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 <version> 521 522#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 523# pragma GCC system_header 524#endif 525 526_LIBCPP_BEGIN_NAMESPACE_STD 527 528template <class _T1, class _T2> struct _LIBCPP_TEMPLATE_VIS pair; 529template <class _Tp> struct _LIBCPP_TEMPLATE_VIS hash; 530 531template <bool> struct _MetaBase; 532template <> 533struct _MetaBase<true> { 534 template <class _Tp, class _Up> 535 using _SelectImpl _LIBCPP_NODEBUG = _Tp; 536 template <template <class...> class _FirstFn, template <class...> class, class ..._Args> 537 using _SelectApplyImpl _LIBCPP_NODEBUG = _FirstFn<_Args...>; 538 template <class _First, class...> 539 using _FirstImpl _LIBCPP_NODEBUG = _First; 540 template <class, class _Second, class...> 541 using _SecondImpl _LIBCPP_NODEBUG = _Second; 542 template <class _Result, class _First, class ..._Rest> 543 using _OrImpl _LIBCPP_NODEBUG = typename _MetaBase<_First::value != true && sizeof...(_Rest) != 0>::template _OrImpl<_First, _Rest...>; 544}; 545 546template <> 547struct _MetaBase<false> { 548 template <class _Tp, class _Up> 549 using _SelectImpl _LIBCPP_NODEBUG = _Up; 550 template <template <class...> class, template <class...> class _SecondFn, class ..._Args> 551 using _SelectApplyImpl _LIBCPP_NODEBUG = _SecondFn<_Args...>; 552 template <class _Result, class ...> 553 using _OrImpl _LIBCPP_NODEBUG = _Result; 554}; 555template <bool _Cond, class _IfRes, class _ElseRes> 556using _If _LIBCPP_NODEBUG = typename _MetaBase<_Cond>::template _SelectImpl<_IfRes, _ElseRes>; 557template <class ..._Rest> 558using _Or _LIBCPP_NODEBUG = typename _MetaBase< sizeof...(_Rest) != 0 >::template _OrImpl<false_type, _Rest...>; 559template <class ..._Args> 560using _FirstType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 1)>::template _FirstImpl<_Args...>; 561template <class ..._Args> 562using _SecondType _LIBCPP_NODEBUG = typename _MetaBase<(sizeof...(_Args) >= 2)>::template _SecondImpl<_Args...>; 563 564template <class ...> using __expand_to_true = true_type; 565template <class ..._Pred> 566__expand_to_true<__enable_if_t<_Pred::value>...> __and_helper(int); 567template <class ...> 568false_type __and_helper(...); 569template <class ..._Pred> 570using _And _LIBCPP_NODEBUG = decltype(__and_helper<_Pred...>(0)); 571 572template <template <class...> class _Func, class ..._Args> 573struct _Lazy : _Func<_Args...> {}; 574 575// Member detector base 576 577template <template <class...> class _Templ, class ..._Args, class = _Templ<_Args...> > 578true_type __sfinae_test_impl(int); 579template <template <class...> class, class ...> 580false_type __sfinae_test_impl(...); 581 582template <template <class ...> class _Templ, class ..._Args> 583using _IsValidExpansion _LIBCPP_NODEBUG = decltype(__sfinae_test_impl<_Templ, _Args...>(0)); 584 585template <class _Tp, bool> 586struct _LIBCPP_TEMPLATE_VIS __dependent_type : public _Tp {}; 587 588// is_same 589 590template <class _Tp> 591using __test_for_primary_template = __enable_if_t< 592 _IsSame<_Tp, typename _Tp::__primary_template>::value 593 >; 594template <class _Tp> 595using __is_primary_template = _IsValidExpansion< 596 __test_for_primary_template, _Tp 597 >; 598 599// is_integral 600 601// [basic.fundamental] defines five standard signed integer types; 602// __int128_t is an extended signed integer type. 603// The signed and unsigned integer types, plus bool and the 604// five types with "char" in their name, compose the "integral" types. 605 606template <class _Tp> struct __libcpp_is_signed_integer : public false_type {}; 607template <> struct __libcpp_is_signed_integer<signed char> : public true_type {}; 608template <> struct __libcpp_is_signed_integer<signed short> : public true_type {}; 609template <> struct __libcpp_is_signed_integer<signed int> : public true_type {}; 610template <> struct __libcpp_is_signed_integer<signed long> : public true_type {}; 611template <> struct __libcpp_is_signed_integer<signed long long> : public true_type {}; 612#ifndef _LIBCPP_HAS_NO_INT128 613template <> struct __libcpp_is_signed_integer<__int128_t> : public true_type {}; 614#endif 615 616template <class _Tp> struct __libcpp_is_unsigned_integer : public false_type {}; 617template <> struct __libcpp_is_unsigned_integer<unsigned char> : public true_type {}; 618template <> struct __libcpp_is_unsigned_integer<unsigned short> : public true_type {}; 619template <> struct __libcpp_is_unsigned_integer<unsigned int> : public true_type {}; 620template <> struct __libcpp_is_unsigned_integer<unsigned long> : public true_type {}; 621template <> struct __libcpp_is_unsigned_integer<unsigned long long> : public true_type {}; 622#ifndef _LIBCPP_HAS_NO_INT128 623template <> struct __libcpp_is_unsigned_integer<__uint128_t> : public true_type {}; 624#endif 625 626template <class _Tp> 627struct __unconstref { 628 typedef _LIBCPP_NODEBUG typename remove_const<typename remove_reference<_Tp>::type>::type type; 629}; 630 631template <class _Tp> 632using __uncvref_t _LIBCPP_NODEBUG = typename remove_cv<typename remove_reference<_Tp>::type>::type; 633 634// __is_same_uncvref 635 636template <class _Tp, class _Up> 637struct __is_same_uncvref : _IsSame<__uncvref_t<_Tp>, __uncvref_t<_Up> > {}; 638 639#if _LIBCPP_STD_VER > 17 640// remove_cvref - same as __uncvref 641template <class _Tp> 642struct remove_cvref { 643 using type _LIBCPP_NODEBUG = __uncvref_t<_Tp>; 644}; 645 646template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type; 647#endif 648 649// is_nothrow_convertible 650 651#if _LIBCPP_STD_VER > 17 652 653template <typename _Tp> 654static void __test_noexcept(_Tp) noexcept; 655 656template<typename _Fm, typename _To> 657static bool_constant<noexcept(_VSTD::__test_noexcept<_To>(declval<_Fm>()))> 658__is_nothrow_convertible_test(); 659 660template <typename _Fm, typename _To> 661struct __is_nothrow_convertible_helper: decltype(__is_nothrow_convertible_test<_Fm, _To>()) 662{ }; 663 664template <typename _Fm, typename _To> 665struct is_nothrow_convertible : _Or< 666 _And<is_void<_To>, is_void<_Fm>>, 667 _Lazy<_And, is_convertible<_Fm, _To>, __is_nothrow_convertible_helper<_Fm, _To>> 668>::type { }; 669 670template <typename _Fm, typename _To> 671inline constexpr bool is_nothrow_convertible_v = is_nothrow_convertible<_Fm, _To>::value; 672 673#endif // _LIBCPP_STD_VER > 17 674 675// aligned_storage 676 677template <class _Hp, class _Tp> 678struct __type_list 679{ 680 typedef _Hp _Head; 681 typedef _Tp _Tail; 682}; 683 684template <class _Tp> 685struct __align_type 686{ 687 static const size_t value = _LIBCPP_PREFERRED_ALIGNOF(_Tp); 688 typedef _Tp type; 689}; 690 691struct __struct_double {long double __lx;}; 692struct __struct_double4 {double __lx[4];}; 693 694typedef 695 __type_list<__align_type<unsigned char>, 696 __type_list<__align_type<unsigned short>, 697 __type_list<__align_type<unsigned int>, 698 __type_list<__align_type<unsigned long>, 699 __type_list<__align_type<unsigned long long>, 700 __type_list<__align_type<double>, 701 __type_list<__align_type<long double>, 702 __type_list<__align_type<__struct_double>, 703 __type_list<__align_type<__struct_double4>, 704 __type_list<__align_type<int*>, 705 __nat 706 > > > > > > > > > > __all_types; 707 708template <size_t _Align> 709struct _ALIGNAS(_Align) __fallback_overaligned {}; 710 711template <class _TL, size_t _Align> struct __find_pod; 712 713template <class _Hp, size_t _Align> 714struct __find_pod<__type_list<_Hp, __nat>, _Align> 715{ 716 typedef typename conditional< 717 _Align == _Hp::value, 718 typename _Hp::type, 719 __fallback_overaligned<_Align> 720 >::type type; 721}; 722 723template <class _Hp, class _Tp, size_t _Align> 724struct __find_pod<__type_list<_Hp, _Tp>, _Align> 725{ 726 typedef typename conditional< 727 _Align == _Hp::value, 728 typename _Hp::type, 729 typename __find_pod<_Tp, _Align>::type 730 >::type type; 731}; 732 733template <class _TL, size_t _Len> struct __find_max_align; 734 735template <class _Hp, size_t _Len> 736struct __find_max_align<__type_list<_Hp, __nat>, _Len> : public integral_constant<size_t, _Hp::value> {}; 737 738template <size_t _Len, size_t _A1, size_t _A2> 739struct __select_align 740{ 741private: 742 static const size_t __min = _A2 < _A1 ? _A2 : _A1; 743 static const size_t __max = _A1 < _A2 ? _A2 : _A1; 744public: 745 static const size_t value = _Len < __max ? __min : __max; 746}; 747 748template <class _Hp, class _Tp, size_t _Len> 749struct __find_max_align<__type_list<_Hp, _Tp>, _Len> 750 : public integral_constant<size_t, __select_align<_Len, _Hp::value, __find_max_align<_Tp, _Len>::value>::value> {}; 751 752template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 753struct _LIBCPP_TEMPLATE_VIS aligned_storage 754{ 755 typedef typename __find_pod<__all_types, _Align>::type _Aligner; 756 union type 757 { 758 _Aligner __align; 759 unsigned char __data[(_Len + _Align - 1)/_Align * _Align]; 760 }; 761}; 762 763#if _LIBCPP_STD_VER > 11 764template <size_t _Len, size_t _Align = __find_max_align<__all_types, _Len>::value> 765 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type; 766#endif 767 768#define _CREATE_ALIGNED_STORAGE_SPECIALIZATION(n) \ 769template <size_t _Len>\ 770struct _LIBCPP_TEMPLATE_VIS aligned_storage<_Len, n>\ 771{\ 772 struct _ALIGNAS(n) type\ 773 {\ 774 unsigned char __lx[(_Len + n - 1)/n * n];\ 775 };\ 776} 777 778_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1); 779_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2); 780_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4); 781_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x8); 782_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x10); 783_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x20); 784_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x40); 785_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x80); 786_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x100); 787_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x200); 788_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x400); 789_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x800); 790_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x1000); 791_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x2000); 792// PE/COFF does not support alignment beyond 8192 (=0x2000) 793#if !defined(_LIBCPP_OBJECT_FORMAT_COFF) 794_CREATE_ALIGNED_STORAGE_SPECIALIZATION(0x4000); 795#endif // !defined(_LIBCPP_OBJECT_FORMAT_COFF) 796 797#undef _CREATE_ALIGNED_STORAGE_SPECIALIZATION 798 799 800// aligned_union 801 802template <size_t _I0, size_t ..._In> 803struct __static_max; 804 805template <size_t _I0> 806struct __static_max<_I0> 807{ 808 static const size_t value = _I0; 809}; 810 811template <size_t _I0, size_t _I1, size_t ..._In> 812struct __static_max<_I0, _I1, _In...