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_scalar; 55 template <class T> struct is_object; 56 template <class T> struct is_compound; 57 58 // Const-volatile properties and transformations: 59 template <class T> struct is_const; 60 template <class T> struct is_volatile; 61 template <class T> struct remove_const; 62 template <class T> struct remove_volatile; 63 template <class T> struct remove_cv; 64 template <class T> struct add_const; 65 template <class T> struct add_volatile; 66 template <class T> struct add_cv; 67 68 // Reference transformations: 69 template <class T> struct remove_reference; 70 template <class T> struct add_lvalue_reference; 71 template <class T> struct add_rvalue_reference; 72 73 // Pointer transformations: 74 template <class T> struct remove_pointer; 75 template <class T> struct add_pointer; 76 77 template<class T> struct type_identity; // C++20 78 template<class T> 79 using type_identity_t = typename type_identity<T>::type; // C++20 80 81 // Integral properties: 82 template <class T> struct is_signed; 83 template <class T> struct is_unsigned; 84 template <class T> struct make_signed; 85 template <class T> struct make_unsigned; 86 87 // Array properties and transformations: 88 template <class T> struct rank; 89 template <class T, unsigned I = 0> struct extent; 90 template <class T> struct remove_extent; 91 template <class T> struct remove_all_extents; 92 93 template <class T> struct is_bounded_array; // C++20 94 template <class T> struct is_unbounded_array; // C++20 95 96 // Member introspection: 97 template <class T> struct is_pod; 98 template <class T> struct is_trivial; 99 template <class T> struct is_trivially_copyable; 100 template <class T> struct is_standard_layout; 101 template <class T> struct is_literal_type; 102 template <class T> struct is_empty; 103 template <class T> struct is_polymorphic; 104 template <class T> struct is_abstract; 105 template <class T> struct is_final; // C++14 106 template <class T> struct is_aggregate; // C++17 107 108 template <class T, class... Args> struct is_constructible; 109 template <class T> struct is_default_constructible; 110 template <class T> struct is_copy_constructible; 111 template <class T> struct is_move_constructible; 112 template <class T, class U> struct is_assignable; 113 template <class T> struct is_copy_assignable; 114 template <class T> struct is_move_assignable; 115 template <class T, class U> struct is_swappable_with; // C++17 116 template <class T> struct is_swappable; // C++17 117 template <class T> struct is_destructible; 118 119 template <class T, class... Args> struct is_trivially_constructible; 120 template <class T> struct is_trivially_default_constructible; 121 template <class T> struct is_trivially_copy_constructible; 122 template <class T> struct is_trivially_move_constructible; 123 template <class T, class U> struct is_trivially_assignable; 124 template <class T> struct is_trivially_copy_assignable; 125 template <class T> struct is_trivially_move_assignable; 126 template <class T> struct is_trivially_destructible; 127 128 template <class T, class... Args> struct is_nothrow_constructible; 129 template <class T> struct is_nothrow_default_constructible; 130 template <class T> struct is_nothrow_copy_constructible; 131 template <class T> struct is_nothrow_move_constructible; 132 template <class T, class U> struct is_nothrow_assignable; 133 template <class T> struct is_nothrow_copy_assignable; 134 template <class T> struct is_nothrow_move_assignable; 135 template <class T, class U> struct is_nothrow_swappable_with; // C++17 136 template <class T> struct is_nothrow_swappable; // C++17 137 template <class T> struct is_nothrow_destructible; 138 139 template <class T> struct has_virtual_destructor; 140 141 template<class T> struct has_unique_object_representations; // C++17 142 143 // Relationships between types: 144 template <class T, class U> struct is_same; 145 template <class Base, class Derived> struct is_base_of; 146 147 template <class From, class To> struct is_convertible; 148 template <typename From, typename To> struct is_nothrow_convertible; // C++20 149 template <typename From, typename To> inline constexpr bool is_nothrow_convertible_v; // C++20 150 151 template <class Fn, class... ArgTypes> struct is_invocable; 152 template <class R, class Fn, class... ArgTypes> struct is_invocable_r; 153 154 template <class Fn, class... ArgTypes> struct is_nothrow_invocable; 155 template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r; 156 157 // Alignment properties and transformations: 158 template <class T> struct alignment_of; 159 template <size_t Len, size_t Align = most_stringent_alignment_requirement> 160 struct aligned_storage; 161 template <size_t Len, class... Types> struct aligned_union; 162 template <class T> struct remove_cvref; // C++20 163 164 template <class T> struct decay; 165 template <class... T> struct common_type; 166 template <class T> struct underlying_type; 167 template <class> class result_of; // undefined 168 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; 169 template <class Fn, class... ArgTypes> struct invoke_result; // C++17 170 171 // const-volatile modifications: 172 template <class T> 173 using remove_const_t = typename remove_const<T>::type; // C++14 174 template <class T> 175 using remove_volatile_t = typename remove_volatile<T>::type; // C++14 176 template <class T> 177 using remove_cv_t = typename remove_cv<T>::type; // C++14 178 template <class T> 179 using add_const_t = typename add_const<T>::type; // C++14 180 template <class T> 181 using add_volatile_t = typename add_volatile<T>::type; // C++14 182 template <class T> 183 using add_cv_t = typename add_cv<T>::type; // C++14 184 185 // reference modifications: 186 template <class T> 187 using remove_reference_t = typename remove_reference<T>::type; // C++14 188 template <class T> 189 using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; // C++14 190 template <class T> 191 using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; // C++14 192 193 // sign modifications: 194 template <class T> 195 using make_signed_t = typename make_signed<T>::type; // C++14 196 template <class T> 197 using make_unsigned_t = typename make_unsigned<T>::type; // C++14 198 199 // array modifications: 200 template <class T> 201 using remove_extent_t = typename remove_extent<T>::type; // C++14 202 template <class T> 203 using remove_all_extents_t = typename remove_all_extents<T>::type; // C++14 204 205 template <class T> 206 inline constexpr bool is_bounded_array_v 207 = is_bounded_array<T>::value; // C++20 208 inline constexpr bool is_unbounded_array_v 209 = is_unbounded_array<T>::value; // C++20 210 211 // pointer modifications: 212 template <class T> 213 using remove_pointer_t = typename remove_pointer<T>::type; // C++14 214 template <class T> 215 using add_pointer_t = typename add_pointer<T>::type; // C++14 216 217 // other transformations: 218 template <size_t Len, std::size_t Align=default-alignment> 219 using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14 220 template <std::size_t Len, class... Types> 221 using aligned_union_t = typename aligned_union<Len,Types...>::type; // C++14 222 template <class T> 223 using remove_cvref_t = typename remove_cvref<T>::type; // C++20 224 template <class T> 225 using decay_t = typename decay<T>::type; // C++14 226 template <bool b, class T=void> 227 using enable_if_t = typename enable_if<b,T>::type; // C++14 228 template <bool b, class T, class F> 229 using conditional_t = typename conditional<b,T,F>::type; // C++14 230 template <class... T> 231 using common_type_t = typename common_type<T...>::type; // C++14 232 template <class T> 233 using underlying_type_t = typename underlying_type<T>::type; // C++14 234 template <class T> 235 using result_of_t = typename result_of<T>::type; // C++14 236 template <class Fn, class... ArgTypes> 237 using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; // C++17 238 239 template <class...> 240 using void_t = void; // C++17 241 242 // See C++14 20.10.4.1, primary type categories 243 template <class T> inline constexpr bool is_void_v 244 = is_void<T>::value; // C++17 245 template <class T> inline constexpr bool is_null_pointer_v 246 = is_null_pointer<T>::value; // C++17 247 template <class T> inline constexpr bool is_integral_v 248 = is_integral<T>::value; // C++17 249 template <class T> inline constexpr bool is_floating_point_v 250 = is_floating_point<T>::value; // C++17 251 template <class T> inline constexpr bool is_array_v 252 = is_array<T>::value; // C++17 253 template <class T> inline constexpr bool is_pointer_v 254 = is_pointer<T>::value; // C++17 255 template <class T> inline constexpr bool is_lvalue_reference_v 256 = is_lvalue_reference<T>::value; // C++17 257 template <class T> inline constexpr bool is_rvalue_reference_v 258 = is_rvalue_reference<T>::value; // C++17 259 template <class T> inline constexpr bool is_member_object_pointer_v 260 = is_member_object_pointer<T>::value; // C++17 261 template <class T> inline constexpr bool is_member_function_pointer_v 262 = is_member_function_pointer<T>::value; // C++17 263 template <class T> inline constexpr bool is_enum_v 264 = is_enum<T>::value; // C++17 265 template <class T> inline constexpr bool is_union_v 266 = is_union<T>::value; // C++17 267 template <class T> inline constexpr bool is_class_v 268 = is_class<T>::value; // C++17 269 template <class T> inline constexpr bool is_function_v 270 = is_function<T>::value; // C++17 271 272 // See C++14 20.10.4.2, composite type categories 273 template <class T> inline constexpr bool is_reference_v 274 = is_reference<T>::value; // C++17 275 template <class T> inline constexpr bool is_arithmetic_v 276 = is_arithmetic<T>::value; // C++17 277 template <class T> inline constexpr bool is_fundamental_v 278 = is_fundamental<T>::value; // C++17 279 template <class T> inline constexpr bool is_object_v 280 = is_object<T>::value; // C++17 281 template <class T> inline constexpr bool is_scalar_v 282 = is_scalar<T>::value; // C++17 283 template <class T> inline constexpr bool is_compound_v 284 = is_compound<T>::value; // C++17 285 template <class T> inline constexpr bool is_member_pointer_v 286 = is_member_pointer<T>::value; // C++17 287 288 // See C++14 20.10.4.3, type properties 289 template <class T> inline constexpr bool is_const_v 290 = is_const<T>::value; // C++17 291 template <class T> inline constexpr bool is_volatile_v 292 = is_volatile<T>::value; // C++17 293 template <class T> inline constexpr bool is_trivial_v 294 = is_trivial<T>::value; // C++17 295 template <class T> inline constexpr bool is_trivially_copyable_v 296 = is_trivially_copyable<T>::value; // C++17 297 template <class T> inline constexpr bool is_standard_layout_v 298 = is_standard_layout<T>::value; // C++17 299 template <class T> inline constexpr bool is_pod_v 300 = is_pod<T>::value; // C++17 301 template <class T> inline constexpr bool is_literal_type_v 302 = is_literal_type<T>::value; // C++17 303 template <class T> inline constexpr bool is_empty_v 304 = is_empty<T>::value; // C++17 305 template <class T> inline constexpr bool is_polymorphic_v 306 = is_polymorphic<T>::value; // C++17 307 template <class T> inline constexpr bool is_abstract_v 308 = is_abstract<T>::value; // C++17 309 template <class T> inline constexpr bool is_final_v 310 = is_final<T>::value; // C++17 311 template <class T> inline constexpr bool is_aggregate_v 312 = is_aggregate<T>::value; // C++17 313 template <class T> inline constexpr bool is_signed_v 314 = is_signed<T>::value; // C++17 315 template <class T> inline constexpr bool is_unsigned_v 316 = is_unsigned<T>::value; // C++17 317 template <class T, class... Args> inline constexpr bool is_constructible_v 318 = is_constructible<T, Args...>::value; // C++17 319 template <class T> inline constexpr bool is_default_constructible_v 320 = is_default_constructible<T>::value; // C++17 321 template <class T> inline constexpr bool is_copy_constructible_v 322 = is_copy_constructible<T>::value; // C++17 323 template <class T> inline constexpr bool is_move_constructible_v 324 = is_move_constructible<T>::value; // C++17 325 template <class T, class U> inline constexpr bool is_assignable_v 326 = is_assignable<T, U>::value; // C++17 327 template <class T> inline constexpr bool is_copy_assignable_v 328 = is_copy_assignable<T>::value; // C++17 329 template <class T> inline constexpr bool is_move_assignable_v 330 = is_move_assignable<T>::value; // C++17 331 template <class T, class U> inline constexpr bool is_swappable_with_v 332 = is_swappable_with<T, U>::value; // C++17 333 template <class T> inline constexpr bool is_swappable_v 334 = is_swappable<T>::value; // C++17 335 template <class T> inline constexpr bool is_destructible_v 336 = is_destructible<T>::value; // C++17 337 template <class T, class... Args> inline constexpr bool is_trivially_constructible_v 338 = is_trivially_constructible<T, Args...>::value; // C++17 339 template <class T> inline constexpr bool is_trivially_default_constructible_v 340 = is_trivially_default_constructible<T>::value; // C++17 341 template <class T> inline constexpr bool is_trivially_copy_constructible_v 342 = is_trivially_copy_constructible<T>::value; // C++17 343 template <class T> inline constexpr bool is_trivially_move_constructible_v 344 = is_trivially_move_constructible<T>::value; // C++17 345 template <class T, class U> inline constexpr bool is_trivially_assignable_v 346 = is_trivially_assignable<T, U>::value; // C++17 347 template <class T> inline constexpr bool is_trivially_copy_assignable_v 348 = is_trivially_copy_assignable<T>::value; // C++17 349 template <class T> inline constexpr bool is_trivially_move_assignable_v 350 = is_trivially_move_assignable<T>::value; // C++17 351 template <class T> inline constexpr bool is_trivially_destructible_v 352 = is_trivially_destructible<T>::value; // C++17 353 template <class T, class... Args> inline constexpr bool is_nothrow_constructible_v 354 = is_nothrow_constructible<T, Args...>::value; // C++17 355 template <class T> inline constexpr bool is_nothrow_default_constructible_v 356 = is_nothrow_default_constructible<T>::value; // C++17 357 template <class T> inline constexpr bool is_nothrow_copy_constructible_v 358 = is_nothrow_copy_constructible<T>::value; // C++17 359 template <class T> inline constexpr bool is_nothrow_move_constructible_v 360 = is_nothrow_move_constructible<T>::value; // C++17 361 template <class T, class U> inline constexpr bool is_nothrow_assignable_v 362 = is_nothrow_assignable<T, U>::value; // C++17 363 template <class T> inline constexpr bool is_nothrow_copy_assignable_v 364 = is_nothrow_copy_assignable<T>::value; // C++17 365 template <class T> inline constexpr bool is_nothrow_move_assignable_v 366 = is_nothrow_move_assignable<T>::value; // C++17 367 template <class T, class U> inline constexpr bool is_nothrow_swappable_with_v 368 = is_nothrow_swappable_with<T, U>::value; // C++17 369 template <class T> inline constexpr bool is_nothrow_swappable_v 370 = is_nothrow_swappable<T>::value; // C++17 371 template <class T> inline constexpr bool is_nothrow_destructible_v 372 = is_nothrow_destructible<T>::value; // C++17 373 template <class T> inline constexpr bool has_virtual_destructor_v 374 = has_virtual_destructor<T>::value; // C++17 375 template<class T> inline constexpr bool has_unique_object_representations_v // C++17 376 = has_unique_object_representations<T>::value; 377 378 // See C++14 20.10.5, type property queries 379 template <class T> inline constexpr size_t alignment_of_v 380 = alignment_of<T>::value; // C++17 381 template <class T> inline constexpr size_t rank_v 382 = rank<T>::value; // C++17 383 template <class T, unsigned I = 0> inline constexpr size_t extent_v 384 = extent<T, I>::value; // C++17 385 386 // See C++14 20.10.6, type relations 387 template <class T, class U> inline constexpr bool is_same_v 388 = is_same<T, U>::value; // C++17 389 template <class Base, class Derived> inline constexpr bool is_base_of_v 390 = is_base_of<Base, Derived>::value; // C++17 391 template <class From, class To> inline constexpr bool is_convertible_v 392 = is_convertible<From, To>::value; // C++17 393 template <class Fn, class... ArgTypes> inline constexpr bool is_invocable_v 394 = is_invocable<Fn, ArgTypes...>::value; // C++17 395 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_invocable_r_v 396 = is_invocable_r<R, Fn, ArgTypes...>::value; // C++17 397 template <class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_v 398 = is_nothrow_invocable<Fn, ArgTypes...