1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_TYPE_TRAITS 11#define _LIBCPP_TYPE_TRAITS 12 13/* 14 type_traits synopsis 15 16namespace std 17{ 18 19 // helper class: 20 template <class T, T v> struct integral_constant; 21 typedef integral_constant<bool, true> true_type; // C++11 22 typedef integral_constant<bool, false> false_type; // C++11 23 24 template <bool B> // C++14 25 using bool_constant = integral_constant<bool, B>; // C++14 26 typedef bool_constant<true> true_type; // C++14 27 typedef bool_constant<false> false_type; // C++14 28 29 // helper traits 30 template <bool, class T = void> struct enable_if; 31 template <bool, class T, class F> struct conditional; 32 33 // Primary classification traits: 34 template <class T> struct is_void; 35 template <class T> struct is_null_pointer; // C++14 36 template <class T> struct is_integral; 37 template <class T> struct is_floating_point; 38 template <class T> struct is_array; 39 template <class T> struct is_pointer; 40 template <class T> struct is_lvalue_reference; 41 template <class T> struct is_rvalue_reference; 42 template <class T> struct is_member_object_pointer; 43 template <class T> struct is_member_function_pointer; 44 template <class T> struct is_enum; 45 template <class T> struct is_union; 46 template <class T> struct is_class; 47 template <class T> struct is_function; 48 49 // Secondary classification traits: 50 template <class T> struct is_reference; 51 template <class T> struct is_arithmetic; 52 template <class T> struct is_fundamental; 53 template <class T> struct is_member_pointer; 54 template <class T> struct is_scoped_enum; // C++2b 55 template <class T> struct is_scalar; 56 template <class T> struct is_object; 57 template <class T> struct is_compound; 58 59 // Const-volatile properties and transformations: 60 template <class T> struct is_const; 61 template <class T> struct is_volatile; 62 template <class T> struct remove_const; 63 template <class T> struct remove_volatile; 64 template <class T> struct remove_cv; 65 template <class T> struct add_const; 66 template <class T> struct add_volatile; 67 template <class T> struct add_cv; 68 69 // Reference transformations: 70 template <class T> struct remove_reference; 71 template <class T> struct add_lvalue_reference; 72 template <class T> struct add_rvalue_reference; 73 74 // Pointer transformations: 75 template <class T> struct remove_pointer; 76 template <class T> struct add_pointer; 77 78 template<class T> struct type_identity; // C++20 79 template<class T> 80 using type_identity_t = typename type_identity<T>::type; // C++20 81 82 // Integral properties: 83 template <class T> struct is_signed; 84 template <class T> struct is_unsigned; 85 template <class T> struct make_signed; 86 template <class T> struct make_unsigned; 87 88 // Array properties and transformations: 89 template <class T> struct rank; 90 template <class T, unsigned I = 0> struct extent; 91 template <class T> struct remove_extent; 92 template <class T> struct remove_all_extents; 93 94 template <class T> struct is_bounded_array; // C++20 95 template <class T> struct is_unbounded_array; // C++20 96 97 // Member introspection: 98 template <class T> struct is_pod; 99 template <class T> struct is_trivial; 100 template <class T> struct is_trivially_copyable; 101 template <class T> struct is_standard_layout; 102 template <class T> struct is_literal_type; // Deprecated in C++17; removed in C++20 103 template <class T> struct is_empty; 104 template <class T> struct is_polymorphic; 105 template <class T> struct is_abstract; 106 template <class T> struct is_final; // C++14 107 template <class T> struct is_aggregate; // C++17 108 109 template <class T, class... Args> struct is_constructible; 110 template <class T> struct is_default_constructible; 111 template <class T> struct is_copy_constructible; 112 template <class T> struct is_move_constructible; 113 template <class T, class U> struct is_assignable; 114 template <class T> struct is_copy_assignable; 115 template <class T> struct is_move_assignable; 116 template <class T, class U> struct is_swappable_with; // C++17 117 template <class T> struct is_swappable; // C++17 118 template <class T> struct is_destructible; 119 120 template <class T, class... Args> struct is_trivially_constructible; 121 template <class T> struct is_trivially_default_constructible; 122 template <class T> struct is_trivially_copy_constructible; 123 template <class T> struct is_trivially_move_constructible; 124 template <class T, class U> struct is_trivially_assignable; 125 template <class T> struct is_trivially_copy_assignable; 126 template <class T> struct is_trivially_move_assignable; 127 template <class T> struct is_trivially_destructible; 128 129 template <class T, class... Args> struct is_nothrow_constructible; 130 template <class T> struct is_nothrow_default_constructible; 131 template <class T> struct is_nothrow_copy_constructible; 132 template <class T> struct is_nothrow_move_constructible; 133 template <class T, class U> struct is_nothrow_assignable; 134 template <class T> struct is_nothrow_copy_assignable; 135 template <class T> struct is_nothrow_move_assignable; 136 template <class T, class U> struct is_nothrow_swappable_with; // C++17 137 template <class T> struct is_nothrow_swappable; // C++17 138 template <class T> struct is_nothrow_destructible; 139 140 template <class T> struct has_virtual_destructor; 141 142 template<class T> struct has_unique_object_representations; // C++17 143 144 // Relationships between types: 145 template <class T, class U> struct is_same; 146 template <class Base, class Derived> struct is_base_of; 147 148 template <class From, class To> struct is_convertible; 149 template <typename From, typename To> struct is_nothrow_convertible; // C++20 150 template <typename From, typename To> inline constexpr bool is_nothrow_convertible_v; // C++20 151 152 template <class Fn, class... ArgTypes> struct is_invocable; 153 template <class R, class Fn, class... ArgTypes> struct is_invocable_r; 154 155 template <class Fn, class... ArgTypes> struct is_nothrow_invocable; 156 template <class R, class Fn, class... ArgTypes> struct is_nothrow_invocable_r; 157 158 // Alignment properties and transformations: 159 template <class T> struct alignment_of; 160 template <size_t Len, size_t Align = most_stringent_alignment_requirement> 161 struct aligned_storage; 162 template <size_t Len, class... Types> struct aligned_union; 163 template <class T> struct remove_cvref; // C++20 164 165 template <class T> struct decay; 166 template <class... T> struct common_type; 167 template <class T> struct underlying_type; 168 template <class> class result_of; // undefined; deprecated in C++17; removed in C++20 169 template <class Fn, class... ArgTypes> class result_of<Fn(ArgTypes...)>; // deprecated in C++17; removed in C++20 170 template <class Fn, class... ArgTypes> struct invoke_result; // C++17 171 172 // const-volatile modifications: 173 template <class T> 174 using remove_const_t = typename remove_const<T>::type; // C++14 175 template <class T> 176 using remove_volatile_t = typename remove_volatile<T>::type; // C++14 177 template <class T> 178 using remove_cv_t = typename remove_cv<T>::type; // C++14 179 template <class T> 180 using add_const_t = typename add_const<T>::type; // C++14 181 template <class T> 182 using add_volatile_t = typename add_volatile<T>::type; // C++14 183 template <class T> 184 using add_cv_t = typename add_cv<T>::type; // C++14 185 186 // reference modifications: 187 template <class T> 188 using remove_reference_t = typename remove_reference<T>::type; // C++14 189 template <class T> 190 using add_lvalue_reference_t = typename add_lvalue_reference<T>::type; // C++14 191 template <class T> 192 using add_rvalue_reference_t = typename add_rvalue_reference<T>::type; // C++14 193 194 // sign modifications: 195 template <class T> 196 using make_signed_t = typename make_signed<T>::type; // C++14 197 template <class T> 198 using make_unsigned_t = typename make_unsigned<T>::type; // C++14 199 200 // array modifications: 201 template <class T> 202 using remove_extent_t = typename remove_extent<T>::type; // C++14 203 template <class T> 204 using remove_all_extents_t = typename remove_all_extents<T>::type; // C++14 205 206 template <class T> 207 inline constexpr bool is_bounded_array_v 208 = is_bounded_array<T>::value; // C++20 209 inline constexpr bool is_unbounded_array_v 210 = is_unbounded_array<T>::value; // C++20 211 212 // pointer modifications: 213 template <class T> 214 using remove_pointer_t = typename remove_pointer<T>::type; // C++14 215 template <class T> 216 using add_pointer_t = typename add_pointer<T>::type; // C++14 217 218 // other transformations: 219 template <size_t Len, size_t Align=default-alignment> 220 using aligned_storage_t = typename aligned_storage<Len,Align>::type; // C++14 221 template <size_t Len, class... Types> 222 using aligned_union_t = typename aligned_union<Len,Types...>::type; // C++14 223 template <class T> 224 using remove_cvref_t = typename remove_cvref<T>::type; // C++20 225 template <class T> 226 using decay_t = typename decay<T>::type; // C++14 227 template <bool b, class T=void> 228 using enable_if_t = typename enable_if<b,T>::type; // C++14 229 template <bool b, class T, class F> 230 using conditional_t = typename conditional<b,T,F>::type; // C++14 231 template <class... T> 232 using common_type_t = typename common_type<T...>::type; // C++14 233 template <class T> 234 using underlying_type_t = typename underlying_type<T>::type; // C++14 235 template <class T> 236 using result_of_t = typename result_of<T>::type; // C++14; deprecated in C++17; removed in C++20 237 template <class Fn, class... ArgTypes> 238 using invoke_result_t = typename invoke_result<Fn, ArgTypes...>::type; // C++17 239 240 template <class...> 241 using void_t = void; // C++17 242 243 // See C++14 20.10.4.1, primary type categories 244 template <class T> inline constexpr bool is_void_v 245 = is_void<T>::value; // C++17 246 template <class T> inline constexpr bool is_null_pointer_v 247 = is_null_pointer<T>::value; // C++17 248 template <class T> inline constexpr bool is_integral_v 249 = is_integral<T>::value; // C++17 250 template <class T> inline constexpr bool is_floating_point_v 251 = is_floating_point<T>::value; // C++17 252 template <class T> inline constexpr bool is_array_v 253 = is_array<T>::value; // C++17 254 template <class T> inline constexpr bool is_pointer_v 255 = is_pointer<T>::value; // C++17 256 template <class T> inline constexpr bool is_lvalue_reference_v 257 = is_lvalue_reference<T>::value; // C++17 258 template <class T> inline constexpr bool is_rvalue_reference_v 259 = is_rvalue_reference<T>::value; // C++17 260 template <class T> inline constexpr bool is_member_object_pointer_v 261 = is_member_object_pointer<T>::value; // C++17 262 template <class T> inline constexpr bool is_member_function_pointer_v 263 = is_member_function_pointer<T>::value; // C++17 264 template <class T> inline constexpr bool is_enum_v 265 = is_enum<T>::value; // C++17 266 template <class T> inline constexpr bool is_union_v 267 = is_union<T>::value; // C++17 268 template <class T> inline constexpr bool is_class_v 269 = is_class<T>::value; // C++17 270 template <class T> inline constexpr bool is_function_v 271 = is_function<T>::value; // C++17 272 273 // See C++14 20.10.4.2, composite type categories 274 template <class T> inline constexpr bool is_reference_v 275 = is_reference<T>::value; // C++17 276 template <class T> inline constexpr bool is_arithmetic_v 277 = is_arithmetic<T>::value; // C++17 278 template <class T> inline constexpr bool is_fundamental_v 279 = is_fundamental<T>::value; // C++17 280 template <class T> inline constexpr bool is_object_v 281 = is_object<T>::value; // C++17 282 template <class T> inline constexpr bool is_scalar_v 283 = is_scalar<T>::value; // C++17 284 template <class T> inline constexpr bool is_compound_v 285 = is_compound<T>::value; // C++17 286 template <class T> inline constexpr bool is_member_pointer_v 287 = is_member_pointer<T>::value; // C++17 288 template <class T> inline constexpr bool is_scoped_enum_v 289 = is_scoped_enum<T>::value; // C++2b 290 291 // See C++14 20.10.4.3, type properties 292 template <class T> inline constexpr bool is_const_v 293 = is_const<T>::value; // C++17 294 template <class T> inline constexpr bool is_volatile_v 295 = is_volatile<T>::value; // C++17 296 template <class T> inline constexpr bool is_trivial_v 297 = is_trivial<T>::value; // C++17 298 template <class T> inline constexpr bool is_trivially_copyable_v 299 = is_trivially_copyable<T>::value; // C++17 300 template <class T> inline constexpr bool is_standard_layout_v 301 = is_standard_layout<T>::value; // C++17 302 template <class T> inline constexpr bool is_pod_v 303 = is_pod<T>::value; // C++17 304 template <class T> inline constexpr bool is_literal_type_v 305 = is_literal_type<T>::value; // C++17; deprecated in C++17; removed in C++20 306 template <class T> inline constexpr bool is_empty_v 307 = is_empty<T>::value; // C++17 308 template <class T> inline constexpr bool is_polymorphic_v 309 = is_polymorphic<T>::value; // C++17 310 template <class T> inline constexpr bool is_abstract_v 311 = is_abstract<T>::value; // C++17 312 template <class T> inline constexpr bool is_final_v 313 = is_final<T>::value; // C++17 314 template <class T> inline constexpr bool is_aggregate_v 315 = is_aggregate<T>::value; // C++17 316 template <class T> inline constexpr bool is_signed_v 317 = is_signed<T>::value; // C++17 318 template <class T> inline constexpr bool is_unsigned_v 319 = is_unsigned<T>::value; // C++17 320 template <class T, class... Args> inline constexpr bool is_constructible_v 321 = is_constructible<T, Args...>::value; // C++17 322 template <class T> inline constexpr bool is_default_constructible_v 323 = is_default_constructible<T>::value; // C++17 324 template <class T> inline constexpr bool is_copy_constructible_v 325 = is_copy_constructible<T>::value; // C++17 326 template <class T> inline constexpr bool is_move_constructible_v 327 = is_move_constructible<T>::value; // C++17 328 template <class T, class U> inline constexpr bool is_assignable_v 329 = is_assignable<T, U>::value; // C++17 330 template <class T> inline constexpr bool is_copy_assignable_v 331 = is_copy_assignable<T>::value; // C++17 332 template <class T> inline constexpr bool is_move_assignable_v 333 = is_move_assignable<T>::value; // C++17 334 template <class T, class U> inline constexpr bool is_swappable_with_v 335 = is_swappable_with<T, U>::value; // C++17 336 template <class T> inline constexpr bool is_swappable_v 337 = is_swappable<T>::value; // C++17 338 template <class T> inline constexpr bool is_destructible_v 339 = is_destructible<T>::value; // C++17 340 template <class T, class... Args> inline constexpr bool is_trivially_constructible_v 341 = is_trivially_constructible<T, Args...>::value; // C++17 342 template <class T> inline constexpr bool is_trivially_default_constructible_v 343 = is_trivially_default_constructible<T>::value; // C++17 344 template <class T> inline constexpr bool is_trivially_copy_constructible_v 345 = is_trivially_copy_constructible<T>::value; // C++17 346 template <class T> inline constexpr bool is_trivially_move_constructible_v 347 = is_trivially_move_constructible<T>::value; // C++17 348 template <class T, class U> inline constexpr bool is_trivially_assignable_v 349 = is_trivially_assignable<T, U>::value; // C++17 350 template <class T> inline constexpr bool is_trivially_copy_assignable_v 351 = is_trivially_copy_assignable<T>::value; // C++17 352 template <class T> inline constexpr bool is_trivially_move_assignable_v 353 = is_trivially_move_assignable<T>::value; // C++17 354 template <class T> inline constexpr bool is_trivially_destructible_v 355 = is_trivially_destructible<T>::value; // C++17 356 template <class T, class... Args> inline constexpr bool is_nothrow_constructible_v 357 = is_nothrow_constructible<T, Args...>::value; // C++17 358 template <class T> inline constexpr bool is_nothrow_default_constructible_v 359 = is_nothrow_default_constructible<T>::value; // C++17 360 template <class T> inline constexpr bool is_nothrow_copy_constructible_v 361 = is_nothrow_copy_constructible<T>::value; // C++17 362 template <class T> inline constexpr bool is_nothrow_move_constructible_v 363 = is_nothrow_move_constructible<T>::value; // C++17 364 template <class T, class U> inline constexpr bool is_nothrow_assignable_v 365 = is_nothrow_assignable<T, U>::value; // C++17 366 template <class T> inline constexpr bool is_nothrow_copy_assignable_v 367 = is_nothrow_copy_assignable<T>::value; // C++17 368 template <class T> inline constexpr bool is_nothrow_move_assignable_v 369 = is_nothrow_move_assignable<T>::value; // C++17 370 template <class T, class U> inline constexpr bool is_nothrow_swappable_with_v 371 = is_nothrow_swappable_with<T, U>::value; // C++17 372 template <class T> inline constexpr bool is_nothrow_swappable_v 373 = is_nothrow_swappable<T>::value; // C++17 374 template <class T> inline constexpr bool is_nothrow_destructible_v 375 = is_nothrow_destructible<T>::value; // C++17 376 template <class T> inline constexpr bool has_virtual_destructor_v 377 = has_virtual_destructor<T>::value; // C++17 378 template<class T> inline constexpr bool has_unique_object_representations_v // C++17 379 = has_unique_object_representations<T>::value; 380 381 // See C++14 20.10.5, type property queries 382 template <class T> inline constexpr size_t alignment_of_v 383 = alignment_of<T>::value; // C++17 384 template <class T> inline constexpr size_t rank_v 385 = rank<T>::value; // C++17 386 template <class T, unsigned I = 0> inline constexpr size_t extent_v 387 = extent<T, I>::value; // C++17 388 389 // See C++14 20.10.6, type relations 390 template <class T, class U> inline constexpr bool is_same_v 391 = is_same<T, U>::value; // C++17 392 template <class Base, class Derived> inline constexpr bool is_base_of_v 393 = is_base_of<Base, Derived>::value; // C++17 394 template <class From, class To> inline constexpr bool is_convertible_v 395 = is_convertible<From, To>::value; // C++17 396 template <class Fn, class... ArgTypes> inline constexpr bool is_invocable_v 397 = is_invocable<Fn, ArgTypes...