1// -*- C++ -*- 2//===------------------------ type_traits ---------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TYPE_TRAITS 11#define _LIBCPP_TYPE_TRAITS 12 13/* 14 type_traits synopsis 15 16namespace std 17{ 18 19 // helper class: 20 template <class T, T v> struct integral_constant; 21 typedef integral_constant<bool, true> true_type; // C++11 22 typedef integral_constant<bool, false> false_type; // C++11 23 24 template <bool B> // C++14 25 using bool_constant = integral_constant<bool, B>; // C++14 26 typedef bool_constant<true> true_type; // C++14 27 typedef bool_constant<false> false_type; // C++14 28 29 // helper traits 30 template <bool, class T = void> struct enable_if; 31 template <bool, class T, class F> struct conditional; 32 33 // Primary classification traits: 34 template <class T> struct is_void; 35 template <class T> struct is_null_pointer; // C++14 36 template <class T> struct is_integral; 37 template <class T> struct is_floating_point; 38 template <class T> struct is_array; 39 template <class T> struct is_pointer; 40 template <class T> struct is_lvalue_reference; 41 template <class T> struct is_rvalue_reference; 42 template <class T> struct is_member_object_pointer; 43 template <class T> struct is_member_function_pointer; 44 template <class T> struct is_enum; 45 template <class T> struct is_union; 46 template <class T> struct is_class; 47 template <class T> struct is_function; 48 49 // Secondary classification traits: 50 template <class T> struct is_reference; 51 template <class T> struct is_arithmetic; 52 template <class T> struct is_fundamental; 53 template <class T> struct is_member_pointer; 54 template <class T> struct is_scoped_enum; // C++2b 55 template <class T> struct is_scalar; 56 template <class T> struct is_object; 57 template <class T> struct is_compound; 58 59 // Const-volatile properties and transformations: 60 template <class T> struct is_const; 61 template <class T> struct is_volatile; 62 template <class T> struct remove_const; 63 template <class T> struct remove_volatile; 64 template <class T> struct remove_cv; 65 template <class T> struct add_const; 66 template <class T> struct add_volatile; 67 template <class T> struct add_cv; 68 69 // Reference transformations: 70 template <class T> struct remove_reference; 71 template <class T> struct add_lvalue_reference; 72 template <class T> struct add_rvalue_reference; 73 74 // Pointer transformations: 75 template <class T> struct remove_pointer; 76 template <class T> struct add_pointer; 77 78 template<class T> struct type_identity; // C++20 79 template<class T> 80 using type_identity_t = typename type_identity<T>::type; // C++20 81 82 // Integral properties: 83 template <class T> struct is_signed; 84 template <class T> struct is_unsigned; 85 template <class T> struct make_signed; 86 template <class T> struct make_unsigned; 87 88 // Array properties and transformations: 89 template <class T> struct rank; 90 template <class T, unsigned I = 0> struct extent; 91 template <class T> struct remove_extent; 92 template <class T> struct remove_all_extents; 93 94 template <class T> struct is_bounded_array; // C++20 95 template <class T> struct is_unbounded_array; // C++20 96 97 // Member introspection: 98 template <class T> struct is_pod; 99 template <class T> struct is_trivial; 100 template <class T> struct is_trivially_copyable; 101 template <class T> struct is_standard_layout; 102 template <class T> struct is_literal_type; // Deprecated in C++17; removed in C++20 103 template <class T> struct is_empty; 104 template <class T> struct is_polymorphic; 105 template <class T> struct is_abstract; 106 template <class T> struct is_final; // C++14 107 template <class T> struct is_aggregate; // C++17 108 109 template <class T, class... Args> struct is_constructible; 110 template <class T> struct is_default_constructible; 111 template <class T> struct is_copy_constructible; 112 template <class T> struct is_move_constructible; 113 template <class T, class U> struct is_assignable; 114 template <class T> struct is_copy_assignable; 115 template <class T> struct is_move_assignable; 116 template <class T, class U> struct is_swappable_with; // C++17 117 template <class T> struct is_swappable; // C++17 118 template <class T> struct is_destructible; 119 120 template <class T, class... Args> struct is_trivially_constructible; 121 template <class T> struct is_trivially_default_constructible; 122 template <class T> struct is_trivially_copy_constructible; 123 template <class T> struct is_trivially_move_constructible; 124 template <class T, class U> struct is_trivially_assignable; 125 template <class T> struct is_trivially_copy_assignable; 126 template <class T> struct is_trivially_move_assignable; 127 template <class T> struct is_trivially_destructible; 128 129 template <class T, class... Args> struct is_nothrow_constructible; 130 template <class T> struct is_nothrow_default_constructible; 131 template <class T> struct is_nothrow_copy_constructible; 132 template <class T> struct is_nothrow_move_constructible; 133 template <class T, class U> struct is_nothrow_assignable; 134 template <class T> struct is_nothrow_copy_assignable; 135 template <class T> struct is_nothrow_move_assignable; 136 template <class T, class U> struct is_nothrow_swappable_with; // C++17 137 template <class T> struct is_nothrow_swappable; // C++17 138 template <class T> struct is_nothrow_destructible; 139 140 template <class T> struct has_virtual_destructor; 141 142 template<class T> struct has_unique_object_representations; // C++17 143 144 // Relationships between types: 145 template <class T, class U> struct is_same; 146 template <class Base, class Derived> struct is_base_of; 147 148 template <class From, class To> struct is_convertible; 149 template <typename From, typename To> struct is_nothrow_convertible; // C++20 150 template <typename From, typename To> inline constexpr bool is_nothrow_convertible_v; // C++20 151 152 template <class Fn, class... ArgTypes> struct is_invocable; 153 template <class R, class Fn, class... ArgTypes> struct is_invocable_r; 154 155 template <class Fn, class... ArgTypes> struct is_nothrow_invocable; 156 template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r; 157 158 // Alignment properties and transformations: 159 template <class T> struct alignment_of; 160 template <size_t Len, size_t Align = most_stringent_alignment_requirement> 161 struct aligned_storage; 162 template <size_t Len, class... Types> struct aligned_union; 163 template <class T> struct remove_cvref; // C++20 164 165 template <class T> struct decay; 166 template <class... T> struct common_type; 167 template <class T> struct underlying_type; 168 template <class> class result_of; // undefined; deprecated in C++17; removed in C++20 169 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; // deprecated in C++17; removed in C++20 170 template <class Fn, class... ArgTypes> struct invoke_result; // C++17 171 172 // const-volatile modifications: 173 template <class T> 174 using remove_const_t = typename remove_const<T>::type; // C++14 175 template <class T> 176 using remove_volatile_t = typename remove_volatile<T>::type; // C++14 177 template <class T> 178 using remove_cv_t = typename remove_cv<T>::type; // C++14 179 template <class T> 180 using add_const_t = typename add_const<T>::type; // C++14 181 template <class T> 182 using add_volatile_t = typename add_volatile<T>::type; // C++14 183 template <class T> 184 using add_cv_t = typename add_cv<T>::type; // C++14 185 186 // reference modifications: 187 template <class T> 188 using remove_reference_t = typename remove_reference<T>::type; // C++14 189 template <class T> 190 using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; // C++14 191 template <class T> 192 using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; // C++14 193 194 // sign modifications: 195 template <class T> 196 using make_signed_t = typename make_signed<T>::type; // C++14 197 template <class T> 198 using make_unsigned_t = typename make_unsigned<T>::type; // C++14 199 200 // array modifications: 201 template <class T> 202 using remove_extent_t = typename remove_extent<T>::type; // C++14 203 template <class T> 204 using remove_all_extents_t = typename remove_all_extents<T>::type; // C++14 205 206 template <class T> 207 inline constexpr bool is_bounded_array_v 208 = is_bounded_array<T>::value; // C++20 209 inline constexpr bool is_unbounded_array_v 210 = is_unbounded_array<T>::value; // C++20 211 212 // pointer modifications: 213 template <class T> 214 using remove_pointer_t = typename remove_pointer<T>::type; // C++14 215 template <class T> 216 using add_pointer_t = typename add_pointer<T>::type; // C++14 217 218 // other transformations: 219 template <size_t Len, size_t Align=default-alignment> 220 using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14 221 template <size_t Len, class... Types> 222 using aligned_union_t = typename aligned_union<Len,Types...>::type; // C++14 223 template <class T> 224 using remove_cvref_t = typename remove_cvref<T>::type; // C++20 225 template <class T> 226 using decay_t = typename decay<T>::type; // C++14 227 template <bool b, class T=void> 228 using enable_if_t = typename enable_if<b,T>::type; // C++14 229 template <bool b, class T, class F> 230 using conditional_t = typename conditional<b,T,F>::type; // C++14 231 template <class... T> 232 using common_type_t = typename common_type<T...>::type; // C++14 233 template <class T> 234 using underlying_type_t = typename underlying_type<T>::type; // C++14 235 template <class T> 236 using result_of_t = typename result_of<T>::type; // C++14; deprecated in C++17; removed in C++20 237 template <class Fn, class... ArgTypes> 238 using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; // C++17 239 240 template <class...> 241 using void_t = void; // C++17 242 243 // See C++14 20.10.4.1, primary type categories 244 template <class T> inline constexpr bool is_void_v 245 = is_void<T>::value; // C++17 246 template <class T> inline constexpr bool is_null_pointer_v 247 = is_null_pointer<T>::value; // C++17 248 template <class T> inline constexpr bool is_integral_v 249 = is_integral<T>::value; // C++17 250 template <class T> inline constexpr bool is_floating_point_v 251 = is_floating_point<T>::value; // C++17 252 template <class T> inline constexpr bool is_array_v 253 = is_array<T>::value; // C++17 254 template <class T> inline constexpr bool is_pointer_v 255 = is_pointer<T>::value; // C++17 256 template <class T> inline constexpr bool is_lvalue_reference_v 257 = is_lvalue_reference<T>::value; // C++17 258 template <class T> inline constexpr bool is_rvalue_reference_v 259 = is_rvalue_reference<T>::value; // C++17 260 template <class T> inline constexpr bool is_member_object_pointer_v 261 = is_member_object_pointer<T>::value; // C++17 262 template <class T> inline constexpr bool is_member_function_pointer_v 263 = is_member_function_pointer<T>::value; // C++17 264 template <class T> inline constexpr bool is_enum_v 265 = is_enum<T>::value; // C++17 266 template <class T> inline constexpr bool is_union_v 267 = is_union<T>::value; // C++17 268 template <class T> inline constexpr bool is_class_v 269 = is_class<T>::value; // C++17 270 template <class T> inline constexpr bool is_function_v 271 = is_function<T>::value; // C++17 272 273 // See C++14 20.10.4.2, composite type categories 274 template <class T> inline constexpr bool is_reference_v 275 = is_reference<T>::value; // C++17 276 template <class T> inline constexpr bool is_arithmetic_v 277 = is_arithmetic<T>::value; // C++17 278 template <class T> inline constexpr bool is_fundamental_v 279 = is_fundamental<T>::value; // C++17 280 template <class T> inline constexpr bool is_object_v 281 = is_object<T>::value; // C++17 282 template <class T> inline constexpr bool is_scalar_v 283 = is_scalar<T>::value; // C++17 284 template <class T> inline constexpr bool is_compound_v 285 = is_compound<T>::value; // C++17 286 template <class T> inline constexpr bool is_member_pointer_v 287 = is_member_pointer<T>::value; // C++17 288 template <class T> inline constexpr bool is_scoped_enum_v 289 = is_scoped_enum<T>::value; // C++2b 290 291 // See C++14 20.10.4.3, type properties 292 template <class T> inline constexpr bool is_const_v 293 = is_const<T>::value; // C++17 294 template <class T> inline constexpr bool is_volatile_v 295 = is_volatile<T>::value; // C++17 296 template <class T> inline constexpr bool is_trivial_v 297 = is_trivial<T>::value; // C++17 298 template <class T> inline constexpr bool is_trivially_copyable_v 299 = is_trivially_copyable<T>::value; // C++17 300 template <class T> inline constexpr bool is_standard_layout_v 301 = is_standard_layout<T>::value; // C++17 302 template <class T> inline constexpr bool is_pod_v 303 = is_pod<T>::value; // C++17 304 template <class T> inline constexpr bool is_literal_type_v 305 = is_literal_type<T>::value; // C++17; deprecated in C++17; removed in C++20 306 template <class T> inline constexpr bool is_empty_v 307 = is_empty<T>::value; // C++17 308 template <class T> inline constexpr bool is_polymorphic_v 309 = is_polymorphic<T>::value; // C++17 310 template <class T> inline constexpr bool is_abstract_v 311 = is_abstract<T>::value; // C++17 312 template <class T> inline constexpr bool is_final_v 313 = is_final<T>::value; // C++17 314 template <class T> inline constexpr bool is_aggregate_v 315 = is_aggregate<T>::value; // C++17 316 template <class T> inline constexpr bool is_signed_v 317 = is_signed<T>::value; // C++17 318 template <class T> inline constexpr bool is_unsigned_v 319 = is_unsigned<T>::value; // C++17 320 template <class T, class... Args> inline constexpr bool is_constructible_v 321 = is_constructible<T, Args...>::value; // C++17 322 template <class T> inline constexpr bool is_default_constructible_v 323 = is_default_constructible<T>::value; // C++17 324 template <class T> inline constexpr bool is_copy_constructible_v 325 = is_copy_constructible<T>::value; // C++17 326 template <class T> inline constexpr bool is_move_constructible_v 327 = is_move_constructible<T>::value; // C++17 328 template <class T, class U> inline constexpr bool is_assignable_v 329 = is_assignable<T, U>::value; // C++17 330 template <class T> inline constexpr bool is_copy_assignable_v 331 = is_copy_assignable<T>::value; // C++17 332 template <class T> inline constexpr bool is_move_assignable_v 333 = is_move_assignable<T>::value; // C++17 334 template <class T, class U> inline constexpr bool is_swappable_with_v 335 = is_swappable_with<T, U>::value; // C++17 336 template <class T> inline constexpr bool is_swappable_v 337 = is_swappable<T>::value; // C++17 338 template <class T> inline constexpr bool is_destructible_v 339 = is_destructible<T>::value; // C++17 340 template <class T, class... Args> inline constexpr bool is_trivially_constructible_v 341 = is_trivially_constructible<T, Args...>::value; // C++17 342 template <class T> inline constexpr bool is_trivially_default_constructible_v 343 = is_trivially_default_constructible<T>::value; // C++17 344 template <class T> inline constexpr bool is_trivially_copy_constructible_v 345 = is_trivially_copy_constructible<T>::value; // C++17 346 template <class T> inline constexpr bool is_trivially_move_constructible_v 347 = is_trivially_move_constructible<T>::value; // C++17 348 template <class T, class U> inline constexpr bool is_trivially_assignable_v 349 = is_trivially_assignable<T, U>::value; // C++17 350 template <class T> inline constexpr bool is_trivially_copy_assignable_v 351 = is_trivially_copy_assignable<T>::value; // C++17 352 template <class T> inline constexpr bool is_trivially_move_assignable_v 353 = is_trivially_move_assignable<T>::value; // C++17 354 template <class T> inline constexpr bool is_trivially_destructible_v 355 = is_trivially_destructible<T>::value; // C++17 356 template <class T, class... Args> inline constexpr bool is_nothrow_constructible_v 357 = is_nothrow_constructible<T, Args...>::value; // C++17 358 template <class T> inline constexpr bool is_nothrow_default_constructible_v 359 = is_nothrow_default_constructible<T>::value; // C++17 360 template <class T> inline constexpr bool is_nothrow_copy_constructible_v 361 = is_nothrow_copy_constructible<T>::value; // C++17 362 template <class T> inline constexpr bool is_nothrow_move_constructible_v 363 = is_nothrow_move_constructible<T>::value; // C++17 364 template <class T, class U> inline constexpr bool is_nothrow_assignable_v 365 = is_nothrow_assignable<T, U>::value; // C++17 366 template <class T> inline constexpr bool is_nothrow_copy_assignable_v 367 = is_nothrow_copy_assignable<T>::value; // C++17 368 template <class T> inline constexpr bool is_nothrow_move_assignable_v 369 = is_nothrow_move_assignable<T>::value; // C++17 370 template <class T, class U> inline constexpr bool is_nothrow_swappable_with_v 371 = is_nothrow_swappable_with<T, U>::value; // C++17 372 template <class T> inline constexpr bool is_nothrow_swappable_v 373 = is_nothrow_swappable<T>::value; // C++17 374 template <class T> inline constexpr bool is_nothrow_destructible_v 375 = is_nothrow_destructible<T>::value; // C++17 376 template <class T> inline constexpr bool has_virtual_destructor_v 377 = has_virtual_destructor<T>::value; // C++17 378 template<class T> inline constexpr bool has_unique_object_representations_v // C++17 379 = has_unique_object_representations<T>::value; 380 381 // See C++14 20.10.5, type property queries 382 template <class T> inline constexpr size_t alignment_of_v 383 = alignment_of<T>::value; // C++17 384 template <class T> inline constexpr size_t rank_v 385 = rank<T>::value; // C++17 386 template <class T, unsigned I = 0> inline constexpr size_t extent_v 387 = extent<T, I>::value; // C++17 388 389 // See C++14 20.10.6, type relations 390 template <class T, class U> inline constexpr bool is_same_v 391 = is_same<T, U>::value; // C++17 392 template <class Base, class Derived> inline constexpr bool is_base_of_v 393 = is_base_of<Base, Derived>::value; // C++17 394 template <class From, class To> inline constexpr bool is_convertible_v 395 = is_convertible<From, To>::value; // C++17 396 template <class Fn, class... ArgTypes> inline constexpr bool is_invocable_v 397 = is_invocable<Fn, ArgTypes...