_v 946 = is_union<_Tp>::value; 947#endif 948 949// is_class 950 951#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 952 953template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 954 : public integral_constant<bool, __is_class(_Tp)> {}; 955 956#else 957 958namespace __is_class_imp 959{ 960template <class _Tp> char __test(int _Tp::*); 961template <class _Tp> __two __test(...); 962} 963 964template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 965 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 966 967#endif 968 969#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 970template <class _Tp> 971_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_class_v 972 = is_class<_Tp>::value; 973#endif 974 975// is_function 976 977template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 978 : public _BoolConstant< 979#ifdef __clang__ 980 __is_function(_Tp) 981#else 982 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 983#endif 984 > {}; 985 986 987#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 988template <class _Tp> 989_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_function_v 990 = is_function<_Tp>::value; 991#endif 992 993template <class _Tp> struct __libcpp_is_member_pointer { 994 enum { 995 __is_member = false, 996 __is_func = false, 997 __is_obj = false 998 }; 999}; 1000template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 1001 enum { 1002 __is_member = true, 1003 __is_func = is_function<_Tp>::value, 1004 __is_obj = !__is_func, 1005 }; 1006}; 1007 1008#if __has_keyword(__is_member_function_pointer) 1009 1010template<class _Tp> 1011struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 1012 : _BoolConstant<__is_member_function_pointer(_Tp)> { }; 1013 1014#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1015template <class _Tp> 1016_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 1017 = __is_member_function_pointer(_Tp); 1018#endif 1019 1020#else // __has_keyword(__is_member_function_pointer) 1021 1022template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 1023 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 1024 1025#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1026template <class _Tp> 1027_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 1028 = is_member_function_pointer<_Tp>::value; 1029#endif 1030 1031#endif // __has_keyword(__is_member_function_pointer) 1032 1033// is_member_pointer 1034 1035#if __has_keyword(__is_member_pointer) 1036 1037template<class _Tp> 1038struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { }; 1039 1040#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1041template <class _Tp> 1042_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v = __is_member_pointer(_Tp); 1043#endif 1044 1045#else // __has_keyword(__is_member_pointer) 1046 1047template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 1048 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 1049 1050#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1051template <class _Tp> 1052_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v 1053 = is_member_pointer<_Tp>::value; 1054#endif 1055 1056#endif // __has_keyword(__is_member_pointer) 1057 1058// is_member_object_pointer 1059 1060#if __has_keyword(__is_member_object_pointer) 1061 1062template<class _Tp> 1063struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1064 : _BoolConstant<__is_member_object_pointer(_Tp)> { }; 1065 1066#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1067template <class _Tp> 1068_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 1069 = __is_member_object_pointer(_Tp); 1070#endif 1071 1072#else // __has_keyword(__is_member_object_pointer) 1073 1074template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1075 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 1076 1077#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1078template <class _Tp> 1079_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 1080 = is_member_object_pointer<_Tp>::value; 1081#endif 1082 1083#endif // __has_keyword(__is_member_object_pointer) 1084 1085// is_enum 1086 1087#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1088 1089template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1090 : public integral_constant<bool, __is_enum(_Tp)> {}; 1091 1092#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1093template <class _Tp> 1094_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v = __is_enum(_Tp); 1095#endif 1096 1097#else 1098 1099template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1100 : public integral_constant<bool, !is_void<_Tp>::value && 1101 !is_integral<_Tp>::value && 1102 !is_floating_point<_Tp>::value && 1103 !is_array<_Tp>::value && 1104 !is_pointer<_Tp>::value && 1105 !is_reference<_Tp>::value && 1106 !is_member_pointer<_Tp>::value && 1107 !is_union<_Tp>::value && 1108 !is_class<_Tp>::value && 1109 !is_function<_Tp>::value > {}; 1110 1111#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1112template <class _Tp> 1113_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v 1114 = is_enum<_Tp>::value; 1115#endif 1116 1117#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1118 1119// is_arithmetic 1120 1121 1122template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 1123 : public integral_constant<bool, is_integral<_Tp>::value || 1124 is_floating_point<_Tp>::value> {}; 1125 1126#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1127template <class _Tp> 1128_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v 1129 = is_arithmetic<_Tp>::value; 1130#endif 1131 1132// is_fundamental 1133 1134// Before Clang 10, __is_fundamental didn't work for nullptr_t. 1135// In C++03 nullptr_t is library-provided but must still count as "fundamental." 1136#if __has_keyword(__is_fundamental) && \ 1137 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) && \ 1138 !defined(_LIBCPP_CXX03_LANG) 1139 1140template<class _Tp> 1141struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { }; 1142 1143#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1144template <class _Tp> 1145_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v = __is_fundamental(_Tp); 1146#endif 1147 1148#else // __has_keyword(__is_fundamental) 1149 1150template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 1151 : public integral_constant<bool, is_void<_Tp>::value || 1152 __is_nullptr_t<_Tp>::value || 1153 is_arithmetic<_Tp>::value> {}; 1154 1155#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1156template <class _Tp> 1157_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v 1158 = is_fundamental<_Tp>::value; 1159#endif 1160 1161#endif // __has_keyword(__is_fundamental) 1162 1163// is_scalar 1164 1165// In C++03 nullptr_t is library-provided but must still count as "scalar." 1166#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG) 1167 1168template<class _Tp> 1169struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { }; 1170 1171#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1172template <class _Tp> 1173_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v = __is_scalar(_Tp); 1174#endif 1175 1176#else // __has_keyword(__is_scalar) 1177 1178template <class _Tp> struct __is_block : false_type {}; 1179#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) 1180template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {}; 1181#endif 1182 1183template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1184 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1185 is_member_pointer<_Tp>::value || 1186 is_pointer<_Tp>::value || 1187 __is_nullptr_t<_Tp>::value || 1188 __is_block<_Tp>::value || 1189 is_enum<_Tp>::value > {}; 1190 1191template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1192 1193#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1194template <class _Tp> 1195_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v 1196 = is_scalar<_Tp>::value; 1197#endif 1198 1199#endif // __has_keyword(__is_scalar) 1200 1201// is_object 1202 1203#if __has_keyword(__is_object) 1204 1205template<class _Tp> 1206struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { }; 1207 1208#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1209template <class _Tp> 1210_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v = __is_object(_Tp); 1211#endif 1212 1213#else // __has_keyword(__is_object) 1214 1215template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1216 : public integral_constant<bool, is_scalar<_Tp>::value || 1217 is_array<_Tp>::value || 1218 is_union<_Tp>::value || 1219 is_class<_Tp>::value > {}; 1220 1221#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1222template <class _Tp> 1223_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v 1224 = is_object<_Tp>::value; 1225#endif 1226 1227#endif // __has_keyword(__is_object) 1228 1229// is_compound 1230 1231// >= 11 because in C++03 nullptr isn't actually nullptr 1232#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG) 1233 1234template<class _Tp> 1235struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { }; 1236 1237#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1238template <class _Tp> 1239_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v = __is_compound(_Tp); 1240#endif 1241 1242#else // __has_keyword(__is_compound) 1243 1244template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1245 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1246 1247#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1248template <class _Tp> 1249_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v 1250 = is_compound<_Tp>::value; 1251#endif 1252 1253#endif // __has_keyword(__is_compound) 1254 1255// __is_referenceable [defns.referenceable] 1256 1257struct __is_referenceable_impl { 1258 template <class _Tp> static _Tp& __test(int); 1259 template <class _Tp> static __two __test(...); 1260}; 1261 1262template <class _Tp> 1263struct __is_referenceable : integral_constant<bool, 1264 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1265 1266 1267// add_const 1268 1269template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1270 typedef _LIBCPP_NODEBUG_TYPE const _Tp type; 1271}; 1272 1273#if _LIBCPP_STD_VER > 11 1274template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1275#endif 1276 1277// add_volatile 1278 1279template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1280 typedef _LIBCPP_NODEBUG_TYPE volatile _Tp type; 1281}; 1282 1283#if _LIBCPP_STD_VER > 11 1284template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1285#endif 1286 1287// add_cv 1288template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1289 typedef _LIBCPP_NODEBUG_TYPE const volatile _Tp type; 1290}; 1291 1292#if _LIBCPP_STD_VER > 11 1293template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1294#endif 1295 1296// remove_reference 1297 1298#if __has_keyword(__remove_reference) 1299 1300template<class _Tp> 1301struct _LIBCPP_TEMPLATE_VIS remove_reference { typedef __remove_reference(_Tp) type; }; 1302 1303#else // __has_keyword(__remove_reference) 1304 1305template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1306template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1307template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1308 1309#if _LIBCPP_STD_VER > 11 1310template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1311#endif 1312 1313#endif // __has_keyword(__remove_reference) 1314 1315// add_lvalue_reference 1316 1317template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1318template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; }; 1319 1320template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1321{typedef _LIBCPP_NODEBUG_TYPE typename __add_lvalue_reference_impl<_Tp>::type type;}; 1322 1323#if _LIBCPP_STD_VER > 11 1324template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1325#endif 1326 1327template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1328template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp&& type; }; 1329 1330template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1331{typedef _LIBCPP_NODEBUG_TYPE typename __add_rvalue_reference_impl<_Tp>::type type;}; 1332 1333#if _LIBCPP_STD_VER > 11 1334template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1335#endif 1336 1337// Suppress deprecation notice for volatile-qualified return type resulting 1338// from volatile-qualified types _Tp. 1339_LIBCPP_SUPPRESS_DEPRECATED_PUSH 1340template <class _Tp> _Tp&& __declval(int); 1341template <class _Tp> _Tp __declval(long); 1342_LIBCPP_SUPPRESS_DEPRECATED_POP 1343 1344template <class _Tp> 1345decltype(_VSTD::__declval<_Tp>(0)) 1346declval() _NOEXCEPT; 1347 1348// __uncvref 1349 1350template <class _Tp> 1351struct __uncvref { 1352 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<typename remove_reference<_Tp>::type>::type type; 1353}; 1354 1355template <class _Tp> 1356struct __unconstref { 1357 typedef _LIBCPP_NODEBUG_TYPE typename remove_const<typename remove_reference<_Tp>::type>::type type; 1358}; 1359 1360#ifndef _LIBCPP_CXX03_LANG 1361template <class _Tp> 1362using __uncvref_t _LIBCPP_NODEBUG_TYPE = typename __uncvref<_Tp>::type; 1363#endif 1364 1365// __is_same_uncvref 1366 1367template <class _Tp, class _Up> 1368struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type, 1369 typename __uncvref<_Up>::type> {}; 1370 1371#if _LIBCPP_STD_VER > 17 1372// remove_cvref - same as __uncvref 1373template <class _Tp> 1374struct remove_cvref : public __uncvref<_Tp> {}; 1375 1376template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1377#endif 1378 1379 1380struct __any 1381{ 1382 __any(...); 1383}; 1384 1385// remove_pointer 1386 1387template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1388template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1389template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1390template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1391template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1392 1393#if _LIBCPP_STD_VER > 11 1394template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1395#endif 1396 1397// add_pointer 1398 1399template <class _Tp, 1400 bool = __is_referenceable<_Tp>::value || 1401 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1402struct __add_pointer_impl 1403 {typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type* type;}; 1404template <class _Tp> struct __add_pointer_impl<_Tp, false> 1405 {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1406 1407template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1408 {typedef _LIBCPP_NODEBUG_TYPE typename __add_pointer_impl<_Tp>::type type;}; 1409 1410#if _LIBCPP_STD_VER > 11 1411template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1412#endif 1413 1414// type_identity 1415#if _LIBCPP_STD_VER > 17 1416template<class _Tp> struct type_identity { typedef _Tp type; }; 1417template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1418#endif 1419 1420// is_signed 1421 1422// Before Clang 10, __is_signed didn't work for floating-point types or enums. 