>::value; // C++17 398 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_invocable_r_v 399 = is_invocable_r<R, Fn, ArgTypes...>::value; // C++17 400 template <class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_v 401 = is_nothrow_invocable<Fn, ArgTypes...>::value; // C++17 402 template <class R, class Fn, class... ArgTypes> inline constexpr bool is_nothrow_invocable_r_v 403 = is_nothrow_invocable_r<R, Fn, ArgTypes...>::value; // C++17 404 405 // [meta.logical], logical operator traits: 406 template<class... B> struct conjunction; // C++17 407 template<class... B> 408 inline constexpr bool conjunction_v = conjunction<B...>::value; // C++17 409 template<class... B> struct disjunction; // C++17 410 template<class... B> 411 inline constexpr bool disjunction_v = disjunction<B...>::value; // C++17 412 template<class B> struct negation; // C++17 413 template<class B> 414 inline constexpr bool negation_v = negation<B>::value; // C++17 415 416} 417 418*/ 419 420#include <__assert> // all public C++ headers provide the assertion handler 421#include <__config> 422#include <__type_traits/integral_constant.h> 423#include <__type_traits/is_callable.h> 424#include <__utility/declval.h> 425#include <cstddef> 426#include <version> 427 428#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 429# pragma GCC system_header 430#endif 431 432_LIBCPP_BEGIN_NAMESPACE_STD 433 434template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 435template <class _Tp> class _LIBCPP_TEMPLATE_VIS reference_wrapper; 436template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 437 438template <bool, class _Tp = void> struct _LIBCPP_TEMPLATE_VIS enable_if {}; 439template <class _Tp> struct _LIBCPP_TEMPLATE_VIS enable_if<true, _Tp> {typedef _Tp type;}; 440 441template <bool _Bp, class _Tp = void> using __enable_if_t _LIBCPP_NODEBUG = typename enable_if<_Bp, _Tp>::type; 442 443#if _LIBCPP_STD_VER > 11 444template <bool _Bp, class _Tp = void> using enable_if_t = typename enable_if<_Bp, _Tp>::type; 445#endif 446 447template <bool> struct _MetaBase; 448template <> 449struct _MetaBase<true> { 450 template <class _Tp, class _Up> 451 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 452 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 453 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 454 template <class _First, class...> 455 using _FirstImpl _LIBCPP_NODEBUG = _First; 456 template <class, class _Second, class...> 457 using _SecondImpl _LIBCPP_NODEBUG = _Second; 458 template <class _Result, class _First, class ..._Rest> 459 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 460}; 461 462template <> 463struct _MetaBase<false> { 464 template <class _Tp, class _Up> 465 using _SelectImpl _LIBCPP_NODEBUG = _Up; 466 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 467 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 468 template <class _Result, class ...> 469 using _OrImpl _LIBCPP_NODEBUG = _Result; 470}; 471template <bool _Cond, class _IfRes, class _ElseRes> 472using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 473template <class ..._Rest> 474using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 475template <class _Pred> 476struct _Not : _BoolConstant<!_Pred::value> {}; 477template <class ..._Args> 478using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 479template <class ..._Args> 480using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 481 482template <class ...> using __expand_to_true = true_type; 483template <class ..._Pred> 484__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); 485template <class ...> 486false_type __and_helper(...); 487template <class ..._Pred> 488using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 489 490template <template <class...> class _Func, class ..._Args> 491struct _Lazy : _Func<_Args...> {}; 492 493// Member detector base 494 495template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 496true_type __sfinae_test_impl(int); 497template <template <class...> class, class ...> 498false_type __sfinae_test_impl(...); 499 500template <template <class ...> class _Templ, class ..._Args> 501using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 502 503template <class> 504struct __void_t { typedef void type; }; 505 506template <class _Tp, bool> 507struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 508 509 510template <bool _Bp, class _If, class _Then> 511 struct _LIBCPP_TEMPLATE_VIS conditional {typedef _If type;}; 512template <class _If, class _Then> 513 struct _LIBCPP_TEMPLATE_VIS conditional<false, _If, _Then> {typedef _Then type;}; 514 515#if _LIBCPP_STD_VER > 11 516template <bool _Bp, class _If, class _Then> using conditional_t = typename conditional<_Bp, _If, _Then>::type; 517#endif 518 519// is_same 520 521template <class _Tp, class _Up> 522struct _LIBCPP_TEMPLATE_VIS is_same : _BoolConstant<__is_same(_Tp, _Up)> { }; 523 524#if _LIBCPP_STD_VER > 14 525template <class _Tp, class _Up> 526inline constexpr bool is_same_v = __is_same(_Tp, _Up); 527#endif 528 529// _IsSame<T,U> has the same effect as is_same<T,U> but instantiates fewer types: 530// is_same<A,B> and is_same<C,D> are guaranteed to be different types, but 531// _IsSame<A,B> and _IsSame<C,D> are the same type (namely, false_type). 532// Neither GCC nor Clang can mangle the __is_same builtin, so _IsSame 533// mustn't be directly used anywhere that contributes to name-mangling 534// (such as in a dependent return type). 535 536template <class _Tp, class _Up> 537using _IsSame = _BoolConstant<__is_same(_Tp, _Up)>; 538 539template <class _Tp, class _Up> 540using _IsNotSame = _BoolConstant<!__is_same(_Tp, _Up)>; 541 542template <class _Tp> 543using __test_for_primary_template = __enable_if_t< 544 _IsSame<_Tp, typename _Tp::__primary_template>::value 545 >; 546template <class _Tp> 547using __is_primary_template = _IsValidExpansion< 548 __test_for_primary_template, _Tp 549 >; 550 551// helper class 552 553struct __two {char __lx[2];}; 554 555// is_const 556 557#if __has_keyword(__is_const) 558 559template <class _Tp> 560struct _LIBCPP_TEMPLATE_VIS is_const : _BoolConstant<__is_const(_Tp)> { }; 561 562#if _LIBCPP_STD_VER > 14 563template <class _Tp> 564inline constexpr bool is_const_v = __is_const(_Tp); 565#endif 566 567#else 568 569template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const : public false_type {}; 570template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_const<_Tp const> : public true_type {}; 571 572#if _LIBCPP_STD_VER > 14 573template <class _Tp> 574inline constexpr bool is_const_v = is_const<_Tp>::value; 575#endif 576 577#endif // __has_keyword(__is_const) 578 579// is_volatile 580 581#if __has_keyword(__is_volatile) 582 583template <class _Tp> 584struct _LIBCPP_TEMPLATE_VIS is_volatile : _BoolConstant<__is_volatile(_Tp)> { }; 585 586#if _LIBCPP_STD_VER > 14 587template <class _Tp> 588inline constexpr bool is_volatile_v = __is_volatile(_Tp); 589#endif 590 591#else 592 593template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile : public false_type {}; 594template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_volatile<_Tp volatile> : public true_type {}; 595 596#if _LIBCPP_STD_VER > 14 597template <class _Tp> 598inline constexpr bool is_volatile_v = is_volatile<_Tp>::value; 599#endif 600 601#endif // __has_keyword(__is_volatile) 602 603// remove_const 604 605template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const {typedef _Tp type;}; 606template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_const<const _Tp> {typedef _Tp type;}; 607#if _LIBCPP_STD_VER > 11 608template <class _Tp> using remove_const_t = typename remove_const<_Tp>::type; 609#endif 610 611// remove_volatile 612 613template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile {typedef _Tp type;}; 614template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_volatile<volatile _Tp> {typedef _Tp type;}; 615#if _LIBCPP_STD_VER > 11 616template <class _Tp> using remove_volatile_t = typename remove_volatile<_Tp>::type; 617#endif 618 619// remove_cv 620 621template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_cv 622{typedef typename remove_volatile<typename remove_const<_Tp>::type>::type type;}; 623#if _LIBCPP_STD_VER > 11 624template <class _Tp> using remove_cv_t = typename remove_cv<_Tp>::type; 625#endif 626 627// is_void 628 629#if __has_keyword(__is_void) 630 631template <class _Tp> 632struct _LIBCPP_TEMPLATE_VIS is_void : _BoolConstant<__is_void(_Tp)> { }; 633 634#if _LIBCPP_STD_VER > 14 635template <class _Tp> 636inline constexpr bool is_void_v = __is_void(_Tp); 637#endif 638 639#else 640 641template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_void 642 : public is_same<typename remove_cv<_Tp>::type, void> {}; 643 644#if _LIBCPP_STD_VER > 14 645template <class _Tp> 646inline constexpr bool is_void_v = is_void<_Tp>::value; 647#endif 648 649#endif // __has_keyword(__is_void) 650 651// __is_nullptr_t 652 653template <class _Tp> struct __is_nullptr_t_impl : public false_type {}; 654template <> struct __is_nullptr_t_impl<nullptr_t> : public true_type {}; 655 656template <class _Tp> struct _LIBCPP_TEMPLATE_VIS __is_nullptr_t 657 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 658 659#if _LIBCPP_STD_VER > 11 660template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_null_pointer 661 : public __is_nullptr_t_impl<typename remove_cv<_Tp>::type> {}; 662 663#if _LIBCPP_STD_VER > 14 664template <class _Tp> 665inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value; 666#endif 667#endif // _LIBCPP_STD_VER > 11 668 669// is_integral 670 671#if __has_keyword(__is_integral) 672 673template <class _Tp> 674struct _LIBCPP_TEMPLATE_VIS is_integral : _BoolConstant<__is_integral(_Tp)> { }; 675 676#if _LIBCPP_STD_VER > 14 677template <class _Tp> 678inline constexpr bool is_integral_v = __is_integral(_Tp); 679#endif 680 681#else 682 683template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_integral 684 : public _BoolConstant<__libcpp_is_integral<typename remove_cv<_Tp>::type>::value> {}; 685 686#if _LIBCPP_STD_VER > 14 687template <class _Tp> 688inline constexpr bool is_integral_v = is_integral<_Tp>::value; 689#endif 690 691#endif // __has_keyword(__is_integral) 692 693// [basic.fundamental] defines five standard signed integer types; 694// __int128_t is an extended signed integer type. 695// The signed and unsigned integer types, plus bool and the 696// five types with "char" in their name, compose the "integral" types. 697 698template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 699template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 700template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 701template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 702template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 703template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 704#ifndef _LIBCPP_HAS_NO_INT128 705template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 706#endif 707 708template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 709template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 710template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 711template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 712template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 713template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 714#ifndef _LIBCPP_HAS_NO_INT128 715template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 716#endif 717 718// is_floating_point 719// <concepts> implements __libcpp_floating_point 720 721template <class _Tp> struct __libcpp_is_floating_point : public false_type {}; 722template <> struct __libcpp_is_floating_point<float> : public true_type {}; 723template <> struct __libcpp_is_floating_point<double> : public true_type {}; 724template <> struct __libcpp_is_floating_point<long double> : public true_type {}; 725 726template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_floating_point 727 : public __libcpp_is_floating_point<typename remove_cv<_Tp>::type> {}; 728 729#if _LIBCPP_STD_VER > 14 730template <class _Tp> 731inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value; 732#endif 733 734// is_array 735 736// TODO: Clang incorrectly reports that __is_array is true for T[0]. 737// Re-enable the branch once https://llvm.org/PR54705 is fixed. 738#if __has_keyword(__is_array) && 0 739 740template <class _Tp> 741struct _LIBCPP_TEMPLATE_VIS is_array : _BoolConstant<__is_array(_Tp)> { }; 742 743#if _LIBCPP_STD_VER > 14 744template <class _Tp> 745inline constexpr bool is_array_v = __is_array(_Tp); 746#endif 747 748#else 749 750template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array 751 : public false_type {}; 752template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[]> 753 : public true_type {}; 754template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_array<_Tp[_Np]> 755 : public true_type {}; 756 757#if _LIBCPP_STD_VER > 14 758template <class _Tp> 759inline constexpr bool is_array_v = is_array<_Tp>::value; 760#endif 761 762#endif // __has_keyword(__is_array) 763 764// is_pointer 765 766// Before AppleClang 12.0.5, __is_pointer didn't work for Objective-C types. 767#if __has_keyword(__is_pointer) && \ 768 !(defined(_LIBCPP_APPLE_CLANG_VER) && _LIBCPP_APPLE_CLANG_VER < 1205) 769 770template<class _Tp> 771struct _LIBCPP_TEMPLATE_VIS is_pointer : _BoolConstant<__is_pointer(_Tp)> { }; 772 773#if _LIBCPP_STD_VER > 14 774template <class _Tp> 775inline constexpr bool is_pointer_v = __is_pointer(_Tp); 776#endif 777 778#else // __has_keyword(__is_pointer) 779 780template <class _Tp> struct __libcpp_is_pointer : public false_type {}; 781template <class _Tp> struct __libcpp_is_pointer<_Tp*> : public true_type {}; 782 783template <class _Tp> struct __libcpp_remove_objc_qualifiers { typedef _Tp type; }; 784#if defined(_LIBCPP_HAS_OBJC_ARC) 785template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __strong> { typedef _Tp type; }; 786template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __weak> { typedef _Tp type; }; 787template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __autoreleasing> { typedef _Tp type; }; 788template <class _Tp> struct __libcpp_remove_objc_qualifiers<_Tp __unsafe_unretained> { typedef _Tp type; }; 789#endif 790 791template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pointer 792 : public __libcpp_is_pointer<typename __libcpp_remove_objc_qualifiers<typename remove_cv<_Tp>::type>::type> {}; 793 794#if _LIBCPP_STD_VER > 14 795template <class _Tp> 796inline constexpr bool is_pointer_v = is_pointer<_Tp>::value; 797#endif 798 799#endif // __has_keyword(__is_pointer) 800 801// is_reference 802 803#if __has_keyword(__is_lvalue_reference) && \ 804 __has_keyword(__is_rvalue_reference) && \ 805 __has_keyword(__is_reference) 806 807template<class _Tp> 808struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : _BoolConstant<__is_lvalue_reference(_Tp)> { }; 809 810template<class _Tp> 811struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : _BoolConstant<__is_rvalue_reference(_Tp)> { }; 812 813template<class _Tp> 814struct _LIBCPP_TEMPLATE_VIS is_reference : _BoolConstant<__is_reference(_Tp)> { }; 815 816#if _LIBCPP_STD_VER > 14 817template <class _Tp> 818inline constexpr bool is_reference_v = __is_reference(_Tp); 819template <class _Tp> 820inline constexpr bool is_lvalue_reference_v = __is_lvalue_reference(_Tp); 821template <class _Tp> 822inline constexpr bool is_rvalue_reference_v = __is_rvalue_reference(_Tp); 823#endif 824 825#else // __has_keyword(__is_lvalue_reference) && etc... 826 827template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference : public false_type {}; 828template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_lvalue_reference<_Tp&> : public true_type {}; 829 830template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference : public false_type {}; 831template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_rvalue_reference<_Tp&&> : public true_type {}; 832 833template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference : public false_type {}; 834template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&> : public true_type {}; 835template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_reference<_Tp&&> : public true_type {}; 836 837#if _LIBCPP_STD_VER > 14 838template <class _Tp> 839inline constexpr bool is_reference_v = is_reference<_Tp>::value; 840 841template <class _Tp> 842inline constexpr bool is_lvalue_reference_v = is_lvalue_reference<_Tp>::value; 843 844template <class _Tp> 845inline constexpr bool is_rvalue_reference_v = is_rvalue_reference<_Tp>::value; 846#endif 847 848#endif // __has_keyword(__is_lvalue_reference) && etc... 849 850// is_union 851 852#if __has_feature(is_union) || defined(_LIBCPP_COMPILER_GCC) 853 854template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 855 : public integral_constant<bool, __is_union(_Tp)> {}; 856 857#else 858 859template <class _Tp> struct __libcpp_union : public false_type {}; 860template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_union 861 : public __libcpp_union<typename remove_cv<_Tp>::type> {}; 862 863#endif 864 865#if _LIBCPP_STD_VER > 14 866template <class _Tp> 867inline constexpr bool is_union_v = is_union<_Tp>::value; 868#endif 869 870// is_class 871 872#if __has_feature(is_class) || defined(_LIBCPP_COMPILER_GCC) 873 874template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 875 : public integral_constant<bool, __is_class(_Tp)> {}; 876 877#else 878 879namespace __is_class_imp 880{ 881template <class _Tp> char __test(int _Tp::*); 882template <class _Tp> __two __test(...); 883} 884 885template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_class 886 : public integral_constant<bool, sizeof(__is_class_imp::__test<_Tp>(0)) == 1 && !is_union<_Tp>::value> {}; 887 888#endif 889 890#if _LIBCPP_STD_VER > 14 891template <class _Tp> 892inline constexpr bool is_class_v = is_class<_Tp>::value; 893#endif 894 895// is_function 896 897template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_function 898 : public _BoolConstant< 899#ifdef __clang__ 900 __is_function(_Tp) 901#else 902 !