>::value; // C++17 398 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_invocable_r_v 399 = is_invocable_r<R, Fn, ArgTypes...>::value; // C++17 400 template <class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_v 401 = is_nothrow_invocable<Fn, ArgTypes...>::value; // C++17 402 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_r_v 403 = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; // C++17 404 405 // [meta.logical], logical operator traits: 406 template<class... B> struct conjunction; // C++17 407 template<class... B> 408 inline constexpr bool conjunction_v = conjunction<B...>::value; // C++17 409 template<class... B> struct disjunction; // C++17 410 template<class... B> 411 inline constexpr bool disjunction_v = disjunction<B...>::value; // C++17 412 template<class B> struct negation; // C++17 413 template<class B> 414 inline constexpr bool negation_v = negation<B>::value; // C++17 415 416} 417 418*/ 419#include <__config> 420#include <cstddef> 421#include <version> 422 423#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 424#pragma GCC system_header 425#endif 426 427_LIBCPP_BEGIN_NAMESPACE_STD 428 429template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 430template <class _Tp> class _LIBCPP_TEMPLATE_VIS reference_wrapper; 431template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 432 433template <class _Tp, _Tp __v> 434struct _LIBCPP_TEMPLATE_VIS integral_constant 435{ 436 static _LIBCPP_CONSTEXPR const _Tp value = __v; 437 typedef _Tp value_type; 438 typedef integral_constant type; 439 _LIBCPP_INLINE_VISIBILITY 440 _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;} 441#if _LIBCPP_STD_VER > 11 442 _LIBCPP_INLINE_VISIBILITY 443 constexpr value_type operator ()() const _NOEXCEPT {return value;} 444#endif 445}; 446 447template <class _Tp, _Tp __v> 448_LIBCPP_CONSTEXPR const _Tp integral_constant<_Tp, __v>::value; 449 450#if _LIBCPP_STD_VER > 14 451template <bool __b> 452using bool_constant = integral_constant<bool, __b>; 453#define _LIBCPP_BOOL_CONSTANT(__b) bool_constant<(__b)> 454#else 455#define _LIBCPP_BOOL_CONSTANT(__b) integral_constant<bool,(__b)> 456#endif 457 458typedef _LIBCPP_BOOL_CONSTANT(true) true_type; 459typedef _LIBCPP_BOOL_CONSTANT(false) false_type; 460 461template <bool _Val> 462using _BoolConstant _LIBCPP_NODEBUG = integral_constant<bool, _Val>; 463 464template <bool> struct _MetaBase; 465template <> 466struct _MetaBase<true> { 467 template <class _Tp, class _Up> 468 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 469 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 470 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 471 template <class _First, class...> 472 using _FirstImpl _LIBCPP_NODEBUG = _First; 473 template <class, class _Second, class...> 474 using _SecondImpl _LIBCPP_NODEBUG = _Second; 475 template <class _Tp = void> 476 using _EnableIfImpl _LIBCPP_NODEBUG = _Tp; 477 template <class _Result, class _First, class ..._Rest> 478 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 479}; 480 481template <> 482struct _MetaBase<false> { 483 template <class _Tp, class _Up> 484 using _SelectImpl _LIBCPP_NODEBUG = _Up; 485 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 486 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 487 template <class _Result, class ...> 488 using _OrImpl _LIBCPP_NODEBUG = _Result; 489}; 490template <bool _Cond, class _Ret = void> 491using _EnableIf _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>; 492template <bool _Cond, class _IfRes, class _ElseRes> 493using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 494template <class ..._Rest> 495using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 496template <class _Pred> 497struct _Not : _BoolConstant<!_Pred::value> {}; 498template <class ..._Args> 499using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 500template <class ..._Args> 501using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 502 503template <class ...> using __expand_to_true = true_type; 504template <class ..._Pred> 505__expand_to_true<_EnableIf<_Pred::value>...> __and_helper(int); 506template <class ...> 507false_type __and_helper(...); 508template <class ..._Pred> 509using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 510 511template <template <class...> class _Func, class ..._Args> 512struct _Lazy : _Func<_Args...> {}; 513 514// Member detector base 515 516template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 517true_type __sfinae_test_impl(int); 518template <template <class...> class, class ...> 519false_type __sfinae_test_impl(...); 520 521template <template <class ...> class _Templ, class ..._Args> 522using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 523 524template <class> 525struct __void_t { typedef void type; }; 526 527template <class _Tp> 528struct __identity { typedef _Tp type; }; 529 530template <class _Tp> 531using __identity_t _LIBCPP_NODEBUG = typename __identity<_Tp>::type; 532 533template <class _Tp, bool> 534struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 535 536 537template <bool _Bp, class _If, class _Then> 538 struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;}; 539template <class _If, class _Then> 540 struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;}; 541 542#if _LIBCPP_STD_VER > 11 543template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type; 544#endif 545 546template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {}; 547template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;}; 548 549#if _LIBCPP_STD_VER > 11 550template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; 551#endif 552 553// is_same 554 555#if __has_keyword(__is_same) 556 557template <class _Tp, class _Up> 558struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { }; 559 560#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 561template <class _Tp, class _Up> 562_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v = __is_same(_Tp, _Up); 563#endif 564 565#else 566 567template <class _Tp, class _Up> struct _LIBCPP_TEMPLATE_VIS is_same : public false_type {}; 568template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {}; 569 570#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 571template <class _Tp, class _Up> 572_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v 573 = is_same<_Tp, _Up>::value; 574#endif 575 576#endif // __is_same 577 578template <class _Tp, class _Up> 579using _IsSame = _BoolConstant< 580#ifdef __clang__ 581 __is_same(_Tp, _Up) 582#else 583 is_same<_Tp, _Up>::value 584#endif 585>; 586 587template <class _Tp, class _Up> 588using _IsNotSame = _BoolConstant< 589#ifdef __clang__ 590 !__is_same(_Tp, _Up) 591#else 592 !is_same<_Tp, _Up>::value 593#endif 594>; 595 596 597template <class _Tp> 598using __test_for_primary_template = _EnableIf< 599 _IsSame<_Tp, typename _Tp::__primary_template>::value 600 >; 601template <class _Tp> 602using __is_primary_template = _IsValidExpansion< 603 __test_for_primary_template, _Tp 604 >; 605 606struct __two {char __lx[2];}; 607 608// helper class: 609 610// is_const 611 612#if __has_keyword(__is_const) 613 614template <class _Tp> 615struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { }; 616 617#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 618template <class _Tp> 619_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v = __is_const(_Tp); 620#endif 621 622#else 623 624template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 625template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 626 627#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 628template <class _Tp> 629_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v 630 = is_const<_Tp>::value; 631#endif 632 633#endif // __has_keyword(__is_const) 634 635// is_volatile 636 637#if __has_keyword(__is_volatile) 638 639template <class _Tp> 640struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { }; 641 642#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 643template <class _Tp> 644_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v = __is_volatile(_Tp); 645#endif 646 647#else 648 649template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {}; 650template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {}; 651 652#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 653template <class _Tp> 654_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v 655 = is_volatile<_Tp>::value; 656#endif 657 658#endif // __has_keyword(__is_volatile) 659 660// remove_const 661 662#if __has_keyword(__remove_const) 663 664template <class _Tp> 665struct _LIBCPP_TEMPLATE_VIS remove_const {typedef __remove_const(_Tp) type;}; 666 667#if _LIBCPP_STD_VER > 11 668template <class _Tp> using remove_const_t = __remove_const(_Tp); 669#endif 670 671#else 672 673template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const {typedef _Tp type;}; 674template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;}; 675#if _LIBCPP_STD_VER > 11 676template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type; 677#endif 678 679#endif // __has_keyword(__remove_const) 680 681// remove_volatile 682 683#if __has_keyword(__remove_volatile) 684 685template <class _Tp> 686struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef __remove_volatile(_Tp) type;}; 687 688#if _LIBCPP_STD_VER > 11 689template <class _Tp> using remove_volatile_t = __remove_volatile(_Tp); 690#endif 691 692#else 693 694template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef _Tp type;}; 695template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;}; 696#if _LIBCPP_STD_VER > 11 697template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type; 698#endif 699 700#endif // __has_keyword(__remove_volatile) 701 702// remove_cv 703 704#if __has_keyword(__remove_cv) 705 706template <class _Tp> 707struct _LIBCPP_TEMPLATE_VIS remove_cv {typedef __remove_cv(_Tp) type;}; 708 709#if _LIBCPP_STD_VER > 11 710template <class _Tp> using remove_cv_t = __remove_cv(_Tp); 711#endif 712 713#else 714 715template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv 716{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 717#if _LIBCPP_STD_VER > 11 718template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type; 719#endif 720 721#endif // __has_keyword(__remove_cv) 722 723// is_void 724 725#if __has_keyword(__is_void) 726 727template <class _Tp> 728struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { }; 729 730#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 731template <class _Tp> 732_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v = __is_void(_Tp); 733#endif 734 735#else 736 737template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void 738 : public is_same<typename remove_cv<_Tp>::type, void> {}; 739 740#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 741template <class _Tp> 742_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v 743 = is_void<_Tp>::value; 744#endif 745 746#endif // __has_keyword(__is_void) 747 748// __is_nullptr_t 749 750template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 751template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 752 753template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 754 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 755 756#if _LIBCPP_STD_VER > 11 757template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 758 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 759 760#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 761template <class _Tp> 762_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_null_pointer_v 763 = is_null_pointer<_Tp>::value; 764#endif 765#endif // _LIBCPP_STD_VER > 11 766 767// is_integral 768 769#if __has_keyword(__is_integral) 770 771template <class _Tp> 772struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { }; 773 774#if _LIBCPP_STD_VER > 14 775template <class _Tp> 776_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v = __is_integral(_Tp); 777#endif 778 779#else 780 781template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral 782 : public _BoolConstant<__libcpp_is_integral<typename remove_cv<_Tp>::type>::value> {}; 783 784#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 785template <class _Tp> 786_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v 787 = is_integral<_Tp>::value; 788#endif 789 790#endif // __has_keyword(__is_integral) 791 792// [basic.fundamental] defines five standard signed integer types; 793// __int128_t is an extended signed integer type. 794// The signed and unsigned integer types, plus bool and the 795// five types with "char" in their name, compose the "integral" types. 796 797template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 798template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 799template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 800template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 801template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 802template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 803#ifndef _LIBCPP_HAS_NO_INT128 804template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 805#endif 806 807template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 808template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 809template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 810template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 811template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 812template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 813#ifndef _LIBCPP_HAS_NO_INT128 814template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 815#endif 816 817// is_floating_point 818// <concepts> implements __libcpp_floating_point 819 820template <class _Tp> struct __libcpp_is_floating_point : public false_type {}; 821template <> struct __libcpp_is_floating_point<float> : public true_type {}; 822template <> struct __libcpp_is_floating_point<double> : public true_type {}; 823template <> struct __libcpp_is_floating_point<long double> : public true_type {}; 824 825template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point 826 : public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {}; 827 828#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 829template <class _Tp> 830_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_floating_point_v 831 = is_floating_point<_Tp>::value; 832#endif 833 834// is_array 835 836#if __has_keyword(__is_array) 837 838template <class _Tp> 839struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { }; 840 841#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 842template <class _Tp> 843_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v = __is_array(_Tp); 844#endif 845 846#else 847 848template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array 849 : public false_type {}; 850template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]> 851 : public true_type {}; 852template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]> 853 : public true_type {}; 854 855#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 856template <class _Tp> 857_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v 858 = is_array<_Tp>::value; 859#endif 860 861#endif // __has_keyword(__is_array) 862 863// is_pointer 864 865// Before Clang 11 / AppleClang 12.0.5, __is_pointer didn't work for Objective-C types. 866#if __has_keyword(__is_pointer) && \ 867 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1100) && \ 868 !