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