libstdc++
type_traits
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1// C++11 <type_traits> -*- C++ -*-
2
3// Copyright (C) 2007-2020 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file include/type_traits
26 * This is a Standard C++ Library header.
27 */
28
29#ifndef _GLIBCXX_TYPE_TRAITS
30#define _GLIBCXX_TYPE_TRAITS 1
31
32#pragma GCC system_header
33
34#if __cplusplus < 201103L
35# include <bits/c++0x_warning.h>
36#else
37
38#include <bits/c++config.h>
39
40namespace std _GLIBCXX_VISIBILITY(default)
41{
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
43
44 /**
45 * @defgroup metaprogramming Metaprogramming
46 * @ingroup utilities
47 *
48 * Template utilities for compile-time introspection and modification,
49 * including type classification traits, type property inspection traits
50 * and type transformation traits.
51 *
52 * @{
53 */
54
55 /// integral_constant
56 template<typename _Tp, _Tp __v>
58 {
59 static constexpr _Tp value = __v;
60 typedef _Tp value_type;
62 constexpr operator value_type() const noexcept { return value; }
63#if __cplusplus > 201103L
64
65#define __cpp_lib_integral_constant_callable 201304
66
67 constexpr value_type operator()() const noexcept { return value; }
68#endif
69 };
70
71 template<typename _Tp, _Tp __v>
73
74 /// The type used as a compile-time boolean with true value.
76
77 /// The type used as a compile-time boolean with false value.
79
80 template<bool __v>
82
83#if __cplusplus > 201402L
84# define __cpp_lib_bool_constant 201505
85 template<bool __v>
86 using bool_constant = integral_constant<bool, __v>;
87#endif
88
89 // Meta programming helper types.
90
91 template<bool, typename, typename>
92 struct conditional;
93
94 template <typename _Type>
95 struct __type_identity
96 { using type = _Type; };
97
98 template<typename _Tp>
99 using __type_identity_t = typename __type_identity<_Tp>::type;
100
101 template<typename...>
102 struct __or_;
103
104 template<>
105 struct __or_<>
106 : public false_type
107 { };
108
109 template<typename _B1>
110 struct __or_<_B1>
111 : public _B1
112 { };
113
114 template<typename _B1, typename _B2>
115 struct __or_<_B1, _B2>
116 : public conditional<_B1::value, _B1, _B2>::type
117 { };
118
119 template<typename _B1, typename _B2, typename _B3, typename... _Bn>
120 struct __or_<_B1, _B2, _B3, _Bn...>
121 : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type
122 { };
123
124 template<typename...>
125 struct __and_;
126
127 template<>
128 struct __and_<>
129 : public true_type
130 { };
131
132 template<typename _B1>
133 struct __and_<_B1>
134 : public _B1
135 { };
136
137 template<typename _B1, typename _B2>
138 struct __and_<_B1, _B2>
139 : public conditional<_B1::value, _B2, _B1>::type
140 { };
141
142 template<typename _B1, typename _B2, typename _B3, typename... _Bn>
143 struct __and_<_B1, _B2, _B3, _Bn...>
144 : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
145 { };
146
147 template<typename _Pp>
148 struct __not_
149 : public __bool_constant<!bool(_Pp::value)>
150 { };
151
152#if __cplusplus >= 201703L
153
154 template<typename... _Bn>
155 inline constexpr bool __or_v = __or_<_Bn...>::value;
156 template<typename... _Bn>
157 inline constexpr bool __and_v = __and_<_Bn...>::value;
158
159#define __cpp_lib_logical_traits 201510
160
161 template<typename... _Bn>
162 struct conjunction
163 : __and_<_Bn...>
164 { };
165
166 template<typename... _Bn>
167 struct disjunction
168 : __or_<_Bn...>
169 { };
170
171 template<typename _Pp>
172 struct negation
173 : __not_<_Pp>
174 { };
175
176 template<typename... _Bn>
177 inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
178
179 template<typename... _Bn>
180 inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
181
182 template<typename _Pp>
183 inline constexpr bool negation_v = negation<_Pp>::value;
184
185#endif // C++17
186
187 // Forward declarations
188 template<typename>
189 struct is_reference;
190 template<typename>
191 struct is_function;
192 template<typename>
193 struct is_void;
194 template<typename>
195 struct __is_array_unknown_bounds;
196
197 // Helper functions that return false_type for incomplete classes,
198 // incomplete unions and arrays of known bound from those.
199
200 template <typename _T, size_t = sizeof(_T)>
201 constexpr true_type __is_complete_or_unbounded(__type_identity<_T>)
202 { return {}; }
203
204 template <typename _TypeIdentity,
205 typename _NestedType = typename _TypeIdentity::type>
206 constexpr typename __or_<
207 is_reference<_NestedType>,
208 is_function<_NestedType>,
209 is_void<_NestedType>,
210 __is_array_unknown_bounds<_NestedType>
211 >::type __is_complete_or_unbounded(_TypeIdentity)
212 { return {}; }
213
214 // For several sfinae-friendly trait implementations we transport both the
215 // result information (as the member type) and the failure information (no
216 // member type). This is very similar to std::enable_if, but we cannot use
217 // them, because we need to derive from them as an implementation detail.
218
219 template<typename _Tp>
220 struct __success_type
221 { typedef _Tp type; };
222
223 struct __failure_type
224 { };
225
226 template<typename>
227 struct remove_cv;
228
229 // __remove_cv_t (std::remove_cv_t for C++11).
230 template<typename _Tp>
231 using __remove_cv_t = typename remove_cv<_Tp>::type;
232
233 template<typename>
234 struct is_const;
235
236 // Primary type categories.
237
238 template<typename>
239 struct __is_void_helper
240 : public false_type { };
241
242 template<>
243 struct __is_void_helper<void>
244 : public true_type { };
245
246 /// is_void
247 template<typename _Tp>
248 struct is_void
249 : public __is_void_helper<__remove_cv_t<_Tp>>::type
250 { };
251
252 template<typename>
253 struct __is_integral_helper
254 : public false_type { };
255
256 template<>
257 struct __is_integral_helper<bool>
258 : public true_type { };
259
260 template<>
261 struct __is_integral_helper<char>
262 : public true_type { };
263
264 template<>
265 struct __is_integral_helper<signed char>
266 : public true_type { };
267
268 template<>
269 struct __is_integral_helper<unsigned char>
270 : public true_type { };
271
272#ifdef _GLIBCXX_USE_WCHAR_T
273 template<>
274 struct __is_integral_helper<wchar_t>
275 : public true_type { };
276#endif
277
278#ifdef _GLIBCXX_USE_CHAR8_T
279 template<>
280 struct __is_integral_helper<char8_t>
281 : public true_type { };
282#endif
283
284 template<>
285 struct __is_integral_helper<char16_t>
286 : public true_type { };
287
288 template<>
289 struct __is_integral_helper<char32_t>
290 : public true_type { };
291
292 template<>
293 struct __is_integral_helper<short>
294 : public true_type { };
295
296 template<>
297 struct __is_integral_helper<unsigned short>
298 : public true_type { };
299
300 template<>
301 struct __is_integral_helper<int>
302 : public true_type { };
303
304 template<>
305 struct __is_integral_helper<unsigned int>
306 : public true_type { };
307
308 template<>
309 struct __is_integral_helper<long>
310 : public true_type { };
311
312 template<>
313 struct __is_integral_helper<unsigned long>
314 : public true_type { };
315
316 template<>
317 struct __is_integral_helper<long long>
318 : public true_type { };
319
320 template<>
321 struct __is_integral_helper<unsigned long long>
322 : public true_type { };
323
324 // Conditionalizing on __STRICT_ANSI__ here will break any port that
325 // uses one of these types for size_t.
326#if defined(__GLIBCXX_TYPE_INT_N_0)
327 template<>
328 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
329 : public true_type { };
330
331 template<>
332 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
333 : public true_type { };
334#endif
335#if defined(__GLIBCXX_TYPE_INT_N_1)
336 template<>
337 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
338 : public true_type { };
339
340 template<>
341 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
342 : public true_type { };
343#endif
344#if defined(__GLIBCXX_TYPE_INT_N_2)
345 template<>
346 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
347 : public true_type { };
348
349 template<>
350 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
351 : public true_type { };
352#endif
353#if defined(__GLIBCXX_TYPE_INT_N_3)
354 template<>
355 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
356 : public true_type { };
357
358 template<>
359 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
360 : public true_type { };
361#endif
362
363 /// is_integral
364 template<typename _Tp>
366 : public __is_integral_helper<__remove_cv_t<_Tp>>::type
367 { };
368
369 template<typename>
370 struct __is_floating_point_helper
371 : public false_type { };
372
373 template<>
374 struct __is_floating_point_helper<float>
375 : public true_type { };
376
377 template<>
378 struct __is_floating_point_helper<double>
379 : public true_type { };
380
381 template<>
382 struct __is_floating_point_helper<long double>
383 : public true_type { };
384
385#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) && !defined(__CUDACC__)
386 template<>
387 struct __is_floating_point_helper<__float128>
388 : public true_type { };
389#endif
390
391 /// is_floating_point
392 template<typename _Tp>
394 : public __is_floating_point_helper<__remove_cv_t<_Tp>>::type
395 { };
396
397 /// is_array
398 template<typename>
399 struct is_array
400 : public false_type { };
401
402 template<typename _Tp, std::size_t _Size>
403 struct is_array<_Tp[_Size]>
404 : public true_type { };
405
406 template<typename _Tp>
407 struct is_array<_Tp[]>
408 : public true_type { };
409
410 template<typename>
411 struct __is_pointer_helper
412 : public false_type { };
413
414 template<typename _Tp>
415 struct __is_pointer_helper<_Tp*>
416 : public true_type { };
417
418 /// is_pointer
419 template<typename _Tp>
421 : public __is_pointer_helper<__remove_cv_t<_Tp>>::type
422 { };
423
424 /// is_lvalue_reference
425 template<typename>
427 : public false_type { };
428
429 template<typename _Tp>
430 struct is_lvalue_reference<_Tp&>
431 : public true_type { };
432
433 /// is_rvalue_reference
434 template<typename>
436 : public false_type { };
437
438 template<typename _Tp>
439 struct is_rvalue_reference<_Tp&&>
440 : public true_type { };
441
442 template<typename>
443 struct __is_member_object_pointer_helper
444 : public false_type { };
445
446 template<typename _Tp, typename _Cp>
447 struct __is_member_object_pointer_helper<_Tp _Cp::*>
448 : public __not_<is_function<_Tp>>::type { };
449
450 /// is_member_object_pointer
451 template<typename _Tp>
453 : public __is_member_object_pointer_helper<__remove_cv_t<_Tp>>::type
454 { };
455
456 template<typename>
457 struct __is_member_function_pointer_helper
458 : public false_type { };
459
460 template<typename _Tp, typename _Cp>
461 struct __is_member_function_pointer_helper<_Tp _Cp::*>
462 : public is_function<_Tp>::type { };
463
464 /// is_member_function_pointer
465 template<typename _Tp>
467 : public __is_member_function_pointer_helper<__remove_cv_t<_Tp>>::type
468 { };
469
470 /// is_enum
471 template<typename _Tp>
472 struct is_enum
473 : public integral_constant<bool, __is_enum(_Tp)>
474 { };
475
476 /// is_union
477 template<typename _Tp>
478 struct is_union
479 : public integral_constant<bool, __is_union(_Tp)>
480 { };
481
482 /// is_class
483 template<typename _Tp>
484 struct is_class
485 : public integral_constant<bool, __is_class(_Tp)>
486 { };
487
488 /// is_function
489 template<typename _Tp>
491 : public __bool_constant<!is_const<const _Tp>::value> { };
492
493 template<typename _Tp>
494 struct is_function<_Tp&>
495 : public false_type { };
496
497 template<typename _Tp>
498 struct is_function<_Tp&&>
499 : public false_type { };
500
501#define __cpp_lib_is_null_pointer 201309
502
503 template<typename>
504 struct __is_null_pointer_helper
505 : public false_type { };
506
507 template<>
508 struct __is_null_pointer_helper<std::nullptr_t>
509 : public true_type { };
510
511 /// is_null_pointer (LWG 2247).
512 template<typename _Tp>
514 : public __is_null_pointer_helper<__remove_cv_t<_Tp>>::type
515 { };
516
517 /// __is_nullptr_t (deprecated extension).
518 template<typename _Tp>
520 : public is_null_pointer<_Tp>
521 { } _GLIBCXX_DEPRECATED;
522
523 // Composite type categories.
524
525 /// is_reference
526 template<typename _Tp>
528 : public __or_<is_lvalue_reference<_Tp>,
529 is_rvalue_reference<_Tp>>::type
530 { };
531
532 /// is_arithmetic
533 template<typename _Tp>
535 : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
536 { };
537
538 /// is_fundamental
539 template<typename _Tp>
541 : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
542 is_null_pointer<_Tp>>::type
543 { };
544
545 /// is_object
546 template<typename _Tp>
548 : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
549 is_void<_Tp>>>::type
550 { };
551
552 template<typename>
553 struct is_member_pointer;
554
555 /// is_scalar
556 template<typename _Tp>
558 : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
559 is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
560 { };
561
562 /// is_compound
563 template<typename _Tp>
565 : public __not_<is_fundamental<_Tp>>::type { };
566
567 template<typename _Tp>
568 struct __is_member_pointer_helper
569 : public false_type { };
570
571 template<typename _Tp, typename _Cp>
572 struct __is_member_pointer_helper<_Tp _Cp::*>
573 : public true_type { };
574
575 /// is_member_pointer
576 template<typename _Tp>
578 : public __is_member_pointer_helper<__remove_cv_t<_Tp>>::type
579 { };
580
581 template<typename, typename>
582 struct is_same;
583
584 template<typename _Tp, typename... _Types>
585 using __is_one_of = __or_<is_same<_Tp, _Types>...>;
586
587 // Check if a type is one of the signed integer types.