(is_reference<_Tp>::value || is_const<const _Tp>::value) 903#endif 904 > {}; 905 906 907#if _LIBCPP_STD_VER > 14 908template <class _Tp> 909inline constexpr bool is_function_v = is_function<_Tp>::value; 910#endif 911 912template <class _Tp> struct __libcpp_is_member_pointer { 913 enum { 914 __is_member = false, 915 __is_func = false, 916 __is_obj = false 917 }; 918}; 919template <class _Tp, class _Up> struct __libcpp_is_member_pointer<_Tp _Up::*> { 920 enum { 921 __is_member = true, 922 __is_func = is_function<_Tp>::value, 923 __is_obj = !__is_func, 924 }; 925}; 926 927#if __has_keyword(__is_member_function_pointer) 928 929template<class _Tp> 930struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 931 : _BoolConstant<__is_member_function_pointer(_Tp)> { }; 932 933#if _LIBCPP_STD_VER > 14 934template <class _Tp> 935inline constexpr bool is_member_function_pointer_v = __is_member_function_pointer(_Tp); 936#endif 937 938#else // __has_keyword(__is_member_function_pointer) 939 940template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_function_pointer 941 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_func > {}; 942 943#if _LIBCPP_STD_VER > 14 944template <class _Tp> 945inline constexpr bool is_member_function_pointer_v = is_member_function_pointer<_Tp>::value; 946#endif 947 948#endif // __has_keyword(__is_member_function_pointer) 949 950// is_member_pointer 951 952#if __has_keyword(__is_member_pointer) 953 954template<class _Tp> 955struct _LIBCPP_TEMPLATE_VIS is_member_pointer : _BoolConstant<__is_member_pointer(_Tp)> { }; 956 957#if _LIBCPP_STD_VER > 14 958template <class _Tp> 959inline constexpr bool is_member_pointer_v = __is_member_pointer(_Tp); 960#endif 961 962#else // __has_keyword(__is_member_pointer) 963 964template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_pointer 965 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_member > {}; 966 967#if _LIBCPP_STD_VER > 14 968template <class _Tp> 969inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value; 970#endif 971 972#endif // __has_keyword(__is_member_pointer) 973 974// is_member_object_pointer 975 976#if __has_keyword(__is_member_object_pointer) 977 978template<class _Tp> 979struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 980 : _BoolConstant<__is_member_object_pointer(_Tp)> { }; 981 982#if _LIBCPP_STD_VER > 14 983template <class _Tp> 984inline constexpr bool is_member_object_pointer_v = __is_member_object_pointer(_Tp); 985#endif 986 987#else // __has_keyword(__is_member_object_pointer) 988 989template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_member_object_pointer 990 : public _BoolConstant< __libcpp_is_member_pointer<typename remove_cv<_Tp>::type>::__is_obj > {}; 991 992#if _LIBCPP_STD_VER > 14 993template <class _Tp> 994inline constexpr bool is_member_object_pointer_v = is_member_object_pointer<_Tp>::value; 995#endif 996 997#endif // __has_keyword(__is_member_object_pointer) 998 999// is_enum 1000 1001#if __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1002 1003template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1004 : public integral_constant<bool, __is_enum(_Tp)> {}; 1005 1006#if _LIBCPP_STD_VER > 14 1007template <class _Tp> 1008inline constexpr bool is_enum_v = __is_enum(_Tp); 1009#endif 1010 1011#else 1012 1013template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_enum 1014 : public integral_constant<bool, !is_void<_Tp>::value && 1015 !is_integral<_Tp>::value && 1016 !is_floating_point<_Tp>::value && 1017 !is_array<_Tp>::value && 1018 !is_pointer<_Tp>::value && 1019 !is_reference<_Tp>::value && 1020 !is_member_pointer<_Tp>::value && 1021 !is_union<_Tp>::value && 1022 !is_class<_Tp>::value && 1023 !is_function<_Tp>::value > {}; 1024 1025#if _LIBCPP_STD_VER > 14 1026template <class _Tp> 1027inline constexpr bool is_enum_v = is_enum<_Tp>::value; 1028#endif 1029 1030#endif // __has_feature(is_enum) || defined(_LIBCPP_COMPILER_GCC) 1031 1032// is_arithmetic 1033 1034 1035template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_arithmetic 1036 : public integral_constant<bool, is_integral<_Tp>::value || 1037 is_floating_point<_Tp>::value> {}; 1038 1039#if _LIBCPP_STD_VER > 14 1040template <class _Tp> 1041inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value; 1042#endif 1043 1044// is_fundamental 1045 1046// Before Clang 10, __is_fundamental didn't work for nullptr_t. 1047// In C++03 nullptr_t is library-provided but must still count as "fundamental." 1048#if __has_keyword(__is_fundamental) && \ 1049 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1000) && \ 1050 !defined(_LIBCPP_CXX03_LANG) 1051 1052template<class _Tp> 1053struct _LIBCPP_TEMPLATE_VIS is_fundamental : _BoolConstant<__is_fundamental(_Tp)> { }; 1054 1055#if _LIBCPP_STD_VER > 14 1056template <class _Tp> 1057inline constexpr bool is_fundamental_v = __is_fundamental(_Tp); 1058#endif 1059 1060#else // __has_keyword(__is_fundamental) 1061 1062template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_fundamental 1063 : public integral_constant<bool, is_void<_Tp>::value || 1064 __is_nullptr_t<_Tp>::value || 1065 is_arithmetic<_Tp>::value> {}; 1066 1067#if _LIBCPP_STD_VER > 14 1068template <class _Tp> 1069inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value; 1070#endif 1071 1072#endif // __has_keyword(__is_fundamental) 1073 1074// is_scalar 1075 1076// In C++03 nullptr_t is library-provided but must still count as "scalar." 1077#if __has_keyword(__is_scalar) && !defined(_LIBCPP_CXX03_LANG) 1078 1079template<class _Tp> 1080struct _LIBCPP_TEMPLATE_VIS is_scalar : _BoolConstant<__is_scalar(_Tp)> { }; 1081 1082#if _LIBCPP_STD_VER > 14 1083template <class _Tp> 1084inline constexpr bool is_scalar_v = __is_scalar(_Tp); 1085#endif 1086 1087#else // __has_keyword(__is_scalar) 1088 1089template <class _Tp> struct __is_block : false_type {}; 1090#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) 1091template <class _Rp, class ..._Args> struct __is_block<_Rp (^)(_Args...)> : true_type {}; 1092#endif 1093 1094template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_scalar 1095 : public integral_constant<bool, is_arithmetic<_Tp>::value || 1096 is_member_pointer<_Tp>::value || 1097 is_pointer<_Tp>::value || 1098 __is_nullptr_t<_Tp>::value || 1099 __is_block<_Tp>::value || 1100 is_enum<_Tp>::value > {}; 1101 1102template <> struct _LIBCPP_TEMPLATE_VIS is_scalar<nullptr_t> : public true_type {}; 1103 1104#if _LIBCPP_STD_VER > 14 1105template <class _Tp> 1106inline constexpr bool is_scalar_v = is_scalar<_Tp>::value; 1107#endif 1108 1109#endif // __has_keyword(__is_scalar) 1110 1111// is_object 1112 1113#if __has_keyword(__is_object) 1114 1115template<class _Tp> 1116struct _LIBCPP_TEMPLATE_VIS is_object : _BoolConstant<__is_object(_Tp)> { }; 1117 1118#if _LIBCPP_STD_VER > 14 1119template <class _Tp> 1120inline constexpr bool is_object_v = __is_object(_Tp); 1121#endif 1122 1123#else // __has_keyword(__is_object) 1124 1125template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_object 1126 : public integral_constant<bool, is_scalar<_Tp>::value || 1127 is_array<_Tp>::value || 1128 is_union<_Tp>::value || 1129 is_class<_Tp>::value > {}; 1130 1131#if _LIBCPP_STD_VER > 14 1132template <class _Tp> 1133inline constexpr bool is_object_v = is_object<_Tp>::value; 1134#endif 1135 1136#endif // __has_keyword(__is_object) 1137 1138// is_compound 1139 1140// >= 11 because in C++03 nullptr isn't actually nullptr 1141#if __has_keyword(__is_compound) && !defined(_LIBCPP_CXX03_LANG) 1142 1143template<class _Tp> 1144struct _LIBCPP_TEMPLATE_VIS is_compound : _BoolConstant<__is_compound(_Tp)> { }; 1145 1146#if _LIBCPP_STD_VER > 14 1147template <class _Tp> 1148inline constexpr bool is_compound_v = __is_compound(_Tp); 1149#endif 1150 1151#else // __has_keyword(__is_compound) 1152 1153template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_compound 1154 : public integral_constant<bool, !is_fundamental<_Tp>::value> {}; 1155 1156#if _LIBCPP_STD_VER > 14 1157template <class _Tp> 1158inline constexpr bool is_compound_v = is_compound<_Tp>::value; 1159#endif 1160 1161#endif // __has_keyword(__is_compound) 1162 1163// __is_referenceable [defns.referenceable] 1164 1165struct __is_referenceable_impl { 1166 template <class _Tp> static _Tp& __test(int); 1167 template <class _Tp> static __two __test(...); 1168}; 1169 1170template <class _Tp> 1171struct __is_referenceable : integral_constant<bool, 1172 _IsNotSame<decltype(__is_referenceable_impl::__test<_Tp>(0)), __two>::value> {}; 1173 1174 1175// add_const 1176 1177template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_const { 1178 typedef _LIBCPP_NODEBUG const _Tp type; 1179}; 1180 1181#if _LIBCPP_STD_VER > 11 1182template <class _Tp> using add_const_t = typename add_const<_Tp>::type; 1183#endif 1184 1185// add_volatile 1186 1187template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_volatile { 1188 typedef _LIBCPP_NODEBUG volatile _Tp type; 1189}; 1190 1191#if _LIBCPP_STD_VER > 11 1192template <class _Tp> using add_volatile_t = typename add_volatile<_Tp>::type; 1193#endif 1194 1195// add_cv 1196template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_cv { 1197 typedef _LIBCPP_NODEBUG const volatile _Tp type; 1198}; 1199 1200#if _LIBCPP_STD_VER > 11 1201template <class _Tp> using add_cv_t = typename add_cv<_Tp>::type; 1202#endif 1203 1204// remove_reference 1205 1206template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference {typedef _LIBCPP_NODEBUG _Tp type;}; 1207template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&> {typedef _LIBCPP_NODEBUG _Tp type;}; 1208template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_reference<_Tp&&> {typedef _LIBCPP_NODEBUG _Tp type;}; 1209 1210#if _LIBCPP_STD_VER > 11 1211template <class _Tp> using remove_reference_t = typename remove_reference<_Tp>::type; 1212#endif 1213 1214// add_lvalue_reference 1215 1216template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_lvalue_reference_impl { typedef _LIBCPP_NODEBUG _Tp type; }; 1217template <class _Tp > struct __add_lvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp& type; }; 1218 1219template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_lvalue_reference 1220{typedef _LIBCPP_NODEBUG typename __add_lvalue_reference_impl<_Tp>::type type;}; 1221 1222#if _LIBCPP_STD_VER > 11 1223template <class _Tp> using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type; 1224#endif 1225 1226template <class _Tp, bool = __is_referenceable<_Tp>::value> struct __add_rvalue_reference_impl { typedef _LIBCPP_NODEBUG _Tp type; }; 1227template <class _Tp > struct __add_rvalue_reference_impl<_Tp, true> { typedef _LIBCPP_NODEBUG _Tp&& type; }; 1228 1229template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_rvalue_reference 1230{typedef _LIBCPP_NODEBUG typename __add_rvalue_reference_impl<_Tp>::type type;}; 1231 1232#if _LIBCPP_STD_VER > 11 1233template <class _Tp> using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type; 1234#endif 1235 1236template <class _Tp> 1237struct __unconstref { 1238 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 1239}; 1240 1241template <class _Tp> 1242using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type; 1243 1244// __is_same_uncvref 1245 1246template <class _Tp, class _Up> 1247struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {}; 1248 1249#if _LIBCPP_STD_VER > 17 1250// remove_cvref - same as __uncvref 1251template <class _Tp> 1252struct remove_cvref { 1253 using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>; 1254}; 1255 1256template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 1257#endif 1258 1259 1260struct __any 1261{ 1262 __any(...); 1263}; 1264 1265// remove_pointer 1266 1267template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer {typedef _LIBCPP_NODEBUG _Tp type;}; 1268template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp*> {typedef _LIBCPP_NODEBUG _Tp type;}; 1269template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const> {typedef _LIBCPP_NODEBUG _Tp type;}; 1270template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* volatile> {typedef _LIBCPP_NODEBUG _Tp type;}; 1271template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_pointer<_Tp* const volatile> {typedef _LIBCPP_NODEBUG _Tp type;}; 1272 1273#if _LIBCPP_STD_VER > 11 1274template <class _Tp> using remove_pointer_t = typename remove_pointer<_Tp>::type; 1275#endif 1276 1277// add_pointer 1278 1279template <class _Tp, 1280 bool = __is_referenceable<_Tp>::value || 1281 _IsSame<typename remove_cv<_Tp>::type, void>::value> 1282struct __add_pointer_impl 1283 {typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type* type;}; 1284template <class _Tp> struct __add_pointer_impl<_Tp, false> 1285 {typedef _LIBCPP_NODEBUG _Tp type;}; 1286 1287template <class _Tp> struct _LIBCPP_TEMPLATE_VIS add_pointer 1288 {typedef _LIBCPP_NODEBUG typename __add_pointer_impl<_Tp>::type type;}; 1289 1290#if _LIBCPP_STD_VER > 11 1291template <class _Tp> using add_pointer_t = typename add_pointer<_Tp>::type; 1292#endif 1293 1294// type_identity 1295 1296template <class _Tp> 1297struct __type_identity { typedef _Tp type; }; 1298 1299template <class _Tp> 1300using __type_identity_t _LIBCPP_NODEBUG = typename __type_identity<_Tp>::type; 1301 1302#if _LIBCPP_STD_VER > 17 1303template<class _Tp> struct type_identity { typedef _Tp type; }; 1304template<class _Tp> using type_identity_t = typename type_identity<_Tp>::type; 1305#endif 1306 1307// is_signed 1308 1309#if __has_keyword(__is_signed) 1310 1311template<class _Tp> 1312struct _LIBCPP_TEMPLATE_VIS is_signed : _BoolConstant<__is_signed(_Tp)> { }; 1313 1314#if _LIBCPP_STD_VER > 14 1315template <class _Tp> 1316inline constexpr bool is_signed_v = __is_signed(_Tp); 1317#endif 1318 1319#else // __has_keyword(__is_signed) 1320 1321template <class _Tp, bool = is_integral<_Tp>::value> 1322struct __libcpp_is_signed_impl : public _BoolConstant<(_Tp(-1) < _Tp(0))> {}; 1323 1324template <class _Tp> 1325struct __libcpp_is_signed_impl<_Tp, false> : public true_type {}; // floating point 1326 1327template <class _Tp, bool = is_arithmetic<_Tp>::value> 1328struct __libcpp_is_signed : public __libcpp_is_signed_impl<_Tp> {}; 1329 1330template <class _Tp> struct __libcpp_is_signed<_Tp, false> : public false_type {}; 1331 1332template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_signed : public __libcpp_is_signed<_Tp> {}; 1333 1334#if _LIBCPP_STD_VER > 14 1335template <class _Tp> 1336inline constexpr bool is_signed_v = is_signed<_Tp>::value; 1337#endif 1338 1339#endif // __has_keyword(__is_signed) 1340 1341// is_unsigned 1342 1343// Before Clang 13, __is_unsigned returned true for enums with signed underlying type. 1344// No currently-released version of AppleClang contains the fixed intrinsic. 1345#if __has_keyword(__is_unsigned) && \ 1346 !