type_traits revision 360784
1// -*- C++ -*- 2//===------------------------ type_traits ---------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TYPE_TRAITS 11#define _LIBCPP_TYPE_TRAITS 12 13/* 14 type_traits synopsis 15 16namespace std 17{ 18 19 // helper class: 20 template <class T, T v> struct integral_constant; 21 typedef integral_constant<bool, true> true_type; // C++11 22 typedef integral_constant<bool, false> false_type; // C++11 23 24 template <bool B> // C++14 25 using bool_constant = integral_constant<bool, B>; // C++14 26 typedef bool_constant<true> true_type; // C++14 27 typedef bool_constant<false> false_type; // C++14 28 29 // helper traits 30 template <bool, class T = void> struct enable_if; 31 template <bool, class T, class F> struct conditional; 32 33 // Primary classification traits: 34 template <class T> struct is_void; 35 template <class T> struct is_null_pointer; // C++14 36 template <class T> struct is_integral; 37 template <class T> struct is_floating_point; 38 template <class T> struct is_array; 39 template <class T> struct is_pointer; 40 template <class T> struct is_lvalue_reference; 41 template <class T> struct is_rvalue_reference; 42 template <class T> struct is_member_object_pointer; 43 template <class T> struct is_member_function_pointer; 44 template <class T> struct is_enum; 45 template <class T> struct is_union; 46 template <class T> struct is_class; 47 template <class T> struct is_function; 48 49 // Secondary classification traits: 50 template <class T> struct is_reference; 51 template <class T> struct is_arithmetic; 52 template <class T> struct is_fundamental; 53 template <class T> struct is_member_pointer; 54 template <class T> struct is_scalar; 55 template <class T> struct is_object; 56 template <class T> struct is_compound; 57 58 // Const-volatile properties and transformations: 59 template <class T> struct is_const; 60 template <class T> struct is_volatile; 61 template <class T> struct remove_const; 62 template <class T> struct remove_volatile; 63 template <class T> struct remove_cv; 64 template <class T> struct add_const; 65 template <class T> struct add_volatile; 66 template <class T> struct add_cv; 67 68 // Reference transformations: 69 template <class T> struct remove_reference; 70 template <class T> struct add_lvalue_reference; 71 template <class T> struct add_rvalue_reference; 72 73 // Pointer transformations: 74 template <class T> struct remove_pointer; 75 template <class T> struct add_pointer; 76 77 template<class T> struct type_identity; // C++20 78 template<class T> 79 using type_identity_t = typename type_identity<T>::type; // C++20 80 81 // Integral properties: 82 template <class T> struct is_signed; 83 template <class T> struct is_unsigned; 84 template <class T> struct make_signed; 85 template <class T> struct make_unsigned; 86 87 // Array properties and transformations: 88 template <class T> struct rank; 89 template <class T, unsigned I = 0> struct extent; 90 template <class T> struct remove_extent; 91 template <class T> struct remove_all_extents; 92 93 template <class T> struct is_bounded_array; // C++20 94 template <class T> struct is_unbounded_array; // C++20 95 96 // Member introspection: 97 template <class T> struct is_pod; 98 template <class T> struct is_trivial; 99 template <class T> struct is_trivially_copyable; 100 template <class T> struct is_standard_layout; 101 template <class T> struct is_literal_type; 102 template <class T> struct is_empty; 103 template <class T> struct is_polymorphic; 104 template <class T> struct is_abstract; 105 template <class T> struct is_final; // C++14 106 template <class T> struct is_aggregate; // C++17 107 108 template <class T, class... Args> struct is_constructible; 109 template <class T> struct is_default_constructible; 110 template <class T> struct is_copy_constructible; 111 template <class T> struct is_move_constructible; 112 template <class T, class U> struct is_assignable; 113 template <class T> struct is_copy_assignable; 114 template <class T> struct is_move_assignable; 115 template <class T, class U> struct is_swappable_with; // C++17 116 template <class T> struct is_swappable; // C++17 117 template <class T> struct is_destructible; 118 119 template <class T, class... Args> struct is_trivially_constructible; 120 template <class T> struct is_trivially_default_constructible; 121 template <class T> struct is_trivially_copy_constructible; 122 template <class T> struct is_trivially_move_constructible; 123 template <class T, class U> struct is_trivially_assignable; 124 template <class T> struct is_trivially_copy_assignable; 125 template <class T> struct is_trivially_move_assignable; 126 template <class T> struct is_trivially_destructible; 127 128 template <class T, class... Args> struct is_nothrow_constructible; 129 template <class T> struct is_nothrow_default_constructible; 130 template <class T> struct is_nothrow_copy_constructible; 131 template <class T> struct is_nothrow_move_constructible; 132 template <class T, class U> struct is_nothrow_assignable; 133 template <class T> struct is_nothrow_copy_assignable; 134 template <class T> struct is_nothrow_move_assignable; 135 template <class T, class U> struct is_nothrow_swappable_with; // C++17 136 template <class T> struct is_nothrow_swappable; // C++17 137 template <class T> struct is_nothrow_destructible; 138 139 template <class T> struct has_virtual_destructor; 140 141 template<class T> struct has_unique_object_representations; // C++17 142 143 // Relationships between types: 144 template <class T, class U> struct is_same; 145 template <class Base, class Derived> struct is_base_of; 146 147 template <class From, class To> struct is_convertible; 148 template <typename From, typename To> struct is_nothrow_convertible; // C++20 149 template <typename From, typename To> inline constexpr bool is_nothrow_convertible_v; // C++20 150 151 template <class Fn, class... ArgTypes> struct is_invocable; 152 template <class R, class Fn, class... ArgTypes> struct is_invocable_r; 153 154 template <class Fn, class... ArgTypes> struct is_nothrow_invocable; 155 template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r; 156 157 // Alignment properties and transformations: 158 template <class T> struct alignment_of; 159 template <size_t Len, size_t Align = most_stringent_alignment_requirement> 160 struct aligned_storage; 161 template <size_t Len, class... Types> struct aligned_union; 162 template <class T> struct remove_cvref; // C++20 163 164 template <class T> struct decay; 165 template <class... T> struct common_type; 166 template <class T> struct underlying_type; 167 template <class> class result_of; // undefined 168 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; 169 template <class Fn, class... ArgTypes> struct invoke_result; // C++17 170 171 // const-volatile modifications: 172 template <class T> 173 using remove_const_t = typename remove_const<T>::type; // C++14 174 template <class T> 175 using remove_volatile_t = typename remove_volatile<T>::type; // C++14 176 template <class T> 177 using remove_cv_t = typename remove_cv<T>::type; // C++14 178 template <class T> 179 using add_const_t = typename add_const<T>::type; // C++14 180 template <class T> 181 using add_volatile_t = typename add_volatile<T>::type; // C++14 182 template <class T> 183 using add_cv_t = typename add_cv<T>::type; // C++14 184 185 // reference modifications: 186 template <class T> 187 using remove_reference_t = typename remove_reference<T>::type; // C++14 188 template <class T> 189 using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; // C++14 190 template <class T> 191 using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; // C++14 192 193 // sign modifications: 194 template <class T> 195 using make_signed_t = typename make_signed<T>::type; // C++14 196 template <class T> 197 using make_unsigned_t = typename make_unsigned<T>::type; // C++14 198 199 // array modifications: 200 template <class T> 201 using remove_extent_t = typename remove_extent<T>::type; // C++14 202 template <class T> 203 using remove_all_extents_t = typename remove_all_extents<T>::type; // C++14 204 205 template <class T> 206 inline constexpr bool is_bounded_array_v 207 = is_bounded_array<T>::value; // C++20 208 inline constexpr bool is_unbounded_array_v 209 = is_unbounded_array<T>::value; // C++20 210 211 // pointer modifications: 212 template <class T> 213 using remove_pointer_t = typename remove_pointer<T>::type; // C++14 214 template <class T> 215 using add_pointer_t = typename add_pointer<T>::type; // C++14 216 217 // other transformations: 218 template <size_t Len, std::size_t Align=default-alignment> 219 using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14 220 template <std::size_t Len, class... Types> 221 using aligned_union_t = typename aligned_union<Len,Types...>::type; // C++14 222 template <class T> 223 using remove_cvref_t = typename remove_cvref<T>::type; // C++20 224 template <class T> 225 using decay_t = typename decay<T>::type; // C++14 226 template <bool b, class T=void> 227 using enable_if_t = typename enable_if<b,T>::type; // C++14 228 template <bool b, class T, class F> 229 using conditional_t = typename conditional<b,T,F>::type; // C++14 230 template <class... T> 231 using common_type_t = typename common_type<T...>::type; // C++14 232 template <class T> 233 using underlying_type_t = typename underlying_type<T>::type; // C++14 234 template <class T> 235 using result_of_t = typename result_of<T>::type; // C++14 236 template <class Fn, class... ArgTypes> 237 using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; // C++17 238 239 template <class...> 240 using void_t = void; // C++17 241 242 // See C++14 20.10.4.1, primary type categories 243 template <class T> inline constexpr bool is_void_v 244 = is_void<T>::value; // C++17 245 template <class T> inline constexpr bool is_null_pointer_v 246 = is_null_pointer<T>::value; // C++17 247 template <class T> inline constexpr bool is_integral_v 248 = is_integral<T>::value; // C++17 249 template <class T> inline constexpr bool is_floating_point_v 250 = is_floating_point<T>::value; // C++17 251 template <class T> inline constexpr bool is_array_v 252 = is_array<T>::value; // C++17 253 template <class T> inline constexpr bool is_pointer_v 254 = is_pointer<T>::value; // C++17 255 template <class T> inline constexpr bool is_lvalue_reference_v 256 = is_lvalue_reference<T>::value; // C++17 257 template <class T> inline constexpr bool is_rvalue_reference_v 258 = is_rvalue_reference<T>::value; // C++17 259 template <class T> inline constexpr bool is_member_object_pointer_v 260 = is_member_object_pointer<T>::value; // C++17 261 template <class T> inline constexpr bool is_member_function_pointer_v 262 = is_member_function_pointer<T>::value; // C++17 263 template <class T> inline constexpr bool is_enum_v 264 = is_enum<T>::value; // C++17 265 template <class T> inline constexpr bool is_union_v 266 = is_union<T>::value; // C++17 267 template <class T> inline constexpr bool is_class_v 268 = is_class<T>::value; // C++17 269 template <class T> inline constexpr bool is_function_v 270 = is_function<T>::value; // C++17 271 272 // See C++14 20.10.4.2, composite type categories 273 template <class T> inline constexpr bool is_reference_v 274 = is_reference<T>::value; // C++17 275 template <class T> inline constexpr bool is_arithmetic_v 276 = is_arithmetic<T>::value; // C++17 277 template <class T> inline constexpr bool is_fundamental_v 278 = is_fundamental<T>::value; // C++17 279 template <class T> inline constexpr bool is_object_v 280 = is_object<T>::value; // C++17 281 template <class T> inline constexpr bool is_scalar_v 282 = is_scalar<T>::value; // C++17 283 template <class T> inline constexpr bool is_compound_v 284 = is_compound<T>::value; // C++17 285 template <class T> inline constexpr bool is_member_pointer_v 286 = is_member_pointer<T>::value; // C++17 287 288 // See C++14 20.10.4.3, type properties 289 template <class T> inline constexpr bool is_const_v 290 = is_const<T>::value; // C++17 291 template <class T> inline constexpr bool is_volatile_v 292 = is_volatile<T>::value; // C++17 293 template <class T> inline constexpr bool is_trivial_v 294 = is_trivial<T>::value; // C++17 295 template <class T> inline constexpr bool is_trivially_copyable_v 296 = is_trivially_copyable<T>::value; // C++17 297 template <class T> inline constexpr bool is_standard_layout_v 298 = is_standard_layout<T>::value; // C++17 299 template <class T> inline constexpr bool is_pod_v 300 = is_pod<T>::value; // C++17 301 template <class T> inline constexpr bool is_literal_type_v 302 = is_literal_type<T>::value; // C++17 303 template <class T> inline constexpr bool is_empty_v 304 = is_empty<T>::value; // C++17 305 template <class T> inline constexpr bool is_polymorphic_v 306 = is_polymorphic<T>::value; // C++17 307 template <class T> inline constexpr bool is_abstract_v 308 = is_abstract<T>::value; // C++17 309 template <class T> inline constexpr bool is_final_v 310 = is_final<T>::value; // C++17 311 template <class T> inline constexpr bool is_aggregate_v 312 = is_aggregate<T>::value; // C++17 313 template <class T> inline constexpr bool is_signed_v 314 = is_signed<T>::value; // C++17 315 template <class T> inline constexpr bool is_unsigned_v 316 = is_unsigned<T>::value; // C++17 317 template <class T, class... Args> inline constexpr bool is_constructible_v 318 = is_constructible<T, Args...>::value; // C++17 319 template <class T> inline constexpr bool is_default_constructible_v 320 = is_default_constructible<T>::value; // C++17 321 template <class T> inline constexpr bool is_copy_constructible_v 322 = is_copy_constructible<T>::value; // C++17 323 template <class T> inline constexpr bool is_move_constructible_v 324 = is_move_constructible<T>::value; // C++17 325 template <class T, class U> inline constexpr bool is_assignable_v 326 = is_assignable<T, U>::value; // C++17 327 template <class T> inline constexpr bool is_copy_assignable_v 328 = is_copy_assignable<T>::value; // C++17 329 template <class T> inline constexpr bool is_move_assignable_v 330 = is_move_assignable<T>::value; // C++17 331 template <class T, class U> inline constexpr bool is_swappable_with_v 332 = is_swappable_with<T, U>::value; // C++17 333 template <class T> inline constexpr bool is_swappable_v 334 = is_swappable<T>::value; // C++17 335 template <class T> inline constexpr bool is_destructible_v 336 = is_destructible<T>::value; // C++17 337 template <class T, class... Args> inline constexpr bool is_trivially_constructible_v 338 = is_trivially_constructible<T, Args...>::value; // C++17 339 template <class T> inline constexpr bool is_trivially_default_constructible_v 340 = is_trivially_default_constructible<T>::value; // C++17 341 template <class T> inline constexpr bool is_trivially_copy_constructible_v 342 = is_trivially_copy_constructible<T>::value; // C++17 343 template <class T> inline constexpr bool is_trivially_move_constructible_v 344 = is_trivially_move_constructible<T>::value; // C++17 345 template <class T, class U> inline constexpr bool is_trivially_assignable_v 346 = is_trivially_assignable<T, U>::value; // C++17 347 template <class T> inline constexpr bool is_trivially_copy_assignable_v 348 = is_trivially_copy_assignable<T>::value; // C++17 349 template <class T> inline constexpr bool is_trivially_move_assignable_v 350 = is_trivially_move_assignable<T>::value; // C++17 351 template <class T> inline constexpr bool is_trivially_destructible_v 352 = is_trivially_destructible<T>::value; // C++17 353 template <class T, class... Args> inline constexpr bool is_nothrow_constructible_v 354 = is_nothrow_constructible<T, Args...>::value; // C++17 355 template <class T> inline constexpr bool is_nothrow_default_constructible_v 356 = is_nothrow_default_constructible<T>::value; // C++17 357 template <class T> inline constexpr bool is_nothrow_copy_constructible_v 358 = is_nothrow_copy_constructible<T>::value; // C++17 359 template <class T> inline constexpr bool is_nothrow_move_constructible_v 360 = is_nothrow_move_constructible<T>::value; // C++17 361 template <class T, class U> inline constexpr bool is_nothrow_assignable_v 362 = is_nothrow_assignable<T, U>::value; // C++17 363 template <class T> inline constexpr bool is_nothrow_copy_assignable_v 364 = is_nothrow_copy_assignable<T>::value; // C++17 365 template <class T> inline constexpr bool is_nothrow_move_assignable_v 366 = is_nothrow_move_assignable<T>::value; // C++17 367 template <class T, class U> inline constexpr bool is_nothrow_swappable_with_v 368 = is_nothrow_swappable_with<T, U>::value; // C++17 369 template <class T> inline constexpr bool is_nothrow_swappable_v 370 = is_nothrow_swappable<T>::value; // C++17 371 template <class T> inline constexpr bool is_nothrow_destructible_v 372 = is_nothrow_destructible<T>::value; // C++17 373 template <class T> inline constexpr bool has_virtual_destructor_v 374 = has_virtual_destructor<T>::value; // C++17 375 template<class T> inline constexpr bool has_unique_object_representations_v // C++17 376 = has_unique_object_representations<T>::value; 377 378 // See C++14 20.10.5, type property queries 379 template <class T> inline constexpr size_t alignment_of_v 380 = alignment_of<T>::value; // C++17 381 template <class T> inline constexpr size_t rank_v 382 = rank<T>::value; // C++17 383 template <class T, unsigned I = 0> inline constexpr size_t extent_v 384 = extent<T, I>::value; // C++17 385 386 // See C++14 20.10.6, type relations 387 template <class T, class U> inline constexpr bool is_same_v 388 = is_same<T, U>::value; // C++17 389 template <class Base, class Derived> inline constexpr bool is_base_of_v 390 = is_base_of<Base, Derived>::value; // C++17 391 template <class From, class To> inline constexpr bool is_convertible_v 392 = is_convertible<From, To>::value; // C++17 393 template <class Fn, class... ArgTypes> inline constexpr bool is_invocable_v 394 = is_invocable<Fn, ArgTypes...