588 template<typename _Tp>
589 using __is_signed_integer = __is_one_of<__remove_cv_t<_Tp>,
590 signed char, signed short, signed int, signed long,
591 signed long long
592#if defined(__GLIBCXX_TYPE_INT_N_0)
593 , signed __GLIBCXX_TYPE_INT_N_0
594#endif
595#if defined(__GLIBCXX_TYPE_INT_N_1)
596 , signed __GLIBCXX_TYPE_INT_N_1
597#endif
598#if defined(__GLIBCXX_TYPE_INT_N_2)
599 , signed __GLIBCXX_TYPE_INT_N_2
600#endif
601#if defined(__GLIBCXX_TYPE_INT_N_3)
602 , signed __GLIBCXX_TYPE_INT_N_3
603#endif
604 >;
605
606 // Check if a type is one of the unsigned integer types.
607 template<typename _Tp>
608 using __is_unsigned_integer = __is_one_of<__remove_cv_t<_Tp>,
609 unsigned char, unsigned short, unsigned int, unsigned long,
610 unsigned long long
611#if defined(__GLIBCXX_TYPE_INT_N_0)
612 , unsigned __GLIBCXX_TYPE_INT_N_0
613#endif
614#if defined(__GLIBCXX_TYPE_INT_N_1)
615 , unsigned __GLIBCXX_TYPE_INT_N_1
616#endif
617#if defined(__GLIBCXX_TYPE_INT_N_2)
618 , unsigned __GLIBCXX_TYPE_INT_N_2
619#endif
620#if defined(__GLIBCXX_TYPE_INT_N_3)
621 , unsigned __GLIBCXX_TYPE_INT_N_3
622#endif
623 >;
624
625 // Check if a type is one of the signed or unsigned integer types.
626 template<typename _Tp>
627 using __is_standard_integer
628 = __or_<__is_signed_integer<_Tp>, __is_unsigned_integer<_Tp>>;
629
630 // __void_t (std::void_t for C++11)
631 template<typename...> using __void_t = void;
632
633 // Utility to detect referenceable types ([defns.referenceable]).
634
635 template<typename _Tp, typename = void>
636 struct __is_referenceable
637 : public false_type
638 { };
639
640 template<typename _Tp>
641 struct __is_referenceable<_Tp, __void_t<_Tp&>>
642 : public true_type
643 { };
644
645 // Type properties.
646
647 /// is_const
648 template<typename>
649 struct is_const
650 : public false_type { };
651
652 template<typename _Tp>
653 struct is_const<_Tp const>
654 : public true_type { };
655
656 /// is_volatile
657 template<typename>
659 : public false_type { };
660
661 template<typename _Tp>
662 struct is_volatile<_Tp volatile>
663 : public true_type { };
664
665 /// is_trivial
666 template<typename _Tp>
668 : public integral_constant<bool, __is_trivial(_Tp)>
669 {
670 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
671 "template argument must be a complete class or an unbounded array");
672 };
673
674 // is_trivially_copyable
675 template<typename _Tp>
676 struct is_trivially_copyable
677 : public integral_constant<bool, __is_trivially_copyable(_Tp)>
678 {
679 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
680 "template argument must be a complete class or an unbounded array");
681 };
682
683 /// is_standard_layout
684 template<typename _Tp>
686 : public integral_constant<bool, __is_standard_layout(_Tp)>
687 {
688 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
689 "template argument must be a complete class or an unbounded array");
690 };
691
692 /// is_pod (deprecated in C++20)
693 // Could use is_standard_layout && is_trivial instead of the builtin.
694 template<typename _Tp>
695 struct
696 _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead")
697 is_pod
698 : public integral_constant<bool, __is_pod(_Tp)>
699 {
700 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
701 "template argument must be a complete class or an unbounded array");
702 };
703
704 /// is_literal_type
705 template<typename _Tp>
707 : public integral_constant<bool, __is_literal_type(_Tp)>
708 {
709 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
710 "template argument must be a complete class or an unbounded array");
711 };
712
713 /// is_empty
714 template<typename _Tp>
715 struct is_empty
716 : public integral_constant<bool, __is_empty(_Tp)>
717 { };
718
719 /// is_polymorphic
720 template<typename _Tp>
722 : public integral_constant<bool, __is_polymorphic(_Tp)>
723 { };
724
725#if __cplusplus >= 201402L
726#define __cpp_lib_is_final 201402L
727 /// is_final
728 template<typename _Tp>
729 struct is_final
730 : public integral_constant<bool, __is_final(_Tp)>
731 { };
732#endif
733
734 /// is_abstract
735 template<typename _Tp>
737 : public integral_constant<bool, __is_abstract(_Tp)>
738 { };
739
740 template<typename _Tp,
742 struct __is_signed_helper
743 : public false_type { };
744
745 template<typename _Tp>
746 struct __is_signed_helper<_Tp, true>
747 : public integral_constant<bool, _Tp(-1) < _Tp(0)>
748 { };
749
750 /// is_signed
751 template<typename _Tp>
752 struct is_signed
753 : public __is_signed_helper<_Tp>::type
754 { };
755
756 /// is_unsigned
757 template<typename _Tp>
758 struct is_unsigned
759 : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
760 { };
761
762
763 // Destructible and constructible type properties.
764
765 /**
766 * @brief Utility to simplify expressions used in unevaluated operands
767 * @ingroup utilities
768 */
769
770 template<typename _Tp, typename _Up = _Tp&&>
771 _Up
772 __declval(int);
773
774 template<typename _Tp>
775 _Tp
776 __declval(long);
777
778 template<typename _Tp>
779 auto declval() noexcept -> decltype(__declval<_Tp>(0));
780
781 template<typename, unsigned = 0>
782 struct extent;
783
784 template<typename>
785 struct remove_all_extents;
786
787 template<typename _Tp>
788 struct __is_array_known_bounds
789 : public integral_constant<bool, (extent<_Tp>::value > 0)>
790 { };
791
792 template<typename _Tp>
793 struct __is_array_unknown_bounds
794 : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
795 { };
796
797 // In N3290 is_destructible does not say anything about function
798 // types and abstract types, see LWG 2049. This implementation
799 // describes function types as non-destructible and all complete
800 // object types as destructible, iff the explicit destructor
801 // call expression is wellformed.
802 struct __do_is_destructible_impl
803 {
804 template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
805 static true_type __test(int);
806
807 template<typename>
808 static false_type __test(...);
809 };
810
811 template<typename _Tp>
812 struct __is_destructible_impl
813 : public __do_is_destructible_impl
814 {
815 typedef decltype(__test<_Tp>(0)) type;
816 };
817
818 template<typename _Tp,
819 bool = __or_<is_void<_Tp>,
820 __is_array_unknown_bounds<_Tp>,
821 is_function<_Tp>>::value,
822 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
823 struct __is_destructible_safe;
824
825 template<typename _Tp>
826 struct __is_destructible_safe<_Tp, false, false>
827 : public __is_destructible_impl<typename
828 remove_all_extents<_Tp>::type>::type
829 { };
830
831 template<typename _Tp>
832 struct __is_destructible_safe<_Tp, true, false>
833 : public false_type { };
834
835 template<typename _Tp>
836 struct __is_destructible_safe<_Tp, false, true>
837 : public true_type { };
838
839 /// is_destructible
840 template<typename _Tp>
842 : public __is_destructible_safe<_Tp>::type
843 {
844 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
845 "template argument must be a complete class or an unbounded array");
846 };
847
848 // is_nothrow_destructible requires that is_destructible is
849 // satisfied as well. We realize that by mimicing the
850 // implementation of is_destructible but refer to noexcept(expr)
851 // instead of decltype(expr).
852 struct __do_is_nt_destructible_impl
853 {
854 template<typename _Tp>
856 __test(int);
857
858 template<typename>
859 static false_type __test(...);
860 };
861
862 template<typename _Tp>
863 struct __is_nt_destructible_impl
864 : public __do_is_nt_destructible_impl
865 {
866 typedef decltype(__test<_Tp>(0)) type;
867 };
868
869 template<typename _Tp,
870 bool = __or_<is_void<_Tp>,
871 __is_array_unknown_bounds<_Tp>,
872 is_function<_Tp>>::value,
873 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
874 struct __is_nt_destructible_safe;
875
876 template<typename _Tp>
877 struct __is_nt_destructible_safe<_Tp, false, false>
878 : public __is_nt_destructible_impl<typename
879 remove_all_extents<_Tp>::type>::type
880 { };
881
882 template<typename _Tp>
883 struct __is_nt_destructible_safe<_Tp, true, false>
884 : public false_type { };
885
886 template<typename _Tp>
887 struct __is_nt_destructible_safe<_Tp, false, true>
888 : public true_type { };
889
890 /// is_nothrow_destructible
891 template<typename _Tp>
893 : public __is_nt_destructible_safe<_Tp>::type
894 {
895 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
896 "template argument must be a complete class or an unbounded array");
897 };
898
899 template<typename _Tp, typename... _Args>
900 struct __is_constructible_impl
901 : public __bool_constant<__is_constructible(_Tp, _Args...)>
902 { };
903
904 /// is_constructible
905 template<typename _Tp, typename... _Args>
907 : public __is_constructible_impl<_Tp, _Args...>
908 {
909 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
910 "template argument must be a complete class or an unbounded array");
911 };
912
913 /// is_default_constructible
914 template<typename _Tp>
916 : public __is_constructible_impl<_Tp>::type
917 {
918 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
919 "template argument must be a complete class or an unbounded array");
920 };
921
922 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
923 struct __is_copy_constructible_impl;
924
925 template<typename _Tp>
926 struct __is_copy_constructible_impl<_Tp, false>
927 : public false_type { };
928
929 template<typename _Tp>
930 struct __is_copy_constructible_impl<_Tp, true>
931 : public __is_constructible_impl<_Tp, const _Tp&>
932 { };
933
934 /// is_copy_constructible
935 template<typename _Tp>
937 : public __is_copy_constructible_impl<_Tp>
938 {
939 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
940 "template argument must be a complete class or an unbounded array");
941 };
942
943 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
944 struct __is_move_constructible_impl;
945
946 template<typename _Tp>
947 struct __is_move_constructible_impl<_Tp, false>
948 : public false_type { };
949
950 template<typename _Tp>
951 struct __is_move_constructible_impl<_Tp, true>
952 : public __is_constructible_impl<_Tp, _Tp&&>
953 { };
954
955 /// is_move_constructible
956 template<typename _Tp>
958 : public __is_move_constructible_impl<_Tp>
959 {
960 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
961 "template argument must be a complete class or an unbounded array");
962 };
963
964 template<bool, typename _Tp, typename... _Args>
965 struct __is_nt_constructible_impl
966 : public false_type
967 { };
968
969 template<typename _Tp, typename... _Args>
970 struct __is_nt_constructible_impl<true, _Tp, _Args...>
971 : public __bool_constant<noexcept(_Tp(std::declval<_Args>()...))>
972 { };
973
974 template<typename _Tp, typename _Arg>
975 struct __is_nt_constructible_impl<true, _Tp, _Arg>
976 : public __bool_constant<noexcept(static_cast<_Tp>(std::declval<_Arg>()))>
977 { };
978
979 template<typename _Tp>
980 struct __is_nt_constructible_impl<true, _Tp>
981 : public __bool_constant<noexcept(_Tp())>
982 { };
983
984 template<typename _Tp, size_t _Num>
985 struct __is_nt_constructible_impl<true, _Tp[_Num]>
986 : public __bool_constant<noexcept(typename remove_all_extents<_Tp>::type())>
987 { };
988
989 template<typename _Tp, typename... _Args>
990 using __is_nothrow_constructible_impl
991 = __is_nt_constructible_impl<__is_constructible(_Tp, _Args...),
992 _Tp, _Args...>;
993
994 /// is_nothrow_constructible
995 template<typename _Tp, typename... _Args>
997 : public __is_nothrow_constructible_impl<_Tp, _Args...>::type
998 {
999 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1000 "template argument must be a complete class or an unbounded array");
1001 };
1002
1003 /// is_nothrow_default_constructible
1004 template<typename _Tp>
1006 : public __is_nothrow_constructible_impl<_Tp>::type
1007 {
1008 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1009 "template argument must be a complete class or an unbounded array");
1010 };
1011
1012
1013 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1014 struct __is_nothrow_copy_constructible_impl;
1015
1016 template<typename _Tp>
1017 struct __is_nothrow_copy_constructible_impl<_Tp, false>
1018 : public false_type { };
1019
1020 template<typename _Tp>
1021 struct __is_nothrow_copy_constructible_impl<_Tp, true>
1022 : public __is_nothrow_constructible_impl<_Tp, const _Tp&>
1023 { };
1024
1025 /// is_nothrow_copy_constructible
1026 template<typename _Tp>
1028 : public __is_nothrow_copy_constructible_impl<_Tp>::type
1029 {
1030 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1031 "template argument must be a complete class or an unbounded array");
1032 };
1033
1034 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1035 struct __is_nothrow_move_constructible_impl;
1036
1037 template<typename _Tp>
1038 struct __is_nothrow_move_constructible_impl<_Tp, false>
1039 : public false_type { };
1040
1041 template<typename _Tp>
1042 struct __is_nothrow_move_constructible_impl<_Tp, true>
1043 : public __is_nothrow_constructible_impl<_Tp, _Tp&&>
1044 { };
1045
1046 /// is_nothrow_move_constructible
1047 template<typename _Tp>
1049 : public __is_nothrow_move_constructible_impl<_Tp>::type
1050 {
1051 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1052 "template argument must be a complete class or an unbounded array");
1053 };
1054
1055 /// is_assignable
1056 template<typename _Tp, typename _Up>
1058 : public __bool_constant<__is_assignable(_Tp, _Up)>
1059 {
1060 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1061 "template argument must be a complete class or an unbounded array");
1062 };
1063
1064 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1065 struct __is_copy_assignable_impl;
1066
1067 template<typename _Tp>
1068 struct __is_copy_assignable_impl<_Tp, false>
1069 : public false_type { };
1070
1071 template<typename _Tp>
1072 struct __is_copy_assignable_impl<_Tp, true>
1073 : public __bool_constant<__is_assignable(_Tp&, const _Tp&)>
1074 { };
1075
1076 /// is_copy_assignable
1077 template<typename _Tp>
1079 : public __is_copy_assignable_impl<_Tp>::type
1080 {
1081 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1082 "template argument must be a complete class or an unbounded array");
