1// C++11 <type_traits> -*- C++ -*-
2
3// Copyright (C) 2007-2019 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>
57 struct integral_constant
58 {
59 static constexpr _Tp value = __v;
60 typedef _Tp value_type;
61 typedef integral_constant<_Tp, __v> 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>
72 constexpr _Tp integral_constant<_Tp, __v>::value;
73
74 /// The type used as a compile-time boolean with true value.
75 typedef integral_constant<bool, true> true_type;
76
77 /// The type used as a compile-time boolean with false value.
78 typedef integral_constant<bool, false> false_type;
79
80 template<bool __v>
81 using __bool_constant = integral_constant<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...>
95 struct __or_;
96
97 template<>
98 struct __or_<>
99 : public false_type
100 { };
101
102 template<typename _B1>
103 struct __or_<_B1>
104 : public _B1
105 { };
106
107 template<typename _B1, typename _B2>
108 struct __or_<_B1, _B2>
109 : public conditional<_B1::value, _B1, _B2>::type
110 { };
111
112 template<typename _B1, typename _B2, typename _B3, typename... _Bn>
113 struct __or_<_B1, _B2, _B3, _Bn...>
114 : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type
115 { };
116
117 template<typename...>
118 struct __and_;
119
120 template<>
121 struct __and_<>
122 : public true_type
123 { };
124
125 template<typename _B1>
126 struct __and_<_B1>
127 : public _B1
128 { };
129
130 template<typename _B1, typename _B2>
131 struct __and_<_B1, _B2>
132 : public conditional<_B1::value, _B2, _B1>::type
133 { };
134
135 template<typename _B1, typename _B2, typename _B3, typename... _Bn>
136 struct __and_<_B1, _B2, _B3, _Bn...>
137 : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
138 { };
139
140 template<typename _Pp>
141 struct __not_
142 : public __bool_constant<!bool(_Pp::value)>
143 { };
144
145#if __cplusplus >= 201703L
146
147 template<typename... _Bn>
148 inline constexpr bool __or_v = __or_<_Bn...>::value;
149 template<typename... _Bn>
150 inline constexpr bool __and_v = __and_<_Bn...>::value;
151
152#define __cpp_lib_logical_traits 201510
153
154 template<typename... _Bn>
155 struct conjunction
156 : __and_<_Bn...>
157 { };
158
159 template<typename... _Bn>
160 struct disjunction
161 : __or_<_Bn...>
162 { };
163
164 template<typename _Pp>
165 struct negation
166 : __not_<_Pp>
167 { };
168
169 template<typename... _Bn>
170 inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
171
172 template<typename... _Bn>
173 inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
174
175 template<typename _Pp>
176 inline constexpr bool negation_v = negation<_Pp>::value;
177
178#endif // C++17
179
180 // For several sfinae-friendly trait implementations we transport both the
181 // result information (as the member type) and the failure information (no
182 // member type). This is very similar to std::enable_if, but we cannot use
183 // them, because we need to derive from them as an implementation detail.
184
185 template<typename _Tp>
186 struct __success_type
187 { typedef _Tp type; };
188
189 struct __failure_type
190 { };
191
192 // Primary type categories.
193
194 template<typename>
195 struct remove_cv;
196
197 template<typename>
198 struct __is_void_helper
199 : public false_type { };
200
201 template<>
202 struct __is_void_helper<void>
203 : public true_type { };
204
205 /// is_void
206 template<typename _Tp>
207 struct is_void
208 : public __is_void_helper<typename remove_cv<_Tp>::type>::type
209 { };
210
211 template<typename>
212 struct __is_integral_helper
213 : public false_type { };
214
215 template<>
216 struct __is_integral_helper<bool>
217 : public true_type { };
218
219 template<>
220 struct __is_integral_helper<char>
221 : public true_type { };
222
223 template<>
224 struct __is_integral_helper<signed char>
225 : public true_type { };
226
227 template<>
228 struct __is_integral_helper<unsigned char>
229 : public true_type { };
230
231#ifdef _GLIBCXX_USE_WCHAR_T
232 template<>
233 struct __is_integral_helper<wchar_t>
234 : public true_type { };
235#endif
236
237#ifdef _GLIBCXX_USE_CHAR8_T
238 template<>
239 struct __is_integral_helper<char8_t>
240 : public true_type { };
241#endif
242
243 template<>
244 struct __is_integral_helper<char16_t>
245 : public true_type { };
246
247 template<>
248 struct __is_integral_helper<char32_t>
249 : public true_type { };
250
251 template<>
252 struct __is_integral_helper<short>
253 : public true_type { };
254
255 template<>
256 struct __is_integral_helper<unsigned short>
257 : public true_type { };
258
259 template<>
260 struct __is_integral_helper<int>
261 : public true_type { };
262
263 template<>
264 struct __is_integral_helper<unsigned int>
265 : public true_type { };
266
267 template<>
268 struct __is_integral_helper<long>
269 : public true_type { };
270
271 template<>
272 struct __is_integral_helper<unsigned long>
273 : public true_type { };
274
275 template<>
276 struct __is_integral_helper<long long>
277 : public true_type { };
278
279 template<>
280 struct __is_integral_helper<unsigned long long>
281 : public true_type { };
282
283 // Conditionalizing on __STRICT_ANSI__ here will break any port that
284 // uses one of these types for size_t.
285#if defined(__GLIBCXX_TYPE_INT_N_0)
286 template<>
287 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
288 : public true_type { };
289
290 template<>
291 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
292 : public true_type { };
293#endif
294#if defined(__GLIBCXX_TYPE_INT_N_1)
295 template<>
296 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
297 : public true_type { };
298
299 template<>
300 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
301 : public true_type { };
302#endif
303#if defined(__GLIBCXX_TYPE_INT_N_2)
304 template<>
305 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
306 : public true_type { };
307
308 template<>
309 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
310 : public true_type { };
311#endif
312#if defined(__GLIBCXX_TYPE_INT_N_3)
313 template<>
314 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
315 : public true_type { };
316
317 template<>
318 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
319 : public true_type { };
320#endif
321
322 /// is_integral
323 template<typename _Tp>
324 struct is_integral
325 : public __is_integral_helper<typename remove_cv<_Tp>::type>::type
326 { };
327
328 template<typename>
329 struct __is_floating_point_helper
330 : public false_type { };
331
332 template<>
333 struct __is_floating_point_helper<float>
334 : public true_type { };
335
336 template<>
337 struct __is_floating_point_helper<double>
338 : public true_type { };
339
340 template<>
341 struct __is_floating_point_helper<long double>
342 : public true_type { };
343
344#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) && !defined(__CUDACC__)
345 template<>
346 struct __is_floating_point_helper<__float128>
347 : public true_type { };
348#endif
349
350 /// is_floating_point
351 template<typename _Tp>
352 struct is_floating_point
353 : public __is_floating_point_helper<typename remove_cv<_Tp>::type>::type
354 { };
355
356 /// is_array
357 template<typename>
358 struct is_array
359 : public false_type { };
360
361 template<typename _Tp, std::size_t _Size>
362 struct is_array<_Tp[_Size]>
363 : public true_type { };
364
365 template<typename _Tp>
366 struct is_array<_Tp[]>
367 : public true_type { };
368
369 template<typename>
370 struct __is_pointer_helper
371 : public false_type { };
372
373 template<typename _Tp>
374 struct __is_pointer_helper<_Tp*>
375 : public true_type { };
376
377 /// is_pointer
378 template<typename _Tp>
379 struct is_pointer
380 : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type
381 { };
382
383 /// is_lvalue_reference
384 template<typename>
385 struct is_lvalue_reference
386 : public false_type { };
387
388 template<typename _Tp>
389 struct is_lvalue_reference<_Tp&>
390 : public true_type { };
391
392 /// is_rvalue_reference
393 template<typename>
394 struct is_rvalue_reference
395 : public false_type { };
396
397 template<typename _Tp>
398 struct is_rvalue_reference<_Tp&&>
399 : public true_type { };
400
401 template<typename>
402 struct is_function;
403
404 template<typename>
405 struct __is_member_object_pointer_helper
406 : public false_type { };
407
408 template<typename _Tp, typename _Cp>
409 struct __is_member_object_pointer_helper<_Tp _Cp::*>
410 : public __not_<is_function<_Tp>>::type { };
411
412 /// is_member_object_pointer
413 template<typename _Tp>
414 struct is_member_object_pointer
415 : public __is_member_object_pointer_helper<
416 typename remove_cv<_Tp>::type>::type
417 { };
418
419 template<typename>
420 struct __is_member_function_pointer_helper
421 : public false_type { };
422
423 template<typename _Tp, typename _Cp>
424 struct __is_member_function_pointer_helper<_Tp _Cp::*>
425 : public is_function<_Tp>::type { };
426
427 /// is_member_function_pointer
428 template<typename _Tp>
429 struct is_member_function_pointer
430 : public __is_member_function_pointer_helper<
431 typename remove_cv<_Tp>::type>::type
432 { };
433
434 /// is_enum
435 template<typename _Tp>
436 struct is_enum
437 : public integral_constant<bool, __is_enum(_Tp)>
438 { };
439
440 /// is_union
441 template<typename _Tp>
442 struct is_union
443 : public integral_constant<bool, __is_union(_Tp)>
444 { };
445
446 /// is_class
447 template<typename _Tp>
448 struct is_class
449 : public integral_constant<bool, __is_class(_Tp)>
450 { };
451
452 /// is_function
453 template<typename>
454 struct is_function
455 : public false_type { };
456
457 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
458 struct is_function<_Res(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL>
459 : public true_type { };
460
461 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
462 struct is_function<_Res(_ArgTypes...) & _GLIBCXX_NOEXCEPT_QUAL>
463 : public true_type { };
464
465 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
466 struct is_function<_Res(_ArgTypes...) && _GLIBCXX_NOEXCEPT_QUAL>
467 : public true_type { };
468
469 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
470 struct is_function<_Res(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL>
471 : public true_type { };
472
473 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
474 struct is_function<_Res(_ArgTypes......) & _GLIBCXX_NOEXCEPT_QUAL>
475 : public true_type { };
476
477 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
478 struct is_function<_Res(_ArgTypes......) && _GLIBCXX_NOEXCEPT_QUAL>
479 : public true_type { };
480
481 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
482 struct is_function<_Res(_ArgTypes...) const _GLIBCXX_NOEXCEPT_QUAL>
483 : public true_type { };
484
485 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
486 struct is_function<_Res(_ArgTypes...) const & _GLIBCXX_NOEXCEPT_QUAL>
487 : public true_type { };
488
489 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
490 struct is_function<_Res(_ArgTypes...) const && _GLIBCXX_NOEXCEPT_QUAL>
491 : public true_type { };
492
493 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
494 struct is_function<_Res(_ArgTypes......) const _GLIBCXX_NOEXCEPT_QUAL>
495 : public true_type { };
496
497 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
498 struct is_function<_Res(_ArgTypes......) const & _GLIBCXX_NOEXCEPT_QUAL>
499 : public true_type { };
500
501 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
502 struct is_function<_Res(_ArgTypes......) const && _GLIBCXX_NOEXCEPT_QUAL>
503 : public true_type { };
504
505 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
506 struct is_function<_Res(_ArgTypes...) volatile _GLIBCXX_NOEXCEPT_QUAL>
507 : public true_type { };
508
509 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
510 struct is_function<_Res(_ArgTypes...) volatile & _GLIBCXX_NOEXCEPT_QUAL>
511 : public true_type { };
512
513 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
514 struct is_function<_Res(_ArgTypes...) volatile && _GLIBCXX_NOEXCEPT_QUAL>
515 : public true_type { };
516
517 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
518 struct is_function<_Res(_ArgTypes......) volatile _GLIBCXX_NOEXCEPT_QUAL>
519 : public true_type { };
520
521 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
522 struct is_function<_Res(_ArgTypes......) volatile & _GLIBCXX_NOEXCEPT_QUAL>
523 : public true_type { };
524
525 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
526 struct is_function<_Res(_ArgTypes......) volatile && _GLIBCXX_NOEXCEPT_QUAL>
527 : public true_type { };
528
529 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
530 struct is_function<_Res(_ArgTypes...) const volatile _GLIBCXX_NOEXCEPT_QUAL>
531 : public true_type { };
532
533 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
534 struct is_function<_Res(_ArgTypes...) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
535 : public true_type { };
536
537 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
538 struct is_function<_Res(_ArgTypes...) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
539 : public true_type { };
540
541 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
542 struct is_function<_Res(_ArgTypes......) const volatile _GLIBCXX_NOEXCEPT_QUAL>
543 : public true_type { };
544
545 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
546 struct is_function<_Res(_ArgTypes......) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
547 : public true_type { };
548
549 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
550 struct is_function<_Res(_ArgTypes......) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
551 : public true_type { };
552
553#define __cpp_lib_is_null_pointer 201309
554
555 template<typename>
556 struct __is_null_pointer_helper
557 : public false_type { };
558
559 template<>
560 struct __is_null_pointer_helper<std::nullptr_t>
561 : public true_type { };
562
563 /// is_null_pointer (LWG 2247).