>::value; // C++17 395 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_invocable_r_v 396 = is_invocable_r<R, Fn, ArgTypes...>::value; // C++17 397 template <class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_v 398 = is_nothrow_invocable<Fn, ArgTypes...>::value; // C++17 399 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_r_v 400 = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; // C++17 401 402 // [meta.logical], logical operator traits: 403 template<class... B> struct conjunction; // C++17 404 template<class... B> 405 inline constexpr bool conjunction_v = conjunction<B...>::value; // C++17 406 template<class... B> struct disjunction; // C++17 407 template<class... B> 408 inline constexpr bool disjunction_v = disjunction<B...>::value; // C++17 409 template<class B> struct negation; // C++17 410 template<class B> 411 inline constexpr bool negation_v = negation<B>::value; // C++17 412 413} 414 415*/ 416#include <__config> 417#include <cstddef> 418#include <version> 419 420#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 421#pragma GCC system_header 422#endif 423 424_LIBCPP_BEGIN_NAMESPACE_STD 425 426template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 427template <class _Tp> class _LIBCPP_TEMPLATE_VIS reference_wrapper; 428template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 429 430template <class _Tp, _Tp __v> 431struct _LIBCPP_TEMPLATE_VIS integral_constant 432{ 433 static _LIBCPP_CONSTEXPR const _Tp value = __v; 434 typedef _Tp value_type; 435 typedef integral_constant type; 436 _LIBCPP_INLINE_VISIBILITY 437 _LIBCPP_CONSTEXPR operator value_type() const _NOEXCEPT {return value;} 438#if _LIBCPP_STD_VER > 11 439 _LIBCPP_INLINE_VISIBILITY 440 constexpr value_type operator ()() const _NOEXCEPT {return value;} 441#endif 442}; 443 444template <class _Tp, _Tp __v> 445_LIBCPP_CONSTEXPR const _Tp integral_constant<_Tp, __v>::value; 446 447#if _LIBCPP_STD_VER > 14 448template <bool __b> 449using bool_constant = integral_constant<bool, __b>; 450#define _LIBCPP_BOOL_CONSTANT(__b) bool_constant<(__b)> 451#else 452#define _LIBCPP_BOOL_CONSTANT(__b) integral_constant<bool,(__b)> 453#endif 454 455typedef _LIBCPP_BOOL_CONSTANT(true) true_type; 456typedef _LIBCPP_BOOL_CONSTANT(false) false_type; 457 458template <bool _Val> 459using _BoolConstant _LIBCPP_NODEBUG_TYPE = integral_constant<bool, _Val>; 460 461template <bool> struct _MetaBase; 462template <> 463struct _MetaBase<true> { 464 template <class _Tp, class _Up> 465 using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Tp; 466 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 467 using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _FirstFn<_Args...>; 468 template <class _First, class...> 469 using _FirstImpl _LIBCPP_NODEBUG_TYPE = _First; 470 template <class, class _Second, class...> 471 using _SecondImpl _LIBCPP_NODEBUG_TYPE = _Second; 472 template <class _Tp = void> 473 using _EnableIfImpl _LIBCPP_NODEBUG_TYPE = _Tp; 474 template <class _Result, class _First, class ..._Rest> 475 using _OrImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 476 template <class _Result, class _First, class ..._Rest> 477 using _AndImpl _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_First::value == true && sizeof...(_Rest) != 0>::template _AndImpl<_First, _Rest...>; 478}; 479 480template <> 481struct _MetaBase<false> { 482 template <class _Tp, class _Up> 483 using _SelectImpl _LIBCPP_NODEBUG_TYPE = _Up; 484 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 485 using _SelectApplyImpl _LIBCPP_NODEBUG_TYPE = _SecondFn<_Args...>; 486 template <class _Result, class ...> 487 using _OrImpl _LIBCPP_NODEBUG_TYPE = _Result; 488 template <class _Result, class ...> 489 using _AndImpl _LIBCPP_NODEBUG_TYPE = _Result; 490}; 491template <bool _Cond, class _Ret = void> 492using _EnableIf _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _EnableIfImpl<_Ret>; 493template <bool _Cond, class _IfRes, class _ElseRes> 494using _If _LIBCPP_NODEBUG_TYPE = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 495template <class ..._Rest> 496using _Or _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 497template <class ..._Rest> 498using _And _LIBCPP_NODEBUG_TYPE = typename _MetaBase< sizeof...(_Rest) != 0 >::template _AndImpl<true_type, _Rest...>; 499template <class _Pred> 500struct _Not : _BoolConstant<!_Pred::value> {}; 501template <class ..._Args> 502using _FirstType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 503template <class ..._Args> 504using _SecondType _LIBCPP_NODEBUG_TYPE = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 505 506template <template <class...> class _Func, class ..._Args> 507struct _Lazy : _Func<_Args...> {}; 508 509// Member detector base 510 511template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 512true_type __sfinae_test_impl(int); 513template <template <class...> class, class ...> 514false_type __sfinae_test_impl(...); 515 516template <template <class ...> class _Templ, class ..._Args> 517using _IsValidExpansion _LIBCPP_NODEBUG_TYPE = decltype(std::__sfinae_test_impl<_Templ, _Args...>(0)); 518 519template <class> 520struct __void_t { typedef void type; }; 521 522template <class _Tp> 523struct __identity { typedef _Tp type; }; 524 525template <class _Tp, bool> 526struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 527 528 529template <bool _Bp, class _If, class _Then> 530 struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;}; 531template <class _If, class _Then> 532 struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;}; 533 534#if _LIBCPP_STD_VER > 11 535template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type; 536#endif 537 538template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {}; 539template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;}; 540 541#if _LIBCPP_STD_VER > 11 542template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; 543#endif 544 545// is_same 546 547template <class _Tp, class _Up> struct _LIBCPP_TEMPLATE_VIS is_same : public false_type {}; 548template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_same<_Tp, _Tp> : public true_type {}; 549 550#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 551template <class _Tp, class _Up> 552_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_same_v 553 = is_same<_Tp, _Up>::value; 554#endif 555 556template <class _Tp, class _Up> 557using _IsSame = _BoolConstant< 558#ifdef __clang__ 559 __is_same(_Tp, _Up) 560#else 561 _VSTD::is_same<_Tp, _Up>::value 562#endif 563>; 564 565template <class _Tp, class _Up> 566using _IsNotSame = _BoolConstant< 567#ifdef __clang__ 568 !__is_same(_Tp, _Up) 569#else 570 !_VSTD::is_same<_Tp, _Up>::value 571#endif 572>; 573 574 575template <class _Tp> 576using __test_for_primary_template = _EnableIf< 577 _IsSame<_Tp, typename _Tp::__primary_template>::value 578 >; 579template <class _Tp> 580using __is_primary_template = _IsValidExpansion< 581 __test_for_primary_template, _Tp 582 >; 583 584// addressof 585#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF 586 587template <class _Tp> 588inline _LIBCPP_CONSTEXPR_AFTER_CXX14 589_LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY 590_Tp* 591addressof(_Tp& __x) _NOEXCEPT 592{ 593 return __builtin_addressof(__x); 594} 595 596#else 597 598template <class _Tp> 599inline _LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY 600_Tp* 601addressof(_Tp& __x) _NOEXCEPT 602{ 603 return reinterpret_cast<_Tp *>( 604 const_cast<char *>(&reinterpret_cast<const volatile char &>(__x))); 605} 606 607#endif // _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF 608 609#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF) 610// Objective-C++ Automatic Reference Counting uses qualified pointers 611// that require special addressof() signatures. When 612// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler 613// itself is providing these definitions. Otherwise, we provide them. 614template <class _Tp> 615inline _LIBCPP_INLINE_VISIBILITY 616__strong _Tp* 617addressof(__strong _Tp& __x) _NOEXCEPT 618{ 619 return &__x; 620} 621 622#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK 623template <class _Tp> 624inline _LIBCPP_INLINE_VISIBILITY 625__weak _Tp* 626addressof(__weak _Tp& __x) _NOEXCEPT 627{ 628 return &__x; 629} 630#endif 631 632template <class _Tp> 633inline _LIBCPP_INLINE_VISIBILITY 634__autoreleasing _Tp* 635addressof(__autoreleasing _Tp& __x) _NOEXCEPT 636{ 637 return &__x; 638} 639 640template <class _Tp> 641inline _LIBCPP_INLINE_VISIBILITY 642__unsafe_unretained _Tp* 643addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT 644{ 645 return &__x; 646} 647#endif 648 649#if !defined(_LIBCPP_CXX03_LANG) 650template <class _Tp> _Tp* addressof(const _Tp&&) noexcept = delete; 651#endif 652 653struct __two {char __lx[2];}; 654 655// helper class: 656 657// is_const 658 659template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 660template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 661 662#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 663template <class _Tp> 664_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_const_v 665 = is_const<_Tp>::value; 666#endif 667 668// is_volatile 669 670template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {}; 671template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {}; 672 673#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 674template <class _Tp> 675_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_volatile_v 676 = is_volatile<_Tp>::value; 677#endif 678 679// remove_const 680 681template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const {typedef _Tp type;}; 682template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;}; 683#if _LIBCPP_STD_VER > 11 684template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type; 685#endif 686 687// remove_volatile 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// remove_cv 696 697template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv 698{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 699#if _LIBCPP_STD_VER > 11 700template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type; 701#endif 702 703// is_void 704 705template <class _Tp> struct __libcpp_is_void : public false_type {}; 706template <> struct __libcpp_is_void<void> : public true_type {}; 707 708template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void 709 : public __libcpp_is_void<typename remove_cv<_Tp>::type> {}; 710 711#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 712template <class _Tp> 713_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_void_v 714 = is_void<_Tp>::value; 715#endif 716 717// __is_nullptr_t 718 719template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 720template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 721 722template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 723 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 724 725#if _LIBCPP_STD_VER > 11 726template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 727 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 728 729#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 730template <class _Tp> 731_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_null_pointer_v 732 = is_null_pointer<_Tp>::value; 733#endif 734#endif // _LIBCPP_STD_VER > 11 735 736// is_integral 737 738template <class _Tp> struct __libcpp_is_integral : public false_type {}; 739template <> struct __libcpp_is_integral<bool> : public true_type {}; 740template <> struct __libcpp_is_integral<char> : public true_type {}; 741template <> struct __libcpp_is_integral<signed char> : public true_type {}; 742template <> struct __libcpp_is_integral<unsigned char> : public true_type {}; 743template <> struct __libcpp_is_integral<wchar_t> : public true_type {}; 744#ifndef _LIBCPP_NO_HAS_CHAR8_T 745template <> struct __libcpp_is_integral<char8_t> : public true_type {}; 746#endif 747#ifndef _LIBCPP_HAS_NO_UNICODE_CHARS 748template <> struct __libcpp_is_integral<char16_t> : public true_type {}; 749template <> struct __libcpp_is_integral<char32_t> : public true_type {}; 750#endif // _LIBCPP_HAS_NO_UNICODE_CHARS 751template <> struct __libcpp_is_integral<short> : public true_type {}; 752template <> struct __libcpp_is_integral<unsigned short> : public true_type {}; 753template <> struct __libcpp_is_integral<int> : public true_type {}; 754template <> struct __libcpp_is_integral<unsigned int> : public true_type {}; 755template <> struct __libcpp_is_integral<long> : public true_type {}; 756template <> struct __libcpp_is_integral<unsigned long> : public true_type {}; 757template <> struct __libcpp_is_integral<long long> : public true_type {}; 758template <> struct __libcpp_is_integral<unsigned long long> : public true_type {}; 759#ifndef _LIBCPP_HAS_NO_INT128 760template <> struct __libcpp_is_integral<__int128_t> : public true_type {}; 761template <> struct __libcpp_is_integral<__uint128_t> : public true_type {}; 762#endif 763 764template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral 765 : public __libcpp_is_integral<typename remove_cv<_Tp>::type> {}; 766 767#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 768template <class _Tp> 769_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_integral_v 770 = is_integral<_Tp>::value; 771#endif 772 773// is_floating_point 774 775template <class _Tp> struct __libcpp_is_floating_point : public false_type {}; 776template <> struct __libcpp_is_floating_point<float> : public true_type {}; 777template <> struct __libcpp_is_floating_point<double> : public true_type {}; 778template <> struct __libcpp_is_floating_point<long double> : public true_type {}; 779 780template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point 781 : public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {}; 782 783#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 784template <class _Tp> 785_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_floating_point_v 786 = is_floating_point<_Tp>::value; 787#endif 788 789// is_array 790 791template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array 792 : public false_type {}; 793template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]> 794 : public true_type {}; 795template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]> 796 : public true_type {}; 797 798#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 799template <class _Tp> 800_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_array_v 801 = is_array<_Tp>::value; 802#endif 803 804// is_pointer 805 806template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 807template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 808 809template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 810#if defined(_LIBCPP_HAS_OBJC_ARC) 811template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 812template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 813template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 814template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 815#endif 816 817template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 818 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 819 820#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 821template <class _Tp> 822_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pointer_v 823 = is_pointer<_Tp>::value; 824#endif 825 826// is_reference 827 828template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 829template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 830 831template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 832template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 833 834template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 835template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 836template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {}; 837 838#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 839template <class _Tp> 840_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_reference_v 841 = is_reference<_Tp>::value; 842 843template <class _Tp> 844_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_lvalue_reference_v 845 = is_lvalue_reference<_Tp>::value; 846 847template <class _Tp> 848_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_rvalue_reference_v 849 = is_rvalue_reference<_Tp>::value; 850#endif 851// is_union 852 853#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 854 855template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 856 : public integral_constant<bool, __is_union(_Tp)> {}; 857 858#else 859 860template <class _Tp> struct __libcpp_union : public false_type {}; 861template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 862 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 863 864#endif 865 866#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 867template <class _Tp> 868_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_union_v 869 = is_union<_Tp>::value; 870#endif 871 872// is_class 873 874#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 875 876template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 877 : public integral_constant<bool, __is_class(_Tp)> {}; 878 879#else 880 881namespace __is_class_imp 882{ 883template <class _Tp> char __test(int _Tp::*); 884template <class _Tp> __two __test(...); 885} 886 887template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 888 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 889 890#endif 891 892#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 893template <class _Tp> 894_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_class_v 895 = is_class<_Tp>::value; 896#endif 897 898// is_function 899 900template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 901 : public _BoolConstant< 902#ifdef __clang__ 903 __is_function(_Tp) 904#else 905 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 906#endif 907 > {}; 908 909 910#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 911template <class _Tp> 912_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_function_v 913 = is_function<_Tp>::value; 914#endif 915 916template <class _Tp> struct __libcpp_is_member_pointer { 917 enum { 918 __is_member = false, 919 __is_func = false, 920 __is_obj = false 921 }; 922}; 923template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 924 enum { 925 __is_member = true, 926 __is_func = is_function<_Tp>::value, 927 __is_obj = !