>::value; // C++17 399 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_r_v 400 = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; // C++17 401 402 // [meta.logical], logical operator traits: 403 template<class... B> struct conjunction; // C++17 404 template<class... B> 405 inline constexpr bool conjunction_v = conjunction<B...>::value; // C++17 406 template<class... B> struct disjunction; // C++17 407 template<class... B> 408 inline constexpr bool disjunction_v = disjunction<B...>::value; // C++17 409 template<class B> struct negation; // C++17 410 template<class B> 411 inline constexpr bool negation_v = negation<B>::value; // C++17 412 413} 414 415*/ 416#include <__config> 417#include <cstddef> 418#include <version> 419 420#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 421#pragma GCC system_header 422#endif 423 424_LIBCPP_BEGIN_NAMESPACE_STD 425 426template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 427template <class _Tp> class _LIBCPP_TEMPLATE_VIS reference_wrapper; 428template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 429 430 431template <class _Tp, _Tp __v> 432struct _LIBCPP_TEMPLATE_VIS integral_constant 433{ 434 static _LIBCPP_CONSTEXPR const _Tp value = __v; 435 typedef _Tp value_type; 436 typedef integral_constant type; 437 _LIBCPP_INLINE_VISIBILITY 438 _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;} 439#if _LIBCPP_STD_VER > 11 440 _LIBCPP_INLINE_VISIBILITY 441 constexpr value_type operator ()() const _NOEXCEPT {return value;} 442#endif 443}; 444 445template <class _Tp, _Tp __v> 446_LIBCPP_CONSTEXPR const _Tp integral_constant<_Tp, __v>::value; 447 448#if _LIBCPP_STD_VER > 14 449template <bool __b> 450using bool_constant = integral_constant<bool, __b>; 451#define _LIBCPP_BOOL_CONSTANT(__b) bool_constant<(__b)> 452#else 453#define _LIBCPP_BOOL_CONSTANT(__b) integral_constant<bool,(__b)> 454#endif 455 456typedef _LIBCPP_BOOL_CONSTANT(true) true_type; 457typedef _LIBCPP_BOOL_CONSTANT(false) false_type; 458 459template <bool _Val> 460using _BoolConstant _LIBCPP_NODEBUG_TYPE = integral_constant<bool, _Val>; 461 462template <bool> struct _MetaBase; 463template <> 464struct _MetaBase<true> { 465 template <class _Tp, class _Up> 466 using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Tp; 467 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 468 using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _FirstFn<_Args...>; 469 template <class _First, class...> 470 using _FirstImpl _LIBCPP_NODEBUG_TYPE = _First; 471 template <class, class _Second, class...> 472 using _SecondImpl _LIBCPP_NODEBUG_TYPE = _Second; 473 template <class _Tp = void> 474 using _EnableIfImpl _LIBCPP_NODEBUG_TYPE = _Tp; 475 template <class _Result, class _First, class ..._Rest> 476 using _OrImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 477 template <class _Result, class _First, class ..._Rest> 478 using _AndImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value == true && sizeof...(_Rest) != 0>::template _AndImpl<_First, _Rest...>; 479}; 480 481template <> 482struct _MetaBase<false> { 483 template <class _Tp, class _Up> 484 using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Up; 485 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 486 using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _SecondFn<_Args...>; 487 template <class _Result, class ...> 488 using _OrImpl _LIBCPP_NODEBUG_TYPE = _Result; 489 template <class _Result, class ...> 490 using _AndImpl _LIBCPP_NODEBUG_TYPE = _Result; 491}; 492template <bool _Cond, class _Ret = void> 493using _EnableIf _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>; 494template <bool _Cond, class _IfRes, class _ElseRes> 495using _If _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 496template <class ..._Rest> 497using _Or _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 498template <class ..._Rest> 499using _And _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _AndImpl<true_type, _Rest...>; 500template <class _Pred> 501struct _Not : _BoolConstant<!_Pred::value> {}; 502template <class ..._Args> 503using _FirstType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 504template <class ..._Args> 505using _SecondType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 506 507template <template <class...> class _Func, class ..._Args> 508struct _Lazy : _Func<_Args...> {}; 509 510// Member detector base 511 512template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 513true_type __sfinae_test_impl(int); 514template <template <class...> class, class ...> 515false_type __sfinae_test_impl(...); 516 517template <template <class ...> class _Templ, class ..._Args> 518using _IsValidExpansion _LIBCPP_NODEBUG_TYPE = decltype(std::__sfinae_test_impl<_Templ, _Args...>(0)); 519 520template <class> 521struct __void_t { typedef void type; }; 522 523template <class _Tp> 524struct __identity { typedef _Tp type; }; 525 526template <class _Tp, bool> 527struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 528 529template <bool _Bp, class _If, class _Then> 530 struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;}; 531template <class _If, class _Then> 532 struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;}; 533 534#if _LIBCPP_STD_VER > 11 535template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type; 536#endif 537 538template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {}; 539template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;}; 540 541#if _LIBCPP_STD_VER > 11 542template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; 543#endif 544 545// is_same 546 547template <class _Tp, class _Up> struct _LIBCPP_TEMPLATE_VIS is_same : public false_type {}; 548template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {}; 549 550#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 551template <class _Tp, class _Up> 552_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v 553 = is_same<_Tp, _Up>::value; 554#endif 555 556template <class _Tp, class _Up> 557using _IsSame = _BoolConstant< 558#ifdef __clang__ 559 __is_same(_Tp, _Up) 560#else 561 _VSTD::is_same<_Tp, _Up>::value 562#endif 563>; 564 565template <class _Tp, class _Up> 566using _IsNotSame = _BoolConstant< 567#ifdef __clang__ 568 !__is_same(_Tp, _Up) 569#else 570 !_VSTD::is_same<_Tp, _Up>::value 571#endif 572>; 573// addressof 574#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF 575 576template <class _Tp> 577inline _LIBCPP_CONSTEXPR_AFTER_CXX14 578_LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY 579_Tp* 580addressof(_Tp& __x) _NOEXCEPT 581{ 582 return __builtin_addressof(__x); 583} 584 585#else 586 587template <class _Tp> 588inline _LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY 589_Tp* 590addressof(_Tp& __x) _NOEXCEPT 591{ 592 return reinterpret_cast<_Tp *>( 593 const_cast<char *>(&reinterpret_cast<const volatile char &>(__x))); 594} 595 596#endif // _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF 597 598#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF) 599// Objective-C++ Automatic Reference Counting uses qualified pointers 600// that require special addressof() signatures. When 601// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler 602// itself is providing these definitions. Otherwise, we provide them. 603template <class _Tp> 604inline _LIBCPP_INLINE_VISIBILITY 605__strong _Tp* 606addressof(__strong _Tp& __x) _NOEXCEPT 607{ 608 return &__x; 609} 610 611#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK 612template <class _Tp> 613inline _LIBCPP_INLINE_VISIBILITY 614__weak _Tp* 615addressof(__weak _Tp& __x) _NOEXCEPT 616{ 617 return &__x; 618} 619#endif 620 621template <class _Tp> 622inline _LIBCPP_INLINE_VISIBILITY 623__autoreleasing _Tp* 624addressof(__autoreleasing _Tp& __x) _NOEXCEPT 625{ 626 return &__x; 627} 628 629template <class _Tp> 630inline _LIBCPP_INLINE_VISIBILITY 631__unsafe_unretained _Tp* 632addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT 633{ 634 return &__x; 635} 636#endif 637 638#if !defined(_LIBCPP_CXX03_LANG) 639template <class _Tp> _Tp* addressof(const _Tp&&) noexcept = delete; 640#endif 641 642struct __two {char __lx[2];}; 643 644// helper class: 645 646// is_const 647 648template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 649template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 650 651#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 652template <class _Tp> 653_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v 654 = is_const<_Tp>::value; 655#endif 656 657// is_volatile 658 659template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {}; 660template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {}; 661 662#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 663template <class _Tp> 664_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v 665 = is_volatile<_Tp>::value; 666#endif 667 668// remove_const 669 670template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const {typedef _Tp type;}; 671template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;}; 672#if _LIBCPP_STD_VER > 11 673template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type; 674#endif 675 676// remove_volatile 677 678template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef _Tp type;}; 679template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;}; 680#if _LIBCPP_STD_VER > 11 681template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type; 682#endif 683 684// remove_cv 685 686template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv 687{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 688#if _LIBCPP_STD_VER > 11 689template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type; 690#endif 691 692// is_void 693 694template <class _Tp> struct __libcpp_is_void : public false_type {}; 695template <> struct __libcpp_is_void<void> : public true_type {}; 696 697template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void 698 : public __libcpp_is_void<typename remove_cv<_Tp>::type> {}; 699 700#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 701template <class _Tp> 702_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v 703 = is_void<_Tp>::value; 704#endif 705 706// __is_nullptr_t 707 708template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 709template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 710 711template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 712 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 713 714#if _LIBCPP_STD_VER > 11 715template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 716 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 717 718#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 719template <class _Tp> 720_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_null_pointer_v 721 = is_null_pointer<_Tp>::value; 722#endif 723#endif 724 725// is_integral 726 727template <class _Tp> struct __libcpp_is_integral : public false_type {}; 728template <> struct __libcpp_is_integral<bool> : public true_type {}; 729template <> struct __libcpp_is_integral<char> : public true_type {}; 730template <> struct __libcpp_is_integral<signed char> : public true_type {}; 731template <> struct __libcpp_is_integral<unsigned char> : public true_type {}; 732template <> struct __libcpp_is_integral<wchar_t> : public true_type {}; 733#ifndef _LIBCPP_NO_HAS_CHAR8_T 734template <> struct __libcpp_is_integral<char8_t> : public true_type {}; 735#endif 736#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 737template <> struct __libcpp_is_integral<char16_t> : public true_type {}; 738template <> struct __libcpp_is_integral<char32_t> : public true_type {}; 739#endif // _LIBCPP_HAS_NO_UNICODE_CHARS 740template <> struct __libcpp_is_integral<short> : public true_type {}; 741template <> struct __libcpp_is_integral<unsigned short> : public true_type {}; 742template <> struct __libcpp_is_integral<int> : public true_type {}; 743template <> struct __libcpp_is_integral<unsigned int> : public true_type {}; 744template <> struct __libcpp_is_integral<long> : public true_type {}; 745template <> struct __libcpp_is_integral<unsigned long> : public true_type {}; 746template <> struct __libcpp_is_integral<long long> : public true_type {}; 747template <> struct __libcpp_is_integral<unsigned long long> : public true_type {}; 748#ifndef _LIBCPP_HAS_NO_INT128 749template <> struct __libcpp_is_integral<__int128_t> : public true_type {}; 750template <> struct __libcpp_is_integral<__uint128_t> : public true_type {}; 751#endif 752 753template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral 754 : public __libcpp_is_integral<typename remove_cv<_Tp>::type> {}; 755 756#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 757template <class _Tp> 758_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v 759 = is_integral<_Tp>::value; 760#endif 761 762// is_floating_point 763 764template <class _Tp> struct __libcpp_is_floating_point : public false_type {}; 765template <> struct __libcpp_is_floating_point<float> : public true_type {}; 766template <> struct __libcpp_is_floating_point<double> : public true_type {}; 767template <> struct __libcpp_is_floating_point<long double> : public true_type {}; 768 769template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point 770 : public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {}; 771 772#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 773template <class _Tp> 774_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_floating_point_v 775 = is_floating_point<_Tp>::value; 776#endif 777 778// is_array 779 780template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array 781 : public false_type {}; 782template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]> 783 : public true_type {}; 784template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]> 785 : public true_type {}; 786 787#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 788template <class _Tp> 789_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v 790 = is_array<_Tp>::value; 791#endif 792 793// is_pointer 794 795template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 796template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 797 798template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 799#if defined(_LIBCPP_HAS_OBJC_ARC) 800template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 801template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 802template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 803template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 804#endif 805 806template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 807 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 808 809#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 810template <class _Tp> 811_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v 812 = is_pointer<_Tp>::value; 813#endif 814 815// is_reference 816 817template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 818template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 819 820template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 821template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 822 823template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 824template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 825template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : 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_reference_v 830 = is_reference<_Tp>::value; 831 832template <class _Tp> 833_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v 834 = is_lvalue_reference<_Tp>::value; 835 836template <class _Tp> 837_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v 838 = is_rvalue_reference<_Tp>::value; 839#endif 840// is_union 841 842#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 843 844template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 845 : public integral_constant<bool, __is_union(_Tp)> {}; 846 847#else 848 849template <class _Tp> struct __libcpp_union : public false_type {}; 850template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 851 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 852 853#endif 854 855#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 856template <class _Tp> 857_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_union_v 858 = is_union<_Tp>::value; 859#endif 860 861// is_class 862 863#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 864 865template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 866 : public integral_constant<bool, __is_class(_Tp)> {}; 867 868#else 869 870namespace __is_class_imp 871{ 872template <class _Tp> char __test(int _Tp::*); 873template <class _Tp> __two __test(...); 874} 875 876template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 877 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 878 879#endif 880 881#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 882template <class _Tp> 883_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_class_v 884 = is_class<_Tp>::value; 885#endif 886 887// is_function 888 889template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 890 : public _BoolConstant< 891#ifdef __clang__ 892 __is_function(_Tp) 893#else 894 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 895#endif 896 > {}; 897 898 899#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 900template <class _Tp> 901_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_function_v 902 = is_function<_Tp>::value; 903#endif 904 905template <class _Tp> struct __libcpp_is_member_pointer { 906 enum { 907 __is_member = false, 908 __is_func = false, 909 __is_obj = false 910 }; 911}; 912template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 913 enum { 914 __is_member = true, 915 __is_func = is_function<_Tp>::value, 916 __is_obj = !