1083 };
1084
1085 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1086 struct __is_move_assignable_impl;
1087
1088 template<typename _Tp>
1089 struct __is_move_assignable_impl<_Tp, false>
1090 : public false_type { };
1091
1092 template<typename _Tp>
1093 struct __is_move_assignable_impl<_Tp, true>
1094 : public __bool_constant<__is_assignable(_Tp&, _Tp&&)>
1095 { };
1096
1097 /// is_move_assignable
1098 template<typename _Tp>
1100 : public __is_move_assignable_impl<_Tp>::type
1101 {
1102 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1103 "template argument must be a complete class or an unbounded array");
1104 };
1105
1106 template<typename _Tp, typename _Up>
1107 struct __is_nt_assignable_impl
1108 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1109 { };
1110
1111 template<typename _Tp, typename _Up>
1112 struct __is_nothrow_assignable_impl
1113 : public __and_<__bool_constant<__is_assignable(_Tp, _Up)>,
1114 __is_nt_assignable_impl<_Tp, _Up>>
1115 { };
1116
1117 /// is_nothrow_assignable
1118 template<typename _Tp, typename _Up>
1120 : public __is_nothrow_assignable_impl<_Tp, _Up>
1121 {
1122 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1123 "template argument must be a complete class or an unbounded array");
1124 };
1125
1126 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1127 struct __is_nt_copy_assignable_impl;
1128
1129 template<typename _Tp>
1130 struct __is_nt_copy_assignable_impl<_Tp, false>
1131 : public false_type { };
1132
1133 template<typename _Tp>
1134 struct __is_nt_copy_assignable_impl<_Tp, true>
1135 : public __is_nothrow_assignable_impl<_Tp&, const _Tp&>
1136 { };
1137
1138 /// is_nothrow_copy_assignable
1139 template<typename _Tp>
1141 : public __is_nt_copy_assignable_impl<_Tp>
1142 {
1143 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1144 "template argument must be a complete class or an unbounded array");
1145 };
1146
1147 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1148 struct __is_nt_move_assignable_impl;
1149
1150 template<typename _Tp>
1151 struct __is_nt_move_assignable_impl<_Tp, false>
1152 : public false_type { };
1153
1154 template<typename _Tp>
1155 struct __is_nt_move_assignable_impl<_Tp, true>
1156 : public __is_nothrow_assignable_impl<_Tp&, _Tp&&>
1157 { };
1158
1159 /// is_nothrow_move_assignable
1160 template<typename _Tp>
1162 : public __is_nt_move_assignable_impl<_Tp>
1163 {
1164 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1165 "template argument must be a complete class or an unbounded array");
1166 };
1167
1168 /// is_trivially_constructible
1169 template<typename _Tp, typename... _Args>
1171 : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
1172 {
1173 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1174 "template argument must be a complete class or an unbounded array");
1175 };
1176
1177 /// is_trivially_default_constructible
1178 template<typename _Tp>
1180 : public __bool_constant<__is_trivially_constructible(_Tp)>
1181 {
1182 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1183 "template argument must be a complete class or an unbounded array");
1184 };
1185
1186 struct __do_is_implicitly_default_constructible_impl
1187 {
1188 template <typename _Tp>
1189 static void __helper(const _Tp&);
1190
1191 template <typename _Tp>
1192 static true_type __test(const _Tp&,
1193 decltype(__helper<const _Tp&>({}))* = 0);
1194
1195 static false_type __test(...);
1196 };
1197
1198 template<typename _Tp>
1199 struct __is_implicitly_default_constructible_impl
1200 : public __do_is_implicitly_default_constructible_impl
1201 {
1202 typedef decltype(__test(declval<_Tp>())) type;
1203 };
1204
1205 template<typename _Tp>
1206 struct __is_implicitly_default_constructible_safe
1207 : public __is_implicitly_default_constructible_impl<_Tp>::type
1208 { };
1209
1210 template <typename _Tp>
1211 struct __is_implicitly_default_constructible
1212 : public __and_<__is_constructible_impl<_Tp>,
1213 __is_implicitly_default_constructible_safe<_Tp>>
1214 { };
1215
1216 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1217 struct __is_trivially_copy_constructible_impl;
1218
1219 template<typename _Tp>
1220 struct __is_trivially_copy_constructible_impl<_Tp, false>
1221 : public false_type { };
1222
1223 template<typename _Tp>
1224 struct __is_trivially_copy_constructible_impl<_Tp, true>
1225 : public __and_<__is_copy_constructible_impl<_Tp>,
1226 integral_constant<bool,
1227 __is_trivially_constructible(_Tp, const _Tp&)>>
1228 { };
1229
1230 /// is_trivially_copy_constructible
1231 template<typename _Tp>
1233 : public __is_trivially_copy_constructible_impl<_Tp>
1234 {
1235 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1236 "template argument must be a complete class or an unbounded array");
1237 };
1238
1239 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1240 struct __is_trivially_move_constructible_impl;
1241
1242 template<typename _Tp>
1243 struct __is_trivially_move_constructible_impl<_Tp, false>
1244 : public false_type { };
1245
1246 template<typename _Tp>
1247 struct __is_trivially_move_constructible_impl<_Tp, true>
1248 : public __and_<__is_move_constructible_impl<_Tp>,
1249 integral_constant<bool,
1250 __is_trivially_constructible(_Tp, _Tp&&)>>
1251 { };
1252
1253 /// is_trivially_move_constructible
1254 template<typename _Tp>
1256 : public __is_trivially_move_constructible_impl<_Tp>
1257 {
1258 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1259 "template argument must be a complete class or an unbounded array");
1260 };
1261
1262 /// is_trivially_assignable
1263 template<typename _Tp, typename _Up>
1265 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1266 {
1267 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1268 "template argument must be a complete class or an unbounded array");
1269 };
1270
1271 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1272 struct __is_trivially_copy_assignable_impl;
1273
1274 template<typename _Tp>
1275 struct __is_trivially_copy_assignable_impl<_Tp, false>
1276 : public false_type { };
1277
1278 template<typename _Tp>
1279 struct __is_trivially_copy_assignable_impl<_Tp, true>
1280 : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
1281 { };
1282
1283 /// is_trivially_copy_assignable
1284 template<typename _Tp>
1286 : public __is_trivially_copy_assignable_impl<_Tp>
1287 {
1288 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1289 "template argument must be a complete class or an unbounded array");
1290 };
1291
1292 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1293 struct __is_trivially_move_assignable_impl;
1294
1295 template<typename _Tp>
1296 struct __is_trivially_move_assignable_impl<_Tp, false>
1297 : public false_type { };
1298
1299 template<typename _Tp>
1300 struct __is_trivially_move_assignable_impl<_Tp, true>
1301 : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
1302 { };
1303
1304 /// is_trivially_move_assignable
1305 template<typename _Tp>
1307 : public __is_trivially_move_assignable_impl<_Tp>
1308 {
1309 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1310 "template argument must be a complete class or an unbounded array");
1311 };
1312
1313 /// is_trivially_destructible
1314 template<typename _Tp>
1316 : public __and_<__is_destructible_safe<_Tp>,
1317 __bool_constant<__has_trivial_destructor(_Tp)>>
1318 {
1319 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1320 "template argument must be a complete class or an unbounded array");
1321 };
1322
1323
1324 /// has_virtual_destructor
1325 template<typename _Tp>
1327 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1328 {
1329 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1330 "template argument must be a complete class or an unbounded array");
1331 };
1332
1333
1334 // type property queries.
1335
1336 /// alignment_of
1337 template<typename _Tp>
1339 : public integral_constant<std::size_t, alignof(_Tp)>
1340 {
1341 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
1342 "template argument must be a complete class or an unbounded array");
1343 };
1344
1345 /// rank
1346 template<typename>
1347 struct rank
1348 : public integral_constant<std::size_t, 0> { };
1349
1350 template<typename _Tp, std::size_t _Size>
1351 struct rank<_Tp[_Size]>
1352 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1353
1354 template<typename _Tp>
1355 struct rank<_Tp[]>
1356 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1357
1358 /// extent
1359 template<typename, unsigned _Uint>
1360 struct extent
1361 : public integral_constant<std::size_t, 0> { };
1362
1363 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1364 struct extent<_Tp[_Size], _Uint>
1365 : public integral_constant<std::size_t,
1366 _Uint == 0 ? _Size : extent<_Tp,
1367 _Uint - 1>::value>
1368 { };
1369
1370 template<typename _Tp, unsigned _Uint>
1371 struct extent<_Tp[], _Uint>
1372 : public integral_constant<std::size_t,
1373 _Uint == 0 ? 0 : extent<_Tp,
1374 _Uint - 1>::value>
1375 { };
1376
1377
1378 // Type relations.
1379
1380 /// is_same
1381 template<typename _Tp, typename _Up>
1382 struct is_same
1383#ifdef _GLIBCXX_BUILTIN_IS_SAME_AS
1384 : public integral_constant<bool, _GLIBCXX_BUILTIN_IS_SAME_AS(_Tp, _Up)>
1385#else
1386 : public false_type
1387#endif
1388 { };
1389
1390#ifndef _GLIBCXX_BUILTIN_IS_SAME_AS
1391 template<typename _Tp>
1392 struct is_same<_Tp, _Tp>
1393 : public true_type
1394 { };
1395#endif
1396
1397 /// is_base_of
1398 template<typename _Base, typename _Derived>
1400 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1401 { };
1402
1403 template<typename _From, typename _To,
1404 bool = __or_<is_void<_From>, is_function<_To>,
1405 is_array<_To>>::value>
1406 struct __is_convertible_helper
1407 {
1408 typedef typename is_void<_To>::type type;
1409 };
1410
1411#pragma GCC diagnostic push
1412#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
1413 template<typename _From, typename _To>
1414 class __is_convertible_helper<_From, _To, false>
1415 {
1416 template<typename _To1>
1417 static void __test_aux(_To1) noexcept;
1418
1419 template<typename _From1, typename _To1,
1420 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1421 static true_type
1422 __test(int);
1423
1424 template<typename, typename>
1425 static false_type
1426 __test(...);
1427
1428 public:
1429 typedef decltype(__test<_From, _To>(0)) type;
1430 };
1431#pragma GCC diagnostic pop
1432
1433 /// is_convertible
1434 template<typename _From, typename _To>
1436 : public __is_convertible_helper<_From, _To>::type
1437 { };
1438
1439 // helper trait for unique_ptr<T[]>, shared_ptr<T[]>, and span<T, N>
1440 template<typename _ToElementType, typename _FromElementType>
1442 = is_convertible<_FromElementType(*)[], _ToElementType(*)[]>;
1443
1444 template<typename _From, typename _To,
1445 bool = __or_<is_void<_From>, is_function<_To>,
1446 is_array<_To>>::value>
1447 struct __is_nt_convertible_helper
1448 : is_void<_To>
1449 { };
1450
1451#pragma GCC diagnostic push
1452#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
1453 template<typename _From, typename _To>
1454 class __is_nt_convertible_helper<_From, _To, false>
1455 {
1456 template<typename _To1>
1457 static void __test_aux(_To1) noexcept;
1458
1459 template<typename _From1, typename _To1>
1460 static
1461 __bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
1462 __test(int);
1463
1464 template<typename, typename>
1465 static false_type
1466 __test(...);
1467
1468 public:
1469 using type = decltype(__test<_From, _To>(0));
1470 };
1471#pragma GCC diagnostic pop
1472
1473 // is_nothrow_convertible for C++11
1474 template<typename _From, typename _To>
1475 struct __is_nothrow_convertible
1476 : public __is_nt_convertible_helper<_From, _To>::type
1477 { };
1478
1479#if __cplusplus > 201703L
1480 /// is_nothrow_convertible
1481 template<typename _From, typename _To>
1482 struct is_nothrow_convertible
1483 : public __is_nt_convertible_helper<_From, _To>::type
1484 { };
1485
1486 /// is_nothrow_convertible_v
1487 template<typename _From, typename _To>
1488 inline constexpr bool is_nothrow_convertible_v
1489 = is_nothrow_convertible<_From, _To>::value;
1490#endif // C++2a
1491
1492 // Const-volatile modifications.
1493
1494 /// remove_const
1495 template<typename _Tp>
1497 { typedef _Tp type; };
1498
1499 template<typename _Tp>
1500 struct remove_const<_Tp const>
1501 { typedef _Tp type; };
1502
1503 /// remove_volatile
1504 template<typename _Tp>
1506 { typedef _Tp type; };
1507
1508 template<typename _Tp>
1509 struct remove_volatile<_Tp volatile>
1510 { typedef _Tp type; };
1511
1512 /// remove_cv
1513 template<typename _Tp>
1515 { using type = _Tp; };
1516
1517 template<typename _Tp>
1518 struct remove_cv<const _Tp>
1519 { using type = _Tp; };
1520
1521 template<typename _Tp>
1522 struct remove_cv<volatile _Tp>
1523 { using type = _Tp; };
1524
1525 template<typename _Tp>
1526 struct remove_cv<const volatile _Tp>
1527 { using type = _Tp; };
1528
1529 /// add_const
1530 template<typename _Tp>
1532 { typedef _Tp const type; };
1533
1534 /// add_volatile
1535 template<typename _Tp>
1537 { typedef _Tp volatile type; };
1538
1539 /// add_cv
1540 template<typename _Tp>
1541 struct add_cv
1542 {
1543 typedef typename
1545 };
1546
1547#if __cplusplus > 201103L
1548
1549#define __cpp_lib_transformation_trait_aliases 201304
1550
1551 /// Alias template for remove_const
1552 template<typename _Tp>
1553 using remove_const_t = typename remove_const<_Tp>::type;
1554
1555 /// Alias template for remove_volatile
1556 template<typename _Tp>
1557 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1558
1559 /// Alias template for remove_cv
1560 template<typename _Tp>
1561 using remove_cv_t = typename remove_cv<_Tp>::type;
1562
1563 /// Alias template for add_const
1564 template<typename _Tp>
1565 using add_const_t = typename add_const<_Tp>::type;
1566
1567 /// Alias template for add_volatile
1568 template<typename _Tp>
1569 using add_volatile_t = typename add_volatile<_Tp>::type;
1570
1571 /// Alias template for add_cv
1572 template<typename _Tp>
1573 using add_cv_t = typename add_cv<_Tp>::type;
1574#endif
1575
1576 // Reference transformations.