__is_func, 928 }; 929}; 930 931 932template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 933 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 934 935#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 936template <class _Tp> 937_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_function_pointer_v 938 = is_member_function_pointer<_Tp>::value; 939#endif 940 941// is_member_pointer 942 943template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 944 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 945 946#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 947template <class _Tp> 948_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_pointer_v 949 = is_member_pointer<_Tp>::value; 950#endif 951 952// is_member_object_pointer 953 954template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 955 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 956 957#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 958template <class _Tp> 959_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_member_object_pointer_v 960 = is_member_object_pointer<_Tp>::value; 961#endif 962 963// is_enum 964 965#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 966 967template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 968 : public integral_constant<bool, __is_enum(_Tp)> {}; 969 970#else 971 972template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 973 : public integral_constant<bool, !is_void<_Tp>::value && 974 !is_integral<_Tp>::value && 975 !is_floating_point<_Tp>::value && 976 !is_array<_Tp>::value && 977 !is_pointer<_Tp>::value && 978 !is_reference<_Tp>::value && 979 !is_member_pointer<_Tp>::value && 980 !is_union<_Tp>::value && 981 !is_class<_Tp>::value && 982 !is_function<_Tp>::value > {}; 983 984#endif 985 986#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 987template <class _Tp> 988_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_enum_v 989 = is_enum<_Tp>::value; 990#endif 991 992// is_arithmetic 993 994template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 995 : public integral_constant<bool, is_integral<_Tp>::value || 996 is_floating_point<_Tp>::value> {}; 997 998#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 999template <class _Tp> 1000_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_arithmetic_v 1001 = is_arithmetic<_Tp>::value; 1002#endif 1003 1004// is_fundamental 1005 1006template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 1007 : public integral_constant<bool, is_void<_Tp>::value || 1008 __is_nullptr_t<_Tp>::value || 1009 is_arithmetic<_Tp>::value> {}; 1010 1011#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1012template <class _Tp> 1013_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_fundamental_v 1014 = is_fundamental<_Tp>::value; 1015#endif 1016 1017// is_scalar 1018 1019template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1020 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1021 is_member_pointer<_Tp>::value || 1022 is_pointer<_Tp>::value || 1023 __is_nullptr_t<_Tp>::value || 1024 is_enum<_Tp>::value > {}; 1025 1026template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1027 1028#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1029template <class _Tp> 1030_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_scalar_v 1031 = is_scalar<_Tp>::value; 1032#endif 1033 1034// is_object 1035 1036template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1037 : public integral_constant<bool, is_scalar<_Tp>::value || 1038 is_array<_Tp>::value || 1039 is_union<_Tp>::value || 1040 is_class<_Tp>::value > {}; 1041 1042#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1043template <class _Tp> 1044_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_object_v 1045 = is_object<_Tp>::value; 1046#endif 1047 1048// is_compound 1049 1050template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1051 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1052 1053#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1054template <class _Tp> 1055_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_compound_v 1056 = is_compound<_Tp>::value; 1057#endif 1058 1059 1060// __is_referenceable [defns.referenceable] 1061 1062struct __is_referenceable_impl { 1063 template <class _Tp> static _Tp& __test(int); 1064 template <class _Tp> static __two __test(...); 1065}; 1066 1067template <class _Tp> 1068struct __is_referenceable : integral_constant<bool, 1069 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1070 1071 1072// add_const 1073 1074template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1075 typedef _LIBCPP_NODEBUG_TYPE const _Tp type; 1076}; 1077 1078#if _LIBCPP_STD_VER > 11 1079template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1080#endif 1081 1082// add_volatile 1083 1084template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1085 typedef _LIBCPP_NODEBUG_TYPE volatile _Tp type; 1086}; 1087 1088#if _LIBCPP_STD_VER > 11 1089template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1090#endif 1091 1092// add_cv 1093template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1094 typedef _LIBCPP_NODEBUG_TYPE const volatile _Tp type; 1095}; 1096 1097#if _LIBCPP_STD_VER > 11 1098template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1099#endif 1100 1101// remove_reference 1102 1103template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1104template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1105template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1106 1107#if _LIBCPP_STD_VER > 11 1108template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1109#endif 1110 1111// add_lvalue_reference 1112 1113template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1114template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp& type; }; 1115 1116template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1117{typedef _LIBCPP_NODEBUG_TYPE typename __add_lvalue_reference_impl<_Tp>::type type;}; 1118 1119#if _LIBCPP_STD_VER > 11 1120template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1121#endif 1122 1123template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 1124template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG_TYPE _Tp&& type; }; 1125 1126template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1127{typedef _LIBCPP_NODEBUG_TYPE typename __add_rvalue_reference_impl<_Tp>::type type;}; 1128 1129#if _LIBCPP_STD_VER > 11 1130template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1131#endif 1132 1133// Suppress deprecation notice for volatile-qualified return type resulting 1134// from volatile-qualified types _Tp. 1135_LIBCPP_SUPPRESS_DEPRECATED_PUSH 1136template <class _Tp> _Tp&& __declval(int); 1137template <class _Tp> _Tp __declval(long); 1138_LIBCPP_SUPPRESS_DEPRECATED_POP 1139 1140template <class _Tp> 1141decltype(_VSTD::__declval<_Tp>(0)) 1142declval() _NOEXCEPT; 1143 1144// __uncvref 1145 1146template <class _Tp> 1147struct __uncvref { 1148 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<typename remove_reference<_Tp>::type>::type type; 1149}; 1150 1151template <class _Tp> 1152struct __unconstref { 1153 typedef _LIBCPP_NODEBUG_TYPE typename remove_const<typename remove_reference<_Tp>::type>::type type; 1154}; 1155 1156#ifndef _LIBCPP_CXX03_LANG 1157template <class _Tp> 1158using __uncvref_t _LIBCPP_NODEBUG_TYPE = typename __uncvref<_Tp>::type; 1159#endif 1160 1161// __is_same_uncvref 1162 1163template <class _Tp, class _Up> 1164struct __is_same_uncvref : _IsSame<typename __uncvref<_Tp>::type, 1165 typename __uncvref<_Up>::type> {}; 1166 1167#if _LIBCPP_STD_VER > 17 1168// remove_cvref - same as __uncvref 1169template <class _Tp> 1170struct remove_cvref : public __uncvref<_Tp> {}; 1171 1172template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1173#endif 1174 1175 1176struct __any 1177{ 1178 __any(...); 1179}; 1180 1181// remove_pointer 1182 1183template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1184template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1185template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1186template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1187template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1188 1189#if _LIBCPP_STD_VER > 11 1190template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1191#endif 1192 1193// add_pointer 1194 1195template <class _Tp, 1196 bool = __is_referenceable<_Tp>::value || 1197 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1198struct __add_pointer_impl 1199 {typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type* type;}; 1200template <class _Tp> struct __add_pointer_impl<_Tp, false> 1201 {typedef _LIBCPP_NODEBUG_TYPE _Tp type;}; 1202 1203template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1204 {typedef _LIBCPP_NODEBUG_TYPE typename __add_pointer_impl<_Tp>::type type;}; 1205 1206#if _LIBCPP_STD_VER > 11 1207template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1208#endif 1209 1210// type_identity 1211#if _LIBCPP_STD_VER > 17 1212template<class _Tp> struct type_identity { typedef _Tp type; }; 1213template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1214#endif 1215 1216// is_signed 1217 1218template <class _Tp, bool = is_integral<_Tp>::value> 1219struct __libcpp_is_signed_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(-1) < _Tp(0)) {}; 1220 1221template <class _Tp> 1222struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1223 1224template <class _Tp, bool = is_arithmetic<_Tp>::value> 1225struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1226 1227template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1228 1229template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1230 1231#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1232template <class _Tp> 1233_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_signed_v 1234 = is_signed<_Tp>::value; 1235#endif 1236 1237// is_unsigned 1238 1239template <class _Tp, bool = is_integral<_Tp>::value> 1240struct __libcpp_is_unsigned_impl : public _LIBCPP_BOOL_CONSTANT(_Tp(0) < _Tp(-1)) {}; 1241 1242template <class _Tp> 1243struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1244 1245template <class _Tp, bool = is_arithmetic<_Tp>::value> 1246struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1247 1248template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1249 1250template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {}; 1251 1252#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1253template <class _Tp> 1254_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_unsigned_v 1255 = is_unsigned<_Tp>::value; 1256#endif 1257 1258// rank 1259 1260template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1261 : public integral_constant<size_t, 0> {}; 1262template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1263 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1264template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1265 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1266 1267#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1268template <class _Tp> 1269_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t rank_v 1270 = rank<_Tp>::value; 1271#endif 1272 1273// extent 1274 1275template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1276 : public integral_constant<size_t, 0> {}; 1277template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1278 : public integral_constant<size_t, 0> {}; 1279template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1280 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1281template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1282 : public integral_constant<size_t, _Np> {}; 1283template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1284 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1285 1286#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1287template <class _Tp, unsigned _Ip = 0> 1288_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t extent_v 1289 = extent<_Tp, _Ip>::value; 1290#endif 1291 1292// remove_extent 1293 1294template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1295 {typedef _Tp type;}; 1296template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1297 {typedef _Tp type;}; 1298template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1299 {typedef _Tp type;}; 1300 1301#if _LIBCPP_STD_VER > 11 1302template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1303#endif 1304 1305// remove_all_extents 1306 1307template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1308 {typedef _Tp type;}; 1309template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1310 {typedef typename remove_all_extents<_Tp>::type type;}; 1311template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1312 {typedef typename remove_all_extents<_Tp>::type type;}; 1313 1314#if _LIBCPP_STD_VER > 11 1315template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1316#endif 1317 1318#if _LIBCPP_STD_VER > 17 1319// is_bounded_array 1320 1321template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1322template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1323 1324template <class _Tp> 1325_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1326bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1327 1328// is_unbounded_array 1329 1330template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1331template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1332 1333template <class _Tp> 1334_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR 1335bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1336#endif 1337 1338// decay 1339 1340template <class _Up, bool> 1341struct __decay { 1342 typedef _LIBCPP_NODEBUG_TYPE typename remove_cv<_Up>::type type; 1343}; 1344 1345template <class _Up> 1346struct __decay<_Up, true> { 1347public: 1348 typedef _LIBCPP_NODEBUG_TYPE typename conditional 1349 < 1350 is_array<_Up>::value, 1351 typename remove_extent<_Up>::type*, 1352 typename conditional 1353 < 1354 is_function<_Up>::value, 1355 typename add_pointer<_Up>::type, 1356 typename remove_cv<_Up>::type 1357 >::type 1358 >::type type; 1359}; 1360 1361template <class _Tp> 1362struct _LIBCPP_TEMPLATE_VIS decay 1363{ 1364private: 1365 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 1366public: 1367 typedef _LIBCPP_NODEBUG_TYPE typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1368}; 1369 1370#if _LIBCPP_STD_VER > 11 1371template <class _Tp> using decay_t = typename decay<_Tp>::type; 1372#endif 1373 1374// is_abstract 1375 1376template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1377 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1378 1379#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1380template <class _Tp> 1381_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_abstract_v 1382 = is_abstract<_Tp>::value; 1383#endif 1384 1385// is_final 1386 