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER < 1205) 869 870template<class _Tp> 871struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { }; 872 873#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 874template <class _Tp> 875_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v = __is_pointer(_Tp); 876#endif 877 878#else // __has_keyword(__is_pointer) 879 880template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 881template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 882 883template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 884#if defined(_LIBCPP_HAS_OBJC_ARC) 885template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 886template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 887template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 888template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 889#endif 890 891template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 892 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 893 894#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 895template <class _Tp> 896_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v 897 = is_pointer<_Tp>::value; 898#endif 899 900#endif // __has_keyword(__is_pointer) 901 902// is_reference 903 904#if __has_keyword(__is_lvalue_reference) && \ 905 __has_keyword(__is_rvalue_reference) && \ 906 __has_keyword(__is_reference) 907 908template<class _Tp> 909struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { }; 910 911template<class _Tp> 912struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { }; 913 914template<class _Tp> 915struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { }; 916 917#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 918template <class _Tp> 919_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v = __is_reference(_Tp); 920 921template <class _Tp> 922_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); 923 924template <class _Tp> 925_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v = __is_rvalue_reference(_Tp); 926#endif 927 928#else // __has_keyword(__is_lvalue_reference) && etc... 929 930template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 931template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 932 933template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 934template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 935 936template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 937template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 938template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {}; 939 940#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 941template <class _Tp> 942_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v 943 = is_reference<_Tp>::value; 944 945template <class _Tp> 946_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v 947 = is_lvalue_reference<_Tp>::value; 948 949template <class _Tp> 950_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v 951 = is_rvalue_reference<_Tp>::value; 952#endif 953 954#endif // __has_keyword(__is_lvalue_reference) && etc... 955 956// is_union 957 958#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 959 960template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 961 : public integral_constant<bool, __is_union(_Tp)> {}; 962 963#else 964 965template <class _Tp> struct __libcpp_union : public false_type {}; 966template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 967 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 968 969#endif 970 971#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 972template <class _Tp> 973_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_union_v 974 = is_union<_Tp>::value; 975#endif 976 977// is_class 978 979#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 980 981template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 982 : public integral_constant<bool, __is_class(_Tp)> {}; 983 984#else 985 986namespace __is_class_imp 987{ 988template <class _Tp> char __test(int _Tp::*); 989template <class _Tp> __two __test(...); 990} 991 992template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 993 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 994 995#endif 996 997#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 998template <class _Tp> 999_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_class_v 1000 = is_class<_Tp>::value; 1001#endif 1002 1003// is_function 1004 1005template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 1006 : public _BoolConstant< 1007#ifdef __clang__ 1008 __is_function(_Tp) 1009#else 1010 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 1011#endif 1012 > {}; 1013 1014 1015#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1016template <class _Tp> 1017_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_function_v 1018 = is_function<_Tp>::value; 1019#endif 1020 1021template <class _Tp> struct __libcpp_is_member_pointer { 1022 enum { 1023 __is_member = false, 1024 __is_func = false, 1025 __is_obj = false 1026 }; 1027}; 1028template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 1029 enum { 1030 __is_member = true, 1031 __is_func = is_function<_Tp>::value, 1032 __is_obj = !__is_func, 1033 }; 1034}; 1035 1036#if __has_keyword(__is_member_function_pointer) 1037 1038template<class _Tp> 1039struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 1040 : _BoolConstant<__is_member_function_pointer(_Tp)> { }; 1041 1042#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1043template <class _Tp> 1044_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 1045 = __is_member_function_pointer(_Tp); 1046#endif 1047 1048#else // __has_keyword(__is_member_function_pointer) 1049 1050template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 1051 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 1052 1053#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1054template <class _Tp> 1055_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 1056 = is_member_function_pointer<_Tp>::value; 1057#endif 1058 1059#endif // __has_keyword(__is_member_function_pointer) 1060 1061// is_member_pointer 1062 1063#if __has_keyword(__is_member_pointer) 1064 1065template<class _Tp> 1066struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { }; 1067 1068#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1069template <class _Tp> 1070_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v = __is_member_pointer(_Tp); 1071#endif 1072 1073#else // __has_keyword(__is_member_pointer) 1074 1075template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 1076 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 1077 1078#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1079template <class _Tp> 1080_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v 1081 = is_member_pointer<_Tp>::value; 1082#endif 1083 1084#endif // __has_keyword(__is_member_pointer) 1085 1086// is_member_object_pointer 1087 1088#if __has_keyword(__is_member_object_pointer) 1089 1090template<class _Tp> 1091struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1092 : _BoolConstant<__is_member_object_pointer(_Tp)> { }; 1093 1094#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1095template <class _Tp> 1096_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 1097 = __is_member_object_pointer(_Tp); 1098#endif 1099 1100#else // __has_keyword(__is_member_object_pointer) 1101 1102template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 1103 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 1104 1105#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1106template <class _Tp> 1107_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 1108 = is_member_object_pointer<_Tp>::value; 1109#endif 1110 1111#endif // __has_keyword(__is_member_object_pointer) 1112 1113// is_enum 1114 1115#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1116 1117template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1118 : public integral_constant<bool, __is_enum(_Tp)> {}; 1119 1120#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1121template <class _Tp> 1122_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v = __is_enum(_Tp); 1123#endif 1124 1125#else 1126 1127template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1128 : public integral_constant<bool, !is_void<_Tp>::value && 1129 !is_integral<_Tp>::value && 1130 !is_floating_point<_Tp>::value && 1131 !is_array<_Tp>::value && 1132 !is_pointer<_Tp>::value && 1133 !is_reference<_Tp>::value && 1134 !is_member_pointer<_Tp>::value && 1135 !is_union<_Tp>::value && 1136 !is_class<_Tp>::value && 1137 !is_function<_Tp>::value > {}; 1138 1139#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1140template <class _Tp> 1141_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v 1142 = is_enum<_Tp>::value; 1143#endif 1144 1145#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1146 1147// is_arithmetic 1148 1149 1150template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 1151 : public integral_constant<bool, is_integral<_Tp>::value || 1152 is_floating_point<_Tp>::value> {}; 1153 1154#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1155template <class _Tp> 1156_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v 1157 = is_arithmetic<_Tp>::value; 1158#endif 1159 1160// is_fundamental 1161 1162// Before Clang 10, __is_fundamental didn't work for nullptr_t. 1163// In C++03 nullptr_t is library-provided but must still count as "fundamental." 1164#if __has_keyword(__is_fundamental) && \ 1165 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) && \ 1166 !defined(_LIBCPP_CXX03_LANG) 1167 1168template<class _Tp> 1169struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { }; 1170 1171#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1172template <class _Tp> 1173_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v = __is_fundamental(_Tp); 1174#endif 1175 1176#else // __has_keyword(__is_fundamental) 1177 1178template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 1179 : public integral_constant<bool, is_void<_Tp>::value || 1180 __is_nullptr_t<_Tp>::value || 1181 is_arithmetic<_Tp>::value> {}; 1182 1183#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1184template <class _Tp> 1185_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v 1186 = is_fundamental<_Tp>::value; 1187#endif 1188 1189#endif // __has_keyword(__is_fundamental) 1190 1191// is_scalar 1192 1193// In C++03 nullptr_t is library-provided but must still count as "scalar." 1194#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG) 1195 1196template<class _Tp> 1197struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { }; 1198 1199#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1200template <class _Tp> 1201_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v = __is_scalar(_Tp); 1202#endif 1203 1204#else // __has_keyword(__is_scalar) 1205 1206template <class _Tp> struct __is_block : false_type {}; 1207#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) 1208template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {}; 1209#endif 1210 1211template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1212 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1213 is_member_pointer<_Tp>::value || 1214 is_pointer<_Tp>::value || 1215 __is_nullptr_t<_Tp>::value || 1216 __is_block<_Tp>::value || 1217 is_enum<_Tp>::value > {}; 1218 1219template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1220 1221#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1222template <class _Tp> 1223_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v 1224 = is_scalar<_Tp>::value; 1225#endif 1226 1227#endif // __has_keyword(__is_scalar) 1228 1229// is_object 1230 1231#if __has_keyword(__is_object) 1232 1233template<class _Tp> 1234struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { }; 1235 1236#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1237template <class _Tp> 1238_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v = __is_object(_Tp); 1239#endif 1240 1241#else // __has_keyword(__is_object) 1242 1243template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1244 : public integral_constant<bool, is_scalar<_Tp>::value || 1245 is_array<_Tp>::value || 1246 is_union<_Tp>::value || 1247 is_class<_Tp>::value > {}; 1248 1249#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1250template <class _Tp> 1251_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v 1252 = is_object<_Tp>::value; 1253#endif 1254 1255#endif // __has_keyword(__is_object) 1256 1257// is_compound 1258 1259// >= 11 because in C++03 nullptr isn't actually nullptr 1260#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG) 1261 1262template<class _Tp> 1263struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { }; 1264 1265#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1266template <class _Tp> 1267_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v = __is_compound(_Tp); 1268#endif 1269 1270#else // __has_keyword(__is_compound) 1271 1272template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1273 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1274 1275#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1276template <class _Tp> 1277_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v 1278 = is_compound<_Tp>::value; 1279#endif 1280 1281#endif // __has_keyword(__is_compound) 1282 1283// __is_referenceable [defns.referenceable] 1284 1285struct __is_referenceable_impl { 1286 template <class _Tp> static _Tp& __test(int); 1287 template <class _Tp> static __two __test(...); 1288}; 1289 1290template <class _Tp> 1291struct __is_referenceable : integral_constant<bool, 1292 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1293 1294 1295// add_const 1296 1297template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1298 typedef _LIBCPP_NODEBUG const _Tp type; 1299}; 1300 1301#if _LIBCPP_STD_VER > 11 1302template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1303#endif 1304 1305// add_volatile 1306 1307template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1308 typedef _LIBCPP_NODEBUG volatile _Tp type; 1309}; 1310 1311#if _LIBCPP_STD_VER > 11 1312template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1313#endif 1314 1315// add_cv 1316template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1317 typedef _LIBCPP_NODEBUG const volatile _Tp type; 1318}; 1319 1320#if _LIBCPP_STD_VER > 11 1321template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1322#endif 1323 1324// remove_reference 1325 1326#if __has_keyword(__remove_reference) 1327 1328template<class _Tp> 1329struct _LIBCPP_TEMPLATE_VIS remove_reference { typedef __remove_reference(_Tp) type; }; 1330 1331#else // __has_keyword(__remove_reference) 1332 1333template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG _Tp type;}; 1334template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG _Tp type;}; 1335template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG _Tp type;}; 1336 1337#if _LIBCPP_STD_VER > 11 1338template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1339#endif 1340 1341#endif // __has_keyword(__remove_reference) 1342 1343// add_lvalue_reference 1344 1345template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG _Tp type; }; 1346template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp& type; }; 1347 1348template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1349{typedef _LIBCPP_NODEBUG typename __add_lvalue_reference_impl<_Tp>::type type;}; 1350 1351#if _LIBCPP_STD_VER > 11 1352template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1353#endif 1354 1355template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG _Tp type; }; 1356template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp&& type; }; 1357 1358template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1359{typedef _LIBCPP_NODEBUG typename __add_rvalue_reference_impl<_Tp>::type type;}; 1360 1361#if _LIBCPP_STD_VER > 11 1362template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1363#endif 1364 1365// Suppress deprecation notice for volatile-qualified return type resulting 1366// from volatile-qualified types _Tp. 1367_LIBCPP_SUPPRESS_DEPRECATED_PUSH 1368template <class _Tp> _Tp&& __declval(int); 1369template <class _Tp> _Tp __declval(long); 1370_LIBCPP_SUPPRESS_DEPRECATED_POP 1371 1372template <class _Tp> 1373decltype(__declval<_Tp>(0)) 1374declval() _NOEXCEPT; 1375 1376// __uncvref 1377 1378template <class _Tp> 1379struct __uncvref { 1380 typedef _LIBCPP_NODEBUG typename remove_cv<typename remove_reference<_Tp>::type>::type type; 1381}; 1382 1383template <class _Tp> 1384struct __unconstref { 1385 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 1386}; 1387 1388#ifndef _LIBCPP_CXX03_LANG 1389template <class _Tp> 1390using __uncvref_t _LIBCPP_NODEBUG = typename __uncvref<_Tp>::type; 1391#endif 1392 1393// __is_same_uncvref 1394 1395template <class _Tp, class _Up> 1396struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type, 1397 typename __uncvref<_Up>::type> {}; 1398 1399#if _LIBCPP_STD_VER > 17 1400// remove_cvref - same as __uncvref 1401template <class _Tp> 1402struct remove_cvref : public __uncvref<_Tp> {}; 1403 1404template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1405#endif 1406 1407 1408struct __any 1409{ 1410 __any(...); 1411}; 1412 1413// remove_pointer 1414 1415template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG _Tp type;}; 1416template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG _Tp type;}; 1417template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG _Tp type;}; 1418template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG _Tp type;}; 1419template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG _Tp type;}; 1420 1421#if _LIBCPP_STD_VER > 11 1422template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1423#endif 1424 1425// add_pointer 1426 1427template <class _Tp, 1428 bool = __is_referenceable<_Tp>::value || 1429 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1430struct __add_pointer_impl 1431 {typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;}; 1432template <class _Tp> struct __add_pointer_impl<_Tp, false> 1433 {typedef _LIBCPP_NODEBUG _Tp type;}; 1434 1435template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1436 {typedef _LIBCPP_NODEBUG typename __add_pointer_impl<_Tp>::type type;}; 1437 1438#if _LIBCPP_STD_VER > 11 1439template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1440#endif 1441 1442// type_identity 1443#if _LIBCPP_STD_VER > 17 1444template<class _Tp> struct type_identity { typedef _Tp type; }; 1445template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1446#endif 1447 1448// is_signed 1449 1450// Before Clang 10, __is_signed didn't work for floating-point types or enums. 1451#if __has_keyword(__is_signed) && \ 1452 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) 1453 1454template<class _Tp> 1455struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { }; 1456 1457#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1458template <class _Tp> 1459_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v = __is_signed(_Tp); 1460#endif 1461 1462#else // __has_keyword(__is_signed) 1463 1464template <class _Tp, bool = is_integral<_Tp>::value> 1465struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {}; 1466 1467template <class _Tp> 1468struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1469 1470template <class _Tp, bool = is_arithmetic<_Tp>::value> 1471struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1472 1473template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1474 1475template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1476 1477#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1478template <class _Tp> 1479_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v 1480 = is_signed<_Tp>::value; 1481#endif 1482 1483#endif // __has_keyword(__is_signed) 1484 1485// is_unsigned 1486 1487// Before Clang 13, __is_unsigned returned true for enums with signed underlying type. 1488// No currently-released version of AppleClang contains the fixed intrinsic. 