564 template<typename _Tp>
565 struct is_null_pointer
566 : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type
567 { };
568
569 /// __is_nullptr_t (extension).
570 template<typename _Tp>
571 struct __is_nullptr_t
572 : public is_null_pointer<_Tp>
573 { };
574
575 // Composite type categories.
576
577 /// is_reference
578 template<typename _Tp>
579 struct is_reference
580 : public __or_<is_lvalue_reference<_Tp>,
581 is_rvalue_reference<_Tp>>::type
582 { };
583
584 /// is_arithmetic
585 template<typename _Tp>
586 struct is_arithmetic
587 : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
588 { };
589
590 /// is_fundamental
591 template<typename _Tp>
592 struct is_fundamental
593 : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
594 is_null_pointer<_Tp>>::type
595 { };
596
597 /// is_object
598 template<typename _Tp>
599 struct is_object
600 : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
601 is_void<_Tp>>>::type
602 { };
603
604 template<typename>
605 struct is_member_pointer;
606
607 /// is_scalar
608 template<typename _Tp>
609 struct is_scalar
610 : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
611 is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
612 { };
613
614 /// is_compound
615 template<typename _Tp>
616 struct is_compound
617 : public __not_<is_fundamental<_Tp>>::type { };
618
619 template<typename _Tp>
620 struct __is_member_pointer_helper
621 : public false_type { };
622
623 template<typename _Tp, typename _Cp>
624 struct __is_member_pointer_helper<_Tp _Cp::*>
625 : public true_type { };
626
627 /// is_member_pointer
628 template<typename _Tp>
629 struct is_member_pointer
630 : public __is_member_pointer_helper<typename remove_cv<_Tp>::type>::type
631 { };
632
633 // Utility to detect referenceable types ([defns.referenceable]).
634
635 template<typename _Tp>
636 struct __is_referenceable
637 : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
638 { };
639
640 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
641 struct __is_referenceable<_Res(_Args...) _GLIBCXX_NOEXCEPT_QUAL>
642 : public true_type
643 { };
644
645 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
646 struct __is_referenceable<_Res(_Args......) _GLIBCXX_NOEXCEPT_QUAL>
647 : public true_type
648 { };
649
650 // Type properties.
651
652 /// is_const
653 template<typename>
654 struct is_const
655 : public false_type { };
656
657 template<typename _Tp>
658 struct is_const<_Tp const>
659 : public true_type { };
660
661 /// is_volatile
662 template<typename>
663 struct is_volatile
664 : public false_type { };
665
666 template<typename _Tp>
667 struct is_volatile<_Tp volatile>
668 : public true_type { };
669
670 /// is_trivial
671 template<typename _Tp>
672 struct is_trivial
673 : public integral_constant<bool, __is_trivial(_Tp)>
674 { };
675
676 // is_trivially_copyable
677 template<typename _Tp>
678 struct is_trivially_copyable
679 : public integral_constant<bool, __is_trivially_copyable(_Tp)>
680 { };
681
682 /// is_standard_layout
683 template<typename _Tp>
684 struct is_standard_layout
685 : public integral_constant<bool, __is_standard_layout(_Tp)>
686 { };
687
688 /// is_pod
689 // Could use is_standard_layout && is_trivial instead of the builtin.
690 template<typename _Tp>
691 struct is_pod
692 : public integral_constant<bool, __is_pod(_Tp)>
693 { };
694
695 /// is_literal_type
696 template<typename _Tp>
697 struct is_literal_type
698 : public integral_constant<bool, __is_literal_type(_Tp)>
699 { };
700
701 /// is_empty
702 template<typename _Tp>
703 struct is_empty
704 : public integral_constant<bool, __is_empty(_Tp)>
705 { };
706
707 /// is_polymorphic
708 template<typename _Tp>
709 struct is_polymorphic
710 : public integral_constant<bool, __is_polymorphic(_Tp)>
711 { };
712
713#if __cplusplus >= 201402L
714#define __cpp_lib_is_final 201402L
715 /// is_final
716 template<typename _Tp>
717 struct is_final
718 : public integral_constant<bool, __is_final(_Tp)>
719 { };
720#endif
721
722 /// is_abstract
723 template<typename _Tp>
724 struct is_abstract
725 : public integral_constant<bool, __is_abstract(_Tp)>
726 { };
727
728 template<typename _Tp,
729 bool = is_arithmetic<_Tp>::value>
730 struct __is_signed_helper
731 : public false_type { };
732
733 template<typename _Tp>
734 struct __is_signed_helper<_Tp, true>
735 : public integral_constant<bool, _Tp(-1) < _Tp(0)>
736 { };
737
738 /// is_signed
739 template<typename _Tp>
740 struct is_signed
741 : public __is_signed_helper<_Tp>::type
742 { };
743
744 /// is_unsigned
745 template<typename _Tp>
746 struct is_unsigned
747 : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
748 { };
749
750
751 // Destructible and constructible type properties.
752
753 /**
754 * @brief Utility to simplify expressions used in unevaluated operands
755 * @ingroup utilities
756 */
757
758 template<typename _Tp, typename _Up = _Tp&&>
759 _Up
760 __declval(int);
761
762 template<typename _Tp>
763 _Tp
764 __declval(long);
765
766 template<typename _Tp>
767 auto declval() noexcept -> decltype(__declval<_Tp>(0));
768
769 template<typename, unsigned = 0>
770 struct extent;
771
772 template<typename>
773 struct remove_all_extents;
774
775 template<typename _Tp>
776 struct __is_array_known_bounds
777 : public integral_constant<bool, (extent<_Tp>::value > 0)>
778 { };
779
780 template<typename _Tp>
781 struct __is_array_unknown_bounds
782 : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
783 { };
784
785 // In N3290 is_destructible does not say anything about function
786 // types and abstract types, see LWG 2049. This implementation
787 // describes function types as non-destructible and all complete
788 // object types as destructible, iff the explicit destructor
789 // call expression is wellformed.
790 struct __do_is_destructible_impl
791 {
792 template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
793 static true_type __test(int);
794
795 template<typename>
796 static false_type __test(...);
797 };
798
799 template<typename _Tp>
800 struct __is_destructible_impl
801 : public __do_is_destructible_impl
802 {
803 typedef decltype(__test<_Tp>(0)) type;
804 };
805
806 template<typename _Tp,
807 bool = __or_<is_void<_Tp>,
808 __is_array_unknown_bounds<_Tp>,
809 is_function<_Tp>>::value,
810 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
811 struct __is_destructible_safe;
812
813 template<typename _Tp>
814 struct __is_destructible_safe<_Tp, false, false>
815 : public __is_destructible_impl<typename
816 remove_all_extents<_Tp>::type>::type
817 { };
818
819 template<typename _Tp>
820 struct __is_destructible_safe<_Tp, true, false>
821 : public false_type { };
822
823 template<typename _Tp>
824 struct __is_destructible_safe<_Tp, false, true>
825 : public true_type { };
826
827 /// is_destructible
828 template<typename _Tp>
829 struct is_destructible
830 : public __is_destructible_safe<_Tp>::type
831 { };
832
833 // is_nothrow_destructible requires that is_destructible is
834 // satisfied as well. We realize that by mimicing the
835 // implementation of is_destructible but refer to noexcept(expr)
836 // instead of decltype(expr).