1387template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1388__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1389 1390#if _LIBCPP_STD_VER > 11 1391template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1392is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1393#endif 1394 1395#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1396template <class _Tp> 1397_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_final_v 1398 = is_final<_Tp>::value; 1399#endif 1400 1401// is_aggregate 1402#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1403 1404template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1405is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1406 1407#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1408template <class _Tp> 1409_LIBCPP_INLINE_VAR constexpr bool is_aggregate_v 1410 = is_aggregate<_Tp>::value; 1411#endif 1412 1413#endif // _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_IS_AGGREGATE) 1414 1415// is_base_of 1416 1417template <class _Bp, class _Dp> 1418struct _LIBCPP_TEMPLATE_VIS is_base_of 1419 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1420 1421#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1422template <class _Bp, class _Dp> 1423_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_base_of_v 1424 = is_base_of<_Bp, _Dp>::value; 1425#endif 1426 1427// is_convertible 1428 1429#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1430 1431template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1432 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 1433 1434#else // __has_feature(is_convertible_to) 1435 1436namespace __is_convertible_imp 1437{ 1438template <class _Tp> void __test_convert(_Tp); 1439 1440template <class _From, class _To, class = void> 1441struct __is_convertible_test : public false_type {}; 1442 1443template <class _From, class _To> 1444struct __is_convertible_test<_From, _To, 1445 decltype(_VSTD::__is_convertible_imp::__test_convert<_To>(_VSTD::declval<_From>()))> : public true_type 1446{}; 1447 1448template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1449 bool _IsFunction = is_function<_Tp>::value, 1450 bool _IsVoid = is_void<_Tp>::value> 1451 struct __is_array_function_or_void {enum {value = 0};}; 1452template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1453template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1454template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1455} 1456 1457template <class _Tp, 1458 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1459struct __is_convertible_check 1460{ 1461 static const size_t __v = 0; 1462}; 1463 1464template <class _Tp> 1465struct __is_convertible_check<_Tp, 0> 1466{ 1467 static const size_t __v = sizeof(_Tp); 1468}; 1469 1470template <class _T1, class _T2, 1471 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1472 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1473struct __is_convertible 1474 : public integral_constant<bool, 1475 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1476 > 1477{}; 1478 1479template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1480template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1481template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1482template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1483 1484template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1485template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1486template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1487template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1488 1489template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1490template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1491template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1492template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1493 1494template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1495 : public __is_convertible<_T1, _T2> 1496{ 1497 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1498 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1499}; 1500 1501#endif // __has_feature(is_convertible_to) 1502 1503#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1504template <class _From, class _To> 1505_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_convertible_v 1506 = is_convertible<_From, _To>::value; 1507#endif 1508 1509// is_nothrow_convertible 1510 1511#if _LIBCPP_STD_VER > 17 1512 1513template <typename _Tp> 1514static void __test_noexcept(_Tp) noexcept; 1515 1516template<typename _Fm, typename _To> 1517static bool_constant<noexcept(__test_noexcept<_To>(declval<_Fm>()))> 1518__is_nothrow_convertible_test(); 1519 1520template <typename _Fm, typename _To> 1521struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1522{ }; 1523 1524template <typename _Fm, typename _To> 1525struct is_nothrow_convertible : _Or< 1526 _And<is_void<_To>, is_void<_Fm>>, 1527 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1528>::type { }; 1529 1530template <typename _Fm, typename _To> 1531inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1532 1533#endif // _LIBCPP_STD_VER > 17 1534 1535// is_empty 1536 1537#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1538 1539template <class _Tp> 1540struct _LIBCPP_TEMPLATE_VIS is_empty 1541 : public integral_constant<bool, __is_empty(_Tp)> {}; 1542 1543#else // __has_feature(is_empty) 1544 1545template <class _Tp> 1546struct __is_empty1 1547 : public _Tp 1548{ 1549 double __lx; 1550}; 1551 1552struct __is_empty2 1553{ 1554 double __lx; 1555}; 1556 1557template <class _Tp, bool = is_class<_Tp>::value> 1558struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1559 1560template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1561 1562template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1563 1564#endif // __has_feature(is_empty) 1565 1566#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1567template <class _Tp> 1568_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_empty_v 1569 = is_empty<_Tp>::value; 1570#endif 1571 1572// is_polymorphic 1573 1574#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1575 1576template <class _Tp> 1577struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1578 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1579 1580#else 1581 1582template<typename _Tp> char &__is_polymorphic_impl( 1583 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1584 int>::type); 1585template<typename _Tp> __two &__is_polymorphic_impl(...); 1586 1587template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1588 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1589 1590#endif // __has_feature(is_polymorphic) 1591 1592#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1593template <class _Tp> 1594_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_polymorphic_v 1595 = is_polymorphic<_Tp>::value; 1596#endif 1597 1598// has_virtual_destructor 1599 1600#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1601 1602template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1603 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1604 1605#else 1606 1607template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1608 : public false_type {}; 1609 1610#endif 1611 1612#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1613template <class _Tp> 1614_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_virtual_destructor_v 1615 = has_virtual_destructor<_Tp>::value; 1616#endif 1617 1618// has_unique_object_representations 1619 1620#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS) 1621 1622template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1623 : public integral_constant<bool, 1624 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1625 1626#if !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1627template <class _Tp> 1628_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool has_unique_object_representations_v 1629 = has_unique_object_representations<_Tp>::value; 1630#endif 1631 1632#endif 1633 1634// alignment_of 1635 1636template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1637 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1638 1639#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 1640template <class _Tp> 1641_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR size_t alignment_of_v 1642 = alignment_of<_Tp>::value; 1643#endif 1644 1645// aligned_storage 1646 1647template <class _Hp, class _Tp> 1648struct __type_list 1649{ 1650 typedef _Hp _Head; 1651 typedef _Tp _Tail; 1652}; 1653 1654struct __nat 1655{ 1656#ifndef _LIBCPP_CXX03_LANG 1657 __nat() = delete; 1658 __nat(const __nat&) = delete; 1659 __nat& operator=(const __nat&) = delete; 1660 ~__nat() = delete; 1661#endif 1662}; 1663 1664template <class _Tp> 1665struct __align_type 1666{ 1667 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1668 typedef _Tp type; 1669}; 1670 1671struct __struct_double {long double __lx;}; 1672struct __struct_double4 {double __lx[4];}; 1673 1674typedef 1675 __type_list<__align_type<unsigned char>, 1676 __type_list<__align_type<unsigned short>, 1677 __type_list<__align_type<unsigned int>, 1678 __type_list<__align_type<unsigned long>, 1679 __type_list<__align_type<unsigned long long>, 1680 __type_list<__align_type<double>, 1681 __type_list<__align_type<long double>, 1682 __type_list<__align_type<__struct_double>, 1683 __type_list<__align_type<__struct_double4>, 1684 __type_list<__align_type<int*>, 1685 __nat 1686 > > > > > > > > > > __all_types; 1687 1688template <size_t _Align> 1689struct _ALIGNAS(_Align) __fallback_overaligned {}; 1690 1691template <class _TL, size_t _Align> struct __find_pod; 1692 1693template <class _Hp, size_t _Align> 1694struct __find_pod<__type_list<_Hp, __nat>, _Align> 1695{ 1696 typedef typename conditional< 1697 _Align == _Hp::value, 1698 typename _Hp::type, 1699 __fallback_overaligned<_Align> 1700 >::type type; 1701}; 1702 1703template <class _Hp, class _Tp, size_t _Align> 1704struct __find_pod<__type_list<_Hp, _Tp>, _Align> 1705{ 1706 typedef typename conditional< 1707 _Align == _Hp::value, 1708 typename _Hp::type, 1709 typename __find_pod<_Tp, _Align>::type 1710 >::type type; 1711}; 1712 1713template <class _TL, size_t _Len> struct __find_max_align; 1714 1715template <class _Hp, size_t _Len> 1716struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 1717 1718template <size_t _Len, size_t _A1, size_t _A2> 1719struct __select_align 1720{ 1721private: 1722 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 1723 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 1724public: 1725 static const size_t value = _Len < __max ? __min : __max; 1726}; 1727 1728template <class _Hp, class _Tp, size_t _Len> 1729struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 1730 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 1731 1732template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1733struct _LIBCPP_TEMPLATE_VIS aligned_storage 1734{ 1735 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 1736 union type 1737 { 1738 _Aligner __align; 1739 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 1740 }; 1741}; 1742 1743#if _LIBCPP_STD_VER > 11 1744template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1745 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 1746#endif 1747 1748#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 1749template <size_t _Len>\ 1750struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 1751{\ 1752 struct _ALIGNAS(n) type\ 1753 {\ 1754 unsigned char __lx[(_Len + n - 1)/n * n];\ 1755 };\ 1756} 1757 1758_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 1759_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 1760_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 1761_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 1762_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 1763_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 1764_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 1765_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 1766_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 1767_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 1768_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 1769_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 1770_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 1771_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 1772// PE/COFF does not support alignment beyond 8192 (=0x2000) 1773#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1774_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 1775#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1776 1777#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 1778 1779 1780// aligned_union 1781 1782template <size_t _I0, size_t ..._In> 1783struct __static_max; 1784 1785template <size_t _I0> 1786struct __static_max<_I0> 1787{ 1788 static const size_t value = _I0; 1789}; 1790 1791template <size_t _I0, size_t _I1, size_t ..._In> 1792struct __static_max<_I0, _I1, _In...> 1793{ 1794 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 1795 __static_max<_I1, _In...>::value; 1796}; 1797 1798template <size_t _Len, class _Type0, class ..._Types> 1799struct aligned_union 1800{ 1801 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 1802 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 1803 static const size_t __len = __static_max<_Len, sizeof(_Type0), 1804 sizeof(_Types)...>::value; 1805 typedef typename aligned_storage<__len, alignment_value>::type type; 1806}; 1807 1808#if _LIBCPP_STD_VER > 11 1809template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 1810#endif 1811 1812template <class _Tp> 1813struct __numeric_type 1814{ 1815 static void __test(...); 1816 static float __test(float); 1817 static double __test(char); 1818 static double __test(int); 1819 static double __test(unsigned); 1820 static double __test(long); 1821 static double __test(unsigned long); 1822 static double __test(long long); 1823 static double __test(unsigned long long); 1824 static double __test(double); 1825 static long double __test(long double); 1826 1827 typedef decltype(__test(declval<_Tp>())) type; 1828 static const bool value = _IsNotSame<type, void>::value; 1829}; 1830 1831template <> 1832struct __numeric_type<void> 1833{ 1834 static const bool value = true; 1835}; 1836 1837// __promote 1838 1839template <class _A1, class _A2 = void, class _A3 = void, 1840 bool = __numeric_type<_A1>::value && 1841 __numeric_type<_A2>::value && 1842 __numeric_type<_A3>::value> 1843class __promote_imp 1844{ 1845public: 1846 static const bool value = false; 1847}; 1848 1849template <class _A1, class _A2, class _A3> 1850class __promote_imp<_A1, _A2, _A3, true> 1851{ 1852private: 1853 typedef typename __promote_imp<_A1>::type __type1; 1854 typedef typename __promote_imp<_A2>::type __type2; 1855 typedef typename __promote_imp<_A3>::type __type3; 1856public: 1857 typedef decltype(__type1() + __type2() + __type3()) type; 1858 static const bool value = true; 1859}; 1860 1861template <class _A1, class _A2> 1862class __promote_imp<_A1, _A2, void, true> 1863{ 1864private: 1865 typedef typename __promote_imp<_A1>::type __type1; 1866 typedef typename __promote_imp<_A2>::type __type2; 1867public: 1868 typedef decltype(__type1() + __type2()) type; 1869 static const bool value = true; 1870}; 1871 1872template <class _A1> 1873class __promote_imp<_A1, void, void, true> 1874{ 1875public: 1876 typedef typename __numeric_type<_A1>::type type; 1877 static const bool value = true; 1878}; 1879 1880template <class _A1, class _A2 = void, class _A3 = void> 1881class __promote : public __promote_imp<_A1, _A2, _A3> {}; 1882 1883// make_signed / make_unsigned 1884 1885typedef 1886 __type_list<signed char, 1887 __type_list<signed short, 1888 __type_list<signed int, 1889 __type_list<signed long, 1890 __type_list<signed long long, 1891#ifndef _LIBCPP_HAS_NO_INT128 1892 __type_list<__int128_t, 1893#endif 1894 __nat 1895#ifndef _LIBCPP_HAS_NO_INT128 1896 > 1897#endif 1898 > > > > > __signed_types; 1899 1900typedef 1901 __type_list<unsigned char, 1902 __type_list<unsigned short, 1903 __type_list<unsigned int, 1904 __type_list<unsigned long, 1905 __type_list<unsigned long long, 1906#ifndef _LIBCPP_HAS_NO_INT128 1907 __type_list<__uint128_t, 1908#endif 1909 __nat 1910#ifndef _LIBCPP_HAS_NO_INT128 1911 > 1912#endif 1913 > > > > > __unsigned_types; 1914 1915template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 1916 1917template <class _Hp, class _Tp, size_t _Size> 1918struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 1919{ 1920 typedef _LIBCPP_NODEBUG_TYPE _Hp type; 1921}; 1922 1923template <class _Hp, class _Tp, size_t _Size> 1924struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 1925{ 1926 typedef _LIBCPP_NODEBUG_TYPE typename __find_first<_Tp, _Size>::type type; 1927}; 1928 1929template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 1930 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 1931struct __apply_cv 1932{ 1933 typedef _LIBCPP_NODEBUG_TYPE _Up type; 1934}; 1935 1936template <class _Tp, class _Up> 1937struct __apply_cv<_Tp, _Up, true, false> 