1423#if __has_keyword(__is_signed) && \ 1424 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) 1425 1426template<class _Tp> 1427struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { }; 1428 1429#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1430template <class _Tp> 1431_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v = __is_signed(_Tp); 1432#endif 1433 1434#else // __has_keyword(__is_signed) 1435 1436template <class _Tp, bool = is_integral<_Tp>::value> 1437struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {}; 1438 1439template <class _Tp> 1440struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1441 1442template <class _Tp, bool = is_arithmetic<_Tp>::value> 1443struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1444 1445template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1446 1447template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1448 1449#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1450template <class _Tp> 1451_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v 1452 = is_signed<_Tp>::value; 1453#endif 1454 1455#endif // __has_keyword(__is_signed) 1456 1457// is_unsigned 1458 1459// Before Clang 13, __is_unsigned returned true for enums with signed underlying type. 1460// No currently-released version of AppleClang contains the fixed intrinsic. 1461#if __has_keyword(__is_unsigned) && \ 1462 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1300) && \ 1463 !defined(_LIBCPP_APPLE_CLANG_VER) 1464 1465template<class _Tp> 1466struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { }; 1467 1468#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1469template <class _Tp> 1470_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v = __is_unsigned(_Tp); 1471#endif 1472 1473#else // __has_keyword(__is_unsigned) 1474 1475template <class _Tp, bool = is_integral<_Tp>::value> 1476struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {}; 1477 1478template <class _Tp> 1479struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1480 1481template <class _Tp, bool = is_arithmetic<_Tp>::value> 1482struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1483 1484template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1485 1486template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {}; 1487 1488#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1489template <class _Tp> 1490_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v 1491 = is_unsigned<_Tp>::value; 1492#endif 1493 1494#endif // __has_keyword(__is_unsigned) 1495 1496// rank 1497 1498template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1499 : public integral_constant<size_t, 0> {}; 1500template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1501 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1502template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1503 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1504 1505#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1506template <class _Tp> 1507_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t rank_v 1508 = rank<_Tp>::value; 1509#endif 1510 1511// extent 1512 1513#if __has_keyword(__array_extent) 1514 1515template<class _Tp, size_t _Dim = 0> 1516struct _LIBCPP_TEMPLATE_VIS extent 1517 : integral_constant<size_t, __array_extent(_Tp, _Dim)> { }; 1518 1519#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1520template <class _Tp, unsigned _Ip = 0> 1521_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v = __array_extent(_Tp, _Ip); 1522#endif 1523 1524#else // __has_keyword(__array_extent) 1525 1526template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1527 : public integral_constant<size_t, 0> {}; 1528template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1529 : public integral_constant<size_t, 0> {}; 1530template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1531 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1532template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1533 : public integral_constant<size_t, _Np> {}; 1534template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1535 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1536 1537#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1538template <class _Tp, unsigned _Ip = 0> 1539_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v 1540 = extent<_Tp, _Ip>::value; 1541#endif 1542 1543#endif // __has_keyword(__array_extent) 1544 1545// remove_extent 1546 1547template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1548 {typedef _Tp type;}; 1549template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1550 {typedef _Tp type;}; 1551template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1552 {typedef _Tp type;}; 1553 1554#if _LIBCPP_STD_VER > 11 1555template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1556#endif 1557 1558// remove_all_extents 1559 1560template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1561 {typedef _Tp type;}; 1562template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1563 {typedef typename remove_all_extents<_Tp>::type type;}; 1564template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1565 {typedef typename remove_all_extents<_Tp>::type type;}; 1566 1567#if _LIBCPP_STD_VER > 11 1568template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1569#endif 1570 1571#if _LIBCPP_STD_VER > 17 1572// is_bounded_array 1573 1574template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1575template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1576 1577template <class _Tp> 1578_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1579bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1580 1581// is_unbounded_array 1582 1583template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1584template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1585 1586template <class _Tp> 1587_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1588bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1589#endif 1590 1591// decay 1592 1593template <class _Up, bool> 1594struct __decay { 1595 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<_Up>::type type; 1596}; 1597 1598template <class _Up> 1599struct __decay<_Up, true> { 1600public: 1601 typedef _LIBCPP_NODEBUG_TYPE typename conditional 1602 < 1603 is_array<_Up>::value, 1604 typename remove_extent<_Up>::type*, 1605 typename conditional 1606 < 1607 is_function<_Up>::value, 1608 typename add_pointer<_Up>::type, 1609 typename remove_cv<_Up>::type 1610 >::type 1611 >::type type; 1612}; 1613 1614template <class _Tp> 1615struct _LIBCPP_TEMPLATE_VIS decay 1616{ 1617private: 1618 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 1619public: 1620 typedef _LIBCPP_NODEBUG_TYPE typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1621}; 1622 1623#if _LIBCPP_STD_VER > 11 1624template <class _Tp> using decay_t = typename decay<_Tp>::type; 1625#endif 1626 1627// is_abstract 1628 1629template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1630 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1631 1632#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1633template <class _Tp> 1634_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_abstract_v 1635 = is_abstract<_Tp>::value; 1636#endif 1637 1638// is_final 1639 1640template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1641__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1642 1643#if _LIBCPP_STD_VER > 11 1644template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1645is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1646#endif 1647 1648#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1649template <class _Tp> 1650_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_final_v 1651 = is_final<_Tp>::value; 1652#endif 1653 1654// is_aggregate 1655#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1656 1657template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1658is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1659 1660#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1661template <class _Tp> 1662_LIBCPP_INLINE_VAR constexpr bool is_aggregate_v 1663 = is_aggregate<_Tp>::value; 1664#endif 1665 1666#endif // _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1667 1668// is_base_of 1669 1670template <class _Bp, class _Dp> 1671struct _LIBCPP_TEMPLATE_VIS is_base_of 1672 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1673 1674#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1675template <class _Bp, class _Dp> 1676_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_base_of_v 1677 = is_base_of<_Bp, _Dp>::value; 1678#endif 1679 1680// __is_core_convertible 1681 1682// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed. 1683// We can't test for that, but we can test implicit convertibility by passing it 1684// to a function. Notice that __is_core_convertible<void,void> is false, 1685// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later. 1686 1687template <class _Tp, class _Up, class = void> 1688struct __is_core_convertible : public false_type {}; 1689 1690template <class _Tp, class _Up> 1691struct __is_core_convertible<_Tp, _Up, decltype( 1692 static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() ) 1693)> : public true_type {}; 1694 1695// is_convertible 1696 1697#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1698 1699template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1700 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 1701 1702#else // __has_feature(is_convertible_to) 1703 1704namespace __is_convertible_imp 1705{ 1706template <class _Tp> void __test_convert(_Tp); 1707 1708template <class _From, class _To, class = void> 1709struct __is_convertible_test : public false_type {}; 1710 1711template <class _From, class _To> 1712struct __is_convertible_test<_From, _To, 1713 decltype(_VSTD::__is_convertible_imp::__test_convert<_To>(_VSTD::declval<_From>()))> : public true_type 1714{}; 1715 1716template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1717 bool _IsFunction = is_function<_Tp>::value, 1718 bool _IsVoid = is_void<_Tp>::value> 1719 struct __is_array_function_or_void {enum {value = 0};}; 1720template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1721template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1722template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1723} 1724 1725template <class _Tp, 1726 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1727struct __is_convertible_check 1728{ 1729 static const size_t __v = 0; 1730}; 1731 1732template <class _Tp> 1733struct __is_convertible_check<_Tp, 0> 1734{ 1735 static const size_t __v = sizeof(_Tp); 1736}; 1737 1738template <class _T1, class _T2, 1739 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1740 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1741struct __is_convertible 1742 : public integral_constant<bool, 1743 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1744 > 1745{}; 1746 1747template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1748template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1749template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1750template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1751 1752template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1753template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1754template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1755template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1756 1757template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1758template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1759template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1760template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1761 1762template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1763 : public __is_convertible<_T1, _T2> 1764{ 1765 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1766 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1767}; 1768 1769#endif // __has_feature(is_convertible_to) 1770 1771#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1772template <class _From, class _To> 1773_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_convertible_v 1774 = is_convertible<_From, _To>::value; 1775#endif 1776 1777// is_nothrow_convertible 1778 1779#if _LIBCPP_STD_VER > 17 1780 1781template <typename _Tp> 1782static void __test_noexcept(_Tp) noexcept; 1783 1784template<typename _Fm, typename _To> 1785static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 1786__is_nothrow_convertible_test(); 1787 1788template <typename _Fm, typename _To> 1789struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1790{ }; 1791 1792template <typename _Fm, typename _To> 1793struct is_nothrow_convertible : _Or< 1794 _And<is_void<_To>, is_void<_Fm>>, 1795 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1796>::type { }; 1797 1798template <typename _Fm, typename _To> 1799inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1800 1801#endif // _LIBCPP_STD_VER > 17 1802 1803// is_empty 1804 1805#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1806 1807template <class _Tp> 1808struct _LIBCPP_TEMPLATE_VIS is_empty 1809 : public integral_constant<bool, __is_empty(_Tp)> {}; 1810 1811#else // __has_feature(is_empty) 1812 1813template <class _Tp> 1814struct __is_empty1 1815 : public _Tp 1816{ 1817 double __lx; 1818}; 1819 1820struct __is_empty2 1821{ 1822 double __lx; 1823}; 1824 1825template <class _Tp, bool = is_class<_Tp>::value> 1826struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1827 1828template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1829 1830template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1831 1832#endif // __has_feature(is_empty) 1833 1834#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1835template <class _Tp> 1836_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_empty_v 1837 = is_empty<_Tp>::value; 1838#endif 1839 1840// is_polymorphic 1841 1842#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1843 1844template <class _Tp> 1845struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1846 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1847 1848#else 1849 1850template<typename _Tp> char &__is_polymorphic_impl( 1851 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1852 int>::type); 1853template<typename _Tp> __two &__is_polymorphic_impl(...); 1854 1855template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1856 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1857 1858#endif // __has_feature(is_polymorphic) 1859 1860#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1861template <class _Tp> 1862_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_polymorphic_v 1863 = is_polymorphic<_Tp>::value; 1864#endif 1865 1866// has_virtual_destructor 1867 1868#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1869 1870template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1871 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1872 1873#else 1874 1875template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1876 : public false_type {}; 1877 1878#endif 1879 1880#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1881template <class _Tp> 1882_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_virtual_destructor_v 1883 = has_virtual_destructor<_Tp>::value; 1884#endif 1885 1886// has_unique_object_representations 1887 1888#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS) 1889 1890template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1891 : public integral_constant<bool, 1892 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1893 1894#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1895template <class _Tp> 1896_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_unique_object_representations_v 1897 = has_unique_object_representations<_Tp>::value; 1898#endif 1899 1900#endif 1901 1902// alignment_of 1903 1904template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1905 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1906 1907#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1908template <class _Tp> 1909_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t alignment_of_v 1910 = alignment_of<_Tp>::value; 1911#endif 1912 1913// aligned_storage 1914 1915template <class _Hp, class _Tp> 1916struct __type_list 1917{ 1918 typedef _Hp _Head; 1919 typedef _Tp _Tail; 1920}; 1921 1922struct __nat 1923{ 1924#ifndef _LIBCPP_CXX03_LANG 1925 __nat() = delete; 1926 __nat(const __nat&) = delete; 1927 __nat& operator=(const __nat&) = delete; 1928 ~__nat() = delete; 1929#endif 1930}; 1931 1932template <class _Tp> 1933struct __align_type 1934{ 1935 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1936 typedef _Tp type; 1937}; 1938 1939struct __struct_double {long double __lx;}; 1940struct __struct_double4 {double __lx[4];}; 1941 1942typedef 1943 __type_list<__align_type<unsigned char>, 1944 __type_list<__align_type<unsigned short>, 1945 __type_list<__align_type<unsigned int>, 1946 __type_list<__align_type<unsigned long>, 1947 __type_list<__align_type<unsigned long long>, 1948 __type_list<__align_type<double>, 1949 __type_list<__align_type<long double>, 1950 __type_list<__align_type<__struct_double>, 1951 __type_list<__align_type<__struct_double4>, 1952 __type_list<__align_type<int*>, 1953 __nat 1954 > > > > > > > > > > __all_types; 1955 1956template <size_t _Align> 1957struct _ALIGNAS(_Align) __fallback_overaligned {}; 1958 1959template <class _TL, size_t _Align> struct __find_pod; 1960 1961template <class _Hp, size_t _Align> 1962struct __find_pod<__type_list<_Hp, __nat>, _Align> 1963{ 1964 typedef typename conditional< 1965 _Align == _Hp::value, 1966 typename _Hp::type, 1967 __fallback_overaligned<_Align> 1968 >::type type; 1969}; 1970 1971template <class _Hp, class _Tp, size_t _Align> 1972struct __find_pod<__type_list<_Hp, _Tp>, _Align> 1973{ 1974 typedef typename conditional< 1975 _Align == _Hp::value, 1976 typename _Hp::type, 1977 typename __find_pod<_Tp, _Align>::type 1978 >::type type; 1979}; 1980 1981template <class _TL, size_t _Len> struct __find_max_align; 1982 1983template <class _Hp, size_t _Len> 1984struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 1985 1986template <size_t _Len, size_t _A1, size_t _A2> 1987struct __select_align 1988{ 1989private: 1990 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 1991 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 1992public: 1993 static const size_t value = _Len < __max ? __min : __max; 1994}; 1995 1996template <class _Hp, class _Tp, size_t _Len> 1997struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 1998 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 1999 2000template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 2001struct _LIBCPP_TEMPLATE_VIS aligned_storage 2002{ 2003 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 2004 union type 2005 { 2006 _Aligner __align; 2007 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 2008 }; 2009}; 2010 2011#if _LIBCPP_STD_VER > 11 2012template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 2013 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 2014#endif 2015 2016#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 2017template <size_t _Len>\ 2018struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 2019{\ 2020 struct _ALIGNAS(n) type\ 2021 {\ 2022 unsigned char __lx[(_Len + n - 1)/n * n];\ 2023 };\ 2024} 2025 2026_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 2027_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 2028_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 2029_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 2030_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 2031_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 2032_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 2033_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 2034_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 2035_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 2036_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 2037_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 2038_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 2039_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 2040// PE/COFF does not support alignment beyond 8192 (=0x2000) 2041#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 2042_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 2043#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 2044 2045#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 2046 2047 2048// aligned_union 2049 2050template <size_t _I0, size_t ..._In> 2051struct __static_max; 2052 2053template <size_t _I0> 2054struct __static_max<_I0> 2055{ 2056 static const size_t value = _I0; 2057}; 2058 2059template <size_t _I0, size_t _I1, size_t ..._In> 2060struct __static_max<_I0, _I1, _In...> 2061{ 2062 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 2063 __static_max<_I1, _In...>::value; 2064}; 2065 2066template <size_t _Len, class _Type0, class ..._Types> 2067struct aligned_union 2068{ 2069 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 2070 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 2071 static const size_t __len = __static_max<_Len, sizeof(_Type0), 2072 sizeof(_Types)...>::value; 2073 typedef typename aligned_storage<__len, alignment_value>::type type; 2074}; 2075 2076#if _LIBCPP_STD_VER > 11 2077template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 2078#endif 2079 2080template <class _Tp> 2081struct __numeric_type 2082{ 2083 static void __test(...); 2084 static float __test(float); 2085 static double __test(char); 2086 static double __test(int); 2087 static double __test(unsigned); 2088 static double __test(long); 2089 static double __test(unsigned long); 2090 static double __test(long long); 2091 static double __test(unsigned long long); 2092 static double __test(double); 2093 static long double __test(long double); 2094 2095 typedef decltype(__test(declval<_Tp>())) type; 2096 static const bool value = _IsNotSame<type, void>::value; 2097}; 2098 2099template <> 2100struct __numeric_type<void> 2101{ 2102 static const bool value = true; 2103}; 2104 2105// __promote 2106 2107template <class _A1, class _A2 = void, class _A3 = void, 2108 bool = __numeric_type<_A1>::value && 2109 __numeric_type<_A2>::value && 2110 __numeric_type<_A3>::value> 2111class __promote_imp 2112{ 2113public: 2114 static const bool value = false; 2115}; 2116 2117template <class _A1, class _A2, class _A3> 2118class __promote_imp<_A1, _A2, _A3, true> 2119{ 2120private: 2121 typedef typename __promote_imp<_A1>::type __type1; 2122 typedef typename __promote_imp<_A2>::type __type2; 2123 typedef typename __promote_imp<_A3>::type __type3; 2124public: 2125 typedef decltype(__type1() + __type2() + __type3()) type; 2126 static const bool value = true; 2127}; 2128 2129template <class _A1, class _A2> 2130class __promote_imp<_A1, _A2, void, true> 2131{ 2132private: 2133 typedef typename __promote_imp<_A1>::type __type1; 2134 typedef typename __promote_imp<_A2>::type __type2; 2135public: 2136 typedef decltype(__type1() + __type2()) type; 2137 static const bool value = true; 2138}; 2139 2140template <class _A1> 2141class __promote_imp<_A1, void, void, true> 2142{ 2143public: 2144 typedef typename __numeric_type<_A1>::type type; 2145 static const bool value = true; 2146}; 2147 2148template <class _A1, class _A2 = void, class _A3 = void> 2149class __promote : public __promote_imp<_A1, _A2, _A3> {}; 2150 2151// make_signed / make_unsigned 2152 2153typedef 2154 __type_list<signed char, 2155 __type_list<signed short, 2156 __type_list<signed int, 2157 __type_list<signed long, 2158 __type_list<signed long long, 2159#ifndef _LIBCPP_HAS_NO_INT128 2160 __type_list<__int128_t, 2161#endif 2162 __nat 2163#ifndef _LIBCPP_HAS_NO_INT128 2164 > 2165#endif 2166 > > > > > __signed_types; 2167 2168typedef 2169 __type_list<unsigned char, 2170 __type_list<unsigned short, 2171 __type_list<unsigned int, 2172 __type_list<unsigned long, 2173 __type_list<unsigned long long, 2174#ifndef _LIBCPP_HAS_NO_INT128 2175 __type_list<__uint128_t, 2176#endif 2177 __nat 2178#ifndef _LIBCPP_HAS_NO_INT128 2179 > 2180#endif 2181 > > > > > __unsigned_types; 2182 2183template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 2184 2185template <class _Hp, class _Tp, size_t _Size> 2186struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 2187{ 2188 typedef _LIBCPP_NODEBUG_TYPE _Hp type; 2189}; 2190 2191template <class _Hp, class _Tp, size_t _Size> 2192struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 2193{ 2194 typedef _LIBCPP_NODEBUG_TYPE typename __find_first<_Tp, _Size>::type type; 2195}; 2196 2197template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 2198 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 2199struct __apply_cv 2200{ 2201 typedef _LIBCPP_NODEBUG_TYPE _Up type; 2202}; 2203 2204template <class _Tp, class _Up> 2205struct __apply_cv<_Tp, _Up, true, false> 2206{ 2207 typedef _LIBCPP_NODEBUG_TYPE const _Up type; 2208}; 2209 2210template <class _Tp, class _Up> 2211struct __apply_cv<_Tp, _Up, false, true> 2212{ 2213 typedef volatile _Up type; 2214}; 2215 2216template <class _Tp, class _Up> 2217struct __apply_cv<_Tp, _Up, true, true> 2218{ 2219 typedef const volatile _Up type; 2220}; 2221 2222template <class _Tp, class _Up> 2223struct __apply_cv<_Tp&, _Up, false, false> 2224{ 2225 typedef _Up& type; 2226}; 2227 2228template <class _Tp, class _Up> 2229struct __apply_cv<_Tp&, _Up, true, false> 2230{ 2231 typedef const _Up& type; 2232}; 2233 2234template <class _Tp, class _Up> 2235struct __apply_cv<_Tp&, _Up, false, true> 2236{ 2237 typedef volatile _Up& type; 2238}; 2239 2240template <class _Tp, class _Up> 2241struct __apply_cv<_Tp&, _Up, true, true> 2242{ 2243 typedef const volatile _Up& type; 2244}; 2245 2246template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2247struct __make_signed {}; 2248 2249template <class _Tp> 2250struct __make_signed<_Tp, true> 2251{ 2252 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 2253}; 2254 2255template <> struct __make_signed<bool, true> {}; 2256template <> struct __make_signed< signed short, true> {typedef short type;}; 2257template <> struct __make_signed<unsigned short, true> {typedef short type;}; 2258template <> struct __make_signed< signed int, true> {typedef int type;}; 2259template <> struct __make_signed<unsigned int, true> {typedef int type;}; 2260template <> struct __make_signed< signed long, true> {typedef long type;}; 2261template <> struct __make_signed<unsigned long, true> {typedef long type;}; 2262template <> struct __make_signed< signed long long, true> {typedef long long type;}; 2263template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 2264#ifndef _LIBCPP_HAS_NO_INT128 2265template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 2266template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 2267#endif 2268 2269template <class _Tp> 2270struct _LIBCPP_TEMPLATE_VIS make_signed 2271{ 2272 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 2273}; 2274 2275#if _LIBCPP_STD_VER > 11 2276template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 2277#endif 2278 2279template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2280struct __make_unsigned {}; 2281 2282template <class _Tp> 2283struct __make_unsigned<_Tp, true> 2284{ 2285 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2286}; 2287 2288template <> struct __make_unsigned<bool, true> {}; 2289template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2290template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2291template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2292template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2293template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2294template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2295template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2296template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2297#ifndef _LIBCPP_HAS_NO_INT128 2298template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2299template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2300#endif 2301 2302template <class _Tp> 2303struct _LIBCPP_TEMPLATE_VIS make_unsigned 2304{ 2305 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2306}; 2307 2308#if _LIBCPP_STD_VER > 11 2309template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2310#endif 2311 2312#if _LIBCPP_STD_VER > 14 2313template <class...> using void_t = void; 2314#endif 2315 2316#if _LIBCPP_STD_VER > 17 2317// Let COND_RES(X, Y) be: 2318template <class _Tp, class _Up> 2319using __cond_type = decltype(false ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>()); 2320 2321template <class _Tp, class _Up, class = void> 2322struct __common_type3 {}; 2323 2324// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 2325template <class _Tp, class _Up> 2326struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 2327{ 2328 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 2329}; 2330 2331template <class _Tp, class _Up, class = void> 2332struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 2333#else 2334template <class _Tp, class _Up, class = void> 2335struct __common_type2_imp {}; 2336#endif 2337 2338// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 2339template <class _Tp, class _Up> 2340struct __common_type2_imp<_Tp, _Up, 2341 typename __void_t<decltype( 2342 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2343 )>::type> 2344{ 2345 typedef _LIBCPP_NODEBUG_TYPE typename decay<decltype( 2346 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2347 )>::type type; 2348}; 2349 2350template <class, class = void> 2351struct __common_type_impl {}; 2352 2353// Clang provides variadic templates in C++03 as an extension. 2354#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2355# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2356template <class... Tp> 2357struct __common_types; 2358template <class... _Tp> 2359struct _LIBCPP_TEMPLATE_VIS common_type; 2360#else 2361# define _LIBCPP_OPTIONAL_PACK(...) 2362struct __no_arg; 2363template <class _Tp, class _Up, class = __no_arg> 2364struct __common_types; 2365template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2366 class _Unused = __no_arg> 2367struct common_type { 2368 static_assert(sizeof(_Unused) == 0, 2369 "common_type accepts at most 3 arguments in C++03"); 2370}; 2371#endif // _LIBCPP_CXX03_LANG 2372 2373template <class _Tp, class _Up> 2374struct __common_type_impl< 2375 __common_types<_Tp, _Up>, 2376 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2377{ 2378 typedef typename common_type<_Tp, _Up>::type type; 2379}; 2380 2381template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2382struct __common_type_impl< 2383 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2384 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2385 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2386 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2387}; 2388 2389// bullet 1 - sizeof...(Tp) == 0 2390 2391template <> 2392struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2393 2394// bullet 2 - sizeof...(Tp) == 1 2395 2396template <class _Tp> 2397struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2398 : public common_type<_Tp, _Tp> {}; 2399 2400// bullet 3 - sizeof...(Tp) == 2 2401 2402// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 2403template <class _Tp, class _Up> 2404struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2405 : conditional< 2406 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2407 __common_type2_imp<_Tp, _Up>, 2408 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2409 >::type 2410{}; 2411 2412// bullet 4 - sizeof...(Tp) > 2 2413 2414template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2415struct _LIBCPP_TEMPLATE_VIS 2416 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2417 : __common_type_impl< 2418 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2419 2420#undef _LIBCPP_OPTIONAL_PACK 2421 2422#if _LIBCPP_STD_VER > 11 2423template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2424#endif 2425 2426#if _LIBCPP_STD_VER > 11 2427// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM’s 2428// top-level cv-qualifiers. 2429template <class _From, class _To> 2430struct __copy_cv 2431{ 2432 using type = _To; 2433}; 2434 2435template <class _From, class _To> 2436struct __copy_cv<const _From, _To> 2437{ 2438 using type = add_const_t<_To>; 2439}; 2440 2441template <class _From, class _To> 2442struct __copy_cv<volatile _From, _To> 2443{ 2444 using type = add_volatile_t<_To>; 2445}; 2446 2447template <class _From, class _To> 2448struct __copy_cv<const volatile _From, _To> 2449{ 2450 using type = add_cv_t<_To>; 2451}; 2452 2453template <class _From, class _To> 2454using __copy_cv_t = typename __copy_cv<_From, _To>::type; 2455 2456template <class _From, class _To> 2457struct __copy_cvref 2458{ 2459 using type = __copy_cv_t<_From, _To>; 2460}; 2461 2462template <class _From, class _To> 2463struct __copy_cvref<_From&, _To> 2464{ 2465 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 2466}; 2467 2468template <class _From, class _To> 2469struct __copy_cvref<_From&&, _To> 2470{ 2471 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 2472}; 2473 2474template <class _From, class _To> 2475using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 2476 2477#endif // _LIBCPP_STD_VER > 11 2478 2479// common_reference 2480#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 2481// Let COND_RES(X, Y) be: 2482template <class _Xp, class _Yp> 2483using __cond_res = 2484 decltype(false ? _VSTD::declval<_Xp(&)()>()() : _VSTD::declval<_Yp(&)()>()()); 2485 2486// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 2487// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 2488// `U`. 2489// [Note: `XREF(A)` is `__xref<A>::template __apply`] 2490template <class _Tp> 2491struct __xref { 2492 template<class _Up> 2493 using __apply = __copy_cvref_t<_Tp, _Up>; 2494}; 2495 2496// Given types `A` and `B`, let `X` be `remove_reference_t<A>`, let `Y` be `remove_reference_t<B>`, 2497// and let `COMMON-REF(A, B)` be: 2498template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 2499struct __common_ref; 2500 2501template<class _Xp, class _Yp> 2502using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 2503 2504template<class _Xp, class _Yp> 2505using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 2506 2507 2508// If `A` and `B` are both lvalue reference types, `COMMON-REF(A, B)` is 2509// `COND-RES(COPYCV(X, Y) &, COPYCV(Y, X) &)` if that type exists and is a reference type. 2510template<class _Ap, class _Bp, class _Xp, class _Yp> 2511requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 2512struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 2513{ 2514 using __type = __cv_cond_res<_Xp, _Yp>; 2515}; 2516 2517// Otherwise, let `C` be `remove_reference_t<COMMON-REF(X&, Y&)>&&`.... 2518template <class _Xp, class _Yp> 2519using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 2520 2521 2522// .... If `A` and `B` are both rvalue reference types, `C` is well-formed, and 2523// `is_convertible_v<A, C> && is_convertible_v<B, C>` is `true`, then `COMMON-REF(A, B)` is `C`. 2524template<class _Ap, class _Bp, class _Xp, class _Yp> 2525requires 2526 requires { typename __common_ref_C<_Xp, _Yp>; } && 2527 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 2528 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 2529struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 2530{ 2531 using __type = __common_ref_C<_Xp, _Yp>; 2532}; 2533 2534// Otherwise, let `D` be `COMMON-REF(const X&, Y&)`.... 2535template <class _Tp, class _Up> 2536using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 2537 2538// ... If `A` is an rvalue reference and `B` is an lvalue reference and `D` is well-formed and 2539// `is_convertible_v<A, D>` is `true`, then `COMMON-REF(A, B)` is `D`. 2540template<class _Ap, class _Bp, class _Xp, class _Yp> 2541requires requires { typename __common_ref_D<_Xp, _Yp>; } && 2542 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 2543struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 2544{ 2545 using __type = __common_ref_D<_Xp, _Yp>; 2546}; 2547 2548// Otherwise, if `A` is an lvalue reference and `B` is an rvalue reference, then 2549// `COMMON-REF(A, B)` is `COMMON-REF(B, A)`. 2550template<class _Ap, class _Bp, class _Xp, class _Yp> 2551struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 2552 2553// Otherwise, `COMMON-REF(A, B)` is ill-formed. 2554template<class _Ap, class _Bp, class _Xp, class _Yp> 2555struct __common_ref {}; 2556 2557// Note C: For the common_reference trait applied to a parameter pack [...] 2558 2559template <class...> 2560struct common_reference; 2561 2562template <class... _Types> 2563using common_reference_t = typename common_reference<_Types...>::type; 2564 2565// bullet 1 - sizeof...(T) == 0 2566template<> 2567struct common_reference<> {}; 2568 2569// bullet 2 - sizeof...(T) == 1 2570template <class _Tp> 2571struct common_reference<_Tp> 2572{ 2573 using type = _Tp; 2574}; 2575 2576// bullet 3 - sizeof...(T) == 2 2577template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 2578template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 2579template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 2580 2581// sub-bullet 1 - If `T1` and `T2` are reference types and `COMMON-REF(T1, T2)` is well-formed, then 2582// the member typedef type denotes that type. 2583template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 2584 2585template <class _Tp, class _Up> 2586requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 2587struct __common_reference_sub_bullet1<_Tp, _Up> 2588{ 2589 using type = __common_ref_t<_Tp, _Up>; 2590}; 2591 2592// sub-bullet 2 - Otherwise, if `basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type` 2593// is well-formed, then the member typedef type denotes that type. 2594template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 2595 2596template <class _Tp, class _Up> 2597using __basic_common_reference_t = typename basic_common_reference< 2598 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 2599 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 2600 2601template <class _Tp, class _Up> 2602requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 2603struct __common_reference_sub_bullet2<_Tp, _Up> 2604{ 2605 using type = __basic_common_reference_t<_Tp, _Up>; 2606}; 2607 2608// sub-bullet 3 - Otherwise, if `COND-RES(T1, T2)` is well-formed, then the member typedef type 2609// denotes that type. 2610template <class _Tp, class _Up> 2611requires requires { typename __cond_res<_Tp, _Up>; } 2612struct __common_reference_sub_bullet3<_Tp, _Up> 2613{ 2614 using type = __cond_res<_Tp, _Up>; 2615}; 2616 2617 2618// sub-bullet 4 & 5 - Otherwise, if `common_type_t<T1, T2>` is well-formed, then the member typedef 2619// type denotes that type. 2620// - Otherwise, there shall be no member type. 2621template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 2622 2623// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 2624// any, as `common_reference_t<C, Rest...>`. 2625template <class _Tp, class _Up, class _Vp, class... _Rest> 2626requires requires { typename common_reference_t<_Tp, _Up>; } 2627struct common_reference<_Tp, _Up, _Vp, _Rest...> 2628 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 2629{}; 2630 2631// bullet 5 - Otherwise, there shall be no member type. 2632template <class...