1577
1578 /// remove_reference
1579 template<typename _Tp>
1581 { typedef _Tp type; };
1582
1583 template<typename _Tp>
1584 struct remove_reference<_Tp&>
1585 { typedef _Tp type; };
1586
1587 template<typename _Tp>
1588 struct remove_reference<_Tp&&>
1589 { typedef _Tp type; };
1590
1591 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1592 struct __add_lvalue_reference_helper
1593 { typedef _Tp type; };
1594
1595 template<typename _Tp>
1596 struct __add_lvalue_reference_helper<_Tp, true>
1597 { typedef _Tp& type; };
1598
1599 /// add_lvalue_reference
1600 template<typename _Tp>
1602 : public __add_lvalue_reference_helper<_Tp>
1603 { };
1604
1605 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1606 struct __add_rvalue_reference_helper
1607 { typedef _Tp type; };
1608
1609 template<typename _Tp>
1610 struct __add_rvalue_reference_helper<_Tp, true>
1611 { typedef _Tp&& type; };
1612
1613 /// add_rvalue_reference
1614 template<typename _Tp>
1616 : public __add_rvalue_reference_helper<_Tp>
1617 { };
1618
1619#if __cplusplus > 201103L
1620 /// Alias template for remove_reference
1621 template<typename _Tp>
1622 using remove_reference_t = typename remove_reference<_Tp>::type;
1623
1624 /// Alias template for add_lvalue_reference
1625 template<typename _Tp>
1626 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1627
1628 /// Alias template for add_rvalue_reference
1629 template<typename _Tp>
1630 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1631#endif
1632
1633 // Sign modifications.
1634
1635 // Utility for constructing identically cv-qualified types.
1636 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1637 struct __cv_selector;
1638
1639 template<typename _Unqualified>
1640 struct __cv_selector<_Unqualified, false, false>
1641 { typedef _Unqualified __type; };
1642
1643 template<typename _Unqualified>
1644 struct __cv_selector<_Unqualified, false, true>
1645 { typedef volatile _Unqualified __type; };
1646
1647 template<typename _Unqualified>
1648 struct __cv_selector<_Unqualified, true, false>
1649 { typedef const _Unqualified __type; };
1650
1651 template<typename _Unqualified>
1652 struct __cv_selector<_Unqualified, true, true>
1653 { typedef const volatile _Unqualified __type; };
1654
1655 template<typename _Qualified, typename _Unqualified,
1656 bool _IsConst = is_const<_Qualified>::value,
1657 bool _IsVol = is_volatile<_Qualified>::value>
1658 class __match_cv_qualifiers
1659 {
1660 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1661
1662 public:
1663 typedef typename __match::__type __type;
1664 };
1665
1666 // Utility for finding the unsigned versions of signed integral types.
1667 template<typename _Tp>
1668 struct __make_unsigned
1669 { typedef _Tp __type; };
1670
1671 template<>
1672 struct __make_unsigned<char>
1673 { typedef unsigned char __type; };
1674
1675 template<>
1676 struct __make_unsigned<signed char>
1677 { typedef unsigned char __type; };
1678
1679 template<>
1680 struct __make_unsigned<short>
1681 { typedef unsigned short __type; };
1682
1683 template<>
1684 struct __make_unsigned<int>
1685 { typedef unsigned int __type; };
1686
1687 template<>
1688 struct __make_unsigned<long>
1689 { typedef unsigned long __type; };
1690
1691 template<>
1692 struct __make_unsigned<long long>
1693 { typedef unsigned long long __type; };
1694
1695#if defined(__GLIBCXX_TYPE_INT_N_0)
1696 template<>
1697 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1698 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1699#endif
1700#if defined(__GLIBCXX_TYPE_INT_N_1)
1701 template<>
1702 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1703 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1704#endif
1705#if defined(__GLIBCXX_TYPE_INT_N_2)
1706 template<>
1707 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1708 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1709#endif
1710#if defined(__GLIBCXX_TYPE_INT_N_3)
1711 template<>
1712 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1713 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1714#endif
1715
1716 // Select between integral and enum: not possible to be both.
1717 template<typename _Tp,
1718 bool _IsInt = is_integral<_Tp>::value,
1719 bool _IsEnum = is_enum<_Tp>::value>
1720 class __make_unsigned_selector;
1721
1722 template<typename _Tp>
1723 class __make_unsigned_selector<_Tp, true, false>
1724 {
1725 using __unsigned_type
1726 = typename __make_unsigned<__remove_cv_t<_Tp>>::__type;
1727
1728 public:
1729 using __type
1730 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1731 };
1732
1733 class __make_unsigned_selector_base
1734 {
1735 protected:
1736 template<typename...> struct _List { };
1737
1738 template<typename _Tp, typename... _Up>
1739 struct _List<_Tp, _Up...> : _List<_Up...>
1740 { static constexpr size_t __size = sizeof(_Tp); };
1741
1742 template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
1743 struct __select;
1744
1745 template<size_t _Sz, typename _Uint, typename... _UInts>
1746 struct __select<_Sz, _List<_Uint, _UInts...>, true>
1747 { using __type = _Uint; };
1748
1749 template<size_t _Sz, typename _Uint, typename... _UInts>
1750 struct __select<_Sz, _List<_Uint, _UInts...>, false>
1751 : __select<_Sz, _List<_UInts...>>
1752 { };
1753 };
1754
1755 // Choose unsigned integer type with the smallest rank and same size as _Tp
1756 template<typename _Tp>
1757 class __make_unsigned_selector<_Tp, false, true>
1758 : __make_unsigned_selector_base
1759 {
1760 // With -fshort-enums, an enum may be as small as a char.
1761 using _UInts = _List<unsigned char, unsigned short, unsigned int,
1762 unsigned long, unsigned long long>;
1763
1764 using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
1765
1766 public:
1767 using __type
1768 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1769 };
1770
1771 // wchar_t, char8_t, char16_t and char32_t are integral types but are
1772 // neither signed integer types nor unsigned integer types, so must be
1773 // transformed to the unsigned integer type with the smallest rank.
1774 // Use the partial specialization for enumeration types to do that.
1775#if defined(_GLIBCXX_USE_WCHAR_T)
1776 template<>
1777 struct __make_unsigned<wchar_t>
1778 {
1779 using __type
1780 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
1781 };
1782#endif
1783
1784#ifdef _GLIBCXX_USE_CHAR8_T
1785 template<>
1786 struct __make_unsigned<char8_t>
1787 {
1788 using __type
1789 = typename __make_unsigned_selector<char8_t, false, true>::__type;
1790 };
1791#endif
1792
1793 template<>
1794 struct __make_unsigned<char16_t>
1795 {
1796 using __type
1797 = typename __make_unsigned_selector<char16_t, false, true>::__type;
1798 };
1799
1800 template<>
1801 struct __make_unsigned<char32_t>
1802 {
1803 using __type
1804 = typename __make_unsigned_selector<char32_t, false, true>::__type;
1805 };
1806
1807 // Given an integral/enum type, return the corresponding unsigned
1808 // integer type.
1809 // Primary template.
1810 /// make_unsigned
1811 template<typename _Tp>
1813 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1814
1815 // Integral, but don't define.
1816 template<>
1817 struct make_unsigned<bool>;
1818
1819
1820 // Utility for finding the signed versions of unsigned integral types.
1821 template<typename _Tp>
1822 struct __make_signed
1823 { typedef _Tp __type; };
1824
1825 template<>
1826 struct __make_signed<char>
1827 { typedef signed char __type; };
1828
1829 template<>
1830 struct __make_signed<unsigned char>
1831 { typedef signed char __type; };
1832
1833 template<>
1834 struct __make_signed<unsigned short>
1835 { typedef signed short __type; };
1836
1837 template<>
1838 struct __make_signed<unsigned int>
1839 { typedef signed int __type; };
1840
1841 template<>
1842 struct __make_signed<unsigned long>
1843 { typedef signed long __type; };
1844
1845 template<>
1846 struct __make_signed<unsigned long long>
1847 { typedef signed long long __type; };
1848
1849#if defined(__GLIBCXX_TYPE_INT_N_0)
1850 template<>
1851 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1852 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1853#endif
1854#if defined(__GLIBCXX_TYPE_INT_N_1)
1855 template<>
1856 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1857 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1858#endif
1859#if defined(__GLIBCXX_TYPE_INT_N_2)
1860 template<>
1861 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1862 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1863#endif
1864#if defined(__GLIBCXX_TYPE_INT_N_3)
1865 template<>
1866 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1867 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1868#endif
1869
1870 // Select between integral and enum: not possible to be both.
1871 template<typename _Tp,
1872 bool _IsInt = is_integral<_Tp>::value,
1873 bool _IsEnum = is_enum<_Tp>::value>
1874 class __make_signed_selector;
1875
1876 template<typename _Tp>
1877 class __make_signed_selector<_Tp, true, false>
1878 {
1879 using __signed_type
1880 = typename __make_signed<__remove_cv_t<_Tp>>::__type;
1881
1882 public:
1883 using __type
1884 = typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
1885 };
1886
1887 // Choose signed integer type with the smallest rank and same size as _Tp
1888 template<typename _Tp>
1889 class __make_signed_selector<_Tp, false, true>
1890 {
1891 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1892
1893 public:
1894 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1895 };
1896
1897 // wchar_t, char16_t and char32_t are integral types but are neither
1898 // signed integer types nor unsigned integer types, so must be
1899 // transformed to the signed integer type with the smallest rank.
1900 // Use the partial specialization for enumeration types to do that.
1901#if defined(_GLIBCXX_USE_WCHAR_T)
1902 template<>
1903 struct __make_signed<wchar_t>
1904 {
1905 using __type
1906 = typename __make_signed_selector<wchar_t, false, true>::__type;
1907 };
1908#endif
1909
1910#if defined(_GLIBCXX_USE_CHAR8_T)
1911 template<>
1912 struct __make_signed<char8_t>
1913 {
1914 using __type
1915 = typename __make_signed_selector<char8_t, false, true>::__type;
1916 };
1917#endif
1918
1919 template<>
1920 struct __make_signed<char16_t>
1921 {
1922 using __type
1923 = typename __make_signed_selector<char16_t, false, true>::__type;
1924 };
1925
1926 template<>
1927 struct __make_signed<char32_t>
1928 {
1929 using __type
1930 = typename __make_signed_selector<char32_t, false, true>::__type;
1931 };
1932
1933 // Given an integral/enum type, return the corresponding signed
1934 // integer type.
1935 // Primary template.
1936 /// make_signed
1937 template<typename _Tp>
1939 { typedef typename __make_signed_selector<_Tp>::__type type; };
1940
1941 // Integral, but don't define.
1942 template<>
1943 struct make_signed<bool>;
1944
1945#if __cplusplus > 201103L
1946 /// Alias template for make_signed
1947 template<typename _Tp>
1948 using make_signed_t = typename make_signed<_Tp>::type;
1949
1950 /// Alias template for make_unsigned
1951 template<typename _Tp>
1952 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1953#endif
1954
1955 // Array modifications.
1956
1957 /// remove_extent
1958 template<typename _Tp>
1960 { typedef _Tp type; };
1961
1962 template<typename _Tp, std::size_t _Size>
1963 struct remove_extent<_Tp[_Size]>
1964 { typedef _Tp type; };
1965
1966 template<typename _Tp>
1967 struct remove_extent<_Tp[]>
1968 { typedef _Tp type; };
1969
1970 /// remove_all_extents
1971 template<typename _Tp>
1973 { typedef _Tp type; };
1974
1975 template<typename _Tp, std::size_t _Size>
1976 struct remove_all_extents<_Tp[_Size]>
1977 { typedef typename remove_all_extents<_Tp>::type type; };
1978
1979 template<typename _Tp>
1980 struct remove_all_extents<_Tp[]>
1981 { typedef typename remove_all_extents<_Tp>::type type; };
1982
1983#if __cplusplus > 201103L
1984 /// Alias template for remove_extent
1985 template<typename _Tp>
1986 using remove_extent_t = typename remove_extent<_Tp>::type;
1987
1988 /// Alias template for remove_all_extents
1989 template<typename _Tp>
1990 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1991#endif
1992
1993 // Pointer modifications.
1994
1995 template<typename _Tp, typename>
1996 struct __remove_pointer_helper
1997 { typedef _Tp type; };
1998
1999 template<typename _Tp, typename _Up>
2000 struct __remove_pointer_helper<_Tp, _Up*>
2001 { typedef _Up type; };
2002
2003 /// remove_pointer
2004 template<typename _Tp>
2006 : public __remove_pointer_helper<_Tp, __remove_cv_t<_Tp>>
2007 { };
2008
2009 /// add_pointer
2010 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
2011 is_void<_Tp>>::value>
2013 { typedef _Tp type; };
2014
2015 template<typename _Tp>
2016 struct __add_pointer_helper<_Tp, true>
2017 { typedef typename remove_reference<_Tp>::type* type; };
2018
2019 template<typename _Tp>
2020 struct add_pointer
2021 : public __add_pointer_helper<_Tp>
2022 { };
2023
2024#if __cplusplus > 201103L
2025 /// Alias template for remove_pointer
2026 template<typename _Tp>
2027 using remove_pointer_t = typename remove_pointer<_Tp>::type;
2028
2029 /// Alias template for add_pointer
2030 template<typename _Tp>
2031 using add_pointer_t = typename add_pointer<_Tp>::type;
2032#endif
2033
2034 template<std::size_t _Len>
2035 struct __aligned_storage_msa
2036 {
2037 union __type
2038 {
2039 unsigned char __data[_Len];
2040 struct __attribute__((__aligned__)) { } __align;
2041 };
2042 };
2043
2044 /**
2045 * @brief Alignment type.
