libstdc++
type_traits
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1// C++11 <type_traits> -*- C++ -*-
2
3// Copyright (C) 2007-2018 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#define __cpp_lib_logical_traits 201510
148
149 template<typename... _Bn>
150 struct conjunction
151 : __and_<_Bn...>
152 { };
153
154 template<typename... _Bn>
155 struct disjunction
156 : __or_<_Bn...>
157 { };
158
159 template<typename _Pp>
160 struct negation
161 : __not_<_Pp>
162 { };
163
164 template<typename... _Bn>
165 inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
166
167 template<typename... _Bn>
168 inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
169
170 template<typename _Pp>
171 inline constexpr bool negation_v = negation<_Pp>::value;
172
173#endif // C++17
174
175 // For several sfinae-friendly trait implementations we transport both the
176 // result information (as the member type) and the failure information (no
177 // member type). This is very similar to std::enable_if, but we cannot use
178 // them, because we need to derive from them as an implementation detail.
179
180 template<typename _Tp>
181 struct __success_type
182 { typedef _Tp type; };
183
184 struct __failure_type
185 { };
186
187 // Primary type categories.
188
189 template<typename>
190 struct remove_cv;
191
192 template<typename>
193 struct __is_void_helper
194 : public false_type { };
195
196 template<>
197 struct __is_void_helper<void>
198 : public true_type { };
199
200 /// is_void
201 template<typename _Tp>
202 struct is_void
203 : public __is_void_helper<typename remove_cv<_Tp>::type>::type
204 { };
205
206 template<typename>
207 struct __is_integral_helper
208 : public false_type { };
209
210 template<>
211 struct __is_integral_helper<bool>
212 : public true_type { };
213
214 template<>
215 struct __is_integral_helper<char>
216 : public true_type { };
217
218 template<>
219 struct __is_integral_helper<signed char>
220 : public true_type { };
221
222 template<>
223 struct __is_integral_helper<unsigned char>
224 : public true_type { };
225
226#ifdef _GLIBCXX_USE_WCHAR_T
227 template<>
228 struct __is_integral_helper<wchar_t>
229 : public true_type { };
230#endif
231
232 template<>
233 struct __is_integral_helper<char16_t>
234 : public true_type { };
235
236 template<>
237 struct __is_integral_helper<char32_t>
238 : public true_type { };
239
240 template<>
241 struct __is_integral_helper<short>
242 : public true_type { };
243
244 template<>
245 struct __is_integral_helper<unsigned short>
246 : public true_type { };
247
248 template<>
249 struct __is_integral_helper<int>
250 : public true_type { };
251
252 template<>
253 struct __is_integral_helper<unsigned int>
254 : public true_type { };
255
256 template<>
257 struct __is_integral_helper<long>
258 : public true_type { };
259
260 template<>
261 struct __is_integral_helper<unsigned long>
262 : public true_type { };
263
264 template<>
265 struct __is_integral_helper<long long>
266 : public true_type { };
267
268 template<>
269 struct __is_integral_helper<unsigned long long>
270 : public true_type { };
271
272 // Conditionalizing on __STRICT_ANSI__ here will break any port that
273 // uses one of these types for size_t.
