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#include <__assert> // all public C++ headers provide the assertion handler 420#include <__config> 421#include <__functional/invoke.h> 422#include <__type_traits/add_const.h> 423#include <__type_traits/add_cv.h> 424#include <__type_traits/add_lvalue_reference.h> 425#include <__type_traits/add_pointer.h> 426#include <__type_traits/add_rvalue_reference.h> 427#include <__type_traits/add_volatile.h> 428#include <__type_traits/alignment_of.h> 429#include <__type_traits/apply_cv.h> 430#include <__type_traits/conditional.h> 431#include <__type_traits/conjunction.h> 432#include <__type_traits/decay.h> 433#include <__type_traits/disjunction.h> 434#include <__type_traits/enable_if.h> 435#include <__type_traits/extent.h> 436#include <__type_traits/has_unique_object_representation.h> 437#include <__type_traits/has_virtual_destructor.h> 438#include <__type_traits/integral_constant.h> 439#include <__type_traits/is_abstract.h> 440#include <__type_traits/is_aggregate.h> 441#include <__type_traits/is_arithmetic.h> 442#include <__type_traits/is_array.h> 443#include <__type_traits/is_assignable.h> 444#include <__type_traits/is_base_of.h> 445#include <__type_traits/is_bounded_array.h> 446#include <__type_traits/is_callable.h> 447#include <__type_traits/is_class.h> 448#include <__type_traits/is_compound.h> 449#include <__type_traits/is_const.h> 450#include <__type_traits/is_constant_evaluated.h> 451#include <__type_traits/is_constructible.h> 452#include <__type_traits/is_convertible.h> 453#include <__type_traits/is_copy_assignable.h> 454#include <__type_traits/is_copy_constructible.h> 455#include <__type_traits/is_default_constructible.h> 456#include <__type_traits/is_destructible.h> 457#include <__type_traits/is_empty.h> 458#include <__type_traits/is_enum.h> 459#include <__type_traits/is_final.h> 460#include <__type_traits/is_floating_point.h> 461#include <__type_traits/is_function.h> 462#include <__type_traits/is_fundamental.h> 463#include <__type_traits/is_integral.h> 464#include <__type_traits/is_literal_type.h> 465#include <__type_traits/is_member_function_pointer.h> 466#include <__type_traits/is_member_object_pointer.h> 467#include <__type_traits/is_member_pointer.h> 468#include <__type_traits/is_move_assignable.h> 469#include <__type_traits/is_move_constructible.h> 470#include <__type_traits/is_nothrow_assignable.h> 471#include <__type_traits/is_nothrow_constructible.h> 472#include <__type_traits/is_nothrow_copy_assignable.h> 473#include <__type_traits/is_nothrow_copy_constructible.h> 474#include <__type_traits/is_nothrow_default_constructible.h> 475#include <__type_traits/is_nothrow_destructible.h> 476#include <__type_traits/is_nothrow_move_assignable.h> 477#include <__type_traits/is_nothrow_move_constructible.h> 478#include <__type_traits/is_null_pointer.h> 479#include <__type_traits/is_object.h> 480#include <__type_traits/is_pod.h> 481#include <__type_traits/is_pointer.h> 482#include <__type_traits/is_polymorphic.h> 483#include <__type_traits/is_reference.h> 484#include <__type_traits/is_reference_wrapper.h> 485#include <__type_traits/is_referenceable.h> 486#include <__type_traits/is_same.h> 487#include <__type_traits/is_scalar.h> 488#include <__type_traits/is_scoped_enum.h> 489#include <__type_traits/is_signed.h> 490#include <__type_traits/is_standard_layout.h> 491#include <__type_traits/is_trivial.h> 492#include <__type_traits/is_trivially_assignable.h> 493#include <__type_traits/is_trivially_constructible.h> 494#include <__type_traits/is_trivially_copy_assignable.h> 495#include <__type_traits/is_trivially_copy_constructible.h> 496#include <__type_traits/is_trivially_copyable.h> 497#include <__type_traits/is_trivially_default_constructible.h> 498#include <__type_traits/is_trivially_destructible.h> 499#include <__type_traits/is_trivially_move_assignable.h> 500#include <__type_traits/is_trivially_move_constructible.h> 501#include <__type_traits/is_unbounded_array.h> 502#include <__type_traits/is_union.h> 503#include <__type_traits/is_unsigned.h> 504#include <__type_traits/is_void.h> 505#include <__type_traits/is_volatile.h> 506#include <__type_traits/negation.h> 507#include <__type_traits/rank.h> 508#include <__type_traits/remove_all_extents.h> 509#include <__type_traits/remove_const.h> 510#include <__type_traits/remove_cv.h> 511#include <__type_traits/remove_extent.h> 512#include <__type_traits/remove_pointer.h> 513#include <__type_traits/remove_reference.h> 514#include <__type_traits/remove_volatile.h> 515#include <__type_traits/type_identity.h> 516#include <__type_traits/underlying_type.h> 517#include <__type_traits/void_t.h> 518#include <__utility/declval.h> 519#include <cstddef> 520#include <cstdint> 521#include <version> 522 523#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 524# pragma GCC system_header 525#endif 526 527_LIBCPP_BEGIN_NAMESPACE_STD 528 529template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 530template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 531 532template <template <class...