> 813{ 814 static const size_t value = _I0 >= _I1 ? __static_max<_I0, _In...>::value : 815 __static_max<_I1, _In...>::value; 816}; 817 818template <size_t _Len, class _Type0, class ..._Types> 819struct aligned_union 820{ 821 static const size_t alignment_value = __static_max<_LIBCPP_PREFERRED_ALIGNOF(_Type0), 822 _LIBCPP_PREFERRED_ALIGNOF(_Types)...>::value; 823 static const size_t __len = __static_max<_Len, sizeof(_Type0), 824 sizeof(_Types)...>::value; 825 typedef typename aligned_storage<__len, alignment_value>::type type; 826}; 827 828#if _LIBCPP_STD_VER > 11 829template <size_t _Len, class ..._Types> using aligned_union_t = typename aligned_union<_Len, _Types...>::type; 830#endif 831 832template <class _Tp> 833struct __numeric_type 834{ 835 static void __test(...); 836 static float __test(float); 837 static double __test(char); 838 static double __test(int); 839 static double __test(unsigned); 840 static double __test(long); 841 static double __test(unsigned long); 842 static double __test(long long); 843 static double __test(unsigned long long); 844 static double __test(double); 845 static long double __test(long double); 846 847 typedef decltype(__test(declval<_Tp>())) type; 848 static const bool value = _IsNotSame<type, void>::value; 849}; 850 851template <> 852struct __numeric_type<void> 853{ 854 static const bool value = true; 855}; 856 857// __promote 858 859template <class _A1, class _A2 = void, class _A3 = void, 860 bool = __numeric_type<_A1>::value && 861 __numeric_type<_A2>::value && 862 __numeric_type<_A3>::value> 863class __promote_imp 864{ 865public: 866 static const bool value = false; 867}; 868 869template <class _A1, class _A2, class _A3> 870class __promote_imp<_A1, _A2, _A3, true> 871{ 872private: 873 typedef typename __promote_imp<_A1>::type __type1; 874 typedef typename __promote_imp<_A2>::type __type2; 875 typedef typename __promote_imp<_A3>::type __type3; 876public: 877 typedef decltype(__type1() + __type2() + __type3()) type; 878 static const bool value = true; 879}; 880 881template <class _A1, class _A2> 882class __promote_imp<_A1, _A2, void, true> 883{ 884private: 885 typedef typename __promote_imp<_A1>::type __type1; 886 typedef typename __promote_imp<_A2>::type __type2; 887public: 888 typedef decltype(__type1() + __type2()) type; 889 static const bool value = true; 890}; 891 892template <class _A1> 893class __promote_imp<_A1, void, void, true> 894{ 895public: 896 typedef typename __numeric_type<_A1>::type type; 897 static const bool value = true; 898}; 899 900template <class _A1, class _A2 = void, class _A3 = void> 901class __promote : public __promote_imp<_A1, _A2, _A3> {}; 902 903// make_signed / make_unsigned 904 905typedef 906 __type_list<signed char, 907 __type_list<signed short, 908 __type_list<signed int, 909 __type_list<signed long, 910 __type_list<signed long long, 911#ifndef _LIBCPP_HAS_NO_INT128 912 __type_list<__int128_t, 913#endif 914 __nat 915#ifndef _LIBCPP_HAS_NO_INT128 916 > 917#endif 918 > > > > > __signed_types; 919 920typedef 921 __type_list<unsigned char, 922 __type_list<unsigned short, 923 __type_list<unsigned int, 924 __type_list<unsigned long, 925 __type_list<unsigned long long, 926#ifndef _LIBCPP_HAS_NO_INT128 927 __type_list<__uint128_t, 928#endif 929 __nat 930#ifndef _LIBCPP_HAS_NO_INT128 931 > 932#endif 933 > > > > > __unsigned_types; 934 935template <class _TypeList, size_t _Size, bool = _Size <= sizeof(typename _TypeList::_Head)> struct __find_first; 936 937template <class _Hp, class _Tp, size_t _Size> 938struct __find_first<__type_list<_Hp, _Tp>, _Size, true> 939{ 940 typedef _LIBCPP_NODEBUG _Hp type; 941}; 942 943template <class _Hp, class _Tp, size_t _Size> 944struct __find_first<__type_list<_Hp, _Tp>, _Size, false> 945{ 946 typedef _LIBCPP_NODEBUG typename __find_first<_Tp, _Size>::type type; 947}; 948 949template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 950struct __make_signed {}; 951 952template <class _Tp> 953struct __make_signed<_Tp, true> 954{ 955 typedef typename __find_first<__signed_types, sizeof(_Tp)>::type type; 956}; 957 958template <> struct __make_signed<bool, true> {}; 959template <> struct __make_signed< signed short, true> {typedef short type;}; 960template <> struct __make_signed<unsigned short, true> {typedef short type;}; 961template <> struct __make_signed< signed int, true> {typedef int type;}; 962template <> struct __make_signed<unsigned int, true> {typedef int type;}; 963template <> struct __make_signed< signed long, true> {typedef long type;}; 964template <> struct __make_signed<unsigned long, true> {typedef long type;}; 965template <> struct __make_signed< signed long long, true> {typedef long