274#if defined(__GLIBCXX_TYPE_INT_N_0)
275 template<>
276 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
277 : public true_type { };
278
279 template<>
280 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
281 : public true_type { };
282#endif
283#if defined(__GLIBCXX_TYPE_INT_N_1)
284 template<>
285 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
286 : public true_type { };
287
288 template<>
289 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
290 : public true_type { };
291#endif
292#if defined(__GLIBCXX_TYPE_INT_N_2)
293 template<>
294 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
295 : public true_type { };
296
297 template<>
298 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
299 : public true_type { };
300#endif
301#if defined(__GLIBCXX_TYPE_INT_N_3)
302 template<>
303 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
304 : public true_type { };
305
306 template<>
307 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
308 : public true_type { };
309#endif
310
311 /// is_integral
312 template<typename _Tp>
313 struct is_integral
314 : public __is_integral_helper<typename remove_cv<_Tp>::type>::type
315 { };
316
317 template<typename>
318 struct __is_floating_point_helper
319 : public false_type { };
320
321 template<>
322 struct __is_floating_point_helper<float>
323 : public true_type { };
324
325 template<>
326 struct __is_floating_point_helper<double>
327 : public true_type { };
328
329 template<>
330 struct __is_floating_point_helper<long double>
331 : public true_type { };
332
333#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
334 template<>
335 struct __is_floating_point_helper<__float128>
336 : public true_type { };
337#endif
338
339 /// is_floating_point
340 template<typename _Tp>
341 struct is_floating_point
342 : public __is_floating_point_helper<typename remove_cv<_Tp>::type>::type
343 { };
344
345 /// is_array
346 template<typename>
347 struct is_array
348 : public false_type { };
349
350 template<typename _Tp, std::size_t _Size>
351 struct is_array<_Tp[_Size]>
352 : public true_type { };
353
354 template<typename _Tp>
355 struct is_array<_Tp[]>
356 : public true_type { };
357
358 template<typename>
359 struct __is_pointer_helper
360 : public false_type { };
361
362 template<typename _Tp>
363 struct __is_pointer_helper<_Tp*>
364 : public true_type { };
365
366 /// is_pointer
367 template<typename _Tp>
368 struct is_pointer
369 : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type
370 { };
371
372 /// is_lvalue_reference
373 template<typename>
374 struct is_lvalue_reference
375 : public false_type { };
376
377 template<typename _Tp>
378 struct is_lvalue_reference<_Tp&>
379 : public true_type { };
380
381 /// is_rvalue_reference
382 template<typename>
383 struct is_rvalue_reference
384 : public false_type { };
385
386 template<typename _Tp>
387 struct is_rvalue_reference<_Tp&&>
388 : public true_type { };
389
390 template<typename>
391 struct is_function;
392
393 template<typename>
394 struct __is_member_object_pointer_helper
395 : public false_type { };
396
397 template<typename _Tp, typename _Cp>
398 struct __is_member_object_pointer_helper<_Tp _Cp::*>
399 : public integral_constant<bool, !is_function<_Tp>::value> { };
400
401 /// is_member_object_pointer
402 template<typename _Tp>
403 struct is_member_object_pointer
404 : public __is_member_object_pointer_helper<
405 typename remove_cv<_Tp>::type>::type
406 { };
407
408 template<typename>
409 struct __is_member_function_pointer_helper
410 : public false_type { };
411
412 template<typename _Tp, typename _Cp>
413 struct __is_member_function_pointer_helper<_Tp _Cp::*>
414 : public integral_constant<bool, is_function<_Tp>::value> { };
415
416 /// is_member_function_pointer
417 template<typename _Tp>
418 struct is_member_function_pointer
419 : public __is_member_function_pointer_helper<
420 typename remove_cv<_Tp>::type>::type
421 { };
422
423 /// is_enum
424 template<typename _Tp>
425 struct is_enum
426 : public integral_constant<bool, __is_enum(_Tp)>
427 { };
428
429 /// is_union
430 template<typename _Tp>
431 struct is_union
432 : public integral_constant<bool, __is_union(_Tp)>
433 { };
434
435 /// is_class
436 template<typename _Tp>
437 struct is_class
438 : public integral_constant<bool, __is_class(_Tp)>
439 { };
440
441 /// is_function
442 template<typename>
443 struct is_function
444 : public false_type { };
445
446 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
447 struct is_function<_Res(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL>
448 : public true_type { };
449
450 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
451 struct is_function<_Res(_ArgTypes...) & _GLIBCXX_NOEXCEPT_QUAL>
452 : public true_type { };
453
454 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
455 struct is_function<_Res(_ArgTypes...) && _GLIBCXX_NOEXCEPT_QUAL>
456 : public true_type { };
457
458 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
459 struct is_function<_Res(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL>
460 : public true_type { };
461
462 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
463 struct is_function<_Res(_ArgTypes......) & _GLIBCXX_NOEXCEPT_QUAL>
464 : public true_type { };
465
466 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