1938{ 1939 typedef _LIBCPP_NODEBUG_TYPE const _Up type; 1940}; 1941 1942template <class _Tp, class _Up> 1943struct __apply_cv<_Tp, _Up, false, true> 1944{ 1945 typedef volatile _Up type; 1946}; 1947 1948template <class _Tp, class _Up> 1949struct __apply_cv<_Tp, _Up, true, true> 1950{ 1951 typedef const volatile _Up type; 1952}; 1953 1954template <class _Tp, class _Up> 1955struct __apply_cv<_Tp&, _Up, false, false> 1956{ 1957 typedef _Up& type; 1958}; 1959 1960template <class _Tp, class _Up> 1961struct __apply_cv<_Tp&, _Up, true, false> 1962{ 1963 typedef const _Up& type; 1964}; 1965 1966template <class _Tp, class _Up> 1967struct __apply_cv<_Tp&, _Up, false, true> 1968{ 1969 typedef volatile _Up& type; 1970}; 1971 1972template <class _Tp, class _Up> 1973struct __apply_cv<_Tp&, _Up, true, true> 1974{ 1975 typedef const volatile _Up& type; 1976}; 1977 1978template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 1979struct __make_signed {}; 1980 1981template <class _Tp> 1982struct __make_signed<_Tp, true> 1983{ 1984 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 1985}; 1986 1987template <> struct __make_signed<bool, true> {}; 1988template <> struct __make_signed< signed short, true> {typedef short type;}; 1989template <> struct __make_signed<unsigned short, true> {typedef short type;}; 1990template <> struct __make_signed< signed int, true> {typedef int type;}; 1991template <> struct __make_signed<unsigned int, true> {typedef int type;}; 1992template <> struct __make_signed< signed long, true> {typedef long type;}; 1993template <> struct __make_signed<unsigned long, true> {typedef long type;}; 1994template <> struct __make_signed< signed long long, true> {typedef long long type;}; 1995template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 1996#ifndef _LIBCPP_HAS_NO_INT128 1997template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 1998template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 1999#endif 2000 2001template <class _Tp> 2002struct _LIBCPP_TEMPLATE_VIS make_signed 2003{ 2004 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 2005}; 2006 2007#if _LIBCPP_STD_VER > 11 2008template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 2009#endif 2010 2011template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2012struct __make_unsigned {}; 2013 2014template <class _Tp> 2015struct __make_unsigned<_Tp, true> 2016{ 2017 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2018}; 2019 2020template <> struct __make_unsigned<bool, true> {}; 2021template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2022template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2023template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2024template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2025template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2026template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2027template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2028template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2029#ifndef _LIBCPP_HAS_NO_INT128 2030template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2031template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2032#endif 2033 2034template <class _Tp> 2035struct _LIBCPP_TEMPLATE_VIS make_unsigned 2036{ 2037 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2038}; 2039 2040#if _LIBCPP_STD_VER > 11 2041template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2042#endif 2043 2044template <class _Tp, class _Up, class = void> 2045struct __common_type2_imp {}; 2046 2047template <class _Tp, class _Up> 2048struct __common_type2_imp<_Tp, _Up, 2049 typename __void_t<decltype( 2050 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2051 )>::type> 2052{ 2053 typedef _LIBCPP_NODEBUG_TYPE typename decay<decltype( 2054 true ? _VSTD::declval<_Tp>() : _VSTD::declval<_Up>() 2055 )>::type type; 2056}; 2057 2058template <class, class = void> 2059struct __common_type_impl {}; 2060 2061// Clang provides variadic templates in C++03 as an extension. 2062#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2063# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2064template <class... Tp> 2065struct __common_types; 2066template <class... _Tp> 2067struct _LIBCPP_TEMPLATE_VIS common_type; 2068#else 2069# define _LIBCPP_OPTIONAL_PACK(...) 2070struct __no_arg; 2071template <class _Tp, class _Up, class = __no_arg> 2072struct __common_types; 2073template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2074 class _Unused = __no_arg> 2075struct common_type { 2076 static_assert(sizeof(_Unused) == 0, 2077 "common_type accepts at most 3 arguments in C++03"); 2078}; 2079#endif // _LIBCPP_CXX03_LANG 2080 2081template <class _Tp, class _Up> 2082struct __common_type_impl< 2083 __common_types<_Tp, _Up>, 2084 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2085{ 2086 typedef typename common_type<_Tp, _Up>::type type; 2087}; 2088 2089template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2090struct __common_type_impl< 2091 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2092 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2093 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2094 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2095}; 2096 2097// bullet 1 - sizeof...(Tp) == 0 2098 2099template <> 2100struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2101 2102// bullet 2 - sizeof...(Tp) == 1 2103 2104template <class _Tp> 2105struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2106 : public common_type<_Tp, _Tp> {}; 2107 2108// bullet 3 - sizeof...(Tp) == 2 2109 2110template <class _Tp, class _Up> 2111struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2112 : conditional< 2113 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2114 __common_type2_imp<_Tp, _Up>, 2115 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2116 >::type 2117{}; 2118 2119// bullet 4 - sizeof...(Tp) > 2 2120 2121template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2122struct _LIBCPP_TEMPLATE_VIS 2123 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2124 : __common_type_impl< 2125 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2126 2127#undef _LIBCPP_OPTIONAL_PACK 2128 2129#if _LIBCPP_STD_VER > 11 2130template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2131#endif 2132 2133// is_assignable 2134 2135template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG_TYPE _Tp type; }; 2136 2137template <class _Tp, class _Arg> 2138typename __select_2nd<decltype((_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>())), true_type>::type 2139__is_assignable_test(int); 2140 2141template <class, class> 2142false_type __is_assignable_test(...); 2143 2144 2145template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2146struct __is_assignable_imp 2147 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2148 2149template <class _Tp, class _Arg> 2150struct __is_assignable_imp<_Tp, _Arg, true> 2151 : public false_type 2152{ 2153}; 2154 2155template <class _Tp, class _Arg> 2156struct is_assignable 2157 : public __is_assignable_imp<_Tp, _Arg> {}; 2158 2159#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2160template <class _Tp, class _Arg> 2161_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_assignable_v 2162 = is_assignable<_Tp, _Arg>::value; 2163#endif 2164 2165// is_copy_assignable 2166 2167template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2168 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2169 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2170 2171#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2172template <class _Tp> 2173_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_assignable_v 2174 = is_copy_assignable<_Tp>::value; 2175#endif 2176 2177// is_move_assignable 2178 2179template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2180 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2181 typename add_rvalue_reference<_Tp>::type> {}; 2182 2183#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2184template <class _Tp> 2185_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_assignable_v 2186 = is_move_assignable<_Tp>::value; 2187#endif 2188 2189// is_destructible 2190 2191// if it's a reference, return true 2192// if it's a function, return false 2193// if it's void, return false 2194// if it's an array of unknown bound, return false 2195// Otherwise, return "std::declval<_Up&>().~_Up()" is well-formed 2196// where _Up is remove_all_extents<_Tp>::type 2197 2198template <class> 2199struct __is_destructible_apply { typedef int type; }; 2200 2201template <typename _Tp> 2202struct __is_destructor_wellformed { 2203 template <typename _Tp1> 2204 static char __test ( 2205 typename __is_destructible_apply<decltype(_VSTD::declval<_Tp1&>().~_Tp1())>::type 2206 ); 2207 2208 template <typename _Tp1> 2209 static __two __test (...); 2210 2211 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2212}; 2213 2214template <class _Tp, bool> 2215struct __destructible_imp; 2216 2217template <class _Tp> 2218struct __destructible_imp<_Tp, false> 2219 : public _VSTD::integral_constant<bool, 2220 __is_destructor_wellformed<typename _VSTD::remove_all_extents<_Tp>::type>::value> {}; 2221 2222template <class _Tp> 2223struct __destructible_imp<_Tp, true> 2224 : public _VSTD::true_type {}; 2225 2226template <class _Tp, bool> 2227struct __destructible_false; 2228 2229template <class _Tp> 2230struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, _VSTD::is_reference<_Tp>::value> {}; 2231 2232template <class _Tp> 2233struct __destructible_false<_Tp, true> : public _VSTD::false_type {}; 2234 2235template <class _Tp> 2236struct is_destructible 2237 : public __destructible_false<_Tp, _VSTD::is_function<_Tp>::value> {}; 2238 2239template <class _Tp> 2240struct is_destructible<_Tp[]> 2241 : public _VSTD::false_type {}; 2242 2243template <> 2244struct is_destructible<void> 2245 : public _VSTD::false_type {}; 2246 2247#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2248template <class _Tp> 2249_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_destructible_v 2250 = is_destructible<_Tp>::value; 2251#endif 2252 2253// move 2254 2255template <class _Tp> 2256inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2257typename remove_reference<_Tp>::type&& 2258move(_Tp&& __t) _NOEXCEPT 2259{ 2260 typedef _LIBCPP_NODEBUG_TYPE typename remove_reference<_Tp>::type _Up; 2261 return static_cast<_Up&&>(__t); 2262} 2263 2264template <class _Tp> 2265inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2266_Tp&& 2267forward(typename remove_reference<_Tp>::type& __t) _NOEXCEPT 2268{ 2269 return static_cast<_Tp&&>(__t); 2270} 2271 2272template <class _Tp> 2273inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2274_Tp&& 2275forward(typename remove_reference<_Tp>::type&& __t) _NOEXCEPT 2276{ 2277 static_assert(!is_lvalue_reference<_Tp>::value, 2278 "can not forward an rvalue as an lvalue"); 2279 return static_cast<_Tp&&>(__t); 2280} 2281 2282template <class _Tp> 2283inline _LIBCPP_INLINE_VISIBILITY 2284typename decay<_Tp>::type 2285__decay_copy(_Tp&& __t) 2286{ 2287 return _VSTD::forward<_Tp>(__t); 2288} 2289 2290template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2291struct __member_pointer_traits_imp 2292{ 2293}; 2294 2295template <class _Rp, class _Class, class ..._Param> 2296struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 2297{ 2298 typedef _Class _ClassType; 2299 typedef _Rp _ReturnType; 2300 typedef _Rp (_FnType) (_Param...); 2301}; 2302 2303template <class _Rp, class _Class, class ..._Param> 2304struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 2305{ 2306 typedef _Class _ClassType; 2307 typedef _Rp _ReturnType; 2308 typedef _Rp (_FnType) (_Param..., ...); 2309}; 2310 2311template <class _Rp, class _Class, class ..._Param> 2312struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 2313{ 2314 typedef _Class const _ClassType; 2315 typedef _Rp _ReturnType; 2316 typedef _Rp (_FnType) (_Param...); 2317}; 2318 2319template <class _Rp, class _Class, class ..._Param> 2320struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 2321{ 2322 typedef _Class const _ClassType; 2323 typedef _Rp _ReturnType; 2324 typedef _Rp (_FnType) (_Param..., ...); 2325}; 2326 2327template <class _Rp, class _Class, class ..._Param> 2328struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 2329{ 2330 typedef _Class volatile _ClassType; 2331 typedef _Rp _ReturnType; 2332 typedef _Rp (_FnType) (_Param...); 2333}; 2334 2335template <class _Rp, class _Class, class ..._Param> 2336struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 2337{ 2338 typedef _Class volatile _ClassType; 2339 typedef _Rp _ReturnType; 2340 typedef _Rp (_FnType) (_Param..., ...); 2341}; 2342 2343template <class _Rp, class _Class, class ..._Param> 2344struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 2345{ 2346 typedef _Class const volatile _ClassType; 2347 typedef _Rp _ReturnType; 2348 typedef _Rp (_FnType) (_Param...); 2349}; 2350 2351template <class _Rp, class _Class, class ..._Param> 2352struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2353{ 2354 typedef _Class const volatile _ClassType; 2355 typedef _Rp _ReturnType; 2356 typedef _Rp (_FnType) (_Param..., ...); 2357}; 2358 2359#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2360 2361template <class _Rp, class _Class, class ..._Param> 2362struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 2363{ 2364 typedef _Class& _ClassType; 2365 typedef _Rp _ReturnType; 2366 typedef _Rp (_FnType) (_Param...); 2367}; 2368 2369template <class _Rp, class _Class, class ..._Param> 2370struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 2371{ 2372 typedef _Class& _ClassType; 2373 typedef _Rp _ReturnType; 2374 typedef _Rp (_FnType) (_Param..., ...); 2375}; 2376 2377template <class _Rp, class _Class, class ..._Param> 2378struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 2379{ 2380 typedef _Class const& _ClassType; 2381 typedef _Rp _ReturnType; 2382 typedef _Rp (_FnType) (_Param...); 2383}; 2384 2385template <class _Rp, class _Class, class ..._Param> 2386struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 2387{ 2388 typedef _Class const& _ClassType; 2389 typedef _Rp _ReturnType; 2390 typedef _Rp (_FnType) (_Param..., ...); 2391}; 2392 2393template <class _Rp, class _Class, class ..._Param> 2394struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 2395{ 2396 typedef _Class volatile& _ClassType; 2397 typedef _Rp _ReturnType; 2398 typedef _Rp (_FnType) (_Param...); 2399}; 2400 2401template <class _Rp, class _Class, class ..._Param> 2402struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 2403{ 2404 typedef _Class volatile& _ClassType; 2405 typedef _Rp _ReturnType; 2406 typedef _Rp (_FnType) (_Param..., ...); 2407}; 2408 2409template <class _Rp, class _Class, class ..._Param> 2410struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 2411{ 2412 typedef _Class const volatile& _ClassType; 2413 typedef _Rp _ReturnType; 2414 typedef _Rp (_FnType) (_Param...); 2415}; 2416 2417template <class _Rp, class _Class, class ..._Param> 2418struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 2419{ 2420 typedef _Class const volatile& _ClassType; 2421 typedef _Rp _ReturnType; 2422 typedef _Rp (_FnType) (_Param..., ...); 2423}; 2424 2425template <class _Rp, class _Class, class ..._Param> 2426struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 2427{ 2428 typedef _Class&& _ClassType; 2429 typedef _Rp _ReturnType; 2430 typedef _Rp (_FnType) (_Param...); 2431}; 2432 2433template <class _Rp, class _Class, class ..._Param> 2434struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 2435{ 2436 typedef _Class&& _ClassType; 2437 typedef _Rp _ReturnType; 2438 typedef _Rp (_FnType) (_Param..., ...); 2439}; 2440 2441template <class _Rp, class _Class, class ..._Param> 2442struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 2443{ 2444 typedef _Class const&& _ClassType; 2445 typedef _Rp _ReturnType; 2446 typedef _Rp (_FnType) (_Param...); 2447}; 2448 2449template <class _Rp, class _Class, class ..._Param> 2450struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 2451{ 2452 typedef _Class const&& _ClassType; 2453 typedef _Rp _ReturnType; 2454 typedef _Rp (_FnType) (_Param..., ...); 2455}; 2456 2457template <class _Rp, class _Class, class ..._Param> 2458struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 2459{ 2460 typedef _Class volatile&& _ClassType; 2461 typedef _Rp _ReturnType; 2462 typedef _Rp (_FnType) (_Param...); 2463}; 2464 2465template <class _Rp, class _Class, class ..._Param> 2466struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 2467{ 2468 typedef _Class volatile&& _ClassType; 2469 typedef _Rp _ReturnType; 2470 typedef _Rp (_FnType) (_Param..., ...); 2471}; 2472 2473template <class _Rp, class _Class, class ..._Param> 2474struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 2475{ 2476 typedef _Class const volatile&& _ClassType; 2477 typedef _Rp _ReturnType; 2478 typedef _Rp (_FnType) (_Param...); 2479}; 2480 2481template <class _Rp, class _Class, class ..._Param> 2482struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 2483{ 2484 typedef _Class const volatile&& _ClassType; 2485 typedef _Rp _ReturnType; 2486 typedef _Rp (_FnType) (_Param..., ...); 2487}; 2488 2489#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2490 2491 2492template <class _Rp, class _Class> 2493struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 2494{ 2495 typedef _Class _ClassType; 2496 typedef _Rp _ReturnType; 2497}; 2498 2499template <class _MP> 2500struct __member_pointer_traits 2501 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 2502 is_member_function_pointer<_MP>::value, 2503 is_member_object_pointer<_MP>::value> 2504{ 2505// typedef ... _ClassType; 2506// typedef ... _ReturnType; 2507// typedef ... _FnType; 2508}; 2509 2510 2511template <class _DecayedFp> 2512struct __member_pointer_class_type {}; 2513 2514template <class _Ret, class _ClassType> 2515struct __member_pointer_class_type<_Ret _ClassType::*> { 2516 typedef _ClassType type; 2517}; 2518 2519// result_of 2520 2521template <class _Callable> class result_of; 2522 2523#ifdef _LIBCPP_HAS_NO_VARIADICS 2524 2525template <class _Fn, bool, bool> 2526class __result_of 2527{ 2528}; 2529 2530template <class _Fn> 2531class __result_of<_Fn(), true, false> 2532{ 2533public: 2534 typedef decltype(declval<_Fn>()()) type; 2535}; 2536 2537template <class _Fn, class _A0> 2538class __result_of<_Fn(_A0), true, false> 2539{ 2540public: 2541 typedef decltype(declval<_Fn>()(declval<_A0>())) type; 2542}; 2543 2544template <class _Fn, class _A0, class _A1> 2545class __result_of<_Fn(_A0, _A1), true, false> 2546{ 2547public: 2548 typedef decltype(declval<_Fn>()(declval<_A0>(), declval<_A1>())) type; 2549}; 2550 2551template <class _Fn, class _A0, class _A1, class _A2> 2552class __result_of<_Fn(_A0, _A1, _A2), true, false> 2553{ 2554public: 2555 typedef decltype(declval<_Fn>()(declval<_A0>(), declval<_A1>(), declval<_A2>())) type; 2556}; 2557 2558template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 2559struct __result_of_mp; 2560 2561// member function pointer 2562 2563template <class _MP, class _Tp> 2564struct __result_of_mp<_MP, _Tp, true> 2565 : public __identity<typename __member_pointer_traits<_MP>::_ReturnType> 2566{ 2567}; 2568 2569// member data pointer 2570 2571template <class _MP, class _Tp, bool> 2572struct __result_of_mdp; 2573 2574template <class _Rp, class _Class, class _Tp> 2575struct __result_of_mdp<_Rp _Class::*, _Tp, false> 2576{ 2577 typedef typename __apply_cv<decltype(*_VSTD::declval<_Tp>()), _Rp>::type& type; 2578}; 2579 2580template <class _Rp, class _Class, class _Tp> 2581struct __result_of_mdp<_Rp _Class::*, _Tp, true> 2582{ 2583 typedef typename __apply_cv<_Tp, _Rp>::type& type; 2584}; 2585 2586template <class _Rp, class _Class, class _Tp> 2587struct __result_of_mp<_Rp _Class::*, _Tp, false> 2588 : public __result_of_mdp<_Rp _Class::*, _Tp, 2589 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 2590{ 2591}; 2592 2593 2594 2595template <class _Fn, class _Tp> 2596class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 2597 : public __result_of_mp<typename remove_reference<_Fn>::type, 2598 _Tp, 2599 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2600{ 2601}; 2602 2603template <class _Fn, class _Tp, class _A0> 2604class __result_of<_Fn(_Tp, _A0), false, true> // _Fn must be member pointer 2605 : public __result_of_mp<typename remove_reference<_Fn>::type, 2606 _Tp, 2607 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2608{ 2609}; 2610 2611template <class _Fn, class _Tp, class _A0, class _A1> 2612class __result_of<_Fn(_Tp, _A0, _A1), false, true> // _Fn must be member pointer 2613 : public __result_of_mp<typename remove_reference<_Fn>::type, 2614 _Tp, 2615 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2616{ 2617}; 2618 2619template <class _Fn, class _Tp, class _A0, class _A1, class _A2> 2620class __result_of<_Fn(_Tp, _A0, _A1, _A2), false, true> // _Fn must be member pointer 2621 : public __result_of_mp<typename remove_reference<_Fn>::type, 2622 _Tp, 2623 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 2624{ 2625}; 2626 2627// result_of 2628 2629template <class _Fn> 2630class _LIBCPP_TEMPLATE_VIS result_of<_Fn()> 2631 : public __result_of<_Fn(), 2632 is_class<typename remove_reference<_Fn>::type>::value || 2633 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2634 is_member_pointer<typename remove_reference<_Fn>::type>::value 2635 > 2636{ 2637}; 2638 2639template <class _Fn, class _A0> 2640class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_A0)> 2641 : public __result_of<_Fn(_A0), 2642 is_class<typename remove_reference<_Fn>::type>::value || 2643 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2644 is_member_pointer<typename remove_reference<_Fn>::type>::value 2645 > 2646{ 2647}; 2648 2649template <class _Fn, class _A0, class _A1> 2650class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_A0, _A1)> 2651 : public __result_of<_Fn(_A0, _A1), 2652 is_class<typename remove_reference<_Fn>::type>::value || 2653 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2654 is_member_pointer<typename remove_reference<_Fn>::type>::value 2655 > 2656{ 2657}; 2658 2659template <class _Fn, class _A0, class _A1, class _A2> 2660class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_A0, _A1, _A2)> 2661 : public __result_of<_Fn(_A0, _A1, _A2), 2662 is_class<typename remove_reference<_Fn>::type>::value || 2663 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 2664 is_member_pointer<typename remove_reference<_Fn>::type>::value 2665 > 2666{ 2667}; 2668 2669#endif // _LIBCPP_HAS_NO_VARIADICS 2670 2671// template <class T, class... Args> struct is_constructible; 2672 2673namespace __is_construct 2674{ 2675struct __nat {}; 2676} 2677 2678#if !defined(_LIBCPP_CXX03_LANG) && (!__has_feature(is_constructible) || \ 2679 defined(_LIBCPP_TESTING_FALLBACK_IS_CONSTRUCTIBLE)) 2680 2681template <class _Tp, class... _Args> 2682struct __libcpp_is_constructible; 2683 2684template <class _To, class _From> 2685struct __is_invalid_base_to_derived_cast { 2686 static_assert(is_reference<_To>::value, "Wrong specialization"); 2687 using _RawFrom = __uncvref_t<_From>; 2688 using _RawTo = __uncvref_t<_To>; 2689 static const bool value = _And< 2690 _IsNotSame<_RawFrom, _RawTo>, 2691 is_base_of<_RawFrom, _RawTo>, 2692 _Not<__libcpp_is_constructible<_RawTo, _From>> 2693 >::value; 2694}; 2695 2696template <class _To, class _From> 2697struct __is_invalid_lvalue_to_rvalue_cast : false_type { 2698 static_assert(is_reference<_To>::value, "Wrong specialization"); 2699}; 2700 2701template <class _ToRef, class _FromRef> 2702struct __is_invalid_lvalue_to_rvalue_cast<_ToRef&&, _FromRef&> { 2703 using _RawFrom = __uncvref_t<_FromRef>; 2704 using _RawTo = __uncvref_t<_ToRef>; 2705 static const bool value = _And< 2706 _Not<is_function<_RawTo>>, 2707 _Or< 2708 _IsSame<_RawFrom, _RawTo>, 2709 is_base_of<_RawTo, _RawFrom>> 2710 >::value; 2711}; 2712 2713struct __is_constructible_helper 2714{ 2715 template <class _To> 2716 static void __eat(_To); 2717 2718 // This overload is needed to work around a Clang bug that disallows 2719 // static_cast<T&&>(e) for non-reference-compatible types. 2720 // Example: static_cast<int&&>(declval<double>()); 2721 // NOTE: The static_cast implementation below is required to support 2722 // classes with explicit conversion operators. 2723 template <class _To, class _From, 2724 class = decltype(__eat<_To>(_VSTD::declval<_From>()))> 2725 static true_type __test_cast(int); 2726 2727 template <class _To, class _From, 2728 class = decltype(static_cast<_To>(_VSTD::declval<_From>()))> 2729 static integral_constant<bool, 2730 !__is_invalid_base_to_derived_cast<_To, _From>::value && 2731 !__is_invalid_lvalue_to_rvalue_cast<_To, _From>::value 2732 > __test_cast(long); 2733 2734 template <class, class> 2735 static false_type __test_cast(...); 2736 2737 template <class _Tp, class ..._Args, 2738 class = decltype(_Tp(_VSTD::declval<_Args>()...))> 2739 static true_type __test_nary(int); 2740 template <class _Tp, class...> 2741 static false_type __test_nary(...); 2742 2743 template <class _Tp, class _A0, class = decltype(::new _Tp(_VSTD::declval<_A0>()))> 2744 static is_destructible<_Tp> __test_unary(int); 2745 template <class, class> 2746 static false_type __test_unary(...); 2747}; 2748 2749template <class _Tp, bool = is_void<_Tp>::value> 2750struct __is_default_constructible 2751 : decltype(__is_constructible_helper::__test_nary<_Tp>(0)) 2752{}; 2753 2754template <class _Tp> 2755struct __is_default_constructible<_Tp, true> : false_type {}; 2756 2757template <class _Tp> 2758struct __is_default_constructible<_Tp[], false> : false_type {}; 2759 2760template <class _Tp, size_t _Nx> 2761struct __is_default_constructible<_Tp[_Nx], false> 2762 : __is_default_constructible<typename remove_all_extents<_Tp>::type> {}; 2763 2764template <class _Tp, class... _Args> 2765struct __libcpp_is_constructible 2766{ 2767 static_assert(sizeof...(_Args) > 1, "Wrong specialization"); 2768 typedef decltype(__is_constructible_helper::__test_nary<_Tp, _Args...>(0)) 2769 type; 2770}; 2771 2772template <class _Tp> 2773struct __libcpp_is_constructible<_Tp> : __is_default_constructible<_Tp> {}; 2774 2775template <class _Tp, class _A0> 2776struct __libcpp_is_constructible<_Tp, _A0> 2777 : public decltype(__is_constructible_helper::__test_unary<_Tp, _A0>(0)) 2778{}; 2779 2780template <class _Tp, class _A0> 2781struct __libcpp_is_constructible<_Tp&, _A0> 2782 : public decltype(__is_constructible_helper:: 2783 __test_cast<_Tp&, _A0>(0)) 2784{}; 2785 2786template <class _Tp, class _A0> 2787struct __libcpp_is_constructible<_Tp&&, _A0> 2788 : public decltype(__is_constructible_helper:: 2789 __test_cast<_Tp&&, _A0>(0)) 2790{}; 2791 2792#endif 2793 2794#if __has_feature(is_constructible) 2795template <class _Tp, class ..._Args> 2796struct _LIBCPP_TEMPLATE_VIS is_constructible 2797 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 2798 {}; 2799#else 2800template <class _Tp, class... _Args> 2801struct _LIBCPP_TEMPLATE_VIS is_constructible 2802 : public __libcpp_is_constructible<_Tp, _Args...>::type {}; 2803#endif 2804 2805#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2806template <class _Tp, class ..._Args> 2807_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_constructible_v 2808 = is_constructible<_Tp, _Args...>::value; 2809#endif 2810 2811// is_default_constructible 2812 2813template <class _Tp> 2814struct _LIBCPP_TEMPLATE_VIS is_default_constructible 2815 : public is_constructible<_Tp> 2816 {}; 2817 2818#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2819template <class _Tp> 2820_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_default_constructible_v 2821 = is_default_constructible<_Tp>::value; 2822#endif 2823 2824#ifndef _LIBCPP_CXX03_LANG 2825// First of all, we can't implement this check in C++03 mode because the {} 2826// default initialization syntax isn't valid. 2827// Second, we implement the trait in a funny manner with two defaulted template 2828// arguments to workaround Clang's PR43454. 2829template <class _Tp> 2830void __test_implicit_default_constructible(_Tp); 2831 2832template <class _Tp, class = void, bool = is_default_constructible<_Tp>::value> 2833struct __is_implicitly_default_constructible 2834 : false_type 2835{ }; 2836 2837template <class _Tp> 2838struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true> 2839 : true_type 2840{ }; 2841 2842template <class _Tp> 2843struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false> 2844 : false_type 2845{ }; 2846#endif // !C++03 2847 2848// is_copy_constructible 2849 2850template <class _Tp> 2851struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 2852 : public is_constructible<_Tp, 2853 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2854 2855#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2856template <class _Tp> 2857_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_copy_constructible_v 2858 = is_copy_constructible<_Tp>::value; 2859#endif 2860 2861// is_move_constructible 2862 2863template <class _Tp> 2864struct _LIBCPP_TEMPLATE_VIS is_move_constructible 2865 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2866 {}; 2867 2868#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2869template <class _Tp> 2870_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_move_constructible_v 2871 = is_move_constructible<_Tp>::value; 2872#endif 2873 2874// is_trivially_constructible 2875 2876#if __has_feature(is_trivially_constructible) || _GNUC_VER >= 501 2877 2878template <class _Tp, class... _Args> 2879struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 2880 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 2881{ 2882}; 2883 2884#else // !__has_feature(is_trivially_constructible) 2885 2886template <class _Tp, class... _Args> 2887struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 2888 : false_type 2889{ 2890}; 2891 2892template <class _Tp> 2893struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp> 2894#if __has_feature(has_trivial_constructor) || defined(_LIBCPP_COMPILER_GCC) 2895 : integral_constant<bool, __has_trivial_constructor(_Tp)> 2896#else 2897 : integral_constant<bool, is_scalar<_Tp>::value> 2898#endif 2899{ 2900}; 2901 2902template <class _Tp> 2903struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&&> 2904 : integral_constant<bool, is_scalar<_Tp>::value> 2905{ 2906}; 2907 2908template <class _Tp> 2909struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, const _Tp&> 2910 : integral_constant<bool, is_scalar<_Tp>::value> 2911{ 2912}; 2913 2914template <class _Tp> 2915struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible<_Tp, _Tp&> 2916 : integral_constant<bool, is_scalar<_Tp>::value> 2917{ 2918}; 2919 2920#endif // !__has_feature(is_trivially_constructible) 2921 2922 2923#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2924template <class _Tp, class... _Args> 2925_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_constructible_v 2926 = is_trivially_constructible<_Tp, _Args...>::value; 2927#endif 2928 2929// is_trivially_default_constructible 2930 2931template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 2932 : public is_trivially_constructible<_Tp> 2933 {}; 2934 2935#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2936template <class _Tp> 2937_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_default_constructible_v 2938 = is_trivially_default_constructible<_Tp>::value; 2939#endif 2940 2941// is_trivially_copy_constructible 2942 2943template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 2944 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 2945 {}; 2946 2947#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2948template <class _Tp> 2949_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_constructible_v 2950 = is_trivially_copy_constructible<_Tp>::value; 2951#endif 2952 2953// is_trivially_move_constructible 2954 2955template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 2956 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2957 {}; 2958 2959#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 2960template <class _Tp> 2961_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_constructible_v 2962 = is_trivially_move_constructible<_Tp>::value; 2963#endif 2964 2965// is_trivially_assignable 2966 2967#if __has_feature(is_trivially_assignable) || _GNUC_VER >= 501 2968 2969template <class _Tp, class _Arg> 2970struct is_trivially_assignable 2971 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 2972{ 2973}; 2974 2975#else // !__has_feature(is_trivially_assignable) 2976 2977template <class _Tp, class _Arg> 2978struct is_trivially_assignable 2979 : public false_type {}; 2980 2981template <class _Tp> 2982struct is_trivially_assignable<_Tp&, _Tp> 2983 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2984 2985template <class _Tp> 2986struct is_trivially_assignable<_Tp&, _Tp&> 2987 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2988 2989template <class _Tp> 2990struct is_trivially_assignable<_Tp&, const _Tp&> 2991 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2992 2993template <class _Tp> 2994struct is_trivially_assignable<_Tp&, _Tp&&> 2995 : integral_constant<bool, is_scalar<_Tp>::value> {}; 2996 2997#endif // !