long type;}; 966template <> struct __make_signed<unsigned long long, true> {typedef long long type;}; 967#ifndef _LIBCPP_HAS_NO_INT128 968template <> struct __make_signed<__int128_t, true> {typedef __int128_t type;}; 969template <> struct __make_signed<__uint128_t, true> {typedef __int128_t type;}; 970#endif 971 972template <class _Tp> 973struct _LIBCPP_TEMPLATE_VIS make_signed 974{ 975 typedef typename __apply_cv<_Tp, typename __make_signed<typename remove_cv<_Tp>::type>::type>::type type; 976}; 977 978#if _LIBCPP_STD_VER > 11 979template <class _Tp> using make_signed_t = typename make_signed<_Tp>::type; 980#endif 981 982template <class _Tp, bool = is_integral<_Tp>::value || is_enum<_Tp>::value> 983struct __make_unsigned {}; 984 985template <class _Tp> 986struct __make_unsigned<_Tp, true> 987{ 988 typedef typename __find_first<__unsigned_types, sizeof(_Tp)>::type type; 989}; 990 991template <> struct __make_unsigned<bool, true> {}; 992template <> struct __make_unsigned< signed short, true> {typedef unsigned short type;}; 993template <> struct __make_unsigned<unsigned short, true> {typedef unsigned short type;}; 994template <> struct __make_unsigned< signed int, true> {typedef unsigned int type;}; 995template <> struct __make_unsigned<unsigned int, true> {typedef unsigned int type;}; 996template <> struct __make_unsigned< signed long, true> {typedef unsigned long type;}; 997template <> struct __make_unsigned<unsigned long, true> {typedef unsigned long type;}; 998template <> struct __make_unsigned< signed long long, true> {typedef unsigned long long type;}; 999template <> struct __make_unsigned<unsigned long long, true> {typedef unsigned long long type;}; 1000#ifndef _LIBCPP_HAS_NO_INT128 1001template <> struct __make_unsigned<__int128_t, true> {typedef __uint128_t type;}; 1002template <> struct __make_unsigned<__uint128_t, true> {typedef __uint128_t type;}; 1003#endif 1004 1005template <class _Tp> 1006struct _LIBCPP_TEMPLATE_VIS make_unsigned 1007{ 1008 typedef typename __apply_cv<_Tp, typename __make_unsigned<typename remove_cv<_Tp>::type>::type>::type type; 1009}; 1010 1011#if _LIBCPP_STD_VER > 11 1012template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type; 1013#endif 1014 1015#ifndef _LIBCPP_CXX03_LANG 1016template <class _Tp> 1017_LIBCPP_HIDE_FROM_ABI constexpr 1018typename make_unsigned<_Tp>::type __to_unsigned_like(_Tp __x) noexcept { 1019 return static_cast<typename make_unsigned<_Tp>::type>(__x); 1020} 1021#endif 1022 1023#if _LIBCPP_STD_VER > 17 1024// Let COND_RES(X, Y) be: 1025template <class _Tp, class _Up> 1026using __cond_type = decltype(false ? declval<_Tp>() : declval<_Up>()); 1027 1028template <class _Tp, class _Up, class = void> 1029struct __common_type3 {}; 1030 1031// sub-bullet 4 - "if COND_RES(CREF(D1), CREF(D2)) denotes a type..." 1032template <class _Tp, class _Up> 1033struct __common_type3<_Tp, _Up, void_t<__cond_type<const _Tp&, const _Up&>>> 1034{ 1035 using type = remove_cvref_t<__cond_type<const _Tp&, const _Up&>>; 1036}; 1037 1038template <class _Tp, class _Up, class = void> 1039struct __common_type2_imp : __common_type3<_Tp, _Up> {}; 1040#else 1041template <class _Tp, class _Up, class = void> 1042struct __common_type2_imp {}; 1043#endif 1044 1045// sub-bullet 3 - "if decay_t<decltype(false ? declval<D1>() : declval<D2>())> ..." 1046template <class _Tp, class _Up> 1047struct __common_type2_imp<_Tp, _Up, 1048 typename __void_t<decltype( 1049 true ? declval<_Tp>() : declval<_Up>() 1050 )>::type> 1051{ 1052 typedef _LIBCPP_NODEBUG typename decay<decltype( 1053 true ? declval<_Tp>() : declval<_Up>() 1054 )>::type type; 1055}; 1056 1057template <class, class = void> 1058struct __common_type_impl {}; 1059 1060// Clang provides variadic templates in C++03 as an extension. 1061#if !defined(_LIBCPP_CXX03_LANG) || defined(__clang__) 1062# define _LIBCPP_OPTIONAL_PACK(...) , __VA_ARGS__ 1063template <class... _Tp> 1064struct __common_types; 1065template <class... _Tp> 1066struct _LIBCPP_TEMPLATE_VIS common_type; 1067#else 1068# define _LIBCPP_OPTIONAL_PACK(...) 1069struct __no_arg; 1070template <class _Tp, class _Up, class = __no_arg> 1071struct __common_types; 1072template <class _Tp = __no_arg, class _Up = __no_arg, class _Vp = __no_arg, 1073 class _Unused = __no_arg> 1074struct common_type { 1075 static_assert(sizeof(_Unused) == 0, 1076 "common_type accepts at most 3 arguments in C++03"); 1077}; 1078#endif // _LIBCPP_CXX03_LANG 1079 1080template <class _Tp, class _Up> 1081struct __common_type_impl< 1082 __common_types<_Tp, _Up>, 1083 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1084{ 1085 typedef typename common_type<_Tp, _Up>::type type; 1086}; 1087 1088template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1089struct __common_type_impl< 1090 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)>, 1091 typename __void_t<typename common_type<_Tp, _Up>::type>::type> 1092 : __common_type_impl<__common_types<typename common_type<_Tp, _Up>::type, 1093 _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > { 1094}; 1095 1096// bullet 1 - sizeof...(Tp) == 0 1097 1098template <> 1099struct _LIBCPP_TEMPLATE_VIS common_type<> {}; 1100 1101// bullet 2 - sizeof...