467 struct is_function<_Res(_ArgTypes......) && _GLIBCXX_NOEXCEPT_QUAL>
468 : public true_type { };
469
470 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
471 struct is_function<_Res(_ArgTypes...) const _GLIBCXX_NOEXCEPT_QUAL>
472 : public true_type { };
473
474 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
475 struct is_function<_Res(_ArgTypes...) const & _GLIBCXX_NOEXCEPT_QUAL>
476 : public true_type { };
477
478 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
479 struct is_function<_Res(_ArgTypes...) const && _GLIBCXX_NOEXCEPT_QUAL>
480 : public true_type { };
481
482 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
483 struct is_function<_Res(_ArgTypes......) const _GLIBCXX_NOEXCEPT_QUAL>
484 : public true_type { };
485
486 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
487 struct is_function<_Res(_ArgTypes......) const & _GLIBCXX_NOEXCEPT_QUAL>
488 : public true_type { };
489
490 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
491 struct is_function<_Res(_ArgTypes......) const && _GLIBCXX_NOEXCEPT_QUAL>
492 : public true_type { };
493
494 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
495 struct is_function<_Res(_ArgTypes...) volatile _GLIBCXX_NOEXCEPT_QUAL>
496 : public true_type { };
497
498 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
499 struct is_function<_Res(_ArgTypes...) volatile & _GLIBCXX_NOEXCEPT_QUAL>
500 : public true_type { };
501
502 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
503 struct is_function<_Res(_ArgTypes...) volatile && _GLIBCXX_NOEXCEPT_QUAL>
504 : public true_type { };
505
506 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
507 struct is_function<_Res(_ArgTypes......) volatile _GLIBCXX_NOEXCEPT_QUAL>
508 : public true_type { };
509
510 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
511 struct is_function<_Res(_ArgTypes......) volatile & _GLIBCXX_NOEXCEPT_QUAL>
512 : public true_type { };
513
514 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
515 struct is_function<_Res(_ArgTypes......) volatile && _GLIBCXX_NOEXCEPT_QUAL>
516 : public true_type { };
517
518 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
519 struct is_function<_Res(_ArgTypes...) const volatile _GLIBCXX_NOEXCEPT_QUAL>
520 : public true_type { };
521
522 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
523 struct is_function<_Res(_ArgTypes...) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
524 : public true_type { };
525
526 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
527 struct is_function<_Res(_ArgTypes...) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
528 : public true_type { };
529
530 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
531 struct is_function<_Res(_ArgTypes......) const volatile _GLIBCXX_NOEXCEPT_QUAL>
532 : public true_type { };
533
534 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
535 struct is_function<_Res(_ArgTypes......) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
536 : public true_type { };
537
538 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
539 struct is_function<_Res(_ArgTypes......) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
540 : public true_type { };
541
542#define __cpp_lib_is_null_pointer 201309
543
544 template<typename>
545 struct __is_null_pointer_helper
546 : public false_type { };
547
548 template<>
549 struct __is_null_pointer_helper<std::nullptr_t>
550 : public true_type { };
551
552 /// is_null_pointer (LWG 2247).
553 template<typename _Tp>
554 struct is_null_pointer
555 : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type
556 { };
557
558 /// __is_nullptr_t (extension).
559 template<typename _Tp>
560 struct __is_nullptr_t
561 : public is_null_pointer<_Tp>
562 { };
563
564 // Composite type categories.
565
566 /// is_reference
567 template<typename _Tp>
568 struct is_reference
569 : public __or_<is_lvalue_reference<_Tp>,
570 is_rvalue_reference<_Tp>>::type
571 { };
572
573 /// is_arithmetic
574 template<typename _Tp>
575 struct is_arithmetic
576 : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
577 { };
578
579 /// is_fundamental
580 template<typename _Tp>
581 struct is_fundamental
582 : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
583 is_null_pointer<_Tp>>::type
584 { };
585
586 /// is_object
587 template<typename _Tp>
588 struct is_object
589 : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
590 is_void<_Tp>>>::type
591 { };
592
593 template<typename>
594 struct is_member_pointer;
595
596 /// is_scalar
597 template<typename _Tp>
598 struct is_scalar
599 : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
600 is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
601 { };
602
603 /// is_compound
604 template<typename _Tp>
605 struct is_compound
606 : public integral_constant<bool, !is_fundamental<_Tp>::value> { };
607
608 template<typename _Tp>
609 struct __is_member_pointer_helper
610 : public false_type { };
611
612 template<typename _Tp, typename _Cp>
613 struct __is_member_pointer_helper<_Tp _Cp::*>
614 : public true_type { };
615
616 /// is_member_pointer
617 template<typename _Tp>
618 struct is_member_pointer
619 : public __is_member_pointer_helper<typename remove_cv<_Tp>::type>::type
620 { };
621
622 // Utility to detect referenceable types ([defns.referenceable]).