1489#if __has_keyword(__is_unsigned) && \ 1490 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1300) && \ 1491 !defined(_LIBCPP_APPLE_CLANG_VER) 1492 1493template<class _Tp> 1494struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { }; 1495 1496#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1497template <class _Tp> 1498_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v = __is_unsigned(_Tp); 1499#endif 1500 1501#else // __has_keyword(__is_unsigned) 1502 1503template <class _Tp, bool = is_integral<_Tp>::value> 1504struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {}; 1505 1506template <class _Tp> 1507struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1508 1509template <class _Tp, bool = is_arithmetic<_Tp>::value> 1510struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1511 1512template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1513 1514template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {}; 1515 1516#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1517template <class _Tp> 1518_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v 1519 = is_unsigned<_Tp>::value; 1520#endif 1521 1522#endif // __has_keyword(__is_unsigned) 1523 1524// rank 1525 1526template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1527 : public integral_constant<size_t, 0> {}; 1528template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1529 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1530template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1531 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1532 1533#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1534template <class _Tp> 1535_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t rank_v 1536 = rank<_Tp>::value; 1537#endif 1538 1539// extent 1540 1541#if __has_keyword(__array_extent) 1542 1543template<class _Tp, size_t _Dim = 0> 1544struct _LIBCPP_TEMPLATE_VIS extent 1545 : integral_constant<size_t, __array_extent(_Tp, _Dim)> { }; 1546 1547#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1548template <class _Tp, unsigned _Ip = 0> 1549_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v = __array_extent(_Tp, _Ip); 1550#endif 1551 1552#else // __has_keyword(__array_extent) 1553 1554template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1555 : public integral_constant<size_t, 0> {}; 1556template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1557 : public integral_constant<size_t, 0> {}; 1558template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1559 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1560template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1561 : public integral_constant<size_t, _Np> {}; 1562template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1563 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1564 1565#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1566template <class _Tp, unsigned _Ip = 0> 1567_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v 1568 = extent<_Tp, _Ip>::value; 1569#endif 1570 1571#endif // __has_keyword(__array_extent) 1572 1573// remove_extent 1574 1575template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1576 {typedef _Tp type;}; 1577template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1578 {typedef _Tp type;}; 1579template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1580 {typedef _Tp type;}; 1581 1582#if _LIBCPP_STD_VER > 11 1583template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1584#endif 1585 1586// remove_all_extents 1587 1588template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1589 {typedef _Tp type;}; 1590template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1591 {typedef typename remove_all_extents<_Tp>::type type;}; 1592template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1593 {typedef typename remove_all_extents<_Tp>::type type;}; 1594 1595#if _LIBCPP_STD_VER > 11 1596template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1597#endif 1598 1599#if _LIBCPP_STD_VER > 17 1600// is_bounded_array 1601 1602template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1603template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1604 1605template <class _Tp> 1606_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1607bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1608 1609// is_unbounded_array 1610 1611template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1612template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1613 1614template <class _Tp> 1615_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1616bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1617#endif 1618 1619// decay 1620 1621template <class _Up, bool> 1622struct __decay { 1623 typedef _LIBCPP_NODEBUG typename remove_cv<_Up>::type type; 1624}; 1625 1626template <class _Up> 1627struct __decay<_Up, true> { 1628public: 1629 typedef _LIBCPP_NODEBUG typename conditional 1630 < 1631 is_array<_Up>::value, 1632 typename remove_extent<_Up>::type*, 1633 typename conditional 1634 < 1635 is_function<_Up>::value, 1636 typename add_pointer<_Up>::type, 1637 typename remove_cv<_Up>::type 1638 >::type 1639 >::type type; 1640}; 1641 1642template <class _Tp> 1643struct _LIBCPP_TEMPLATE_VIS decay 1644{ 1645private: 1646 typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up; 1647public: 1648 typedef _LIBCPP_NODEBUG typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1649}; 1650 1651#if _LIBCPP_STD_VER > 11 1652template <class _Tp> using decay_t = typename decay<_Tp>::type; 1653#endif 1654 1655// is_abstract 1656 1657template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1658 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1659 1660#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1661template <class _Tp> 1662_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_abstract_v 1663 = is_abstract<_Tp>::value; 1664#endif 1665 1666// is_final 1667 1668template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1669__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1670 1671#if _LIBCPP_STD_VER > 11 1672template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1673is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1674#endif 1675 1676#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1677template <class _Tp> 1678_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_final_v 1679 = is_final<_Tp>::value; 1680#endif 1681 1682// is_aggregate 1683#if _LIBCPP_STD_VER > 14 1684 1685template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1686is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1687 1688#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1689template <class _Tp> 1690_LIBCPP_INLINE_VAR constexpr bool is_aggregate_v 1691 = is_aggregate<_Tp>::value; 1692#endif 1693 1694#endif // _LIBCPP_STD_VER > 14 1695 1696// is_base_of 1697 1698template <class _Bp, class _Dp> 1699struct _LIBCPP_TEMPLATE_VIS is_base_of 1700 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1701 1702#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1703template <class _Bp, class _Dp> 1704_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_base_of_v 1705 = is_base_of<_Bp, _Dp>::value; 1706#endif 1707 1708// __is_core_convertible 1709 1710// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed. 1711// We can't test for that, but we can test implicit convertibility by passing it 1712// to a function. Notice that __is_core_convertible<void,void> is false, 1713// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later. 1714 1715template <class _Tp, class _Up, class = void> 1716struct __is_core_convertible : public false_type {}; 1717 1718template <class _Tp, class _Up> 1719struct __is_core_convertible<_Tp, _Up, decltype( 1720 static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() ) 1721)> : public true_type {}; 1722 1723// is_convertible 1724 1725#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1726 1727template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1728 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 1729 1730#else // __has_feature(is_convertible_to) 1731 1732namespace __is_convertible_imp 1733{ 1734template <class _Tp> void __test_convert(_Tp); 1735 1736template <class _From, class _To, class = void> 1737struct __is_convertible_test : public false_type {}; 1738 1739template <class _From, class _To> 1740struct __is_convertible_test<_From, _To, 1741 decltype(__is_convertible_imp::__test_convert<_To>(declval<_From>()))> : public true_type 1742{}; 1743 1744template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1745 bool _IsFunction = is_function<_Tp>::value, 1746 bool _IsVoid = is_void<_Tp>::value> 1747 struct __is_array_function_or_void {enum {value = 0};}; 1748template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1749template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1750template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1751} 1752 1753template <class _Tp, 1754 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1755struct __is_convertible_check 1756{ 1757 static const size_t __v = 0; 1758}; 1759 1760template <class _Tp> 1761struct __is_convertible_check<_Tp, 0> 1762{ 1763 static const size_t __v = sizeof(_Tp); 1764}; 1765 1766template <class _T1, class _T2, 1767 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1768 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1769struct __is_convertible 1770 : public integral_constant<bool, 1771 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1772 > 1773{}; 1774 1775template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1776template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1777template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1778template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1779 1780template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1781template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1782template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1783template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1784 1785template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1786template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1787template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1788template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1789 1790template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1791 : public __is_convertible<_T1, _T2> 1792{ 1793 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1794 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1795}; 1796 1797#endif // __has_feature(is_convertible_to) 1798 1799#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1800template <class _From, class _To> 1801_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_convertible_v 1802 = is_convertible<_From, _To>::value; 1803#endif 1804 1805// is_nothrow_convertible 1806 1807#if _LIBCPP_STD_VER > 17 1808 1809template <typename _Tp> 1810static void __test_noexcept(_Tp) noexcept; 1811 1812template<typename _Fm, typename _To> 1813static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 1814__is_nothrow_convertible_test(); 1815 1816template <typename _Fm, typename _To> 1817struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1818{ }; 1819 1820template <typename _Fm, typename _To> 1821struct is_nothrow_convertible : _Or< 1822 _And<is_void<_To>, is_void<_Fm>>, 1823 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1824>::type { }; 1825 1826template <typename _Fm, typename _To> 1827inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1828 1829#endif // _LIBCPP_STD_VER > 17 1830 1831// is_empty 1832 1833#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1834 1835template <class _Tp> 1836struct _LIBCPP_TEMPLATE_VIS is_empty 1837 : public integral_constant<bool, __is_empty(_Tp)> {}; 1838 1839#else // __has_feature(is_empty) 1840 1841template <class _Tp> 1842struct __is_empty1 1843 : public _Tp 1844{ 1845 double __lx; 1846}; 1847 1848struct __is_empty2 1849{ 1850 double __lx; 1851}; 1852 1853template <class _Tp, bool = is_class<_Tp>::value> 1854struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1855 1856template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1857 1858template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1859 1860#endif // __has_feature(is_empty) 1861 1862#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1863template <class _Tp> 1864_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_empty_v 1865 = is_empty<_Tp>::value; 1866#endif 1867 1868// is_polymorphic 1869 1870#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1871 1872template <class _Tp> 1873struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1874 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1875 1876#else 1877 1878template<typename _Tp> char &__is_polymorphic_impl( 1879 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1880 int>::type); 1881template<typename _Tp> __two &__is_polymorphic_impl(...); 1882 1883template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1884 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1885 1886#endif // __has_feature(is_polymorphic) 1887 1888#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1889template <class _Tp> 1890_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_polymorphic_v 1891 = is_polymorphic<_Tp>::value; 1892#endif 1893 1894// has_virtual_destructor 1895 1896#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1897 1898template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1899 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1900 1901#else 1902 1903template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1904 : public false_type {}; 1905 1906#endif 1907 1908#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1909template <class _Tp> 1910_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_virtual_destructor_v 1911 = has_virtual_destructor<_Tp>::value; 1912#endif 1913 1914// has_unique_object_representations 1915 1916#if _LIBCPP_STD_VER > 14 1917 1918template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1919 : public integral_constant<bool, 1920 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1921 1922#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1923template <class _Tp> 1924_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_unique_object_representations_v 1925 = has_unique_object_representations<_Tp>::value; 1926#endif 1927 1928#endif 1929 1930// alignment_of 1931 1932template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1933 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1934 1935#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1936template <class _Tp> 1937_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t alignment_of_v 1938 = alignment_of<_Tp>::value; 1939#endif 1940 1941// aligned_storage 1942 1943template <class _Hp, class _Tp> 1944struct __type_list 1945{ 1946 typedef _Hp _Head; 1947 typedef _Tp _Tail; 1948}; 1949 1950struct __nat 1951{ 1952#ifndef _LIBCPP_CXX03_LANG 1953 __nat() = delete; 1954 __nat(const __nat&) = delete; 1955 __nat& operator=(const __nat&) = delete; 1956 ~__nat() = delete; 1957#endif 1958}; 1959 1960template <class _Tp> 1961struct __align_type 1962{ 1963 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1964 typedef _Tp type; 1965}; 1966 1967struct __struct_double {long double __lx;}; 1968struct __struct_double4 {double __lx[4];}; 1969 1970typedef 1971 __type_list<__align_type<unsigned char>, 1972 __type_list<__align_type<unsigned short>, 1973 __type_list<__align_type<unsigned int>, 1974 __type_list<__align_type<unsigned long>, 1975 __type_list<__align_type<unsigned long long>, 1976 __type_list<__align_type<double>, 1977 __type_list<__align_type<long double>, 1978 __type_list<__align_type<__struct_double>, 1979 __type_list<__align_type<__struct_double4>, 1980 __type_list<__align_type<int*>, 1981 __nat 1982 > > > > > > > > > > __all_types; 1983 1984template <size_t _Align> 1985struct _ALIGNAS(_Align) __fallback_overaligned {}; 1986 1987template <class _TL, size_t _Align> struct __find_pod; 1988 1989template <class _Hp, size_t _Align> 1990struct __find_pod<__type_list<_Hp, __nat>, _Align> 1991{ 1992 typedef typename conditional< 1993 _Align == _Hp::value, 1994 typename _Hp::type, 1995 __fallback_overaligned<_Align> 1996 >::type type; 1997}; 1998 1999template <class _Hp, class _Tp, size_t _Align> 2000struct __find_pod<__type_list<_Hp, _Tp>, _Align> 2001{ 2002 typedef typename conditional< 2003 _Align == _Hp::value, 2004 typename _Hp::type, 2005 typename __find_pod<_Tp, _Align>::type 2006 >::type type; 2007}; 2008 2009template <class _TL, size_t _Len> struct __find_max_align; 2010 2011template <class _Hp, size_t _Len> 2012struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 2013 2014template <size_t _Len, size_t _A1, size_t _A2> 2015struct __select_align 2016{ 2017private: 2018 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 2019 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 2020public: 2021 static const size_t value = _Len < __max ? __min : __max; 2022}; 2023 2024template <class _Hp, class _Tp, size_t _Len> 2025struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 2026 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 2027 2028template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 2029struct _LIBCPP_TEMPLATE_VIS aligned_storage 2030{ 2031 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 2032 union type 2033 { 2034 _Aligner __align; 2035 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 2036 }; 2037}; 2038 2039#if _LIBCPP_STD_VER > 11 2040template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 2041 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 2042#endif 2043 2044#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 2045template <size_t _Len>\ 2046struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 2047{\ 2048 struct _ALIGNAS(n) type\ 2049 {\ 2050 unsigned char __lx[(_Len + n - 1)/n * n];\ 2051 };\ 2052} 2053 2054_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 2055_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 2056_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 2057_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 2058_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 2059_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 2060_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 2061_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 2062_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 2063_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 2064_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 2065_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 2066_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 2067_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 2068// PE/COFF does not support alignment beyond 8192 (=0x2000) 2069#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 2070_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 2071#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 2072 2073#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 2074 2075 2076// aligned_union 2077 2078template <size_t _I0, size_t ..._In> 2079struct __static_max; 2080 2081template <size_t _I0> 2082struct __static_max<_I0> 2083{ 2084 static const size_t value = _I0; 2085}; 2086 2087template <size_t _I0, size_t _I1, size_t ..._In> 2088struct __static_max<_I0, _I1, _In...