__is_func, 917 }; 918}; 919 920 921template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 922 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 923 924#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 925template <class _Tp> 926_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 927 = is_member_function_pointer<_Tp>::value; 928#endif 929 930// is_member_pointer 931 932template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 933 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 934 935#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 936template <class _Tp> 937_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v 938 = is_member_pointer<_Tp>::value; 939#endif 940 941// is_member_object_pointer 942 943template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 944 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 945 946#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 947template <class _Tp> 948_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 949 = is_member_object_pointer<_Tp>::value; 950#endif 951 952// is_enum 953 954#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 955 956template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 957 : public integral_constant<bool, __is_enum(_Tp)> {}; 958 959#else 960 961template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 962 : public integral_constant<bool, !is_void<_Tp>::value && 963 !is_integral<_Tp>::value && 964 !is_floating_point<_Tp>::value && 965 !is_array<_Tp>::value && 966 !is_pointer<_Tp>::value && 967 !is_reference<_Tp>::value && 968 !is_member_pointer<_Tp>::value && 969 !is_union<_Tp>::value && 970 !is_class<_Tp>::value && 971 !is_function<_Tp>::value > {}; 972 973#endif 974 975#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 976template <class _Tp> 977_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v 978 = is_enum<_Tp>::value; 979#endif 980 981// is_arithmetic 982 983template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 984 : public integral_constant<bool, is_integral<_Tp>::value || 985 is_floating_point<_Tp>::value> {}; 986 987#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 988template <class _Tp> 989_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v 990 = is_arithmetic<_Tp>::value; 991#endif 992 993// is_fundamental 994 995template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 996 : public integral_constant<bool, is_void<_Tp>::value || 997 __is_nullptr_t<_Tp>::value || 998 is_arithmetic<_Tp>::value> {}; 999 1000#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1001template <class _Tp> 1002_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v 1003 = is_fundamental<_Tp>::value; 1004#endif 1005 1006// is_scalar 1007 1008template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1009 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1010 is_member_pointer<_Tp>::value || 1011 is_pointer<_Tp>::value || 1012 __is_nullptr_t<_Tp>::value || 1013 is_enum<_Tp>::value > {}; 1014 1015template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1016 1017#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1018template <class _Tp> 1019_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v 1020 = is_scalar<_Tp>::value; 1021#endif 1022 1023// is_object 1024 1025template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1026 : public integral_constant<bool, is_scalar<_Tp>::value || 1027 is_array<_Tp>::value || 1028 is_union<_Tp>::value || 1029 is_class<_Tp>::value > {}; 1030 1031#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1032template <class _Tp> 1033_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v 1034 = is_object<_Tp>::value; 1035#endif 1036 1037// is_compound 1038 1039template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1040 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1041 1042#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1043template <class _Tp> 1044_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v 1045 = is_compound<_Tp>::value; 1046#endif 1047 1048 1049// __is_referenceable [defns.referenceable] 1050 1051struct __is_referenceable_impl { 1052 template <class _Tp> static _Tp& __test(int); 1053 template <class _Tp> static __two __test(...); 1054}; 1055 1056template <class _Tp> 1057struct __is_referenceable : integral_constant<bool, 1058 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1059 1060 1061// add_const 1062 1063template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1064 typedef _LIBCPP_NODEBUG_TYPE const _Tp type; 1065}; 1066 1067#if _LIBCPP_STD_VER > 11 1068template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1069#endif 1070 1071// add_volatile 1072 1073template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1074 typedef _LIBCPP_NODEBUG_TYPE volatile _Tp type; 1075}; 1076 1077#if _LIBCPP_STD_VER > 11 1078template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1079#endif 1080 1081// add_cv 1082template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1083 typedef _LIBCPP_NODEBUG_TYPE const volatile _Tp type; 1084}; 1085 1086#if _LIBCPP_STD_VER > 11 1087template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1088#endif 1089 1090// remove_reference 1091 1092template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1093template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1094template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1095 1096#if _LIBCPP_STD_VER > 11 1097template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1098#endif 1099 1100// add_lvalue_reference 1101 1102template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1103template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; }; 1104 1105template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1106{typedef _LIBCPP_NODEBUG_TYPE typename __add_lvalue_reference_impl<_Tp>::type type;}; 1107 1108#if _LIBCPP_STD_VER > 11 1109template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1110#endif 1111 1112template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1113template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp&& type; }; 1114 1115template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1116{typedef _LIBCPP_NODEBUG_TYPE typename __add_rvalue_reference_impl<_Tp>::type type;}; 1117 1118#if _LIBCPP_STD_VER > 11 1119template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1120#endif 1121 1122template <class _Tp> _Tp&& __declval(int); 1123template <class _Tp> _Tp __declval(long); 1124 1125template <class _Tp> 1126decltype(_VSTD::__declval<_Tp>(0)) 1127declval() _NOEXCEPT; 1128 1129// __uncvref 1130 1131template <class _Tp> 1132struct __uncvref { 1133 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<typename remove_reference<_Tp>::type>::type type; 1134}; 1135 1136template <class _Tp> 1137struct __unconstref { 1138 typedef _LIBCPP_NODEBUG_TYPE typename remove_const<typename remove_reference<_Tp>::type>::type type; 1139}; 1140 1141#ifndef _LIBCPP_CXX03_LANG 1142template <class _Tp> 1143using __uncvref_t _LIBCPP_NODEBUG_TYPE = typename __uncvref<_Tp>::type; 1144#endif 1145 1146// __is_same_uncvref 1147 1148template <class _Tp, class _Up> 1149struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type, 1150 typename __uncvref<_Up>::type> {}; 1151 1152#if _LIBCPP_STD_VER > 17 1153// remove_cvref - same as __uncvref 1154template <class _Tp> 1155struct remove_cvref : public __uncvref<_Tp> {}; 1156 1157template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1158#endif 1159 1160 1161struct __any 1162{ 1163 __any(...); 1164}; 1165 1166// remove_pointer 1167 1168template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1169template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1170template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1171template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1172template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1173 1174#if _LIBCPP_STD_VER > 11 1175template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1176#endif 1177 1178// add_pointer 1179 1180template <class _Tp, 1181 bool = __is_referenceable<_Tp>::value || 1182 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1183struct __add_pointer_impl 1184 {typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type* type;}; 1185template <class _Tp> struct __add_pointer_impl<_Tp, false> 1186 {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1187 1188template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1189 {typedef _LIBCPP_NODEBUG_TYPE typename __add_pointer_impl<_Tp>::type type;}; 1190 1191#if _LIBCPP_STD_VER > 11 1192template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1193#endif 1194 1195// type_identity 1196#if _LIBCPP_STD_VER > 17 1197template<class _Tp> struct type_identity { typedef _Tp type; }; 1198template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1199#endif 1200 1201// is_signed 1202 1203template <class _Tp, bool = is_integral<_Tp>::value> 1204struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {}; 1205 1206template <class _Tp> 1207struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1208 1209template <class _Tp, bool = is_arithmetic<_Tp>::value> 1210struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1211 1212template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1213 1214template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1215 1216#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1217template <class _Tp> 1218_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v 1219 = is_signed<_Tp>::value; 1220#endif 1221 1222// is_unsigned 1223 1224template <class _Tp, bool = is_integral<_Tp>::value> 1225struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {}; 1226 1227template <class _Tp> 1228struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1229 1230template <class _Tp, bool = is_arithmetic<_Tp>::value> 1231struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1232 1233template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1234 1235template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_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_unsigned_v 1240 = is_unsigned<_Tp>::value; 1241#endif 1242 1243// rank 1244 1245template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1246 : public integral_constant<size_t, 0> {}; 1247template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1248 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1249template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1250 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1251 1252#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1253template <class _Tp> 1254_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t rank_v 1255 = rank<_Tp>::value; 1256#endif 1257 1258// extent 1259 1260template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1261 : public integral_constant<size_t, 0> {}; 1262template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1263 : public integral_constant<size_t, 0> {}; 1264template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1265 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1266template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1267 : public integral_constant<size_t, _Np> {}; 1268template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1269 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1270 1271#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1272template <class _Tp, unsigned _Ip = 0> 1273_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v 1274 = extent<_Tp, _Ip>::value; 1275#endif 1276 1277// remove_extent 1278 1279template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1280 {typedef _Tp type;}; 1281template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1282 {typedef _Tp type;}; 1283template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1284 {typedef _Tp type;}; 1285 1286#if _LIBCPP_STD_VER > 11 1287template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1288#endif 1289 1290// remove_all_extents 1291 1292template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1293 {typedef _Tp type;}; 1294template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1295 {typedef typename remove_all_extents<_Tp>::type type;}; 1296template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1297 {typedef typename remove_all_extents<_Tp>::type type;}; 1298 1299#if _LIBCPP_STD_VER > 11 1300template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1301#endif 1302 1303#if _LIBCPP_STD_VER > 17 1304// is_bounded_array 1305 1306template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1307template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1308 1309template <class _Tp> 1310_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1311bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1312 1313// is_unbounded_array 1314 1315template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1316template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1317 1318template <class _Tp> 1319_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1320bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1321#endif 1322 1323// decay 1324 1325template <class _Up, bool> 1326struct __decay { 1327 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<_Up>::type type; 1328}; 1329 1330template <class _Up> 1331struct __decay<_Up, true> { 1332public: 1333 typedef _LIBCPP_NODEBUG_TYPE typename conditional 1334 < 1335 is_array<_Up>::value, 1336 typename remove_extent<_Up>::type*, 1337 typename conditional 1338 < 1339 is_function<_Up>::value, 1340 typename add_pointer<_Up>::type, 1341 typename remove_cv<_Up>::type 1342 >::type 1343 >::type type; 1344}; 1345 1346template <class _Tp> 1347struct _LIBCPP_TEMPLATE_VIS decay 1348{ 1349private: 1350 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 1351public: 1352 typedef _LIBCPP_NODEBUG_TYPE typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1353}; 1354 1355#if _LIBCPP_STD_VER > 11 1356template <class _Tp> using decay_t = typename decay<_Tp>::type; 1357#endif 1358 1359// is_abstract 1360 1361template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1362 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1363 1364#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1365template <class _Tp> 1366_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_abstract_v 1367 = is_abstract<_Tp>::value; 1368#endif 1369 1370// is_final 1371 1372template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1373__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1374 1375#if _LIBCPP_STD_VER > 11 1376template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1377is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1378#endif 1379 1380#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1381template <class _Tp> 1382_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_final_v 1383 = is_final<_Tp>::value; 1384#endif 1385 1386// is_aggregate 1387#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1388 1389template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1390is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1391 1392#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1393template <class _Tp> 1394_LIBCPP_INLINE_VAR constexpr bool is_aggregate_v 1395 = is_aggregate<_Tp>::value; 1396#endif 1397 1398#endif // _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1399 1400// is_base_of 1401 1402template <class _Bp, class _Dp> 1403struct _LIBCPP_TEMPLATE_VIS is_base_of 1404 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1405 1406#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1407template <class _Bp, class _Dp> 1408_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_base_of_v 1409 = is_base_of<_Bp, _Dp>::value; 1410#endif 1411 1412// is_convertible 1413 1414#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1415 