> struct common_reference {}; 2633 2634#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 2635 2636// is_assignable 2637 2638template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 2639 2640#if __has_keyword(__is_assignable) 2641 2642template<class _Tp, class _Up> 2643struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { }; 2644 2645#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2646template <class _Tp, class _Arg> 2647_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v = __is_assignable(_Tp, _Arg); 2648#endif 2649 2650#else // __has_keyword(__is_assignable) 2651 2652template <class _Tp, class _Arg> 2653typename __select_2nd<decltype((_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>())), true_type>::type 2654__is_assignable_test(int); 2655 2656template <class, class> 2657false_type __is_assignable_test(...); 2658 2659 2660template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2661struct __is_assignable_imp 2662 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2663 2664template <class _Tp, class _Arg> 2665struct __is_assignable_imp<_Tp, _Arg, true> 2666 : public false_type 2667{ 2668}; 2669 2670template <class _Tp, class _Arg> 2671struct is_assignable 2672 : public __is_assignable_imp<_Tp, _Arg> {}; 2673 2674#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2675template <class _Tp, class _Arg> 2676_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v 2677 = is_assignable<_Tp, _Arg>::value; 2678#endif 2679 2680#endif // __has_keyword(__is_assignable) 2681 2682// is_copy_assignable 2683 2684template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2685 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2686 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2687 2688#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2689template <class _Tp> 2690_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_assignable_v 2691 = is_copy_assignable<_Tp>::value; 2692#endif 2693 2694// is_move_assignable 2695 2696template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2697 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2698 typename add_rvalue_reference<_Tp>::type> {}; 2699 2700#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2701template <class _Tp> 2702_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_assignable_v 2703 = is_move_assignable<_Tp>::value; 2704#endif 2705 2706// is_destructible 2707 2708#if __has_keyword(__is_destructible) 2709 2710template<class _Tp> 2711struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 2712 2713#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2714template <class _Tp> 2715_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v = __is_destructible(_Tp); 2716#endif 2717 2718#else // __has_keyword(__is_destructible) 2719 2720// if it's a reference, return true 2721// if it's a function, return false 2722// if it's void, return false 2723// if it's an array of unknown bound, return false 2724// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 2725// where _Up is remove_all_extents<_Tp>::type 2726 2727template <class> 2728struct __is_destructible_apply { typedef int type; }; 2729 2730template <typename _Tp> 2731struct __is_destructor_wellformed { 2732 template <typename _Tp1> 2733 static char __test ( 2734 typename __is_destructible_apply<decltype(_VSTD::declval<_Tp1&>().~_Tp1())>::type 2735 ); 2736 2737 template <typename _Tp1> 2738 static __two __test (...); 2739 2740 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2741}; 2742 2743template <class _Tp, bool> 2744struct __destructible_imp; 2745 2746template <class _Tp> 2747struct __destructible_imp<_Tp, false> 2748 : public _VSTD::integral_constant<bool, 2749 __is_destructor_wellformed<typename _VSTD::remove_all_extents<_Tp>::type>::value> {}; 2750 2751template <class _Tp> 2752struct __destructible_imp<_Tp, true> 2753 : public _VSTD::true_type {}; 2754 2755template <class _Tp, bool> 2756struct __destructible_false; 2757 2758template <class _Tp> 2759struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, _VSTD::is_reference<_Tp>::value> {}; 2760 2761template <class _Tp> 2762struct __destructible_false<_Tp, true> : public _VSTD::false_type {}; 2763 2764template <class _Tp> 2765struct is_destructible 2766 : public __destructible_false<_Tp, _VSTD::is_function<_Tp>::value> {}; 2767 2768template <class _Tp> 2769struct is_destructible<_Tp[]> 2770 : public _VSTD::false_type {}; 2771 2772template <> 2773struct is_destructible<void> 2774 : public _VSTD::false_type {}; 2775 2776#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2777template <class _Tp> 2778_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v 2779 = is_destructible<_Tp>::value; 2780#endif 2781 2782#endif // __has_keyword(__is_destructible) 2783 2784// move 2785 2786template <class _Tp> 2787_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2788typename remove_reference<_Tp>::type&& 2789move(_Tp&& __t) _NOEXCEPT 2790{ 2791 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 2792 return static_cast<_Up&&>(__t); 2793} 2794 2795template <class _Tp> 2796_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2797_Tp&& 2798forward(typename remove_reference<_Tp>::type& __t) _NOEXCEPT 2799{ 2800 return static_cast<_Tp&&>(__t); 2801} 2802 2803template <class _Tp> 2804_LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2805_Tp&& 2806forward(typename remove_reference<_Tp>::type&& __t) _NOEXCEPT 2807{ 2808 static_assert(!is_lvalue_reference<_Tp>::value, 2809 "cannot forward an rvalue as an lvalue"); 2810 return static_cast<_Tp&&>(__t); 2811} 2812 2813template <class _Tp> 2814inline _LIBCPP_INLINE_VISIBILITY 2815typename decay<_Tp>::type 2816__decay_copy(_Tp&& __t) 2817{ 2818 return _VSTD::forward<_Tp>(__t); 2819} 2820 2821template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2822struct __member_pointer_traits_imp 2823{ 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..., ...), true, false> 2836{ 2837 typedef _Class _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..., ...) const, true, false> 2852{ 2853 typedef _Class const _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..., ...) volatile, true, false> 2868{ 2869 typedef _Class 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 2882template <class _Rp, class _Class, class ..._Param> 2883struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2884{ 2885 typedef _Class const volatile _ClassType; 2886 typedef _Rp _ReturnType; 2887 typedef _Rp (_FnType) (_Param..., ...); 2888}; 2889 2890#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 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..., ...) &, true, false> 2902{ 2903 typedef _Class& _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..., ...) const&, true, false> 2918{ 2919 typedef _Class const& _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..., ...) volatile&, true, false> 2934{ 2935 typedef _Class 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..., ...) const volatile&, true, false> 2950{ 2951 typedef _Class const volatile& _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..., ...) &&, true, false> 2966{ 2967 typedef _Class&& _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..., ...) const&&, true, false> 2982{ 2983 typedef _Class const&& _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..., ...) volatile&&, true, false> 2998{ 2999 typedef _Class 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 3012template <class _Rp, class _Class, class ..._Param> 3013struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 3014{ 3015 typedef _Class const volatile&& _ClassType; 3016 typedef _Rp _ReturnType; 3017 typedef _Rp (_FnType) (_Param..., ...); 3018}; 3019 3020#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 3021 3022 3023template <class _Rp, class _Class> 3024struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 3025{ 3026 typedef _Class _ClassType; 3027 typedef _Rp _ReturnType; 3028}; 3029 3030template <class _MP> 3031struct __member_pointer_traits 3032 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 3033 is_member_function_pointer<_MP>::value, 3034 is_member_object_pointer<_MP>::value> 3035{ 3036// typedef ... _ClassType; 3037// typedef ... _ReturnType; 3038// typedef ... _FnType; 3039}; 3040 3041 3042template <class _DecayedFp> 3043struct __member_pointer_class_type {}; 3044 3045template <class _Ret, class _ClassType> 3046struct __member_pointer_class_type<_Ret _ClassType::*> { 3047 typedef _ClassType type; 3048}; 3049 3050// template <class T, class... Args> struct is_constructible; 3051 3052#if defined(_LIBCPP_COMPILER_GCC) && _GNUC_VER_NEW >= 10000 3053# define _LIBCPP_GCC_SUPPORTS_IS_CONSTRUCTIBLE 3054#endif 3055 3056#if !defined(_LIBCPP_CXX03_LANG) && !__has_feature(is_constructible) && !defined(_LIBCPP_GCC_SUPPORTS_IS_CONSTRUCTIBLE) 3057 3058template <class _Tp, class... _Args> 3059struct __libcpp_is_constructible; 3060 3061template <class _To, class _From> 3062struct __is_invalid_base_to_derived_cast { 3063 static_assert(is_reference<_To>::value, "Wrong specialization"); 3064 using _RawFrom = __uncvref_t<_From>; 3065 using _RawTo = __uncvref_t<_To>; 3066 static const bool value = _And< 3067 _IsNotSame<_RawFrom, _RawTo>, 3068 is_base_of<_RawFrom, _RawTo>, 3069 _Not<__libcpp_is_constructible<_RawTo, _From>> 3070 >::value; 3071}; 3072 3073template <class _To, class _From> 3074struct __is_invalid_lvalue_to_rvalue_cast : false_type { 3075 static_assert(is_reference<_To>::value, "Wrong specialization"); 3076}; 3077 3078template <class _ToRef, class _FromRef> 3079struct __is_invalid_lvalue_to_rvalue_cast<_ToRef&&, _FromRef&> { 3080 using _RawFrom = __uncvref_t<_FromRef>; 3081 using _RawTo = __uncvref_t<_ToRef>; 3082 static const bool value = _And< 3083 _Not<is_function<_RawTo>>, 3084 _Or< 3085 _IsSame<_RawFrom, _RawTo>, 3086 is_base_of<_RawTo, _RawFrom>> 3087 >::value; 3088}; 3089 3090struct __is_constructible_helper 3091{ 3092 template <class _To> 3093 static void __eat(_To); 3094 3095 // This overload is needed to work around a Clang bug that disallows 3096 // static_cast<T&&>(e) for non-reference-compatible types. 3097 // Example: static_cast<int&&>(declval<double>()); 3098 // NOTE: The static_cast implementation below is required to support 3099 // classes with explicit conversion operators. 3100 template <class _To, class _From, 3101 class = decltype(__eat<_To>(_VSTD::declval<_From>()))> 3102 static true_type __test_cast(int); 3103 3104 template <class _To, class _From, 3105 class = decltype(static_cast<_To>(_VSTD::declval<_From>()))> 3106 static integral_constant<bool, 3107 !__is_invalid_base_to_derived_cast<_To, _From>::value && 3108 !__is_invalid_lvalue_to_rvalue_cast<_To, _From>::value 3109 > __test_cast(long); 3110 3111 template <class, class> 3112 static false_type __test_cast(...); 3113 3114 template <class _Tp, class ..._Args, 3115 class = decltype(_Tp(_VSTD::declval<_Args>()...))> 3116 static true_type __test_nary(int); 3117 template <class _Tp, class...> 3118 static false_type __test_nary(...); 3119 3120 template <class _Tp, class _A0, class = decltype(::new _Tp(_VSTD::declval<_A0>()))> 3121 static is_destructible<_Tp> __test_unary(int); 3122 template <class, class> 3123 static false_type __test_unary(...); 3124}; 3125 3126template <class _Tp, bool = is_void<_Tp>::value> 3127struct __is_default_constructible 3128 : decltype(__is_constructible_helper::__test_nary<_Tp>(0)) 3129{}; 3130 3131template <class _Tp> 3132struct __is_default_constructible<_Tp, true> : false_type {}; 3133 3134template <class _Tp> 3135struct __is_default_constructible<_Tp[], false> : false_type {}; 3136 3137template <class _Tp, size_t _Nx> 3138struct __is_default_constructible<_Tp[_Nx], false> 3139 : __is_default_constructible<typename remove_all_extents<_Tp>::type> {}; 3140 3141template <class _Tp, class... _Args> 3142struct __libcpp_is_constructible 3143{ 3144 static_assert(sizeof...(_Args) > 1, "Wrong specialization"); 3145 typedef decltype(__is_constructible_helper::__test_nary<_Tp, _Args...>(0)) 3146 type; 3147}; 3148 3149template <class _Tp> 3150struct __libcpp_is_constructible<_Tp> : __is_default_constructible<_Tp> {}; 3151 3152template <class _Tp, class _A0> 3153struct __libcpp_is_constructible<_Tp, _A0> 3154 : public decltype(__is_constructible_helper::__test_unary<_Tp, _A0>(0)) 3155{}; 3156 3157template <class _Tp, class _A0> 3158struct __libcpp_is_constructible<_Tp&, _A0> 3159 : public decltype(__is_constructible_helper:: 3160 __test_cast<_Tp&, _A0>(0)) 3161{}; 3162 3163template <class _Tp, class _A0> 3164struct __libcpp_is_constructible<_Tp&&, _A0> 3165 : public decltype(__is_constructible_helper:: 3166 __test_cast<_Tp&&, _A0>(0)) 3167{}; 3168 3169#endif 3170 3171#if __has_feature(is_constructible) || defined(_LIBCPP_GCC_SUPPORTS_IS_CONSTRUCTIBLE) 3172template <class _Tp, class ..._Args> 3173struct _LIBCPP_TEMPLATE_VIS is_constructible 3174 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 3175 {}; 3176#else 3177template <class _Tp, class... _Args> 3178struct _LIBCPP_TEMPLATE_VIS is_constructible 3179 : public __libcpp_is_constructible<_Tp, _Args...>::type {}; 3180#endif 3181 3182#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3183template <class _Tp, class ..._Args> 3184_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_constructible_v 3185 = is_constructible<_Tp, _Args...>::value; 3186#endif 3187 3188// is_default_constructible 3189 3190template <class _Tp> 3191struct _LIBCPP_TEMPLATE_VIS is_default_constructible 3192 : public is_constructible<_Tp> 3193 {}; 3194 3195#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3196template <class _Tp> 3197_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_default_constructible_v 3198 = is_default_constructible<_Tp>::value; 3199#endif 3200 3201#ifndef _LIBCPP_CXX03_LANG 3202// First of all, we can't implement this check in C++03 mode because the {} 3203// default initialization syntax isn't valid. 3204// Second, we implement the trait in a funny manner with two defaulted template 3205// arguments to workaround Clang's PR43454. 