> 2089{ 2090 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 2091 __static_max<_I1, _In...>::value; 2092}; 2093 2094template <size_t _Len, class _Type0, class ..._Types> 2095struct aligned_union 2096{ 2097 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 2098 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 2099 static const size_t __len = __static_max<_Len, sizeof(_Type0), 2100 sizeof(_Types)...>::value; 2101 typedef typename aligned_storage<__len, alignment_value>::type type; 2102}; 2103 2104#if _LIBCPP_STD_VER > 11 2105template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 2106#endif 2107 2108template <class _Tp> 2109struct __numeric_type 2110{ 2111 static void __test(...); 2112 static float __test(float); 2113 static double __test(char); 2114 static double __test(int); 2115 static double __test(unsigned); 2116 static double __test(long); 2117 static double __test(unsigned long); 2118 static double __test(long long); 2119 static double __test(unsigned long long); 2120 static double __test(double); 2121 static long double __test(long double); 2122 2123 typedef decltype(__test(declval<_Tp>())) type; 2124 static const bool value = _IsNotSame<type, void>::value; 2125}; 2126 2127template <> 2128struct __numeric_type<void> 2129{ 2130 static const bool value = true; 2131}; 2132 2133// __promote 2134 2135template <class _A1, class _A2 = void, class _A3 = void, 2136 bool = __numeric_type<_A1>::value && 2137 __numeric_type<_A2>::value && 2138 __numeric_type<_A3>::value> 2139class __promote_imp 2140{ 2141public: 2142 static const bool value = false; 2143}; 2144 2145template <class _A1, class _A2, class _A3> 2146class __promote_imp<_A1, _A2, _A3, true> 2147{ 2148private: 2149 typedef typename __promote_imp<_A1>::type __type1; 2150 typedef typename __promote_imp<_A2>::type __type2; 2151 typedef typename __promote_imp<_A3>::type __type3; 2152public: 2153 typedef decltype(__type1() + __type2() + __type3()) type; 2154 static const bool value = true; 2155}; 2156 2157template <class _A1, class _A2> 2158class __promote_imp<_A1, _A2, void, true> 2159{ 2160private: 2161 typedef typename __promote_imp<_A1>::type __type1; 2162 typedef typename __promote_imp<_A2>::type __type2; 2163public: 2164 typedef decltype(__type1() + __type2()) type; 2165 static const bool value = true; 2166}; 2167 2168template <class _A1> 2169class __promote_imp<_A1, void, void, true> 2170{ 2171public: 2172 typedef typename __numeric_type<_A1>::type type; 2173 static const bool value = true; 2174}; 2175 2176template <class _A1, class _A2 = void, class _A3 = void> 2177class __promote : public __promote_imp<_A1, _A2, _A3> {}; 2178 2179// make_signed / make_unsigned 2180 2181typedef 2182 __type_list<signed char, 2183 __type_list<signed short, 2184 __type_list<signed int, 2185 __type_list<signed long, 2186 __type_list<signed long long, 2187#ifndef _LIBCPP_HAS_NO_INT128 2188 __type_list<__int128_t, 2189#endif 2190 __nat 2191#ifndef _LIBCPP_HAS_NO_INT128 2192 > 2193#endif 2194 > > > > > __signed_types; 2195 2196typedef 2197 __type_list<unsigned char, 2198 __type_list<unsigned short, 2199 __type_list<unsigned int, 2200 __type_list<unsigned long, 2201 __type_list<unsigned long long, 2202#ifndef _LIBCPP_HAS_NO_INT128 2203 __type_list<__uint128_t, 2204#endif 2205 __nat 2206#ifndef _LIBCPP_HAS_NO_INT128 2207 > 2208#endif 2209 > > > > > __unsigned_types; 2210 2211template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 2212 2213template <class _Hp, class _Tp, size_t _Size> 2214struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 2215{ 2216 typedef _LIBCPP_NODEBUG _Hp type; 2217}; 2218 2219template <class _Hp, class _Tp, size_t _Size> 2220struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 2221{ 2222 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 2223}; 2224 2225template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 2226 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 2227struct __apply_cv 2228{ 2229 typedef _LIBCPP_NODEBUG _Up type; 2230}; 2231 2232template <class _Tp, class _Up> 2233struct __apply_cv<_Tp, _Up, true, false> 2234{ 2235 typedef _LIBCPP_NODEBUG const _Up type; 2236}; 2237 2238template <class _Tp, class _Up> 2239struct __apply_cv<_Tp, _Up, false, true> 2240{ 2241 typedef volatile _Up type; 2242}; 2243 2244template <class _Tp, class _Up> 2245struct __apply_cv<_Tp, _Up, true, true> 2246{ 2247 typedef const volatile _Up type; 2248}; 2249 2250template <class _Tp, class _Up> 2251struct __apply_cv<_Tp&, _Up, false, false> 2252{ 2253 typedef _Up& type; 2254}; 2255 2256template <class _Tp, class _Up> 2257struct __apply_cv<_Tp&, _Up, true, false> 2258{ 2259 typedef const _Up& type; 2260}; 2261 2262template <class _Tp, class _Up> 2263struct __apply_cv<_Tp&, _Up, false, true> 2264{ 2265 typedef volatile _Up& type; 2266}; 2267 2268template <class _Tp, class _Up> 2269struct __apply_cv<_Tp&, _Up, true, true> 2270{ 2271 typedef const volatile _Up& type; 2272}; 2273 2274template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2275struct __make_signed {}; 2276 2277template <class _Tp> 2278struct __make_signed<_Tp, true> 2279{ 2280 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 2281}; 2282 2283template <> struct __make_signed<bool, true> {}; 2284template <> struct __make_signed< signed short, true> {typedef short type;}; 2285template <> struct __make_signed<unsigned short, true> {typedef short type;}; 2286template <> struct __make_signed< signed int, true> {typedef int type;}; 2287template <> struct __make_signed<unsigned int, true> {typedef int type;}; 2288template <> struct __make_signed< signed long, true> {typedef long type;}; 2289template <> struct __make_signed<unsigned long, true> {typedef long type;}; 2290template <> struct __make_signed< signed long long, true> {typedef long long type;}; 2291template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 2292#ifndef _LIBCPP_HAS_NO_INT128 2293template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 2294template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 2295#endif 2296 2297template <class _Tp> 2298struct _LIBCPP_TEMPLATE_VIS make_signed 2299{ 2300 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 2301}; 2302 2303#if _LIBCPP_STD_VER > 11 2304template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 2305#endif 2306 2307template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2308struct __make_unsigned {}; 2309 2310template <class _Tp> 2311struct __make_unsigned<_Tp, true> 2312{ 2313 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2314}; 2315 2316template <> struct __make_unsigned<bool, true> {}; 2317template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2318template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2319template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2320template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2321template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2322template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2323template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2324template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2325#ifndef _LIBCPP_HAS_NO_INT128 2326template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2327template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2328#endif 2329 2330template <class _Tp> 2331struct _LIBCPP_TEMPLATE_VIS make_unsigned 2332{ 2333 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2334}; 2335 2336#if _LIBCPP_STD_VER > 11 2337template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2338#endif 2339 2340#ifndef _LIBCPP_CXX03_LANG 2341template <class _Tp> 2342_LIBCPP_HIDE_FROM_ABI constexpr 2343typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 2344 return static_cast<typename make_unsigned<_Tp>::type>(__x); 2345} 2346#endif 2347 2348#if _LIBCPP_STD_VER > 14 2349template <class...> using void_t = void; 2350#endif 2351 2352#if _LIBCPP_STD_VER > 17 2353// Let COND_RES(X, Y) be: 2354template <class _Tp, class _Up> 2355using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 2356 2357template <class _Tp, class _Up, class = void> 2358struct __common_type3 {}; 2359 2360// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 2361template <class _Tp, class _Up> 2362struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 2363{ 2364 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 2365}; 2366 2367template <class _Tp, class _Up, class = void> 2368struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 2369#else 2370template <class _Tp, class _Up, class = void> 2371struct __common_type2_imp {}; 2372#endif 2373 2374// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 2375template <class _Tp, class _Up> 2376struct __common_type2_imp<_Tp, _Up, 2377 typename __void_t<decltype( 2378 true ? declval<_Tp>() : declval<_Up>() 2379 )>::type> 2380{ 2381 typedef _LIBCPP_NODEBUG typename decay<decltype( 2382 true ? declval<_Tp>() : declval<_Up>() 2383 )>::type type; 2384}; 2385 2386template <class, class = void> 2387struct __common_type_impl {}; 2388 2389// Clang provides variadic templates in C++03 as an extension. 2390#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2391# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2392template <class... Tp> 2393struct __common_types; 2394template <class... _Tp> 2395struct _LIBCPP_TEMPLATE_VIS common_type; 2396#else 2397# define _LIBCPP_OPTIONAL_PACK(...) 2398struct __no_arg; 2399template <class _Tp, class _Up, class = __no_arg> 2400struct __common_types; 2401template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2402 class _Unused = __no_arg> 2403struct common_type { 2404 static_assert(sizeof(_Unused) == 0, 2405 "common_type accepts at most 3 arguments in C++03"); 2406}; 2407#endif // _LIBCPP_CXX03_LANG 2408 2409template <class _Tp, class _Up> 2410struct __common_type_impl< 2411 __common_types<_Tp, _Up>, 2412 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2413{ 2414 typedef typename common_type<_Tp, _Up>::type type; 2415}; 2416 2417template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2418struct __common_type_impl< 2419 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2420 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2421 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2422 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2423}; 2424 2425// bullet 1 - sizeof...(Tp) == 0 2426 2427template <> 2428struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2429 2430// bullet 2 - sizeof...(Tp) == 1 2431 2432template <class _Tp> 2433struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2434 : public common_type<_Tp, _Tp> {}; 2435 2436// bullet 3 - sizeof...(Tp) == 2 2437 2438// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 2439template <class _Tp, class _Up> 2440struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2441 : conditional< 2442 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2443 __common_type2_imp<_Tp, _Up>, 2444 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2445 >::type 2446{}; 2447 2448// bullet 4 - sizeof...(Tp) > 2 2449 2450template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2451struct _LIBCPP_TEMPLATE_VIS 2452 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2453 : __common_type_impl< 2454 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2455 2456#undef _LIBCPP_OPTIONAL_PACK 2457 2458#if _LIBCPP_STD_VER > 11 2459template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2460#endif 2461 2462#if _LIBCPP_STD_VER > 11 2463// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 2464// top-level cv-qualifiers. 2465template <class _From, class _To> 2466struct __copy_cv 2467{ 2468 using type = _To; 2469}; 2470 2471template <class _From, class _To> 2472struct __copy_cv<const _From, _To> 2473{ 2474 using type = add_const_t<_To>; 2475}; 2476 2477template <class _From, class _To> 2478struct __copy_cv<volatile _From, _To> 2479{ 2480 using type = add_volatile_t<_To>; 2481}; 2482 2483template <class _From, class _To> 2484struct __copy_cv<const volatile _From, _To> 2485{ 2486 using type = add_cv_t<_To>; 2487}; 2488 2489template <class _From, class _To> 2490using __copy_cv_t = typename __copy_cv<_From, _To>::type; 2491 2492template <class _From, class _To> 2493struct __copy_cvref 2494{ 2495 using type = __copy_cv_t<_From, _To>; 2496}; 2497 2498template <class _From, class _To> 2499struct __copy_cvref<_From&, _To> 2500{ 2501 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 2502}; 2503 2504template <class _From, class _To> 2505struct __copy_cvref<_From&&, _To> 2506{ 2507 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 2508}; 2509 2510template <class _From, class _To> 2511using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 2512 2513#endif // _LIBCPP_STD_VER > 11 2514 2515// common_reference 2516#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 2517// Let COND_RES(X, Y) be: 2518template <class _Xp, class _Yp> 2519using __cond_res = 2520 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 2521 2522// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 2523// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 2524// `U`. 2525// [Note: `XREF(A)` is `__xref<A>::template __apply`] 2526template <class _Tp> 2527struct __xref { 2528 template<class _Up> 2529 using __apply = __copy_cvref_t<_Tp, _Up>; 2530}; 2531 2532// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 2533// and let COMMON-REF(A, B) be: 2534template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 2535struct __common_ref; 2536 2537template<class _Xp, class _Yp> 2538using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 2539 2540template<class _Xp, class _Yp> 2541using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 2542 2543 2544// If A and B are both lvalue reference types, COMMON-REF(A, B) is 2545// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 2546template<class _Ap, class _Bp, class _Xp, class _Yp> 2547requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 2548struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 2549{ 2550 using __type = __cv_cond_res<_Xp, _Yp>; 2551}; 2552 2553// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 2554template <class _Xp, class _Yp> 2555using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 2556 2557 2558// .... If A and B are both rvalue reference types, C is well-formed, and 2559// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 2560template<class _Ap, class _Bp, class _Xp, class _Yp> 2561requires 2562 requires { typename __common_ref_C<_Xp, _Yp>; } && 2563 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 2564 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 2565struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 2566{ 2567 using __type = __common_ref_C<_Xp, _Yp>; 2568}; 2569 2570// Otherwise, let D be COMMON-REF(const X&, Y&). ... 2571template <class _Tp, class _Up> 2572using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 2573 2574// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 2575// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 2576template<class _Ap, class _Bp, class _Xp, class _Yp> 2577requires requires { typename __common_ref_D<_Xp, _Yp>; } && 2578 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 2579struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 2580{ 2581 using __type = __common_ref_D<_Xp, _Yp>; 2582}; 2583 2584// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 2585// COMMON-REF(A, B) is COMMON-REF(B, A). 2586template<class _Ap, class _Bp, class _Xp, class _Yp> 2587struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 2588 2589// Otherwise, COMMON-REF(A, B) is ill-formed. 2590template<class _Ap, class _Bp, class _Xp, class _Yp> 2591struct __common_ref {}; 2592 2593// Note C: For the common_reference trait applied to a parameter pack [...] 2594 2595template <class...> 2596struct common_reference; 2597 2598template <class... _Types> 2599using common_reference_t = typename common_reference<_Types...>::type; 2600 2601// bullet 1 - sizeof...(T) == 0 2602template<> 2603struct common_reference<> {}; 2604 2605// bullet 2 - sizeof...(T) == 1 2606template <class _Tp> 2607struct common_reference<_Tp> 2608{ 2609 using type = _Tp; 2610}; 2611 2612// bullet 3 - sizeof...