623
624 template<typename _Tp>
625 struct __is_referenceable
626 : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
627 { };
628
629 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
630 struct __is_referenceable<_Res(_Args...) _GLIBCXX_NOEXCEPT_QUAL>
631 : public true_type
632 { };
633
634 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
635 struct __is_referenceable<_Res(_Args......) _GLIBCXX_NOEXCEPT_QUAL>
636 : public true_type
637 { };
638
639 // Type properties.
640
641 /// is_const
642 template<typename>
643 struct is_const
644 : public false_type { };
645
646 template<typename _Tp>
647 struct is_const<_Tp const>
648 : public true_type { };
649
650 /// is_volatile
651 template<typename>
652 struct is_volatile
653 : public false_type { };
654
655 template<typename _Tp>
656 struct is_volatile<_Tp volatile>
657 : public true_type { };
658
659 /// is_trivial
660 template<typename _Tp>
661 struct is_trivial
662 : public integral_constant<bool, __is_trivial(_Tp)>
663 { };
664
665 // is_trivially_copyable
666 template<typename _Tp>
667 struct is_trivially_copyable
668 : public integral_constant<bool, __is_trivially_copyable(_Tp)>
669 { };
670
671 /// is_standard_layout
672 template<typename _Tp>
673 struct is_standard_layout
674 : public integral_constant<bool, __is_standard_layout(_Tp)>
675 { };
676
677 /// is_pod
678 // Could use is_standard_layout && is_trivial instead of the builtin.
679 template<typename _Tp>
680 struct is_pod
681 : public integral_constant<bool, __is_pod(_Tp)>
682 { };
683
684 /// is_literal_type
685 template<typename _Tp>
686 struct is_literal_type
687 : public integral_constant<bool, __is_literal_type(_Tp)>
688 { };
689
690 /// is_empty
691 template<typename _Tp>
692 struct is_empty
693 : public integral_constant<bool, __is_empty(_Tp)>
694 { };
695
696 /// is_polymorphic
697 template<typename _Tp>
698 struct is_polymorphic
699 : public integral_constant<bool, __is_polymorphic(_Tp)>
700 { };
701
702#if __cplusplus >= 201402L
703#define __cpp_lib_is_final 201402L
704 /// is_final
705 template<typename _Tp>
706 struct is_final
707 : public integral_constant<bool, __is_final(_Tp)>
708 { };
709#endif
710
711 /// is_abstract
712 template<typename _Tp>
713 struct is_abstract
714 : public integral_constant<bool, __is_abstract(_Tp)>
715 { };
716
717 template<typename _Tp,
718 bool = is_arithmetic<_Tp>::value>
719 struct __is_signed_helper
720 : public false_type { };
721
722 template<typename _Tp>
723 struct __is_signed_helper<_Tp, true>
724 : public integral_constant<bool, _Tp(-1) < _Tp(0)>
725 { };
726
727 /// is_signed
728 template<typename _Tp>
729 struct is_signed
730 : public __is_signed_helper<_Tp>::type
731 { };
732
733 /// is_unsigned
734 template<typename _Tp>
735 struct is_unsigned
736 : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
737 { };
738
739
740 // Destructible and constructible type properties.