__has_feature(is_trivially_assignable) 2998 2999#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3000template <class _Tp, class _Arg> 3001_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_assignable_v 3002 = is_trivially_assignable<_Tp, _Arg>::value; 3003#endif 3004 3005// is_trivially_copy_assignable 3006 3007template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 3008 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3009 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3010 3011#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3012template <class _Tp> 3013_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copy_assignable_v 3014 = is_trivially_copy_assignable<_Tp>::value; 3015#endif 3016 3017// is_trivially_move_assignable 3018 3019template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3020 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3021 typename add_rvalue_reference<_Tp>::type> 3022 {}; 3023 3024#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3025template <class _Tp> 3026_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_assignable_v 3027 = is_trivially_move_assignable<_Tp>::value; 3028#endif 3029 3030// is_trivially_destructible 3031 3032#if __has_keyword(__is_trivially_destructible) 3033 3034template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3035 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3036 3037#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3038 3039template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3040 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3041 3042#else 3043 3044template <class _Tp> struct __libcpp_trivial_destructor 3045 : public integral_constant<bool, is_scalar<_Tp>::value || 3046 is_reference<_Tp>::value> {}; 3047 3048template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3049 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3050 3051template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3052 : public false_type {}; 3053 3054#endif 3055 3056#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3057template <class _Tp> 3058_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_destructible_v 3059 = is_trivially_destructible<_Tp>::value; 3060#endif 3061 3062// is_nothrow_constructible 3063 3064#if __has_keyword(__is_nothrow_constructible) 3065 3066template <class _Tp, class... _Args> 3067struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3068 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3069 3070#else 3071 3072template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3073 3074template <class _Tp, class... _Args> 3075struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3076 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3077{ 3078}; 3079 3080template <class _Tp> 3081void __implicit_conversion_to(_Tp) noexcept { } 3082 3083template <class _Tp, class _Arg> 3084struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3085 : public integral_constant<bool, noexcept(__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3086{ 3087}; 3088 3089template <class _Tp, bool _IsReference, class... _Args> 3090struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3091 : public false_type 3092{ 3093}; 3094 3095template <class _Tp, class... _Args> 3096struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3097 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3098{ 3099}; 3100 3101template <class _Tp, size_t _Ns> 3102struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3103 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3104{ 3105}; 3106 3107#endif // _LIBCPP_HAS_NO_NOEXCEPT 3108 3109 3110#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3111template <class _Tp, class ..._Args> 3112_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_constructible_v 3113 = is_nothrow_constructible<_Tp, _Args...>::value; 3114#endif 3115 3116// is_nothrow_default_constructible 3117 3118template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3119 : public is_nothrow_constructible<_Tp> 3120 {}; 3121 3122#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3123template <class _Tp> 3124_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_default_constructible_v 3125 = is_nothrow_default_constructible<_Tp>::value; 3126#endif 3127 3128// is_nothrow_copy_constructible 3129 3130template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3131 : public is_nothrow_constructible<_Tp, 3132 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3133 3134#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3135template <class _Tp> 3136_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_constructible_v 3137 = is_nothrow_copy_constructible<_Tp>::value; 3138#endif 3139 3140// is_nothrow_move_constructible 3141 3142template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3143 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3144 {}; 3145 3146#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3147template <class _Tp> 3148_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_constructible_v 3149 = is_nothrow_move_constructible<_Tp>::value; 3150#endif 3151 3152// is_nothrow_assignable 3153 3154#if __has_keyword(__is_nothrow_assignable) 3155 3156template <class _Tp, class _Arg> 3157struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3158 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3159 3160#else 3161 3162template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3163 3164template <class _Tp, class _Arg> 3165struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3166 : public false_type 3167{ 3168}; 3169 3170template <class _Tp, class _Arg> 3171struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3172 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>() = _VSTD::declval<_Arg>()) > 3173{ 3174}; 3175 3176template <class _Tp, class _Arg> 3177struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3178 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3179{ 3180}; 3181 3182#endif // _LIBCPP_HAS_NO_NOEXCEPT 3183 3184#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3185template <class _Tp, class _Arg> 3186_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_assignable_v 3187 = is_nothrow_assignable<_Tp, _Arg>::value; 3188#endif 3189 3190// is_nothrow_copy_assignable 3191 3192template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3193 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3194 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3195 3196#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3197template <class _Tp> 3198_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_copy_assignable_v 3199 = is_nothrow_copy_assignable<_Tp>::value; 3200#endif 3201 3202// is_nothrow_move_assignable 3203 3204template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_assignable 3205 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3206 typename add_rvalue_reference<_Tp>::type> 3207 {}; 3208 3209#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3210template <class _Tp> 3211_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_assignable_v 3212 = is_nothrow_move_assignable<_Tp>::value; 3213#endif 3214 3215// is_nothrow_destructible 3216 3217#if !defined(_LIBCPP_CXX03_LANG) 3218 3219template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3220 3221template <class _Tp> 3222struct __libcpp_is_nothrow_destructible<false, _Tp> 3223 : public false_type 3224{ 3225}; 3226 3227template <class _Tp> 3228struct __libcpp_is_nothrow_destructible<true, _Tp> 3229 : public integral_constant<bool, noexcept(_VSTD::declval<_Tp>().~_Tp()) > 3230{ 3231}; 3232 3233template <class _Tp> 3234struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3235 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3236{ 3237}; 3238 3239template <class _Tp, size_t _Ns> 3240struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3241 : public is_nothrow_destructible<_Tp> 3242{ 3243}; 3244 3245template <class _Tp> 3246struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3247 : public true_type 3248{ 3249}; 3250 3251template <class _Tp> 3252struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3253 : public true_type 3254{ 3255}; 3256 3257#else 3258 3259template <class _Tp> struct __libcpp_nothrow_destructor 3260 : public integral_constant<bool, is_scalar<_Tp>::value || 3261 is_reference<_Tp>::value> {}; 3262 3263template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3264 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3265 3266template <class _Tp> 3267struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3268 : public false_type {}; 3269 3270#endif 3271 3272#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3273template <class _Tp> 3274_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_destructible_v 3275 = is_nothrow_destructible<_Tp>::value; 3276#endif 3277 3278// is_pod 3279 3280#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3281 3282template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3283 : public integral_constant<bool, __is_pod(_Tp)> {}; 3284 3285#else 3286 3287template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3288 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3289 is_trivially_copy_constructible<_Tp>::value && 3290 is_trivially_copy_assignable<_Tp>::value && 3291 is_trivially_destructible<_Tp>::value> {}; 3292 3293#endif 3294 3295#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3296template <class _Tp> 3297_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_pod_v 3298 = is_pod<_Tp>::value; 3299#endif 3300 3301// is_literal_type; 3302 3303template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_literal_type 3304 : public integral_constant<bool, __is_literal_type(_Tp)> 3305 {}; 3306 3307#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3308template <class _Tp> 3309_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_literal_type_v 3310 = is_literal_type<_Tp>::value; 3311#endif 3312 3313// is_standard_layout; 3314 3315template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3316#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3317 : public integral_constant<bool, __is_standard_layout(_Tp)> 3318#else 3319 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3320#endif 3321 {}; 3322 3323#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3324template <class _Tp> 3325_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_standard_layout_v 3326 = is_standard_layout<_Tp>::value; 3327#endif 3328 3329// is_trivially_copyable; 3330 3331template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3332#if __has_feature(is_trivially_copyable) 3333 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3334#elif _GNUC_VER >= 501 3335 : public integral_constant<bool, !is_volatile<_Tp>::value && __is_trivially_copyable(_Tp)> 3336#else 3337 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3338#endif 3339 {}; 3340 3341#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3342template <class _Tp> 3343_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_copyable_v 3344 = is_trivially_copyable<_Tp>::value; 3345#endif 3346 3347// is_trivial; 3348 3349template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3350#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3351 : public integral_constant<bool, __is_trivial(_Tp)> 3352#else 3353 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3354 is_trivially_default_constructible<_Tp>::value> 3355#endif 3356 {}; 3357 3358#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) 3359template <class _Tp> 3360_LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivial_v 3361 = is_trivial<_Tp>::value; 3362#endif 3363 3364template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3365template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3366template <class _Tp> struct __is_reference_wrapper 3367 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3368 3369#ifndef _LIBCPP_CXX03_LANG 3370 3371template <class _Fp, class _A0, 3372 class _DecayFp = typename decay<_Fp>::type, 3373 class _DecayA0 = typename decay<_A0>::type, 3374 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3375using __enable_if_bullet1 = typename enable_if 3376 < 3377 is_member_function_pointer<_DecayFp>::value 3378 && is_base_of<_ClassT, _DecayA0>::value 3379 >::type; 3380 3381template <class _Fp, class _A0, 3382 class _DecayFp = typename decay<_Fp>::type, 3383 class _DecayA0 = typename decay<_A0>::type> 3384using __enable_if_bullet2 = typename enable_if 3385 < 3386 is_member_function_pointer<_DecayFp>::value 3387 && __is_reference_wrapper<_DecayA0>::value 3388 >::type; 3389 3390template <class _Fp, class _A0, 3391 class _DecayFp = typename decay<_Fp>::type, 3392 class _DecayA0 = typename decay<_A0>::type, 3393 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3394using __enable_if_bullet3 = typename enable_if 3395 < 3396 is_member_function_pointer<_DecayFp>::value 3397 && !is_base_of<_ClassT, _DecayA0>::value 3398 && !__is_reference_wrapper<_DecayA0>::value 3399 >::type; 3400 3401template <class _Fp, class _A0, 3402 class _DecayFp = typename decay<_Fp>::type, 3403 class _DecayA0 = typename decay<_A0>::type, 3404 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3405using __enable_if_bullet4 = typename enable_if 3406 < 3407 is_member_object_pointer<_DecayFp>::value 3408 && is_base_of<_ClassT, _DecayA0>::value 3409 >::type; 3410 3411template <class _Fp, class _A0, 3412 class _DecayFp = typename decay<_Fp>::type, 3413 class _DecayA0 = typename decay<_A0>::type> 3414using __enable_if_bullet5 = typename enable_if 3415 < 3416 is_member_object_pointer<_DecayFp>::value 3417 && __is_reference_wrapper<_DecayA0>::value 3418 >::type; 3419 3420template <class _Fp, class _A0, 3421 class _DecayFp = typename decay<_Fp>::type, 3422 class _DecayA0 = typename decay<_A0>::type, 3423 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3424using __enable_if_bullet6 = typename enable_if 3425 < 3426 is_member_object_pointer<_DecayFp>::value 3427 && !is_base_of<_ClassT, _DecayA0>::value 3428 && !__is_reference_wrapper<_DecayA0>::value 3429 >::type; 3430 3431// __invoke forward declarations 3432 3433// fall back - none of the bullets 3434 3435#define _LIBCPP_INVOKE_RETURN(...) \ 3436 noexcept(noexcept(__VA_ARGS__)) -> decltype(__VA_ARGS__) \ 3437 { return __VA_ARGS__; } 3438 3439template <class ..._Args> 3440auto __invoke(__any, _Args&& ...__args) -> __nat; 3441 3442template <class ..._Args> 3443auto __invoke_constexpr(__any, _Args&& ...__args) -> __nat; 3444 3445// bullets 1, 2 and 3 3446 3447template <class _Fp, class _A0, class ..._Args, 3448 class = __enable_if_bullet1<_Fp, _A0>> 3449inline _LIBCPP_INLINE_VISIBILITY 3450auto 3451__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3452_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3453 3454template <class _Fp, class _A0, class ..._Args, 3455 class = __enable_if_bullet1<_Fp, _A0>> 3456inline _LIBCPP_INLINE_VISIBILITY 3457_LIBCPP_CONSTEXPR auto 3458__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3459_LIBCPP_INVOKE_RETURN((_VSTD::forward<_A0>(__a0).*__f)(_VSTD::forward<_Args>(__args)...)) 3460 3461template <class _Fp, class _A0, class ..._Args, 3462 class = __enable_if_bullet2<_Fp, _A0>> 3463inline _LIBCPP_INLINE_VISIBILITY 3464auto 3465__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3466_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3467 3468template <class _Fp, class _A0, class ..._Args, 3469 class = __enable_if_bullet2<_Fp, _A0>> 3470inline _LIBCPP_INLINE_VISIBILITY 3471_LIBCPP_CONSTEXPR auto 3472__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3473_LIBCPP_INVOKE_RETURN((__a0.get().*__f)(_VSTD::forward<_Args>(__args)...)) 3474 3475template <class _Fp, class _A0, class ..._Args, 3476 class = __enable_if_bullet3<_Fp, _A0>> 3477inline _LIBCPP_INLINE_VISIBILITY 3478auto 3479__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3480_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3481 3482template <class _Fp, class _A0, class ..._Args, 3483 class = __enable_if_bullet3<_Fp, _A0>> 3484inline _LIBCPP_INLINE_VISIBILITY 3485_LIBCPP_CONSTEXPR auto 3486__invoke_constexpr(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3487_LIBCPP_INVOKE_RETURN(((*_VSTD::forward<_A0>(__a0)).*__f)(_VSTD::forward<_Args>(__args)...)) 3488 3489// bullets 4, 5 and 6 3490 3491template <class _Fp, class _A0, 3492 class = __enable_if_bullet4<_Fp, _A0>> 3493inline _LIBCPP_INLINE_VISIBILITY 3494auto 3495__invoke(_Fp&& __f, _A0&& __a0) 3496_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3497 3498template <class _Fp, class _A0, 3499 class = __enable_if_bullet4<_Fp, _A0>> 3500inline _LIBCPP_INLINE_VISIBILITY 3501_LIBCPP_CONSTEXPR auto 3502__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3503_LIBCPP_INVOKE_RETURN(_VSTD::forward<_A0>(__a0).*__f) 3504 3505template <class _Fp, class _A0, 3506 class = __enable_if_bullet5<_Fp, _A0>> 3507inline _LIBCPP_INLINE_VISIBILITY 3508auto 3509__invoke(_Fp&& __f, _A0&& __a0) 3510_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3511 3512template <class _Fp, class _A0, 3513 class = __enable_if_bullet5<_Fp, _A0>> 3514inline _LIBCPP_INLINE_VISIBILITY 3515_LIBCPP_CONSTEXPR auto 3516__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3517_LIBCPP_INVOKE_RETURN(__a0.get().*__f) 3518 3519template <class _Fp, class _A0, 3520 class = __enable_if_bullet6<_Fp, _A0>> 3521inline _LIBCPP_INLINE_VISIBILITY 3522auto 3523__invoke(_Fp&& __f, _A0&& __a0) 3524_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3525 3526template <class _Fp, class _A0, 3527 class = __enable_if_bullet6<_Fp, _A0>> 3528inline _LIBCPP_INLINE_VISIBILITY 3529_LIBCPP_CONSTEXPR auto 3530__invoke_constexpr(_Fp&& __f, _A0&& __a0) 3531_LIBCPP_INVOKE_RETURN((*_VSTD::forward<_A0>(__a0)).*__f) 3532 3533// bullet 7 3534 3535template <class _Fp, class ..._Args> 3536inline _LIBCPP_INLINE_VISIBILITY 3537auto 3538__invoke(_Fp&& __f, _Args&& ...