(T) == 2 2613template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 2614template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 2615template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 2616 2617// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 2618// the member typedef `type` denotes that type. 2619template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 2620 2621template <class _Tp, class _Up> 2622requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 2623struct __common_reference_sub_bullet1<_Tp, _Up> 2624{ 2625 using type = __common_ref_t<_Tp, _Up>; 2626}; 2627 2628// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 2629// is well-formed, then the member typedef `type` denotes that type. 2630template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 2631 2632template <class _Tp, class _Up> 2633using __basic_common_reference_t = typename basic_common_reference< 2634 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 2635 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 2636 2637template <class _Tp, class _Up> 2638requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 2639struct __common_reference_sub_bullet2<_Tp, _Up> 2640{ 2641 using type = __basic_common_reference_t<_Tp, _Up>; 2642}; 2643 2644// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 2645// then the member typedef `type` denotes that type. 2646template <class _Tp, class _Up> 2647requires requires { typename __cond_res<_Tp, _Up>; } 2648struct __common_reference_sub_bullet3<_Tp, _Up> 2649{ 2650 using type = __cond_res<_Tp, _Up>; 2651}; 2652 2653 2654// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 2655// then the member typedef `type` denotes that type. 2656// - Otherwise, there shall be no member `type`. 2657template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 2658 2659// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 2660// any, as `common_reference_t<C, Rest...>`. 2661template <class _Tp, class _Up, class _Vp, class... _Rest> 2662requires requires { typename common_reference_t<_Tp, _Up>; } 2663struct common_reference<_Tp, _Up, _Vp, _Rest...> 2664 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 2665{}; 2666 2667// bullet 5 - Otherwise, there shall be no member `type`. 2668template <class...> struct common_reference {}; 2669 2670#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 2671 2672// is_assignable 2673 2674template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG _Tp type; }; 2675 2676#if __has_keyword(__is_assignable) 2677 2678template<class _Tp, class _Up> 2679struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { }; 2680 2681#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2682template <class _Tp, class _Arg> 2683_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v = __is_assignable(_Tp, _Arg); 2684#endif 2685 2686#else // __has_keyword(__is_assignable) 2687 2688template <class _Tp, class _Arg> 2689typename __select_2nd<decltype((declval<_Tp>() = declval<_Arg>())), true_type>::type 2690__is_assignable_test(int); 2691 2692template <class, class> 2693false_type __is_assignable_test(...); 2694 2695 2696template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2697struct __is_assignable_imp 2698 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2699 2700template <class _Tp, class _Arg> 2701struct __is_assignable_imp<_Tp, _Arg, true> 2702 : public false_type 2703{ 2704}; 2705 2706template <class _Tp, class _Arg> 2707struct is_assignable 2708 : public __is_assignable_imp<_Tp, _Arg> {}; 2709 2710#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2711template <class _Tp, class _Arg> 2712_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v 2713 = is_assignable<_Tp, _Arg>::value; 2714#endif 2715 2716#endif // __has_keyword(__is_assignable) 2717 2718// is_copy_assignable 2719 2720template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2721 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2722 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2723 2724#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2725template <class _Tp> 2726_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_assignable_v 2727 = is_copy_assignable<_Tp>::value; 2728#endif 2729 2730// is_move_assignable 2731 2732template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2733 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2734 typename add_rvalue_reference<_Tp>::type> {}; 2735 2736#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2737template <class _Tp> 2738_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_assignable_v 2739 = is_move_assignable<_Tp>::value; 2740#endif 2741 2742// is_destructible 2743 2744#if __has_keyword(__is_destructible) 2745 2746template<class _Tp> 2747struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 2748 2749#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2750template <class _Tp> 2751_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v = __is_destructible(_Tp); 2752#endif 2753 2754#else // __has_keyword(__is_destructible) 2755 2756// if it's a reference, return true 2757// if it's a function, return false 2758// if it's void, return false 2759// if it's an array of unknown bound, return false 2760// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 2761// where _Up is remove_all_extents<_Tp>::type 2762 2763template <class> 2764struct __is_destructible_apply { typedef int type; }; 2765 2766template <typename _Tp> 2767struct __is_destructor_wellformed { 2768 template <typename _Tp1> 2769 static char __test ( 2770 typename __is_destructible_apply<decltype(declval<_Tp1&>().~_Tp1())>::type 2771 ); 2772 2773 template <typename _Tp1> 2774 static __two __test (...); 2775 2776 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2777}; 2778 2779template <class _Tp, bool> 2780struct __destructible_imp; 2781 2782template <class _Tp> 2783struct __destructible_imp<_Tp, false> 2784 : public integral_constant<bool, 2785 __is_destructor_wellformed<typename remove_all_extents<_Tp>::type>::value> {}; 2786 2787template <class _Tp> 2788struct __destructible_imp<_Tp, true> 2789 : public true_type {}; 2790 2791template <class _Tp, bool> 2792struct __destructible_false; 2793 2794template <class _Tp> 2795struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, is_reference<_Tp>::value> {}; 2796 2797template <class _Tp> 2798struct __destructible_false<_Tp, true> : public false_type {}; 2799 2800template <class _Tp> 2801struct is_destructible 2802 : public __destructible_false<_Tp, is_function<_Tp>::value> {}; 2803 2804template <class _Tp> 2805struct is_destructible<_Tp[]> 2806 : public false_type {}; 2807 2808template <> 2809struct is_destructible<void> 2810 : public false_type {}; 2811 2812#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2813template <class _Tp> 2814_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v 2815 = is_destructible<_Tp>::value; 2816#endif 2817 2818#endif // __has_keyword(__is_destructible) 2819 2820template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2821struct __member_pointer_traits_imp 2822{ 2823}; 2824 2825template <class _Rp, class _Class, class ..._Param> 2826struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 2827{ 2828 typedef _Class _ClassType; 2829 typedef _Rp _ReturnType; 2830 typedef _Rp (_FnType) (_Param...); 2831}; 2832 2833template <class _Rp, class _Class, class ..._Param> 2834struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 2835{ 2836 typedef _Class _ClassType; 2837 typedef _Rp _ReturnType; 2838 typedef _Rp (_FnType) (_Param..., ...); 2839}; 2840 2841template <class _Rp, class _Class, class ..._Param> 2842struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 2843{ 2844 typedef _Class const _ClassType; 2845 typedef _Rp _ReturnType; 2846 typedef _Rp (_FnType) (_Param...); 2847}; 2848 2849template <class _Rp, class _Class, class ..._Param> 2850struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 2851{ 2852 typedef _Class const _ClassType; 2853 typedef _Rp _ReturnType; 2854 typedef _Rp (_FnType) (_Param..., ...); 2855}; 2856 2857template <class _Rp, class _Class, class ..._Param> 2858struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 2859{ 2860 typedef _Class volatile _ClassType; 2861 typedef _Rp _ReturnType; 2862 typedef _Rp (_FnType) (_Param...); 2863}; 2864 2865template <class _Rp, class _Class, class ..._Param> 2866struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 2867{ 2868 typedef _Class volatile _ClassType; 2869 typedef _Rp _ReturnType; 2870 typedef _Rp (_FnType) (_Param..., ...); 2871}; 2872 2873template <class _Rp, class _Class, class ..._Param> 2874struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 2875{ 2876 typedef _Class const volatile _ClassType; 2877 typedef _Rp _ReturnType; 2878 typedef _Rp (_FnType) (_Param...); 2879}; 2880 2881template <class _Rp, class _Class, class ..._Param> 2882struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2883{ 2884 typedef _Class const volatile _ClassType; 2885 typedef _Rp _ReturnType; 2886 typedef _Rp (_FnType) (_Param..., ...); 2887}; 2888 2889#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2890 2891template <class _Rp, class _Class, class ..._Param> 2892struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 2893{ 2894 typedef _Class& _ClassType; 2895 typedef _Rp _ReturnType; 2896 typedef _Rp (_FnType) (_Param...); 2897}; 2898 2899template <class _Rp, class _Class, class ..._Param> 2900struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 2901{ 2902 typedef _Class& _ClassType; 2903 typedef _Rp _ReturnType; 2904 typedef _Rp (_FnType) (_Param..., ...); 2905}; 2906 2907template <class _Rp, class _Class, class ..._Param> 2908struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 2909{ 2910 typedef _Class const& _ClassType; 2911 typedef _Rp _ReturnType; 2912 typedef _Rp (_FnType) (_Param...); 2913}; 2914 2915template <class _Rp, class _Class, class ..._Param> 2916struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 2917{ 2918 typedef _Class const& _ClassType; 2919 typedef _Rp _ReturnType; 2920 typedef _Rp (_FnType) (_Param..., ...); 2921}; 2922 2923template <class _Rp, class _Class, class ..._Param> 2924struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 2925{ 2926 typedef _Class volatile& _ClassType; 2927 typedef _Rp _ReturnType; 2928 typedef _Rp (_FnType) (_Param...); 2929}; 2930 2931template <class _Rp, class _Class, class ..._Param> 2932struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 2933{ 2934 typedef _Class volatile& _ClassType; 2935 typedef _Rp _ReturnType; 2936 typedef _Rp (_FnType) (_Param..., ...); 2937}; 2938 2939template <class _Rp, class _Class, class ..._Param> 2940struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 2941{ 2942 typedef _Class const volatile& _ClassType; 2943 typedef _Rp _ReturnType; 2944 typedef _Rp (_FnType) (_Param...); 2945}; 2946 2947template <class _Rp, class _Class, class ..._Param> 2948struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 2949{ 2950 typedef _Class const volatile& _ClassType; 2951 typedef _Rp _ReturnType; 2952 typedef _Rp (_FnType) (_Param..., ...); 2953}; 2954 2955template <class _Rp, class _Class, class ..._Param> 2956struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 2957{ 2958 typedef _Class&& _ClassType; 2959 typedef _Rp _ReturnType; 2960 typedef _Rp (_FnType) (_Param...); 2961}; 2962 2963template <class _Rp, class _Class, class ..._Param> 2964struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 2965{ 2966 typedef _Class&& _ClassType; 2967 typedef _Rp _ReturnType; 2968 typedef _Rp (_FnType) (_Param..., ...); 2969}; 2970 2971template <class _Rp, class _Class, class ..._Param> 2972struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 2973{ 2974 typedef _Class const&& _ClassType; 2975 typedef _Rp _ReturnType; 2976 typedef _Rp (_FnType) (_Param...); 2977}; 2978 2979template <class _Rp, class _Class, class ..._Param> 2980struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 2981{ 2982 typedef _Class const&& _ClassType; 2983 typedef _Rp _ReturnType; 2984 typedef _Rp (_FnType) (_Param..., ...); 2985}; 2986 2987template <class _Rp, class _Class, class ..._Param> 2988struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 2989{ 2990 typedef _Class volatile&& _ClassType; 2991 typedef _Rp _ReturnType; 2992 typedef _Rp (_FnType) (_Param...); 2993}; 2994 2995template <class _Rp, class _Class, class ..._Param> 2996struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 2997{ 2998 typedef _Class volatile&& _ClassType; 2999 typedef _Rp _ReturnType; 3000 typedef _Rp (_FnType) (_Param..., ...); 3001}; 3002 3003template <class _Rp, class _Class, class ..._Param> 3004struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 3005{ 3006 typedef _Class const volatile&& _ClassType; 3007 typedef _Rp _ReturnType; 3008 typedef _Rp (_FnType) (_Param...); 3009}; 3010 3011template <class _Rp, class _Class, class ..._Param> 3012struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 3013{ 3014 typedef _Class const volatile&& _ClassType; 3015 typedef _Rp _ReturnType; 3016 typedef _Rp (_FnType) (_Param..., ...); 3017}; 3018 3019#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 3020 3021 3022template <class _Rp, class _Class> 3023struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 3024{ 3025 typedef _Class _ClassType; 3026 typedef _Rp _ReturnType; 3027}; 3028 3029template <class _MP> 3030struct __member_pointer_traits 3031 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 3032 is_member_function_pointer<_MP>::value, 3033 is_member_object_pointer<_MP>::value> 3034{ 3035// typedef ... _ClassType; 3036// typedef ... _ReturnType; 3037// typedef ... _FnType; 3038}; 3039 3040 3041template <class _DecayedFp> 3042struct __member_pointer_class_type {}; 3043 3044template <class _Ret, class _ClassType> 3045struct __member_pointer_class_type<_Ret _ClassType::*> { 3046 typedef _ClassType type; 3047}; 3048 3049// template <class T, class... Args> struct is_constructible; 3050 3051template <class _Tp, class ..._Args> 3052struct _LIBCPP_TEMPLATE_VIS is_constructible 3053 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 3054{ }; 3055 3056#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3057template <class _Tp, class ..._Args> 3058_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_constructible_v 3059 = is_constructible<_Tp, _Args...>::value; 3060#endif 3061 3062// is_default_constructible 3063 3064template <class _Tp> 3065struct _LIBCPP_TEMPLATE_VIS is_default_constructible 3066 : public is_constructible<_Tp> 3067 {}; 3068 3069#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3070template <class _Tp> 3071_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_default_constructible_v 3072 = is_default_constructible<_Tp>::value; 3073#endif 3074 3075#ifndef _LIBCPP_CXX03_LANG 3076// First of all, we can't implement this check in C++03 mode because the {} 3077// default initialization syntax isn't valid. 3078// Second, we implement the trait in a funny manner with two defaulted template 3079// arguments to workaround Clang's PR43454. 3080template <class _Tp> 3081void __test_implicit_default_constructible(_Tp); 3082 3083template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 3084struct __is_implicitly_default_constructible 3085 : false_type 3086{ }; 3087 3088template <class _Tp> 3089struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 3090 : true_type 3091{ }; 3092 3093template <class _Tp> 3094struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 3095 : false_type 3096{ }; 3097#endif // !C++03 3098 3099// is_copy_constructible 3100 3101template <class _Tp> 3102struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 3103 : public is_constructible<_Tp, 3104 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3105 3106#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3107template <class _Tp> 3108_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_constructible_v 3109 = is_copy_constructible<_Tp>::value; 3110#endif 3111 3112// is_move_constructible 3113 3114template <class _Tp> 3115struct _LIBCPP_TEMPLATE_VIS is_move_constructible 3116 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3117 {}; 3118 3119#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3120template <class _Tp> 3121_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_constructible_v 3122 = is_move_constructible<_Tp>::value; 3123#endif 3124 3125// is_trivially_constructible 3126 3127template <class _Tp, class... _Args> 3128struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 3129 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 3130{ 3131}; 3132 3133#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3134template <class _Tp, class... _Args> 3135_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_constructible_v 3136 = is_trivially_constructible<_Tp, _Args...