837 struct __do_is_nt_destructible_impl
838 {
839 template<typename _Tp>
840 static __bool_constant<noexcept(declval<_Tp&>().~_Tp())>
841 __test(int);
842
843 template<typename>
844 static false_type __test(...);
845 };
846
847 template<typename _Tp>
848 struct __is_nt_destructible_impl
849 : public __do_is_nt_destructible_impl
850 {
851 typedef decltype(__test<_Tp>(0)) type;
852 };
853
854 template<typename _Tp,
855 bool = __or_<is_void<_Tp>,
856 __is_array_unknown_bounds<_Tp>,
857 is_function<_Tp>>::value,
858 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
859 struct __is_nt_destructible_safe;
860
861 template<typename _Tp>
862 struct __is_nt_destructible_safe<_Tp, false, false>
863 : public __is_nt_destructible_impl<typename
864 remove_all_extents<_Tp>::type>::type
865 { };
866
867 template<typename _Tp>
868 struct __is_nt_destructible_safe<_Tp, true, false>
869 : public false_type { };
870
871 template<typename _Tp>
872 struct __is_nt_destructible_safe<_Tp, false, true>
873 : public true_type { };
874
875 /// is_nothrow_destructible
876 template<typename _Tp>
877 struct is_nothrow_destructible
878 : public __is_nt_destructible_safe<_Tp>::type
879 { };
880
881 /// is_constructible
882 template<typename _Tp, typename... _Args>
883 struct is_constructible
884 : public __bool_constant<__is_constructible(_Tp, _Args...)>
885 { };
886
887 /// is_default_constructible
888 template<typename _Tp>
889 struct is_default_constructible
890 : public is_constructible<_Tp>::type
891 { };
892
893 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
894 struct __is_copy_constructible_impl;
895
896 template<typename _Tp>
897 struct __is_copy_constructible_impl<_Tp, false>
898 : public false_type { };
899
900 template<typename _Tp>
901 struct __is_copy_constructible_impl<_Tp, true>
902 : public is_constructible<_Tp, const _Tp&>
903 { };
904
905 /// is_copy_constructible
906 template<typename _Tp>
907 struct is_copy_constructible
908 : public __is_copy_constructible_impl<_Tp>
909 { };
910
911 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
912 struct __is_move_constructible_impl;
913
914 template<typename _Tp>
915 struct __is_move_constructible_impl<_Tp, false>
916 : public false_type { };
917
918 template<typename _Tp>
919 struct __is_move_constructible_impl<_Tp, true>
920 : public is_constructible<_Tp, _Tp&&>
921 { };
922
923 /// is_move_constructible
924 template<typename _Tp>
925 struct is_move_constructible
926 : public __is_move_constructible_impl<_Tp>
927 { };
928
929 template<typename _Tp>
930 struct __is_nt_default_constructible_atom
931 : public integral_constant<bool, noexcept(_Tp())>
932 { };
933
934 template<typename _Tp, bool = is_array<_Tp>::value>
935 struct __is_nt_default_constructible_impl;
936
937 template<typename _Tp>
938 struct __is_nt_default_constructible_impl<_Tp, true>
939 : public __and_<__is_array_known_bounds<_Tp>,
940 __is_nt_default_constructible_atom<typename
941 remove_all_extents<_Tp>::type>>
942 { };
943
944 template<typename _Tp>
945 struct __is_nt_default_constructible_impl<_Tp, false>
946 : public __is_nt_default_constructible_atom<_Tp>
947 { };
948
949 /// is_nothrow_default_constructible
950 template<typename _Tp>
951 struct is_nothrow_default_constructible
952 : public __and_<is_default_constructible<_Tp>,
953 __is_nt_default_constructible_impl<_Tp>>
954 { };
955
956 template<typename _Tp, typename... _Args>
957 struct __is_nt_constructible_impl
958 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
959 { };
960
961 template<typename _Tp, typename _Arg>
962 struct __is_nt_constructible_impl<_Tp, _Arg>
963 : public integral_constant<bool,
964 noexcept(static_cast<_Tp>(declval<_Arg>()))>
965 { };
966
967 template<typename _Tp>
968 struct __is_nt_constructible_impl<_Tp>
969 : public is_nothrow_default_constructible<_Tp>
970 { };
971
972 /// is_nothrow_constructible
973 template<typename _Tp, typename... _Args>
974 struct is_nothrow_constructible
975 : public __and_<is_constructible<_Tp, _Args...>,
976 __is_nt_constructible_impl<_Tp, _Args...>>
977 { };
978
979 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
980 struct __is_nothrow_copy_constructible_impl;
981
982 template<typename _Tp>
983 struct __is_nothrow_copy_constructible_impl<_Tp, false>
984 : public false_type { };
985
986 template<typename _Tp>
987 struct __is_nothrow_copy_constructible_impl<_Tp, true>
988 : public is_nothrow_constructible<_Tp, const _Tp&>
989 { };
990
991 /// is_nothrow_copy_constructible
992 template<typename _Tp>
993 struct is_nothrow_copy_constructible
994 : public __is_nothrow_copy_constructible_impl<_Tp>
995 { };
996
997 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
998 struct __is_nothrow_move_constructible_impl;
999
1000 template<typename _Tp>
1001 struct __is_nothrow_move_constructible_impl<_Tp, false>
1002 : public false_type { };
1003
1004 template<typename _Tp>
1005 struct __is_nothrow_move_constructible_impl<_Tp, true>
1006 : public is_nothrow_constructible<_Tp, _Tp&&>
1007 { };
1008
1009 /// is_nothrow_move_constructible
1010 template<typename _Tp>
1011 struct is_nothrow_move_constructible
1012 : public __is_nothrow_move_constructible_impl<_Tp>
1013 { };
1014
1015 /// is_assignable
1016 template<typename _Tp, typename _Up>
1017 struct is_assignable
1018 : public __bool_constant<__is_assignable(_Tp, _Up)>
1019 { };
1020
1021 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1022 struct __is_copy_assignable_impl;
1023
1024 template<typename _Tp>
1025 struct __is_copy_assignable_impl<_Tp, false>
1026 : public false_type { };
1027
1028 template<typename _Tp>
1029 struct __is_copy_assignable_impl<_Tp, true>
1030 : public is_assignable<_Tp&, const _Tp&>
1031 { };
1032
1033 /// is_copy_assignable
1034 template<typename _Tp>
1035 struct is_copy_assignable
1036 : public __is_copy_assignable_impl<_Tp>
1037 { };
1038
1039 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1040 struct __is_move_assignable_impl;
1041
1042 template<typename _Tp>
1043 struct __is_move_assignable_impl<_Tp, false>
1044 : public false_type { };
1045
1046 template<typename _Tp>
1047 struct __is_move_assignable_impl<_Tp, true>
1048 : public is_assignable<_Tp&, _Tp&&>
1049 { };
1050
1051 /// is_move_assignable
1052 template<typename _Tp>
1053 struct is_move_assignable
1054 : public __is_move_assignable_impl<_Tp>
1055 { };
1056
1057 template<typename _Tp, typename _Up>
1058 struct __is_nt_assignable_impl
1059 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1060 { };
1061
1062 /// is_nothrow_assignable
1063 template<typename _Tp, typename _Up>
1064 struct is_nothrow_assignable
1065 : public __and_<is_assignable<_Tp, _Up>,
1066 __is_nt_assignable_impl<_Tp, _Up>>
1067 { };
1068
1069 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1070 struct __is_nt_copy_assignable_impl;
1071
1072 template<typename _Tp>
1073 struct __is_nt_copy_assignable_impl<_Tp, false>
1074 : public false_type { };
1075
1076 template<typename _Tp>
1077 struct __is_nt_copy_assignable_impl<_Tp, true>
1078 : public is_nothrow_assignable<_Tp&, const _Tp&>
1079 { };
1080
1081 /// is_nothrow_copy_assignable
1082 template<typename _Tp>
1083 struct is_nothrow_copy_assignable
1084 : public __is_nt_copy_assignable_impl<_Tp>
1085 { };
1086
1087 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1088 struct __is_nt_move_assignable_impl;
1089
1090 template<typename _Tp>
1091 struct __is_nt_move_assignable_impl<_Tp, false>
1092 : public false_type { };
1093
1094 template<typename _Tp>
1095 struct __is_nt_move_assignable_impl<_Tp, true>
1096 : public is_nothrow_assignable<_Tp&, _Tp&&>
1097 { };
1098
1099 /// is_nothrow_move_assignable
1100 template<typename _Tp>
1101 struct is_nothrow_move_assignable
1102 : public __is_nt_move_assignable_impl<_Tp>
1103 { };
1104
1105 /// is_trivially_constructible
1106 template<typename _Tp, typename... _Args>
1107 struct is_trivially_constructible
1108 : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
1109 { };
1110
1111 /// is_trivially_default_constructible
1112 template<typename _Tp>
1113 struct is_trivially_default_constructible
1114 : public is_trivially_constructible<_Tp>::type
1115 { };
1116
1117 struct __do_is_implicitly_default_constructible_impl
1118 {
1119 template <typename _Tp>
1120 static void __helper(const _Tp&);
1121
1122 template <typename _Tp>
1123 static true_type __test(const _Tp&,
1124 decltype(__helper<const _Tp&>({}))* = 0);
1125
1126 static false_type __test(...);
1127 };
1128
1129 template<typename _Tp>
1130 struct __is_implicitly_default_constructible_impl
1131 : public __do_is_implicitly_default_constructible_impl
1132 {
1133 typedef decltype(__test(declval<_Tp>())) type;
1134 };
1135
1136 template<typename _Tp>
1137 struct __is_implicitly_default_constructible_safe
1138 : public __is_implicitly_default_constructible_impl<_Tp>::type
1139 { };
1140
1141 template <typename _Tp>
1142 struct __is_implicitly_default_constructible
1143 : public __and_<is_default_constructible<_Tp>,
1144 __is_implicitly_default_constructible_safe<_Tp>>
1145 { };
1146
1147 /// is_trivially_copy_constructible
1148
1149 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1150 struct __is_trivially_copy_constructible_impl;
1151
1152 template<typename _Tp>
1153 struct __is_trivially_copy_constructible_impl<_Tp, false>
1154 : public false_type { };
1155
1156 template<typename _Tp>
1157 struct __is_trivially_copy_constructible_impl<_Tp, true>
1158 : public __and_<is_copy_constructible<_Tp>,
1159 integral_constant<bool,
1160 __is_trivially_constructible(_Tp, const _Tp&)>>
1161 { };
1162
1163 template<typename _Tp>
1164 struct is_trivially_copy_constructible
1165 : public __is_trivially_copy_constructible_impl<_Tp>
1166 { };
1167
1168 /// is_trivially_move_constructible
1169
1170 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1171 struct __is_trivially_move_constructible_impl;
1172
1173 template<typename _Tp>
1174 struct __is_trivially_move_constructible_impl<_Tp, false>
1175 : public false_type { };
1176
1177 template<typename _Tp>
1178 struct __is_trivially_move_constructible_impl<_Tp, true>
1179 : public __and_<is_move_constructible<_Tp>,
1180 integral_constant<bool,
1181 __is_trivially_constructible(_Tp, _Tp&&)>>
1182 { };
1183
1184 template<typename _Tp>
1185 struct is_trivially_move_constructible
1186 : public __is_trivially_move_constructible_impl<_Tp>
1187 { };
1188
1189 /// is_trivially_assignable
1190 template<typename _Tp, typename _Up>
1191 struct is_trivially_assignable
1192 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1193 { };
1194
1195 /// is_trivially_copy_assignable
1196
1197 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1198 struct __is_trivially_copy_assignable_impl;
1199
1200 template<typename _Tp>
1201 struct __is_trivially_copy_assignable_impl<_Tp, false>
1202 : public false_type { };
1203
1204 template<typename _Tp>
1205 struct __is_trivially_copy_assignable_impl<_Tp, true>
1206 : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
1207 { };
1208
1209 template<typename _Tp>
1210 struct is_trivially_copy_assignable
1211 : public __is_trivially_copy_assignable_impl<_Tp>
1212 { };
1213
1214 /// is_trivially_move_assignable
1215
1216 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1217 struct __is_trivially_move_assignable_impl;
1218
1219 template<typename _Tp>
1220 struct __is_trivially_move_assignable_impl<_Tp, false>
1221 : public false_type { };
1222
1223 template<typename _Tp>
1224 struct __is_trivially_move_assignable_impl<_Tp, true>
1225 : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
1226 { };
1227
1228 template<typename _Tp>
1229 struct is_trivially_move_assignable
1230 : public __is_trivially_move_assignable_impl<_Tp>
1231 { };
1232
1233 /// is_trivially_destructible
1234 template<typename _Tp>
1235 struct is_trivially_destructible
1236 : public __and_<is_destructible<_Tp>,
1237 __bool_constant<__has_trivial_destructor(_Tp)>>
1238 { };
1239
1240
1241 /// has_virtual_destructor
1242 template<typename _Tp>
1243 struct has_virtual_destructor
1244 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1245 { };
1246
1247
1248 // type property queries.
1249
1250 /// alignment_of
1251 template<typename _Tp>
1252 struct alignment_of
1253 : public integral_constant<std::size_t, alignof(_Tp)> { };
1254
1255 /// rank
1256 template<typename>
1257 struct rank
1258 : public integral_constant<std::size_t, 0> { };
1259
1260 template<typename _Tp, std::size_t _Size>
1261 struct rank<_Tp[_Size]>
1262 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1263
1264 template<typename _Tp>
1265 struct rank<_Tp[]>
1266 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1267
1268 /// extent
1269 template<typename, unsigned _Uint>
1270 struct extent
1271 : public integral_constant<std::size_t, 0> { };
1272
1273 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1274 struct extent<_Tp[_Size], _Uint>
1275 : public integral_constant<std::size_t,
1276 _Uint == 0 ? _Size : extent<_Tp,
1277 _Uint - 1>::value>
1278 { };
1279
1280 template<typename _Tp, unsigned _Uint>
1281 struct extent<_Tp[], _Uint>
1282 : public integral_constant<std::size_t,
1283 _Uint == 0 ? 0 : extent<_Tp,
1284 _Uint - 1>::value>
1285 { };
1286
1287
1288 // Type relations.