> class _Func, class ..._Args> 533struct _Lazy : _Func<_Args...> {}; 534 535// Member detector base 536 537template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 538true_type __sfinae_test_impl(int); 539template <template <class...> class, class ...> 540false_type __sfinae_test_impl(...); 541 542template <template <class ...> class _Templ, class ..._Args> 543using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 544 545template <class _Tp, bool> 546struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 547 548// is_same 549 550template <class _Tp> 551using __test_for_primary_template = __enable_if_t< 552 _IsSame<_Tp, typename _Tp::__primary_template>::value 553 >; 554template <class _Tp> 555using __is_primary_template = _IsValidExpansion< 556 __test_for_primary_template, _Tp 557 >; 558 559// is_integral 560 561// [basic.fundamental] defines five standard signed integer types; 562// __int128_t is an extended signed integer type. 563// The signed and unsigned integer types, plus bool and the 564// five types with "char" in their name, compose the "integral" types. 565 566template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 567template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 568template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 569template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 570template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 571template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 572#ifndef _LIBCPP_HAS_NO_INT128 573template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 574#endif 575 576template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 577template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 578template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 579template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 580template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 581template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 582#ifndef _LIBCPP_HAS_NO_INT128 583template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 584#endif 585 586template <class _Tp> 587struct __unconstref { 588 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 589}; 590 591template <class _Tp> 592using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type; 593 594// __is_same_uncvref 595 596template <class _Tp, class _Up> 597struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {}; 598 599#if _LIBCPP_STD_VER > 17 600// remove_cvref - same as __uncvref 601template <class _Tp> 602struct remove_cvref { 603 using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>; 604}; 605 606template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 607#endif 608 609// is_nothrow_convertible 610 611#if _LIBCPP_STD_VER > 17 612 613template <typename _Tp> 614static void __test_noexcept(_Tp) noexcept; 615 616template<typename _Fm, typename _To> 617static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 618__is_nothrow_convertible_test(); 619 620template <typename _Fm, typename _To> 621struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 622{ }; 623 624template <typename _Fm, typename _To> 625struct is_nothrow_convertible : _Or< 626 _And<is_void<_To>, is_void<_Fm>>, 627 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 628>::type { }; 629 630template <typename _Fm, typename _To> 631inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 632 633#endif // _LIBCPP_STD_VER > 17 634 635// aligned_storage 636 637template <class _Hp, class _Tp> 638struct __type_list 639{ 640 typedef _Hp _Head; 641 typedef _Tp _Tail; 642}; 643 644template <class _Tp> 645struct __align_type 646{ 647 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 648 typedef _Tp type; 649}; 650 651struct __struct_double {long double __lx;}; 652struct __struct_double4 {double __lx[4];}; 653 654typedef 655 __type_list<__align_type<unsigned char>, 656 __type_list<__align_type<unsigned short>, 657 __type_list<__align_type<unsigned int>, 658 __type_list<__align_type<unsigned long>, 659 __type_list<__align_type<unsigned long long>, 660 __type_list<__align_type<double>, 661 __type_list<__align_type<long double>, 662 __type_list<__align_type<__struct_double>, 663 __type_list<__align_type<__struct_double4>, 664 __type_list<__align_type<int*>, 665 __nat 666 > > > > > > > > > > __all_types; 667 668template <size_t _Align> 669struct _ALIGNAS(_Align) __fallback_overaligned {}; 670 671template <class _TL, size_t _Align> struct __find_pod; 672 673template <class _Hp, size_t _Align> 674struct __find_pod<__type_list<_Hp, __nat>, _Align> 675{ 676 typedef typename conditional< 677 _Align == _Hp::value, 678 typename _Hp::type, 679 __fallback_overaligned<_Align> 680 >::type type; 681}; 682 683template <class _Hp, class _Tp, size_t _Align> 684struct __find_pod<__type_list<_Hp, _Tp>, _Align> 685{ 686 typedef typename conditional< 687 _Align == _Hp::value, 688 typename _Hp::type, 689 typename __find_pod<_Tp, _Align>::type 690 >::type type; 691}; 692 693template <class _TL, size_t _Len> struct __find_max_align; 694 695template <class _Hp, size_t _Len> 696struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 697 698template <size_t _Len, size_t _A1, size_t _A2> 699struct __select_align 700{ 701private: 702 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 703 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 704public: 705 static const size_t value = _Len < __max ? __min : __max; 706}; 707 708template <class _Hp, class _Tp, size_t _Len> 709struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 710 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 711 712template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 713struct _LIBCPP_TEMPLATE_VIS aligned_storage 714{ 715 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 716 union type 717 { 718 _Aligner __align; 719 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 720 }; 721}; 722 723#if _LIBCPP_STD_VER > 11 724template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 725 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 726#endif 727 728#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 729template <size_t _Len>\ 730struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 731{\ 732 struct _ALIGNAS(n) type\ 733 {\ 734 unsigned char __lx[(_Len + n - 1)/n * n];\ 735 };\ 736} 737 738_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 739_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 740_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 741_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 742_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 743_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 744_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 745_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 746_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 747_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 748_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 749_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 750_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 751_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 752// PE/COFF does not support alignment beyond 8192 (=0x2000) 753#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 754_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 755#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 756 757#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 758 759 760// aligned_union 761 762template <size_t _I0, size_t ..._In> 763struct __static_max; 764 765template <size_t _I0> 766struct __static_max<_I0> 767{ 768 static const size_t value = _I0; 769}; 770 771template <size_t _I0, size_t _I1, size_t ..._In> 772struct __static_max<_I0, _I1, _In...> 773{ 774 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 775 __static_max<_I1, _In...>::value; 776}; 777 778template <size_t _Len, class _Type0, class ..._Types> 779struct aligned_union 780{ 781 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 782 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 783 static const size_t __len = __static_max<_Len, sizeof(_Type0), 784 sizeof(_Types)...>::value; 785 typedef typename aligned_storage<__len, alignment_value>::type type; 786}; 787 788#if _LIBCPP_STD_VER > 11 789template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 790#endif 791 792template <class _Tp> 793struct __numeric_type 794{ 795 static void __test(...); 796 static float __test(float); 797 static double __test(char); 798 static double __test(int); 799 static double __test(unsigned); 800 static double __test(long); 801 static double __test(unsigned long); 802 static double __test(long long); 803 static double __test(unsigned long long); 804 static double __test(double); 805 static long double __test(long double); 806 807 typedef decltype(__test(declval<_Tp>())) type; 808 static const bool value = _IsNotSame<type, void>::value; 809}; 810 811template <> 812struct __numeric_type<void> 813{ 814 static const bool value = true; 815}; 816 817// __promote 818 819template <class _A1, class _A2 = void, class _A3 = void, 820 bool = __numeric_type<_A1>::value && 821 __numeric_type<_A2>::value && 822 __numeric_type<_A3>::value> 823class __promote_imp 824{ 825public: 826 static const bool value = false; 827}; 828 829template <class _A1, class _A2, class _A3> 830class __promote_imp<_A1, _A2, _A3, true> 831{ 832private: 833 typedef typename __promote_imp<_A1>::type __type1; 834 typedef typename __promote_imp<_A2>::type __type2; 835 typedef typename __promote_imp<_A3>::type __type3; 836public: 837 typedef decltype(__type1() + __type2() + __type3()) type; 838 static const bool value = true; 839}; 840 841template <class _A1, class _A2> 