1416template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1417 : public integral_constant<bool, __is_convertible_to(_T1, _T2) && 1418 !is_abstract<_T2>::value> {}; 1419 1420#else // __has_feature(is_convertible_to) 1421 1422namespace __is_convertible_imp 1423{ 1424template <class _Tp> void __test_convert(_Tp); 1425 1426template <class _From, class _To, class = void> 1427struct __is_convertible_test : public false_type {}; 1428 1429template <class _From, class _To> 1430struct __is_convertible_test<_From, _To, 1431 decltype(_VSTD::__is_convertible_imp::__test_convert<_To>(_VSTD::declval<_From>()))> : public true_type 1432{}; 1433 1434template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1435 bool _IsFunction = is_function<_Tp>::value, 1436 bool _IsVoid = is_void<_Tp>::value> 1437 struct __is_array_function_or_void {enum {value = 0};}; 1438template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1439template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1440template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1441} 1442 1443template <class _Tp, 1444 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1445struct __is_convertible_check 1446{ 1447 static const size_t __v = 0; 1448}; 1449 1450template <class _Tp> 1451struct __is_convertible_check<_Tp, 0> 1452{ 1453 static const size_t __v = sizeof(_Tp); 1454}; 1455 1456template <class _T1, class _T2, 1457 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1458 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1459struct __is_convertible 1460 : public integral_constant<bool, 1461 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1462 > 1463{}; 1464 1465template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1466template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1467template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1468template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1469 1470template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1471template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1472template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1473template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1474 1475template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1476template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1477template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1478template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1479 1480template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1481 : public __is_convertible<_T1, _T2> 1482{ 1483 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1484 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1485}; 1486 1487#endif // __has_feature(is_convertible_to) 1488 1489#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1490template <class _From, class _To> 1491_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_convertible_v 1492 = is_convertible<_From, _To>::value; 1493#endif 1494 1495// is_nothrow_convertible 1496 1497#if _LIBCPP_STD_VER > 17 1498 1499template <typename _Tp> 1500static void __test_noexcept(_Tp) noexcept; 1501 1502template<typename _Fm, typename _To> 1503static bool_constant<noexcept(__test_noexcept<_To>(declval<_Fm>()))> 1504__is_nothrow_convertible_test(); 1505 1506template <typename _Fm, typename _To> 1507struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1508{ }; 1509 1510template <typename _Fm, typename _To> 1511struct is_nothrow_convertible : _Or< 1512 _And<is_void<_To>, is_void<_Fm>>, 1513 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1514>::type { }; 1515 1516template <typename _Fm, typename _To> 1517inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1518 1519#endif // _LIBCPP_STD_VER > 17 1520 1521// is_empty 1522 1523#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1524 1525template <class _Tp> 1526struct _LIBCPP_TEMPLATE_VIS is_empty 1527 : public integral_constant<bool, __is_empty(_Tp)> {}; 1528 1529#else // __has_feature(is_empty) 1530 1531template <class _Tp> 1532struct __is_empty1 1533 : public _Tp 1534{ 1535 double __lx; 1536}; 1537 1538struct __is_empty2 1539{ 1540 double __lx; 1541}; 1542 1543template <class _Tp, bool = is_class<_Tp>::value> 1544struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1545 1546template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1547 1548template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1549 1550#endif // __has_feature(is_empty) 1551 1552#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1553template <class _Tp> 1554_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_empty_v 1555 = is_empty<_Tp>::value; 1556#endif 1557 1558// is_polymorphic 1559 1560#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1561 1562template <class _Tp> 1563struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1564 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1565 1566#else 1567 1568template<typename _Tp> char &__is_polymorphic_impl( 1569 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1570 int>::type); 1571template<typename _Tp> __two &__is_polymorphic_impl(...); 1572 1573template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1574 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1575 1576#endif // __has_feature(is_polymorphic) 1577 1578#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1579template <class _Tp> 1580_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_polymorphic_v 1581 = is_polymorphic<_Tp>::value; 1582#endif 1583 1584// has_virtual_destructor 1585 1586#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1587 1588template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1589 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1590 1591#else 1592 1593template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1594 : public false_type {}; 1595 1596#endif 1597 1598#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1599template <class _Tp> 1600_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_virtual_destructor_v 1601 = has_virtual_destructor<_Tp>::value; 1602#endif 1603 1604// has_unique_object_representations 1605 1606#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS) 1607 1608template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1609 : public integral_constant<bool, 1610 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1611 1612#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1613template <class _Tp> 1614_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_unique_object_representations_v 1615 = has_unique_object_representations<_Tp>::value; 1616#endif 1617 1618#endif 1619 1620// alignment_of 1621 1622template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1623 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1624 1625#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1626template <class _Tp> 1627_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t alignment_of_v 1628 = alignment_of<_Tp>::value; 1629#endif 1630 1631// aligned_storage 1632 1633template <class _Hp, class _Tp> 1634struct __type_list 1635{ 1636 typedef _Hp _Head; 1637 typedef _Tp _Tail; 1638}; 1639 1640struct __nat 1641{ 1642#ifndef _LIBCPP_CXX03_LANG 1643 __nat() = delete; 1644 __nat(const __nat&) = delete; 1645 __nat& operator=(const __nat&) = delete; 1646 ~__nat() = delete; 1647#endif 1648}; 1649 1650template <class _Tp> 1651struct __align_type 1652{ 1653 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1654 typedef _Tp type; 1655}; 1656 1657struct __struct_double {long double __lx;}; 1658struct __struct_double4 {double __lx[4];}; 1659 1660typedef 1661 __type_list<__align_type<unsigned char>, 1662 __type_list<__align_type<unsigned short>, 1663 __type_list<__align_type<unsigned int>, 1664 __type_list<__align_type<unsigned long>, 1665 __type_list<__align_type<unsigned long long>, 1666 __type_list<__align_type<double>, 1667 __type_list<__align_type<long double>, 1668 __type_list<__align_type<__struct_double>, 1669 __type_list<__align_type<__struct_double4>, 1670 __type_list<__align_type<int*>, 1671 __nat 1672 > > > > > > > > > > __all_types; 1673 1674template <size_t _Align> 1675struct _ALIGNAS(_Align) __fallback_overaligned {}; 1676 1677template <class _TL, size_t _Align> struct __find_pod; 1678 1679template <class _Hp, size_t _Align> 1680struct __find_pod<__type_list<_Hp, __nat>, _Align> 1681{ 1682 typedef typename conditional< 1683 _Align == _Hp::value, 1684 typename _Hp::type, 1685 __fallback_overaligned<_Align> 1686 >::type type; 1687}; 1688 1689template <class _Hp, class _Tp, size_t _Align> 1690struct __find_pod<__type_list<_Hp, _Tp>, _Align> 1691{ 1692 typedef typename conditional< 1693 _Align == _Hp::value, 1694 typename _Hp::type, 1695 typename __find_pod<_Tp, _Align>::type 1696 >::type type; 1697}; 1698 1699template <class _TL, size_t _Len> struct __find_max_align; 1700 1701template <class _Hp, size_t _Len> 1702struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 1703 1704template <size_t _Len, size_t _A1, size_t _A2> 1705struct __select_align 1706{ 1707private: 1708 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 1709 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 1710public: 1711 static const size_t value = _Len < __max ? __min : __max; 1712}; 1713 1714template <class _Hp, class _Tp, size_t _Len> 1715struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 1716 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 1717 1718template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1719struct _LIBCPP_TEMPLATE_VIS aligned_storage 1720{ 1721 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 1722 union type 1723 { 1724 _Aligner __align; 1725 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 1726 }; 1727}; 1728 1729#if _LIBCPP_STD_VER > 11 1730template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1731 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 1732#endif 1733 1734#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 1735template <size_t _Len>\ 1736struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 1737{\ 1738 struct _ALIGNAS(n) type\ 1739 {\ 1740 unsigned char __lx[(_Len + n - 1)/n * n];\ 1741 };\ 1742} 1743 1744_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 1745_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 1746_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 1747_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 1748_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 1749_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 1750_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 1751_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 1752_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 1753_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 1754_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 1755_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 1756_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 1757_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 1758// PE/COFF does not support alignment beyond 8192 (=0x2000) 1759#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1760_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 1761#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1762 1763#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 1764 1765 1766// aligned_union 1767 1768template <size_t _I0, size_t ..._In> 1769struct __static_max; 1770 1771template <size_t _I0> 1772struct __static_max<_I0> 1773{ 1774 static const size_t value = _I0; 1775}; 1776 1777template <size_t _I0, size_t _I1, size_t ..._In> 1778struct __static_max<_I0, _I1, _In...> 1779{ 1780 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 1781 __static_max<_I1, _In...>::value; 1782}; 1783 1784template <size_t _Len, class _Type0, class ..._Types> 1785struct aligned_union 1786{ 1787 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 1788 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 1789 static const size_t __len = __static_max<_Len, sizeof(_Type0), 1790 sizeof(_Types)...>::value; 1791 typedef typename aligned_storage<__len, alignment_value>::type type; 1792}; 1793 1794#if _LIBCPP_STD_VER > 11 1795template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 1796#endif 1797 1798template <class _Tp> 1799struct __numeric_type 1800{ 1801 static void __test(...); 1802 static float __test(float); 1803 static double __test(char); 1804 static double __test(int); 1805 static double __test(unsigned); 1806 static double __test(long); 1807 static double __test(unsigned long); 1808 static double __test(long long); 1809 static double __test(unsigned long long); 1810 static double __test(double); 1811 static long double __test(long double); 1812 1813 typedef decltype(__test(declval<_Tp>())) type; 1814 static const bool value = _IsNotSame<type, void>::value; 1815}; 1816 1817template <> 1818struct __numeric_type<void> 1819{ 1820 static const bool value = true; 1821}; 1822 1823// __promote 1824 1825template <class _A1, class _A2 = void, class _A3 = void, 1826 bool = __numeric_type<_A1>::value && 1827 __numeric_type<_A2>::value && 1828 __numeric_type<_A3>::value> 1829class __promote_imp 1830{ 1831public: 1832 static const bool value = false; 1833}; 1834 1835template <class _A1, class _A2, class _A3> 1836class __promote_imp<_A1, _A2, _A3, true> 1837{ 1838private: 1839 typedef typename __promote_imp<_A1>::type __type1; 1840 typedef typename __promote_imp<_A2>::type __type2; 1841 typedef typename __promote_imp<_A3>::type __type3; 1842public: 1843 typedef decltype(__type1() + __type2() + __type3()) type; 1844 static const bool value = true; 1845}; 1846 1847template <class _A1, class _A2> 1848class __promote_imp<_A1, _A2, void, true> 1849{ 1850private: 1851 typedef typename __promote_imp<_A1>::type __type1; 1852 typedef typename __promote_imp<_A2>::type __type2; 1853public: 1854 typedef decltype(__type1() + __type2()) type; 1855 static const bool value = true; 1856}; 1857 1858template <class _A1> 1859class __promote_imp<_A1, void, void, true> 1860{ 1861public: 1862 typedef typename __numeric_type<_A1>::type type; 1863 static const bool value = true; 1864}; 1865 1866template <class _A1, class _A2 = void, class _A3 = void> 1867class __promote : public __promote_imp<_A1, _A2, _A3> {}; 1868 1869// make_signed / make_unsigned 1870 1871typedef 1872 __type_list<signed char, 1873 __type_list<signed short, 1874 __type_list<signed int, 1875 __type_list<signed long, 1876 __type_list<signed long long, 1877#ifndef _LIBCPP_HAS_NO_INT128 1878 __type_list<__int128_t, 1879#endif 1880 __nat 1881#ifndef _LIBCPP_HAS_NO_INT128 1882 > 1883#endif 1884 > > > > > __signed_types; 1885 1886typedef 1887 __type_list<unsigned char, 1888 __type_list<unsigned short, 1889 __type_list<unsigned int, 1890 __type_list<unsigned long, 1891 __type_list<unsigned long long, 1892#ifndef _LIBCPP_HAS_NO_INT128 1893 __type_list<__uint128_t, 1894#endif 1895 __nat 1896#ifndef _LIBCPP_HAS_NO_INT128 1897 > 1898#endif 1899 > > > > > __unsigned_types; 1900 1901template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 1902 1903template <class _Hp, class _Tp, size_t _Size> 1904struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 1905{ 1906 typedef _LIBCPP_NODEBUG_TYPE _Hp type; 1907}; 1908 1909template <class _Hp, class _Tp, size_t _Size> 1910struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 1911{ 1912 typedef _LIBCPP_NODEBUG_TYPE typename __find_first<_Tp, _Size>::type type; 1913}; 1914 1915template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 1916 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 1917struct __apply_cv 1918{ 1919 typedef _LIBCPP_NODEBUG_TYPE _Up type; 1920}; 1921 1922template <class _Tp, class _Up> 1923struct __apply_cv<_Tp, _Up, true, false> 1924{ 1925 typedef _LIBCPP_NODEBUG_TYPE const _Up type; 1926}; 1927 1928template <class _Tp, class _Up> 1929struct __apply_cv<_Tp, _Up, false, true> 1930{ 1931 typedef volatile _Up type; 1932}; 1933 1934template <class _Tp, class _Up> 1935struct __apply_cv<_Tp, _Up, true, true> 1936{ 1937 typedef const volatile _Up type; 1938}; 1939 1940template <class _Tp, class _Up> 1941struct __apply_cv<_Tp&, _Up, false, false> 1942{ 1943 typedef _Up& type; 1944}; 1945 1946template <class _Tp, class _Up> 1947struct __apply_cv<_Tp&, _Up, true, false> 1948{ 1949 typedef const _Up& type; 1950}; 1951 1952template <class _Tp, class _Up> 1953struct __apply_cv<_Tp&, _Up, false, true> 1954{ 1955 typedef volatile _Up& type; 1956}; 1957 1958template <class _Tp, class _Up> 1959struct __apply_cv<_Tp&, _Up, true, true> 1960{ 1961 typedef const volatile _Up& type; 1962}; 1963 1964template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1965struct __make_signed {}; 1966 1967template <class _Tp> 1968struct __make_signed<_Tp, true> 1969{ 