3206template <class _Tp> 3207void __test_implicit_default_constructible(_Tp); 3208 3209template <class _Tp, class = void, bool = is_default_constructible<_Tp>::value> 3210struct __is_implicitly_default_constructible 3211 : false_type 3212{ }; 3213 3214template <class _Tp> 3215struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true> 3216 : true_type 3217{ }; 3218 3219template <class _Tp> 3220struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false> 3221 : false_type 3222{ }; 3223#endif // !C++03 3224 3225// is_copy_constructible 3226 3227template <class _Tp> 3228struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 3229 : public is_constructible<_Tp, 3230 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3231 3232#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3233template <class _Tp> 3234_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_constructible_v 3235 = is_copy_constructible<_Tp>::value; 3236#endif 3237 3238// is_move_constructible 3239 3240template <class _Tp> 3241struct _LIBCPP_TEMPLATE_VIS is_move_constructible 3242 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3243 {}; 3244 3245#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3246template <class _Tp> 3247_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_constructible_v 3248 = is_move_constructible<_Tp>::value; 3249#endif 3250 3251// is_trivially_constructible 3252 3253#if __has_feature(is_trivially_constructible) || _GNUC_VER >= 501 3254 3255template <class _Tp, class... _Args> 3256struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 3257 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 3258{ 3259}; 3260 3261#else // !__has_feature(is_trivially_constructible) 3262 3263template <class _Tp, class... _Args> 3264struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 3265 : false_type 3266{ 3267}; 3268 3269template <class _Tp> 3270struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp> 3271#if __has_feature(has_trivial_constructor) || defined(_LIBCPP_COMPILER_GCC) 3272 : integral_constant<bool, __has_trivial_constructor(_Tp)> 3273#else 3274 : integral_constant<bool, is_scalar<_Tp>::value> 3275#endif 3276{ 3277}; 3278 3279template <class _Tp> 3280struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&&> 3281 : integral_constant<bool, is_scalar<_Tp>::value> 3282{ 3283}; 3284 3285template <class _Tp> 3286struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, const _Tp&> 3287 : integral_constant<bool, is_scalar<_Tp>::value> 3288{ 3289}; 3290 3291template <class _Tp> 3292struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&> 3293 : integral_constant<bool, is_scalar<_Tp>::value> 3294{ 3295}; 3296 3297#endif // !__has_feature(is_trivially_constructible) 3298 3299 3300#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3301template <class _Tp, class... _Args> 3302_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_constructible_v 3303 = is_trivially_constructible<_Tp, _Args...>::value; 3304#endif 3305 3306// is_trivially_default_constructible 3307 3308template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 3309 : public is_trivially_constructible<_Tp> 3310 {}; 3311 3312#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3313template <class _Tp> 3314_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_default_constructible_v 3315 = is_trivially_default_constructible<_Tp>::value; 3316#endif 3317 3318// is_trivially_copy_constructible 3319 3320template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 3321 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 3322 {}; 3323 3324#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3325template <class _Tp> 3326_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_constructible_v 3327 = is_trivially_copy_constructible<_Tp>::value; 3328#endif 3329 3330// is_trivially_move_constructible 3331 3332template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 3333 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3334 {}; 3335 3336#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3337template <class _Tp> 3338_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_constructible_v 3339 = is_trivially_move_constructible<_Tp>::value; 3340#endif 3341 3342// is_trivially_assignable 3343 3344#if __has_feature(is_trivially_assignable) || _GNUC_VER >= 501 3345 3346template <class _Tp, class _Arg> 3347struct is_trivially_assignable 3348 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 3349{ 3350}; 3351 3352#else // !__has_feature(is_trivially_assignable) 3353 3354template <class _Tp, class _Arg> 3355struct is_trivially_assignable 3356 : public false_type {}; 3357 3358template <class _Tp> 3359struct is_trivially_assignable<_Tp&, _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 3366template <class _Tp> 3367struct is_trivially_assignable<_Tp&, const _Tp&> 3368 : integral_constant<bool, is_scalar<_Tp>::value> {}; 3369 3370template <class _Tp> 3371struct is_trivially_assignable<_Tp&, _Tp&&> 3372 : integral_constant<bool, is_scalar<_Tp>::value> {}; 3373 3374#endif // !__has_feature(is_trivially_assignable) 3375 3376#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3377template <class _Tp, class _Arg> 3378_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_assignable_v 3379 = is_trivially_assignable<_Tp, _Arg>::value; 3380#endif 3381 3382// is_trivially_copy_assignable 3383 3384template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 3385 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3386 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3387 3388#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3389template <class _Tp> 3390_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_assignable_v 3391 = is_trivially_copy_assignable<_Tp>::value; 3392#endif 3393 3394// is_trivially_move_assignable 3395 3396template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3397 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3398 typename add_rvalue_reference<_Tp>::type> 3399 {}; 3400 3401#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3402template <class _Tp> 3403_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_assignable_v 3404 = is_trivially_move_assignable<_Tp>::value; 3405#endif 3406 3407// is_trivially_destructible 3408 3409#if __has_keyword(__is_trivially_destructible) 3410 3411template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3412 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3413 3414#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3415 3416template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3417 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3418 3419#else 3420 3421template <class _Tp> struct __libcpp_trivial_destructor 3422 : public integral_constant<bool, is_scalar<_Tp>::value || 3423 is_reference<_Tp>::value> {}; 3424 3425template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3426 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3427 3428template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3429 : public false_type {}; 3430 3431#endif 3432 3433#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3434template <class _Tp> 3435_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_destructible_v 3436 = is_trivially_destructible<_Tp>::value; 3437#endif 3438 3439// is_nothrow_constructible 3440 3441#if __has_keyword(__is_nothrow_constructible) 3442 3443template <class _Tp, class... _Args> 3444struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3445 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3446 3447#else 3448 3449template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3450 3451template <class _Tp, class... _Args> 3452struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3453 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3454{ 3455}; 3456 3457template <class _Tp> 3458void __implicit_conversion_to(_Tp) noexcept { } 3459 3460template <class _Tp, class _Arg> 3461struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3462 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3463{ 3464}; 3465 3466template <class _Tp, bool _IsReference, class... _Args> 3467struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3468 : public false_type 3469{ 3470}; 3471 3472template <class _Tp, class... _Args> 3473struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3474 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3475{ 3476}; 3477 3478template <class _Tp, size_t _Ns> 3479struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3480 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3481{ 3482}; 3483 3484#endif // _LIBCPP_HAS_NO_NOEXCEPT 3485 3486 3487#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3488template <class _Tp, class ..._Args> 3489_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_constructible_v 3490 = is_nothrow_constructible<_Tp, _Args...>::value; 3491#endif 3492 3493// is_nothrow_default_constructible 3494 3495template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3496 : public is_nothrow_constructible<_Tp> 3497 {}; 3498 3499#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3500template <class _Tp> 3501_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_default_constructible_v 3502 = is_nothrow_default_constructible<_Tp>::value; 3503#endif 3504 3505// is_nothrow_copy_constructible 3506 3507template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3508 : public is_nothrow_constructible<_Tp, 3509 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3510 3511#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3512template <class _Tp> 3513_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_constructible_v 3514 = is_nothrow_copy_constructible<_Tp>::value; 3515#endif 3516 3517// is_nothrow_move_constructible 3518 3519template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3520 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3521 {}; 3522 3523#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3524template <class _Tp> 3525_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_constructible_v 3526 = is_nothrow_move_constructible<_Tp>::value; 3527#endif 3528 3529// is_nothrow_assignable 3530 3531#if __has_keyword(__is_nothrow_assignable) 3532 3533template <class _Tp, class _Arg> 3534struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3535 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3536 3537#else 3538 3539template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3540 3541template <class _Tp, class _Arg> 3542struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3543 : public false_type 3544{ 3545}; 3546 3547template <class _Tp, class _Arg> 3548struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3549 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>()) > 3550{ 3551}; 3552 3553template <class _Tp, class _Arg> 3554struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3555 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3556{ 3557}; 3558 3559#endif // _LIBCPP_HAS_NO_NOEXCEPT 3560 3561#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3562template <class _Tp, class _Arg> 3563_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_assignable_v 3564 = is_nothrow_assignable<_Tp, _Arg>::value; 3565#endif 3566 3567// is_nothrow_copy_assignable 3568 3569template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3570 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3571 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3572 3573#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3574template <class _Tp> 3575_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_assignable_v 3576 = is_nothrow_copy_assignable<_Tp>::value; 3577#endif 3578 3579// is_nothrow_move_assignable 3580 3581template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 3582 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3583 typename add_rvalue_reference<_Tp>::type> 3584 {}; 3585 3586#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3587template <class _Tp> 3588_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_assignable_v 3589 = is_nothrow_move_assignable<_Tp>::value; 3590#endif 3591 3592// is_nothrow_destructible 3593 3594#if !defined(_LIBCPP_CXX03_LANG) 3595 3596template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3597 3598template <class _Tp> 3599struct __libcpp_is_nothrow_destructible<false, _Tp> 3600 : public false_type 3601{ 3602}; 3603 3604template <class _Tp> 3605struct __libcpp_is_nothrow_destructible<true, _Tp> 3606 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>().