741
742 /**
743 * @brief Utility to simplify expressions used in unevaluated operands
744 * @ingroup utilities
745 */
746
747 template<typename _Tp, typename _Up = _Tp&&>
748 _Up
749 __declval(int);
750
751 template<typename _Tp>
752 _Tp
753 __declval(long);
754
755 template<typename _Tp>
756 auto declval() noexcept -> decltype(__declval<_Tp>(0));
757
758 template<typename, unsigned = 0>
759 struct extent;
760
761 template<typename>
762 struct remove_all_extents;
763
764 template<typename _Tp>
765 struct __is_array_known_bounds
766 : public integral_constant<bool, (extent<_Tp>::value > 0)>
767 { };
768
769 template<typename _Tp>
770 struct __is_array_unknown_bounds
771 : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
772 { };
773
774 // In N3290 is_destructible does not say anything about function
775 // types and abstract types, see LWG 2049. This implementation
776 // describes function types as non-destructible and all complete
777 // object types as destructible, iff the explicit destructor
778 // call expression is wellformed.
779 struct __do_is_destructible_impl
780 {
781 template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
782 static true_type __test(int);
783
784 template<typename>
785 static false_type __test(...);
786 };
787
788 template<typename _Tp>
789 struct __is_destructible_impl
790 : public __do_is_destructible_impl
791 {
792 typedef decltype(__test<_Tp>(0)) type;
793 };
794
795 template<typename _Tp,
796 bool = __or_<is_void<_Tp>,
797 __is_array_unknown_bounds<_Tp>,
798 is_function<_Tp>>::value,
799 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
800 struct __is_destructible_safe;
801
802 template<typename _Tp>
803 struct __is_destructible_safe<_Tp, false, false>
804 : public __is_destructible_impl<typename
805 remove_all_extents<_Tp>::type>::type
806 { };
807
808 template<typename _Tp>
809 struct __is_destructible_safe<_Tp, true, false>
810 : public false_type { };
811
812 template<typename _Tp>
813 struct __is_destructible_safe<_Tp, false, true>
814 : public true_type { };
815
816 /// is_destructible
817 template<typename _Tp>
818 struct is_destructible
819 : public __is_destructible_safe<_Tp>::type
820 { };
821
822 // is_nothrow_destructible requires that is_destructible is
823 // satisfied as well. We realize that by mimicing the
824 // implementation of is_destructible but refer to noexcept(expr)
825 // instead of decltype(expr).
826 struct __do_is_nt_destructible_impl
827 {
828 template<typename _Tp>
829 static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())>
830 __test(int);
831
832 template<typename>
833 static false_type __test(...);
834 };
835
836 template<typename _Tp>
837 struct __is_nt_destructible_impl
838 : public __do_is_nt_destructible_impl
839 {
840 typedef decltype(__test<_Tp>(0)) type;
841 };
842
843 template<typename _Tp,
844 bool = __or_<is_void<_Tp>,
845 __is_array_unknown_bounds<_Tp>,
846 is_function<_Tp>>::value,
847 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
848 struct __is_nt_destructible_safe;
849
850 template<typename _Tp>
851 struct __is_nt_destructible_safe<_Tp, false, false>
852 : public __is_nt_destructible_impl<typename
853 remove_all_extents<_Tp>::type>::type
854 { };
855
856 template<typename _Tp>
857 struct __is_nt_destructible_safe<_Tp, true, false>
858 : public false_type { };
859
860 template<typename _Tp>
861 struct __is_nt_destructible_safe<_Tp, false, true>
862 : public true_type { };
863
864 /// is_nothrow_destructible
865 template<typename _Tp>
866 struct is_nothrow_destructible
867 : public __is_nt_destructible_safe<_Tp>::type
868 { };
869
870 /// is_constructible
871 template<typename _Tp, typename... _Args>
872 struct is_constructible
873 : public __bool_constant<__is_constructible(_Tp, _Args...)>
874 { };
875
876 /// is_default_constructible
877 template<typename _Tp>
878 struct is_default_constructible
879 : public is_constructible<_Tp>::type
880 { };
881
882 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