842class __promote_imp<_A1, _A2, void, true> 843{ 844private: 845 typedef typename __promote_imp<_A1>::type __type1; 846 typedef typename __promote_imp<_A2>::type __type2; 847public: 848 typedef decltype(__type1() + __type2()) type; 849 static const bool value = true; 850}; 851 852template <class _A1> 853class __promote_imp<_A1, void, void, true> 854{ 855public: 856 typedef typename __numeric_type<_A1>::type type; 857 static const bool value = true; 858}; 859 860template <class _A1, class _A2 = void, class _A3 = void> 861class __promote : public __promote_imp<_A1, _A2, _A3> {}; 862 863// make_signed / make_unsigned 864 865typedef 866 __type_list<signed char, 867 __type_list<signed short, 868 __type_list<signed int, 869 __type_list<signed long, 870 __type_list<signed long long, 871#ifndef _LIBCPP_HAS_NO_INT128 872 __type_list<__int128_t, 873#endif 874 __nat 875#ifndef _LIBCPP_HAS_NO_INT128 876 > 877#endif 878 > > > > > __signed_types; 879 880typedef 881 __type_list<unsigned char, 882 __type_list<unsigned short, 883 __type_list<unsigned int, 884 __type_list<unsigned long, 885 __type_list<unsigned long long, 886#ifndef _LIBCPP_HAS_NO_INT128 887 __type_list<__uint128_t, 888#endif 889 __nat 890#ifndef _LIBCPP_HAS_NO_INT128 891 > 892#endif 893 > > > > > __unsigned_types; 894 895template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 896 897template <class _Hp, class _Tp, size_t _Size> 898struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 899{ 900 typedef _LIBCPP_NODEBUG _Hp type; 901}; 902 903template <class _Hp, class _Tp, size_t _Size> 904struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 905{ 906 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 907}; 908 909template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 910struct __make_signed {}; 911 912template <class _Tp> 913struct __make_signed<_Tp, true> 914{ 915 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 916}; 917 918template <> struct __make_signed<bool, true> {}; 919template <> struct __make_signed< signed short, true> {typedef short type;}; 920template <> struct __make_signed<unsigned short, true> {typedef short type;}; 921template <> struct __make_signed< signed int, true> {typedef int type;}; 922template <> struct __make_signed<unsigned int, true> {typedef int type;}; 923template <> struct __make_signed< signed long, true> {typedef long type;}; 924template <> struct __make_signed<unsigned long, true> {typedef long type;}; 925template <> struct __make_signed< signed long long, true> {typedef long long type;}; 926template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 927#ifndef _LIBCPP_HAS_NO_INT128 928template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 929template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 930#endif 931 932template <class _Tp> 933struct _LIBCPP_TEMPLATE_VIS make_signed 934{ 935 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 936}; 937 938#if _LIBCPP_STD_VER > 11 939template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 940#endif 941 942template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 943struct __make_unsigned {}; 944 945template <class _Tp> 946struct __make_unsigned<_Tp, true> 947{ 948 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 949}; 950 951template <> struct __make_unsigned<bool, true> {}; 952template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 953template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 954template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 955template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 956template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 957template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 958template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 959template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 960#ifndef _LIBCPP_HAS_NO_INT128 961template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 962template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 963#endif 964 965template <class _Tp> 966struct _LIBCPP_TEMPLATE_VIS make_unsigned 967{ 968 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 969}; 970 971#if _LIBCPP_STD_VER > 11 972template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 973#endif 974 975#ifndef _LIBCPP_CXX03_LANG 976template <class _Tp> 977_LIBCPP_HIDE_FROM_ABI constexpr 978typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 979 return static_cast<typename make_unsigned<_Tp>::type>(__x); 980} 981#endif 982 983template <class _Tp, class _Up> 984using __copy_unsigned_t = __conditional_t<is_unsigned<_Tp>::value, typename make_unsigned<_Up>::type, _Up>; 985 986/// Helper to promote an integral to smallest 32, 64, or 128 bit representation. 