1289
1290 /// is_same
1291 template<typename, typename>
1292 struct is_same
1293 : public false_type { };
1294
1295 template<typename _Tp>
1296 struct is_same<_Tp, _Tp>
1297 : public true_type { };
1298
1299 /// is_base_of
1300 template<typename _Base, typename _Derived>
1301 struct is_base_of
1302 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1303 { };
1304
1305 template<typename _From, typename _To,
1306 bool = __or_<is_void<_From>, is_function<_To>,
1307 is_array<_To>>::value>
1308 struct __is_convertible_helper
1309 {
1310 typedef typename is_void<_To>::type type;
1311 };
1312
1313 template<typename _From, typename _To>
1314 class __is_convertible_helper<_From, _To, false>
1315 {
1316 template<typename _To1>
1317 static void __test_aux(_To1) noexcept;
1318
1319 template<typename _From1, typename _To1,
1320 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1321 static true_type
1322 __test(int);
1323
1324 template<typename, typename>
1325 static false_type
1326 __test(...);
1327
1328 public:
1329 typedef decltype(__test<_From, _To>(0)) type;
1330 };
1331
1332
1333 /// is_convertible
1334 template<typename _From, typename _To>
1335 struct is_convertible
1336 : public __is_convertible_helper<_From, _To>::type
1337 { };
1338
1339#if __cplusplus > 201703L
1340 template<typename _From, typename _To,
1341 bool = __or_<is_void<_From>, is_function<_To>,
1342 is_array<_To>>::value>
1343 struct __is_nt_convertible_helper
1344 : is_void<_To>
1345 { };
1346
1347 template<typename _From, typename _To>
1348 class __is_nt_convertible_helper<_From, _To, false>
1349 {
1350 template<typename _To1>
1351 static void __test_aux(_To1) noexcept;
1352
1353 template<typename _From1, typename _To1>
1354 static bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
1355 __test(int);
1356
1357 template<typename, typename>
1358 static false_type
1359 __test(...);
1360
1361 public:
1362 using type = decltype(__test<_From, _To>(0));
1363 };
1364
1365 /// is_nothrow_convertible
1366 template<typename _From, typename _To>
1367 struct is_nothrow_convertible
1368 : public __is_nt_convertible_helper<_From, _To>::type
1369 { };
1370
1371 /// is_nothrow_convertible_v
1372 template<typename _From, typename _To>
1373 inline constexpr bool is_nothrow_convertible_v
1374 = is_nothrow_convertible<_From, _To>::value;
1375#endif // C++2a
1376
1377 // Const-volatile modifications.
1378
1379 /// remove_const
1380 template<typename _Tp>
1381 struct remove_const
1382 { typedef _Tp type; };
1383
1384 template<typename _Tp>
1385 struct remove_const<_Tp const>
1386 { typedef _Tp type; };
1387
1388 /// remove_volatile
1389 template<typename _Tp>
1390 struct remove_volatile
1391 { typedef _Tp type; };
1392
1393 template<typename _Tp>
1394 struct remove_volatile<_Tp volatile>
1395 { typedef _Tp type; };
1396
1397 /// remove_cv
1398 template<typename _Tp>
1399 struct remove_cv
1400 {
1401 typedef typename
1402 remove_const<typename remove_volatile<_Tp>::type>::type type;
1403 };
1404
1405 /// add_const
1406 template<typename _Tp>
1407 struct add_const
1408 { typedef _Tp const type; };
1409
1410 /// add_volatile
1411 template<typename _Tp>
1412 struct add_volatile
1413 { typedef _Tp volatile type; };
1414
1415 /// add_cv
1416 template<typename _Tp>
1417 struct add_cv
1418 {
1419 typedef typename
1420 add_const<typename add_volatile<_Tp>::type>::type type;
1421 };
1422
1423#if __cplusplus > 201103L
1424
1425#define __cpp_lib_transformation_trait_aliases 201304
1426
1427 /// Alias template for remove_const
1428 template<typename _Tp>
1429 using remove_const_t = typename remove_const<_Tp>::type;
1430
1431 /// Alias template for remove_volatile
1432 template<typename _Tp>
1433 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1434
1435 /// Alias template for remove_cv
1436 template<typename _Tp>
1437 using remove_cv_t = typename remove_cv<_Tp>::type;
1438
1439 /// Alias template for add_const
1440 template<typename _Tp>
1441 using add_const_t = typename add_const<_Tp>::type;
1442
1443 /// Alias template for add_volatile
1444 template<typename _Tp>
1445 using add_volatile_t = typename add_volatile<_Tp>::type;
1446
1447 /// Alias template for add_cv
1448 template<typename _Tp>
1449 using add_cv_t = typename add_cv<_Tp>::type;
1450#endif
1451
1452 // Reference transformations.
1453
1454 /// remove_reference
1455 template<typename _Tp>
1456 struct remove_reference
1457 { typedef _Tp type; };
1458
1459 template<typename _Tp>
1460 struct remove_reference<_Tp&>
1461 { typedef _Tp type; };
1462
1463 template<typename _Tp>
1464 struct remove_reference<_Tp&&>
1465 { typedef _Tp type; };
1466
1467 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1468 struct __add_lvalue_reference_helper
1469 { typedef _Tp type; };
1470
1471 template<typename _Tp>
1472 struct __add_lvalue_reference_helper<_Tp, true>
1473 { typedef _Tp& type; };
1474
1475 /// add_lvalue_reference
1476 template<typename _Tp>
1477 struct add_lvalue_reference
1478 : public __add_lvalue_reference_helper<_Tp>
1479 { };
1480
1481 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1482 struct __add_rvalue_reference_helper
1483 { typedef _Tp type; };
1484
1485 template<typename _Tp>
1486 struct __add_rvalue_reference_helper<_Tp, true>
1487 { typedef _Tp&& type; };
1488
1489 /// add_rvalue_reference
1490 template<typename _Tp>
1491 struct add_rvalue_reference
1492 : public __add_rvalue_reference_helper<_Tp>
1493 { };
1494
1495#if __cplusplus > 201103L
1496 /// Alias template for remove_reference
1497 template<typename _Tp>
1498 using remove_reference_t = typename remove_reference<_Tp>::type;
1499
1500 /// Alias template for add_lvalue_reference
1501 template<typename _Tp>
1502 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1503
1504 /// Alias template for add_rvalue_reference
1505 template<typename _Tp>
1506 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1507#endif
1508
1509 // Sign modifications.
1510
1511 // Utility for constructing identically cv-qualified types.
1512 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1513 struct __cv_selector;
1514
1515 template<typename _Unqualified>
1516 struct __cv_selector<_Unqualified, false, false>
1517 { typedef _Unqualified __type; };
1518
1519 template<typename _Unqualified>
1520 struct __cv_selector<_Unqualified, false, true>
1521 { typedef volatile _Unqualified __type; };
1522
1523 template<typename _Unqualified>
1524 struct __cv_selector<_Unqualified, true, false>
1525 { typedef const _Unqualified __type; };
1526
1527 template<typename _Unqualified>
1528 struct __cv_selector<_Unqualified, true, true>
1529 { typedef const volatile _Unqualified __type; };
1530
1531 template<typename _Qualified, typename _Unqualified,
1532 bool _IsConst = is_const<_Qualified>::value,
1533 bool _IsVol = is_volatile<_Qualified>::value>
1534 class __match_cv_qualifiers
1535 {
1536 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1537
1538 public:
1539 typedef typename __match::__type __type;
1540 };
1541
1542 // Utility for finding the unsigned versions of signed integral types.
1543 template<typename _Tp>
1544 struct __make_unsigned
1545 { typedef _Tp __type; };
1546
1547 template<>
1548 struct __make_unsigned<char>
1549 { typedef unsigned char __type; };
1550
1551 template<>
1552 struct __make_unsigned<signed char>
1553 { typedef unsigned char __type; };
1554
1555 template<>
1556 struct __make_unsigned<short>
1557 { typedef unsigned short __type; };
1558
1559 template<>
1560 struct __make_unsigned<int>
1561 { typedef unsigned int __type; };
1562
1563 template<>
1564 struct __make_unsigned<long>
1565 { typedef unsigned long __type; };
1566
1567 template<>
1568 struct __make_unsigned<long long>
1569 { typedef unsigned long long __type; };
1570
1571#if defined(__GLIBCXX_TYPE_INT_N_0)
1572 template<>
1573 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1574 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1575#endif
1576#if defined(__GLIBCXX_TYPE_INT_N_1)
1577 template<>
1578 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1579 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1580#endif
1581#if defined(__GLIBCXX_TYPE_INT_N_2)
1582 template<>
1583 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1584 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1585#endif
1586#if defined(__GLIBCXX_TYPE_INT_N_3)
1587 template<>
1588 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1589 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1590#endif
1591
1592 // Select between integral and enum: not possible to be both.
1593 template<typename _Tp,
1594 bool _IsInt = is_integral<_Tp>::value,
1595 bool _IsEnum = is_enum<_Tp>::value>
1596 class __make_unsigned_selector;
1597
1598 template<typename _Tp>
1599 class __make_unsigned_selector<_Tp, true, false>
1600 {
1601 using __unsigned_type
1602 = typename __make_unsigned<typename remove_cv<_Tp>::type>::__type;
1603
1604 public:
1605 using __type
1606 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1607 };
1608
1609 class __make_unsigned_selector_base
1610 {
1611 protected:
1612 template<typename...> struct _List { };
1613
1614 template<typename _Tp, typename... _Up>
1615 struct _List<_Tp, _Up...> : _List<_Up...>
1616 { static constexpr size_t __size = sizeof(_Tp); };
1617
1618 template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
1619 struct __select;
1620
1621 template<size_t _Sz, typename _Uint, typename... _UInts>
1622 struct __select<_Sz, _List<_Uint, _UInts...>, true>
1623 { using __type = _Uint; };
1624
1625 template<size_t _Sz, typename _Uint, typename... _UInts>
1626 struct __select<_Sz, _List<_Uint, _UInts...>, false>
1627 : __select<_Sz, _List<_UInts...>>
1628 { };
1629 };
1630
1631 // Choose unsigned integer type with the smallest rank and same size as _Tp
1632 template<typename _Tp>
1633 class __make_unsigned_selector<_Tp, false, true>
1634 : __make_unsigned_selector_base
1635 {
1636 // With -fshort-enums, an enum may be as small as a char.
1637 using _UInts = _List<unsigned char, unsigned short, unsigned int,
1638 unsigned long, unsigned long long>;
1639
1640 using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
1641
1642 public:
1643 using __type
1644 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1645 };
1646
1647 // wchar_t, char8_t, char16_t and char32_t are integral types but are
1648 // neither signed integer types nor unsigned integer types, so must be
1649 // transformed to the unsigned integer type with the smallest rank.
1650 // Use the partial specialization for enumeration types to do that.