2046 *
2047 * The value of _Align is a default-alignment which shall be the
2048 * most stringent alignment requirement for any C++ object type
2049 * whose size is no greater than _Len (3.9). The member typedef
2050 * type shall be a POD type suitable for use as uninitialized
2051 * storage for any object whose size is at most _Len and whose
2052 * alignment is a divisor of _Align.
2053 */
2054 template<std::size_t _Len, std::size_t _Align =
2055 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2057 {
2058 union type
2059 {
2060 unsigned char __data[_Len];
2061 struct __attribute__((__aligned__((_Align)))) { } __align;
2062 };
2063 };
2064
2065 template <typename... _Types>
2066 struct __strictest_alignment
2067 {
2068 static const size_t _S_alignment = 0;
2069 static const size_t _S_size = 0;
2070 };
2071
2072 template <typename _Tp, typename... _Types>
2073 struct __strictest_alignment<_Tp, _Types...>
2074 {
2075 static const size_t _S_alignment =
2076 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
2077 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
2078 static const size_t _S_size =
2079 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
2080 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
2081 };
2082
2083 /**
2084 * @brief Provide aligned storage for types.
2085 *
2086 * [meta.trans.other]
2087 *
2088 * Provides aligned storage for any of the provided types of at
2089 * least size _Len.
2090 *
2091 * @see aligned_storage
2092 */
2093 template <size_t _Len, typename... _Types>
2095 {
2096 private:
2097 static_assert(sizeof...(_Types) != 0, "At least one type is required");
2098
2099 using __strictest = __strictest_alignment<_Types...>;
2100 static const size_t _S_len = _Len > __strictest::_S_size
2101 ? _Len : __strictest::_S_size;
2102 public:
2103 /// The value of the strictest alignment of _Types.
2104 static const size_t alignment_value = __strictest::_S_alignment;
2105 /// The storage.
2107 };
2108
2109 template <size_t _Len, typename... _Types>
2110 const size_t aligned_union<_Len, _Types...>::alignment_value;
2111
2112 // Decay trait for arrays and functions, used for perfect forwarding
2113 // in make_pair, make_tuple, etc.
2114 template<typename _Up,
2115 bool _IsArray = is_array<_Up>::value,
2116 bool _IsFunction = is_function<_Up>::value>
2117 struct __decay_selector;
2118
2119 // NB: DR 705.
2120 template<typename _Up>
2121 struct __decay_selector<_Up, false, false>
2122 { typedef __remove_cv_t<_Up> __type; };
2123
2124 template<typename _Up>
2125 struct __decay_selector<_Up, true, false>
2126 { typedef typename remove_extent<_Up>::type* __type; };
2127
2128 template<typename _Up>
2129 struct __decay_selector<_Up, false, true>
2130 { typedef typename add_pointer<_Up>::type __type; };
2131
2132 /// decay
2133 template<typename _Tp>
2134 class decay
2135 {
2136 typedef typename remove_reference<_Tp>::type __remove_type;
2137
2138 public:
2139 typedef typename __decay_selector<__remove_type>::__type type;
2140 };
2141
2142 // __decay_t (std::decay_t for C++11).
2143 template<typename _Tp>
2144 using __decay_t = typename decay<_Tp>::type;
2145
2146 template<typename _Tp>
2147 class reference_wrapper;
2148
2149 // Helper which adds a reference to a type when given a reference_wrapper
2150 template<typename _Tp>
2151 struct __strip_reference_wrapper
2152 {
2153 typedef _Tp __type;
2154 };
2155
2156 template<typename _Tp>
2157 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
2158 {
2159 typedef _Tp& __type;
2160 };
2161
2162 template<typename _Tp>
2163 using __decay_and_strip = __strip_reference_wrapper<__decay_t<_Tp>>;
2164
2165
2166 // Primary template.
2167 /// Define a member typedef @c type only if a boolean constant is true.
2168 template<bool, typename _Tp = void>
2170 { };
2171
2172 // Partial specialization for true.
2173 template<typename _Tp>
2174 struct enable_if<true, _Tp>
2175 { typedef _Tp type; };
2176
2177 // __enable_if_t (std::enable_if_t for C++11)
2178 template<bool _Cond, typename _Tp = void>
2179 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2180
2181 template<typename... _Cond>
2182 using _Require = __enable_if_t<__and_<_Cond...>::value>;
2183
2184 // Primary template.
2185 /// Define a member typedef @c type to one of two argument types.
2186 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2188 { typedef _Iftrue type; };
2189
2190 // Partial specialization for false.
2191 template<typename _Iftrue, typename _Iffalse>
2192 struct conditional<false, _Iftrue, _Iffalse>
2193 { typedef _Iffalse type; };
2194
2195 // __remove_cvref_t (std::remove_cvref_t for C++11).
2196 template<typename _Tp>
2197 using __remove_cvref_t
2198 = typename remove_cv<typename remove_reference<_Tp>::type>::type;
2199
2200 /// common_type
2201 template<typename... _Tp>
2203
2204 // Sfinae-friendly common_type implementation:
2205
2206 struct __do_common_type_impl
2207 {
2208 template<typename _Tp, typename _Up>
2209 using __cond_t
2210 = decltype(true ? std::declval<_Tp>() : std::declval<_Up>());
2211
2212 // if decay_t<decltype(false ? declval<D1>() : declval<D2>())>
2213 // denotes a valid type, let C denote that type.
2214 template<typename _Tp, typename _Up>
2215 static __success_type<__decay_t<__cond_t<_Tp, _Up>>>
2216 _S_test(int);
2217
2218#if __cplusplus > 201703L
2219 // Otherwise, if COND-RES(CREF(D1), CREF(D2)) denotes a type,
2220 // let C denote the type decay_t<COND-RES(CREF(D1), CREF(D2))>.
2221 template<typename _Tp, typename _Up>
2222 static __success_type<__remove_cvref_t<__cond_t<const _Tp&, const _Up&>>>
2223 _S_test_2(int);
2224#endif
2225
2226 template<typename, typename>
2227 static __failure_type
2228 _S_test_2(...);
2229
2230 template<typename _Tp, typename _Up>
2231 static decltype(_S_test_2<_Tp, _Up>(0))
2232 _S_test(...);
2233 };
2234
2235 // If sizeof...(T) is zero, there shall be no member type.
2236 template<>
2237 struct common_type<>
2238 { };
2239
2240 // If sizeof...(T) is one, the same type, if any, as common_type_t<T0, T0>.
2241 template<typename _Tp0>
2242 struct common_type<_Tp0>
2243 : public common_type<_Tp0, _Tp0>
2244 { };
2245
2246 // If sizeof...(T) is two, ...
2247 template<typename _Tp1, typename _Tp2,
2248 typename _Dp1 = __decay_t<_Tp1>, typename _Dp2 = __decay_t<_Tp2>>
2249 struct __common_type_impl
2250 {
2251 // If is_same_v<T1, D1> is false or is_same_v<T2, D2> is false,
2252 // let C denote the same type, if any, as common_type_t<D1, D2>.
2253 using type = common_type<_Dp1, _Dp2>;
2254 };
2255
2256 template<typename _Tp1, typename _Tp2>
2257 struct __common_type_impl<_Tp1, _Tp2, _Tp1, _Tp2>
2258 : private __do_common_type_impl
2259 {
2260 // Otherwise, if decay_t<decltype(false ? declval<D1>() : declval<D2>())>
2261 // denotes a valid type, let C denote that type.
2262 using type = decltype(_S_test<_Tp1, _Tp2>(0));
2263 };
2264
2265 // If sizeof...(T) is two, ...
2266 template<typename _Tp1, typename _Tp2>
2267 struct common_type<_Tp1, _Tp2>
2268 : public __common_type_impl<_Tp1, _Tp2>::type
2269 { };
2270
2271 template<typename...>
2272 struct __common_type_pack
2273 { };
2274
2275 template<typename, typename, typename = void>
2276 struct __common_type_fold;
2277
2278 // If sizeof...(T) is greater than two, ...
2279 template<typename _Tp1, typename _Tp2, typename... _Rp>
2280 struct common_type<_Tp1, _Tp2, _Rp...>
2281 : public __common_type_fold<common_type<_Tp1, _Tp2>,
2282 __common_type_pack<_Rp...>>
2283 { };
2284
2285 // Let C denote the same type, if any, as common_type_t<T1, T2>.
2286 // If there is such a type C, type shall denote the same type, if any,
2287 // as common_type_t<C, R...>.
2288 template<typename _CTp, typename... _Rp>
2289 struct __common_type_fold<_CTp, __common_type_pack<_Rp...>,
2290 __void_t<typename _CTp::type>>
2291 : public common_type<typename _CTp::type, _Rp...>
2292 { };
2293
2294 // Otherwise, there shall be no member type.
2295 template<typename _CTp, typename _Rp>
2296 struct __common_type_fold<_CTp, _Rp, void>
2297 { };
2298
2299 template<typename _Tp, bool = is_enum<_Tp>::value>
2300 struct __underlying_type_impl
2301 {
2302 using type = __underlying_type(_Tp);
2303 };
2304
2305 template<typename _Tp>
2306 struct __underlying_type_impl<_Tp, false>
2307 { };
2308
2309 /// The underlying type of an enum.
2310 template<typename _Tp>
2312 : public __underlying_type_impl<_Tp>
2313 { };
2314
2315 template<typename _Tp>
2316 struct __declval_protector
2317 {
2318 static const bool __stop = false;
2319 };
2320
2321 template<typename _Tp>
2322 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2323 {
2324 static_assert(__declval_protector<_Tp>::__stop,
2325 "declval() must not be used!");
2326 return __declval<_Tp>(0);
2327 }
2328
2329 /// result_of
2330 template<typename _Signature>
2332
2333 // Sfinae-friendly result_of implementation:
2334
2335#define __cpp_lib_result_of_sfinae 201210
2336
2337 struct __invoke_memfun_ref { };
2338 struct __invoke_memfun_deref { };
2339 struct __invoke_memobj_ref { };
2340 struct __invoke_memobj_deref { };
2341 struct __invoke_other { };
2342
2343 // Associate a tag type with a specialization of __success_type.
2344 template<typename _Tp, typename _Tag>
2345 struct __result_of_success : __success_type<_Tp>
2346 { using __invoke_type = _Tag; };
2347
2348 // [func.require] paragraph 1 bullet 1:
2349 struct __result_of_memfun_ref_impl
2350 {
2351 template<typename _Fp, typename _Tp1, typename... _Args>
2352 static __result_of_success<decltype(
2353 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2354 ), __invoke_memfun_ref> _S_test(int);
2355
2356 template<typename...>
2357 static __failure_type _S_test(...);
2358 };
2359
2360 template<typename _MemPtr, typename _Arg, typename... _Args>
2361 struct __result_of_memfun_ref
2362 : private __result_of_memfun_ref_impl
2363 {
2364 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2365 };
2366
2367 // [func.require] paragraph 1 bullet 2:
2368 struct __result_of_memfun_deref_impl
2369 {
2370 template<typename _Fp, typename _Tp1, typename... _Args>
2371 static __result_of_success<decltype(
2372 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2373 ), __invoke_memfun_deref> _S_test(int);
2374
2375 template<typename...>
2376 static __failure_type _S_test(...);
2377 };
2378
2379 template<typename _MemPtr, typename _Arg, typename... _Args>
2380 struct __result_of_memfun_deref
2381 : private __result_of_memfun_deref_impl
2382 {
2383 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2384 };
2385
2386 // [func.require] paragraph 1 bullet 3:
2387 struct __result_of_memobj_ref_impl
2388 {
2389 template<typename _Fp, typename _Tp1>
2390 static __result_of_success<decltype(
2391 std::declval<_Tp1>().*std::declval<_Fp>()
2392 ), __invoke_memobj_ref> _S_test(int);
2393
2394 template<typename, typename>
2395 static __failure_type _S_test(...);
2396 };
2397
2398 template<typename _MemPtr, typename _Arg>
2399 struct __result_of_memobj_ref
2400 : private __result_of_memobj_ref_impl
2401 {
2402 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2403 };
2404
2405 // [func.require] paragraph 1 bullet 4:
2406 struct __result_of_memobj_deref_impl
2407 {
2408 template<typename _Fp, typename _Tp1>
2409 static __result_of_success<decltype(
2410 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2411 ), __invoke_memobj_deref> _S_test(int);
2412
2413 template<typename, typename>
2414 static __failure_type _S_test(...);
2415 };
2416
2417 template<typename _MemPtr, typename _Arg>
2418 struct __result_of_memobj_deref
2419 : private __result_of_memobj_deref_impl
2420 {
2421 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2422 };
2423
2424 template<typename _MemPtr, typename _Arg>
2425 struct __result_of_memobj;
2426
2427 template<typename _Res, typename _Class, typename _Arg>
2428 struct __result_of_memobj<_Res _Class::*, _Arg>
2429 {
2430 typedef __remove_cvref_t<_Arg> _Argval;
2431 typedef _Res _Class::* _MemPtr;
2432 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2433 is_base_of<_Class, _Argval>>::value,
2434 __result_of_memobj_ref<_MemPtr, _Arg>,
2435 __result_of_memobj_deref<_MemPtr, _Arg>
2436 >::type::type type;
2437 };
2438
2439 template<typename _MemPtr, typename _Arg, typename... _Args>
2440 struct __result_of_memfun;
2441
2442 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2443 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2444 {
2445 typedef typename remove_reference<_Arg>::type _Argval;
2446 typedef _Res _Class::* _MemPtr;
2447 typedef typename conditional<is_base_of<_Class, _Argval>::value,
2448 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2449 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2450 >::type::type type;
2451 };
2452
2453 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2454 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2455 // as the object expression
2456
2457 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2458 template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
2459 struct __inv_unwrap
2460 {
2461 using type = _Tp;
2462 };
2463
2464 template<typename _Tp, typename _Up>
2465 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2466 {
2467 using type = _Up&;
2468 };
2469
2470 template<bool, bool, typename _Functor, typename... _ArgTypes>
2471 struct __result_of_impl
2472 {
2473 typedef __failure_type type;
2474 };
2475
2476 template<typename _MemPtr, typename _Arg>
2477 struct __result_of_impl<true, false, _MemPtr, _Arg>
2478 : public __result_of_memobj<__decay_t<_MemPtr>,
2479 typename __inv_unwrap<_Arg>::type>
2480 { };
2481
2482 template<typename _MemPtr, typename _Arg, typename... _Args>
2483 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2484 : public __result_of_memfun<__decay_t<_MemPtr>,
2485 typename __inv_unwrap<_Arg>::type, _Args...>
2486 { };
2487
2488 // [func.require] paragraph 1 bullet 5:
2489 struct __result_of_other_impl
2490 {
2491 template<typename _Fn, typename... _Args>
2492 static __result_of_success<decltype(
2493 std::declval<_Fn>()(std::declval<_Args>()...)