>::value; 3137#endif 3138 3139// is_trivially_default_constructible 3140 3141template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 3142 : public is_trivially_constructible<_Tp> 3143 {}; 3144 3145#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3146template <class _Tp> 3147_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_default_constructible_v 3148 = is_trivially_default_constructible<_Tp>::value; 3149#endif 3150 3151// is_trivially_copy_constructible 3152 3153template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 3154 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 3155 {}; 3156 3157#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3158template <class _Tp> 3159_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_constructible_v 3160 = is_trivially_copy_constructible<_Tp>::value; 3161#endif 3162 3163// is_trivially_move_constructible 3164 3165template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 3166 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3167 {}; 3168 3169#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3170template <class _Tp> 3171_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_constructible_v 3172 = is_trivially_move_constructible<_Tp>::value; 3173#endif 3174 3175// is_trivially_assignable 3176 3177template <class _Tp, class _Arg> 3178struct is_trivially_assignable 3179 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 3180{ }; 3181 3182#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3183template <class _Tp, class _Arg> 3184_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_assignable_v 3185 = is_trivially_assignable<_Tp, _Arg>::value; 3186#endif 3187 3188// is_trivially_copy_assignable 3189 3190template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 3191 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3192 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3193 3194#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3195template <class _Tp> 3196_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_assignable_v 3197 = is_trivially_copy_assignable<_Tp>::value; 3198#endif 3199 3200// is_trivially_move_assignable 3201 3202template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3203 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3204 typename add_rvalue_reference<_Tp>::type> 3205 {}; 3206 3207#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3208template <class _Tp> 3209_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_assignable_v 3210 = is_trivially_move_assignable<_Tp>::value; 3211#endif 3212 3213// is_trivially_destructible 3214 3215#if __has_keyword(__is_trivially_destructible) 3216 3217template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3218 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3219 3220#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3221 3222template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3223 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3224 3225#else 3226 3227template <class _Tp> struct __libcpp_trivial_destructor 3228 : public integral_constant<bool, is_scalar<_Tp>::value || 3229 is_reference<_Tp>::value> {}; 3230 3231template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3232 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3233 3234template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3235 : public false_type {}; 3236 3237#endif 3238 3239#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3240template <class _Tp> 3241_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_destructible_v 3242 = is_trivially_destructible<_Tp>::value; 3243#endif 3244 3245// is_nothrow_constructible 3246 3247#if __has_keyword(__is_nothrow_constructible) 3248 3249template <class _Tp, class... _Args> 3250struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3251 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3252 3253#else 3254 3255template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3256 3257template <class _Tp, class... _Args> 3258struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3259 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3260{ 3261}; 3262 3263template <class _Tp> 3264void __implicit_conversion_to(_Tp) noexcept { } 3265 3266template <class _Tp, class _Arg> 3267struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3268 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3269{ 3270}; 3271 3272template <class _Tp, bool _IsReference, class... _Args> 3273struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3274 : public false_type 3275{ 3276}; 3277 3278template <class _Tp, class... _Args> 3279struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3280 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3281{ 3282}; 3283 3284template <class _Tp, size_t _Ns> 3285struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3286 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3287{ 3288}; 3289 3290#endif // _LIBCPP_HAS_NO_NOEXCEPT 3291 3292 3293#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3294template <class _Tp, class ..._Args> 3295_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_constructible_v 3296 = is_nothrow_constructible<_Tp, _Args...>::value; 3297#endif 3298 3299// is_nothrow_default_constructible 3300 3301template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3302 : public is_nothrow_constructible<_Tp> 3303 {}; 3304 3305#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3306template <class _Tp> 3307_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_default_constructible_v 3308 = is_nothrow_default_constructible<_Tp>::value; 3309#endif 3310 3311// is_nothrow_copy_constructible 3312 3313template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3314 : public is_nothrow_constructible<_Tp, 3315 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3316 3317#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3318template <class _Tp> 3319_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_constructible_v 3320 = is_nothrow_copy_constructible<_Tp>::value; 3321#endif 3322 3323// is_nothrow_move_constructible 3324 3325template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3326 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3327 {}; 3328 3329#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3330template <class _Tp> 3331_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_constructible_v 3332 = is_nothrow_move_constructible<_Tp>::value; 3333#endif 3334 3335// is_nothrow_assignable 3336 3337#if __has_keyword(__is_nothrow_assignable) 3338 3339template <class _Tp, class _Arg> 3340struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3341 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3342 3343#else 3344 3345template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3346 3347template <class _Tp, class _Arg> 3348struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3349 : public false_type 3350{ 3351}; 3352 3353template <class _Tp, class _Arg> 3354struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3355 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Arg>()) > 3356{ 3357}; 3358 3359template <class _Tp, class _Arg> 3360struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3361 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3362{ 3363}; 3364 3365#endif // _LIBCPP_HAS_NO_NOEXCEPT 3366 3367#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3368template <class _Tp, class _Arg> 3369_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_assignable_v 3370 = is_nothrow_assignable<_Tp, _Arg>::value; 3371#endif 3372 3373// is_nothrow_copy_assignable 3374 3375template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3376 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3377 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3378 3379#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3380template <class _Tp> 3381_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_assignable_v 3382 = is_nothrow_copy_assignable<_Tp>::value; 3383#endif 3384 3385// is_nothrow_move_assignable 3386 3387template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 3388 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3389 typename add_rvalue_reference<_Tp>::type> 3390 {}; 3391 3392#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3393template <class _Tp> 3394_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_assignable_v 3395 = is_nothrow_move_assignable<_Tp>::value; 3396#endif 3397 3398// is_nothrow_destructible 3399 3400#if !defined(_LIBCPP_CXX03_LANG) 3401 3402template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3403 3404template <class _Tp> 3405struct __libcpp_is_nothrow_destructible<false, _Tp> 3406 : public false_type 3407{ 3408}; 3409 3410template <class _Tp> 3411struct __libcpp_is_nothrow_destructible<true, _Tp> 3412 : public integral_constant<bool, noexcept(declval<_Tp>().~_Tp()) > 3413{ 3414}; 3415 3416template <class _Tp> 3417struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3418 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3419{ 3420}; 3421 3422template <class _Tp, size_t _Ns> 3423struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3424 : public is_nothrow_destructible<_Tp> 3425{ 3426}; 3427 3428template <class _Tp> 3429struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3430 : public true_type 3431{ 3432}; 3433 3434template <class _Tp> 3435struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3436 : public true_type 3437{ 3438}; 3439 3440#else 3441 3442template <class _Tp> struct __libcpp_nothrow_destructor 3443 : public integral_constant<bool, is_scalar<_Tp>::value || 3444 is_reference<_Tp>::value> {}; 3445 3446template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3447 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3448 3449template <class _Tp> 3450struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3451 : public false_type {}; 3452 3453#endif 3454 3455#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3456template <class _Tp> 3457_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_destructible_v 3458 = is_nothrow_destructible<_Tp>::value; 3459#endif 3460 3461// is_pod 3462 3463#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3464 3465template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3466 : public integral_constant<bool, __is_pod(_Tp)> {}; 3467 3468#else 3469 3470template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3471 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3472 is_trivially_copy_constructible<_Tp>::value && 3473 is_trivially_copy_assignable<_Tp>::value && 3474 is_trivially_destructible<_Tp>::value> {}; 3475 3476#endif 3477 3478#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3479template <class _Tp> 3480_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pod_v 3481 = is_pod<_Tp>::value; 3482#endif 3483 3484// is_literal_type; 3485 3486#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3487template <class _Tp> struct _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 is_literal_type 3488 : public integral_constant<bool, __is_literal_type(_Tp)> 3489 {}; 3490 3491#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3492template <class _Tp> 3493_LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_literal_type_v 3494 = is_literal_type<_Tp>::value; 3495#endif // _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3496#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3497 3498// is_standard_layout; 3499 3500template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3501#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3502 : public integral_constant<bool, __is_standard_layout(_Tp)> 3503#else 3504 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3505#endif 3506 {}; 3507 3508#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3509template <class _Tp> 3510_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_standard_layout_v 3511 = is_standard_layout<_Tp>::value; 3512#endif 3513 3514// is_trivially_copyable; 3515 3516template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3517 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3518 {}; 3519 3520#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3521template <class _Tp> 3522_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copyable_v 3523 = is_trivially_copyable<_Tp>::value; 3524#endif 3525 3526// is_trivial; 3527 3528template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3529#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3530 : public integral_constant<bool, __is_trivial(_Tp)> 3531#else 3532 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3533 is_trivially_default_constructible<_Tp>::value> 3534#endif 3535 {}; 3536 3537#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3538template <class _Tp> 3539_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivial_v 3540 = is_trivial<_Tp>::value; 3541#endif 3542 3543template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3544template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3545template <class _Tp> struct __is_reference_wrapper 3546 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3547 3548#ifndef _LIBCPP_CXX03_LANG 3549 3550template <class _Fp, class _A0, 3551 class _DecayFp = typename decay<_Fp>::type, 3552 class _DecayA0 = typename decay<_A0>::type, 3553 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3554using __enable_if_bullet1 = typename enable_if 3555 < 3556 is_member_function_pointer<_DecayFp>::value 3557 && is_base_of<_ClassT, _DecayA0>::value 3558 >::type; 3559 3560template <class _Fp, class _A0, 3561 class _DecayFp = typename decay<_Fp>::type, 3562 class _DecayA0 = typename decay<_A0>::type> 3563using __enable_if_bullet2 = typename enable_if 3564 < 3565 is_member_function_pointer<_DecayFp>::value 3566 && __is_reference_wrapper<_DecayA0>::value 3567 >::type; 3568 3569template <class _Fp, class _A0, 3570 class _DecayFp = typename decay<_Fp>::type, 3571 class _DecayA0 = typename decay<_A0>::type, 3572 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3573using __enable_if_bullet3 = typename enable_if 3574 < 3575 is_member_function_pointer<_DecayFp>::value 3576 && !is_base_of<_ClassT, _DecayA0>::value 3577 && !__is_reference_wrapper<_DecayA0>::value 3578 >::type; 3579 3580template <class _Fp, class _A0, 3581 class _DecayFp = typename decay<_Fp>::type, 3582 class _DecayA0 = typename decay<_A0>::type, 3583 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3584using __enable_if_bullet4 = typename enable_if 3585 < 3586 is_member_object_pointer<_DecayFp>::value 3587 && is_base_of<_ClassT, _DecayA0>::value 3588 >::type; 3589 3590template <class _Fp, class _A0, 3591 class _DecayFp = typename decay<_Fp>::type, 3592 class _DecayA0 = typename decay<_A0>::type> 3593using __enable_if_bullet5 = typename enable_if 3594 < 3595 is_member_object_pointer<_DecayFp>::value 3596 && __is_reference_wrapper<_DecayA0>::value 3597 >::type; 3598 3599template <class _Fp, class _A0, 3600 class _DecayFp = typename decay<_Fp>::type, 3601 class _DecayA0 = typename decay<_A0>::type, 3602 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3603using __enable_if_bullet6 = typename enable_if 3604 < 3605 is_member_object_pointer<_DecayFp>::value 3606 && !is_base_of<_ClassT, _DecayA0>::value 3607 && !__is_reference_wrapper<_DecayA0>::value 3608 >::type; 3609 3610// __invoke forward declarations 3611 3612// fall back - none of the bullets 3613 3614template <class ..._Args> 3615auto __invoke(__any, _Args&& ...__args) -> __nat; 3616 3617template <class ..._Args> 3618auto __invoke_constexpr(__any, _Args&& ...__args) -> __nat; 3619 3620// bullets 1, 2 and 3 3621 3622template <class _Fp, class _A0, class ..._Args, 3623 class = __enable_if_bullet1<_Fp, _A0>> 3624inline _LIBCPP_INLINE_VISIBILITY 3625_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3626__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3627 noexcept(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...))) 3628 -> decltype( (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)) 3629 { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); } 3630 3631template <class _Fp, class _A0, class ..._Args, 3632 class = __enable_if_bullet1<_Fp, _A0>> 3633inline _LIBCPP_INLINE_VISIBILITY 3634_LIBCPP_CONSTEXPR auto 3635__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3636 noexcept(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...))) 3637 -> decltype( (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)) 3638 { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); } 3639 3640template <class _Fp, class _A0, class ..._Args, 3641 class = __enable_if_bullet2<_Fp, _A0>> 3642inline _LIBCPP_INLINE_VISIBILITY 3643_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3644__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3645 noexcept(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...))) 3646 -> decltype( (__a0.get().*__f)(static_cast<_Args&&>(__args)...)) 3647 { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); } 3648 3649template <class _Fp, class _A0, class ..._Args, 3650 class = __enable_if_bullet2<_Fp, _A0>> 3651inline _LIBCPP_INLINE_VISIBILITY 3652_LIBCPP_CONSTEXPR auto 3653__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3654 noexcept(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...))) 3655 -> decltype( (__a0.get().*__f)(static_cast<_Args&&>(__args)...)) 3656 { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); } 3657 3658template <class _Fp, class _A0, class ..._Args, 3659 class = __enable_if_bullet3<_Fp, _A0>> 3660inline _LIBCPP_INLINE_VISIBILITY 3661_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3662__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3663 noexcept(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...))) 3664 -> decltype( ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)) 3665 { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); } 3666 3667template <class _Fp, class _A0, class ..._Args, 3668 class = __enable_if_bullet3<_Fp, _A0>> 3669inline _LIBCPP_INLINE_VISIBILITY 3670_LIBCPP_CONSTEXPR auto 3671__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3672 noexcept(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...))) 3673 -> decltype( ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)) 3674 { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); } 3675 3676// bullets 4, 5 and 6 3677 3678template <class _Fp, class _A0, 3679 class = __enable_if_bullet4<_Fp, _A0>> 3680inline _LIBCPP_INLINE_VISIBILITY 3681_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3682__invoke(_Fp&& __f, _A0&& __a0) 3683 noexcept(noexcept(static_cast<_A0&&>(__a0).*__f)) 3684 -> decltype( static_cast<_A0&&>(__a0).*__f) 3685 { return static_cast<_A0&&>(__a0).*__f; } 3686 3687template <class _Fp, class _A0, 3688 class = __enable_if_bullet4<_Fp, _A0>> 3689inline _LIBCPP_INLINE_VISIBILITY 3690_LIBCPP_CONSTEXPR auto 3691__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3692 noexcept(noexcept(static_cast<_A0&&>(__a0).*__f)) 3693 -> decltype( static_cast<_A0&&>(__a0).*__f) 3694 { return static_cast<_A0&&>(__a0).*__f; } 3695 3696template <class _Fp, class _A0, 3697 class = __enable_if_bullet5<_Fp, _A0>> 3698inline _LIBCPP_INLINE_VISIBILITY 3699_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3700__invoke(_Fp&& __f, _A0&& __a0) 3701 noexcept(noexcept(__a0.get().*__f)) 3702 -> decltype( __a0.get().*__f) 3703 { return __a0.get().*__f; } 3704 3705template <class _Fp, class _A0, 3706 class = __enable_if_bullet5<_Fp, _A0>> 3707inline _LIBCPP_INLINE_VISIBILITY 3708_LIBCPP_CONSTEXPR auto 3709__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3710 noexcept(noexcept(__a0.get().*__f)) 3711 -> decltype( __a0.get().