__args) 3539_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3540 3541template <class _Fp, class ..._Args> 3542inline _LIBCPP_INLINE_VISIBILITY 3543_LIBCPP_CONSTEXPR auto 3544__invoke_constexpr(_Fp&& __f, _Args&& ...__args) 3545_LIBCPP_INVOKE_RETURN(_VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...)) 3546 3547#undef _LIBCPP_INVOKE_RETURN 3548 3549// __invokable 3550template <class _Ret, class _Fp, class ..._Args> 3551struct __invokable_r 3552{ 3553 template <class _XFp, class ..._XArgs> 3554 static auto __try_call(int) -> decltype( 3555 _VSTD::__invoke(_VSTD::declval<_XFp>(), _VSTD::declval<_XArgs>()...)); 3556 template <class _XFp, class ..._XArgs> 3557 static __nat __try_call(...); 3558 3559 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3560 // or incomplete array types as required by the standard. 3561 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3562 3563 using type = 3564 typename conditional< 3565 _IsNotSame<_Result, __nat>::value, 3566 typename conditional< 3567 is_void<_Ret>::value, 3568 true_type, 3569 is_convertible<_Result, _Ret> 3570 >::type, 3571 false_type 3572 >::type; 3573 static const bool value = type::value; 3574}; 3575template <class _Fp, class ..._Args> 3576using __invokable = __invokable_r<void, _Fp, _Args...>; 3577 3578template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3579struct __nothrow_invokable_r_imp { 3580 static const bool value = false; 3581}; 3582 3583template <class _Ret, class _Fp, class ..._Args> 3584struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3585{ 3586 typedef __nothrow_invokable_r_imp _ThisT; 3587 3588 template <class _Tp> 3589 static void __test_noexcept(_Tp) noexcept; 3590 3591 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3592 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...))); 3593}; 3594 3595template <class _Ret, class _Fp, class ..._Args> 3596struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3597{ 3598 static const bool value = noexcept( 3599 _VSTD::__invoke(_VSTD::declval<_Fp>(), _VSTD::declval<_Args>()...)); 3600}; 3601 3602template <class _Ret, class _Fp, class ..._Args> 3603using __nothrow_invokable_r = 3604 __nothrow_invokable_r_imp< 3605 __invokable_r<_Ret, _Fp, _Args...>::value, 3606 is_void<_Ret>::value, 3607 _Ret, _Fp, _Args... 3608 >; 3609 3610template <class _Fp, class ..._Args> 3611using __nothrow_invokable = 3612 __nothrow_invokable_r_imp< 3613 __invokable<_Fp, _Args...>::value, 3614 true, void, _Fp, _Args... 3615 >; 3616 3617template <class _Fp, class ..._Args> 3618struct __invoke_of 3619 : public enable_if< 3620 __invokable<_Fp, _Args...>::value, 3621 typename __invokable_r<void, _Fp, _Args...>::_Result> 3622{ 3623}; 3624 3625// result_of 3626 3627template <class _Fp, class ..._Args> 3628class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 3629 : public __invoke_of<_Fp, _Args...> 3630{ 3631}; 3632 3633#if _LIBCPP_STD_VER > 11 3634template <class _Tp> using result_of_t = typename result_of<_Tp>::type; 3635#endif 3636 3637#if _LIBCPP_STD_VER > 14 3638 3639// invoke_result 3640 3641template <class _Fn, class... _Args> 3642struct _LIBCPP_TEMPLATE_VIS invoke_result 3643 : __invoke_of<_Fn, _Args...> 3644{ 3645}; 3646 3647template <class _Fn, class... _Args> 3648using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 3649 3650// is_invocable 3651 3652template <class _Fn, class ..._Args> 3653struct _LIBCPP_TEMPLATE_VIS is_invocable 3654 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 3655 3656template <class _Ret, class _Fn, class ..._Args> 3657struct _LIBCPP_TEMPLATE_VIS is_invocable_r 3658 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 3659 3660template <class _Fn, class ..._Args> 3661_LIBCPP_INLINE_VAR constexpr bool is_invocable_v 3662 = is_invocable<_Fn, _Args...>::value; 3663 3664template <class _Ret, class _Fn, class ..._Args> 3665_LIBCPP_INLINE_VAR constexpr bool is_invocable_r_v 3666 = is_invocable_r<_Ret, _Fn, _Args...>::value; 3667 3668// is_nothrow_invocable 3669 3670template <class _Fn, class ..._Args> 3671struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 3672 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 3673 3674template <class _Ret, class _Fn, class ..._Args> 3675struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 3676 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 3677 3678template <class _Fn, class ..._Args> 3679_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_v 3680 = is_nothrow_invocable<_Fn, _Args...>::value; 3681 3682template <class _Ret, class _Fn, class ..._Args> 3683_LIBCPP_INLINE_VAR constexpr bool is_nothrow_invocable_r_v 3684 = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 3685 3686#endif // _LIBCPP_STD_VER > 14 3687 3688#endif // !defined(_LIBCPP_CXX03_LANG) 3689 3690template <class _Tp> struct __is_swappable; 3691template <class _Tp> struct __is_nothrow_swappable; 3692 3693// swap, swap_ranges 3694 3695template <class _ForwardIterator1, class _ForwardIterator2> 3696inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3697_ForwardIterator2 3698swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2); 3699 3700template <class _Tp> 3701inline _LIBCPP_INLINE_VISIBILITY 3702#ifndef _LIBCPP_CXX03_LANG 3703typename enable_if 3704< 3705 is_move_constructible<_Tp>::value && 3706 is_move_assignable<_Tp>::value 3707>::type 3708#else 3709void 3710#endif 3711_LIBCPP_CONSTEXPR_AFTER_CXX17 3712swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 3713 is_nothrow_move_assignable<_Tp>::value) 3714{ 3715 _Tp __t(_VSTD::move(__x)); 3716 __x = _VSTD::move(__y); 3717 __y = _VSTD::move(__t); 3718} 3719 3720template<class _Tp, size_t _Np> 3721inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3722typename enable_if< 3723 __is_swappable<_Tp>::value 3724>::type 3725swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value) 3726{ 3727 _VSTD::swap_ranges(__a, __a + _Np, __b); 3728} 3729 3730template <class _ForwardIterator1, class _ForwardIterator2> 3731inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3732_ForwardIterator2 3733swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) 3734{ 3735 for(; __first1 != __last1; ++__first1, (void) ++__first2) 3736 swap(*__first1, *__first2); 3737 return __first2; 3738} 3739 3740// iter_swap 3741 3742template <class _ForwardIterator1, class _ForwardIterator2> 3743inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3744void 3745iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b) 3746 // _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b))) 3747 _NOEXCEPT_(_NOEXCEPT_(swap(*_VSTD::declval<_ForwardIterator1>(), 3748 *_VSTD::declval<_ForwardIterator2>()))) 3749{ 3750 swap(*__a, *__b); 3751} 3752 3753// __swappable 3754 3755namespace __detail 3756{ 3757// ALL generic swap overloads MUST already have a declaration available at this point. 3758 3759template <class _Tp, class _Up = _Tp, 3760 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 3761struct __swappable_with 3762{ 3763 template <class _LHS, class _RHS> 3764 static decltype(swap(_VSTD::declval<_LHS>(), _VSTD::declval<_RHS>())) 3765 __test_swap(int); 3766 template <class, class> 3767 static __nat __test_swap(long); 3768 3769 // Extra parens are needed for the C++03 definition of decltype. 3770 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 3771 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 3772 3773 static const bool value = _IsNotSame<__swap1, __nat>::value 3774 && _IsNotSame<__swap2, __nat>::value; 3775}; 3776 3777template <class _Tp, class _Up> 3778struct __swappable_with<_Tp, _Up, false> : false_type {}; 3779 3780template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 3781struct __nothrow_swappable_with { 3782 static const bool value = 3783#ifndef _LIBCPP_HAS_NO_NOEXCEPT 3784 noexcept(swap(_VSTD::declval<_Tp>(), _VSTD::declval<_Up>())) 3785 && noexcept(swap(_VSTD::declval<_Up>(), _VSTD::declval<_Tp>())); 3786#else 3787 false; 3788#endif 3789}; 3790 3791template <class _Tp, class _Up> 3792struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 3793 3794} // __detail 3795 3796template <class _Tp> 3797struct __is_swappable 3798 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 3799{ 3800}; 3801 3802template <class _Tp> 3803struct __is_nothrow_swappable 3804 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 3805{ 3806}; 3807 3808#if _LIBCPP_STD_VER > 14 3809 3810template <class _Tp, class _Up> 3811struct _LIBCPP_TEMPLATE_VIS is_swappable_with 3812 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 3813{ 3814}; 3815 3816template <class _Tp> 3817struct _LIBCPP_TEMPLATE_VIS is_swappable 3818 : public conditional< 3819 __is_referenceable<_Tp>::value, 3820 is_swappable_with< 3821 typename add_lvalue_reference<_Tp>::type, 3822 typename add_lvalue_reference<_Tp>::type>, 3823 false_type 3824 >::type 3825{ 3826}; 3827 3828template <class _Tp, class _Up> 3829struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 3830 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 3831{ 3832}; 3833 3834template <class _Tp> 3835struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 3836 : public conditional< 3837 __is_referenceable<_Tp>::value, 3838 is_nothrow_swappable_with< 3839 typename add_lvalue_reference<_Tp>::type, 3840 typename add_lvalue_reference<_Tp>::type>, 3841 false_type 3842 >::type 3843{ 3844}; 3845 3846template <class _Tp, class _Up> 3847_LIBCPP_INLINE_VAR constexpr bool is_swappable_with_v 3848 = is_swappable_with<_Tp, _Up>::value; 3849 3850template <class _Tp> 3851_LIBCPP_INLINE_VAR constexpr bool is_swappable_v 3852 = is_swappable<_Tp>::value; 3853 3854template <class _Tp, class _Up> 3855_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_with_v 3856 = is_nothrow_swappable_with<_Tp, _Up>::value; 3857 3858template <class _Tp> 3859_LIBCPP_INLINE_VAR constexpr bool is_nothrow_swappable_v 3860 = is_nothrow_swappable<_Tp>::value; 3861 3862#endif // _LIBCPP_STD_VER > 14 3863 3864template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 3865 3866template <class _Tp> 3867struct __underlying_type_impl<_Tp, false> {}; 3868 3869template <class _Tp> 3870struct __underlying_type_impl<_Tp, true> 3871{ 3872 typedef __underlying_type(_Tp) type; 3873}; 3874 3875template <class _Tp> 3876struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 3877 3878#if _LIBCPP_STD_VER > 11 3879template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 3880#endif 3881 3882 3883template <class _Tp, bool = is_enum<_Tp>::value> 3884struct __sfinae_underlying_type 3885{ 3886 typedef typename underlying_type<_Tp>::type type; 3887 typedef decltype(((type)1) + 0) __promoted_type; 3888}; 3889 3890template <class _Tp> 3891struct __sfinae_underlying_type<_Tp, false> {}; 3892 3893inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3894int __convert_to_integral(int __val) { return __val; } 3895 3896inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3897unsigned __convert_to_integral(unsigned __val) { return __val; } 3898 3899inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3900long __convert_to_integral(long __val) { return __val; } 3901 3902inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3903unsigned long __convert_to_integral(unsigned long __val) { return __val; } 3904 3905inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3906long long __convert_to_integral(long long __val) { return __val; } 3907 3908inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3909unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 3910 3911template<typename _Fp> 3912inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3913typename enable_if<is_floating_point<_Fp>::value, long long>::type 3914 __convert_to_integral(_Fp __val) { return __val; } 3915 3916#ifndef _LIBCPP_HAS_NO_INT128 3917inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3918__int128_t __convert_to_integral(__int128_t __val) { return __val; } 3919 3920inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3921__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 3922#endif 3923 3924template <class _Tp> 3925inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3926typename __sfinae_underlying_type<_Tp>::__promoted_type 3927__convert_to_integral(_Tp __val) { return __val; } 3928 3929#ifndef _LIBCPP_CXX03_LANG 3930 3931template <class _Tp> 3932struct __has_operator_addressof_member_imp 3933{ 3934 template <class _Up> 3935 static auto __test(int) 3936 -> typename __select_2nd<decltype(_VSTD::declval<_Up>().operator&()), true_type>::type; 3937 template <class> 3938 static auto __test(long) -> false_type; 3939 3940 static const bool value = decltype(__test<_Tp>(0))::value; 3941}; 3942 3943template <class _Tp> 3944struct __has_operator_addressof_free_imp 3945{ 3946 template <class _Up> 3947 static auto __test(int) 3948 -> typename __select_2nd<decltype(operator&(_VSTD::declval<_Up>())), true_type>::type; 3949 template <class> 3950 static auto __test(long) -> false_type; 3951 3952 static const bool value = decltype(__test<_Tp>(0))::value; 3953}; 3954 3955template <class _Tp> 3956struct __has_operator_addressof 3957 : public integral_constant<bool, __has_operator_addressof_member_imp<_Tp>::value 3958 || __has_operator_addressof_free_imp<_Tp>::value> 3959{}; 3960 3961#endif // _LIBCPP_CXX03_LANG 3962 3963#if _LIBCPP_STD_VER > 14 3964 3965template <class...> using void_t = void; 3966 3967template <class... _Args> 3968struct conjunction : _And<_Args...> {}; 3969template<class... _Args> 3970_LIBCPP_INLINE_VAR constexpr bool conjunction_v 3971 = conjunction<_Args...>::value; 3972 3973template <class... _Args> 3974struct disjunction : _Or<_Args...> {}; 3975template<class... _Args> 3976_LIBCPP_INLINE_VAR constexpr bool disjunction_v 3977 = disjunction<_Args...>::value; 3978 3979template <class _Tp> 3980struct negation : _Not<_Tp> {}; 3981template<class _Tp> 3982_LIBCPP_INLINE_VAR constexpr bool negation_v 3983 = negation<_Tp>::value; 3984#endif // _LIBCPP_STD_VER > 14 3985 3986// These traits are used in __tree and __hash_table 3987#ifndef _LIBCPP_CXX03_LANG 3988struct __extract_key_fail_tag {}; 3989struct __extract_key_self_tag {}; 3990struct __extract_key_first_tag {}; 3991 3992template <class _ValTy, class _Key, 3993 class _RawValTy = typename __unconstref<_ValTy>::type> 3994struct __can_extract_key 3995 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 3996 __extract_key_fail_tag>::type {}; 3997 3998template <class _Pair, class _Key, class _First, class _Second> 3999struct __can_extract_key<_Pair, _Key, pair<_First, _Second>> 4000 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 4001 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 4002 4003// __can_extract_map_key uses true_type/false_type instead of the tags. 4004// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 4005// and _ValTy == _Key. 4006template <class _ValTy, class _Key, class _ContainerValueTy, 4007 class _RawValTy = typename __unconstref<_ValTy>::type> 4008struct __can_extract_map_key 4009 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 4010 4011// This specialization returns __extract_key_fail_tag for non-map containers 4012// because _Key == _ContainerValueTy 4013template <class _ValTy, class _Key, class _RawValTy> 4014struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 4015 : false_type {}; 4016 4017#endif 4018 4019#ifndef _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED 4020#if _LIBCPP_STD_VER > 17 4021_LIBCPP_INLINE_VISIBILITY 4022inline constexpr bool is_constant_evaluated() noexcept { 4023 return __builtin_is_constant_evaluated(); 4024} 4025#endif 4026 4027inline _LIBCPP_CONSTEXPR 4028bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 4029#else 4030inline _LIBCPP_CONSTEXPR 4031bool __libcpp_is_constant_evaluated() _NOEXCEPT { return false; } 4032#endif 4033 4034template <class _CharT> 4035using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 4036 4037_LIBCPP_END_NAMESPACE_STD 4038 4039#if _LIBCPP_STD_VER > 14 4040// std::byte 4041namespace std // purposefully not versioned 4042{ 4043template <class _Integer> 4044 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type & 4045 operator<<=(byte& __lhs, _Integer __shift) noexcept 4046 { return __lhs = __lhs << __shift; } 4047 4048template <class _Integer> 4049 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type 4050 operator<< (byte __lhs, _Integer __shift) noexcept 4051 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) << __shift)); } 4052 4053template <class _Integer> 4054 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type & 4055 operator>>=(byte& __lhs, _Integer __shift) noexcept 4056 { return __lhs = __lhs >> __shift; } 4057 4058template <class _Integer> 4059 constexpr typename enable_if<is_integral_v<_Integer>, byte>::type 4060 operator>> (byte __lhs, _Integer __shift) noexcept 4061 { return static_cast<byte>(static_cast<unsigned char>(static_cast<unsigned int>(__lhs) >> __shift)); } 4062 4063template <class _Integer> 4064 constexpr typename enable_if<is_integral_v<_Integer>, _Integer>::type 4065 to_integer(byte __b) noexcept { return static_cast<_Integer>(__b); } 4066 4067} 4068#endif 4069 4070#endif // _LIBCPP_TYPE_TRAITS 4071