1651#if defined(_GLIBCXX_USE_WCHAR_T)
1652 template<>
1653 struct __make_unsigned<wchar_t>
1654 {
1655 using __type
1656 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
1657 };
1658#endif
1659
1660#ifdef _GLIBCXX_USE_CHAR8_T
1661 template<>
1662 struct __make_unsigned<char8_t>
1663 {
1664 using __type
1665 = typename __make_unsigned_selector<char8_t, false, true>::__type;
1666 };
1667#endif
1668
1669 template<>
1670 struct __make_unsigned<char16_t>
1671 {
1672 using __type
1673 = typename __make_unsigned_selector<char16_t, false, true>::__type;
1674 };
1675
1676 template<>
1677 struct __make_unsigned<char32_t>
1678 {
1679 using __type
1680 = typename __make_unsigned_selector<char32_t, false, true>::__type;
1681 };
1682
1683 // Given an integral/enum type, return the corresponding unsigned
1684 // integer type.
1685 // Primary template.
1686 /// make_unsigned
1687 template<typename _Tp>
1688 struct make_unsigned
1689 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1690
1691 // Integral, but don't define.
1692 template<>
1693 struct make_unsigned<bool>;
1694
1695
1696 // Utility for finding the signed versions of unsigned integral types.
1697 template<typename _Tp>
1698 struct __make_signed
1699 { typedef _Tp __type; };
1700
1701 template<>
1702 struct __make_signed<char>
1703 { typedef signed char __type; };
1704
1705 template<>
1706 struct __make_signed<unsigned char>
1707 { typedef signed char __type; };
1708
1709 template<>
1710 struct __make_signed<unsigned short>
1711 { typedef signed short __type; };
1712
1713 template<>
1714 struct __make_signed<unsigned int>
1715 { typedef signed int __type; };
1716
1717 template<>
1718 struct __make_signed<unsigned long>
1719 { typedef signed long __type; };
1720
1721 template<>
1722 struct __make_signed<unsigned long long>
1723 { typedef signed long long __type; };
1724
1725#if defined(__GLIBCXX_TYPE_INT_N_0)
1726 template<>
1727 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1728 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1729#endif
1730#if defined(__GLIBCXX_TYPE_INT_N_1)
1731 template<>
1732 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1733 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1734#endif
1735#if defined(__GLIBCXX_TYPE_INT_N_2)
1736 template<>
1737 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1738 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1739#endif
1740#if defined(__GLIBCXX_TYPE_INT_N_3)
1741 template<>
1742 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1743 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1744#endif
1745
1746 // Select between integral and enum: not possible to be both.
1747 template<typename _Tp,
1748 bool _IsInt = is_integral<_Tp>::value,
1749 bool _IsEnum = is_enum<_Tp>::value>
1750 class __make_signed_selector;
1751
1752 template<typename _Tp>
1753 class __make_signed_selector<_Tp, true, false>
1754 {
1755 using __signed_type
1756 = typename __make_signed<typename remove_cv<_Tp>::type>::__type;
1757
1758 public:
1759 using __type
1760 = typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
1761 };
1762
1763 // Choose signed integer type with the smallest rank and same size as _Tp
1764 template<typename _Tp>
1765 class __make_signed_selector<_Tp, false, true>
1766 {
1767 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1768
1769 public:
1770 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1771 };
1772
1773 // wchar_t, char16_t and char32_t are integral types but are neither
1774 // signed integer types nor unsigned integer types, so must be
1775 // transformed to the signed integer type with the smallest rank.
1776 // Use the partial specialization for enumeration types to do that.
1777#if defined(_GLIBCXX_USE_WCHAR_T)
1778 template<>
1779 struct __make_signed<wchar_t>
1780 {
1781 using __type
1782 = typename __make_signed_selector<wchar_t, false, true>::__type;
1783 };
1784#endif
1785
1786#if defined(_GLIBCXX_USE_CHAR8_T)
1787 template<>
1788 struct __make_signed<char8_t>
1789 {
1790 using __type
1791 = typename __make_signed_selector<char8_t, false, true>::__type;
1792 };
1793#endif
1794
1795 template<>
1796 struct __make_signed<char16_t>
1797 {
1798 using __type
1799 = typename __make_signed_selector<char16_t, false, true>::__type;
1800 };
1801
1802 template<>
1803 struct __make_signed<char32_t>
1804 {
1805 using __type
1806 = typename __make_signed_selector<char32_t, false, true>::__type;
1807 };
1808
1809 // Given an integral/enum type, return the corresponding signed
1810 // integer type.
1811 // Primary template.
1812 /// make_signed
1813 template<typename _Tp>
1814 struct make_signed
1815 { typedef typename __make_signed_selector<_Tp>::__type type; };
1816
1817 // Integral, but don't define.
1818 template<>
1819 struct make_signed<bool>;
1820
1821#if __cplusplus > 201103L
1822 /// Alias template for make_signed
1823 template<typename _Tp>
1824 using make_signed_t = typename make_signed<_Tp>::type;
1825
1826 /// Alias template for make_unsigned
1827 template<typename _Tp>
1828 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1829#endif
1830
1831 // Array modifications.
1832
1833 /// remove_extent
1834 template<typename _Tp>
1835 struct remove_extent
1836 { typedef _Tp type; };
1837
1838 template<typename _Tp, std::size_t _Size>
1839 struct remove_extent<_Tp[_Size]>
1840 { typedef _Tp type; };
1841
1842 template<typename _Tp>
1843 struct remove_extent<_Tp[]>
1844 { typedef _Tp type; };
1845
1846 /// remove_all_extents
1847 template<typename _Tp>
1848 struct remove_all_extents
1849 { typedef _Tp type; };
1850
1851 template<typename _Tp, std::size_t _Size>
1852 struct remove_all_extents<_Tp[_Size]>
1853 { typedef typename remove_all_extents<_Tp>::type type; };
1854
1855 template<typename _Tp>
1856 struct remove_all_extents<_Tp[]>
1857 { typedef typename remove_all_extents<_Tp>::type type; };
1858
1859#if __cplusplus > 201103L
1860 /// Alias template for remove_extent
1861 template<typename _Tp>
1862 using remove_extent_t = typename remove_extent<_Tp>::type;
1863
1864 /// Alias template for remove_all_extents
1865 template<typename _Tp>
1866 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1867#endif
1868
1869 // Pointer modifications.
1870
1871 template<typename _Tp, typename>
1872 struct __remove_pointer_helper
1873 { typedef _Tp type; };
1874
1875 template<typename _Tp, typename _Up>
1876 struct __remove_pointer_helper<_Tp, _Up*>
1877 { typedef _Up type; };
1878
1879 /// remove_pointer
1880 template<typename _Tp>
1881 struct remove_pointer
1882 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1883 { };
1884
1885 /// add_pointer
1886 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1887 is_void<_Tp>>::value>
1888 struct __add_pointer_helper
1889 { typedef _Tp type; };
1890
1891 template<typename _Tp>
1892 struct __add_pointer_helper<_Tp, true>
1893 { typedef typename remove_reference<_Tp>::type* type; };
1894
1895 template<typename _Tp>
1896 struct add_pointer
1897 : public __add_pointer_helper<_Tp>
1898 { };
1899
1900#if __cplusplus > 201103L
1901 /// Alias template for remove_pointer
1902 template<typename _Tp>
1903 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1904
1905 /// Alias template for add_pointer
1906 template<typename _Tp>
1907 using add_pointer_t = typename add_pointer<_Tp>::type;
1908#endif
1909
1910 template<std::size_t _Len>
1911 struct __aligned_storage_msa
1912 {
1913 union __type
1914 {
1915 unsigned char __data[_Len];
1916 struct __attribute__((__aligned__)) { } __align;
1917 };
1918 };
1919
1920 /**
1921 * @brief Alignment type.
1922 *
1923 * The value of _Align is a default-alignment which shall be the
1924 * most stringent alignment requirement for any C++ object type
1925 * whose size is no greater than _Len (3.9). The member typedef
1926 * type shall be a POD type suitable for use as uninitialized
1927 * storage for any object whose size is at most _Len and whose
1928 * alignment is a divisor of _Align.
1929 */
1930 template<std::size_t _Len, std::size_t _Align =
1931 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1932 struct aligned_storage
1933 {
1934 union type
1935 {
1936 unsigned char __data[_Len];
1937 struct __attribute__((__aligned__((_Align)))) { } __align;
1938 };
1939 };
1940
1941 template <typename... _Types>
1942 struct __strictest_alignment
1943 {
1944 static const size_t _S_alignment = 0;
1945 static const size_t _S_size = 0;
1946 };
1947
1948 template <typename _Tp, typename... _Types>
1949 struct __strictest_alignment<_Tp, _Types...>
1950 {
1951 static const size_t _S_alignment =
1952 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1953 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1954 static const size_t _S_size =
1955 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1956 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
1957 };
1958
1959 /**
1960 * @brief Provide aligned storage for types.
1961 *
1962 * [meta.trans.other]
1963 *
1964 * Provides aligned storage for any of the provided types of at
1965 * least size _Len.
1966 *
1967 * @see aligned_storage
1968 */
1969 template <size_t _Len, typename... _Types>
1970 struct aligned_union
1971 {
1972 private:
1973 static_assert(sizeof...(_Types) != 0, "At least one type is required");
1974
1975 using __strictest = __strictest_alignment<_Types...>;
1976 static const size_t _S_len = _Len > __strictest::_S_size
1977 ? _Len : __strictest::_S_size;
1978 public:
1979 /// The value of the strictest alignment of _Types.
1980 static const size_t alignment_value = __strictest::_S_alignment;
1981 /// The storage.
1982 typedef typename aligned_storage<_S_len, alignment_value>::type type;
1983 };
1984
1985 template <size_t _Len, typename... _Types>
1986 const size_t aligned_union<_Len, _Types...>::alignment_value;
1987
1988 // Decay trait for arrays and functions, used for perfect forwarding
1989 // in make_pair, make_tuple, etc.
1990 template<typename _Up,
1991 bool _IsArray = is_array<_Up>::value,
1992 bool _IsFunction = is_function<_Up>::value>
1993 struct __decay_selector;
1994
1995 // NB: DR 705.
1996 template<typename _Up>
1997 struct __decay_selector<_Up, false, false>
1998 { typedef typename remove_cv<_Up>::type __type; };
1999
2000 template<typename _Up>
2001 struct __decay_selector<_Up, true, false>
2002 { typedef typename remove_extent<_Up>::type* __type; };
2003
2004 template<typename _Up>
2005 struct __decay_selector<_Up, false, true>
2006 { typedef typename add_pointer<_Up>::type __type; };
2007
2008 /// decay
2009 template<typename _Tp>
2010 class decay
2011 {
2012 typedef typename remove_reference<_Tp>::type __remove_type;
2013
2014 public:
2015 typedef typename __decay_selector<__remove_type>::__type type;
2016 };
2017
2018 template<typename _Tp>
2019 class reference_wrapper;
2020
2021 // Helper which adds a reference to a type when given a reference_wrapper
2022 template<typename _Tp>
2023 struct __strip_reference_wrapper
2024 {
2025 typedef _Tp __type;
2026 };
2027
2028 template<typename _Tp>
2029 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
2030 {
2031 typedef _Tp& __type;
2032 };
2033
2034 template<typename _Tp>
2035 struct __decay_and_strip
2036 {
2037 typedef typename __strip_reference_wrapper<
2038 typename decay<_Tp>::type>::__type __type;
2039 };
2040
2041
2042 // Primary template.