*__f) 3712 { return __a0.get().*__f; } 3713 3714template <class _Fp, class _A0, 3715 class = __enable_if_bullet6<_Fp, _A0>> 3716inline _LIBCPP_INLINE_VISIBILITY 3717_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3718__invoke(_Fp&& __f, _A0&& __a0) 3719 noexcept(noexcept((*static_cast<_A0&&>(__a0)).*__f)) 3720 -> decltype( (*static_cast<_A0&&>(__a0)).*__f) 3721 { return (*static_cast<_A0&&>(__a0)).*__f; } 3722 3723template <class _Fp, class _A0, 3724 class = __enable_if_bullet6<_Fp, _A0>> 3725inline _LIBCPP_INLINE_VISIBILITY 3726_LIBCPP_CONSTEXPR auto 3727__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3728 noexcept(noexcept((*static_cast<_A0&&>(__a0)).*__f)) 3729 -> decltype( (*static_cast<_A0&&>(__a0)).*__f) 3730 { return (*static_cast<_A0&&>(__a0)).*__f; } 3731 3732// bullet 7 3733 3734template <class _Fp, class ..._Args> 3735inline _LIBCPP_INLINE_VISIBILITY 3736_LIBCPP_CONSTEXPR_AFTER_CXX17 auto 3737__invoke(_Fp&& __f, _Args&& ...__args) 3738 noexcept(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...))) 3739 -> decltype( static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)) 3740 { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); } 3741 3742template <class _Fp, class ..._Args> 3743inline _LIBCPP_INLINE_VISIBILITY 3744_LIBCPP_CONSTEXPR auto 3745__invoke_constexpr(_Fp&& __f, _Args&& ...__args) 3746 noexcept(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...))) 3747 -> decltype( static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)) 3748 { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); } 3749 3750// __invokable 3751template <class _Ret, class _Fp, class ..._Args> 3752struct __invokable_r 3753{ 3754 template <class _XFp, class ..._XArgs> 3755 static auto __try_call(int) -> decltype( 3756 _VSTD::__invoke(declval<_XFp>(), declval<_XArgs>()...)); 3757 template <class _XFp, class ..._XArgs> 3758 static __nat __try_call(...); 3759 3760 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3761 // or incomplete array types as required by the standard. 3762 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3763 3764 using type = 3765 typename conditional< 3766 _IsNotSame<_Result, __nat>::value, 3767 typename conditional< 3768 is_void<_Ret>::value, 3769 true_type, 3770 is_convertible<_Result, _Ret> 3771 >::type, 3772 false_type 3773 >::type; 3774 static const bool value = type::value; 3775}; 3776template <class _Fp, class ..._Args> 3777using __invokable = __invokable_r<void, _Fp, _Args...>; 3778 3779template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3780struct __nothrow_invokable_r_imp { 3781 static const bool value = false; 3782}; 3783 3784template <class _Ret, class _Fp, class ..._Args> 3785struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3786{ 3787 typedef __nothrow_invokable_r_imp _ThisT; 3788 3789 template <class _Tp> 3790 static void __test_noexcept(_Tp) noexcept; 3791 3792 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3793 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...))); 3794}; 3795 3796template <class _Ret, class _Fp, class ..._Args> 3797struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3798{ 3799 static const bool value = noexcept( 3800 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...)); 3801}; 3802 3803template <class _Ret, class _Fp, class ..._Args> 3804using __nothrow_invokable_r = 3805 __nothrow_invokable_r_imp< 3806 __invokable_r<_Ret, _Fp, _Args...>::value, 3807 is_void<_Ret>::value, 3808 _Ret, _Fp, _Args... 3809 >; 3810 3811template <class _Fp, class ..._Args> 3812using __nothrow_invokable = 3813 __nothrow_invokable_r_imp< 3814 __invokable<_Fp, _Args...>::value, 3815 true, void, _Fp, _Args... 3816 >; 3817 3818template <class _Fp, class ..._Args> 3819struct __invoke_of 3820 : public enable_if< 3821 __invokable<_Fp, _Args...>::value, 3822 typename __invokable_r<void, _Fp, _Args...>::_Result> 3823{ 3824}; 3825 3826#endif // _LIBCPP_CXX03_LANG 3827 3828// result_of 3829 3830#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3831template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 3832 3833#ifndef _LIBCPP_CXX03_LANG 3834 3835template <class _Fp, class ..._Args> 3836class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 3837 : public __invoke_of<_Fp, _Args...> 3838{ 3839}; 3840 3841#else // C++03 3842 3843template <class _Fn, bool, bool> 3844class __result_of 3845{ 3846}; 3847 3848template <class _Fn, class ..._Args> 3849class __result_of<_Fn(_Args...), true, false> 3850{ 3851public: 3852 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 3853}; 3854 3855template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 3856struct __result_of_mp; 3857 3858// member function pointer 3859 3860template <class _MP, class _Tp> 3861struct __result_of_mp<_MP, _Tp, true> 3862{ 3863 using type = typename __member_pointer_traits<_MP>::_ReturnType; 3864}; 3865 3866// member data pointer 3867 3868template <class _MP, class _Tp, bool> 3869struct __result_of_mdp; 3870 3871template <class _Rp, class _Class, class _Tp> 3872struct __result_of_mdp<_Rp _Class::*, _Tp, false> 3873{ 3874 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 3875}; 3876 3877template <class _Rp, class _Class, class _Tp> 3878struct __result_of_mdp<_Rp _Class::*, _Tp, true> 3879{ 3880 using type = typename __apply_cv<_Tp, _Rp>::type&; 3881}; 3882 3883template <class _Rp, class _Class, class _Tp> 3884struct __result_of_mp<_Rp _Class::*, _Tp, false> 3885 : public __result_of_mdp<_Rp _Class::*, _Tp, 3886 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 3887{ 3888}; 3889 3890template <class _Fn, class _Tp> 3891class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 3892 : public __result_of_mp<typename remove_reference<_Fn>::type, 3893 _Tp, 3894 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 3895{ 3896}; 3897 3898template <class _Fn, class _Tp, class ..._Args> 3899class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 3900 : public __result_of_mp<typename remove_reference<_Fn>::type, 3901 _Tp, 3902 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 3903{ 3904}; 3905 3906template <class _Fn, class ..._Args> 3907class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 3908 : public __result_of<_Fn(_Args...), 3909 is_class<typename remove_reference<_Fn>::type>::value || 3910 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 3911 is_member_pointer<typename remove_reference<_Fn>::type>::value 3912 > 3913{ 3914}; 3915 3916#endif // C++03 3917 3918#if _LIBCPP_STD_VER > 11 3919template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 3920#endif // _LIBCPP_STD_VER > 11 3921#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3922 3923#if _LIBCPP_STD_VER > 14 3924 3925// invoke_result 3926 3927template <class _Fn, class... _Args> 3928struct _LIBCPP_TEMPLATE_VIS invoke_result 3929 : __invoke_of<_Fn, _Args...> 3930{ 3931}; 3932 3933template <class _Fn, class... _Args> 3934using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 3935 3936// is_invocable 3937 3938template <class _Fn, class ..._Args> 3939struct _LIBCPP_TEMPLATE_VIS is_invocable 3940 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 3941 3942template <class _Ret, class _Fn, class ..._Args> 3943struct _LIBCPP_TEMPLATE_VIS is_invocable_r 3944 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 3945 3946template <class _Fn, class ..._Args> 3947_LIBCPP_INLINE_VAR constexpr bool is_invocable_v 3948 = is_invocable<_Fn, _Args...>::value; 3949 3950template <class _Ret, class _Fn, class ..._Args> 3951_LIBCPP_INLINE_VAR constexpr bool is_invocable_r_v 3952 = is_invocable_r<_Ret, _Fn, _Args...>::value; 3953 3954// is_nothrow_invocable 3955 3956template <class _Fn, class ..._Args> 3957struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 3958 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 3959 3960template <class _Ret, class _Fn, class ..._Args> 3961struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 3962 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 3963 3964template <class _Fn, class ..._Args> 3965_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_v 3966 = is_nothrow_invocable<_Fn, _Args...>::value; 3967 3968template <class _Ret, class _Fn, class ..._Args> 3969_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_r_v 3970 = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 3971 3972#endif // _LIBCPP_STD_VER > 14 3973 3974// __swappable 3975 3976template <class _Tp> struct __is_swappable; 3977template <class _Tp> struct __is_nothrow_swappable; 3978 3979 3980#ifndef _LIBCPP_CXX03_LANG 3981template <class _Tp> 3982using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 3983#else 3984template <class> 3985using __swap_result_t = void; 3986#endif 3987 3988template <class _Tp> 3989inline _LIBCPP_INLINE_VISIBILITY 3990_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 3991swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 3992 is_nothrow_move_assignable<_Tp>::value); 3993 3994template<class _Tp, size_t _Np> 3995inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3996typename enable_if< 3997 __is_swappable<_Tp>::value 3998>::type 3999swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 4000 4001namespace __detail 4002{ 4003// ALL generic swap overloads MUST already have a declaration available at this point. 4004 4005template <class _Tp, class _Up = _Tp, 4006 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 4007struct __swappable_with 4008{ 4009 template <class _LHS, class _RHS> 4010 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 4011 __test_swap(int); 4012 template <class, class> 4013 static __nat __test_swap(long); 4014 4015 // Extra parens are needed for the C++03 definition of decltype. 4016 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 4017 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 4018 4019 static const bool value = _IsNotSame<__swap1, __nat>::value 4020 && _IsNotSame<__swap2, __nat>::value; 4021}; 4022 4023template <class _Tp, class _Up> 4024struct __swappable_with<_Tp, _Up, false> : false_type {}; 4025 4026template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 4027struct __nothrow_swappable_with { 4028 static const bool value = 4029#ifndef _LIBCPP_HAS_NO_NOEXCEPT 4030 noexcept(swap(declval<_Tp>(), declval<_Up>())) 4031 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 4032#else 4033 false; 4034#endif 4035}; 4036 4037template <class _Tp, class _Up> 4038struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 4039 4040} // __detail 4041 4042template <class _Tp> 4043struct __is_swappable 4044 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 4045{ 4046}; 4047 4048template <class _Tp> 4049struct __is_nothrow_swappable 4050 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 4051{ 4052}; 4053 4054#if _LIBCPP_STD_VER > 14 4055 4056template <class _Tp, class _Up> 4057struct _LIBCPP_TEMPLATE_VIS is_swappable_with 4058 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 4059{ 4060}; 4061 4062template <class _Tp> 4063struct _LIBCPP_TEMPLATE_VIS is_swappable 4064 : public conditional< 4065 __is_referenceable<_Tp>::value, 4066 is_swappable_with< 4067 typename add_lvalue_reference<_Tp>::type, 4068 typename add_lvalue_reference<_Tp>::type>, 4069 false_type 4070 >::type 4071{ 4072}; 4073 4074template <class _Tp, class _Up> 4075struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 4076 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 4077{ 4078}; 4079 4080template <class _Tp> 4081struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 4082 : public conditional< 4083 __is_referenceable<_Tp>::value, 4084 is_nothrow_swappable_with< 4085 typename add_lvalue_reference<_Tp>::type, 4086 typename add_lvalue_reference<_Tp>::type>, 4087 false_type 4088 >::type 4089{ 4090}; 4091 4092template <class _Tp, class _Up> 4093_LIBCPP_INLINE_VAR constexpr bool is_swappable_with_v 4094 = is_swappable_with<_Tp, _Up>::value; 4095 4096template <class _Tp> 4097_LIBCPP_INLINE_VAR constexpr bool is_swappable_v 4098 = is_swappable<_Tp>::value; 4099 4100template <class _Tp, class _Up> 4101_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_with_v 4102 = is_nothrow_swappable_with<_Tp, _Up>::value; 4103 4104template <class _Tp> 4105_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_v 4106 = is_nothrow_swappable<_Tp>::value; 4107 4108#endif // _LIBCPP_STD_VER > 14 4109 4110template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 4111 4112template <class _Tp> 4113struct __underlying_type_impl<_Tp, false> {}; 4114 4115template <class _Tp> 4116struct __underlying_type_impl<_Tp, true> 4117{ 4118 typedef __underlying_type(_Tp) type; 4119}; 4120 4121template <class _Tp> 4122struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 4123 4124#if _LIBCPP_STD_VER > 11 4125template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 4126#endif 4127 4128template <class _Tp, bool = is_enum<_Tp>::value> 4129struct __sfinae_underlying_type 4130{ 4131 typedef typename underlying_type<_Tp>::type type; 4132 typedef decltype(((type)1) + 0) __promoted_type; 4133}; 4134 4135template <class _Tp> 4136struct __sfinae_underlying_type<_Tp, false> {}; 4137 4138inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4139int __convert_to_integral(int __val) { return __val; } 4140 4141inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4142unsigned __convert_to_integral(unsigned __val) { return __val; } 4143 4144inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4145long __convert_to_integral(long __val) { return __val; } 4146 4147inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4148unsigned long __convert_to_integral(unsigned long __val) { return __val; } 4149 4150inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4151long long __convert_to_integral(long long __val) { return __val; } 4152 4153inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4154unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 4155 4156template<typename _Fp> 4157inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4158typename enable_if<is_floating_point<_Fp>::value, long long>::type 4159 __convert_to_integral(_Fp __val) { return __val; } 4160 4161#ifndef _LIBCPP_HAS_NO_INT128 4162inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4163__int128_t __convert_to_integral(__int128_t __val) { return __val; } 4164 4165inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4166__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 4167#endif 4168 4169template <class _Tp> 4170inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 4171typename __sfinae_underlying_type<_Tp>::__promoted_type 4172__convert_to_integral(_Tp __val) { return __val; } 4173 4174// is_scoped_enum [meta.unary.prop] 4175 4176#if _LIBCPP_STD_VER > 20 4177template <class _Tp, bool = is_enum_v<_Tp> > 4178struct __is_scoped_enum_helper : false_type {}; 4179 4180template <class _Tp> 4181struct __is_scoped_enum_helper<_Tp, true> 4182 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 4183 4184template <class _Tp> 4185struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 4186 : public __is_scoped_enum_helper<_Tp> {}; 4187 4188template <class _Tp> 4189_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scoped_enum_v = 4190 is_scoped_enum<_Tp>::value; 4191#endif 4192 4193#if _LIBCPP_STD_VER > 14 4194 4195template <class... _Args> 4196struct conjunction : _And<_Args...> {}; 4197template<class... _Args> 4198_LIBCPP_INLINE_VAR constexpr bool conjunction_v 4199 = conjunction<_Args...>::value; 4200 4201template <class... _Args> 4202struct disjunction : _Or<_Args...> {}; 4203template<class... _Args> 4204_LIBCPP_INLINE_VAR constexpr bool disjunction_v 4205 = disjunction<_Args...>::value; 4206 4207template <class _Tp> 4208struct negation : _Not<_Tp> {}; 4209template<class _Tp> 4210_LIBCPP_INLINE_VAR constexpr bool negation_v 4211 = negation<_Tp>::value; 4212#endif // _LIBCPP_STD_VER > 14 4213 4214// These traits are used in __tree and __hash_table 4215struct __extract_key_fail_tag {}; 4216struct __extract_key_self_tag {}; 4217struct __extract_key_first_tag {}; 4218 4219template <class _ValTy, class _Key, 4220 class _RawValTy = typename __unconstref<_ValTy>::type> 4221struct __can_extract_key 4222 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 4223 __extract_key_fail_tag>::type {}; 4224 4225template <class _Pair, class _Key, class _First, class _Second> 4226struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 4227 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 4228 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 4229 4230// __can_extract_map_key uses true_type/false_type instead of the tags. 4231// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 4232// and _ValTy == _Key. 4233template <class _ValTy, class _Key, class _ContainerValueTy, 4234 class _RawValTy = typename __unconstref<_ValTy>::type> 4235struct __can_extract_map_key 4236 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 4237 4238// This specialization returns __extract_key_fail_tag for non-map containers 4239// because _Key == _ContainerValueTy 4240template <class _ValTy, class _Key, class _RawValTy> 4241struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 4242 : false_type {}; 4243 4244#if _LIBCPP_STD_VER > 17 4245_LIBCPP_INLINE_VISIBILITY 4246inline constexpr bool is_constant_evaluated() noexcept { 4247 return __builtin_is_constant_evaluated(); 4248} 4249#endif 4250 4251inline _LIBCPP_CONSTEXPR 4252bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 4253 4254template <class _CharT> 4255using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 4256 4257template<class _Tp> 4258using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 4259 4260#if _LIBCPP_STD_VER > 17 4261template<bool _Const, class _Tp> 4262using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 4263#endif // _LIBCPP_STD_VER > 17 4264 4265_LIBCPP_END_NAMESPACE_STD 4266 4267#if _LIBCPP_STD_VER > 14 4268// std::byte 4269namespace std // purposefully not versioned 4270{ 4271 4272 4273} 4274#endif 4275 4276#endif // _LIBCPP_TYPE_TRAITS 4277