~_Tp()) > 3607{ 3608}; 3609 3610template <class _Tp> 3611struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3612 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3613{ 3614}; 3615 3616template <class _Tp, size_t _Ns> 3617struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3618 : public is_nothrow_destructible<_Tp> 3619{ 3620}; 3621 3622template <class _Tp> 3623struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3624 : public true_type 3625{ 3626}; 3627 3628template <class _Tp> 3629struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3630 : public true_type 3631{ 3632}; 3633 3634#else 3635 3636template <class _Tp> struct __libcpp_nothrow_destructor 3637 : public integral_constant<bool, is_scalar<_Tp>::value || 3638 is_reference<_Tp>::value> {}; 3639 3640template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3641 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3642 3643template <class _Tp> 3644struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3645 : public false_type {}; 3646 3647#endif 3648 3649#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3650template <class _Tp> 3651_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_destructible_v 3652 = is_nothrow_destructible<_Tp>::value; 3653#endif 3654 3655// is_pod 3656 3657#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3658 3659template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3660 : public integral_constant<bool, __is_pod(_Tp)> {}; 3661 3662#else 3663 3664template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3665 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3666 is_trivially_copy_constructible<_Tp>::value && 3667 is_trivially_copy_assignable<_Tp>::value && 3668 is_trivially_destructible<_Tp>::value> {}; 3669 3670#endif 3671 3672#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3673template <class _Tp> 3674_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pod_v 3675 = is_pod<_Tp>::value; 3676#endif 3677 3678// is_literal_type; 3679 3680template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_literal_type 3681 : public integral_constant<bool, __is_literal_type(_Tp)> 3682 {}; 3683 3684#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3685template <class _Tp> 3686_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_literal_type_v 3687 = is_literal_type<_Tp>::value; 3688#endif 3689 3690// is_standard_layout; 3691 3692template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3693#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3694 : public integral_constant<bool, __is_standard_layout(_Tp)> 3695#else 3696 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3697#endif 3698 {}; 3699 3700#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3701template <class _Tp> 3702_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_standard_layout_v 3703 = is_standard_layout<_Tp>::value; 3704#endif 3705 3706// is_trivially_copyable; 3707 3708template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3709#if __has_feature(is_trivially_copyable) 3710 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3711#elif _GNUC_VER >= 501 3712 : public integral_constant<bool, !is_volatile<_Tp>::value && __is_trivially_copyable(_Tp)> 3713#else 3714 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3715#endif 3716 {}; 3717 3718#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3719template <class _Tp> 3720_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copyable_v 3721 = is_trivially_copyable<_Tp>::value; 3722#endif 3723 3724// is_trivial; 3725 3726template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3727#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3728 : public integral_constant<bool, __is_trivial(_Tp)> 3729#else 3730 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3731 is_trivially_default_constructible<_Tp>::value> 3732#endif 3733 {}; 3734 3735#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3736template <class _Tp> 3737_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivial_v 3738 = is_trivial<_Tp>::value; 3739#endif 3740 3741template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3742template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3743template <class _Tp> struct __is_reference_wrapper 3744 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3745 3746#ifndef _LIBCPP_CXX03_LANG 3747 3748template <class _Fp, class _A0, 3749 class _DecayFp = typename decay<_Fp>::type, 3750 class _DecayA0 = typename decay<_A0>::type, 3751 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3752using __enable_if_bullet1 = typename enable_if 3753 < 3754 is_member_function_pointer<_DecayFp>::value 3755 && is_base_of<_ClassT, _DecayA0>::value 3756 >::type; 3757 3758template <class _Fp, class _A0, 3759 class _DecayFp = typename decay<_Fp>::type, 3760 class _DecayA0 = typename decay<_A0>::type> 3761using __enable_if_bullet2 = typename enable_if 3762 < 3763 is_member_function_pointer<_DecayFp>::value 3764 && __is_reference_wrapper<_DecayA0>::value 3765 >::type; 3766 3767template <class _Fp, class _A0, 3768 class _DecayFp = typename decay<_Fp>::type, 3769 class _DecayA0 = typename decay<_A0>::type, 3770 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3771using __enable_if_bullet3 = typename enable_if 3772 < 3773 is_member_function_pointer<_DecayFp>::value 3774 && !is_base_of<_ClassT, _DecayA0>::value 3775 && !__is_reference_wrapper<_DecayA0>::value 3776 >::type; 3777 3778template <class _Fp, class _A0, 3779 class _DecayFp = typename decay<_Fp>::type, 3780 class _DecayA0 = typename decay<_A0>::type, 3781 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3782using __enable_if_bullet4 = typename enable_if 3783 < 3784 is_member_object_pointer<_DecayFp>::value 3785 && is_base_of<_ClassT, _DecayA0>::value 3786 >::type; 3787 3788template <class _Fp, class _A0, 3789 class _DecayFp = typename decay<_Fp>::type, 3790 class _DecayA0 = typename decay<_A0>::type> 3791using __enable_if_bullet5 = typename enable_if 3792 < 3793 is_member_object_pointer<_DecayFp>::value 3794 && __is_reference_wrapper<_DecayA0>::value 3795 >::type; 3796 3797template <class _Fp, class _A0, 3798 class _DecayFp = typename decay<_Fp>::type, 3799 class _DecayA0 = typename decay<_A0>::type, 3800 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3801using __enable_if_bullet6 = typename enable_if 3802 < 3803 is_member_object_pointer<_DecayFp>::value 3804 && !is_base_of<_ClassT, _DecayA0>::value 3805 && !__is_reference_wrapper<_DecayA0>::value 3806 >::type; 3807 3808// __invoke forward declarations 3809 3810// fall back - none of the bullets 3811 3812#define _LIBCPP_INVOKE_RETURN(...) \ 3813 noexcept(noexcept(__VA_ARGS__)) -> decltype(__VA_ARGS__) \ 3814 { return __VA_ARGS__; } 3815 3816template <class ..._Args> 3817auto __invoke(__any, _Args&& ...__args) -> __nat; 3818 3819template <class ..._Args> 3820auto __invoke_constexpr(__any, _Args&& ...__args) -> __nat; 3821 3822// bullets 1, 2 and 3 3823 3824template <class _Fp, class _A0, class ..._Args, 3825 class = __enable_if_bullet1<_Fp, _A0>> 3826inline _LIBCPP_INLINE_VISIBILITY 3827_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3828__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3829_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3830 3831template <class _Fp, class _A0, class ..._Args, 3832 class = __enable_if_bullet1<_Fp, _A0>> 3833inline _LIBCPP_INLINE_VISIBILITY 3834_LIBCPP_CONSTEXPR auto 3835__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3836_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3837 3838template <class _Fp, class _A0, class ..._Args, 3839 class = __enable_if_bullet2<_Fp, _A0>> 3840inline _LIBCPP_INLINE_VISIBILITY 3841_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3842__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3843_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3844 3845template <class _Fp, class _A0, class ..._Args, 3846 class = __enable_if_bullet2<_Fp, _A0>> 3847inline _LIBCPP_INLINE_VISIBILITY 3848_LIBCPP_CONSTEXPR auto 3849__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3850_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3851 3852template <class _Fp, class _A0, class ..._Args, 3853 class = __enable_if_bullet3<_Fp, _A0>> 3854inline _LIBCPP_INLINE_VISIBILITY 3855_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3856__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3857_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3858 3859template <class _Fp, class _A0, class ..._Args, 3860 class = __enable_if_bullet3<_Fp, _A0>> 3861inline _LIBCPP_INLINE_VISIBILITY 3862_LIBCPP_CONSTEXPR auto 3863__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3864_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3865 3866// bullets 4, 5 and 6 3867 3868template <class _Fp, class _A0, 3869 class = __enable_if_bullet4<_Fp, _A0>> 3870inline _LIBCPP_INLINE_VISIBILITY 3871_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3872__invoke(_Fp&& __f, _A0&& __a0) 3873_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3874 3875template <class _Fp, class _A0, 3876 class = __enable_if_bullet4<_Fp, _A0>> 3877inline _LIBCPP_INLINE_VISIBILITY 3878_LIBCPP_CONSTEXPR auto 3879__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3880_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3881 3882template <class _Fp, class _A0, 3883 class = __enable_if_bullet5<_Fp, _A0>> 3884inline _LIBCPP_INLINE_VISIBILITY 3885_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3886__invoke(_Fp&& __f, _A0&& __a0) 3887_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3888 3889template <class _Fp, class _A0, 3890 class = __enable_if_bullet5<_Fp, _A0>> 3891inline _LIBCPP_INLINE_VISIBILITY 3892_LIBCPP_CONSTEXPR auto 3893__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3894_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3895 3896template <class _Fp, class _A0, 3897 class = __enable_if_bullet6<_Fp, _A0>> 3898inline _LIBCPP_INLINE_VISIBILITY 3899_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3900__invoke(_Fp&& __f, _A0&& __a0) 3901_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3902 3903template <class _Fp, class _A0, 3904 class = __enable_if_bullet6<_Fp, _A0>> 3905inline _LIBCPP_INLINE_VISIBILITY 3906_LIBCPP_CONSTEXPR auto 3907__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3908_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3909 3910// bullet 7 3911 3912template <class _Fp, class ..._Args> 3913inline _LIBCPP_INLINE_VISIBILITY 3914_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3915__invoke(_Fp&& __f, _Args&& ...__args) 3916_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3917 3918template <class _Fp, class ..._Args> 3919inline _LIBCPP_INLINE_VISIBILITY 3920_LIBCPP_CONSTEXPR auto 3921__invoke_constexpr(_Fp&& __f, _Args&& ...__args) 3922_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3923 3924#undef _LIBCPP_INVOKE_RETURN 3925 3926// __invokable 3927template <class _Ret, class _Fp, class ..._Args> 3928struct __invokable_r 3929{ 3930 template <class _XFp, class ..._XArgs> 3931 static auto __try_call(int) -> decltype( 3932 _VSTD::__invoke(_VSTD::declval<_XFp>(), _VSTD::declval<_XArgs>()...)); 3933 template <class _XFp, class ..._XArgs> 3934 static __nat __try_call(...); 3935 3936 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3937 // or incomplete array types as required by the standard. 3938 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3939 3940 using type = 3941 typename conditional< 3942 _IsNotSame<_Result, __nat>::value, 3943 typename conditional< 3944 is_void<_Ret>::value, 3945 true_type, 3946 is_convertible<_Result, _Ret> 3947 >::type, 3948 false_type 3949 >::type; 3950 static const bool value = type::value; 3951}; 3952template <class _Fp, class ..._Args> 3953using __invokable = __invokable_r<void, _Fp, _Args...>; 3954 3955template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3956struct __nothrow_invokable_r_imp { 3957 static const bool value = false; 3958}; 3959 3960template <class _Ret, class _Fp, class ..._Args> 3961struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3962{ 3963 typedef __nothrow_invokable_r_imp _ThisT; 3964 3965 template <class _Tp> 3966 static void __test_noexcept(_Tp) noexcept; 3967 3968 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3969 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...))); 3970}; 3971 3972template <class _Ret, class _Fp, class ..._Args> 3973struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3974{ 3975 static const bool value = noexcept( 3976 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...)); 3977}; 3978 3979template <class _Ret, class _Fp, class ..._Args> 3980using __nothrow_invokable_r = 3981 __nothrow_invokable_r_imp< 3982 __invokable_r<_Ret, _Fp, _Args...>::value, 3983 is_void<_Ret>::value, 3984 _Ret, _Fp, _Args... 3985 >; 3986 3987template <class _Fp, class ..._Args> 3988using __nothrow_invokable = 3989 __nothrow_invokable_r_imp< 3990 __invokable<_Fp, _Args...>::value, 3991 true, void, _Fp, _Args... 3992 >; 3993 3994template <class _Fp, class ..._Args> 3995struct __invoke_of 3996 : public enable_if< 3997 __invokable<_Fp, _Args...>::value, 3998 typename __invokable_r<void, _Fp, _Args...>::_Result> 3999{ 4000}; 4001 4002#endif // _LIBCPP_CXX03_LANG 4003 4004// result_of 4005 4006template <class _Callable> class result_of; 4007 4008#ifndef _LIBCPP_CXX03_LANG 4009 4010template <class _Fp, class ..._Args> 4011class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 4012 : public __invoke_of<_Fp, _Args...> 4013{ 4014}; 4015 4016#else // C++03 4017 4018template <class _Fn, bool, bool> 4019class __result_of 4020{ 4021}; 4022 4023template <class _Fn, class ..._Args> 4024class __result_of<_Fn(_Args...), true, false> 4025{ 4026public: 4027 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 4028}; 4029 4030template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 4031struct __result_of_mp; 4032 4033// member function pointer 4034 4035template <class _MP, class _Tp> 4036struct __result_of_mp<_MP, _Tp, true> 4037{ 4038 using type = typename __member_pointer_traits<_MP>::_ReturnType; 4039}; 4040 4041// member data pointer 4042 4043template <class _MP, class _Tp, bool> 4044struct __result_of_mdp; 4045 4046template <class _Rp, class _Class, class _Tp> 4047struct __result_of_mdp<_Rp _Class::*, _Tp, false> 4048{ 4049 using type = typename __apply_cv<decltype(*_VSTD::declval<_Tp>()), _Rp>::type&; 4050}; 4051 4052template <class _Rp, class _Class, class _Tp> 4053struct __result_of_mdp<_Rp _Class::*, _Tp, true> 4054{ 4055 using type = typename __apply_cv<_Tp, _Rp>::type&; 4056}; 4057 4058template <class _Rp, class _Class, class _Tp> 4059struct __result_of_mp<_Rp _Class::*, _Tp, false> 4060 : public __result_of_mdp<_Rp _Class::*, _Tp, 4061 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 4062{ 4063}; 4064 4065template <class _Fn, class _Tp> 4066class __result_of<_Fn(_Tp), 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 _Tp, class ..._Args> 4074class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 4075 : public __result_of_mp<typename remove_reference<_Fn>::type, 4076 _Tp, 4077 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 4078{ 4079}; 4080 4081template <class _Fn, class ..._Args> 4082class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 4083 : public __result_of<_Fn(_Args...), 4084 is_class<typename remove_reference<_Fn>::type>::value || 4085 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 4086 is_member_pointer<typename remove_reference<_Fn>::type>::value 4087 > 4088{ 4089}; 4090 4091#endif // C++03 4092 4093#if _LIBCPP_STD_VER > 11 4094template <class _Tp> using result_of_t = typename result_of<_Tp>::type; 4095#endif 4096 4097#if _LIBCPP_STD_VER > 14 4098 4099// invoke_result 4100 4101template <class _Fn, class... _Args> 4102struct _LIBCPP_TEMPLATE_VIS invoke_result 4103 : __invoke_of<_Fn, _Args...