2494 ), __invoke_other> _S_test(int);
2495
2496 template<typename...>
2497 static __failure_type _S_test(...);
2498 };
2499
2500 template<typename _Functor, typename... _ArgTypes>
2501 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2502 : private __result_of_other_impl
2503 {
2504 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2505 };
2506
2507 // __invoke_result (std::invoke_result for C++11)
2508 template<typename _Functor, typename... _ArgTypes>
2509 struct __invoke_result
2510 : public __result_of_impl<
2511 is_member_object_pointer<
2512 typename remove_reference<_Functor>::type
2513 >::value,
2514 is_member_function_pointer<
2515 typename remove_reference<_Functor>::type
2516 >::value,
2517 _Functor, _ArgTypes...
2518 >::type
2519 { };
2520
2521 template<typename _Functor, typename... _ArgTypes>
2522 struct result_of<_Functor(_ArgTypes...)>
2523 : public __invoke_result<_Functor, _ArgTypes...>
2524 { };
2525
2526#if __cplusplus >= 201402L
2527 /// Alias template for aligned_storage
2528 template<size_t _Len, size_t _Align =
2529 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2531
2532 template <size_t _Len, typename... _Types>
2533 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2534
2535 /// Alias template for decay
2536 template<typename _Tp>
2537 using decay_t = typename decay<_Tp>::type;
2538
2539 /// Alias template for enable_if
2540 template<bool _Cond, typename _Tp = void>
2542
2543 /// Alias template for conditional
2544 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2545 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2546
2547 /// Alias template for common_type
2548 template<typename... _Tp>
2549 using common_type_t = typename common_type<_Tp...>::type;
2550
2551 /// Alias template for underlying_type
2552 template<typename _Tp>
2553 using underlying_type_t = typename underlying_type<_Tp>::type;
2554
2555 /// Alias template for result_of
2556 template<typename _Tp>
2558#endif // C++14
2559
2560#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2561#define __cpp_lib_void_t 201411
2562 /// A metafunction that always yields void, used for detecting valid types.
2563 template<typename...> using void_t = void;
2564#endif
2565
2566 /// Implementation of the detection idiom (negative case).
2567 template<typename _Default, typename _AlwaysVoid,
2568 template<typename...> class _Op, typename... _Args>
2570 {
2571 using value_t = false_type;
2572 using type = _Default;
2573 };
2574
2575 /// Implementation of the detection idiom (positive case).
2576 template<typename _Default, template<typename...> class _Op,
2577 typename... _Args>
2578 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2579 {
2580 using value_t = true_type;
2581 using type = _Op<_Args...>;
2582 };
2583
2584 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2585 template<typename _Default, template<typename...> class _Op,
2586 typename... _Args>
2587 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2588
2589 // _Op<_Args...> if that is a valid type, otherwise _Default.
2590 template<typename _Default, template<typename...> class _Op,
2591 typename... _Args>
2592 using __detected_or_t
2593 = typename __detected_or<_Default, _Op, _Args...>::type;
2594
2595 /// @} group metaprogramming
2596
2597 /**
2598 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2599 * member type _NTYPE.
2600 */
2601#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2602 template<typename _Tp, typename = __void_t<>> \
2603 struct __has_##_NTYPE \
2604 : false_type \
2605 { }; \
2606 template<typename _Tp> \
2607 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2608 : true_type \
2609 { };
2610
2611 template <typename _Tp>
2612 struct __is_swappable;
2613
2614 template <typename _Tp>
2615 struct __is_nothrow_swappable;
2616
2617 template<typename... _Elements>
2618 class tuple;
2619
2620 template<typename>
2621 struct __is_tuple_like_impl : false_type
2622 { };
2623
2624 template<typename... _Tps>
2625 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2626 { };
2627
2628 // Internal type trait that allows us to sfinae-protect tuple_cat.
2629 template<typename _Tp>
2630 struct __is_tuple_like
2631 : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
2632 { };
2633
2634 template<typename _Tp>
2635 _GLIBCXX20_CONSTEXPR
2636 inline
2637 _Require<__not_<__is_tuple_like<_Tp>>,
2638 is_move_constructible<_Tp>,
2639 is_move_assignable<_Tp>>
2640 swap(_Tp&, _Tp&)
2641 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2642 is_nothrow_move_assignable<_Tp>>::value);
2643
2644 template<typename _Tp, size_t _Nm>
2645 _GLIBCXX20_CONSTEXPR
2646 inline
2647 __enable_if_t<__is_swappable<_Tp>::value>
2648 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2649 noexcept(__is_nothrow_swappable<_Tp>::value);
2650
2651 namespace __swappable_details {
2652 using std::swap;
2653
2654 struct __do_is_swappable_impl
2655 {
2656 template<typename _Tp, typename
2657 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2658 static true_type __test(int);
2659
2660 template<typename>
2661 static false_type __test(...);
2662 };
2663
2664 struct __do_is_nothrow_swappable_impl
2665 {
2666 template<typename _Tp>
2667 static __bool_constant<
2668 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2669 > __test(int);
2670
2671 template<typename>
2672 static false_type __test(...);
2673 };
2674
2675 } // namespace __swappable_details
2676
2677 template<typename _Tp>
2678 struct __is_swappable_impl
2679 : public __swappable_details::__do_is_swappable_impl
2680 {
2681 typedef decltype(__test<_Tp>(0)) type;
2682 };
2683
2684 template<typename _Tp>
2685 struct __is_nothrow_swappable_impl
2686 : public __swappable_details::__do_is_nothrow_swappable_impl
2687 {
2688 typedef decltype(__test<_Tp>(0)) type;
2689 };
2690
2691 template<typename _Tp>
2692 struct __is_swappable
2693 : public __is_swappable_impl<_Tp>::type
2694 { };
2695
2696 template<typename _Tp>
2697 struct __is_nothrow_swappable
2698 : public __is_nothrow_swappable_impl<_Tp>::type
2699 { };
2700
2701#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2702#define __cpp_lib_is_swappable 201603
2703 /// Metafunctions used for detecting swappable types: p0185r1
2704
2705 /// is_swappable
2706 template<typename _Tp>
2708 : public __is_swappable_impl<_Tp>::type
2709 {
2710 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
2711 "template argument must be a complete class or an unbounded array");
2712 };
2713
2714 /// is_nothrow_swappable
2715 template<typename _Tp>
2717 : public __is_nothrow_swappable_impl<_Tp>::type
2718 {
2719 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
2720 "template argument must be a complete class or an unbounded array");
2721 };
2722
2723#if __cplusplus >= 201402L
2724 /// is_swappable_v
2725 template<typename _Tp>
2726 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2728
2729 /// is_nothrow_swappable_v
2730 template<typename _Tp>
2731 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2733#endif // __cplusplus >= 201402L
2734
2735 namespace __swappable_with_details {
2736 using std::swap;
2737
2738 struct __do_is_swappable_with_impl
2739 {
2740 template<typename _Tp, typename _Up, typename
2741 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2742 typename
2743 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2744 static true_type __test(int);
2745
2746 template<typename, typename>
2747 static false_type __test(...);
2748 };
2749
2750 struct __do_is_nothrow_swappable_with_impl
2751 {
2752 template<typename _Tp, typename _Up>
2753 static __bool_constant<
2754 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2755 &&
2756 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2757 > __test(int);
2758
2759 template<typename, typename>
2760 static false_type __test(...);
2761 };
2762
2763 } // namespace __swappable_with_details
2764
2765 template<typename _Tp, typename _Up>
2766 struct __is_swappable_with_impl
2767 : public __swappable_with_details::__do_is_swappable_with_impl
2768 {
2769 typedef decltype(__test<_Tp, _Up>(0)) type;
2770 };
2771
2772 // Optimization for the homogenous lvalue case, not required:
2773 template<typename _Tp>
2774 struct __is_swappable_with_impl<_Tp&, _Tp&>
2775 : public __swappable_details::__do_is_swappable_impl
2776 {
2777 typedef decltype(__test<_Tp&>(0)) type;
2778 };
2779
2780 template<typename _Tp, typename _Up>
2781 struct __is_nothrow_swappable_with_impl
2782 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2783 {
2784 typedef decltype(__test<_Tp, _Up>(0)) type;
2785 };
2786
2787 // Optimization for the homogenous lvalue case, not required:
2788 template<typename _Tp>
2789 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2790 : public __swappable_details::__do_is_nothrow_swappable_impl
2791 {
2792 typedef decltype(__test<_Tp&>(0)) type;
2793 };
2794
2795 /// is_swappable_with
2796 template<typename _Tp, typename _Up>
2798 : public __is_swappable_with_impl<_Tp, _Up>::type
2799 { };
2800
2801 /// is_nothrow_swappable_with
2802 template<typename _Tp, typename _Up>
2804 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2805 { };
2806
2807#if __cplusplus >= 201402L
2808 /// is_swappable_with_v
2809 template<typename _Tp, typename _Up>
2810 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2812
2813 /// is_nothrow_swappable_with_v
2814 template<typename _Tp, typename _Up>
2815 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2817#endif // __cplusplus >= 201402L
2818
2819#endif// c++1z or gnu++11
2820
2821 // __is_invocable (std::is_invocable for C++11)
2822
2823 // The primary template is used for invalid INVOKE expressions.
2824 template<typename _Result, typename _Ret,
2825 bool = is_void<_Ret>::value, typename = void>
2826 struct __is_invocable_impl : false_type { };
2827
2828 // Used for valid INVOKE and INVOKE<void> expressions.
2829 template<typename _Result, typename _Ret>
2830 struct __is_invocable_impl<_Result, _Ret,
2831 /* is_void<_Ret> = */ true,
2832 __void_t<typename _Result::type>>
2833 : true_type
2834 { };
2835
2836#pragma GCC diagnostic push
2837#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
2838 // Used for INVOKE<R> expressions to check the implicit conversion to R.
2839 template<typename _Result, typename _Ret>
2840 struct __is_invocable_impl<_Result, _Ret,
2841 /* is_void<_Ret> = */ false,
2842 __void_t<typename _Result::type>>
2843 {
2844 private:
2845 // The type of the INVOKE expression.
2846 // Unlike declval, this doesn't add_rvalue_reference.
2847 static typename _Result::type _S_get();
2848
2849 template<typename _Tp>
2850 static void _S_conv(_Tp);
2851
2852 // This overload is viable if INVOKE(f, args...) can convert to _Tp.