(Tp) == 1 1102 1103template <class _Tp> 1104struct _LIBCPP_TEMPLATE_VIS common_type<_Tp> 1105 : public common_type<_Tp, _Tp> {}; 1106 1107// bullet 3 - sizeof...(Tp) == 2 1108 1109// sub-bullet 1 - "If is_same_v<T1, D1> is false or ..." 1110template <class _Tp, class _Up> 1111struct _LIBCPP_TEMPLATE_VIS common_type<_Tp, _Up> 1112 : conditional< 1113 _IsSame<_Tp, typename decay<_Tp>::type>::value && _IsSame<_Up, typename decay<_Up>::type>::value, 1114 __common_type2_imp<_Tp, _Up>, 1115 common_type<typename decay<_Tp>::type, typename decay<_Up>::type> 1116 >::type 1117{}; 1118 1119// bullet 4 - sizeof...(Tp) > 2 1120 1121template <class _Tp, class _Up, class _Vp _LIBCPP_OPTIONAL_PACK(class... _Rest)> 1122struct _LIBCPP_TEMPLATE_VIS 1123 common_type<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> 1124 : __common_type_impl< 1125 __common_types<_Tp, _Up, _Vp _LIBCPP_OPTIONAL_PACK(_Rest...)> > {}; 1126 1127#undef _LIBCPP_OPTIONAL_PACK 1128 1129#if _LIBCPP_STD_VER > 11 1130template <class ..._Tp> using common_type_t = typename common_type<_Tp...>::type; 1131#endif 1132 1133#if _LIBCPP_STD_VER > 11 1134// Let COPYCV(FROM, TO) be an alias for type TO with the addition of FROM's 1135// top-level cv-qualifiers. 1136template <class _From, class _To> 1137struct __copy_cv 1138{ 1139 using type = _To; 1140}; 1141 1142template <class _From, class _To> 1143struct __copy_cv<const _From, _To> 1144{ 1145 using type = add_const_t<_To>; 1146}; 1147 1148template <class _From, class _To> 1149struct __copy_cv<volatile _From, _To> 1150{ 1151 using type = add_volatile_t<_To>; 1152}; 1153 1154template <class _From, class _To> 1155struct __copy_cv<const volatile _From, _To> 1156{ 1157 using type = add_cv_t<_To>; 1158}; 1159 1160template <class _From, class _To> 1161using __copy_cv_t = typename __copy_cv<_From, _To>::type; 1162 1163template <class _From, class _To> 1164struct __copy_cvref 1165{ 1166 using type = __copy_cv_t<_From, _To>; 1167}; 1168 1169template <class _From, class _To> 1170struct __copy_cvref<_From&, _To> 1171{ 1172 using type = add_lvalue_reference_t<__copy_cv_t<_From, _To>>; 1173}; 1174 1175template <class _From, class _To> 1176struct __copy_cvref<_From&&, _To> 1177{ 1178 using type = add_rvalue_reference_t<__copy_cv_t<_From, _To>>; 1179}; 1180 1181template <class _From, class _To> 1182using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 1183 1184#endif // _LIBCPP_STD_VER > 11 1185 1186// common_reference 1187#if _LIBCPP_STD_VER > 17 1188// Let COND_RES(X, Y) be: 1189template <class _Xp, class _Yp> 1190using __cond_res = 1191 decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()()); 1192 1193// Let `XREF(A)` denote a unary alias template `T` such that `T<U>` denotes the same type as `U` 1194// with the addition of `A`'s cv and reference qualifiers, for a non-reference cv-unqualified type 1195// `U`. 1196// [Note: `XREF(A)` is `__xref<A>::template __apply`] 1197template <class _Tp> 1198struct __xref { 1199 template<class _Up> 1200 using __apply = __copy_cvref_t<_Tp, _Up>; 1201}; 1202 1203// Given types A and B, let X be remove_reference_t<A>, let Y be remove_reference_t<B>, 1204// and let COMMON-REF(A, B) be: 1205template<class _Ap, class _Bp, class _Xp = remove_reference_t<_Ap>, class _Yp = remove_reference_t<_Bp>> 1206struct __common_ref; 1207 1208template<class _Xp, class _Yp> 1209using __common_ref_t = typename __common_ref<_Xp, _Yp>::__type; 1210 1211template<class _Xp, class _Yp> 1212using __cv_cond_res = __cond_res<__copy_cv_t<_Xp, _Yp>&, __copy_cv_t<_Yp, _Xp>&>; 1213 1214 1215// If A and B are both lvalue reference types, COMMON-REF(A, B) is 1216// COND-RES(COPYCV(X, Y)&, COPYCV(Y, X)&) if that type exists and is a reference type. 1217template<class _Ap, class _Bp, class _Xp, class _Yp> 1218requires requires { typename __cv_cond_res<_Xp, _Yp>; } && is_reference_v<__cv_cond_res<_Xp, _Yp>> 1219struct __common_ref<_Ap&, _Bp&, _Xp, _Yp> 1220{ 1221 using __type = __cv_cond_res<_Xp, _Yp>; 1222}; 1223 1224// Otherwise, let C be remove_reference_t<COMMON-REF(X&, Y&)>&&. ... 1225template <class _Xp, class _Yp> 1226using __common_ref_C = remove_reference_t<__common_ref_t<_Xp&, _Yp&>>&&; 1227 1228 1229// .... If A and B are both rvalue reference types, C is well-formed, and 1230// is_convertible_v<A, C> && is_convertible_v<B, C> is true, then COMMON-REF(A, B) is C. 1231template<class _Ap, class _Bp, class _Xp, class _Yp> 1232requires 1233 requires { typename __common_ref_C<_Xp, _Yp>; } && 1234 is_convertible_v<_Ap&&, __common_ref_C<_Xp, _Yp>> && 1235 is_convertible_v<_Bp&&, __common_ref_C<_Xp, _Yp>> 1236struct __common_ref<_Ap&&, _Bp&&, _Xp, _Yp> 1237{ 1238 using __type = __common_ref_C<_Xp, _Yp>; 1239}; 1240 1241// Otherwise, let D be COMMON-REF(const X&, Y&). ... 1242template <class _Tp, class _Up> 1243using __common_ref_D = __common_ref_t<const _Tp&, _Up&>; 1244 1245// ... If A is an rvalue reference and B is an lvalue reference and D is well-formed and 1246// is_convertible_v<A, D> is true, then COMMON-REF(A, B) is D. 1247template<class _Ap, class _Bp, class _Xp, class _Yp> 1248requires requires { typename __common_ref_D<_Xp, _Yp>; } && 1249 is_convertible_v<_Ap&&, __common_ref_D<_Xp, _Yp>> 1250struct __common_ref<_Ap&&, _Bp&, _Xp, _Yp> 1251{ 1252 using __type = __common_ref_D<_Xp, _Yp>; 1253}; 1254 1255// Otherwise, if A is an lvalue reference and B is an rvalue reference, then 1256// COMMON-REF(A, B) is COMMON-REF(B, A). 