(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 1300) && \ 1347 !defined(_LIBCPP_APPLE_CLANG_VER) 1348 1349template<class _Tp> 1350struct _LIBCPP_TEMPLATE_VIS is_unsigned : _BoolConstant<__is_unsigned(_Tp)> { }; 1351 1352#if _LIBCPP_STD_VER > 14 1353template <class _Tp> 1354inline constexpr bool is_unsigned_v = __is_unsigned(_Tp); 1355#endif 1356 1357#else // __has_keyword(__is_unsigned) 1358 1359template <class _Tp, bool = is_integral<_Tp>::value> 1360struct __libcpp_is_unsigned_impl : public _BoolConstant<(_Tp(0) < _Tp(-1))> {}; 1361 1362template <class _Tp> 1363struct __libcpp_is_unsigned_impl<_Tp, false> : public false_type {}; // floating point 1364 1365template <class _Tp, bool = is_arithmetic<_Tp>::value> 1366struct __libcpp_is_unsigned : public __libcpp_is_unsigned_impl<_Tp> {}; 1367 1368template <class _Tp> struct __libcpp_is_unsigned<_Tp, false> : public false_type {}; 1369 1370template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unsigned : public __libcpp_is_unsigned<_Tp> {}; 1371 1372#if _LIBCPP_STD_VER > 14 1373template <class _Tp> 1374inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value; 1375#endif 1376 1377#endif // __has_keyword(__is_unsigned) 1378 1379// rank 1380 1381template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank 1382 : public integral_constant<size_t, 0> {}; 1383template <class _Tp> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[]> 1384 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1385template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS rank<_Tp[_Np]> 1386 : public integral_constant<size_t, rank<_Tp>::value + 1> {}; 1387 1388#if _LIBCPP_STD_VER > 14 1389template <class _Tp> 1390inline constexpr size_t rank_v = rank<_Tp>::value; 1391#endif 1392 1393// extent 1394 1395#if __has_keyword(__array_extent) 1396 1397template<class _Tp, size_t _Dim = 0> 1398struct _LIBCPP_TEMPLATE_VIS extent 1399 : integral_constant<size_t, __array_extent(_Tp, _Dim)> { }; 1400 1401#if _LIBCPP_STD_VER > 14 1402template <class _Tp, unsigned _Ip = 0> 1403inline constexpr size_t extent_v = __array_extent(_Tp, _Ip); 1404#endif 1405 1406#else // __has_keyword(__array_extent) 1407 1408template <class _Tp, unsigned _Ip = 0> struct _LIBCPP_TEMPLATE_VIS extent 1409 : public integral_constant<size_t, 0> {}; 1410template <class _Tp> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], 0> 1411 : public integral_constant<size_t, 0> {}; 1412template <class _Tp, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[], _Ip> 1413 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1414template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], 0> 1415 : public integral_constant<size_t, _Np> {}; 1416template <class _Tp, size_t _Np, unsigned _Ip> struct _LIBCPP_TEMPLATE_VIS extent<_Tp[_Np], _Ip> 1417 : public integral_constant<size_t, extent<_Tp, _Ip-1>::value> {}; 1418 1419#if _LIBCPP_STD_VER > 14 1420template <class _Tp, unsigned _Ip = 0> 1421inline constexpr size_t extent_v = extent<_Tp, _Ip>::value; 1422#endif 1423 1424#endif // __has_keyword(__array_extent) 1425 1426// remove_extent 1427 1428template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent 1429 {typedef _Tp type;}; 1430template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[]> 1431 {typedef _Tp type;}; 1432template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_extent<_Tp[_Np]> 1433 {typedef _Tp type;}; 1434 1435#if _LIBCPP_STD_VER > 11 1436template <class _Tp> using remove_extent_t = typename remove_extent<_Tp>::type; 1437#endif 1438 1439// remove_all_extents 1440 1441template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents 1442 {typedef _Tp type;}; 1443template <class _Tp> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[]> 1444 {typedef typename remove_all_extents<_Tp>::type type;}; 1445template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS remove_all_extents<_Tp[_Np]> 1446 {typedef typename remove_all_extents<_Tp>::type type;}; 1447 1448#if _LIBCPP_STD_VER > 11 1449template <class _Tp> using remove_all_extents_t = typename remove_all_extents<_Tp>::type; 1450#endif 1451 1452#if _LIBCPP_STD_VER > 17 1453// is_bounded_array 1454 1455template <class> struct _LIBCPP_TEMPLATE_VIS is_bounded_array : false_type {}; 1456template <class _Tp, size_t _Np> struct _LIBCPP_TEMPLATE_VIS is_bounded_array<_Tp[_Np]> : true_type {}; 1457 1458template <class _Tp> 1459inline constexpr 1460bool is_bounded_array_v = is_bounded_array<_Tp>::value; 1461 1462// is_unbounded_array 1463 1464template <class> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array : false_type {}; 1465template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_unbounded_array<_Tp[]> : true_type {}; 1466 1467template <class _Tp> 1468inline constexpr 1469bool is_unbounded_array_v = is_unbounded_array<_Tp>::value; 1470#endif 1471 1472// decay 1473 1474template <class _Up, bool> 1475struct __decay { 1476 typedef _LIBCPP_NODEBUG typename remove_cv<_Up>::type type; 1477}; 1478 1479template <class _Up> 1480struct __decay<_Up, true> { 1481public: 1482 typedef _LIBCPP_NODEBUG typename conditional 1483 < 1484 is_array<_Up>::value, 1485 typename remove_extent<_Up>::type*, 1486 typename conditional 1487 < 1488 is_function<_Up>::value, 1489 typename add_pointer<_Up>::type, 1490 typename remove_cv<_Up>::type 1491 >::type 1492 >::type type; 1493}; 1494 1495template <class _Tp> 1496struct _LIBCPP_TEMPLATE_VIS decay 1497{ 1498private: 1499 typedef _LIBCPP_NODEBUG typename remove_reference<_Tp>::type _Up; 1500public: 1501 typedef _LIBCPP_NODEBUG typename __decay<_Up, __is_referenceable<_Up>::value>::type type; 1502}; 1503 1504#if _LIBCPP_STD_VER > 11 1505template <class _Tp> using decay_t = typename decay<_Tp>::type; 1506#endif 1507 1508// is_abstract 1509 1510template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_abstract 1511 : public integral_constant<bool, __is_abstract(_Tp)> {}; 1512 1513#if _LIBCPP_STD_VER > 14 1514template <class _Tp> 1515inline constexpr bool is_abstract_v = is_abstract<_Tp>::value; 1516#endif 1517 1518// is_final 1519 1520template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1521__libcpp_is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1522 1523#if _LIBCPP_STD_VER > 11 1524template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1525is_final : public integral_constant<bool, __is_final(_Tp)> {}; 1526#endif 1527 1528#if _LIBCPP_STD_VER > 14 1529template <class _Tp> 1530inline constexpr bool is_final_v = is_final<_Tp>::value; 1531#endif 1532 1533// is_aggregate 1534#if _LIBCPP_STD_VER > 14 1535 1536template <class _Tp> struct _LIBCPP_TEMPLATE_VIS 1537is_aggregate : public integral_constant<bool, __is_aggregate(_Tp)> {}; 1538 1539template <class _Tp> 1540inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value; 1541 1542#endif // _LIBCPP_STD_VER > 14 1543 1544// is_base_of 1545 1546template <class _Bp, class _Dp> 1547struct _LIBCPP_TEMPLATE_VIS is_base_of 1548 : public integral_constant<bool, __is_base_of(_Bp, _Dp)> {}; 1549 1550#if _LIBCPP_STD_VER > 14 1551template <class _Bp, class _Dp> 1552inline constexpr bool is_base_of_v = is_base_of<_Bp, _Dp>::value; 1553#endif 1554 1555// __is_core_convertible 1556 1557// [conv.general]/3 says "E is convertible to T" whenever "T t=E;" is well-formed. 1558// We can't test for that, but we can test implicit convertibility by passing it 1559// to a function. Notice that __is_core_convertible<void,void> is false, 1560// and __is_core_convertible<immovable-type,immovable-type> is true in C++17 and later. 1561 1562template <class _Tp, class _Up, class = void> 1563struct __is_core_convertible : public false_type {}; 1564 1565template <class _Tp, class _Up> 1566struct __is_core_convertible<_Tp, _Up, decltype( 1567 static_cast<void(*)(_Up)>(0) ( static_cast<_Tp(*)()>(0)() ) 1568)> : public true_type {}; 1569 1570// is_convertible 1571 1572#if __has_feature(is_convertible_to) && !defined(_LIBCPP_USE_IS_CONVERTIBLE_FALLBACK) 1573 1574template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1575 : public integral_constant<bool, __is_convertible_to(_T1, _T2)> {}; 1576 1577#else // __has_feature(is_convertible_to) 1578 1579namespace __is_convertible_imp 1580{ 1581template <class _Tp> void __test_convert(_Tp); 1582 1583template <class _From, class _To, class = void> 1584struct __is_convertible_test : public false_type {}; 1585 1586template <class _From, class _To> 1587struct __is_convertible_test<_From, _To, 1588 decltype(__is_convertible_imp::__test_convert<_To>(declval<_From>()))> : public true_type 1589{}; 1590 1591template <class _Tp, bool _IsArray = is_array<_Tp>::value, 1592 bool _IsFunction = is_function<_Tp>::value, 1593 bool _IsVoid = is_void<_Tp>::value> 1594 struct __is_array_function_or_void {enum {value = 0};}; 1595template <class _Tp> struct __is_array_function_or_void<_Tp, true, false, false> {enum {value = 1};}; 1596template <class _Tp> struct __is_array_function_or_void<_Tp, false, true, false> {enum {value = 2};}; 1597template <class _Tp> struct __is_array_function_or_void<_Tp, false, false, true> {enum {value = 3};}; 1598} 1599 1600template <class _Tp, 1601 unsigned = __is_convertible_imp::__is_array_function_or_void<typename remove_reference<_Tp>::type>::value> 1602struct __is_convertible_check 1603{ 1604 static const size_t __v = 0; 1605}; 1606 1607template <class _Tp> 1608struct __is_convertible_check<_Tp, 0> 1609{ 1610 static const size_t __v = sizeof(_Tp); 1611}; 1612 1613template <class _T1, class _T2, 1614 unsigned _T1_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T1>::value, 1615 unsigned _T2_is_array_function_or_void = __is_convertible_imp::__is_array_function_or_void<_T2>::value> 1616struct __is_convertible 1617 : public integral_constant<bool, 1618 __is_convertible_imp::__is_convertible_test<_T1, _T2>::value 1619 > 1620{}; 1621 1622template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 1> : public false_type {}; 1623template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 1> : public false_type {}; 1624template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 1> : public false_type {}; 1625template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 1> : public false_type {}; 1626 1627template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 2> : public false_type {}; 1628template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 2> : public false_type {}; 1629template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 2> : public false_type {}; 1630template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 2> : public false_type {}; 1631 1632template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 0, 3> : public false_type {}; 1633template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 1, 3> : public false_type {}; 1634template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 2, 3> : public false_type {}; 1635template <class _T1, class _T2> struct __is_convertible<_T1, _T2, 3, 3> : public true_type {}; 1636 1637template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS is_convertible 1638 : public __is_convertible<_T1, _T2> 1639{ 1640 static const size_t __complete_check1 = __is_convertible_check<_T1>::__v; 1641 static const size_t __complete_check2 = __is_convertible_check<_T2>::__v; 1642}; 1643 1644#endif // __has_feature(is_convertible_to) 1645 1646#if _LIBCPP_STD_VER > 14 1647template <class _From, class _To> 1648inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value; 1649#endif 1650 1651// is_nothrow_convertible 1652 1653#if _LIBCPP_STD_VER > 17 1654 1655template <typename _Tp> 1656static void __test_noexcept(_Tp) noexcept; 1657 1658template<typename _Fm, typename _To> 1659static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 1660__is_nothrow_convertible_test(); 1661 1662template <typename _Fm, typename _To> 1663struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 1664{ }; 1665 1666template <typename _Fm, typename _To> 1667struct is_nothrow_convertible : _Or< 1668 _And<is_void<_To>, is_void<_Fm>>, 1669 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 1670>::type { }; 1671 1672template <typename _Fm, typename _To> 1673inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 1674 1675#endif // _LIBCPP_STD_VER > 17 1676 1677// is_empty 1678 1679#if __has_feature(is_empty) || defined(_LIBCPP_COMPILER_GCC) 1680 1681template <class _Tp> 1682struct _LIBCPP_TEMPLATE_VIS is_empty 1683 : public integral_constant<bool, __is_empty(_Tp)> {}; 1684 1685#else // __has_feature(is_empty) 1686 1687template <class _Tp> 1688struct __is_empty1 1689 : public _Tp 1690{ 1691 double __lx; 1692}; 1693 1694struct __is_empty2 1695{ 1696 double __lx; 1697}; 1698 1699template <class _Tp, bool = is_class<_Tp>::value> 1700struct __libcpp_empty : public integral_constant<bool, sizeof(__is_empty1<_Tp>) == sizeof(__is_empty2)> {}; 1701 1702template <class _Tp> struct __libcpp_empty<_Tp, false> : public false_type {}; 1703 1704template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_empty : public __libcpp_empty<_Tp> {}; 1705 1706#endif // __has_feature(is_empty) 1707 1708#if _LIBCPP_STD_VER > 14 1709template <class _Tp> 1710inline constexpr bool is_empty_v = is_empty<_Tp>::value; 1711#endif 1712 1713// is_polymorphic 1714 1715#if __has_feature(is_polymorphic) || defined(_LIBCPP_COMPILER_MSVC) 1716 1717template <class _Tp> 1718struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1719 : public integral_constant<bool, __is_polymorphic(_Tp)> {}; 1720 1721#else 1722 1723template<typename _Tp> char &__is_polymorphic_impl( 1724 typename enable_if<sizeof((_Tp*)dynamic_cast<const volatile void*>(declval<_Tp*>())) != 0, 1725 int>::type); 1726template<typename _Tp> __two &__is_polymorphic_impl(...); 1727 1728template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_polymorphic 1729 : public integral_constant<bool, sizeof(__is_polymorphic_impl<_Tp>(0)) == 1> {}; 1730 1731#endif // __has_feature(is_polymorphic) 1732 1733#if _LIBCPP_STD_VER > 14 1734template <class _Tp> 1735inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value; 1736#endif 1737 1738// has_virtual_destructor 1739 1740#if __has_feature(has_virtual_destructor) || defined(_LIBCPP_COMPILER_GCC) 1741 1742template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1743 : public integral_constant<bool, __has_virtual_destructor(_Tp)> {}; 1744 1745#else 1746 1747template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_virtual_destructor 1748 : public false_type {}; 1749 1750#endif 1751 1752#if _LIBCPP_STD_VER > 14 1753template <class _Tp> 1754inline constexpr bool has_virtual_destructor_v = has_virtual_destructor<_Tp>::value; 1755#endif 1756 1757// has_unique_object_representations 1758 1759#if _LIBCPP_STD_VER > 14 1760 1761template <class _Tp> struct _LIBCPP_TEMPLATE_VIS has_unique_object_representations 1762 : public integral_constant<bool, 1763 __has_unique_object_representations(remove_cv_t<remove_all_extents_t<_Tp>>)> {}; 1764 1765template <class _Tp> 1766inline constexpr bool has_unique_object_representations_v = has_unique_object_representations<_Tp>::value; 1767 1768#endif 1769 1770// alignment_of 1771 1772template <class _Tp> struct _LIBCPP_TEMPLATE_VIS alignment_of 1773 : public integral_constant<size_t, _LIBCPP_ALIGNOF(_Tp)> {}; 1774 1775#if _LIBCPP_STD_VER > 14 1776template <class _Tp> 1777inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value; 1778#endif 1779 1780// aligned_storage 1781 1782template <class _Hp, class _Tp> 1783struct __type_list 1784{ 1785 typedef _Hp _Head; 1786 typedef _Tp _Tail; 1787}; 1788 1789struct __nat 1790{ 1791#ifndef _LIBCPP_CXX03_LANG 1792 __nat() = delete; 1793 __nat(const __nat&) = delete; 1794 __nat& operator=(const __nat&) = delete; 1795 ~__nat() = delete; 1796#endif 1797}; 1798 1799template <class _Tp> 1800struct __align_type 1801{ 1802 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 1803 typedef _Tp type; 1804}; 1805 1806struct __struct_double {long double __lx;}; 1807struct __struct_double4 {double __lx[4];}; 1808 1809typedef 1810 __type_list<__align_type<unsigned char>, 1811 __type_list<__align_type<unsigned short>, 1812 __type_list<__align_type<unsigned int>, 1813 __type_list<__align_type<unsigned long>, 1814 __type_list<__align_type<unsigned long long>, 1815 __type_list<__align_type<double>, 1816 __type_list<__align_type<long double>, 1817 __type_list<__align_type<__struct_double>, 1818 __type_list<__align_type<__struct_double4>, 1819 __type_list<__align_type<int*>, 1820 __nat 1821 > > > > > > > > > > __all_types; 1822 1823template <size_t _Align> 1824struct _ALIGNAS(_Align) __fallback_overaligned {}; 1825 1826template <class _TL, size_t _Align> struct __find_pod; 1827 1828template <class _Hp, size_t _Align> 1829struct __find_pod<__type_list<_Hp, __nat>, _Align> 1830{ 1831 typedef typename conditional< 1832 _Align == _Hp::value, 1833 typename _Hp::type, 1834 __fallback_overaligned<_Align> 1835 >::type type; 1836}; 1837 1838template <class _Hp, class _Tp, size_t _Align> 1839struct __find_pod<__type_list<_Hp, _Tp>, _Align> 1840{ 1841 typedef typename conditional< 1842 _Align == _Hp::value, 1843 typename _Hp::type, 1844 typename __find_pod<_Tp, _Align>::type 1845 >::type type; 1846}; 1847 1848template <class _TL, size_t _Len> struct __find_max_align; 1849 1850template <class _Hp, size_t _Len> 1851struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 1852 1853template <size_t _Len, size_t _A1, size_t _A2> 1854struct __select_align 1855{ 1856private: 1857 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 1858 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 1859public: 1860 static const size_t value = _Len < __max ? __min : __max; 1861}; 1862 1863template <class _Hp, class _Tp, size_t _Len> 1864struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 1865 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 1866 1867template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1868struct _LIBCPP_TEMPLATE_VIS aligned_storage 1869{ 1870 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 1871 union type 1872 { 1873 _Aligner __align; 1874 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 1875 }; 1876}; 1877 1878#if _LIBCPP_STD_VER > 11 1879template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 1880 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 1881#endif 1882 1883#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 1884template <size_t _Len>\ 1885struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 1886{\ 1887 struct _ALIGNAS(n) type\ 1888 {\ 1889 unsigned char __lx[(_Len + n - 1)/n * n];\ 1890 };\ 1891} 1892 1893_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 1894_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 1895_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 1896_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 1897_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 1898_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 1899_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 1900_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 1901_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 1902_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 1903_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 1904_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 1905_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 1906_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 1907// PE/COFF does not support alignment beyond 8192 (=0x2000) 1908#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1909_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 1910#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 1911 1912#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 1913 1914 1915// aligned_union 1916 1917template <size_t _I0, size_t ..._In> 1918struct __static_max; 1919 1920template <size_t _I0> 1921struct __static_max<_I0> 1922{ 1923 static const size_t value = _I0; 1924}; 1925 1926template <size_t _I0, size_t _I1, size_t ..._In> 1927struct __static_max<_I0, _I1, _In...