1970 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 1971}; 1972 1973template <> struct __make_signed<bool, true> {}; 1974template <> struct __make_signed< signed short, true> {typedef short type;}; 1975template <> struct __make_signed<unsigned short, true> {typedef short type;}; 1976template <> struct __make_signed< signed int, true> {typedef int type;}; 1977template <> struct __make_signed<unsigned int, true> {typedef int type;}; 1978template <> struct __make_signed< signed long, true> {typedef long type;}; 1979template <> struct __make_signed<unsigned long, true> {typedef long type;}; 1980template <> struct __make_signed< signed long long, true> {typedef long long type;}; 1981template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 1982#ifndef _LIBCPP_HAS_NO_INT128 1983template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 1984template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 1985#endif 1986 1987template <class _Tp> 1988struct _LIBCPP_TEMPLATE_VIS make_signed 1989{ 1990 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 1991}; 1992 1993#if _LIBCPP_STD_VER > 11 1994template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 1995#endif 1996 1997template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1998struct __make_unsigned {}; 1999 2000template <class _Tp> 2001struct __make_unsigned<_Tp, true> 2002{ 2003 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2004}; 2005 2006template <> struct __make_unsigned<bool, true> {}; 2007template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2008template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2009template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2010template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2011template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2012template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2013template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2014template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2015#ifndef _LIBCPP_HAS_NO_INT128 2016template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2017template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2018#endif 2019 2020template <class _Tp> 2021struct _LIBCPP_TEMPLATE_VIS make_unsigned 2022{ 2023 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2024}; 2025 2026#if _LIBCPP_STD_VER > 11 2027template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2028#endif 2029 2030template <class _Tp, class _Up, class = void> 2031struct __common_type2_imp {}; 2032 2033template <class _Tp, class _Up> 2034struct __common_type2_imp<_Tp, _Up, 2035 typename __void_t<decltype( 2036 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2037 )>::type> 2038{ 2039 typedef _LIBCPP_NODEBUG_TYPE typename decay<decltype( 2040 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2041 )>::type type; 2042}; 2043 2044template <class, class = void> 2045struct __common_type_impl {}; 2046 2047// Clang provides variadic templates in C++03 as an extension. 2048#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2049# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2050template <class... Tp> 2051struct __common_types; 2052template <class... _Tp> 2053struct _LIBCPP_TEMPLATE_VIS common_type; 2054#else 2055# define _LIBCPP_OPTIONAL_PACK(...) 2056struct __no_arg; 2057template <class _Tp, class _Up, class = __no_arg> 2058struct __common_types; 2059template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2060 class _Unused = __no_arg> 2061struct common_type { 2062 static_assert(sizeof(_Unused) == 0, 2063 "common_type accepts at most 3 arguments in C++03"); 2064}; 2065#endif // _LIBCPP_CXX03_LANG 2066 2067template <class _Tp, class _Up> 2068struct __common_type_impl< 2069 __common_types<_Tp, _Up>, 2070 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2071{ 2072 typedef typename common_type<_Tp, _Up>::type type; 2073}; 2074 2075template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2076struct __common_type_impl< 2077 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2078 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2079 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2080 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2081}; 2082 2083// bullet 1 - sizeof...(Tp) == 0 2084 2085template <> 2086struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2087 2088// bullet 2 - sizeof...(Tp) == 1 2089 2090template <class _Tp> 2091struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2092 : public common_type<_Tp, _Tp> {}; 2093 2094// bullet 3 - sizeof...(Tp) == 2 2095 2096template <class _Tp, class _Up> 2097struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2098 : conditional< 2099 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2100 __common_type2_imp<_Tp, _Up>, 2101 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2102 >::type 2103{}; 2104 2105// bullet 4 - sizeof...(Tp) > 2 2106 2107template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2108struct _LIBCPP_TEMPLATE_VIS 2109 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2110 : __common_type_impl< 2111 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2112 2113#undef _LIBCPP_OPTIONAL_PACK 2114 2115#if _LIBCPP_STD_VER > 11 2116template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2117#endif 2118 2119// is_assignable 2120 2121template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 2122 2123template <class _Tp, class _Arg> 2124typename __select_2nd<decltype((_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>())), true_type>::type 2125__is_assignable_test(int); 2126 2127template <class, class> 2128false_type __is_assignable_test(...); 2129 2130 2131template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2132struct __is_assignable_imp 2133 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2134 2135template <class _Tp, class _Arg> 2136struct __is_assignable_imp<_Tp, _Arg, true> 2137 : public false_type 2138{ 2139}; 2140 2141template <class _Tp, class _Arg> 2142struct is_assignable 2143 : public __is_assignable_imp<_Tp, _Arg> {}; 2144 2145#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2146template <class _Tp, class _Arg> 2147_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v 2148 = is_assignable<_Tp, _Arg>::value; 2149#endif 2150 2151// is_copy_assignable 2152 2153template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2154 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2155 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2156 2157#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2158template <class _Tp> 2159_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_assignable_v 2160 = is_copy_assignable<_Tp>::value; 2161#endif 2162 2163// is_move_assignable 2164 2165template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2166 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2167 typename add_rvalue_reference<_Tp>::type> {}; 2168 2169#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2170template <class _Tp> 2171_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_assignable_v 2172 = is_move_assignable<_Tp>::value; 2173#endif 2174 2175// is_destructible 2176 2177// if it's a reference, return true 2178// if it's a function, return false 2179// if it's void, return false 2180// if it's an array of unknown bound, return false 2181// Otherwise, return "std::declval<_Up&>().~_Up()" is well-formed 2182// where _Up is remove_all_extents<_Tp>::type 2183 2184template <class> 2185struct __is_destructible_apply { typedef int type; }; 2186 2187template <typename _Tp> 2188struct __is_destructor_wellformed { 2189 template <typename _Tp1> 2190 static char __test ( 2191 typename __is_destructible_apply<decltype(_VSTD::declval<_Tp1&>().~_Tp1())>::type 2192 ); 2193 2194 template <typename _Tp1> 2195 static __two __test (...); 2196 2197 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2198}; 2199 2200template <class _Tp, bool> 2201struct __destructible_imp; 2202 2203template <class _Tp> 2204struct __destructible_imp<_Tp, false> 2205 : public _VSTD::integral_constant<bool, 2206 __is_destructor_wellformed<typename _VSTD::remove_all_extents<_Tp>::type>::value> {}; 2207 2208template <class _Tp> 2209struct __destructible_imp<_Tp, true> 2210 : public _VSTD::true_type {}; 2211 2212template <class _Tp, bool> 2213struct __destructible_false; 2214 2215template <class _Tp> 2216struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, _VSTD::is_reference<_Tp>::value> {}; 2217 2218template <class _Tp> 2219struct __destructible_false<_Tp, true> : public _VSTD::false_type {}; 2220 2221template <class _Tp> 2222struct is_destructible 2223 : public __destructible_false<_Tp, _VSTD::is_function<_Tp>::value> {}; 2224 2225template <class _Tp> 2226struct is_destructible<_Tp[]> 2227 : public _VSTD::false_type {}; 2228 2229template <> 2230struct is_destructible<void> 2231 : public _VSTD::false_type {}; 2232 2233#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2234template <class _Tp> 2235_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v 2236 = is_destructible<_Tp>::value; 2237#endif 2238 2239// move 2240 2241template <class _Tp> 2242inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2243typename remove_reference<_Tp>::type&& 2244move(_Tp&& __t) _NOEXCEPT 2245{ 2246 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 2247 return static_cast<_Up&&>(__t); 2248} 2249 2250template <class _Tp> 2251inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2252_Tp&& 2253forward(typename remove_reference<_Tp>::type& __t) _NOEXCEPT 2254{ 2255 return static_cast<_Tp&&>(__t); 2256} 2257 2258template <class _Tp> 2259inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2260_Tp&& 2261forward(typename remove_reference<_Tp>::type&& __t) _NOEXCEPT 2262{ 2263 static_assert(!is_lvalue_reference<_Tp>::value, 2264 "can not forward an rvalue as an lvalue"); 2265 return static_cast<_Tp&&>(__t); 2266} 2267 2268template <class _Tp> 2269inline _LIBCPP_INLINE_VISIBILITY 2270typename decay<_Tp>::type 2271__decay_copy(_Tp&& __t) 2272{ 2273 return _VSTD::forward<_Tp>(__t); 2274} 2275 2276template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2277struct __member_pointer_traits_imp 2278{ 2279}; 2280 2281template <class _Rp, class _Class, class ..._Param> 2282struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 2283{ 2284 typedef _Class _ClassType; 2285 typedef _Rp _ReturnType; 2286 typedef _Rp (_FnType) (_Param...); 2287}; 2288 2289template <class _Rp, class _Class, class ..._Param> 2290struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 2291{ 2292 typedef _Class _ClassType; 2293 typedef _Rp _ReturnType; 2294 typedef _Rp (_FnType) (_Param..., ...); 2295}; 2296 2297template <class _Rp, class _Class, class ..._Param> 2298struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 2299{ 2300 typedef _Class const _ClassType; 2301 typedef _Rp _ReturnType; 2302 typedef _Rp (_FnType) (_Param...); 2303}; 2304 2305template <class _Rp, class _Class, class ..._Param> 2306struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 2307{ 2308 typedef _Class const _ClassType; 2309 typedef _Rp _ReturnType; 2310 typedef _Rp (_FnType) (_Param..., ...); 2311}; 2312 2313template <class _Rp, class _Class, class ..._Param> 2314struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 2315{ 2316 typedef _Class volatile _ClassType; 2317 typedef _Rp _ReturnType; 2318 typedef _Rp (_FnType) (_Param...); 2319}; 2320 2321template <class _Rp, class _Class, class ..._Param> 2322struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 2323{ 2324 typedef _Class volatile _ClassType; 2325 typedef _Rp _ReturnType; 2326 typedef _Rp (_FnType) (_Param..., ...); 2327}; 2328 2329template <class _Rp, class _Class, class ..._Param> 2330struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 2331{ 2332 typedef _Class const volatile _ClassType; 2333 typedef _Rp _ReturnType; 2334 typedef _Rp (_FnType) (_Param...); 2335}; 2336 2337template <class _Rp, class _Class, class ..._Param> 2338struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2339{ 2340 typedef _Class const volatile _ClassType; 2341 typedef _Rp _ReturnType; 2342 typedef _Rp (_FnType) (_Param..., ...); 2343}; 2344 2345#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2346 2347template <class _Rp, class _Class, class ..._Param> 2348struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 2349{ 2350 typedef _Class& _ClassType; 2351 typedef _Rp _ReturnType; 2352 typedef _Rp (_FnType) (_Param...); 2353}; 2354 2355template <class _Rp, class _Class, class ..._Param> 2356struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 2357{ 2358 typedef _Class& _ClassType; 2359 typedef _Rp _ReturnType; 2360 typedef _Rp (_FnType) (_Param..., ...); 2361}; 2362 2363template <class _Rp, class _Class, class ..._Param> 2364struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 2365{ 2366 typedef _Class const& _ClassType; 2367 typedef _Rp _ReturnType; 2368 typedef _Rp (_FnType) (_Param...); 2369}; 2370 2371template <class _Rp, class _Class, class ..._Param> 2372struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 2373{ 2374 typedef _Class const& _ClassType; 2375 typedef _Rp _ReturnType; 2376 typedef _Rp (_FnType) (_Param..., ...); 2377}; 2378 2379template <class _Rp, class _Class, class ..._Param> 2380struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 2381{ 2382 typedef _Class volatile& _ClassType; 2383 typedef _Rp _ReturnType; 2384 typedef _Rp (_FnType) (_Param...); 2385}; 2386 2387template <class _Rp, class _Class, class ..._Param> 2388struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 2389{ 2390 typedef _Class volatile& _ClassType; 2391 typedef _Rp _ReturnType; 2392 typedef _Rp (_FnType) (_Param..., ...); 2393}; 2394 2395template <class _Rp, class _Class, class ..._Param> 2396struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 2397{ 2398 typedef _Class const volatile& _ClassType; 2399 typedef _Rp _ReturnType; 2400 typedef _Rp (_FnType) (_Param...); 2401}; 2402 2403template <class _Rp, class _Class, class ..._Param> 2404struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 2405{ 2406 typedef _Class const volatile& _ClassType; 2407 typedef _Rp _ReturnType; 2408 typedef _Rp (_FnType) (_Param..., ...); 2409}; 2410 2411template <class _Rp, class _Class, class ..._Param> 2412struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 2413{ 2414 typedef _Class&& _ClassType; 2415 typedef _Rp _ReturnType; 2416 typedef _Rp (_FnType) (_Param...); 2417}; 2418 2419template <class _Rp, class _Class, class ..._Param> 2420struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 2421{ 2422 typedef _Class&& _ClassType; 2423 typedef _Rp _ReturnType; 2424 typedef _Rp (_FnType) (_Param..., ...); 2425}; 2426 2427template <class _Rp, class _Class, class ..._Param> 2428struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 2429{ 2430 typedef _Class const&& _ClassType; 2431 typedef _Rp _ReturnType; 2432 typedef _Rp (_FnType) (_Param...); 2433}; 2434 2435template <class _Rp, class _Class, class ..._Param> 2436struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 2437{ 2438 typedef _Class const&& _ClassType; 2439 typedef _Rp _ReturnType; 2440 typedef _Rp (_FnType) (_Param..., ...); 2441}; 2442 2443template <class _Rp, class _Class, class ..._Param> 2444struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 2445{ 2446 typedef _Class volatile&& _ClassType; 2447 typedef _Rp _ReturnType; 2448 typedef _Rp (_FnType) (_Param...); 2449}; 2450 2451template <class _Rp, class _Class, class ..._Param> 2452struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 2453{ 2454 typedef _Class volatile&& _ClassType; 2455 typedef _Rp _ReturnType; 2456 typedef _Rp (_FnType) (_Param..., ...); 2457}; 2458 2459template <class _Rp, class _Class, class ..._Param> 2460struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 2461{ 2462 typedef _Class const volatile&& _ClassType; 2463 typedef _Rp _ReturnType; 2464 typedef _Rp (_FnType) (_Param...); 2465}; 2466 2467template <class _Rp, class _Class, class ..._Param> 2468struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 2469{ 2470 typedef _Class const volatile&& _ClassType; 2471 typedef _Rp _ReturnType; 2472 typedef _Rp (_FnType) (_Param..., ...); 2473}; 2474 2475#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2476 2477 2478template <class _Rp, class _Class> 2479struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 2480{ 2481 typedef _Class _ClassType; 2482 typedef _Rp _ReturnType; 2483}; 2484 2485template <class _MP> 2486struct __member_pointer_traits 2487 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 2488 is_member_function_pointer<_MP>::value, 2489 is_member_object_pointer<_MP>::value> 2490{ 2491// typedef ... _ClassType; 