2043 /// Define a member typedef @c type only if a boolean constant is true.
2044 template<bool, typename _Tp = void>
2045 struct enable_if
2046 { };
2047
2048 // Partial specialization for true.
2049 template<typename _Tp>
2050 struct enable_if<true, _Tp>
2051 { typedef _Tp type; };
2052
2053 template<typename... _Cond>
2054 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
2055
2056 // Primary template.
2057 /// Define a member typedef @c type to one of two argument types.
2058 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2059 struct conditional
2060 { typedef _Iftrue type; };
2061
2062 // Partial specialization for false.
2063 template<typename _Iftrue, typename _Iffalse>
2064 struct conditional<false, _Iftrue, _Iffalse>
2065 { typedef _Iffalse type; };
2066
2067 /// common_type
2068 template<typename... _Tp>
2069 struct common_type;
2070
2071 // Sfinae-friendly common_type implementation:
2072
2073 struct __do_common_type_impl
2074 {
2075 template<typename _Tp, typename _Up>
2076 static __success_type<typename decay<decltype
2077 (true ? std::declval<_Tp>()
2078 : std::declval<_Up>())>::type> _S_test(int);
2079
2080 template<typename, typename>
2081 static __failure_type _S_test(...);
2082 };
2083
2084 template<typename _Tp, typename _Up>
2085 struct __common_type_impl
2086 : private __do_common_type_impl
2087 {
2088 typedef decltype(_S_test<_Tp, _Up>(0)) type;
2089 };
2090
2091 struct __do_member_type_wrapper
2092 {
2093 template<typename _Tp>
2094 static __success_type<typename _Tp::type> _S_test(int);
2095
2096 template<typename>
2097 static __failure_type _S_test(...);
2098 };
2099
2100 template<typename _Tp>
2101 struct __member_type_wrapper
2102 : private __do_member_type_wrapper
2103 {
2104 typedef decltype(_S_test<_Tp>(0)) type;
2105 };
2106
2107 template<typename _CTp, typename... _Args>
2108 struct __expanded_common_type_wrapper
2109 {
2110 typedef common_type<typename _CTp::type, _Args...> type;
2111 };
2112
2113 template<typename... _Args>
2114 struct __expanded_common_type_wrapper<__failure_type, _Args...>
2115 { typedef __failure_type type; };
2116
2117 template<>
2118 struct common_type<>
2119 { };
2120
2121 template<typename _Tp>
2122 struct common_type<_Tp>
2123 : common_type<_Tp, _Tp>
2124 { };
2125
2126 template<typename _Tp, typename _Up>
2127 struct common_type<_Tp, _Up>
2128 : public __common_type_impl<_Tp, _Up>::type
2129 { };
2130
2131 template<typename _Tp, typename _Up, typename... _Vp>
2132 struct common_type<_Tp, _Up, _Vp...>
2133 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
2134 common_type<_Tp, _Up>>::type, _Vp...>::type
2135 { };
2136
2137 template<typename _Tp, bool = is_enum<_Tp>::value>
2138 struct __underlying_type_impl
2139 {
2140 using type = __underlying_type(_Tp);
2141 };
2142
2143 template<typename _Tp>
2144 struct __underlying_type_impl<_Tp, false>
2145 { };
2146
2147 /// The underlying type of an enum.
2148 template<typename _Tp>
2149 struct underlying_type
2150 : public __underlying_type_impl<_Tp>
2151 { };
2152
2153 template<typename _Tp>
2154 struct __declval_protector
2155 {
2156 static const bool __stop = false;
2157 };
2158
2159 template<typename _Tp>
2160 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2161 {
2162 static_assert(__declval_protector<_Tp>::__stop,
2163 "declval() must not be used!");
2164 return __declval<_Tp>(0);
2165 }
2166
2167 // __remove_cvref_t (std::remove_cvref_t for C++11).
2168 template<typename _Tp>
2169 using __remove_cvref_t
2170 = typename remove_cv<typename remove_reference<_Tp>::type>::type;
2171
2172 /// result_of
2173 template<typename _Signature>
2174 class result_of;
2175
2176 // Sfinae-friendly result_of implementation:
2177
2178#define __cpp_lib_result_of_sfinae 201210
2179
2180 struct __invoke_memfun_ref { };
2181 struct __invoke_memfun_deref { };
2182 struct __invoke_memobj_ref { };
2183 struct __invoke_memobj_deref { };
2184 struct __invoke_other { };
2185
2186 // Associate a tag type with a specialization of __success_type.
2187 template<typename _Tp, typename _Tag>
2188 struct __result_of_success : __success_type<_Tp>
2189 { using __invoke_type = _Tag; };
2190
2191 // [func.require] paragraph 1 bullet 1:
2192 struct __result_of_memfun_ref_impl
2193 {
2194 template<typename _Fp, typename _Tp1, typename... _Args>
2195 static __result_of_success<decltype(
2196 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2197 ), __invoke_memfun_ref> _S_test(int);
2198
2199 template<typename...>
2200 static __failure_type _S_test(...);
2201 };
2202
2203 template<typename _MemPtr, typename _Arg, typename... _Args>
2204 struct __result_of_memfun_ref
2205 : private __result_of_memfun_ref_impl
2206 {
2207 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2208 };
2209
2210 // [func.require] paragraph 1 bullet 2:
2211 struct __result_of_memfun_deref_impl
2212 {
2213 template<typename _Fp, typename _Tp1, typename... _Args>
2214 static __result_of_success<decltype(
2215 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2216 ), __invoke_memfun_deref> _S_test(int);
2217
2218 template<typename...>
2219 static __failure_type _S_test(...);
2220 };
2221
2222 template<typename _MemPtr, typename _Arg, typename... _Args>
2223 struct __result_of_memfun_deref
2224 : private __result_of_memfun_deref_impl
2225 {
2226 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2227 };
2228
2229 // [func.require] paragraph 1 bullet 3:
2230 struct __result_of_memobj_ref_impl
2231 {
2232 template<typename _Fp, typename _Tp1>
2233 static __result_of_success<decltype(
2234 std::declval<_Tp1>().*std::declval<_Fp>()
2235 ), __invoke_memobj_ref> _S_test(int);
2236
2237 template<typename, typename>
2238 static __failure_type _S_test(...);
2239 };
2240
2241 template<typename _MemPtr, typename _Arg>
2242 struct __result_of_memobj_ref
2243 : private __result_of_memobj_ref_impl
2244 {
2245 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2246 };
2247
2248 // [func.require] paragraph 1 bullet 4:
2249 struct __result_of_memobj_deref_impl
2250 {
2251 template<typename _Fp, typename _Tp1>
2252 static __result_of_success<decltype(
2253 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2254 ), __invoke_memobj_deref> _S_test(int);
2255
2256 template<typename, typename>
2257 static __failure_type _S_test(...);
2258 };
2259
2260 template<typename _MemPtr, typename _Arg>
2261 struct __result_of_memobj_deref
2262 : private __result_of_memobj_deref_impl
2263 {
2264 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2265 };
2266
2267 template<typename _MemPtr, typename _Arg>
2268 struct __result_of_memobj;
2269
2270 template<typename _Res, typename _Class, typename _Arg>
2271 struct __result_of_memobj<_Res _Class::*, _Arg>
2272 {
2273 typedef __remove_cvref_t<_Arg> _Argval;
2274 typedef _Res _Class::* _MemPtr;
2275 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2276 is_base_of<_Class, _Argval>>::value,
2277 __result_of_memobj_ref<_MemPtr, _Arg>,
2278 __result_of_memobj_deref<_MemPtr, _Arg>
2279 >::type::type type;
2280 };
2281
2282 template<typename _MemPtr, typename _Arg, typename... _Args>
2283 struct __result_of_memfun;
2284
2285 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2286 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2287 {
2288 typedef typename remove_reference<_Arg>::type _Argval;
2289 typedef _Res _Class::* _MemPtr;
2290 typedef typename conditional<is_base_of<_Class, _Argval>::value,
2291 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2292 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2293 >::type::type type;
2294 };
2295
2296 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2297 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2298 // as the object expression
2299
2300 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2301 template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
2302 struct __inv_unwrap
2303 {
2304 using type = _Tp;
2305 };
2306
2307 template<typename _Tp, typename _Up>
2308 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2309 {
2310 using type = _Up&;
2311 };
2312
2313 template<bool, bool, typename _Functor, typename... _ArgTypes>
2314 struct __result_of_impl
2315 {
2316 typedef __failure_type type;
2317 };
2318
2319 template<typename _MemPtr, typename _Arg>
2320 struct __result_of_impl<true, false, _MemPtr, _Arg>
2321 : public __result_of_memobj<typename decay<_MemPtr>::type,
2322 typename __inv_unwrap<_Arg>::type>
2323 { };
2324
2325 template<typename _MemPtr, typename _Arg, typename... _Args>
2326 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2327 : public __result_of_memfun<typename decay<_MemPtr>::type,
2328 typename __inv_unwrap<_Arg>::type, _Args...>
2329 { };
2330
2331 // [func.require] paragraph 1 bullet 5:
2332 struct __result_of_other_impl
2333 {
2334 template<typename _Fn, typename... _Args>
2335 static __result_of_success<decltype(
2336 std::declval<_Fn>()(std::declval<_Args>()...)
2337 ), __invoke_other> _S_test(int);
2338
2339 template<typename...>
2340 static __failure_type _S_test(...);
2341 };
2342
2343 template<typename _Functor, typename... _ArgTypes>
2344 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2345 : private __result_of_other_impl
2346 {
2347 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2348 };
2349
2350 // __invoke_result (std::invoke_result for C++11)
2351 template<typename _Functor, typename... _ArgTypes>
2352 struct __invoke_result
2353 : public __result_of_impl<
2354 is_member_object_pointer<
2355 typename remove_reference<_Functor>::type
2356 >::value,
2357 is_member_function_pointer<
2358 typename remove_reference<_Functor>::type
2359 >::value,
2360 _Functor, _ArgTypes...
2361 >::type
2362 { };
2363
2364 template<typename _Functor, typename... _ArgTypes>
2365 struct result_of<_Functor(_ArgTypes...)>
2366 : public __invoke_result<_Functor, _ArgTypes...>
2367 { };
2368
2369#if __cplusplus >= 201402L
2370 /// Alias template for aligned_storage
2371 template<size_t _Len, size_t _Align =
2372 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2373 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2374
2375 template <size_t _Len, typename... _Types>
2376 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2377
2378 /// Alias template for decay
2379 template<typename _Tp>
2380 using decay_t = typename decay<_Tp>::type;
2381
2382 /// Alias template for enable_if
2383 template<bool _Cond, typename _Tp = void>
2384 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2385
2386 /// Alias template for conditional
2387 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2388 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2389
2390 /// Alias template for common_type
2391 template<typename... _Tp>
2392 using common_type_t = typename common_type<_Tp...>::type;
2393
2394 /// Alias template for underlying_type
2395 template<typename _Tp>
2396 using underlying_type_t = typename underlying_type<_Tp>::type;
2397
2398 /// Alias template for result_of
2399 template<typename _Tp>
2400 using result_of_t = typename result_of<_Tp>::type;
2401#endif // C++14
2402
2403 // __enable_if_t (std::enable_if_t for C++11)
2404 template<bool _Cond, typename _Tp = void>
2405 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2406
2407 // __void_t (std::void_t for C++11)
2408 template<typename...> using __void_t = void;
2409
2410#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2411#define __cpp_lib_void_t 201411
2412 /// A metafunction that always yields void, used for detecting valid types.