> 4104{ 4105}; 4106 4107template <class _Fn, class... _Args> 4108using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 4109 4110// is_invocable 4111 4112template <class _Fn, class ..._Args> 4113struct _LIBCPP_TEMPLATE_VIS is_invocable 4114 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 4115 4116template <class _Ret, class _Fn, class ..._Args> 4117struct _LIBCPP_TEMPLATE_VIS is_invocable_r 4118 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 4119 4120template <class _Fn, class ..._Args> 4121_LIBCPP_INLINE_VAR constexpr bool is_invocable_v 4122 = is_invocable<_Fn, _Args...>::value; 4123 4124template <class _Ret, class _Fn, class ..._Args> 4125_LIBCPP_INLINE_VAR constexpr bool is_invocable_r_v 4126 = is_invocable_r<_Ret, _Fn, _Args...>::value; 4127 4128// is_nothrow_invocable 4129 4130template <class _Fn, class ..._Args> 4131struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 4132 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 4133 4134template <class _Ret, class _Fn, class ..._Args> 4135struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 4136 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 4137 4138template <class _Fn, class ..._Args> 4139_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_v 4140 = is_nothrow_invocable<_Fn, _Args...>::value; 4141 4142template <class _Ret, class _Fn, class ..._Args> 4143_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_r_v 4144 = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 4145 4146#endif // _LIBCPP_STD_VER > 14 4147 4148template <class _Tp> struct __is_swappable; 4149template <class _Tp> struct __is_nothrow_swappable; 4150 4151// swap, swap_ranges 4152 4153template <class _ForwardIterator1, class _ForwardIterator2> 4154inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4155_ForwardIterator2 4156swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2); 4157 4158template <class _Tp> 4159inline _LIBCPP_INLINE_VISIBILITY 4160#ifndef _LIBCPP_CXX03_LANG 4161typename enable_if 4162< 4163 is_move_constructible<_Tp>::value && 4164 is_move_assignable<_Tp>::value 4165>::type 4166#else 4167void 4168#endif 4169_LIBCPP_CONSTEXPR_AFTER_CXX17 4170swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 4171 is_nothrow_move_assignable<_Tp>::value) 4172{ 4173 _Tp __t(_VSTD::move(__x)); 4174 __x = _VSTD::move(__y); 4175 __y = _VSTD::move(__t); 4176} 4177 4178template<class _Tp, size_t _Np> 4179inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4180typename enable_if< 4181 __is_swappable<_Tp>::value 4182>::type 4183swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 4184{ 4185 _VSTD::swap_ranges(__a, __a + _Np, __b); 4186} 4187 4188template <class _ForwardIterator1, class _ForwardIterator2> 4189inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4190_ForwardIterator2 4191swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 4192{ 4193 for(; __first1 != __last1; ++__first1, (void) ++__first2) 4194 swap(*__first1, *__first2); 4195 return __first2; 4196} 4197 4198// iter_swap 4199 4200template <class _ForwardIterator1, class _ForwardIterator2> 4201inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 4202void 4203iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b) 4204 // _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b))) 4205 _NOEXCEPT_(_NOEXCEPT_(swap(*_VSTD::declval<_ForwardIterator1>(), 4206 *_VSTD::declval<_ForwardIterator2>()))) 4207{ 4208 swap(*__a, *__b); 4209} 4210 4211// __swappable 4212 4213namespace __detail 4214{ 4215// ALL generic swap overloads MUST already have a declaration available at this point. 4216 4217template <class _Tp, class _Up = _Tp, 4218 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 4219struct __swappable_with 4220{ 4221 template <class _LHS, class _RHS> 4222 static decltype(swap(_VSTD::declval<_LHS>(), _VSTD::declval<_RHS>())) 4223 __test_swap(int); 4224 template <class, class> 4225 static __nat __test_swap(long); 4226 4227 // Extra parens are needed for the C++03 definition of decltype. 4228 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 4229 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 4230 4231 static const bool value = _IsNotSame<__swap1, __nat>::value 4232 && _IsNotSame<__swap2, __nat>::value; 4233}; 4234 4235template <class _Tp, class _Up> 4236struct __swappable_with<_Tp, _Up, false> : false_type {}; 4237 4238template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 4239struct __nothrow_swappable_with { 4240 static const bool value = 4241#ifndef _LIBCPP_HAS_NO_NOEXCEPT 4242 noexcept(swap(_VSTD::declval<_Tp>(), _VSTD::declval<_Up>())) 4243 && noexcept(swap(_VSTD::declval<_Up>(), _VSTD::declval<_Tp>())); 4244#else 4245 false; 4246#endif 4247}; 4248 4249template <class _Tp, class _Up> 4250struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 4251 4252} // __detail 4253 4254template <class _Tp> 4255struct __is_swappable 4256 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 4257{ 4258}; 4259 4260template <class _Tp> 4261struct __is_nothrow_swappable 4262 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 4263{ 4264}; 4265 4266#if _LIBCPP_STD_VER > 14 4267 4268template <class _Tp, class _Up> 4269struct _LIBCPP_TEMPLATE_VIS is_swappable_with 4270 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 4271{ 4272}; 4273 4274template <class _Tp> 4275struct _LIBCPP_TEMPLATE_VIS is_swappable 4276 : public conditional< 4277 __is_referenceable<_Tp>::value, 4278 is_swappable_with< 4279 typename add_lvalue_reference<_Tp>::type, 4280 typename add_lvalue_reference<_Tp>::type>, 4281 false_type 4282 >::type 4283{ 4284}; 4285 4286template <class _Tp, class _Up> 4287struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 4288 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 4289{ 4290}; 4291 4292template <class _Tp> 4293struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 4294 : public conditional< 4295 __is_referenceable<_Tp>::value, 4296 is_nothrow_swappable_with< 4297 typename add_lvalue_reference<_Tp>::type, 4298 typename add_lvalue_reference<_Tp>::type>, 4299 false_type 4300 >::type 4301{ 4302}; 4303 4304template <class _Tp, class _Up> 4305_LIBCPP_INLINE_VAR constexpr bool is_swappable_with_v 4306 = is_swappable_with<_Tp, _Up>::value; 4307 4308template <class _Tp> 4309_LIBCPP_INLINE_VAR constexpr bool is_swappable_v 4310 = is_swappable<_Tp>::value; 4311 4312template <class _Tp, class _Up> 4313_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_with_v 4314 = is_nothrow_swappable_with<_Tp, _Up>::value; 4315 4316template <class _Tp> 4317_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_v 4318 = is_nothrow_swappable<_Tp>::value; 4319 4320#endif // _LIBCPP_STD_VER > 14 4321 4322template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 4323 4324template <class _Tp> 4325struct __underlying_type_impl<_Tp, false> {}; 4326 4327template <class _Tp> 4328struct __underlying_type_impl<_Tp, true> 4329{ 4330 typedef __underlying_type(_Tp) type; 4331}; 4332 4333template <class _Tp> 4334struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 4335 4336#if _LIBCPP_STD_VER > 11 4337template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 4338#endif 4339 4340template <class _Tp, bool = is_enum<_Tp>::value> 4341struct __sfinae_underlying_type 4342{ 4343 typedef typename underlying_type<_Tp>::type type; 4344 typedef decltype(((type)1) + 0) __promoted_type; 4345}; 4346 4347template <class _Tp> 4348struct __sfinae_underlying_type<_Tp, false> {}; 4349 4350inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4351int __convert_to_integral(int __val) { return __val; } 4352 4353inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4354unsigned __convert_to_integral(unsigned __val) { return __val; } 4355 4356inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4357long __convert_to_integral(long __val) { return __val; } 4358 4359inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4360unsigned long __convert_to_integral(unsigned long __val) { return __val; } 4361 4362inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4363long long __convert_to_integral(long long __val) { return __val; } 4364 4365inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4366unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 4367 4368template<typename _Fp> 4369inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4370typename enable_if<is_floating_point<_Fp>::value, long long>::type 4371 __convert_to_integral(_Fp __val) { return __val; } 4372 4373#ifndef _LIBCPP_HAS_NO_INT128 4374inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4375__int128_t __convert_to_integral(__int128_t __val) { return __val; } 4376 4377inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4378__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 4379#endif 4380 4381template <class _Tp> 4382inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4383typename __sfinae_underlying_type<_Tp>::__promoted_type 4384__convert_to_integral(_Tp __val) { return __val; } 4385 4386#ifndef _LIBCPP_CXX03_LANG 4387 4388template <class _Tp> 4389struct __has_operator_addressof_member_imp 4390{ 4391 template <class _Up> 4392 static auto __test(int) 4393 -> typename __select_2nd<decltype(_VSTD::declval<_Up>().operator&()), true_type>::type; 4394 template <class> 4395 static auto __test(long) -> false_type; 4396 4397 static const bool value = decltype(__test<_Tp>(0))::value; 4398}; 4399 4400template <class _Tp> 4401struct __has_operator_addressof_free_imp 4402{ 4403 template <class _Up> 4404 static auto __test(int) 4405 -> typename __select_2nd<decltype(operator&(_VSTD::declval<_Up>())), true_type>::type; 4406 template <class> 4407 static auto __test(long) -> false_type; 4408 4409 static const bool value = decltype(__test<_Tp>(0))::value; 4410}; 4411 4412template <class _Tp> 4413struct __has_operator_addressof 4414 : public integral_constant<bool, __has_operator_addressof_member_imp<_Tp>::value 4415 || __has_operator_addressof_free_imp<_Tp>::value> 4416{}; 4417 4418#endif // _LIBCPP_CXX03_LANG 4419 4420// is_scoped_enum [meta.unary.prop] 4421 4422#if _LIBCPP_STD_VER > 20 4423template <class _Tp, bool = is_enum_v<_Tp> > 4424struct __is_scoped_enum_helper : false_type {}; 4425 4426template <class _Tp> 4427struct __is_scoped_enum_helper<_Tp, true> 4428 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 4429 4430template <class _Tp> 4431struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 4432 : public __is_scoped_enum_helper<_Tp> {}; 4433 4434template <class _Tp> 4435_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scoped_enum_v = 4436 is_scoped_enum<_Tp>::value; 4437#endif 4438 4439#if _LIBCPP_STD_VER > 14 4440 4441template <class... _Args> 4442struct conjunction : _And<_Args...> {}; 4443template<class... _Args> 4444_LIBCPP_INLINE_VAR constexpr bool conjunction_v 4445 = conjunction<_Args...>::value; 4446 4447template <class... _Args> 4448struct disjunction : _Or<_Args...> {}; 4449template<class... _Args> 4450_LIBCPP_INLINE_VAR constexpr bool disjunction_v 4451 = disjunction<_Args...>::value; 4452 4453template <class _Tp> 4454struct negation : _Not<_Tp> {}; 4455template<class _Tp> 4456_LIBCPP_INLINE_VAR constexpr bool negation_v 4457 = negation<_Tp>::value; 4458#endif // _LIBCPP_STD_VER > 14 4459 4460// These traits are used in __tree and __hash_table 4461struct __extract_key_fail_tag {}; 4462struct __extract_key_self_tag {}; 4463struct __extract_key_first_tag {}; 4464 4465template <class _ValTy, class _Key, 4466 class _RawValTy = typename __unconstref<_ValTy>::type> 4467struct __can_extract_key 4468 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 4469 __extract_key_fail_tag>::type {}; 4470 4471template <class _Pair, class _Key, class _First, class _Second> 4472struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 4473 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 4474 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 4475 4476// __can_extract_map_key uses true_type/false_type instead of the tags. 4477// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 4478// and _ValTy == _Key. 4479template <class _ValTy, class _Key, class _ContainerValueTy, 4480 class _RawValTy = typename __unconstref<_ValTy>::type> 4481struct __can_extract_map_key 4482 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 4483 4484// This specialization returns __extract_key_fail_tag for non-map containers 4485// because _Key == _ContainerValueTy 4486template <class _ValTy, class _Key, class _RawValTy> 4487struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 4488 : false_type {}; 4489 4490#ifndef _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED 4491#if _LIBCPP_STD_VER > 17 4492_LIBCPP_INLINE_VISIBILITY 4493inline constexpr bool is_constant_evaluated() noexcept { 4494 return __builtin_is_constant_evaluated(); 4495} 4496#endif 4497 4498inline _LIBCPP_CONSTEXPR 4499bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 4500#else 4501inline _LIBCPP_CONSTEXPR 4502bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; } 4503#endif 4504 4505template <class _CharT> 4506using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 4507 4508template<class _Tp> 4509using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 4510 4511_LIBCPP_END_NAMESPACE_STD 4512 4513#if _LIBCPP_STD_VER > 14 4514// std::byte 4515namespace std // purposefully not versioned 4516{ 4517 4518 4519} 4520#endif 4521 4522#endif // _LIBCPP_TYPE_TRAITS 4523