2492// typedef ... _ReturnType; 2493// typedef ... _FnType; 2494}; 2495 2496 2497template <class _DecayedFp> 2498struct __member_pointer_class_type {}; 2499 2500template <class _Ret, class _ClassType> 2501struct __member_pointer_class_type<_Ret _ClassType::*> { 2502 typedef _ClassType type; 2503}; 2504 2505// result_of 2506 2507template <class _Callable> class result_of; 2508 2509#ifdef _LIBCPP_HAS_NO_VARIADICS 2510 2511template <class _Fn, bool, bool> 2512class __result_of 2513{ 2514}; 2515 2516template <class _Fn> 2517class __result_of<_Fn(), true, false> 2518{ 2519public: 2520 typedef decltype(declval<_Fn>()()) type; 2521}; 2522 2523template <class _Fn, class _A0> 2524class __result_of<_Fn(_A0), true, false> 2525{ 2526public: 2527 typedef decltype(declval<_Fn>()(declval<_A0>())) type; 2528}; 2529 2530template <class _Fn, class _A0, class _A1> 2531class __result_of<_Fn(_A0, _A1), true, false> 2532{ 2533public: 2534 typedef decltype(declval<_Fn>()(declval<_A0>(), declval<_A1>())) type; 2535}; 2536 2537template <class _Fn, class _A0, class _A1, class _A2> 2538class __result_of<_Fn(_A0, _A1, _A2), true, false> 2539{ 2540public: 2541 typedef decltype(declval<_Fn>()(declval<_A0>(), declval<_A1>(), declval<_A2>())) type; 2542}; 2543 2544template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 2545struct __result_of_mp; 2546 2547// member function pointer 2548 2549template <class _MP, class _Tp> 2550struct __result_of_mp<_MP, _Tp, true> 2551 : public __identity<typename __member_pointer_traits<_MP>::_ReturnType> 2552{ 2553}; 2554 2555// member data pointer 2556 2557template <class _MP, class _Tp, bool> 2558struct __result_of_mdp; 2559 2560template <class _Rp, class _Class, class _Tp> 2561struct __result_of_mdp<_Rp _Class::*, _Tp, false> 2562{ 2563 typedef typename __apply_cv<decltype(*_VSTD::declval<_Tp>()), _Rp>::type& type; 2564}; 2565 2566template <class _Rp, class _Class, class _Tp> 2567struct __result_of_mdp<_Rp _Class::*, _Tp, true> 2568{ 2569 typedef typename __apply_cv<_Tp, _Rp>::type& type; 2570}; 2571 2572template <class _Rp, class _Class, class _Tp> 2573struct __result_of_mp<_Rp _Class::*, _Tp, false> 2574 : public __result_of_mdp<_Rp _Class::*, _Tp, 2575 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 2576{ 2577}; 2578 2579 2580 2581template <class _Fn, class _Tp> 2582class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 2583 : public __result_of_mp<typename remove_reference<_Fn>::type, 2584 _Tp, 2585 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2586{ 2587}; 2588 2589template <class _Fn, class _Tp, class _A0> 2590class __result_of<_Fn(_Tp, _A0), false, true> // _Fn must be member pointer 2591 : public __result_of_mp<typename remove_reference<_Fn>::type, 2592 _Tp, 2593 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2594{ 2595}; 2596 2597template <class _Fn, class _Tp, class _A0, class _A1> 2598class __result_of<_Fn(_Tp, _A0, _A1), false, true> // _Fn must be member pointer 2599 : public __result_of_mp<typename remove_reference<_Fn>::type, 2600 _Tp, 2601 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2602{ 2603}; 2604 2605template <class _Fn, class _Tp, class _A0, class _A1, class _A2> 2606class __result_of<_Fn(_Tp, _A0, _A1, _A2), false, true> // _Fn must be member pointer 2607 : public __result_of_mp<typename remove_reference<_Fn>::type, 2608 _Tp, 2609 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2610{ 2611}; 2612 2613// result_of 2614 2615template <class _Fn> 2616class _LIBCPP_TEMPLATE_VIS result_of<_Fn()> 2617 : public __result_of<_Fn(), 2618 is_class<typename remove_reference<_Fn>::type>::value || 2619 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2620 is_member_pointer<typename remove_reference<_Fn>::type>::value 2621 > 2622{ 2623}; 2624 2625template <class _Fn, class _A0> 2626class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_A0)> 2627 : public __result_of<_Fn(_A0), 2628 is_class<typename remove_reference<_Fn>::type>::value || 2629 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2630 is_member_pointer<typename remove_reference<_Fn>::type>::value 2631 > 2632{ 2633}; 2634 2635template <class _Fn, class _A0, class _A1> 2636class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_A0, _A1)> 2637 : public __result_of<_Fn(_A0, _A1), 2638 is_class<typename remove_reference<_Fn>::type>::value || 2639 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2640 is_member_pointer<typename remove_reference<_Fn>::type>::value 2641 > 2642{ 2643}; 2644 2645template <class _Fn, class _A0, class _A1, class _A2> 2646class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_A0, _A1, _A2)> 2647 : public __result_of<_Fn(_A0, _A1, _A2), 2648 is_class<typename remove_reference<_Fn>::type>::value || 2649 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2650 is_member_pointer<typename remove_reference<_Fn>::type>::value 2651 > 2652{ 2653}; 2654 2655#endif // _LIBCPP_HAS_NO_VARIADICS 2656 2657// template <class T, class... Args> struct is_constructible; 2658 2659namespace __is_construct 2660{ 2661struct __nat {}; 2662} 2663 2664#if !defined(_LIBCPP_CXX03_LANG) && (!__has_feature(is_constructible) || \ 2665 defined(_LIBCPP_TESTING_FALLBACK_IS_CONSTRUCTIBLE)) 2666 2667template <class _Tp, class... _Args> 2668struct __libcpp_is_constructible; 2669 2670template <class _To, class _From> 2671struct __is_invalid_base_to_derived_cast { 2672 static_assert(is_reference<_To>::value, "Wrong specialization"); 2673 using _RawFrom = __uncvref_t<_From>; 2674 using _RawTo = __uncvref_t<_To>; 2675 static const bool value = _And< 2676 _IsNotSame<_RawFrom, _RawTo>, 2677 is_base_of<_RawFrom, _RawTo>, 2678 _Not<__libcpp_is_constructible<_RawTo, _From>> 2679 >::value; 2680}; 2681 2682template <class _To, class _From> 2683struct __is_invalid_lvalue_to_rvalue_cast : false_type { 2684 static_assert(is_reference<_To>::value, "Wrong specialization"); 2685}; 2686 2687template <class _ToRef, class _FromRef> 2688struct __is_invalid_lvalue_to_rvalue_cast<_ToRef&&, _FromRef&> { 2689 using _RawFrom = __uncvref_t<_FromRef>; 2690 using _RawTo = __uncvref_t<_ToRef>; 2691 static const bool value = _And< 2692 _Not<is_function<_RawTo>>, 2693 _Or< 2694 _IsSame<_RawFrom, _RawTo>, 2695 is_base_of<_RawTo, _RawFrom>> 2696 >::value; 2697}; 2698 2699struct __is_constructible_helper 2700{ 2701 template <class _To> 2702 static void __eat(_To); 2703 2704 // This overload is needed to work around a Clang bug that disallows 2705 // static_cast<T&&>(e) for non-reference-compatible types. 2706 // Example: static_cast<int&&>(declval<double>()); 2707 // NOTE: The static_cast implementation below is required to support 2708 // classes with explicit conversion operators. 2709 template <class _To, class _From, 2710 class = decltype(__eat<_To>(_VSTD::declval<_From>()))> 2711 static true_type __test_cast(int); 2712 2713 template <class _To, class _From, 2714 class = decltype(static_cast<_To>(_VSTD::declval<_From>()))> 2715 static integral_constant<bool, 2716 !__is_invalid_base_to_derived_cast<_To, _From>::value && 2717 !__is_invalid_lvalue_to_rvalue_cast<_To, _From>::value 2718 > __test_cast(long); 2719 2720 template <class, class> 2721 static false_type __test_cast(...); 2722 2723 template <class _Tp, class ..._Args, 2724 class = decltype(_Tp(_VSTD::declval<_Args>()...))> 2725 static true_type __test_nary(int); 2726 template <class _Tp, class...> 2727 static false_type __test_nary(...); 2728 2729 template <class _Tp, class _A0, class = decltype(::new _Tp(_VSTD::declval<_A0>()))> 2730 static is_destructible<_Tp> __test_unary(int); 2731 template <class, class> 2732 static false_type __test_unary(...); 2733}; 2734 2735template <class _Tp, bool = is_void<_Tp>::value> 2736struct __is_default_constructible 2737 : decltype(__is_constructible_helper::__test_nary<_Tp>(0)) 2738{}; 2739 2740template <class _Tp> 2741struct __is_default_constructible<_Tp, true> : false_type {}; 2742 2743template <class _Tp> 2744struct __is_default_constructible<_Tp[], false> : false_type {}; 2745 2746template <class _Tp, size_t _Nx> 2747struct __is_default_constructible<_Tp[_Nx], false> 2748 : __is_default_constructible<typename remove_all_extents<_Tp>::type> {}; 2749 2750template <class _Tp, class... _Args> 2751struct __libcpp_is_constructible 2752{ 2753 static_assert(sizeof...(_Args) > 1, "Wrong specialization"); 2754 typedef decltype(__is_constructible_helper::__test_nary<_Tp, _Args...>(0)) 2755 type; 2756}; 2757 2758template <class _Tp> 2759struct __libcpp_is_constructible<_Tp> : __is_default_constructible<_Tp> {}; 2760 2761template <class _Tp, class _A0> 2762struct __libcpp_is_constructible<_Tp, _A0> 2763 : public decltype(__is_constructible_helper::__test_unary<_Tp, _A0>(0)) 2764{}; 2765 2766template <class _Tp, class _A0> 2767struct __libcpp_is_constructible<_Tp&, _A0> 2768 : public decltype(__is_constructible_helper:: 2769 __test_cast<_Tp&, _A0>(0)) 2770{}; 2771 2772template <class _Tp, class _A0> 2773struct __libcpp_is_constructible<_Tp&&, _A0> 2774 : public decltype(__is_constructible_helper:: 2775 __test_cast<_Tp&&, _A0>(0)) 2776{}; 2777 2778#endif 2779 2780#if __has_feature(is_constructible) 2781template <class _Tp, class ..._Args> 2782struct _LIBCPP_TEMPLATE_VIS is_constructible 2783 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 2784 {}; 2785#else 2786template <class _Tp, class... _Args> 2787struct _LIBCPP_TEMPLATE_VIS is_constructible 2788 : public __libcpp_is_constructible<_Tp, _Args...>::type {}; 2789#endif 2790 2791#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2792template <class _Tp, class ..._Args> 2793_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_constructible_v 2794 = is_constructible<_Tp, _Args...>::value; 2795#endif 2796 2797// is_default_constructible 2798 2799template <class _Tp> 2800struct _LIBCPP_TEMPLATE_VIS is_default_constructible 2801 : public is_constructible<_Tp> 2802 {}; 2803 2804#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2805template <class _Tp> 2806_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_default_constructible_v 2807 = is_default_constructible<_Tp>::value; 2808#endif 2809 2810#ifndef _LIBCPP_CXX03_LANG 2811// First of all, we can't implement this check in C++03 mode because the {} 2812// default initialization syntax isn't valid. 2813// Second, we implement the trait in a funny manner with two defaulted template 2814// arguments to workaround Clang's PR43454. 2815template <class _Tp> 2816void __test_implicit_default_constructible(_Tp); 2817 2818template <class _Tp, class = void, bool = is_default_constructible<_Tp>::value> 2819struct __is_implicitly_default_constructible 2820 : false_type 2821{ }; 2822 2823template <class _Tp> 2824struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true> 2825 : true_type 2826{ }; 2827 2828template <class _Tp> 2829struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false> 2830 : false_type 2831{ }; 2832#endif // !C++03 2833 2834// is_copy_constructible 2835 2836template <class _Tp> 2837struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 2838 : public is_constructible<_Tp, 2839 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2840 2841#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2842template <class _Tp> 2843_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_constructible_v 2844 = is_copy_constructible<_Tp>::value; 2845#endif 2846 2847// is_move_constructible 2848 2849template <class _Tp> 2850struct _LIBCPP_TEMPLATE_VIS is_move_constructible 2851 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2852 {}; 2853 2854#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2855template <class _Tp> 2856_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_constructible_v 2857 = is_move_constructible<_Tp>::value; 2858#endif 2859 2860// is_trivially_constructible 2861 2862#if __has_feature(is_trivially_constructible) || _GNUC_VER >= 501 2863 2864template <class _Tp, class... _Args> 2865struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 2866 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 2867{ 2868}; 2869 2870#else // !__has_feature(is_trivially_constructible) 2871 2872template <class _Tp, class... _Args> 2873struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 2874 : false_type 2875{ 2876}; 2877 2878template <class _Tp> 2879struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp> 2880#if __has_feature(has_trivial_constructor) || defined(_LIBCPP_COMPILER_GCC) 2881 : integral_constant<bool, __has_trivial_constructor(_Tp)> 2882#else 2883 : integral_constant<bool, is_scalar<_Tp>::value> 2884#endif 2885{ 2886}; 2887 2888template <class _Tp> 2889struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&&> 2890 : integral_constant<bool, is_scalar<_Tp>::value> 2891{ 2892}; 2893 2894template <class _Tp> 2895struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, const _Tp&> 2896 : integral_constant<bool, is_scalar<_Tp>::value> 2897{ 2898}; 2899 2900template <class _Tp> 2901struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&> 2902 : integral_constant<bool, is_scalar<_Tp>::value> 2903{ 2904}; 2905 2906#endif // !__has_feature(is_trivially_constructible) 2907 2908 2909#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2910template <class _Tp, class... _Args> 2911_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_constructible_v 2912 = is_trivially_constructible<_Tp, _Args...>::value; 2913#endif 2914 2915// is_trivially_default_constructible 2916 2917template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 2918 : public is_trivially_constructible<_Tp> 2919 {}; 2920 2921#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2922template <class _Tp> 2923_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_default_constructible_v 2924 = is_trivially_default_constructible<_Tp>::value; 2925#endif 2926 2927// is_trivially_copy_constructible 2928 2929template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 2930 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 2931 {}; 2932 2933#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2934template <class _Tp> 2935_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_constructible_v 2936 = is_trivially_copy_constructible<_Tp>::value; 2937#endif 2938 2939// is_trivially_move_constructible 2940 2941template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 2942 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2943 {}; 2944 2945#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2946template <class _Tp> 2947_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_constructible_v 2948 = is_trivially_move_constructible<_Tp>::value; 2949#endif 2950 2951// is_trivially_assignable 2952 2953#if __has_feature(is_trivially_assignable) || _GNUC_VER >= 501 2954 2955template <class _Tp, class _Arg> 2956struct is_trivially_assignable 2957 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 2958{ 2959}; 2960 2961#else // !__has_feature(is_trivially_assignable) 2962 2963template <class _Tp, class _Arg> 2964struct is_trivially_assignable 2965 : public false_type {}; 2966 2967template <class _Tp> 2968struct is_trivially_assignable<_Tp&, _Tp> 2969 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2970 2971template <class _Tp> 2972struct is_trivially_assignable<_Tp&, _Tp&> 2973 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2974 2975template <class _Tp> 2976struct is_trivially_assignable<_Tp&, const _Tp&> 2977 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2978 2979template <class _Tp> 2980struct is_trivially_assignable<_Tp&, _Tp&&> 2981 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2982 2983#endif // !