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

source code of flutter_engine/third_party/libcxx/include/type_traits