2413 template<typename...> using void_t = void;
2414#endif
2415
2416 /// Implementation of the detection idiom (negative case).
2417 template<typename _Default, typename _AlwaysVoid,
2418 template<typename...> class _Op, typename... _Args>
2419 struct __detector
2420 {
2421 using value_t = false_type;
2422 using type = _Default;
2423 };
2424
2425 /// Implementation of the detection idiom (positive case).
2426 template<typename _Default, template<typename...> class _Op,
2427 typename... _Args>
2428 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2429 {
2430 using value_t = true_type;
2431 using type = _Op<_Args...>;
2432 };
2433
2434 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2435 template<typename _Default, template<typename...> class _Op,
2436 typename... _Args>
2437 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2438
2439 // _Op<_Args...> if that is a valid type, otherwise _Default.
2440 template<typename _Default, template<typename...> class _Op,
2441 typename... _Args>
2442 using __detected_or_t
2443 = typename __detected_or<_Default, _Op, _Args...>::type;
2444
2445 /// @} group metaprogramming
2446
2447 /**
2448 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2449 * member type _NTYPE.
2450 */
2451#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2452 template<typename _Tp, typename = __void_t<>> \
2453 struct __has_##_NTYPE \
2454 : false_type \
2455 { }; \
2456 template<typename _Tp> \
2457 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2458 : true_type \
2459 { };
2460
2461 template <typename _Tp>
2462 struct __is_swappable;
2463
2464 template <typename _Tp>
2465 struct __is_nothrow_swappable;
2466
2467 template<typename... _Elements>
2468 class tuple;
2469
2470 template<typename>
2471 struct __is_tuple_like_impl : false_type
2472 { };
2473
2474 template<typename... _Tps>
2475 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2476 { };
2477
2478 // Internal type trait that allows us to sfinae-protect tuple_cat.
2479 template<typename _Tp>
2480 struct __is_tuple_like
2481 : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
2482 { };
2483
2484 template<typename _Tp>
2485 inline
2486 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2487 is_move_constructible<_Tp>,
2488 is_move_assignable<_Tp>>::value>::type
2489 swap(_Tp&, _Tp&)
2490 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2491 is_nothrow_move_assignable<_Tp>>::value);
2492
2493 template<typename _Tp, size_t _Nm>
2494 inline
2495 typename enable_if<__is_swappable<_Tp>::value>::type
2496 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2497 noexcept(__is_nothrow_swappable<_Tp>::value);
2498
2499 namespace __swappable_details {
2500 using std::swap;
2501
2502 struct __do_is_swappable_impl
2503 {
2504 template<typename _Tp, typename
2505 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2506 static true_type __test(int);
2507
2508 template<typename>
2509 static false_type __test(...);
2510 };
2511
2512 struct __do_is_nothrow_swappable_impl
2513 {
2514 template<typename _Tp>
2515 static __bool_constant<
2516 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2517 > __test(int);
2518
2519 template<typename>
2520 static false_type __test(...);
2521 };
2522
2523 } // namespace __swappable_details
2524
2525 template<typename _Tp>
2526 struct __is_swappable_impl
2527 : public __swappable_details::__do_is_swappable_impl
2528 {
2529 typedef decltype(__test<_Tp>(0)) type;
2530 };
2531
2532 template<typename _Tp>
2533 struct __is_nothrow_swappable_impl
2534 : public __swappable_details::__do_is_nothrow_swappable_impl
2535 {
2536 typedef decltype(__test<_Tp>(0)) type;
2537 };
2538
2539 template<typename _Tp>
2540 struct __is_swappable
2541 : public __is_swappable_impl<_Tp>::type
2542 { };
2543
2544 template<typename _Tp>
2545 struct __is_nothrow_swappable
2546 : public __is_nothrow_swappable_impl<_Tp>::type
2547 { };
2548
2549#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2550#define __cpp_lib_is_swappable 201603
2551 /// Metafunctions used for detecting swappable types: p0185r1
2552
2553 /// is_swappable
2554 template<typename _Tp>
2555 struct is_swappable
2556 : public __is_swappable_impl<_Tp>::type
2557 { };
2558
2559 /// is_nothrow_swappable
2560 template<typename _Tp>
2561 struct is_nothrow_swappable
2562 : public __is_nothrow_swappable_impl<_Tp>::type
2563 { };
2564
2565#if __cplusplus >= 201402L
2566 /// is_swappable_v
2567 template<typename _Tp>
2568 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2569 is_swappable<_Tp>::value;
2570
2571 /// is_nothrow_swappable_v
2572 template<typename _Tp>
2573 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2574 is_nothrow_swappable<_Tp>::value;
2575#endif // __cplusplus >= 201402L
2576
2577 namespace __swappable_with_details {
2578 using std::swap;
2579
2580 struct __do_is_swappable_with_impl
2581 {
2582 template<typename _Tp, typename _Up, typename
2583 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2584 typename
2585 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2586 static true_type __test(int);
2587
2588 template<typename, typename>
2589 static false_type __test(...);
2590 };
2591
2592 struct __do_is_nothrow_swappable_with_impl
2593 {
2594 template<typename _Tp, typename _Up>
2595 static __bool_constant<
2596 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2597 &&
2598 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2599 > __test(int);
2600
2601 template<typename, typename>
2602 static false_type __test(...);
2603 };
2604
2605 } // namespace __swappable_with_details
2606
2607 template<typename _Tp, typename _Up>
2608 struct __is_swappable_with_impl
2609 : public __swappable_with_details::__do_is_swappable_with_impl
2610 {
2611 typedef decltype(__test<_Tp, _Up>(0)) type;
2612 };
2613
2614 // Optimization for the homogenous lvalue case, not required:
2615 template<typename _Tp>
2616 struct __is_swappable_with_impl<_Tp&, _Tp&>
2617 : public __swappable_details::__do_is_swappable_impl
2618 {
2619 typedef decltype(__test<_Tp&>(0)) type;
2620 };
2621
2622 template<typename _Tp, typename _Up>
2623 struct __is_nothrow_swappable_with_impl
2624 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2625 {
2626 typedef decltype(__test<_Tp, _Up>(0)) type;
2627 };
2628
2629 // Optimization for the homogenous lvalue case, not required:
2630 template<typename _Tp>
2631 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2632 : public __swappable_details::__do_is_nothrow_swappable_impl
2633 {
2634 typedef decltype(__test<_Tp&>(0)) type;
2635 };
2636
2637 /// is_swappable_with
2638 template<typename _Tp, typename _Up>
2639 struct is_swappable_with
2640 : public __is_swappable_with_impl<_Tp, _Up>::type
2641 { };
2642
2643 /// is_nothrow_swappable_with
2644 template<typename _Tp, typename _Up>
2645 struct is_nothrow_swappable_with
2646 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2647 { };
2648
2649#if __cplusplus >= 201402L
2650 /// is_swappable_with_v
2651 template<typename _Tp, typename _Up>
2652 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2653 is_swappable_with<_Tp, _Up>::value;
2654
2655 /// is_nothrow_swappable_with_v
2656 template<typename _Tp, typename _Up>
2657 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2658 is_nothrow_swappable_with<_Tp, _Up>::value;
2659#endif // __cplusplus >= 201402L
2660
2661#endif// c++1z or gnu++11
2662
2663 // __is_invocable (std::is_invocable for C++11)
2664
2665 // The primary template is used for invalid INVOKE expressions.
2666 template<typename _Result, typename _Ret,
2667 bool = is_void<_Ret>::value, typename = void>
2668 struct __is_invocable_impl : false_type { };
2669
2670 // Used for valid INVOKE and INVOKE<void> expressions.
2671 template<typename _Result, typename _Ret>
2672 struct __is_invocable_impl<_Result, _Ret,
2673 /* is_void<_Ret> = */ true,
2674 __void_t<typename _Result::type>>
2675 : true_type
2676 { };
2677
2678#pragma GCC diagnostic push
2679#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
2680 // Used for INVOKE<R> expressions to check the implicit conversion to R.
2681 template<typename _Result, typename _Ret>
2682 struct __is_invocable_impl<_Result, _Ret,
2683 /* is_void<_Ret> = */ false,
2684 __void_t<typename _Result::type>>
2685 {
2686 private:
2687 // The type of the INVOKE expression.
2688 // Unlike declval, this doesn't add_rvalue_reference.
2689 static typename _Result::type _S_get();
2690
2691 template<typename _Tp>
2692 static void _S_conv(_Tp);
2693
2694 // This overload is viable if INVOKE(f, args...) can convert to _Tp.