2853 template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))>
2854 static true_type
2855 _S_test(int);
2856
2857 template<typename _Tp>
2858 static false_type
2859 _S_test(...);
2860
2861 public:
2862 using type = decltype(_S_test<_Ret>(1));
2863 };
2864#pragma GCC diagnostic pop
2865
2866 template<typename _Fn, typename... _ArgTypes>
2867 struct __is_invocable
2868 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2869 { };
2870
2871 template<typename _Fn, typename _Tp, typename... _Args>
2872 constexpr bool __call_is_nt(__invoke_memfun_ref)
2873 {
2874 using _Up = typename __inv_unwrap<_Tp>::type;
2875 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2876 std::declval<_Args>()...));
2877 }
2878
2879 template<typename _Fn, typename _Tp, typename... _Args>
2880 constexpr bool __call_is_nt(__invoke_memfun_deref)
2881 {
2882 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2883 std::declval<_Args>()...));
2884 }
2885
2886 template<typename _Fn, typename _Tp>
2887 constexpr bool __call_is_nt(__invoke_memobj_ref)
2888 {
2889 using _Up = typename __inv_unwrap<_Tp>::type;
2890 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2891 }
2892
2893 template<typename _Fn, typename _Tp>
2894 constexpr bool __call_is_nt(__invoke_memobj_deref)
2895 {
2896 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2897 }
2898
2899 template<typename _Fn, typename... _Args>
2900 constexpr bool __call_is_nt(__invoke_other)
2901 {
2902 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2903 }
2904
2905 template<typename _Result, typename _Fn, typename... _Args>
2906 struct __call_is_nothrow
2907 : __bool_constant<
2908 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2909 >
2910 { };
2911
2912 template<typename _Fn, typename... _Args>
2913 using __call_is_nothrow_
2914 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2915
2916 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2917 template<typename _Fn, typename... _Args>
2918 struct __is_nothrow_invocable
2919 : __and_<__is_invocable<_Fn, _Args...>,
2920 __call_is_nothrow_<_Fn, _Args...>>::type
2921 { };
2922
2923#pragma GCC diagnostic push
2924#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
2925 struct __nonesuchbase {};
2926 struct __nonesuch : private __nonesuchbase {
2927 ~__nonesuch() = delete;
2928 __nonesuch(__nonesuch const&) = delete;
2929 void operator=(__nonesuch const&) = delete;
2930 };
2931#pragma GCC diagnostic pop
2932
2933#if __cplusplus >= 201703L
2934# define __cpp_lib_is_invocable 201703
2935
2936 /// std::invoke_result
2937 template<typename _Functor, typename... _ArgTypes>
2938 struct invoke_result
2939 : public __invoke_result<_Functor, _ArgTypes...>
2940 { };
2941
2942 /// std::invoke_result_t
2943 template<typename _Fn, typename... _Args>
2944 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2945
2946 /// std::is_invocable
2947 template<typename _Fn, typename... _ArgTypes>
2948 struct is_invocable
2949 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2950 {
2951 static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
2952 "_Fn must be a complete class or an unbounded array");
2953 };
2954
2955 /// std::is_invocable_r
2956 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2957 struct is_invocable_r
2958 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2959 {
2960 static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
2961 "_Fn must be a complete class or an unbounded array");
2962 };
2963
2964 /// std::is_nothrow_invocable
2965 template<typename _Fn, typename... _ArgTypes>
2966 struct is_nothrow_invocable
2967 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2968 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2969 {
2970 static_assert(std::__is_complete_or_unbounded(__type_identity<_Fn>{}),
2971 "_Fn must be a complete class or an unbounded array");
2972 };
2973
2974 template<typename _Result, typename _Ret, typename = void>
2975 struct __is_nt_invocable_impl : false_type { };
2976
2977 template<typename _Result, typename _Ret>
2978 struct __is_nt_invocable_impl<_Result, _Ret,
2979 __void_t<typename _Result::type>>
2980 : __or_<is_void<_Ret>,
2981 __is_nothrow_convertible<typename _Result::type, _Ret>>
2982 { };
2983
2984 /// std::is_nothrow_invocable_r
2985 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2986 struct is_nothrow_invocable_r
2987 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2988 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2989 { };
2990
2991 /// std::is_invocable_v
2992 template<typename _Fn, typename... _Args>
2993 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2994
2995 /// std::is_nothrow_invocable_v
2996 template<typename _Fn, typename... _Args>
2997 inline constexpr bool is_nothrow_invocable_v
2998 = is_nothrow_invocable<_Fn, _Args...>::value;
2999
3000 /// std::is_invocable_r_v
3001 template<typename _Ret, typename _Fn, typename... _Args>
3002 inline constexpr bool is_invocable_r_v
3003 = is_invocable_r<_Ret, _Fn, _Args...>::value;
3004
3005 /// std::is_nothrow_invocable_r_v
3006 template<typename _Ret, typename _Fn, typename... _Args>
3007 inline constexpr bool is_nothrow_invocable_r_v
3008 = is_nothrow_invocable_r<_Ret, _Fn, _Args...>::value;
3009#endif // C++17
3010
3011#if __cplusplus >= 201703L
3012# define __cpp_lib_type_trait_variable_templates 201510L
3013template <typename _Tp>
3014 inline constexpr bool is_void_v = is_void<_Tp>::value;
3015template <typename _Tp>
3016 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
3017template <typename _Tp>
3018 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
3019template <typename _Tp>
3020 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
3021template <typename _Tp>
3022 inline constexpr bool is_array_v = is_array<_Tp>::value;
3023template <typename _Tp>
3024 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
3025template <typename _Tp>
3026 inline constexpr bool is_lvalue_reference_v =
3027 is_lvalue_reference<_Tp>::value;
3028template <typename _Tp>
3029 inline constexpr bool is_rvalue_reference_v =
3030 is_rvalue_reference<_Tp>::value;
3031template <typename _Tp>
3032 inline constexpr bool is_member_object_pointer_v =
3033 is_member_object_pointer<_Tp>::value;
3034template <typename _Tp>
3035 inline constexpr bool is_member_function_pointer_v =
3036 is_member_function_pointer<_Tp>::value;
3037template <typename _Tp>
3038 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
3039template <typename _Tp>
3040 inline constexpr bool is_union_v = is_union<_Tp>::value;
3041template <typename _Tp>
3042 inline constexpr bool is_class_v = is_class<_Tp>::value;
3043template <typename _Tp>
3044 inline constexpr bool is_function_v = is_function<_Tp>::value;
3045template <typename _Tp>
3046 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
3047template <typename _Tp>
3048 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
3049template <typename _Tp>
3050 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
3051template <typename _Tp>
3052 inline constexpr bool is_object_v = is_object<_Tp>::value;
3053template <typename _Tp>
3054 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
3055template <typename _Tp>
3056 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
3057template <typename _Tp>
3058 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
3059template <typename _Tp>
3060 inline constexpr bool is_const_v = is_const<_Tp>::value;
3061template <typename _Tp>
3062 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
3063template <typename _Tp>
3064 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
3065template <typename _Tp>
3066 inline constexpr bool is_trivially_copyable_v =
3067 is_trivially_copyable<_Tp>::value;
3068template <typename _Tp>
3069 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
3070#pragma GCC diagnostic push
3071#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
3072template <typename _Tp>
3073 _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead")
3074 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
3075#pragma GCC diagnostic pop
3076template <typename _Tp>
3077 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
3078template <typename _Tp>
3079 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
3080template <typename _Tp>
3081 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
3082template <typename _Tp>
3083 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
3084template <typename _Tp>
3085 inline constexpr bool is_final_v = is_final<_Tp>::value;
3086template <typename _Tp>
3087 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
3088template <typename _Tp>
3089 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
3090template <typename _Tp, typename... _Args>
3091 inline constexpr bool is_constructible_v =
3092 is_constructible<_Tp, _Args...>::value;
3093template <typename _Tp>
3094 inline constexpr bool is_default_constructible_v =
3095 is_default_constructible<_Tp>::value;
3096template <typename _Tp>
3097 inline constexpr bool is_copy_constructible_v =
3098 is_copy_constructible<_Tp>::value;
3099template <typename _Tp>
3100 inline constexpr bool is_move_constructible_v =
3101 is_move_constructible<_Tp>::value;
3102template <typename _Tp, typename _Up>
3103 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
3104template <typename _Tp>
3105 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
3106template <typename _Tp>
3107 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
3108template <typename _Tp>
3109 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
3110template <typename _Tp, typename... _Args>
3111 inline constexpr bool is_trivially_constructible_v =
3112 is_trivially_constructible<_Tp, _Args...>::value;
3113template <typename _Tp>
3114 inline constexpr bool is_trivially_default_constructible_v =
3115 is_trivially_default_constructible<_Tp>::value;
3116template <typename _Tp>
3117 inline constexpr bool is_trivially_copy_constructible_v =
3118 is_trivially_copy_constructible<_Tp>::value;
3119template <typename _Tp>
3120 inline constexpr bool is_trivially_move_constructible_v =
3121 is_trivially_move_constructible<_Tp>::value;
3122template <typename _Tp, typename _Up>
3123 inline constexpr bool is_trivially_assignable_v =
3124 is_trivially_assignable<_Tp, _Up>::value;
3125template <typename _Tp>
3126 inline constexpr bool is_trivially_copy_assignable_v =
3127 is_trivially_copy_assignable<_Tp>::value;
3128template <typename _Tp>
3129 inline constexpr bool is_trivially_move_assignable_v =
3130 is_trivially_move_assignable<_Tp>::value;
3131template <typename _Tp>
3132 inline constexpr bool is_trivially_destructible_v =
3133 is_trivially_destructible<_Tp>::value;
3134template <typename _Tp, typename... _Args>
3135 inline constexpr bool is_nothrow_constructible_v =
3136 is_nothrow_constructible<_Tp, _Args...>::value;
3137template <typename _Tp>
3138 inline constexpr bool is_nothrow_default_constructible_v =
3139 is_nothrow_default_constructible<_Tp>::value;
3140template <typename _Tp>
3141 inline constexpr bool is_nothrow_copy_constructible_v =
3142 is_nothrow_copy_constructible<_Tp>::value;
3143template <typename _Tp>
3144 inline constexpr bool is_nothrow_move_constructible_v =
3145 is_nothrow_move_constructible<_Tp>::value;
3146template <typename _Tp, typename _Up>
3147 inline constexpr bool is_nothrow_assignable_v =
3148 is_nothrow_assignable<_Tp, _Up>::value;
3149template <typename _Tp>
3150 inline constexpr bool is_nothrow_copy_assignable_v =
3151 is_nothrow_copy_assignable<_Tp>::value;
3152template <typename _Tp>
3153 inline constexpr bool is_nothrow_move_assignable_v =
3154 is_nothrow_move_assignable<_Tp>::value;
3155template <typename _Tp>
3156 inline constexpr bool is_nothrow_destructible_v =
3157 is_nothrow_destructible<_Tp>::value;
3158template <typename _Tp>
3159 inline constexpr bool has_virtual_destructor_v =
3160 has_virtual_destructor<_Tp>::value;
3161template <typename _Tp>
3162 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
3163template <typename _Tp>
3164 inline constexpr size_t rank_v = rank<_Tp>::value;
3165template <typename _Tp, unsigned _Idx = 0>
3166 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
3167#ifdef _GLIBCXX_BUILTIN_IS_SAME_AS
3168template <typename _Tp, typename _Up>
3169 inline constexpr bool is_same_v = _GLIBCXX_BUILTIN_IS_SAME_AS(_Tp, _Up);
3170#else
3171template <typename _Tp, typename _Up>
3172 inline constexpr bool is_same_v = std::is_same<_Tp, _Up>::value;
3173#endif
3174template <typename _Base, typename _Derived>
3175 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
3176template <typename _From, typename _To>
3177 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
3178
3179#ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
3180# define __cpp_lib_has_unique_object_representations 201606
3181 /// has_unique_object_representations
3182 template<typename _Tp>
3183 struct has_unique_object_representations
3184 : bool_constant<__has_unique_object_representations(
3185 remove_cv_t<remove_all_extents_t<_Tp>>
3186 )>
3187 {
3188 static_assert(std::__is_complete_or_unbounded(__type_identity<_Tp>{}),
3189 "template argument must be a complete class or an unbounded array");
3190 };
3191
3192 template<typename _Tp>
3193 inline constexpr bool has_unique_object_representations_v
3194 = has_unique_object_representations<_Tp>::value;
3195#endif
3196
3197#ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
3198# define __cpp_lib_is_aggregate 201703
3199 /// is_aggregate
3200 template<typename _Tp>
3201 struct is_aggregate
3202 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)>
3203 { };
3204
3205 /// is_aggregate_v
3206 template<typename _Tp>
3207 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
3208#endif
3209#endif // C++17
3210
3211#if __cplusplus > 201703L
3212 /// Remove references and cv-qualifiers.
3213 template<typename _Tp>
3214 struct remove_cvref
3215 {
3216 using type = __remove_cvref_t<_Tp>;
3217 };
3218
3219 template<typename _Tp>
3220 using remove_cvref_t = __remove_cvref_t<_Tp>;
3221
3222 /// Identity metafunction.
3223 template<typename _Tp>
3224 struct type_identity { using type = _Tp; };
3225
3226 template<typename _Tp>
3227 using type_identity_t = typename type_identity<_Tp>::type;
3228
3229#define __cpp_lib_unwrap_ref 201811L
3230
3231 /// Unwrap a reference_wrapper
3232 template<typename _Tp>
3233 struct unwrap_reference { using type = _Tp; };
3234
3235 template<typename _Tp>
3236 struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; };
3237
3238 template<typename _Tp>
3239 using unwrap_reference_t = typename unwrap_reference<_Tp>::type;
3240
3241 /// Decay type and if it's a reference_wrapper, unwrap it
3242 template<typename _Tp>
3243 struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; };
3244
3245 template<typename _Tp>
3246 using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
3247
3248#define __cpp_lib_bounded_array_traits 201902L
3249
3250 /// True for a type that is an array of known bound.
3251 template<typename _Tp>
3252 struct is_bounded_array
3253 : public __is_array_known_bounds<_Tp>
3254 { };
3255
3256 /// True for a type that is an array of unknown bound.
3257 template<typename _Tp>
3258 struct is_unbounded_array
3259 : public __is_array_unknown_bounds<_Tp>
3260 { };
3261
3262 template<typename _Tp>
3263 inline constexpr bool is_bounded_array_v
3264 = is_bounded_array<_Tp>::value;
3265
3266 template<typename _Tp>
3267 inline constexpr bool is_unbounded_array_v
3268 = is_unbounded_array<_Tp>::value;
3269
3270#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
3271
3272#define __cpp_lib_is_constant_evaluated 201811L
3273
3274 constexpr inline bool
3275 is_constant_evaluated() noexcept
3276 { return __builtin_is_constant_evaluated(); }
3277#endif
3278
3279 template<typename _From, typename _To>
3280 using __copy_cv = typename __match_cv_qualifiers<_From, _To>::__type;
3281
3282 template<typename _Xp, typename _Yp>
3283 using __cond_res
3284 = decltype(false ? declval<_Xp(&)()>()() : declval<_Yp(&)()>()());
3285
3286 template<typename _Ap, typename _Bp, typename = void>
3287 struct __common_ref_impl
3288 { };
3289
3290 // [meta.trans.other], COMMON-REF(A, B)
3291 template<typename _Ap, typename _Bp>
3292 using __common_ref = typename __common_ref_impl<_Ap, _Bp>::type;
3293
3294 // If A and B are both lvalue reference types, ...
3295 template<typename _Xp, typename _Yp>
3296 struct __common_ref_impl<_Xp&, _Yp&,
3297 __void_t<__cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>>>
3298 { using type = __cond_res<__copy_cv<_Xp, _Yp>&, __copy_cv<_Yp, _Xp>&>; };
3299
3300 // let C be remove_reference_t<COMMON-REF(X&, Y&)>&&
3301 template<typename _Xp, typename _Yp>
3302 using __common_ref_C = remove_reference_t<__common_ref<_Xp&, _Yp&>>&&;
3303
3304 // If A and B are both rvalue reference types, ...
3305 template<typename _Xp, typename _Yp>
3306 struct __common_ref_impl<_Xp&&, _Yp&&,
3307 _Require<is_convertible<_Xp&&, __common_ref_C<_Xp, _Yp>>,
3308 is_convertible<_Yp&&, __common_ref_C<_Xp, _Yp>>>>
3309 { using type = __common_ref_C<_Xp, _Yp>; };
3310
3311 // let D be COMMON-REF(const X&, Y&)
3312 template<typename _Xp, typename _Yp>
3313 using __common_ref_D = __common_ref<const _Xp&, _Yp&>;
3314
3315 // If A is an rvalue reference and B is an lvalue reference, ...