987/// 988/// The restriction is the same as the integral version of to_char. 989template <class _Tp> 990#if _LIBCPP_STD_VER > 17 991 requires (is_signed_v<_Tp> || is_unsigned_v<_Tp> || is_same_v<_Tp, char>) 992#endif 993using __make_32_64_or_128_bit_t = 994 __copy_unsigned_t<_Tp, 995 __conditional_t<sizeof(_Tp) <= sizeof(int32_t), int32_t, 996 __conditional_t<sizeof(_Tp) <= sizeof(int64_t), int64_t, 997#ifndef _LIBCPP_HAS_NO_INT128 998 __conditional_t<sizeof(_Tp) <= sizeof(__int128_t), __int128_t, 999 /* else */ void> 1000#else 1001 /* else */ void 1002#endif 1003 > > 1004 >; 1005 1006#if _LIBCPP_STD_VER > 17 1007// Let COND_RES(X, Y) be: 1008template <class _Tp, class _Up> 1009using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 1010 1011template <class _Tp, class _Up, class = void> 1012struct __common_type3 {}; 1013 1014// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 1015template <class _Tp, class _Up> 1016struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 1017{ 1018 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 1019}; 1020 1021template <class _Tp, class _Up, class = void> 1022struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 1023#else 1024template <class _Tp, class _Up, class = void> 1025struct __common_type2_imp {}; 1026#endif 1027 1028// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 1029template <class _Tp, class _Up> 1030struct __common_type2_imp<_Tp, _Up, 1031 typename __void_t<decltype( 1032 true ? declval<_Tp>() : declval<_Up>() 1033 )>::type> 1034{ 1035 typedef _LIBCPP_NODEBUG typename decay<decltype( 1036 true ? declval<_Tp>() : declval<_Up>() 1037 )>::type type; 1038}; 1039 1040template <class, class = void> 1041struct __common_type_impl {}; 1042 1043// Clang provides variadic templates in C++03 as an extension. 1044#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 1045# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 1046template <class... _Tp> 1047struct __common_types; 1048template <class... _Tp> 1049struct _LIBCPP_TEMPLATE_VIS common_type; 1050#else 1051# define _LIBCPP_OPTIONAL_PACK(...) 1052struct __no_arg; 1053template <class _Tp, class _Up, class = __no_arg> 1054struct __common_types; 1055template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 1056 class _Unused = __no_arg> 1057struct common_type { 1058 static_assert(sizeof(_Unused) == 0, 1059 "common_type accepts at most 3 arguments in C++03"); 1060}; 1061#endif // _LIBCPP_CXX03_LANG 1062 1063template <class _Tp, class _Up> 1064struct __common_type_impl< 1065 __common_types<_Tp, _Up>, 1066 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1067{ 1068 typedef typename common_type<_Tp, _Up>::type type; 1069}; 1070 1071template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1072struct __common_type_impl< 1073 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 1074 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1075 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 1076 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 1077}; 1078 1079// bullet 1 - sizeof...(Tp) == 0 1080 1081template <> 1082struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 1083 1084// bullet 2 - sizeof...(Tp) == 1 1085 1086template <class _Tp> 1087struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 1088 : public common_type<_Tp, _Tp> {}; 1089 1090// bullet 3 - sizeof...(Tp) == 2 1091 1092// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 1093template <class _Tp, class _Up> 1094struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 1095 : conditional< 1096 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 1097 __common_type2_imp<_Tp, _Up>, 1098 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 1099 >::type 1100{}; 1101 1102// bullet 4 - sizeof...(Tp) > 2 1103 1104template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1105struct _LIBCPP_TEMPLATE_VIS 1106 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 1107 : __common_type_impl< 1108 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 1109 1110#undef _LIBCPP_OPTIONAL_PACK 1111 1112#if _LIBCPP_STD_VER > 11 1113template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 1114#endif 1115 1116// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 1117// top-level cv-qualifiers. 1118template <class _From, class _To> 1119struct __copy_cv 1120{ 1121 using type = _To; 1122}; 1123 1124template <class _From, class _To> 1125struct __copy_cv<const _From, _To> 1126{ 1127 using type = typename add_const<_To>::type; 1128}; 1129 1130template <class _From, class _To> 1131struct __copy_cv<volatile _From, _To> 1132{ 1133 using type = typename add_volatile<_To>::type; 1134}; 1135 1136template <class _From, class _To> 1137struct __copy_cv<const volatile _From, _To> 1138{ 1139 using type = typename add_cv<_To>::type; 1140}; 1141 1142template <class _From, class _To> 1143using __copy_cv_t = typename __copy_cv<_From, _To>::type; 1144 1145template <class _From, class _To> 1146struct __copy_cvref 1147{ 1148 using type = __copy_cv_t<_From, _To>; 1149}; 1150 1151template <class _From, class _To> 1152struct __copy_cvref<_From&, _To> 1153{ 1154 using type = typename add_lvalue_reference<__copy_cv_t<_From, _To> >::type; 1155}; 1156 1157template <class _From, class _To> 1158struct __copy_cvref<_From&&, _To> 1159{ 1160 using type = typename add_rvalue_reference<__copy_cv_t<_From, _To> >::type; 1161}; 1162 1163template <class _From, class _To> 1164using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 1165 1166 1167// common_reference 1168#if _LIBCPP_STD_VER > 17 1169// Let COND_RES(X, Y) be: 1170template <class _Xp, class _Yp> 1171using __cond_res = 1172 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 1173 1174// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 1175// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 1176// `U`. 