2695 template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))>
2696 static true_type
2697 _S_test(int);
2698
2699 template<typename _Tp>
2700 static false_type
2701 _S_test(...);
2702
2703 public:
2704 using type = decltype(_S_test<_Ret>(1));
2705 };
2706#pragma GCC diagnostic pop
2707
2708 template<typename _Fn, typename... _ArgTypes>
2709 struct __is_invocable
2710 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2711 { };
2712
2713 template<typename _Fn, typename _Tp, typename... _Args>
2714 constexpr bool __call_is_nt(__invoke_memfun_ref)
2715 {
2716 using _Up = typename __inv_unwrap<_Tp>::type;
2717 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2718 std::declval<_Args>()...));
2719 }
2720
2721 template<typename _Fn, typename _Tp, typename... _Args>
2722 constexpr bool __call_is_nt(__invoke_memfun_deref)
2723 {
2724 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2725 std::declval<_Args>()...));
2726 }
2727
2728 template<typename _Fn, typename _Tp>
2729 constexpr bool __call_is_nt(__invoke_memobj_ref)
2730 {
2731 using _Up = typename __inv_unwrap<_Tp>::type;
2732 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2733 }
2734
2735 template<typename _Fn, typename _Tp>
2736 constexpr bool __call_is_nt(__invoke_memobj_deref)
2737 {
2738 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2739 }
2740
2741 template<typename _Fn, typename... _Args>
2742 constexpr bool __call_is_nt(__invoke_other)
2743 {
2744 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2745 }
2746
2747 template<typename _Result, typename _Fn, typename... _Args>
2748 struct __call_is_nothrow
2749 : __bool_constant<
2750 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2751 >
2752 { };
2753
2754 template<typename _Fn, typename... _Args>
2755 using __call_is_nothrow_
2756 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2757
2758 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2759 template<typename _Fn, typename... _Args>
2760 struct __is_nothrow_invocable
2761 : __and_<__is_invocable<_Fn, _Args...>,
2762 __call_is_nothrow_<_Fn, _Args...>>::type
2763 { };
2764
2765 struct __nonesuch {
2766 __nonesuch() = delete;
2767 ~__nonesuch() = delete;
2768 __nonesuch(__nonesuch const&) = delete;
2769 void operator=(__nonesuch const&) = delete;
2770 };
2771
2772#if __cplusplus >= 201703L
2773# define __cpp_lib_is_invocable 201703
2774
2775 /// std::invoke_result
2776 template<typename _Functor, typename... _ArgTypes>
2777 struct invoke_result
2778 : public __invoke_result<_Functor, _ArgTypes...>
2779 { };
2780
2781 /// std::invoke_result_t
2782 template<typename _Fn, typename... _Args>
2783 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2784
2785 /// std::is_invocable
2786 template<typename _Fn, typename... _ArgTypes>
2787 struct is_invocable
2788 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2789 { };
2790
2791 /// std::is_invocable_r
2792 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2793 struct is_invocable_r
2794 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2795 { };
2796
2797 /// std::is_nothrow_invocable
2798 template<typename _Fn, typename... _ArgTypes>
2799 struct is_nothrow_invocable
2800 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2801 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2802 { };
2803
2804 template<typename _Result, typename _Ret, typename = void>
2805 struct __is_nt_invocable_impl : false_type { };
2806
2807 template<typename _Result, typename _Ret>
2808 struct __is_nt_invocable_impl<_Result, _Ret,
2809 __void_t<typename _Result::type>>
2810 : __or_<is_void<_Ret>,
2811 __and_<is_convertible<typename _Result::type, _Ret>,
2812 is_nothrow_constructible<_Ret, typename _Result::type>>>
2813 { };
2814
2815 /// std::is_nothrow_invocable_r
2816 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2817 struct is_nothrow_invocable_r
2818 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2819 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2820 { };
2821
2822 /// std::is_invocable_v
2823 template<typename _Fn, typename... _Args>
2824 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2825
2826 /// std::is_nothrow_invocable_v
2827 template<typename _Fn, typename... _Args>
2828 inline constexpr bool is_nothrow_invocable_v
2829 = is_nothrow_invocable<_Fn, _Args...>::value;
2830
2831 /// std::is_invocable_r_v
2832 template<typename _Fn, typename... _Args>
2833 inline constexpr bool is_invocable_r_v
2834 = is_invocable_r<_Fn, _Args...>::value;
2835
2836 /// std::is_nothrow_invocable_r_v
2837 template<typename _Fn, typename... _Args>
2838 inline constexpr bool is_nothrow_invocable_r_v
2839 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2840#endif // C++17
2841
2842#if __cplusplus >= 201703L
2843# define __cpp_lib_type_trait_variable_templates 201510L
2844template <typename _Tp>
2845 inline constexpr bool is_void_v = is_void<_Tp>::value;
2846template <typename _Tp>
2847 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2848template <typename _Tp>
2849 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2850template <typename _Tp>
2851 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2852template <typename _Tp>
2853 inline constexpr bool is_array_v = is_array<_Tp>::value;
2854template <typename _Tp>
2855 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2856template <typename _Tp>
2857 inline constexpr bool is_lvalue_reference_v =
2858 is_lvalue_reference<_Tp>::value;
2859template <typename _Tp>
2860 inline constexpr bool is_rvalue_reference_v =
2861 is_rvalue_reference<_Tp>::value;
2862template <typename _Tp>
2863 inline constexpr bool is_member_object_pointer_v =
2864 is_member_object_pointer<_Tp>::value;
2865template <typename _Tp>
2866 inline constexpr bool is_member_function_pointer_v =
2867 is_member_function_pointer<_Tp>::value;
2868template <typename _Tp>
2869 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2870template <typename _Tp>
2871 inline constexpr bool is_union_v = is_union<_Tp>::value;
2872template <typename _Tp>
2873 inline constexpr bool is_class_v = is_class<_Tp>::value;
2874template <typename _Tp>
2875 inline constexpr bool is_function_v = is_function<_Tp>::value;
2876template <typename _Tp>
2877 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2878template <typename _Tp>
2879 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2880template <typename _Tp>
2881 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2882template <typename _Tp>
2883 inline constexpr bool is_object_v = is_object<_Tp>::value;
2884template <typename _Tp>
2885 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2886template <typename _Tp>
2887 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2888template <typename _Tp>
2889 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2890template <typename _Tp>
2891 inline constexpr bool is_const_v = is_const<_Tp>::value;
2892template <typename _Tp>
2893 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2894template <typename _Tp>
2895 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2896template <typename _Tp>
2897 inline constexpr bool is_trivially_copyable_v =
2898 is_trivially_copyable<_Tp>::value;
2899template <typename _Tp>
2900 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2901template <typename _Tp>
2902 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2903template <typename _Tp>
2904 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2905template <typename _Tp>
2906 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2907template <typename _Tp>
2908 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2909template <typename _Tp>
2910 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2911template <typename _Tp>
2912 inline constexpr bool is_final_v = is_final<_Tp>::value;
2913template <typename _Tp>
2914 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2915template <typename _Tp>
2916 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2917template <typename _Tp, typename... _Args>
2918 inline constexpr bool is_constructible_v =
2919 is_constructible<_Tp, _Args...>::value;
2920template <typename _Tp>
2921 inline constexpr bool is_default_constructible_v =
2922 is_default_constructible<_Tp>::value;
2923template <typename _Tp>
2924 inline constexpr bool is_copy_constructible_v =
2925 is_copy_constructible<_Tp>::value;
2926template <typename _Tp>
2927 inline constexpr bool is_move_constructible_v =
2928 is_move_constructible<_Tp>::value;
2929template <typename _Tp, typename _Up>
2930 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2931template <typename _Tp>
2932 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2933template <typename _Tp>
2934 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2935template <typename _Tp>
2936 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2937template <typename _Tp, typename... _Args>
2938 inline constexpr bool is_trivially_constructible_v =
2939 is_trivially_constructible<_Tp, _Args...>::value;
2940template <typename _Tp>
2941 inline constexpr bool is_trivially_default_constructible_v =
2942 is_trivially_default_constructible<_Tp>::value;
2943template <typename _Tp>
2944 inline constexpr bool is_trivially_copy_constructible_v =
2945 is_trivially_copy_constructible<_Tp>::value;
2946template <typename _Tp>
2947 inline constexpr bool is_trivially_move_constructible_v =
2948 is_trivially_move_constructible<_Tp>::value;
2949template <typename _Tp, typename _Up>
2950 inline constexpr bool is_trivially_assignable_v =
2951 is_trivially_assignable<_Tp, _Up>::value;
2952template <typename _Tp>
2953 inline constexpr bool is_trivially_copy_assignable_v =
2954 is_trivially_copy_assignable<_Tp>::value;
2955template <typename _Tp>
2956 inline constexpr bool is_trivially_move_assignable_v =
2957 is_trivially_move_assignable<_Tp>::value;
2958template <typename _Tp>
2959 inline constexpr bool is_trivially_destructible_v =
2960 is_trivially_destructible<_Tp>::value;
2961template <typename _Tp, typename... _Args>
2962 inline constexpr bool is_nothrow_constructible_v =
2963 is_nothrow_constructible<_Tp, _Args...>::value;
2964template <typename _Tp>
2965 inline constexpr bool is_nothrow_default_constructible_v =
2966 is_nothrow_default_constructible<_Tp>::value;
2967template <typename _Tp>
2968 inline constexpr bool is_nothrow_copy_constructible_v =
2969 is_nothrow_copy_constructible<_Tp>::value;
2970template <typename _Tp>
2971 inline constexpr bool is_nothrow_move_constructible_v =
2972 is_nothrow_move_constructible<_Tp>::value;
2973template <typename _Tp, typename _Up>
2974 inline constexpr bool is_nothrow_assignable_v =
2975 is_nothrow_assignable<_Tp, _Up>::value;
2976template <typename _Tp>
2977 inline constexpr bool is_nothrow_copy_assignable_v =
2978 is_nothrow_copy_assignable<_Tp>::value;
2979template <typename _Tp>
2980 inline constexpr bool is_nothrow_move_assignable_v =
2981 is_nothrow_move_assignable<_Tp>::value;
2982template <typename _Tp>
2983 inline constexpr bool is_nothrow_destructible_v =
2984 is_nothrow_destructible<_Tp>::value;
2985template <typename _Tp>
2986 inline constexpr bool has_virtual_destructor_v =
2987 has_virtual_destructor<_Tp>::value;
2988template <typename _Tp>
2989 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2990template <typename _Tp>
2991 inline constexpr size_t rank_v = rank<_Tp>::value;
2992template <typename _Tp, unsigned _Idx = 0>
2993 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2994template <typename _Tp, typename _Up>
2995 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2996template <typename _Base, typename _Derived>
2997 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2998template <typename _From, typename _To>
2999 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
3000
3001#ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
3002# define __cpp_lib_has_unique_object_representations 201606
3003 /// has_unique_object_representations
3004 template<typename _Tp>
3005 struct has_unique_object_representations
3006 : bool_constant<__has_unique_object_representations(
3007 remove_cv_t<remove_all_extents_t<_Tp>>
3008 )>
3009 { };
3010
3011 template<typename _Tp>
3012 inline constexpr bool has_unique_object_representations_v
3013 = has_unique_object_representations<_Tp>::value;
3014#endif
3015
3016#ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
3017# define __cpp_lib_is_aggregate 201703
3018 /// is_aggregate
3019 template<typename _Tp>
3020 struct is_aggregate
3021 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
3022
3023 /// is_aggregate_v
3024 template<typename _Tp>
3025 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
3026#endif
3027#endif // C++17
3028
3029#if __cplusplus > 201703L
3030 /// Remove references and cv-qualifiers.
3031 template<typename _Tp>
3032 struct remove_cvref
3033 {
3034 using type = __remove_cvref_t<_Tp>;
3035 };
3036
3037 template<typename _Tp>
3038 using remove_cvref_t = __remove_cvref_t<_Tp>;
3039
3040 /// Identity metafunction.
3041 template<typename _Tp>
3042 struct type_identity { using type = _Tp; };
3043
3044 template<typename _Tp>
3045 using type_identity_t = typename type_identity<_Tp>::type;
3046
3047 /// Unwrap a reference_wrapper
3048 template<typename _Tp>
3049 struct unwrap_reference { using type = _Tp; };
3050
3051 template<typename _Tp>
3052 struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; };
3053
3054 template<typename _Tp>
3055 using unwrap_reference_t = typename unwrap_reference<_Tp>::type;
3056
3057 /// Decay type and if it's a reference_wrapper, unwrap it
3058 template<typename _Tp>
3059 struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; };
3060
3061 template<typename _Tp>
3062 using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
3063
3064#define __cpp_lib_bounded_array_traits 201902L
3065
3066 /// True for a type that is an array of known bound.
3067 template<typename _Tp>
3068 struct is_bounded_array
3069 : public __is_array_known_bounds<_Tp>
3070 { };
3071
3072 /// True for a type that is an array of unknown bound.
3073 template<typename _Tp>
3074 struct is_unbounded_array
3075 : public __is_array_unknown_bounds<_Tp>
3076 { };
3077
3078 template<typename _Tp>
3079 inline constexpr bool is_bounded_array_v
3080 = is_bounded_array<_Tp>::value;
3081
3082 template<typename _Tp>
3083 inline constexpr bool is_unbounded_array_v
3084 = is_unbounded_array<_Tp>::value;
3085
3086#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
3087
3088#define __cpp_lib_is_constant_evaluated 201811L
3089
3090 constexpr inline bool
3091 is_constant_evaluated() noexcept
3092 { return __builtin_is_constant_evaluated(); }
3093#endif
3094
3095#endif // C++2a
3096
3097_GLIBCXX_END_NAMESPACE_VERSION
3098} // namespace std
3099
3100#endif // C++11
3101
3102#endif // _GLIBCXX_TYPE_TRAITS
3103