__has_feature(is_trivially_assignable) 2984 2985#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2986template <class _Tp, class _Arg> 2987_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_assignable_v 2988 = is_trivially_assignable<_Tp, _Arg>::value; 2989#endif 2990 2991// is_trivially_copy_assignable 2992 2993template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 2994 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 2995 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2996 2997#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2998template <class _Tp> 2999_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_assignable_v 3000 = is_trivially_copy_assignable<_Tp>::value; 3001#endif 3002 3003// is_trivially_move_assignable 3004 3005template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3006 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3007 typename add_rvalue_reference<_Tp>::type> 3008 {}; 3009 3010#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3011template <class _Tp> 3012_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_assignable_v 3013 = is_trivially_move_assignable<_Tp>::value; 3014#endif 3015 3016// is_trivially_destructible 3017 3018#if __has_keyword(__is_trivially_destructible) 3019 3020template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3021 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3022 3023#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3024 3025template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3026 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3027 3028#else 3029 3030template <class _Tp> struct __libcpp_trivial_destructor 3031 : public integral_constant<bool, is_scalar<_Tp>::value || 3032 is_reference<_Tp>::value> {}; 3033 3034template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3035 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3036 3037template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3038 : public false_type {}; 3039 3040#endif 3041 3042#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3043template <class _Tp> 3044_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_destructible_v 3045 = is_trivially_destructible<_Tp>::value; 3046#endif 3047 3048// is_nothrow_constructible 3049 3050#if __has_keyword(__is_nothrow_constructible) 3051 3052template <class _Tp, class... _Args> 3053struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3054 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3055 3056#else 3057 3058template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3059 3060template <class _Tp, class... _Args> 3061struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3062 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3063{ 3064}; 3065 3066template <class _Tp> 3067void __implicit_conversion_to(_Tp) noexcept { } 3068 3069template <class _Tp, class _Arg> 3070struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3071 : public integral_constant<bool, noexcept(__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3072{ 3073}; 3074 3075template <class _Tp, bool _IsReference, class... _Args> 3076struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3077 : public false_type 3078{ 3079}; 3080 3081template <class _Tp, class... _Args> 3082struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3083 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3084{ 3085}; 3086 3087template <class _Tp, size_t _Ns> 3088struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3089 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3090{ 3091}; 3092 3093#endif // _LIBCPP_HAS_NO_NOEXCEPT 3094 3095 3096#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3097template <class _Tp, class ..._Args> 3098_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_constructible_v 3099 = is_nothrow_constructible<_Tp, _Args...>::value; 3100#endif 3101 3102// is_nothrow_default_constructible 3103 3104template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3105 : public is_nothrow_constructible<_Tp> 3106 {}; 3107 3108#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3109template <class _Tp> 3110_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_default_constructible_v 3111 = is_nothrow_default_constructible<_Tp>::value; 3112#endif 3113 3114// is_nothrow_copy_constructible 3115 3116template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3117 : public is_nothrow_constructible<_Tp, 3118 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3119 3120#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3121template <class _Tp> 3122_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_constructible_v 3123 = is_nothrow_copy_constructible<_Tp>::value; 3124#endif 3125 3126// is_nothrow_move_constructible 3127 3128template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3129 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3130 {}; 3131 3132#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3133template <class _Tp> 3134_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_constructible_v 3135 = is_nothrow_move_constructible<_Tp>::value; 3136#endif 3137 3138// is_nothrow_assignable 3139 3140#if __has_keyword(__is_nothrow_assignable) 3141 3142template <class _Tp, class _Arg> 3143struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3144 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3145 3146#else 3147 3148template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3149 3150template <class _Tp, class _Arg> 3151struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3152 : public false_type 3153{ 3154}; 3155 3156template <class _Tp, class _Arg> 3157struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3158 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>()) > 3159{ 3160}; 3161 3162template <class _Tp, class _Arg> 3163struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3164 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3165{ 3166}; 3167 3168#endif // _LIBCPP_HAS_NO_NOEXCEPT 3169 3170#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3171template <class _Tp, class _Arg> 3172_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_assignable_v 3173 = is_nothrow_assignable<_Tp, _Arg>::value; 3174#endif 3175 3176// is_nothrow_copy_assignable 3177 3178template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3179 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3180 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3181 3182#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3183template <class _Tp> 3184_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_assignable_v 3185 = is_nothrow_copy_assignable<_Tp>::value; 3186#endif 3187 3188// is_nothrow_move_assignable 3189 3190template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 3191 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3192 typename add_rvalue_reference<_Tp>::type> 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_nothrow_move_assignable_v 3198 = is_nothrow_move_assignable<_Tp>::value; 3199#endif 3200 3201// is_nothrow_destructible 3202 3203#if !defined(_LIBCPP_CXX03_LANG) 3204 3205template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3206 3207template <class _Tp> 3208struct __libcpp_is_nothrow_destructible<false, _Tp> 3209 : public false_type 3210{ 3211}; 3212 3213template <class _Tp> 3214struct __libcpp_is_nothrow_destructible<true, _Tp> 3215 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>().~_Tp()) > 3216{ 3217}; 3218 3219template <class _Tp> 3220struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3221 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3222{ 3223}; 3224 3225template <class _Tp, size_t _Ns> 3226struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3227 : public is_nothrow_destructible<_Tp> 3228{ 3229}; 3230 3231template <class _Tp> 3232struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3233 : public true_type 3234{ 3235}; 3236 3237template <class _Tp> 3238struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3239 : public true_type 3240{ 3241}; 3242 3243#else 3244 3245template <class _Tp> struct __libcpp_nothrow_destructor 3246 : public integral_constant<bool, is_scalar<_Tp>::value || 3247 is_reference<_Tp>::value> {}; 3248 3249template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3250 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3251 3252template <class _Tp> 3253struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3254 : public false_type {}; 3255 3256#endif 3257 3258#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3259template <class _Tp> 3260_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_destructible_v 3261 = is_nothrow_destructible<_Tp>::value; 3262#endif 3263 3264// is_pod 3265 3266#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3267 3268template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3269 : public integral_constant<bool, __is_pod(_Tp)> {}; 3270 3271#else 3272 3273template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3274 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3275 is_trivially_copy_constructible<_Tp>::value && 3276 is_trivially_copy_assignable<_Tp>::value && 3277 is_trivially_destructible<_Tp>::value> {}; 3278 3279#endif 3280 3281#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3282template <class _Tp> 3283_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pod_v 3284 = is_pod<_Tp>::value; 3285#endif 3286 3287// is_literal_type; 3288 3289template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_literal_type 3290 : public integral_constant<bool, __is_literal_type(_Tp)> 3291 {}; 3292 3293#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3294template <class _Tp> 3295_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_literal_type_v 3296 = is_literal_type<_Tp>::value; 3297#endif 3298 3299// is_standard_layout; 3300 3301template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3302#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3303 : public integral_constant<bool, __is_standard_layout(_Tp)> 3304#else 3305 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3306#endif 3307 {}; 3308 3309#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3310template <class _Tp> 3311_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_standard_layout_v 3312 = is_standard_layout<_Tp>::value; 3313#endif 3314 3315// is_trivially_copyable; 3316 3317template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3318#if __has_feature(is_trivially_copyable) 3319 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3320#elif _GNUC_VER >= 501 3321 : public integral_constant<bool, !is_volatile<_Tp>::value && __is_trivially_copyable(_Tp)> 3322#else 3323 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3324#endif 3325 {}; 3326 3327#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3328template <class _Tp> 3329_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copyable_v 3330 = is_trivially_copyable<_Tp>::value; 3331#endif 3332 3333// is_trivial; 3334 3335template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3336#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3337 : public integral_constant<bool, __is_trivial(_Tp)> 3338#else 3339 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3340 is_trivially_default_constructible<_Tp>::value> 3341#endif 3342 {}; 3343 3344#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3345template <class _Tp> 3346_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivial_v 3347 = is_trivial<_Tp>::value; 3348#endif 3349 3350template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3351template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3352template <class _Tp> struct __is_reference_wrapper 3353 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3354 3355#ifndef _LIBCPP_CXX03_LANG 3356 3357template <class _Fp, class _A0, 3358 class _DecayFp = typename decay<_Fp>::type, 3359 class _DecayA0 = typename decay<_A0>::type, 3360 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3361using __enable_if_bullet1 = typename enable_if 3362 < 3363 is_member_function_pointer<_DecayFp>::value 3364 && is_base_of<_ClassT, _DecayA0>::value 3365 >::type; 3366 3367template <class _Fp, class _A0, 3368 class _DecayFp = typename decay<_Fp>::type, 3369 class _DecayA0 = typename decay<_A0>::type> 3370using __enable_if_bullet2 = typename enable_if 3371 < 3372 is_member_function_pointer<_DecayFp>::value 3373 && __is_reference_wrapper<_DecayA0>::value 3374 >::type; 3375 3376template <class _Fp, class _A0, 3377 class _DecayFp = typename decay<_Fp>::type, 3378 class _DecayA0 = typename decay<_A0>::type, 3379 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3380using __enable_if_bullet3 = typename enable_if 3381 < 3382 is_member_function_pointer<_DecayFp>::value 3383 && !is_base_of<_ClassT, _DecayA0>::value 3384 && !__is_reference_wrapper<_DecayA0>::value 3385 >::type; 3386 3387template <class _Fp, class _A0, 3388 class _DecayFp = typename decay<_Fp>::type, 3389 class _DecayA0 = typename decay<_A0>::type, 3390 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3391using __enable_if_bullet4 = typename enable_if 3392 < 3393 is_member_object_pointer<_DecayFp>::value 3394 && is_base_of<_ClassT, _DecayA0>::value 3395 >::type; 3396 3397template <class _Fp, class _A0, 3398 class _DecayFp = typename decay<_Fp>::type, 3399 class _DecayA0 = typename decay<_A0>::type> 3400using __enable_if_bullet5 = typename enable_if 3401 < 3402 is_member_object_pointer<_DecayFp>::value 3403 && __is_reference_wrapper<_DecayA0>::value 3404 >::type; 3405 3406template <class _Fp, class _A0, 3407 class _DecayFp = typename decay<_Fp>::type, 3408 class _DecayA0 = typename decay<_A0>::type, 3409 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3410using __enable_if_bullet6 = typename enable_if 3411 < 3412 is_member_object_pointer<_DecayFp>::value 3413 && !is_base_of<_ClassT, _DecayA0>::value 3414 && !__is_reference_wrapper<_DecayA0>::value 3415 >::type; 3416 3417// __invoke forward declarations 3418 3419// fall back - none of the bullets 3420 3421#define _LIBCPP_INVOKE_RETURN(...) \ 3422 noexcept(noexcept(__VA_ARGS__)) -> decltype(__VA_ARGS__) \ 3423 { return __VA_ARGS__; } 3424 3425template <class ..._Args> 3426auto __invoke(__any, _Args&& ...__args) -> __nat; 3427 3428template <class ..._Args> 3429auto __invoke_constexpr(__any, _Args&& ...__args) -> __nat; 3430 3431// bullets 1, 2 and 3 3432 3433template <class _Fp, class _A0, class ..._Args, 3434 class = __enable_if_bullet1<_Fp, _A0>> 3435inline _LIBCPP_INLINE_VISIBILITY 3436auto 3437__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3438_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3439 3440template <class _Fp, class _A0, class ..._Args, 3441 class = __enable_if_bullet1<_Fp, _A0>> 3442inline _LIBCPP_INLINE_VISIBILITY 3443_LIBCPP_CONSTEXPR auto 3444__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3445_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3446 3447template <class _Fp, class _A0, class ..._Args, 3448 class = __enable_if_bullet2<_Fp, _A0>> 3449inline _LIBCPP_INLINE_VISIBILITY 3450auto 3451__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3452_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3453 3454template <class _Fp, class _A0, class ..._Args, 3455 class = __enable_if_bullet2<_Fp, _A0>> 3456inline _LIBCPP_INLINE_VISIBILITY 3457_LIBCPP_CONSTEXPR auto 3458__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3459_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3460 3461template <class _Fp, class _A0, class ..._Args, 3462 class = __enable_if_bullet3<_Fp, _A0>> 3463inline _LIBCPP_INLINE_VISIBILITY 3464auto 3465__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3466_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3467 3468template <class _Fp, class _A0, class ..._Args, 3469 class = __enable_if_bullet3<_Fp, _A0>> 3470inline _LIBCPP_INLINE_VISIBILITY 3471_LIBCPP_CONSTEXPR auto 3472__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3473_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3474 3475// bullets 4, 5 and 6 3476 3477template <class _Fp, class _A0, 3478 class = __enable_if_bullet4<_Fp, _A0>> 3479inline _LIBCPP_INLINE_VISIBILITY 3480auto 3481__invoke(_Fp&& __f, _A0&& __a0) 3482_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3483 3484template <class _Fp, class _A0, 3485 class = __enable_if_bullet4<_Fp, _A0>> 3486inline _LIBCPP_INLINE_VISIBILITY 3487_LIBCPP_CONSTEXPR auto 3488__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3489_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3490 3491template <class _Fp, class _A0, 3492 class = __enable_if_bullet5<_Fp, _A0>> 3493inline _LIBCPP_INLINE_VISIBILITY 3494auto 3495__invoke(_Fp&& __f, _A0&& __a0) 3496_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3497 3498template <class _Fp, class _A0, 3499 class = __enable_if_bullet5<_Fp, _A0>> 3500inline _LIBCPP_INLINE_VISIBILITY 3501_LIBCPP_CONSTEXPR auto 3502__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3503_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3504 3505template <class _Fp, class _A0, 3506 class = __enable_if_bullet6<_Fp, _A0>> 3507inline _LIBCPP_INLINE_VISIBILITY 3508auto 3509__invoke(_Fp&& __f, _A0&& __a0) 3510_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3511 3512template <class _Fp, class _A0, 3513 class = __enable_if_bullet6<_Fp, _A0>> 3514inline _LIBCPP_INLINE_VISIBILITY 3515_LIBCPP_CONSTEXPR auto 3516__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3517_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3518 3519// bullet 7 3520 3521template <class _Fp, class ..._Args> 3522inline _LIBCPP_INLINE_VISIBILITY 3523auto 3524__invoke(_Fp&& __f, _Args&& ...__args) 3525_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3526 3527template <class _Fp, class ..._Args> 3528inline _LIBCPP_INLINE_VISIBILITY 3529_LIBCPP_CONSTEXPR auto 3530__invoke_constexpr(_Fp&& __f, _Args&& ...