1177// [Note: `XREF(A)` is `__xref<A>::template __apply`] 1178template <class _Tp> 1179struct __xref { 1180 template<class _Up> 1181 using __apply = __copy_cvref_t<_Tp, _Up>; 1182}; 1183 1184// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 1185// and let COMMON-REF(A, B) be: 1186template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 1187struct __common_ref; 1188 1189template<class _Xp, class _Yp> 1190using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 1191 1192template<class _Xp, class _Yp> 1193using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 1194 1195 1196// If A and B are both lvalue reference types, COMMON-REF(A, B) is 1197// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 1198template<class _Ap, class _Bp, class _Xp, class _Yp> 1199requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 1200struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 1201{ 1202 using __type = __cv_cond_res<_Xp, _Yp>; 1203}; 1204 1205// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 1206template <class _Xp, class _Yp> 1207using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 1208 1209 1210// .... If A and B are both rvalue reference types, C is well-formed, and 1211// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 1212template<class _Ap, class _Bp, class _Xp, class _Yp> 1213requires 1214 requires { typename __common_ref_C<_Xp, _Yp>; } && 1215 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 1216 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 1217struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 1218{ 1219 using __type = __common_ref_C<_Xp, _Yp>; 1220}; 1221 1222// Otherwise, let D be COMMON-REF(const X&, Y&). ... 1223template <class _Tp, class _Up> 1224using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 1225 1226// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 1227// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 1228template<class _Ap, class _Bp, class _Xp, class _Yp> 1229requires requires { typename __common_ref_D<_Xp, _Yp>; } && 1230 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 1231struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 1232{ 1233 using __type = __common_ref_D<_Xp, _Yp>; 1234}; 1235 1236// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 1237// COMMON-REF(A, B) is COMMON-REF(B, A). 1238template<class _Ap, class _Bp, class _Xp, class _Yp> 1239struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 1240 1241// Otherwise, COMMON-REF(A, B) is ill-formed. 1242template<class _Ap, class _Bp, class _Xp, class _Yp> 1243struct __common_ref {}; 1244 1245// Note C: For the common_reference trait applied to a parameter pack [...] 1246 1247template <class...> 1248struct common_reference; 1249 1250template <class... _Types> 1251using common_reference_t = typename common_reference<_Types...>::type; 1252 1253// bullet 1 - sizeof...(T) == 0 1254template<> 1255struct common_reference<> {}; 1256 1257// bullet 2 - sizeof...(T) == 1 1258template <class _Tp> 1259struct common_reference<_Tp> 1260{ 1261 using type = _Tp; 1262}; 1263 1264// bullet 3 - sizeof...(T) == 2 1265template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 1266template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 1267template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 1268 1269// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 1270// the member typedef `type` denotes that type. 1271template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 1272 1273template <class _Tp, class _Up> 1274requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 1275struct __common_reference_sub_bullet1<_Tp, _Up> 1276{ 1277 using type = __common_ref_t<_Tp, _Up>; 1278}; 1279 1280// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 1281// is well-formed, then the member typedef `type` denotes that type. 1282template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 1283 1284template <class _Tp, class _Up> 1285using __basic_common_reference_t = typename basic_common_reference< 1286 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 1287 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 1288 1289template <class _Tp, class _Up> 1290requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 1291struct __common_reference_sub_bullet2<_Tp, _Up> 1292{ 1293 using type = __basic_common_reference_t<_Tp, _Up>; 1294}; 1295 1296// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 1297// then the member typedef `type` denotes that type. 1298template <class _Tp, class _Up> 1299requires requires { typename __cond_res<_Tp, _Up>; } 1300struct __common_reference_sub_bullet3<_Tp, _Up> 1301{ 1302 using type = __cond_res<_Tp, _Up>; 1303}; 1304 1305 1306// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 1307// then the member typedef `type` denotes that type. 1308// - Otherwise, there shall be no member `type`. 