1257template<class _Ap, class _Bp, class _Xp, class _Yp> 1258struct __common_ref<_Ap&, _Bp&&, _Xp, _Yp> : __common_ref<_Bp&&, _Ap&> {}; 1259 1260// Otherwise, COMMON-REF(A, B) is ill-formed. 1261template<class _Ap, class _Bp, class _Xp, class _Yp> 1262struct __common_ref {}; 1263 1264// Note C: For the common_reference trait applied to a parameter pack [...] 1265 1266template <class...> 1267struct common_reference; 1268 1269template <class... _Types> 1270using common_reference_t = typename common_reference<_Types...>::type; 1271 1272// bullet 1 - sizeof...(T) == 0 1273template<> 1274struct common_reference<> {}; 1275 1276// bullet 2 - sizeof...(T) == 1 1277template <class _Tp> 1278struct common_reference<_Tp> 1279{ 1280 using type = _Tp; 1281}; 1282 1283// bullet 3 - sizeof...(T) == 2 1284template <class _Tp, class _Up> struct __common_reference_sub_bullet3; 1285template <class _Tp, class _Up> struct __common_reference_sub_bullet2 : __common_reference_sub_bullet3<_Tp, _Up> {}; 1286template <class _Tp, class _Up> struct __common_reference_sub_bullet1 : __common_reference_sub_bullet2<_Tp, _Up> {}; 1287 1288// sub-bullet 1 - If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, then 1289// the member typedef `type` denotes that type. 1290template <class _Tp, class _Up> struct common_reference<_Tp, _Up> : __common_reference_sub_bullet1<_Tp, _Up> {}; 1291 1292template <class _Tp, class _Up> 1293requires is_reference_v<_Tp> && is_reference_v<_Up> && requires { typename __common_ref_t<_Tp, _Up>; } 1294struct __common_reference_sub_bullet1<_Tp, _Up> 1295{ 1296 using type = __common_ref_t<_Tp, _Up>; 1297}; 1298 1299// sub-bullet 2 - Otherwise, if basic_common_reference<remove_cvref_t<T1>, remove_cvref_t<T2>, XREF(T1), XREF(T2)>::type 1300// is well-formed, then the member typedef `type` denotes that type. 1301template <class, class, template <class> class, template <class> class> struct basic_common_reference {}; 1302 1303template <class _Tp, class _Up> 1304using __basic_common_reference_t = typename basic_common_reference< 1305 remove_cvref_t<_Tp>, remove_cvref_t<_Up>, 1306 __xref<_Tp>::template __apply, __xref<_Up>::template __apply>::type; 1307 1308template <class _Tp, class _Up> 1309requires requires { typename __basic_common_reference_t<_Tp, _Up>; } 1310struct __common_reference_sub_bullet2<_Tp, _Up> 1311{ 1312 using type = __basic_common_reference_t<_Tp, _Up>; 1313}; 1314 1315// sub-bullet 3 - Otherwise, if COND-RES(T1, T2) is well-formed, 1316// then the member typedef `type` denotes that type. 1317template <class _Tp, class _Up> 1318requires requires { typename __cond_res<_Tp, _Up>; } 1319struct __common_reference_sub_bullet3<_Tp, _Up> 1320{ 1321 using type = __cond_res<_Tp, _Up>; 1322}; 1323 1324 1325// sub-bullet 4 & 5 - Otherwise, if common_type_t<T1, T2> is well-formed, 1326// then the member typedef `type` denotes that type. 1327// - Otherwise, there shall be no member `type`. 1328template <class _Tp, class _Up> struct __common_reference_sub_bullet3 : common_type<_Tp, _Up> {}; 1329 1330// bullet 4 - If there is such a type `C`, the member typedef type shall denote the same type, if 1331// any, as `common_reference_t<C, Rest...>`. 1332template <class _Tp, class _Up, class _Vp, class... _Rest> 1333requires requires { typename common_reference_t<_Tp, _Up>; } 1334struct common_reference<_Tp, _Up, _Vp, _Rest...> 1335 : common_reference<common_reference_t<_Tp, _Up>, _Vp, _Rest...> 1336{}; 1337 1338// bullet 5 - Otherwise, there shall be no member `type`. 1339template <class...> struct common_reference {}; 1340 1341#endif // _LIBCPP_STD_VER > 17 1342 1343#ifndef _LIBCPP_CXX03_LANG 1344// First of all, we can't implement this check in C++03 mode because the {} 1345// default initialization syntax isn't valid. 1346// Second, we implement the trait in a funny manner with two defaulted template 1347// arguments to workaround Clang's PR43454. 1348template <class _Tp> 1349void __test_implicit_default_constructible(_Tp); 1350 1351template <class _Tp, class = void, class = typename is_default_constructible<_Tp>::type> 1352struct __is_implicitly_default_constructible 1353 : false_type 1354{ }; 1355 1356template <class _Tp> 1357struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), true_type> 1358 : true_type 1359{ }; 1360 1361template <class _Tp> 1362struct __is_implicitly_default_constructible<_Tp, decltype(__test_implicit_default_constructible<_Tp const&>({})), false_type> 1363 : false_type 1364{ }; 1365#endif // !C++03 1366 1367// result_of 1368 1369#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1370template <class _Callable> class _LIBCPP_DEPRECATED_IN_CXX17 result_of; 1371 1372#ifndef _LIBCPP_CXX03_LANG 1373 1374template <class _Fp, class ..._Args> 1375class _LIBCPP_TEMPLATE_VIS result_of<_Fp(_Args...)> 1376 : public __invoke_of<_Fp, _Args...