> 1928{ 1929 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 1930 __static_max<_I1, _In...>::value; 1931}; 1932 1933template <size_t _Len, class _Type0, class ..._Types> 1934struct aligned_union 1935{ 1936 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 1937 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 1938 static const size_t __len = __static_max<_Len, sizeof(_Type0), 1939 sizeof(_Types)...>::value; 1940 typedef typename aligned_storage<__len, alignment_value>::type type; 1941}; 1942 1943#if _LIBCPP_STD_VER > 11 1944template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 1945#endif 1946 1947template <class _Tp> 1948struct __numeric_type 1949{ 1950 static void __test(...); 1951 static float __test(float); 1952 static double __test(char); 1953 static double __test(int); 1954 static double __test(unsigned); 1955 static double __test(long); 1956 static double __test(unsigned long); 1957 static double __test(long long); 1958 static double __test(unsigned long long); 1959 static double __test(double); 1960 static long double __test(long double); 1961 1962 typedef decltype(__test(declval<_Tp>())) type; 1963 static const bool value = _IsNotSame<type, void>::value; 1964}; 1965 1966template <> 1967struct __numeric_type<void> 1968{ 1969 static const bool value = true; 1970}; 1971 1972// __promote 1973 1974template <class _A1, class _A2 = void, class _A3 = void, 1975 bool = __numeric_type<_A1>::value && 1976 __numeric_type<_A2>::value && 1977 __numeric_type<_A3>::value> 1978class __promote_imp 1979{ 1980public: 1981 static const bool value = false; 1982}; 1983 1984template <class _A1, class _A2, class _A3> 1985class __promote_imp<_A1, _A2, _A3, true> 1986{ 1987private: 1988 typedef typename __promote_imp<_A1>::type __type1; 1989 typedef typename __promote_imp<_A2>::type __type2; 1990 typedef typename __promote_imp<_A3>::type __type3; 1991public: 1992 typedef decltype(__type1() + __type2() + __type3()) type; 1993 static const bool value = true; 1994}; 1995 1996template <class _A1, class _A2> 1997class __promote_imp<_A1, _A2, void, true> 1998{ 1999private: 2000 typedef typename __promote_imp<_A1>::type __type1; 2001 typedef typename __promote_imp<_A2>::type __type2; 2002public: 2003 typedef decltype(__type1() + __type2()) type; 2004 static const bool value = true; 2005}; 2006 2007template <class _A1> 2008class __promote_imp<_A1, void, void, true> 2009{ 2010public: 2011 typedef typename __numeric_type<_A1>::type type; 2012 static const bool value = true; 2013}; 2014 2015template <class _A1, class _A2 = void, class _A3 = void> 2016class __promote : public __promote_imp<_A1, _A2, _A3> {}; 2017 2018// make_signed / make_unsigned 2019 2020typedef 2021 __type_list<signed char, 2022 __type_list<signed short, 2023 __type_list<signed int, 2024 __type_list<signed long, 2025 __type_list<signed long long, 2026#ifndef _LIBCPP_HAS_NO_INT128 2027 __type_list<__int128_t, 2028#endif 2029 __nat 2030#ifndef _LIBCPP_HAS_NO_INT128 2031 > 2032#endif 2033 > > > > > __signed_types; 2034 2035typedef 2036 __type_list<unsigned char, 2037 __type_list<unsigned short, 2038 __type_list<unsigned int, 2039 __type_list<unsigned long, 2040 __type_list<unsigned long long, 2041#ifndef _LIBCPP_HAS_NO_INT128 2042 __type_list<__uint128_t, 2043#endif 2044 __nat 2045#ifndef _LIBCPP_HAS_NO_INT128 2046 > 2047#endif 2048 > > > > > __unsigned_types; 2049 2050template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 2051 2052template <class _Hp, class _Tp, size_t _Size> 2053struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 2054{ 2055 typedef _LIBCPP_NODEBUG _Hp type; 2056}; 2057 2058template <class _Hp, class _Tp, size_t _Size> 2059struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 2060{ 2061 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 2062}; 2063 2064template <class _Tp, class _Up, bool = is_const<typename remove_reference<_Tp>::type>::value, 2065 bool = is_volatile<typename remove_reference<_Tp>::type>::value> 2066struct __apply_cv 2067{ 2068 typedef _LIBCPP_NODEBUG _Up type; 2069}; 2070 2071template <class _Tp, class _Up> 2072struct __apply_cv<_Tp, _Up, true, false> 2073{ 2074 typedef _LIBCPP_NODEBUG const _Up type; 2075}; 2076 2077template <class _Tp, class _Up> 2078struct __apply_cv<_Tp, _Up, false, true> 2079{ 2080 typedef volatile _Up type; 2081}; 2082 2083template <class _Tp, class _Up> 2084struct __apply_cv<_Tp, _Up, true, true> 2085{ 2086 typedef const volatile _Up type; 2087}; 2088 2089template <class _Tp, class _Up> 2090struct __apply_cv<_Tp&, _Up, false, false> 2091{ 2092 typedef _Up& type; 2093}; 2094 2095template <class _Tp, class _Up> 2096struct __apply_cv<_Tp&, _Up, true, false> 2097{ 2098 typedef const _Up& type; 2099}; 2100 2101template <class _Tp, class _Up> 2102struct __apply_cv<_Tp&, _Up, false, true> 2103{ 2104 typedef volatile _Up& type; 2105}; 2106 2107template <class _Tp, class _Up> 2108struct __apply_cv<_Tp&, _Up, true, true> 2109{ 2110 typedef const volatile _Up& type; 2111}; 2112 2113template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2114struct __make_signed {}; 2115 2116template <class _Tp> 2117struct __make_signed<_Tp, true> 2118{ 2119 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 2120}; 2121 2122template <> struct __make_signed<bool, true> {}; 2123template <> struct __make_signed< signed short, true> {typedef short type;}; 2124template <> struct __make_signed<unsigned short, true> {typedef short type;}; 2125template <> struct __make_signed< signed int, true> {typedef int type;}; 2126template <> struct __make_signed<unsigned int, true> {typedef int type;}; 2127template <> struct __make_signed< signed long, true> {typedef long type;}; 2128template <> struct __make_signed<unsigned long, true> {typedef long type;}; 2129template <> struct __make_signed< signed long long, true> {typedef long long type;}; 2130template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 2131#ifndef _LIBCPP_HAS_NO_INT128 2132template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 2133template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 2134#endif 2135 2136template <class _Tp> 2137struct _LIBCPP_TEMPLATE_VIS make_signed 2138{ 2139 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 2140}; 2141 2142#if _LIBCPP_STD_VER > 11 2143template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 2144#endif 2145 2146template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 2147struct __make_unsigned {}; 2148 2149template <class _Tp> 2150struct __make_unsigned<_Tp, true> 2151{ 2152 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 2153}; 2154 2155template <> struct __make_unsigned<bool, true> {}; 2156template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 2157template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 2158template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 2159template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 2160template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 2161template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 2162template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 2163template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 2164#ifndef _LIBCPP_HAS_NO_INT128 2165template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 2166template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 2167#endif 2168 2169template <class _Tp> 2170struct _LIBCPP_TEMPLATE_VIS make_unsigned 2171{ 2172 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 2173}; 2174 2175#if _LIBCPP_STD_VER > 11 2176template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 2177#endif 2178 2179#ifndef _LIBCPP_CXX03_LANG 2180template <class _Tp> 2181_LIBCPP_HIDE_FROM_ABI constexpr 2182typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 2183 return static_cast<typename make_unsigned<_Tp>::type>(__x); 2184} 2185#endif 2186 2187#if _LIBCPP_STD_VER > 14 2188template <class...> using void_t = void; 2189#endif 2190 2191#if _LIBCPP_STD_VER > 17 2192// Let COND_RES(X, Y) be: 2193template <class _Tp, class _Up> 2194using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 2195 2196template <class _Tp, class _Up, class = void> 2197struct __common_type3 {}; 2198 2199// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 2200template <class _Tp, class _Up> 2201struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 2202{ 2203 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 2204}; 2205 2206template <class _Tp, class _Up, class = void> 2207struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 2208#else 2209template <class _Tp, class _Up, class = void> 2210struct __common_type2_imp {}; 2211#endif 2212 2213// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 2214template <class _Tp, class _Up> 2215struct __common_type2_imp<_Tp, _Up, 2216 typename __void_t<decltype( 2217 true ? declval<_Tp>() : declval<_Up>() 2218 )>::type> 2219{ 2220 typedef _LIBCPP_NODEBUG typename decay<decltype( 2221 true ? declval<_Tp>() : declval<_Up>() 2222 )>::type type; 2223}; 2224 2225template <class, class = void> 2226struct __common_type_impl {}; 2227 2228// Clang provides variadic templates in C++03 as an extension. 2229#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 2230# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 2231template <class... _Tp> 2232struct __common_types; 2233template <class... _Tp> 2234struct _LIBCPP_TEMPLATE_VIS common_type; 2235#else 2236# define _LIBCPP_OPTIONAL_PACK(...) 2237struct __no_arg; 2238template <class _Tp, class _Up, class = __no_arg> 2239struct __common_types; 2240template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 2241 class _Unused = __no_arg> 2242struct common_type { 2243 static_assert(sizeof(_Unused) == 0, 2244 "common_type accepts at most 3 arguments in C++03"); 2245}; 2246#endif // _LIBCPP_CXX03_LANG 2247 2248template <class _Tp, class _Up> 2249struct __common_type_impl< 2250 __common_types<_Tp, _Up>, 2251 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2252{ 2253 typedef typename common_type<_Tp, _Up>::type type; 2254}; 2255 2256template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2257struct __common_type_impl< 2258 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 2259 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 2260 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 2261 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 2262}; 2263 2264// bullet 1 - sizeof...(Tp) == 0 2265 2266template <> 2267struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 2268 2269// bullet 2 - sizeof...(Tp) == 1 2270 2271template <class _Tp> 2272struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 2273 : public common_type<_Tp, _Tp> {}; 2274 2275// bullet 3 - sizeof...(Tp) == 2 2276 2277// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 2278template <class _Tp, class _Up> 2279struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 2280 : conditional< 2281 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 2282 __common_type2_imp<_Tp, _Up>, 2283 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 2284 >::type 2285{}; 2286 2287// bullet 4 - sizeof...(Tp) > 2 2288 2289template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 2290struct _LIBCPP_TEMPLATE_VIS 2291 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 2292 : __common_type_impl< 2293 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 2294 2295#undef _LIBCPP_OPTIONAL_PACK 2296 2297#if _LIBCPP_STD_VER > 11 2298template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 2299#endif 2300 2301#if _LIBCPP_STD_VER > 11 2302// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 2303// top-level cv-qualifiers. 2304template <class _From, class _To> 2305struct __copy_cv 2306{ 2307 using type = _To; 2308}; 2309 2310template <class _From, class _To> 2311struct __copy_cv<const _From, _To> 2312{ 2313 using type = add_const_t<_To>; 2314}; 2315 2316template <class _From, class _To> 2317struct __copy_cv<volatile _From, _To> 2318{ 2319 using type = add_volatile_t<_To>; 2320}; 2321 2322template <class _From, class _To> 2323struct __copy_cv<const volatile _From, _To> 2324{ 2325 using type = add_cv_t<_To>; 2326}; 2327 2328template <class _From, class _To> 2329using __copy_cv_t = typename __copy_cv<_From, _To>::type; 2330 2331template <class _From, class _To> 2332struct __copy_cvref 2333{ 2334 using type = __copy_cv_t<_From, _To>; 2335}; 2336 2337template <class _From, class _To> 2338struct __copy_cvref<_From&, _To> 2339{ 2340 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 2341}; 2342 2343template <class _From, class _To> 2344struct __copy_cvref<_From&&, _To> 2345{ 2346 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 2347}; 2348 2349template <class _From, class _To> 2350using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 2351 2352#endif // _LIBCPP_STD_VER > 11 2353 2354// common_reference 2355#if _LIBCPP_STD_VER > 17 2356// Let COND_RES(X, Y) be: 2357template <class _Xp, class _Yp> 2358using __cond_res = 2359 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 2360 2361// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 2362// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 2363// `U`. 2364// [Note: `XREF(A)` is `__xref<A>::template __apply`] 2365template <class _Tp> 2366struct __xref { 2367 template<class _Up> 2368 using __apply = __copy_cvref_t<_Tp, _Up>; 2369}; 2370 2371// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 2372// and let COMMON-REF(A, B) be: 2373template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 2374struct __common_ref; 2375 2376template<class _Xp, class _Yp> 2377using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 2378 2379template<class _Xp, class _Yp> 2380using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 2381 2382 2383// If A and B are both lvalue reference types, COMMON-REF(A, B) is 2384// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 2385template<class _Ap, class _Bp, class _Xp, class _Yp> 2386requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 2387struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 2388{ 2389 using __type = __cv_cond_res<_Xp, _Yp>; 2390}; 2391 2392// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 2393template <class _Xp, class _Yp> 2394using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 2395 2396 2397// .... If A and B are both rvalue reference types, C is well-formed, and 2398// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 2399template<class _Ap, class _Bp, class _Xp, class _Yp> 2400requires 2401 requires { typename __common_ref_C<_Xp, _Yp>; } && 2402 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 2403 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 2404struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 2405{ 2406 using __type = __common_ref_C<_Xp, _Yp>; 2407}; 2408 2409// Otherwise, let D be COMMON-REF(const X&, Y&). ... 2410template <class _Tp, class _Up> 2411using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 2412 2413// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 2414// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 2415template<class _Ap, class _Bp, class _Xp, class _Yp> 2416requires requires { typename __common_ref_D<_Xp, _Yp>; } && 2417 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 2418struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 2419{ 2420 using __type = __common_ref_D<_Xp, _Yp>; 2421}; 2422 2423// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 2424// COMMON-REF(A, B) is COMMON-REF(B, A). 