__args) 3531_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3532 3533#undef _LIBCPP_INVOKE_RETURN 3534 3535// __invokable 3536template <class _Ret, class _Fp, class ..._Args> 3537struct __invokable_r 3538{ 3539 template <class _XFp, class ..._XArgs> 3540 static auto __try_call(int) -> decltype( 3541 _VSTD::__invoke(_VSTD::declval<_XFp>(), _VSTD::declval<_XArgs>()...)); 3542 template <class _XFp, class ..._XArgs> 3543 static __nat __try_call(...); 3544 3545 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3546 // or incomplete array types as required by the standard. 3547 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3548 3549 using type = 3550 typename conditional< 3551 _IsNotSame<_Result, __nat>::value, 3552 typename conditional< 3553 is_void<_Ret>::value, 3554 true_type, 3555 is_convertible<_Result, _Ret> 3556 >::type, 3557 false_type 3558 >::type; 3559 static const bool value = type::value; 3560}; 3561template <class _Fp, class ..._Args> 3562using __invokable = __invokable_r<void, _Fp, _Args...>; 3563 3564template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3565struct __nothrow_invokable_r_imp { 3566 static const bool value = false; 3567}; 3568 3569template <class _Ret, class _Fp, class ..._Args> 3570struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3571{ 3572 typedef __nothrow_invokable_r_imp _ThisT; 3573 3574 template <class _Tp> 3575 static void __test_noexcept(_Tp) noexcept; 3576 3577 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3578 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...))); 3579}; 3580 3581template <class _Ret, class _Fp, class ..._Args> 3582struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3583{ 3584 static const bool value = noexcept( 3585 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...)); 3586}; 3587 3588template <class _Ret, class _Fp, class ..._Args> 3589using __nothrow_invokable_r = 3590 __nothrow_invokable_r_imp< 3591 __invokable_r<_Ret, _Fp, _Args...>::value, 3592 is_void<_Ret>::value, 3593 _Ret, _Fp, _Args... 3594 >; 3595 3596template <class _Fp, class ..._Args> 3597using __nothrow_invokable = 3598 __nothrow_invokable_r_imp< 3599 __invokable<_Fp, _Args...>::value, 3600 true, void, _Fp, _Args... 3601 >; 3602 3603template <class _Fp, class ..._Args> 3604struct __invoke_of 3605 : public enable_if< 3606 __invokable<_Fp, _Args...>::value, 3607 typename __invokable_r<void, _Fp, _Args...>::_Result> 3608{ 3609}; 3610 3611// result_of 3612 3613template <class _Fp, class ..._Args> 3614class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 3615 : public __invoke_of<_Fp, _Args...> 3616{ 3617}; 3618 3619#if _LIBCPP_STD_VER > 11 3620template <class _Tp> using result_of_t = typename result_of<_Tp>::type; 3621#endif 3622 3623#if _LIBCPP_STD_VER > 14 3624 3625// invoke_result 3626 3627template <class _Fn, class... _Args> 3628struct _LIBCPP_TEMPLATE_VIS invoke_result 3629 : __invoke_of<_Fn, _Args...> 3630{ 3631}; 3632 3633template <class _Fn, class... _Args> 3634using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 3635 3636// is_invocable 3637 3638template <class _Fn, class ..._Args> 3639struct _LIBCPP_TEMPLATE_VIS is_invocable 3640 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 3641 3642template <class _Ret, class _Fn, class ..._Args> 3643struct _LIBCPP_TEMPLATE_VIS is_invocable_r 3644 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 3645 3646template <class _Fn, class ..._Args> 3647_LIBCPP_INLINE_VAR constexpr bool is_invocable_v 3648 = is_invocable<_Fn, _Args...>::value; 3649 3650template <class _Ret, class _Fn, class ..._Args> 3651_LIBCPP_INLINE_VAR constexpr bool is_invocable_r_v 3652 = is_invocable_r<_Ret, _Fn, _Args...>::value; 3653 3654// is_nothrow_invocable 3655 3656template <class _Fn, class ..._Args> 3657struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 3658 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 3659 3660template <class _Ret, class _Fn, class ..._Args> 3661struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 3662 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 3663 3664template <class _Fn, class ..._Args> 3665_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_v 3666 = is_nothrow_invocable<_Fn, _Args...>::value; 3667 3668template <class _Ret, class _Fn, class ..._Args> 3669_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_r_v 3670 = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 3671 3672#endif // _LIBCPP_STD_VER > 14 3673 3674#endif // !defined(_LIBCPP_CXX03_LANG) 3675 3676template <class _Tp> struct __is_swappable; 3677template <class _Tp> struct __is_nothrow_swappable; 3678 3679// swap, swap_ranges 3680 3681template <class _ForwardIterator1, class _ForwardIterator2> 3682inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3683_ForwardIterator2 3684swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2); 3685 3686template <class _Tp> 3687inline _LIBCPP_INLINE_VISIBILITY 3688#ifndef _LIBCPP_CXX03_LANG 3689typename enable_if 3690< 3691 is_move_constructible<_Tp>::value && 3692 is_move_assignable<_Tp>::value 3693>::type 3694#else 3695void 3696#endif 3697_LIBCPP_CONSTEXPR_AFTER_CXX17 3698swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 3699 is_nothrow_move_assignable<_Tp>::value) 3700{ 3701 _Tp __t(_VSTD::move(__x)); 3702 __x = _VSTD::move(__y); 3703 __y = _VSTD::move(__t); 3704} 3705 3706template<class _Tp, size_t _Np> 3707inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3708typename enable_if< 3709 __is_swappable<_Tp>::value 3710>::type 3711swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 3712{ 3713 _VSTD::swap_ranges(__a, __a + _Np, __b); 3714} 3715 3716template <class _ForwardIterator1, class _ForwardIterator2> 3717inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3718_ForwardIterator2 3719swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 3720{ 3721 for(; __first1 != __last1; ++__first1, (void) ++__first2) 3722 swap(*__first1, *__first2); 3723 return __first2; 3724} 3725 3726// iter_swap 3727 3728template <class _ForwardIterator1, class _ForwardIterator2> 3729inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3730void 3731iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b) 3732 // _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b))) 3733 _NOEXCEPT_(_NOEXCEPT_(swap(*_VSTD::declval<_ForwardIterator1>(), 3734 *_VSTD::declval<_ForwardIterator2>()))) 3735{ 3736 swap(*__a, *__b); 3737} 3738 3739// __swappable 3740 3741namespace __detail 3742{ 3743// ALL generic swap overloads MUST already have a declaration available at this point. 3744 3745template <class _Tp, class _Up = _Tp, 3746 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 3747struct __swappable_with 3748{ 3749 template <class _LHS, class _RHS> 3750 static decltype(swap(_VSTD::declval<_LHS>(), _VSTD::declval<_RHS>())) 3751 __test_swap(int); 3752 template <class, class> 3753 static __nat __test_swap(long); 3754 3755 // Extra parens are needed for the C++03 definition of decltype. 3756 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 3757 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 3758 3759 static const bool value = _IsNotSame<__swap1, __nat>::value 3760 && _IsNotSame<__swap2, __nat>::value; 3761}; 3762 3763template <class _Tp, class _Up> 3764struct __swappable_with<_Tp, _Up, false> : false_type {}; 3765 3766template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 3767struct __nothrow_swappable_with { 3768 static const bool value = 3769#ifndef _LIBCPP_HAS_NO_NOEXCEPT 3770 noexcept(swap(_VSTD::declval<_Tp>(), _VSTD::declval<_Up>())) 3771 && noexcept(swap(_VSTD::declval<_Up>(), _VSTD::declval<_Tp>())); 3772#else 3773 false; 3774#endif 3775}; 3776 3777template <class _Tp, class _Up> 3778struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 3779 3780} // __detail 3781 3782template <class _Tp> 3783struct __is_swappable 3784 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 3785{ 3786}; 3787 3788template <class _Tp> 3789struct __is_nothrow_swappable 3790 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 3791{ 3792}; 3793 3794#if _LIBCPP_STD_VER > 14 3795 3796template <class _Tp, class _Up> 3797struct _LIBCPP_TEMPLATE_VIS is_swappable_with 3798 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 3799{ 3800}; 3801 3802template <class _Tp> 3803struct _LIBCPP_TEMPLATE_VIS is_swappable 3804 : public conditional< 3805 __is_referenceable<_Tp>::value, 3806 is_swappable_with< 3807 typename add_lvalue_reference<_Tp>::type, 3808 typename add_lvalue_reference<_Tp>::type>, 3809 false_type 3810 >::type 3811{ 3812}; 3813 3814template <class _Tp, class _Up> 3815struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 3816 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 3817{ 3818}; 3819 3820template <class _Tp> 3821struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 3822 : public conditional< 3823 __is_referenceable<_Tp>::value, 3824 is_nothrow_swappable_with< 3825 typename add_lvalue_reference<_Tp>::type, 3826 typename add_lvalue_reference<_Tp>::type>, 3827 false_type 3828 >::type 3829{ 3830}; 3831 3832template <class _Tp, class _Up> 3833_LIBCPP_INLINE_VAR constexpr bool is_swappable_with_v 3834 = is_swappable_with<_Tp, _Up>::value; 3835 3836template <class _Tp> 3837_LIBCPP_INLINE_VAR constexpr bool is_swappable_v 3838 = is_swappable<_Tp>::value; 3839 3840template <class _Tp, class _Up> 3841_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_with_v 3842 = is_nothrow_swappable_with<_Tp, _Up>::value; 3843 3844template <class _Tp> 3845_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_v 3846 = is_nothrow_swappable<_Tp>::value; 3847 3848#endif // _LIBCPP_STD_VER > 14 3849 3850template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 3851 3852template <class _Tp> 3853struct __underlying_type_impl<_Tp, false> {}; 3854 3855template <class _Tp> 3856struct __underlying_type_impl<_Tp, true> 3857{ 3858 typedef __underlying_type(_Tp) type; 3859}; 3860 3861template <class _Tp> 3862struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 3863 3864#if _LIBCPP_STD_VER > 11 3865template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 3866#endif 3867 3868 3869template <class _Tp, bool = is_enum<_Tp>::value> 3870struct __sfinae_underlying_type 3871{ 3872 typedef typename underlying_type<_Tp>::type type; 3873 typedef decltype(((type)1) + 0) __promoted_type; 3874}; 3875 3876template <class _Tp> 3877struct __sfinae_underlying_type<_Tp, false> {}; 3878 3879inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3880int __convert_to_integral(int __val) { return __val; } 3881 3882inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3883unsigned __convert_to_integral(unsigned __val) { return __val; } 3884 3885inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3886long __convert_to_integral(long __val) { return __val; } 3887 3888inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3889unsigned long __convert_to_integral(unsigned long __val) { return __val; } 3890 3891inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3892long long __convert_to_integral(long long __val) { return __val; } 3893 3894inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3895unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 3896 3897template<typename _Fp> 3898inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3899typename enable_if<is_floating_point<_Fp>::value, long long>::type 3900 __convert_to_integral(_Fp __val) { return __val; } 3901 3902#ifndef _LIBCPP_HAS_NO_INT128 3903inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3904__int128_t __convert_to_integral(__int128_t __val) { return __val; } 3905 3906inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3907__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 3908#endif 3909 3910template <class _Tp> 3911inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3912typename __sfinae_underlying_type<_Tp>::__promoted_type 3913__convert_to_integral(_Tp __val) { return __val; } 3914 3915#ifndef _LIBCPP_CXX03_LANG 3916 3917template <class _Tp> 3918struct __has_operator_addressof_member_imp 3919{ 3920 template <class _Up> 3921 static auto __test(int) 3922 -> typename __select_2nd<decltype(_VSTD::declval<_Up>().operator&()), true_type>::type; 3923 template <class> 3924 static auto __test(long) -> false_type; 3925 3926 static const bool value = decltype(__test<_Tp>(0))::value; 3927}; 3928 3929template <class _Tp> 3930struct __has_operator_addressof_free_imp 3931{ 3932 template <class _Up> 3933 static auto __test(int) 3934 -> typename __select_2nd<decltype(operator&(_VSTD::declval<_Up>())), true_type>::type; 3935 template <class> 3936 static auto __test(long) -> false_type; 3937 3938 static const bool value = decltype(__test<_Tp>(0))::value; 3939}; 3940 3941template <class _Tp> 3942struct __has_operator_addressof 3943 : public integral_constant<bool, __has_operator_addressof_member_imp<_Tp>::value 3944 || __has_operator_addressof_free_imp<_Tp>::value> 3945{}; 3946 3947#endif // _LIBCPP_CXX03_LANG 3948 3949#if _LIBCPP_STD_VER > 14 3950 3951template <class...> using void_t = void; 3952 3953template <class... _Args> 3954struct conjunction : _And<_Args...> {}; 3955template<class... _Args> 3956_LIBCPP_INLINE_VAR constexpr bool conjunction_v 3957 = conjunction<_Args...>::value; 3958 3959template <class... _Args> 3960struct disjunction : _Or<_Args...> {}; 3961template<class... _Args> 3962_LIBCPP_INLINE_VAR constexpr bool disjunction_v 3963 = disjunction<_Args...>::value; 3964 3965template <class _Tp> 3966struct negation : _Not<_Tp> {}; 3967template<class _Tp> 3968_LIBCPP_INLINE_VAR constexpr bool negation_v 3969 = negation<_Tp>::value; 3970#endif // _LIBCPP_STD_VER > 14 3971 3972// These traits are used in __tree and __hash_table 3973#ifndef _LIBCPP_CXX03_LANG 3974struct __extract_key_fail_tag {}; 3975struct __extract_key_self_tag {}; 3976struct __extract_key_first_tag {}; 3977 3978template <class _ValTy, class _Key, 3979 class _RawValTy = typename __unconstref<_ValTy>::type> 3980struct __can_extract_key 3981 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 3982 __extract_key_fail_tag>::type {}; 3983 3984template <class _Pair, class _Key, class _First, class _Second> 3985struct __can_extract_key<_Pair, _Key, pair<_First, _Second>> 3986 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 3987 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 3988 3989// __can_extract_map_key uses true_type/false_type instead of the tags. 3990// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 3991// and _ValTy == _Key. 3992template <class _ValTy, class _Key, class _ContainerValueTy, 3993 class _RawValTy = typename __unconstref<_ValTy>::type> 3994struct __can_extract_map_key 3995 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 3996 3997// This specialization returns __extract_key_fail_tag for non-map containers 3998// because _Key == _ContainerValueTy 3999template <class _ValTy, class _Key, class _RawValTy> 4000struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 4001 : false_type {}; 4002 4003#endif 4004 4005#ifndef _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED 4006#if _LIBCPP_STD_VER > 17 4007_LIBCPP_INLINE_VISIBILITY 4008inline constexpr bool is_constant_evaluated() noexcept { 4009 return __builtin_is_constant_evaluated(); 4010} 4011#endif 4012 4013inline _LIBCPP_CONSTEXPR 4014bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 4015#else 4016inline _LIBCPP_CONSTEXPR 4017bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; } 4018#endif 4019 4020template <class _CharT> 4021using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 4022 4023_LIBCPP_END_NAMESPACE_STD 4024 4025#if _LIBCPP_STD_VER > 14 4026// std::byte 4027namespace std // purposefully not versioned 4028{ 4029template <class _Integer> 4030 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type & 4031 operator<<=(byte& __lhs, _Integer __shift) noexcept 4032 { return __lhs = __lhs << __shift; } 4033 4034template <class _Integer> 4035 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type 4036 operator<< (byte __lhs, _Integer __shift) noexcept 4037 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); } 4038 4039template <class _Integer> 4040 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type & 4041 operator>>=(byte& __lhs, _Integer __shift) noexcept 4042 { return __lhs = __lhs >> __shift; } 4043 4044template <class _Integer> 4045 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type 4046 operator>> (byte __lhs, _Integer __shift) noexcept 4047 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); } 4048 4049template <class _Integer> 4050 constexpr typename enable_if<is_integral_v<_Integer>, _Integer>::type 4051 to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); } 4052 4053} 4054#endif 4055 4056#endif // _LIBCPP_TYPE_TRAITS 4057