> 1377{ 1378}; 1379 1380#else // C++03 1381 1382template <class _Fn, bool, bool> 1383class __result_of 1384{ 1385}; 1386 1387template <class _Fn, class ..._Args> 1388class __result_of<_Fn(_Args...), true, false> 1389{ 1390public: 1391 typedef decltype(declval<_Fn>()(declval<_Args>()...)) type; 1392}; 1393 1394template <class _MP, class _Tp, bool _IsMemberFunctionPtr> 1395struct __result_of_mp; 1396 1397// member function pointer 1398 1399template <class _MP, class _Tp> 1400struct __result_of_mp<_MP, _Tp, true> 1401{ 1402 using type = typename __member_pointer_traits<_MP>::_ReturnType; 1403}; 1404 1405// member data pointer 1406 1407template <class _MP, class _Tp, bool> 1408struct __result_of_mdp; 1409 1410template <class _Rp, class _Class, class _Tp> 1411struct __result_of_mdp<_Rp _Class::*, _Tp, false> 1412{ 1413 using type = typename __apply_cv<decltype(*declval<_Tp>()), _Rp>::type&; 1414}; 1415 1416template <class _Rp, class _Class, class _Tp> 1417struct __result_of_mdp<_Rp _Class::*, _Tp, true> 1418{ 1419 using type = typename __apply_cv<_Tp, _Rp>::type&; 1420}; 1421 1422template <class _Rp, class _Class, class _Tp> 1423struct __result_of_mp<_Rp _Class::*, _Tp, false> 1424 : public __result_of_mdp<_Rp _Class::*, _Tp, 1425 is_base_of<_Class, typename remove_reference<_Tp>::type>::value> 1426{ 1427}; 1428 1429template <class _Fn, class _Tp> 1430class __result_of<_Fn(_Tp), false, true> // _Fn must be member pointer 1431 : public __result_of_mp<typename remove_reference<_Fn>::type, 1432 _Tp, 1433 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1434{ 1435}; 1436 1437template <class _Fn, class _Tp, class ..._Args> 1438class __result_of<_Fn(_Tp, _Args...), false, true> // _Fn must be member pointer 1439 : public __result_of_mp<typename remove_reference<_Fn>::type, 1440 _Tp, 1441 is_member_function_pointer<typename remove_reference<_Fn>::type>::value> 1442{ 1443}; 1444 1445template <class _Fn, class ..._Args> 1446class _LIBCPP_TEMPLATE_VIS result_of<_Fn(_Args...)> 1447 : public __result_of<_Fn(_Args...), 1448 is_class<typename remove_reference<_Fn>::type>::value || 1449 is_function<typename remove_pointer<typename remove_reference<_Fn>::type>::type>::value, 1450 is_member_pointer<typename remove_reference<_Fn>::type>::value 1451 > 1452{ 1453}; 1454 1455#endif // C++03 1456 1457#if _LIBCPP_STD_VER > 11 1458template <class _Tp> using result_of_t _LIBCPP_DEPRECATED_IN_CXX17 = typename result_of<_Tp>::type; 1459#endif // _LIBCPP_STD_VER > 11 1460#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS) 1461 1462// __swappable 1463 1464template <class _Tp> struct __is_swappable; 1465template <class _Tp> struct __is_nothrow_swappable; 1466 1467 1468#ifndef _LIBCPP_CXX03_LANG 1469template <class _Tp> 1470using __swap_result_t = typename enable_if<is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value>::type; 1471#else 1472template <class> 1473using __swap_result_t = void; 1474#endif 1475 1476template <class _Tp> 1477inline _LIBCPP_INLINE_VISIBILITY 1478_LIBCPP_CONSTEXPR_AFTER_CXX17 __swap_result_t<_Tp> 1479swap(_Tp& __x, _Tp& __y) _NOEXCEPT_(is_nothrow_move_constructible<_Tp>::value && 1480 is_nothrow_move_assignable<_Tp>::value); 1481 1482template<class _Tp, size_t _Np> 1483inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 1484typename enable_if< 1485 __is_swappable<_Tp>::value 1486>::type 1487swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value); 1488 1489namespace __detail 1490{ 1491// ALL generic swap overloads MUST already have a declaration available at this point. 1492 1493template <class _Tp, class _Up = _Tp, 1494 bool _NotVoid = !is_void<_Tp>::value && !is_void<_Up>::value> 1495struct __swappable_with 1496{ 1497 template <class _LHS, class _RHS> 1498 static decltype(swap(declval<_LHS>(), declval<_RHS>())) 1499 __test_swap(int); 1500 template <class, class> 1501 static __nat __test_swap(long); 1502 1503 // Extra parens are needed for the C++03 definition of decltype. 1504 typedef decltype((__test_swap<_Tp, _Up>(0))) __swap1; 1505 typedef decltype((__test_swap<_Up, _Tp>(0))) __swap2; 1506 1507 static const bool value = _IsNotSame<__swap1, __nat>::value 1508 && _IsNotSame<__swap2, __nat>::value; 1509}; 1510 1511template <class _Tp, class _Up> 1512struct __swappable_with<_Tp, _Up, false> : false_type {}; 1513 1514template <class _Tp, class _Up = _Tp, bool _Swappable = __swappable_with<_Tp, _Up>::value> 1515struct __nothrow_swappable_with { 1516 static const bool value = 1517#ifndef _LIBCPP_HAS_NO_NOEXCEPT 1518 noexcept(swap(declval<_Tp>(), declval<_Up>())) 1519 && noexcept(swap(declval<_Up>(), declval<_Tp>())); 1520#else 1521 false; 1522#endif 1523}; 1524 1525template <class _Tp, class _Up> 1526struct __nothrow_swappable_with<_Tp, _Up, false> : false_type {}; 1527 1528} // namespace __detail 1529 1530template <class _Tp> 1531struct __is_swappable 1532 : public integral_constant<bool, __detail::__swappable_with<_Tp&>::value> 1533{ 1534}; 1535 1536template <class _Tp> 1537struct __is_nothrow_swappable 1538 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp&>::value> 1539{ 1540}; 1541 1542#if _LIBCPP_STD_VER > 14 1543 1544template <class _Tp, class _Up> 1545struct _LIBCPP_TEMPLATE_VIS is_swappable_with 