2425template<class _Ap, class _Bp, class _Xp, class _Yp> 2426struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 2427 2428// Otherwise, COMMON-REF(A, B) is ill-formed. 2429template<class _Ap, class _Bp, class _Xp, class _Yp> 2430struct __common_ref {}; 2431 2432// Note C: For the common_reference trait applied to a parameter pack [...] 2433 2434template <class...> 2435struct common_reference; 2436 2437template <class... _Types> 2438using common_reference_t = typename common_reference<_Types...>::type; 2439 2440// bullet 1 - sizeof...(T) == 0 2441template<> 2442struct common_reference<> {}; 2443 2444// bullet 2 - sizeof...(T) == 1 2445template <class _Tp> 2446struct common_reference<_Tp> 2447{ 2448 using type = _Tp; 2449}; 2450 2451// bullet 3 - sizeof...(T) == 2 2452template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 2453template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 2454template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 2455 2456// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 2457// the member typedef `type` denotes that type. 2458template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 2459 2460template <class _Tp, class _Up> 2461requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 2462struct __common_reference_sub_bullet1<_Tp, _Up> 2463{ 2464 using type = __common_ref_t<_Tp, _Up>; 2465}; 2466 2467// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 2468// is well-formed, then the member typedef `type` denotes that type. 2469template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 2470 2471template <class _Tp, class _Up> 2472using __basic_common_reference_t = typename basic_common_reference< 2473 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 2474 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 2475 2476template <class _Tp, class _Up> 2477requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 2478struct __common_reference_sub_bullet2<_Tp, _Up> 2479{ 2480 using type = __basic_common_reference_t<_Tp, _Up>; 2481}; 2482 2483// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 2484// then the member typedef `type` denotes that type. 2485template <class _Tp, class _Up> 2486requires requires { typename __cond_res<_Tp, _Up>; } 2487struct __common_reference_sub_bullet3<_Tp, _Up> 2488{ 2489 using type = __cond_res<_Tp, _Up>; 2490}; 2491 2492 2493// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 2494// then the member typedef `type` denotes that type. 2495// - Otherwise, there shall be no member `type`. 2496template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 2497 2498// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 2499// any, as `common_reference_t<C, Rest...>`. 2500template <class _Tp, class _Up, class _Vp, class... _Rest> 2501requires requires { typename common_reference_t<_Tp, _Up>; } 2502struct common_reference<_Tp, _Up, _Vp, _Rest...> 2503 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 2504{}; 2505 2506// bullet 5 - Otherwise, there shall be no member `type`. 2507template <class...> struct common_reference {}; 2508 2509#endif // _LIBCPP_STD_VER > 17 2510 2511// is_assignable 2512 2513template<typename, typename _Tp> struct __select_2nd { typedef _LIBCPP_NODEBUG _Tp type; }; 2514 2515#if __has_keyword(__is_assignable) 2516 2517template<class _Tp, class _Up> 2518struct _LIBCPP_TEMPLATE_VIS is_assignable : _BoolConstant<__is_assignable(_Tp, _Up)> { }; 2519 2520#if _LIBCPP_STD_VER > 14 2521template <class _Tp, class _Arg> 2522inline constexpr bool is_assignable_v = __is_assignable(_Tp, _Arg); 2523#endif 2524 2525#else // __has_keyword(__is_assignable) 2526 2527template <class _Tp, class _Arg> 2528typename __select_2nd<decltype((declval<_Tp>() = declval<_Arg>())), true_type>::type 2529__is_assignable_test(int); 2530 2531template <class, class> 2532false_type __is_assignable_test(...); 2533 2534 2535template <class _Tp, class _Arg, bool = is_void<_Tp>::value || is_void<_Arg>::value> 2536struct __is_assignable_imp 2537 : public decltype((_VSTD::__is_assignable_test<_Tp, _Arg>(0))) {}; 2538 2539template <class _Tp, class _Arg> 2540struct __is_assignable_imp<_Tp, _Arg, true> 2541 : public false_type 2542{ 2543}; 2544 2545template <class _Tp, class _Arg> 2546struct is_assignable 2547 : public __is_assignable_imp<_Tp, _Arg> {}; 2548 2549#if _LIBCPP_STD_VER > 14 2550template <class _Tp, class _Arg> 2551inline constexpr bool is_assignable_v = is_assignable<_Tp, _Arg>::value; 2552#endif 2553 2554#endif // __has_keyword(__is_assignable) 2555 2556// is_copy_assignable 2557 2558template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_copy_assignable 2559 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2560 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2561 2562#if _LIBCPP_STD_VER > 14 2563template <class _Tp> 2564inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value; 2565#endif 2566 2567// is_move_assignable 2568 2569template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_move_assignable 2570 : public is_assignable<typename add_lvalue_reference<_Tp>::type, 2571 typename add_rvalue_reference<_Tp>::type> {}; 2572 2573#if _LIBCPP_STD_VER > 14 2574template <class _Tp> 2575inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value; 2576#endif 2577 2578// is_destructible 2579 2580#if __has_keyword(__is_destructible) 2581 2582template<class _Tp> 2583struct _LIBCPP_TEMPLATE_VIS is_destructible : _BoolConstant<__is_destructible(_Tp)> { }; 2584 2585#if _LIBCPP_STD_VER > 14 2586template <class _Tp> 2587inline constexpr bool is_destructible_v = __is_destructible(_Tp); 2588#endif 2589 2590#else // __has_keyword(__is_destructible) 2591 2592// if it's a reference, return true 2593// if it's a function, return false 2594// if it's void, return false 2595// if it's an array of unknown bound, return false 2596// Otherwise, return "declval<_Up&>().~_Up()" is well-formed 2597// where _Up is remove_all_extents<_Tp>::type 2598 2599template <class> 2600struct __is_destructible_apply { typedef int type; }; 2601 2602template <typename _Tp> 2603struct __is_destructor_wellformed { 2604 template <typename _Tp1> 2605 static char __test ( 2606 typename __is_destructible_apply<decltype(declval<_Tp1&>().~_Tp1())>::type 2607 ); 2608 2609 template <typename _Tp1> 2610 static __two __test (...); 2611 2612 static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char); 2613}; 2614 2615template <class _Tp, bool> 2616struct __destructible_imp; 2617 2618template <class _Tp> 2619struct __destructible_imp<_Tp, false> 2620 : public integral_constant<bool, 2621 __is_destructor_wellformed<typename remove_all_extents<_Tp>::type>::value> {}; 2622 2623template <class _Tp> 2624struct __destructible_imp<_Tp, true> 2625 : public true_type {}; 2626 2627template <class _Tp, bool> 2628struct __destructible_false; 2629 2630template <class _Tp> 2631struct __destructible_false<_Tp, false> : public __destructible_imp<_Tp, is_reference<_Tp>::value> {}; 2632 2633template <class _Tp> 2634struct __destructible_false<_Tp, true> : public false_type {}; 2635 2636template <class _Tp> 2637struct is_destructible 2638 : public __destructible_false<_Tp, is_function<_Tp>::value> {}; 2639 2640template <class _Tp> 2641struct is_destructible<_Tp[]> 2642 : public false_type {}; 2643 2644template <> 2645struct is_destructible<void> 2646 : public false_type {}; 2647 2648#if _LIBCPP_STD_VER > 14 2649template <class _Tp> 2650inline constexpr bool is_destructible_v = is_destructible<_Tp>::value; 2651#endif 2652 2653#endif // __has_keyword(__is_destructible) 2654 2655template <class _MP, bool _IsMemberFunctionPtr, bool _IsMemberObjectPtr> 2656struct __member_pointer_traits_imp 2657{ 2658}; 2659 2660template <class _Rp, class _Class, class ..._Param> 2661struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...), true, false> 2662{ 2663 typedef _Class _ClassType; 2664 typedef _Rp _ReturnType; 2665 typedef _Rp (_FnType) (_Param...); 2666}; 2667 2668template <class _Rp, class _Class, class ..._Param> 2669struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...), true, false> 2670{ 2671 typedef _Class _ClassType; 2672 typedef _Rp _ReturnType; 2673 typedef _Rp (_FnType) (_Param..., ...); 2674}; 2675 2676template <class _Rp, class _Class, class ..._Param> 2677struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const, true, false> 2678{ 2679 typedef _Class const _ClassType; 2680 typedef _Rp _ReturnType; 2681 typedef _Rp (_FnType) (_Param...); 2682}; 2683 2684template <class _Rp, class _Class, class ..._Param> 2685struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const, true, false> 2686{ 2687 typedef _Class const _ClassType; 2688 typedef _Rp _ReturnType; 2689 typedef _Rp (_FnType) (_Param..., ...); 2690}; 2691 2692template <class _Rp, class _Class, class ..._Param> 2693struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile, true, false> 2694{ 2695 typedef _Class volatile _ClassType; 2696 typedef _Rp _ReturnType; 2697 typedef _Rp (_FnType) (_Param...); 2698}; 2699 2700template <class _Rp, class _Class, class ..._Param> 2701struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile, true, false> 2702{ 2703 typedef _Class volatile _ClassType; 2704 typedef _Rp _ReturnType; 2705 typedef _Rp (_FnType) (_Param..., ...); 2706}; 2707 2708template <class _Rp, class _Class, class ..._Param> 2709struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile, true, false> 2710{ 2711 typedef _Class const volatile _ClassType; 2712 typedef _Rp _ReturnType; 2713 typedef _Rp (_FnType) (_Param...); 2714}; 2715 2716template <class _Rp, class _Class, class ..._Param> 2717struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile, true, false> 2718{ 2719 typedef _Class const volatile _ClassType; 2720 typedef _Rp _ReturnType; 2721 typedef _Rp (_FnType) (_Param..., ...); 2722}; 2723 2724#if __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2725 2726template <class _Rp, class _Class, class ..._Param> 2727struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &, true, false> 2728{ 2729 typedef _Class& _ClassType; 2730 typedef _Rp _ReturnType; 2731 typedef _Rp (_FnType) (_Param...); 2732}; 2733 2734template <class _Rp, class _Class, class ..._Param> 2735struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &, true, false> 2736{ 2737 typedef _Class& _ClassType; 2738 typedef _Rp _ReturnType; 2739 typedef _Rp (_FnType) (_Param..., ...); 2740}; 2741 2742template <class _Rp, class _Class, class ..._Param> 2743struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&, true, false> 2744{ 2745 typedef _Class const& _ClassType; 2746 typedef _Rp _ReturnType; 2747 typedef _Rp (_FnType) (_Param...); 2748}; 2749 2750template <class _Rp, class _Class, class ..._Param> 2751struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&, true, false> 2752{ 2753 typedef _Class const& _ClassType; 2754 typedef _Rp _ReturnType; 2755 typedef _Rp (_FnType) (_Param..., ...); 2756}; 2757 2758template <class _Rp, class _Class, class ..._Param> 2759struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&, true, false> 2760{ 2761 typedef _Class volatile& _ClassType; 2762 typedef _Rp _ReturnType; 2763 typedef _Rp (_FnType) (_Param...); 2764}; 2765 2766template <class _Rp, class _Class, class ..._Param> 2767struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&, true, false> 2768{ 2769 typedef _Class volatile& _ClassType; 2770 typedef _Rp _ReturnType; 2771 typedef _Rp (_FnType) (_Param..., ...); 2772}; 2773 2774template <class _Rp, class _Class, class ..._Param> 2775struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&, true, false> 2776{ 2777 typedef _Class const volatile& _ClassType; 2778 typedef _Rp _ReturnType; 2779 typedef _Rp (_FnType) (_Param...); 2780}; 2781 2782template <class _Rp, class _Class, class ..._Param> 2783struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&, true, false> 2784{ 2785 typedef _Class const volatile& _ClassType; 2786 typedef _Rp _ReturnType; 2787 typedef _Rp (_FnType) (_Param..., ...); 2788}; 2789 2790template <class _Rp, class _Class, class ..._Param> 2791struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) &&, true, false> 2792{ 2793 typedef _Class&& _ClassType; 2794 typedef _Rp _ReturnType; 2795 typedef _Rp (_FnType) (_Param...); 2796}; 2797 2798template <class _Rp, class _Class, class ..._Param> 2799struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) &&, true, false> 2800{ 2801 typedef _Class&& _ClassType; 2802 typedef _Rp _ReturnType; 2803 typedef _Rp (_FnType) (_Param..., ...); 2804}; 2805 2806template <class _Rp, class _Class, class ..._Param> 2807struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const&&, true, false> 2808{ 2809 typedef _Class const&& _ClassType; 2810 typedef _Rp _ReturnType; 2811 typedef _Rp (_FnType) (_Param...); 2812}; 2813 2814template <class _Rp, class _Class, class ..._Param> 2815struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const&&, true, false> 2816{ 2817 typedef _Class const&& _ClassType; 2818 typedef _Rp _ReturnType; 2819 typedef _Rp (_FnType) (_Param..., ...); 2820}; 2821 2822template <class _Rp, class _Class, class ..._Param> 2823struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) volatile&&, true, false> 2824{ 2825 typedef _Class volatile&& _ClassType; 2826 typedef _Rp _ReturnType; 2827 typedef _Rp (_FnType) (_Param...); 2828}; 2829 2830template <class _Rp, class _Class, class ..._Param> 2831struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) volatile&&, true, false> 2832{ 2833 typedef _Class volatile&& _ClassType; 2834 typedef _Rp _ReturnType; 2835 typedef _Rp (_FnType) (_Param..., ...); 2836}; 2837 2838template <class _Rp, class _Class, class ..._Param> 2839struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param...) const volatile&&, true, false> 2840{ 2841 typedef _Class const volatile&& _ClassType; 2842 typedef _Rp _ReturnType; 2843 typedef _Rp (_FnType) (_Param...); 2844}; 2845 2846template <class _Rp, class _Class, class ..._Param> 2847struct __member_pointer_traits_imp<_Rp (_Class::*)(_Param..., ...) const volatile&&, true, false> 2848{ 2849 typedef _Class const volatile&& _ClassType; 2850 typedef _Rp _ReturnType; 2851 typedef _Rp (_FnType) (_Param..., ...); 2852}; 2853 2854#endif // __has_feature(cxx_reference_qualified_functions) || defined(_LIBCPP_COMPILER_GCC) 2855 2856 2857template <class _Rp, class _Class> 2858struct __member_pointer_traits_imp<_Rp _Class::*, false, true> 2859{ 2860 typedef _Class _ClassType; 2861 typedef _Rp _ReturnType; 2862}; 2863 2864template <class _MP> 2865struct __member_pointer_traits 2866 : public __member_pointer_traits_imp<typename remove_cv<_MP>::type, 2867 is_member_function_pointer<_MP>::value, 2868 is_member_object_pointer<_MP>::value> 2869{ 2870// typedef ... _ClassType; 2871// typedef ... _ReturnType; 2872// typedef ... _FnType; 2873}; 2874 2875 2876template <class _DecayedFp> 2877struct __member_pointer_class_type {}; 2878 2879template <class _Ret, class _ClassType> 2880struct __member_pointer_class_type<_Ret _ClassType::*> { 2881 typedef _ClassType type; 2882}; 2883 2884// template <class T, class... Args> struct is_constructible; 2885 2886template <class _Tp, class ..._Args> 2887struct _LIBCPP_TEMPLATE_VIS is_constructible 2888 : public integral_constant<bool, __is_constructible(_Tp, _Args...)> 2889{ }; 2890 2891#if _LIBCPP_STD_VER > 14 2892template <class _Tp, class ..._Args> 2893inline constexpr bool is_constructible_v = is_constructible<_Tp, _Args...>::value; 2894#endif 2895 2896// is_default_constructible 2897 2898template <class _Tp> 2899struct _LIBCPP_TEMPLATE_VIS is_default_constructible 2900 : public is_constructible<_Tp> 2901 {}; 2902 2903#if _LIBCPP_STD_VER > 14 2904template <class _Tp> 2905inline constexpr bool is_default_constructible_v = is_default_constructible<_Tp>::value; 2906#endif 2907 2908#ifndef _LIBCPP_CXX03_LANG 2909// First of all, we can't implement this check in C++03 mode because the {} 2910// default initialization syntax isn't valid. 2911// Second, we implement the trait in a funny manner with two defaulted template 2912// arguments to workaround Clang's PR43454. 2913template <class _Tp> 2914void __test_implicit_default_constructible(_Tp); 2915 2916template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 2917struct __is_implicitly_default_constructible 2918 : false_type 2919{ }; 2920 2921template <class _Tp> 2922struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 2923 : true_type 2924{ }; 2925 2926template <class _Tp> 2927struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 2928 : false_type 2929{ }; 2930#endif // !C++03 2931 2932// is_copy_constructible 2933 2934template <class _Tp> 2935struct _LIBCPP_TEMPLATE_VIS is_copy_constructible 2936 : public is_constructible<_Tp, 2937 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 2938 2939#if _LIBCPP_STD_VER > 14 2940template <class _Tp> 2941inline constexpr bool is_copy_constructible_v = is_copy_constructible<_Tp>::value; 2942#endif 2943 2944// is_move_constructible 2945 2946template <class _Tp> 2947struct _LIBCPP_TEMPLATE_VIS is_move_constructible 2948 : public is_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2949 {}; 2950 2951#if _LIBCPP_STD_VER > 14 2952template <class _Tp> 2953inline constexpr bool is_move_constructible_v = is_move_constructible<_Tp>::value; 2954#endif 2955 2956// is_trivially_constructible 2957 2958template <class _Tp, class... _Args> 2959struct _LIBCPP_TEMPLATE_VIS is_trivially_constructible 2960 : integral_constant<bool, __is_trivially_constructible(_Tp, _Args...)