3316 template<typename _Xp, typename _Yp>
3317 struct __common_ref_impl<_Xp&&, _Yp&,
3318 _Require<is_convertible<_Xp&&, __common_ref_D<_Xp, _Yp>>>>
3319 { using type = __common_ref_D<_Xp, _Yp>; };
3320
3321 // If A is an lvalue reference and B is an rvalue reference, ...
3322 template<typename _Xp, typename _Yp>
3323 struct __common_ref_impl<_Xp&, _Yp&&>
3324 : __common_ref_impl<_Yp&&, _Xp&>
3325 { };
3326
3327 template<typename _Tp, typename _Up,
3328 template<typename> class _TQual, template<typename> class _UQual>
3329 struct basic_common_reference
3330 { };
3331
3332 template<typename _Tp>
3333 struct __xref
3334 { template<typename _Up> using __type = __copy_cv<_Tp, _Up>; };
3335
3336 template<typename _Tp>
3337 struct __xref<_Tp&>
3338 { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&; };
3339
3340 template<typename _Tp>
3341 struct __xref<_Tp&&>
3342 { template<typename _Up> using __type = __copy_cv<_Tp, _Up>&&; };
3343
3344 template<typename _Tp1, typename _Tp2>
3345 using __basic_common_ref
3346 = typename basic_common_reference<remove_cvref_t<_Tp1>,
3347 remove_cvref_t<_Tp2>,
3348 __xref<_Tp1>::template __type,
3349 __xref<_Tp2>::template __type>::type;
3350
3351 template<typename... _Tp>
3352 struct common_reference;
3353
3354 template<typename... _Tp>
3355 using common_reference_t = typename common_reference<_Tp...>::type;
3356
3357 // If sizeof...(T) is zero, there shall be no member type.
3358 template<>
3359 struct common_reference<>
3360 { };
3361
3362 // If sizeof...(T) is one ...
3363 template<typename _Tp0>
3364 struct common_reference<_Tp0>
3365 { using type = _Tp0; };
3366
3367 template<typename _Tp1, typename _Tp2, int _Bullet = 1, typename = void>
3368 struct __common_reference_impl
3369 : __common_reference_impl<_Tp1, _Tp2, _Bullet + 1>
3370 { };
3371
3372 // If sizeof...(T) is two ...
3373 template<typename _Tp1, typename _Tp2>
3374 struct common_reference<_Tp1, _Tp2>
3375 : __common_reference_impl<_Tp1, _Tp2>
3376 { };
3377
3378 // If T1 and T2 are reference types and COMMON-REF(T1, T2) is well-formed, ...
3379 template<typename _Tp1, typename _Tp2>
3380 struct __common_reference_impl<_Tp1&, _Tp2&, 1,
3381 void_t<__common_ref<_Tp1&, _Tp2&>>>
3382 { using type = __common_ref<_Tp1&, _Tp2&>; };
3383
3384 template<typename _Tp1, typename _Tp2>
3385 struct __common_reference_impl<_Tp1&&, _Tp2&&, 1,
3386 void_t<__common_ref<_Tp1&&, _Tp2&&>>>
3387 { using type = __common_ref<_Tp1&&, _Tp2&&>; };
3388
3389 template<typename _Tp1, typename _Tp2>
3390 struct __common_reference_impl<_Tp1&, _Tp2&&, 1,
3391 void_t<__common_ref<_Tp1&, _Tp2&&>>>
3392 { using type = __common_ref<_Tp1&, _Tp2&&>; };
3393
3394 template<typename _Tp1, typename _Tp2>
3395 struct __common_reference_impl<_Tp1&&, _Tp2&, 1,
3396 void_t<__common_ref<_Tp1&&, _Tp2&>>>
3397 { using type = __common_ref<_Tp1&&, _Tp2&>; };
3398
3399 // Otherwise, if basic_common_reference<...>::type is well-formed, ...
3400 template<typename _Tp1, typename _Tp2>
3401 struct __common_reference_impl<_Tp1, _Tp2, 2,
3402 void_t<__basic_common_ref<_Tp1, _Tp2>>>
3403 { using type = __basic_common_ref<_Tp1, _Tp2>; };
3404
3405 // Otherwise, if COND-RES(T1, T2) is well-formed, ...
3406 template<typename _Tp1, typename _Tp2>
3407 struct __common_reference_impl<_Tp1, _Tp2, 3,
3408 void_t<__cond_res<_Tp1, _Tp2>>>
3409 { using type = __cond_res<_Tp1, _Tp2>; };
3410
3411 // Otherwise, if common_type_t<T1, T2> is well-formed, ...
3412 template<typename _Tp1, typename _Tp2>
3413 struct __common_reference_impl<_Tp1, _Tp2, 4,
3414 void_t<common_type_t<_Tp1, _Tp2>>>
3415 { using type = common_type_t<_Tp1, _Tp2>; };
3416
3417 // Otherwise, there shall be no member type.
3418 template<typename _Tp1, typename _Tp2>
3419 struct __common_reference_impl<_Tp1, _Tp2, 5, void>
3420 { };
3421
3422 // Otherwise, if sizeof...(T) is greater than two, ...
3423 template<typename _Tp1, typename _Tp2, typename... _Rest>
3424 struct common_reference<_Tp1, _Tp2, _Rest...>
3425 : __common_type_fold<common_reference<_Tp1, _Tp2>,
3426 __common_type_pack<_Rest...>>
3427 { };
3428
3429 // Reuse __common_type_fold for common_reference<T1, T2, Rest...>
3430 template<typename _Tp1, typename _Tp2, typename... _Rest>
3431 struct __common_type_fold<common_reference<_Tp1, _Tp2>,
3432 __common_type_pack<_Rest...>,
3433 void_t<common_reference_t<_Tp1, _Tp2>>>
3434 : public common_reference<common_reference_t<_Tp1, _Tp2>, _Rest...>
3435 { };
3436
3437#endif // C++2a
3438
3439_GLIBCXX_END_NAMESPACE_VERSION
3440} // namespace std
3441
3442#endif // C++11
3443
3444#endif // _GLIBCXX_TYPE_TRAITS
static const size_t alignment_value
The value of the strictest alignment of _Types.
Definition: type_traits:2104
typename remove_reference< _Tp >::type remove_reference_t
Alias template for remove_reference.
Definition: type_traits:1622
typename result_of< _Tp >::type result_of_t
Alias template for result_of.
Definition: type_traits:2557
typename add_rvalue_reference< _Tp >::type add_rvalue_reference_t
Alias template for add_rvalue_reference.
Definition: type_traits:1630
typename make_unsigned< _Tp >::type make_unsigned_t
Alias template for make_unsigned.
Definition: type_traits:1952
void void_t
A metafunction that always yields void, used for detecting valid types.
Definition: type_traits:2563
typename aligned_storage< _Len, _Align >::type aligned_storage_t
Alias template for aligned_storage.
Definition: type_traits:2530
typename remove_cv< _Tp >::type remove_cv_t
Alias template for remove_cv.
Definition: type_traits:1561
typename remove_all_extents< _Tp >::type remove_all_extents_t
Alias template for remove_all_extents.
Definition: type_traits:1990
typename common_type< _Tp... >::type common_type_t
Alias template for common_type.
Definition: type_traits:2549
typename conditional< _Cond, _Iftrue, _Iffalse >::type conditional_t
Alias template for conditional.
Definition: type_traits:2545
typename add_const< _Tp >::type add_const_t
Alias template for add_const.
Definition: type_traits:1565
typename remove_pointer< _Tp >::type remove_pointer_t
Alias template for remove_pointer.
Definition: type_traits:2027
typename add_cv< _Tp >::type add_cv_t
Alias template for add_cv.
Definition: type_traits:1573
typename remove_const< _Tp >::type remove_const_t
Alias template for remove_const.
Definition: type_traits:1553
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:75
typename add_volatile< _Tp >::type add_volatile_t
Alias template for add_volatile.
Definition: type_traits:1569
typename remove_volatile< _Tp >::type remove_volatile_t
Alias template for remove_volatile.
Definition: type_traits:1557
typename add_lvalue_reference< _Tp >::type add_lvalue_reference_t
Alias template for add_lvalue_reference.
Definition: type_traits:1626
typename add_pointer< _Tp >::type add_pointer_t
Alias template for add_pointer.
Definition: type_traits:2031
typename remove_extent< _Tp >::type remove_extent_t
Alias template for remove_extent.
Definition: type_traits:1986
typename underlying_type< _Tp >::type underlying_type_t
Alias template for underlying_type.
Definition: type_traits:2553
typename decay< _Tp >::type decay_t
Alias template for decay.
Definition: type_traits:2537
typename make_signed< _Tp >::type make_signed_t
Alias template for make_signed.
Definition: type_traits:1948
typename enable_if< _Cond, _Tp >::type enable_if_t
Alias template for enable_if.
Definition: type_traits:2541
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:78
ISO C++ entities toplevel namespace is std.
constexpr bool is_nothrow_swappable_v
is_nothrow_swappable_v
Definition: type_traits:2731
constexpr bool is_swappable_v
is_swappable_v
Definition: type_traits:2726
constexpr bool is_swappable_with_v
is_swappable_with_v
Definition: type_traits:2810
constexpr bool is_nothrow_swappable_with_v
is_nothrow_swappable_with_v
Definition: type_traits:2815
integral_constant
Definition: type_traits:58
Define a member typedef type to one of two argument types.
Definition: type_traits:2188
is_reference
Definition: type_traits:530
is_function
Definition: type_traits:491
is_void
Definition: type_traits:250
remove_cv
Definition: type_traits:1515
is_const
Definition: type_traits:650
is_integral
Definition: type_traits:367
is_floating_point
Definition: type_traits:395
is_array
Definition: type_traits:400
is_pointer
Definition: type_traits:422
is_lvalue_reference
Definition: type_traits:427
is_rvalue_reference
Definition: type_traits:436
is_member_object_pointer
Definition: type_traits:454
is_member_function_pointer
Definition: type_traits:468
is_enum
Definition: type_traits:474
is_union
Definition: type_traits:480
is_class
Definition: type_traits:486
is_null_pointer (LWG 2247).
Definition: type_traits:515
__is_nullptr_t (deprecated extension).
Definition: type_traits:521
is_arithmetic
Definition: type_traits:536
is_fundamental
Definition: type_traits:543
is_object
Definition: type_traits:550
is_member_pointer
Definition: type_traits:579
is_scalar
Definition: type_traits:560
is_compound
Definition: type_traits:565
is_same
Definition: type_traits:1388
is_volatile
Definition: type_traits:659
is_trivial
Definition: type_traits:669
is_standard_layout
Definition: type_traits:687
is_pod (deprecated in C++20)
Definition: type_traits:699
is_literal_type
Definition: type_traits:708
is_empty
Definition: type_traits:717
is_polymorphic
Definition: type_traits:723
is_final
Definition: type_traits:731
is_abstract
Definition: type_traits:738
extent
Definition: type_traits:1361
remove_all_extents
Definition: type_traits:1973
is_destructible
Definition: type_traits:843
is_nothrow_destructible
Definition: type_traits:894
is_constructible
Definition: type_traits:908
is_default_constructible
Definition: type_traits:917
is_copy_constructible
Definition: type_traits:938
is_move_constructible
Definition: type_traits:959
is_nothrow_constructible
Definition: type_traits:998
is_nothrow_default_constructible
Definition: type_traits:1007
is_nothrow_copy_constructible
Definition: type_traits:1029
is_nothrow_move_constructible
Definition: type_traits:1050
is_assignable
Definition: type_traits:1059
is_copy_assignable
Definition: type_traits:1080
is_move_assignable
Definition: type_traits:1101
is_nothrow_assignable
Definition: type_traits:1121
is_nothrow_copy_assignable
Definition: type_traits:1142
is_nothrow_move_assignable
Definition: type_traits:1163
is_trivially_constructible
Definition: type_traits:1172
is_trivially_default_constructible
Definition: type_traits:1181
is_trivially_copy_constructible
Definition: type_traits:1234
is_trivially_move_constructible
Definition: type_traits:1257
is_trivially_assignable
Definition: type_traits:1266
is_trivially_copy_assignable
Definition: type_traits:1287
is_trivially_move_assignable
Definition: type_traits:1308
is_trivially_destructible
Definition: type_traits:1318
has_virtual_destructor
Definition: type_traits:1328
alignment_of
Definition: type_traits:1340
is_base_of
Definition: type_traits:1401
is_convertible
Definition: type_traits:1437
remove_const
Definition: type_traits:1497
remove_volatile
Definition: type_traits:1506
add_const
Definition: type_traits:1532
add_volatile
Definition: type_traits:1537
add_cv
Definition: type_traits:1542
remove_reference
Definition: type_traits:1581
add_lvalue_reference
Definition: type_traits:1603
add_rvalue_reference
Definition: type_traits:1617
make_unsigned
Definition: type_traits:1813
make_signed
Definition: type_traits:1939
remove_extent
Definition: type_traits:1960
remove_pointer
Definition: type_traits:2007
Alignment type.
Definition: type_traits:2057
Provide aligned storage for types.
Definition: type_traits:2095
aligned_storage< _S_len, alignment_value >::type type
The storage.
Definition: type_traits:2106
Primary class template for reference_wrapper.
Definition: refwrap.h:300
Define a member typedef type only if a boolean constant is true.
Definition: type_traits:2170
common_type
Definition: type_traits:2202
The underlying type of an enum.
Definition: type_traits:2313
result_of
Definition: type_traits:2331
Implementation of the detection idiom (negative case).
Definition: type_traits:2570
Metafunctions used for detecting swappable types: p0185r1.
Definition: type_traits:2709
is_nothrow_swappable
Definition: type_traits:2718
is_swappable_with
Definition: type_traits:2799
is_nothrow_swappable_with
Definition: type_traits:2805