1309template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 1310 1311// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 1312// any, as `common_reference_t<C, Rest...>`. 1313template <class _Tp, class _Up, class _Vp, class... _Rest> 1314requires requires { typename common_reference_t<_Tp, _Up>; } 1315struct common_reference<_Tp, _Up, _Vp, _Rest...> 1316 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 1317{}; 1318 1319// bullet 5 - Otherwise, there shall be no member `type`. 1320template <class...> struct common_reference {}; 1321 1322#endif // _LIBCPP_STD_VER > 17 1323 1324#ifndef _LIBCPP_CXX03_LANG 1325// First of all, we can't implement this check in C++03 mode because the {} 1326// default initialization syntax isn't valid. 1327// Second, we implement the trait in a funny manner with two defaulted template 1328// arguments to workaround Clang's PR43454. 1329template <class _Tp> 1330void __test_implicit_default_constructible(_Tp); 1331 1332template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 1333struct __is_implicitly_default_constructible 1334 : false_type 1335{ }; 1336 1337template <class _Tp> 1338struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 1339 : true_type 1340{ }; 1341 1342template <class _Tp> 1343struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 1344 : false_type 1345{ }; 1346#endif // !C++03 1347 1348// result_of 1349 1350#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1351template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 1352 1353template <class _Fp, class ..._Args> 1354class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 1355 : public __invoke_of<_Fp, _Args...> 1356{ 1357}; 1358 1359#if _LIBCPP_STD_VER > 11 1360template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 1361#endif // _LIBCPP_STD_VER > 11 1362#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1363 1364// __swappable 1365 1366template <class _Tp> struct __is_swappable; 1367template <class _Tp> struct __is_nothrow_swappable; 1368 1369 1370#ifndef _LIBCPP_CXX03_LANG 1371template <class _Tp> 1372using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 1373#else 1374template <class> 1375using __swap_result_t = void; 1376#endif 1377 1378template <class _Tp> 1379inline _LIBCPP_INLINE_VISIBILITY 1380_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 1381swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 1382 is_nothrow_move_assignable<_Tp>::value); 1383 1384template<class _Tp, size_t _Np> 1385inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1386typename enable_if< 1387 __is_swappable<_Tp>::value 1388>::type 1389swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 1390 1391namespace __detail 1392{ 1393// ALL generic swap overloads MUST already have a declaration available at this point. 1394 1395template <class _Tp, class _Up = _Tp, 1396 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 1397struct __swappable_with 1398{ 1399 template <class _LHS, class _RHS> 1400 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 1401 __test_swap(int); 1402 template <class, class> 1403 static __nat __test_swap(long); 1404 1405 // Extra parens are needed for the C++03 definition of decltype. 1406 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 1407 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 1408 1409 static const bool value = _IsNotSame<__swap1, __nat>::value 1410 && _IsNotSame<__swap2, __nat>::value; 1411}; 1412 1413template <class _Tp, class _Up> 1414struct __swappable_with<_Tp, _Up, false> : false_type {}; 1415 1416template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 1417struct __nothrow_swappable_with { 1418 static const bool value = 1419#ifndef _LIBCPP_HAS_NO_NOEXCEPT 1420 noexcept(swap(declval<_Tp>(), declval<_Up>())) 1421 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 1422#else 1423 false; 1424#endif 1425}; 1426 1427template <class _Tp, class _Up> 1428struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 1429 1430} // namespace __detail 1431 1432template <class _Tp> 1433struct __is_swappable 1434 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 1435{ 1436}; 1437 1438template <class _Tp> 1439struct __is_nothrow_swappable 1440 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 1441{ 1442}; 