> 2961{ 2962}; 2963 2964#if _LIBCPP_STD_VER > 14 2965template <class _Tp, class... _Args> 2966inline constexpr bool is_trivially_constructible_v = is_trivially_constructible<_Tp, _Args...>::value; 2967#endif 2968 2969// is_trivially_default_constructible 2970 2971template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_default_constructible 2972 : public is_trivially_constructible<_Tp> 2973 {}; 2974 2975#if _LIBCPP_STD_VER > 14 2976template <class _Tp> 2977inline constexpr bool is_trivially_default_constructible_v = is_trivially_default_constructible<_Tp>::value; 2978#endif 2979 2980// is_trivially_copy_constructible 2981 2982template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_constructible 2983 : public is_trivially_constructible<_Tp, typename add_lvalue_reference<const _Tp>::type> 2984 {}; 2985 2986#if _LIBCPP_STD_VER > 14 2987template <class _Tp> 2988inline constexpr bool is_trivially_copy_constructible_v = is_trivially_copy_constructible<_Tp>::value; 2989#endif 2990 2991// is_trivially_move_constructible 2992 2993template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_constructible 2994 : public is_trivially_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 2995 {}; 2996 2997#if _LIBCPP_STD_VER > 14 2998template <class _Tp> 2999inline constexpr bool is_trivially_move_constructible_v = is_trivially_move_constructible<_Tp>::value; 3000#endif 3001 3002// is_trivially_assignable 3003 3004template <class _Tp, class _Arg> 3005struct is_trivially_assignable 3006 : integral_constant<bool, __is_trivially_assignable(_Tp, _Arg)> 3007{ }; 3008 3009#if _LIBCPP_STD_VER > 14 3010template <class _Tp, class _Arg> 3011inline constexpr bool is_trivially_assignable_v = is_trivially_assignable<_Tp, _Arg>::value; 3012#endif 3013 3014// is_trivially_copy_assignable 3015 3016template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copy_assignable 3017 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3018 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3019 3020#if _LIBCPP_STD_VER > 14 3021template <class _Tp> 3022inline constexpr bool is_trivially_copy_assignable_v = is_trivially_copy_assignable<_Tp>::value; 3023#endif 3024 3025// is_trivially_move_assignable 3026 3027template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_move_assignable 3028 : public is_trivially_assignable<typename add_lvalue_reference<_Tp>::type, 3029 typename add_rvalue_reference<_Tp>::type> 3030 {}; 3031 3032#if _LIBCPP_STD_VER > 14 3033template <class _Tp> 3034inline constexpr bool is_trivially_move_assignable_v = is_trivially_move_assignable<_Tp>::value; 3035#endif 3036 3037// is_trivially_destructible 3038 3039#if __has_keyword(__is_trivially_destructible) 3040 3041template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3042 : public integral_constant<bool, __is_trivially_destructible(_Tp)> {}; 3043 3044#elif __has_feature(has_trivial_destructor) || defined(_LIBCPP_COMPILER_GCC) 3045 3046template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3047 : public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {}; 3048 3049#else 3050 3051template <class _Tp> struct __libcpp_trivial_destructor 3052 : public integral_constant<bool, is_scalar<_Tp>::value || 3053 is_reference<_Tp>::value> {}; 3054 3055template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible 3056 : public __libcpp_trivial_destructor<typename remove_all_extents<_Tp>::type> {}; 3057 3058template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible<_Tp[]> 3059 : public false_type {}; 3060 3061#endif 3062 3063#if _LIBCPP_STD_VER > 14 3064template <class _Tp> 3065inline constexpr bool is_trivially_destructible_v = is_trivially_destructible<_Tp>::value; 3066#endif 3067 3068// is_nothrow_constructible 3069 3070#if __has_keyword(__is_nothrow_constructible) 3071 3072template <class _Tp, class... _Args> 3073struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3074 : public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {}; 3075 3076#else 3077 3078template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible; 3079 3080template <class _Tp, class... _Args> 3081struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/false, _Tp, _Args...> 3082 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> 3083{ 3084}; 3085 3086template <class _Tp> 3087void __implicit_conversion_to(_Tp) noexcept { } 3088 3089template <class _Tp, class _Arg> 3090struct __libcpp_is_nothrow_constructible</*is constructible*/true, /*is reference*/true, _Tp, _Arg> 3091 : public integral_constant<bool, noexcept(_VSTD::__implicit_conversion_to<_Tp>(declval<_Arg>()))> 3092{ 3093}; 3094 3095template <class _Tp, bool _IsReference, class... _Args> 3096struct __libcpp_is_nothrow_constructible</*is constructible*/false, _IsReference, _Tp, _Args...> 3097 : public false_type 3098{ 3099}; 3100 3101template <class _Tp, class... _Args> 3102struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible 3103 : __libcpp_is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, is_reference<_Tp>::value, _Tp, _Args...> 3104{ 3105}; 3106 3107template <class _Tp, size_t _Ns> 3108struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]> 3109 : __libcpp_is_nothrow_constructible<is_constructible<_Tp>::value, is_reference<_Tp>::value, _Tp> 3110{ 3111}; 3112 3113#endif // _LIBCPP_HAS_NO_NOEXCEPT 3114 3115 3116#if _LIBCPP_STD_VER > 14 3117template <class _Tp, class ..._Args> 3118inline constexpr bool is_nothrow_constructible_v = is_nothrow_constructible<_Tp, _Args...>::value; 3119#endif 3120 3121// is_nothrow_default_constructible 3122 3123template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_default_constructible 3124 : public is_nothrow_constructible<_Tp> 3125 {}; 3126 3127#if _LIBCPP_STD_VER > 14 3128template <class _Tp> 3129inline constexpr bool is_nothrow_default_constructible_v = is_nothrow_default_constructible<_Tp>::value; 3130#endif 3131 3132// is_nothrow_copy_constructible 3133 3134template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_constructible 3135 : public is_nothrow_constructible<_Tp, 3136 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3137 3138#if _LIBCPP_STD_VER > 14 3139template <class _Tp> 3140inline constexpr bool is_nothrow_copy_constructible_v = is_nothrow_copy_constructible<_Tp>::value; 3141#endif 3142 3143// is_nothrow_move_constructible 3144 3145template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_move_constructible 3146 : public is_nothrow_constructible<_Tp, typename add_rvalue_reference<_Tp>::type> 3147 {}; 3148 3149#if _LIBCPP_STD_VER > 14 3150template <class _Tp> 3151inline constexpr bool is_nothrow_move_constructible_v = is_nothrow_move_constructible<_Tp>::value; 3152#endif 3153 3154// is_nothrow_assignable 3155 3156#if __has_keyword(__is_nothrow_assignable) 3157 3158template <class _Tp, class _Arg> 3159struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3160 : public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {}; 3161 3162#else 3163 3164template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable; 3165 3166template <class _Tp, class _Arg> 3167struct __libcpp_is_nothrow_assignable<false, _Tp, _Arg> 3168 : public false_type 3169{ 3170}; 3171 3172template <class _Tp, class _Arg> 3173struct __libcpp_is_nothrow_assignable<true, _Tp, _Arg> 3174 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Arg>()) > 3175{ 3176}; 3177 3178template <class _Tp, class _Arg> 3179struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable 3180 : public __libcpp_is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg> 3181{ 3182}; 3183 3184#endif // _LIBCPP_HAS_NO_NOEXCEPT 3185 3186#if _LIBCPP_STD_VER > 14 3187template <class _Tp, class _Arg> 3188inline constexpr bool is_nothrow_assignable_v = is_nothrow_assignable<_Tp, _Arg>::value; 3189#endif 3190 3191// is_nothrow_copy_assignable 3192 3193template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_copy_assignable 3194 : public is_nothrow_assignable<typename add_lvalue_reference<_Tp>::type, 3195 typename add_lvalue_reference<typename add_const<_Tp>::type>::type> {}; 3196 3197#if _LIBCPP_STD_VER > 14 3198template <class _Tp> 3199inline constexpr bool is_nothrow_copy_assignable_v = 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 3210template <class _Tp> 3211inline constexpr bool is_nothrow_move_assignable_v = is_nothrow_move_assignable<_Tp>::value; 3212#endif 3213 3214// is_nothrow_destructible 3215 3216#if !defined(_LIBCPP_CXX03_LANG) 3217 3218template <bool, class _Tp> struct __libcpp_is_nothrow_destructible; 3219 3220template <class _Tp> 3221struct __libcpp_is_nothrow_destructible<false, _Tp> 3222 : public false_type 3223{ 3224}; 3225 3226template <class _Tp> 3227struct __libcpp_is_nothrow_destructible<true, _Tp> 3228 : public integral_constant<bool, noexcept(declval<_Tp>().~_Tp()) > 3229{ 3230}; 3231 3232template <class _Tp> 3233struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3234 : public __libcpp_is_nothrow_destructible<is_destructible<_Tp>::value, _Tp> 3235{ 3236}; 3237 3238template <class _Tp, size_t _Ns> 3239struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[_Ns]> 3240 : public is_nothrow_destructible<_Tp> 3241{ 3242}; 3243 3244template <class _Tp> 3245struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&> 3246 : public true_type 3247{ 3248}; 3249 3250template <class _Tp> 3251struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp&&> 3252 : public true_type 3253{ 3254}; 3255 3256#else 3257 3258template <class _Tp> struct __libcpp_nothrow_destructor 3259 : public integral_constant<bool, is_scalar<_Tp>::value || 3260 is_reference<_Tp>::value> {}; 3261 3262template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible 3263 : public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {}; 3264 3265template <class _Tp> 3266struct _LIBCPP_TEMPLATE_VIS is_nothrow_destructible<_Tp[]> 3267 : public false_type {}; 3268 3269#endif 3270 3271#if _LIBCPP_STD_VER > 14 3272template <class _Tp> 3273inline constexpr bool is_nothrow_destructible_v = is_nothrow_destructible<_Tp>::value; 3274#endif 3275 3276// is_pod 3277 3278#if __has_feature(is_pod) || defined(_LIBCPP_COMPILER_GCC) 3279 3280template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3281 : public integral_constant<bool, __is_pod(_Tp)> {}; 3282 3283#else 3284 3285template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_pod 3286 : public integral_constant<bool, is_trivially_default_constructible<_Tp>::value && 3287 is_trivially_copy_constructible<_Tp>::value && 3288 is_trivially_copy_assignable<_Tp>::value && 3289 is_trivially_destructible<_Tp>::value> {}; 3290 3291#endif 3292 3293#if _LIBCPP_STD_VER > 14 3294template <class _Tp> 3295inline constexpr bool is_pod_v = is_pod<_Tp>::value; 3296#endif 3297 3298// is_literal_type; 3299 3300#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3301template <class _Tp> struct _LIBCPP_TEMPLATE_VIS _LIBCPP_DEPRECATED_IN_CXX17 is_literal_type 3302 : public integral_constant<bool, __is_literal_type(_Tp)> 3303 {}; 3304 3305#if _LIBCPP_STD_VER > 14 3306template <class _Tp> 3307_LIBCPP_DEPRECATED_IN_CXX17 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value; 3308#endif // _LIBCPP_STD_VER > 14 3309#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3310 3311// is_standard_layout; 3312 3313template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_standard_layout 3314#if __has_feature(is_standard_layout) || defined(_LIBCPP_COMPILER_GCC) 3315 : public integral_constant<bool, __is_standard_layout(_Tp)> 3316#else 3317 : integral_constant<bool, is_scalar<typename remove_all_extents<_Tp>::type>::value> 3318#endif 3319 {}; 3320 3321#if _LIBCPP_STD_VER > 14 3322template <class _Tp> 3323inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value; 3324#endif 3325 3326// is_trivially_copyable; 3327 3328template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_copyable 3329 : public integral_constant<bool, __is_trivially_copyable(_Tp)> 3330 {}; 3331 3332#if _LIBCPP_STD_VER > 14 3333template <class _Tp> 3334inline constexpr bool is_trivially_copyable_v = is_trivially_copyable<_Tp>::value; 3335#endif 3336 3337// is_trivial; 3338 3339template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivial 3340#if __has_feature(is_trivial) || defined(_LIBCPP_COMPILER_GCC) 3341 : public integral_constant<bool, __is_trivial(_Tp)> 3342#else 3343 : integral_constant<bool, is_trivially_copyable<_Tp>::value && 3344 is_trivially_default_constructible<_Tp>::value> 3345#endif 3346 {}; 3347 3348#if _LIBCPP_STD_VER > 14 3349template <class _Tp> 3350inline constexpr bool is_trivial_v = is_trivial<_Tp>::value; 3351#endif 3352 3353template <class _Tp> struct __is_reference_wrapper_impl : public false_type {}; 3354template <class _Tp> struct __is_reference_wrapper_impl<reference_wrapper<_Tp> > : public true_type {}; 3355template <class _Tp> struct __is_reference_wrapper 3356 : public __is_reference_wrapper_impl<typename remove_cv<_Tp>::type> {}; 3357 3358#ifndef _LIBCPP_CXX03_LANG 3359 3360template <class _Fp, class _A0, 3361 class _DecayFp = typename decay<_Fp>::type, 3362 class _DecayA0 = typename decay<_A0>::type, 3363 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3364using __enable_if_bullet1 = typename enable_if 3365 < 3366 is_member_function_pointer<_DecayFp>::value 3367 && is_base_of<_ClassT, _DecayA0>::value 3368 >::type; 3369 3370template <class _Fp, class _A0, 3371 class _DecayFp = typename decay<_Fp>::type, 3372 class _DecayA0 = typename decay<_A0>::type> 3373using __enable_if_bullet2 = typename enable_if 3374 < 3375 is_member_function_pointer<_DecayFp>::value 3376 && __is_reference_wrapper<_DecayA0>::value 3377 >::type; 3378 3379template <class _Fp, class _A0, 3380 class _DecayFp = typename decay<_Fp>::type, 3381 class _DecayA0 = typename decay<_A0>::type, 3382 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3383using __enable_if_bullet3 = typename enable_if 3384 < 3385 is_member_function_pointer<_DecayFp>::value 3386 && !is_base_of<_ClassT, _DecayA0>::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_bullet4 = typename enable_if 3395 < 3396 is_member_object_pointer<_DecayFp>::value 3397 && is_base_of<_ClassT, _DecayA0>::value 3398 >::type; 3399 3400template <class _Fp, class _A0, 3401 class _DecayFp = typename decay<_Fp>::type, 3402 class _DecayA0 = typename decay<_A0>::type> 3403using __enable_if_bullet5 = typename enable_if 3404 < 3405 is_member_object_pointer<_DecayFp>::value 3406 && __is_reference_wrapper<_DecayA0>::value 3407 >::type; 3408 3409template <class _Fp, class _A0, 3410 class _DecayFp = typename decay<_Fp>::type, 3411 class _DecayA0 = typename decay<_A0>::type, 3412 class _ClassT = typename __member_pointer_class_type<_DecayFp>::type> 3413using __enable_if_bullet6 = typename enable_if 3414 < 3415 is_member_object_pointer<_DecayFp>::value 3416 && !is_base_of<_ClassT, _DecayA0>::value 3417 && !__is_reference_wrapper<_DecayA0>::value 3418 >::type; 3419 3420// __invoke forward declarations 3421 3422// fall back - none of the bullets 3423 3424template <class ..._Args> 3425auto __invoke(__any, _Args&& ...__args) -> __nat; 3426 3427// bullets 1, 2 and 3 3428 3429template <class _Fp, class _A0, class ..._Args, 3430 class = __enable_if_bullet1<_Fp, _A0>> 3431inline _LIBCPP_INLINE_VISIBILITY 3432constexpr auto 3433__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3434 noexcept(noexcept((static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...))) 3435 -> decltype( (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...)) 3436 { return (static_cast<_A0&&>(__a0).*__f)(static_cast<_Args&&>(__args)...); } 3437 3438template <class _Fp, class _A0, class ..._Args, 3439 class = __enable_if_bullet2<_Fp, _A0>> 3440inline _LIBCPP_INLINE_VISIBILITY 3441constexpr auto 3442__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3443 noexcept(noexcept((__a0.get().*__f)(static_cast<_Args&&>(__args)...))) 3444 -> decltype( (__a0.get().*__f)(static_cast<_Args&&>(__args)...)) 3445 { return (__a0.get().*__f)(static_cast<_Args&&>(__args)...); } 3446 3447template <class _Fp, class _A0, class ..._Args, 3448 class = __enable_if_bullet3<_Fp, _A0>> 3449inline _LIBCPP_INLINE_VISIBILITY 3450constexpr auto 3451__invoke(_Fp&& __f, _A0&& __a0, _Args&& ...__args) 3452 noexcept(noexcept(((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...))) 3453 -> decltype( ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...)) 3454 { return ((*static_cast<_A0&&>(__a0)).*__f)(static_cast<_Args&&>(__args)...); } 3455 3456// bullets 4, 5 and 6 3457 3458template <class _Fp, class _A0, 3459 class = __enable_if_bullet4<_Fp, _A0>> 3460inline _LIBCPP_INLINE_VISIBILITY 3461constexpr auto 3462__invoke(_Fp&& __f, _A0&& __a0) 3463 noexcept(noexcept(static_cast<_A0&&>(__a0).*__f)) 3464 -> decltype( static_cast<_A0&&>(__a0).*__f) 3465 { return static_cast<_A0&&>(__a0).