1546 : public integral_constant<bool, __detail::__swappable_with<_Tp, _Up>::value> 1547{ 1548}; 1549 1550template <class _Tp> 1551struct _LIBCPP_TEMPLATE_VIS is_swappable 1552 : public conditional< 1553 __is_referenceable<_Tp>::value, 1554 is_swappable_with< 1555 typename add_lvalue_reference<_Tp>::type, 1556 typename add_lvalue_reference<_Tp>::type>, 1557 false_type 1558 >::type 1559{ 1560}; 1561 1562template <class _Tp, class _Up> 1563struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable_with 1564 : public integral_constant<bool, __detail::__nothrow_swappable_with<_Tp, _Up>::value> 1565{ 1566}; 1567 1568template <class _Tp> 1569struct _LIBCPP_TEMPLATE_VIS is_nothrow_swappable 1570 : public conditional< 1571 __is_referenceable<_Tp>::value, 1572 is_nothrow_swappable_with< 1573 typename add_lvalue_reference<_Tp>::type, 1574 typename add_lvalue_reference<_Tp>::type>, 1575 false_type 1576 >::type 1577{ 1578}; 1579 1580template <class _Tp, class _Up> 1581inline constexpr bool is_swappable_with_v = is_swappable_with<_Tp, _Up>::value; 1582 1583template <class _Tp> 1584inline constexpr bool is_swappable_v = is_swappable<_Tp>::value; 1585 1586template <class _Tp, class _Up> 1587inline constexpr bool is_nothrow_swappable_with_v = is_nothrow_swappable_with<_Tp, _Up>::value; 1588 1589template <class _Tp> 1590inline constexpr bool is_nothrow_swappable_v = is_nothrow_swappable<_Tp>::value; 1591 1592#endif // _LIBCPP_STD_VER > 14 1593 1594template <class _Tp, bool = is_enum<_Tp>::value> 1595struct __sfinae_underlying_type 1596{ 1597 typedef typename underlying_type<_Tp>::type type; 1598 typedef decltype(((type)1) + 0) __promoted_type; 1599}; 1600 1601template <class _Tp> 1602struct __sfinae_underlying_type<_Tp, false> {}; 1603 1604inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1605int __convert_to_integral(int __val) { return __val; } 1606 1607inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1608unsigned __convert_to_integral(unsigned __val) { return __val; } 1609 1610inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1611long __convert_to_integral(long __val) { return __val; } 1612 1613inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1614unsigned long __convert_to_integral(unsigned long __val) { return __val; } 1615 1616inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1617long long __convert_to_integral(long long __val) { return __val; } 1618 1619inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1620unsigned long long __convert_to_integral(unsigned long long __val) {return __val; } 1621 1622template<typename _Fp> 1623inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1624typename enable_if<is_floating_point<_Fp>::value, long long>::type 1625 __convert_to_integral(_Fp __val) { return __val; } 1626 1627#ifndef _LIBCPP_HAS_NO_INT128 1628inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1629__int128_t __convert_to_integral(__int128_t __val) { return __val; } 1630 1631inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1632__uint128_t __convert_to_integral(__uint128_t __val) { return __val; } 1633#endif 1634 1635template <class _Tp> 1636inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 1637typename __sfinae_underlying_type<_Tp>::__promoted_type 1638__convert_to_integral(_Tp __val) { return __val; } 1639 1640// These traits are used in __tree and __hash_table 1641struct __extract_key_fail_tag {}; 1642struct __extract_key_self_tag {}; 1643struct __extract_key_first_tag {}; 1644 1645template <class _ValTy, class _Key, 1646 class _RawValTy = typename __unconstref<_ValTy>::type> 1647struct __can_extract_key 1648 : conditional<_IsSame<_RawValTy, _Key>::value, __extract_key_self_tag, 1649 __extract_key_fail_tag>::type {}; 1650 1651template <class _Pair, class _Key, class _First, class _Second> 1652struct __can_extract_key<_Pair, _Key, pair<_First, _Second> > 1653 : conditional<_IsSame<typename remove_const<_First>::type, _Key>::value, 1654 __extract_key_first_tag, __extract_key_fail_tag>::type {}; 1655 1656// __can_extract_map_key uses true_type/false_type instead of the tags. 1657// It returns true if _Key != _ContainerValueTy (the container is a map not a set) 1658// and _ValTy == _Key. 1659template <class _ValTy, class _Key, class _ContainerValueTy, 1660 class _RawValTy = typename __unconstref<_ValTy>::type> 1661struct __can_extract_map_key 1662 : integral_constant<bool, _IsSame<_RawValTy, _Key>::value> {}; 1663 1664// This specialization returns __extract_key_fail_tag for non-map containers 1665// because _Key == _ContainerValueTy 1666template <class _ValTy, class _Key, class _RawValTy> 1667struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy> 1668 : false_type {}; 1669 1670template <class _CharT> 1671using _IsCharLikeType = _And<is_standard_layout<_CharT>, is_trivial<_CharT> >; 1672 1673template<class _Tp> 1674using __make_const_lvalue_ref = const typename remove_reference<_Tp>::type&; 1675 1676#if _LIBCPP_STD_VER > 17 1677template<bool _Const, class _Tp> 1678using __maybe_const = conditional_t<_Const, const _Tp, _Tp>; 1679#endif // _LIBCPP_STD_VER > 17 1680 1681_LIBCPP_END_NAMESPACE_STD 1682 1683#endif // _LIBCPP_TYPE_TRAITS 1684