1443 1444#if _LIBCPP_STD_VER > 14 1445 1446template <class _Tp, class _Up> 1447struct _LIBCPP_TEMPLATE_VIS is_swappable_with 1448 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 1449{ 1450}; 1451 1452template <class _Tp> 1453struct _LIBCPP_TEMPLATE_VIS is_swappable 1454 : public conditional< 1455 __is_referenceable<_Tp>::value, 1456 is_swappable_with< 1457 typename add_lvalue_reference<_Tp>::type, 1458 typename add_lvalue_reference<_Tp>::type>, 1459 false_type 1460 >::type 1461{ 1462}; 1463 1464template <class _Tp, class _Up> 1465struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 1466 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 1467{ 1468}; 1469 1470template <class _Tp> 1471struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 1472 : public conditional< 1473 __is_referenceable<_Tp>::value, 1474 is_nothrow_swappable_with< 1475 typename add_lvalue_reference<_Tp>::type, 1476 typename add_lvalue_reference<_Tp>::type>, 1477 false_type 1478 >::type 1479{ 1480}; 1481 1482template <class _Tp, class _Up> 1483inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 1484 1485template <class _Tp> 1486inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 1487 1488template <class _Tp, class _Up> 1489inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 1490 1491template <class _Tp> 1492inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 1493 1494#endif // _LIBCPP_STD_VER > 14 1495 1496template <class _Tp, bool = is_enum<_Tp>::value> 1497struct __sfinae_underlying_type 1498{ 1499 typedef typename underlying_type<_Tp>::type type; 1500 typedef decltype(((type)1) + 0) __promoted_type; 1501}; 1502 1503template <class _Tp> 1504struct __sfinae_underlying_type<_Tp, false> {}; 1505 1506inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1507int __convert_to_integral(int __val) { return __val; } 1508 1509inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1510unsigned __convert_to_integral(unsigned __val) { return __val; } 1511 1512inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1513long __convert_to_integral(long __val) { return __val; } 1514 1515inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1516unsigned long __convert_to_integral(unsigned long __val) { return __val; } 1517 1518inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1519long long __convert_to_integral(long long __val) { return __val; } 1520 1521inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1522unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 1523 1524template<typename _Fp> 1525inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1526typename enable_if<is_floating_point<_Fp>::value, long long>::type 1527 __convert_to_integral(_Fp __val) { return __val; } 1528 1529#ifndef _LIBCPP_HAS_NO_INT128 1530inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1531__int128_t __convert_to_integral(__int128_t __val) { return __val; } 1532 1533inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1534__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 1535#endif 1536 1537template <class _Tp> 1538inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1539typename __sfinae_underlying_type<_Tp>::__promoted_type 1540__convert_to_integral(_Tp __val) { return __val; } 1541 1542// These traits are used in __tree and __hash_table 1543struct __extract_key_fail_tag {}; 1544struct __extract_key_self_tag {}; 1545struct __extract_key_first_tag {}; 1546 1547template <class _ValTy, class _Key, 1548 class _RawValTy = typename __unconstref<_ValTy>::type> 1549struct __can_extract_key 1550 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 1551 __extract_key_fail_tag>::type {}; 1552 1553template <class _Pair, class _Key, class _First, class _Second> 1554struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 1555 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 1556 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 1557 1558// __can_extract_map_key uses true_type/false_type instead of the tags. 1559// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 1560// and _ValTy == _Key. 1561template <class _ValTy, class _Key, class _ContainerValueTy, 1562 class _RawValTy = typename __unconstref<_ValTy>::type> 1563struct __can_extract_map_key 1564 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 1565 1566// This specialization returns __extract_key_fail_tag for non-map containers 1567// because _Key == _ContainerValueTy 1568template <class _ValTy, class _Key, class _RawValTy> 1569struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 1570 : false_type {}; 1571 1572template <class _CharT> 1573using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 1574 1575template<class _Tp> 1576using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 1577 1578template<bool _Const, class _Tp> 1579using __maybe_const = typename conditional<_Const, const _Tp, _Tp>::type; 1580 1581_LIBCPP_END_NAMESPACE_STD 1582 1583#endif // _LIBCPP_TYPE_TRAITS 1584