*__f; } 3466 3467template <class _Fp, class _A0, 3468 class = __enable_if_bullet5<_Fp, _A0>> 3469inline _LIBCPP_INLINE_VISIBILITY 3470constexpr auto 3471__invoke(_Fp&& __f, _A0&& __a0) 3472 noexcept(noexcept(__a0.get().*__f)) 3473 -> decltype( __a0.get().*__f) 3474 { return __a0.get().*__f; } 3475 3476template <class _Fp, class _A0, 3477 class = __enable_if_bullet6<_Fp, _A0>> 3478inline _LIBCPP_INLINE_VISIBILITY 3479constexpr auto 3480__invoke(_Fp&& __f, _A0&& __a0) 3481 noexcept(noexcept((*static_cast<_A0&&>(__a0)).*__f)) 3482 -> decltype( (*static_cast<_A0&&>(__a0)).*__f) 3483 { return (*static_cast<_A0&&>(__a0)).*__f; } 3484 3485// bullet 7 3486 3487template <class _Fp, class ..._Args> 3488inline _LIBCPP_INLINE_VISIBILITY 3489constexpr auto 3490__invoke(_Fp&& __f, _Args&& ...__args) 3491 noexcept(noexcept(static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...))) 3492 -> decltype( static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...)) 3493 { return static_cast<_Fp&&>(__f)(static_cast<_Args&&>(__args)...); } 3494 3495// __invokable 3496template <class _Ret, class _Fp, class ..._Args> 3497struct __invokable_r 3498{ 3499 template <class _XFp, class ..._XArgs> 3500 static auto __try_call(int) -> decltype( 3501 _VSTD::__invoke(declval<_XFp>(), declval<_XArgs>()...)); 3502 template <class _XFp, class ..._XArgs> 3503 static __nat __try_call(...); 3504 3505 // FIXME: Check that _Ret, _Fp, and _Args... are all complete types, cv void, 3506 // or incomplete array types as required by the standard. 3507 using _Result = decltype(__try_call<_Fp, _Args...>(0)); 3508 3509 using type = 3510 typename conditional< 3511 _IsNotSame<_Result, __nat>::value, 3512 typename conditional< 3513 is_void<_Ret>::value, 3514 true_type, 3515 is_convertible<_Result, _Ret> 3516 >::type, 3517 false_type 3518 >::type; 3519 static const bool value = type::value; 3520}; 3521template <class _Fp, class ..._Args> 3522using __invokable = __invokable_r<void, _Fp, _Args...>; 3523 3524template <bool _IsInvokable, bool _IsCVVoid, class _Ret, class _Fp, class ..._Args> 3525struct __nothrow_invokable_r_imp { 3526 static const bool value = false; 3527}; 3528 3529template <class _Ret, class _Fp, class ..._Args> 3530struct __nothrow_invokable_r_imp<true, false, _Ret, _Fp, _Args...> 3531{ 3532 typedef __nothrow_invokable_r_imp _ThisT; 3533 3534 template <class _Tp> 3535 static void __test_noexcept(_Tp) noexcept; 3536 3537 static const bool value = noexcept(_ThisT::__test_noexcept<_Ret>( 3538 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...))); 3539}; 3540 3541template <class _Ret, class _Fp, class ..._Args> 3542struct __nothrow_invokable_r_imp<true, true, _Ret, _Fp, _Args...> 3543{ 3544 static const bool value = noexcept( 3545 _VSTD::__invoke(declval<_Fp>(), declval<_Args>()...)); 3546}; 3547 3548template <class _Ret, class _Fp, class ..._Args> 3549using __nothrow_invokable_r = 3550 __nothrow_invokable_r_imp< 3551 __invokable_r<_Ret, _Fp, _Args...>::value, 3552 is_void<_Ret>::value, 3553 _Ret, _Fp, _Args... 3554 >; 3555 3556template <class _Fp, class ..._Args> 3557using __nothrow_invokable = 3558 __nothrow_invokable_r_imp< 3559 __invokable<_Fp, _Args...>::value, 3560 true, void, _Fp, _Args... 3561 >; 3562 3563template <class _Fp, class ..._Args> 3564struct __invoke_of 3565 : public enable_if< 3566 __invokable<_Fp, _Args...>::value, 3567 typename __invokable_r<void, _Fp, _Args...>::_Result> 3568{ 3569}; 3570 3571#endif // _LIBCPP_CXX03_LANG 3572 3573// result_of 3574 3575#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3576template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 3577 3578#ifndef _LIBCPP_CXX03_LANG 3579 3580template <class _Fp, class ..._Args> 3581class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 3582 : public __invoke_of<_Fp, _Args...> 3583{ 3584}; 3585 3586#else // C++03 3587 3588template <class _Fn, bool, bool> 3589class __result_of 3590{ 3591}; 3592 3593template <class _Fn, class ..._Args> 3594class __result_of<_Fn(_Args...), true, false> 3595{ 3596public: 3597 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 3598}; 3599 3600template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 3601struct __result_of_mp; 3602 3603// member function pointer 3604 3605template <class _MP, class _Tp> 3606struct __result_of_mp<_MP, _Tp, true> 3607{ 3608 using type = typename __member_pointer_traits<_MP>::_ReturnType; 3609}; 3610 3611// member data pointer 3612 3613template <class _MP, class _Tp, bool> 3614struct __result_of_mdp; 3615 3616template <class _Rp, class _Class, class _Tp> 3617struct __result_of_mdp<_Rp _Class::*, _Tp, false> 3618{ 3619 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 3620}; 3621 3622template <class _Rp, class _Class, class _Tp> 3623struct __result_of_mdp<_Rp _Class::*, _Tp, true> 3624{ 3625 using type = typename __apply_cv<_Tp, _Rp>::type&; 3626}; 3627 3628template <class _Rp, class _Class, class _Tp> 3629struct __result_of_mp<_Rp _Class::*, _Tp, false> 3630 : public __result_of_mdp<_Rp _Class::*, _Tp, 3631 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 3632{ 3633}; 3634 3635template <class _Fn, class _Tp> 3636class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 3637 : public __result_of_mp<typename remove_reference<_Fn>::type, 3638 _Tp, 3639 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 3640{ 3641}; 3642 3643template <class _Fn, class _Tp, class ..._Args> 3644class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 3645 : public __result_of_mp<typename remove_reference<_Fn>::type, 3646 _Tp, 3647 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 3648{ 3649}; 3650 3651template <class _Fn, class ..._Args> 3652class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 3653 : public __result_of<_Fn(_Args...), 3654 is_class<typename remove_reference<_Fn>::type>::value || 3655 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 3656 is_member_pointer<typename remove_reference<_Fn>::type>::value 3657 > 3658{ 3659}; 3660 3661#endif // C++03 3662 3663#if _LIBCPP_STD_VER > 11 3664template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 3665#endif // _LIBCPP_STD_VER > 11 3666#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 3667 3668#if _LIBCPP_STD_VER > 14 3669 3670// invoke_result 3671 3672template <class _Fn, class... _Args> 3673struct _LIBCPP_TEMPLATE_VIS invoke_result 3674 : __invoke_of<_Fn, _Args...> 3675{ 3676}; 3677 3678template <class _Fn, class... _Args> 3679using invoke_result_t = typename invoke_result<_Fn, _Args...>::type; 3680 3681// is_invocable 3682 3683template <class _Fn, class ..._Args> 3684struct _LIBCPP_TEMPLATE_VIS is_invocable 3685 : integral_constant<bool, __invokable<_Fn, _Args...>::value> {}; 3686 3687template <class _Ret, class _Fn, class ..._Args> 3688struct _LIBCPP_TEMPLATE_VIS is_invocable_r 3689 : integral_constant<bool, __invokable_r<_Ret, _Fn, _Args...>::value> {}; 3690 3691template <class _Fn, class ..._Args> 3692inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value; 3693 3694template <class _Ret, class _Fn, class ..._Args> 3695inline constexpr bool is_invocable_r_v = is_invocable_r<_Ret, _Fn, _Args...>::value; 3696 3697// is_nothrow_invocable 3698 3699template <class _Fn, class ..._Args> 3700struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable 3701 : integral_constant<bool, __nothrow_invokable<_Fn, _Args...>::value> {}; 3702 3703template <class _Ret, class _Fn, class ..._Args> 3704struct _LIBCPP_TEMPLATE_VIS is_nothrow_invocable_r 3705 : integral_constant<bool, __nothrow_invokable_r<_Ret, _Fn, _Args...>::value> {}; 3706 3707template <class _Fn, class ..._Args> 3708inline constexpr bool is_nothrow_invocable_v = is_nothrow_invocable<_Fn, _Args...>::value; 3709 3710template <class _Ret, class _Fn, class ..._Args> 3711inline constexpr bool is_nothrow_invocable_r_v = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value; 3712 3713#endif // _LIBCPP_STD_VER > 14 3714 3715// __swappable 3716 3717template <class _Tp> struct __is_swappable; 3718template <class _Tp> struct __is_nothrow_swappable; 3719 3720 3721#ifndef _LIBCPP_CXX03_LANG 3722template <class _Tp> 3723using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 3724#else 3725template <class> 3726using __swap_result_t = void; 3727#endif 3728 3729template <class _Tp> 3730inline _LIBCPP_INLINE_VISIBILITY 3731_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 3732swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 3733 is_nothrow_move_assignable<_Tp>::value); 3734 3735template<class _Tp, size_t _Np> 3736inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 3737typename enable_if< 3738 __is_swappable<_Tp>::value 3739>::type 3740swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 3741 3742namespace __detail 3743{ 3744// ALL generic swap overloads MUST already have a declaration available at this point. 3745 3746template <class _Tp, class _Up = _Tp, 3747 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 3748struct __swappable_with 3749{ 3750 template <class _LHS, class _RHS> 3751 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 3752 __test_swap(int); 3753 template <class, class> 3754 static __nat __test_swap(long); 3755 3756 // Extra parens are needed for the C++03 definition of decltype. 3757 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 3758 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 3759 3760 static const bool value = _IsNotSame<__swap1, __nat>::value 3761 && _IsNotSame<__swap2, __nat>::value; 3762}; 3763 3764template <class _Tp, class _Up> 3765struct __swappable_with<_Tp, _Up, false> : false_type {}; 3766 3767template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 3768struct __nothrow_swappable_with { 3769 static const bool value = 3770#ifndef _LIBCPP_HAS_NO_NOEXCEPT 3771 noexcept(swap(declval<_Tp>(), declval<_Up>())) 3772 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 3773#else 3774 false; 3775#endif 3776}; 3777 3778template <class _Tp, class _Up> 3779struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 3780 3781} // namespace __detail 3782 3783template <class _Tp> 3784struct __is_swappable 3785 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 3786{ 3787}; 3788 3789template <class _Tp> 3790struct __is_nothrow_swappable 3791 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 3792{ 3793}; 3794 3795#if _LIBCPP_STD_VER > 14 3796 3797template <class _Tp, class _Up> 3798struct _LIBCPP_TEMPLATE_VIS is_swappable_with 3799 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 3800{ 3801}; 3802 3803template <class _Tp> 3804struct _LIBCPP_TEMPLATE_VIS is_swappable 3805 : public conditional< 3806 __is_referenceable<_Tp>::value, 3807 is_swappable_with< 3808 typename add_lvalue_reference<_Tp>::type, 3809 typename add_lvalue_reference<_Tp>::type>, 3810 false_type 3811 >::type 3812{ 3813}; 3814 3815template <class _Tp, class _Up> 3816struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 3817 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 3818{ 3819}; 3820 3821template <class _Tp> 3822struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 3823 : public conditional< 3824 __is_referenceable<_Tp>::value, 3825 is_nothrow_swappable_with< 3826 typename add_lvalue_reference<_Tp>::type, 3827 typename add_lvalue_reference<_Tp>::type>, 3828 false_type 3829 >::type 3830{ 3831}; 3832 3833template <class _Tp, class _Up> 3834inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 3835 3836template <class _Tp> 3837inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 3838 3839template <class _Tp, class _Up> 3840inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 3841 3842template <class _Tp> 3843inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 3844 3845#endif // _LIBCPP_STD_VER > 14 3846 3847template <class _Tp, bool = is_enum<_Tp>::value> struct __underlying_type_impl; 3848 3849template <class _Tp> 3850struct __underlying_type_impl<_Tp, false> {}; 3851 3852template <class _Tp> 3853struct __underlying_type_impl<_Tp, true> 3854{ 3855 typedef __underlying_type(_Tp) type; 3856}; 3857 3858template <class _Tp> 3859struct underlying_type : __underlying_type_impl<_Tp, is_enum<_Tp>::value> {}; 3860 3861#if _LIBCPP_STD_VER > 11 3862template <class _Tp> using underlying_type_t = typename underlying_type<_Tp>::type; 3863#endif 3864 3865template <class _Tp, bool = is_enum<_Tp>::value> 3866struct __sfinae_underlying_type 3867{ 3868 typedef typename underlying_type<_Tp>::type type; 3869 typedef decltype(((type)1) + 0) __promoted_type; 3870}; 3871 3872template <class _Tp> 3873struct __sfinae_underlying_type<_Tp, false> {}; 3874 3875inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3876int __convert_to_integral(int __val) { return __val; } 3877 3878inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3879unsigned __convert_to_integral(unsigned __val) { return __val; } 3880 3881inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3882long __convert_to_integral(long __val) { return __val; } 3883 3884inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3885unsigned long __convert_to_integral(unsigned long __val) { return __val; } 3886 3887inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3888long long __convert_to_integral(long long __val) { return __val; } 3889 3890inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3891unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 3892 3893template<typename _Fp> 3894inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3895typename enable_if<is_floating_point<_Fp>::value, long long>::type 3896 __convert_to_integral(_Fp __val) { return __val; } 3897 3898#ifndef _LIBCPP_HAS_NO_INT128 3899inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3900__int128_t __convert_to_integral(__int128_t __val) { return __val; } 3901 3902inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3903__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 3904#endif 3905 3906template <class _Tp> 3907inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3908typename __sfinae_underlying_type<_Tp>::__promoted_type 3909__convert_to_integral(_Tp __val) { return __val; } 3910 3911// is_scoped_enum [meta.unary.prop] 3912 3913#if _LIBCPP_STD_VER > 20 3914template <class _Tp, bool = is_enum_v<_Tp> > 3915struct __is_scoped_enum_helper : false_type {}; 3916 3917template <class _Tp> 3918struct __is_scoped_enum_helper<_Tp, true> 3919 : public bool_constant<!is_convertible_v<_Tp, underlying_type_t<_Tp> > > {}; 3920 3921template <class _Tp> 3922struct _LIBCPP_TEMPLATE_VIS is_scoped_enum 3923 : public __is_scoped_enum_helper<_Tp> {}; 3924 3925template <class _Tp> 3926inline constexpr bool is_scoped_enum_v = is_scoped_enum<_Tp>::value; 3927#endif 3928 3929#if _LIBCPP_STD_VER > 14 3930 3931template <class... _Args> 3932struct conjunction : _And<_Args...> {}; 3933template<class... _Args> 3934inline constexpr bool conjunction_v = conjunction<_Args...>::value; 3935 3936template <class... _Args> 3937struct disjunction : _Or<_Args...> {}; 3938template<class... _Args> 3939inline constexpr bool disjunction_v = disjunction<_Args...>::value; 3940 3941template <class _Tp> 3942struct negation : _Not<_Tp> {}; 3943template<class _Tp> 3944inline constexpr bool negation_v = negation<_Tp>::value; 3945#endif // _LIBCPP_STD_VER > 14 3946 3947// These traits are used in __tree and __hash_table 3948struct __extract_key_fail_tag {}; 3949struct __extract_key_self_tag {}; 3950struct __extract_key_first_tag {}; 3951 3952template <class _ValTy, class _Key, 3953 class _RawValTy = typename __unconstref<_ValTy>::type> 3954struct __can_extract_key 3955 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 3956 __extract_key_fail_tag>::type {}; 3957 3958template <class _Pair, class _Key, class _First, class _Second> 3959struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 3960 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 3961 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 3962 3963// __can_extract_map_key uses true_type/false_type instead of the tags. 3964// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 3965// and _ValTy == _Key. 3966template <class _ValTy, class _Key, class _ContainerValueTy, 3967 class _RawValTy = typename __unconstref<_ValTy>::type> 3968struct __can_extract_map_key 3969 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 3970 3971// This specialization returns __extract_key_fail_tag for non-map containers 3972// because _Key == _ContainerValueTy 3973template <class _ValTy, class _Key, class _RawValTy> 3974struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 3975 : false_type {}; 3976 3977#if _LIBCPP_STD_VER > 17 3978_LIBCPP_INLINE_VISIBILITY 3979inline constexpr bool is_constant_evaluated() noexcept { 3980 return __builtin_is_constant_evaluated(); 3981} 3982#endif 3983 3984inline _LIBCPP_CONSTEXPR 3985bool __libcpp_is_constant_evaluated() _NOEXCEPT { return __builtin_is_constant_evaluated(); } 3986 3987template <class _CharT> 3988using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 3989 3990template<class _Tp> 3991using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 3992 3993#if _LIBCPP_STD_VER > 17 3994template<bool _Const, class _Tp> 3995using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 3996#endif // _LIBCPP_STD_VER > 17 3997 3998_LIBCPP_END_NAMESPACE_STD 3999 4000#endif // _LIBCPP_TYPE_TRAITS 4001