883 struct __is_copy_constructible_impl;
884
885 template<typename _Tp>
886 struct __is_copy_constructible_impl<_Tp, false>
887 : public false_type { };
888
889 template<typename _Tp>
890 struct __is_copy_constructible_impl<_Tp, true>
891 : public is_constructible<_Tp, const _Tp&>
892 { };
893
894 /// is_copy_constructible
895 template<typename _Tp>
896 struct is_copy_constructible
897 : public __is_copy_constructible_impl<_Tp>
898 { };
899
900 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
901 struct __is_move_constructible_impl;
902
903 template<typename _Tp>
904 struct __is_move_constructible_impl<_Tp, false>
905 : public false_type { };
906
907 template<typename _Tp>
908 struct __is_move_constructible_impl<_Tp, true>
909 : public is_constructible<_Tp, _Tp&&>
910 { };
911
912 /// is_move_constructible
913 template<typename _Tp>
914 struct is_move_constructible
915 : public __is_move_constructible_impl<_Tp>
916 { };
917
918 template<bool, typename _Tp, typename... _Args>
919 struct __is_nt_constructible_impl
920 : public false_type
921 { };
922
923 template<typename _Tp, typename... _Args>
924 struct __is_nt_constructible_impl<true, _Tp, _Args...>
925 : public __bool_constant<noexcept(_Tp(std::declval<_Args>()...))>
926 { };
927
928 template<typename _Tp, typename _Arg>
929 struct __is_nt_constructible_impl<true, _Tp, _Arg>
930 : public __bool_constant<noexcept(static_cast<_Tp>(std::declval<_Arg>()))>
931 { };
932
933 template<typename _Tp>
934 struct __is_nt_constructible_impl<true, _Tp>
935 : public __bool_constant<noexcept(_Tp())>
936 { };
937
938 template<typename _Tp, size_t _Num>
939 struct __is_nt_constructible_impl<true, _Tp[_Num]>
940 : public __bool_constant<noexcept(typename remove_all_extents<_Tp>::type())>
941 { };
942
943 template<typename _Tp, typename... _Args>
944 using __is_nothrow_constructible_impl
945 = __is_nt_constructible_impl<__is_constructible(_Tp, _Args...),
946 _Tp, _Args...>;
947
948 /// is_nothrow_constructible
949 template<typename _Tp, typename... _Args>
950 struct is_nothrow_constructible
951 : public __is_nothrow_constructible_impl<_Tp, _Args...>::type
952 { };
953
954 /// is_nothrow_default_constructible
955 template<typename _Tp>
956 struct is_nothrow_default_constructible
957 : public __is_nothrow_constructible_impl<_Tp>::type
958 { };
959
960
961 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
962 struct __is_nothrow_copy_constructible_impl;
963
964 template<typename _Tp>
965 struct __is_nothrow_copy_constructible_impl<_Tp, false>
966 : public false_type { };
967
968 template<typename _Tp>
969 struct __is_nothrow_copy_constructible_impl<_Tp, true>
970 : public is_nothrow_constructible<_Tp, const _Tp&>
971 { };
972
973 /// is_nothrow_copy_constructible
974 template<typename _Tp>
975 struct is_nothrow_copy_constructible
976 : public __is_nothrow_copy_constructible_impl<_Tp>
977 { };
978
979 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
980 struct __is_nothrow_move_constructible_impl;
981
982 template<typename _Tp>
983 struct __is_nothrow_move_constructible_impl<_Tp, false>
984 : public false_type { };
985
986 template<typename _Tp>
987 struct __is_nothrow_move_constructible_impl<_Tp, true>
988 : public is_nothrow_constructible<_Tp, _Tp&&>
989 { };
990
991 /// is_nothrow_move_constructible
992 template<typename _Tp>
993 struct is_nothrow_move_constructible
994 : public __is_nothrow_move_constructible_impl<_Tp>
995 { };
996
997 /// is_assignable
998 template<typename _Tp, typename _Up>
999 struct is_assignable
1000 : public __bool_constant<__is_assignable(_Tp, _Up)>
1001 { };
1002
1003 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1004 struct __is_copy_assignable_impl;
1005
1006 template<typename _Tp>
1007 struct __is_copy_assignable_impl<_Tp, false>
1008 : public false_type { };
1009
1010 template<typename _Tp>
1011 struct __is_copy_assignable_impl<_Tp, true>
1012 : public is_assignable<_Tp&, const _Tp&>
1013 { };
1014
1015 /// is_copy_assignable
1016 template<typename _Tp>
1017 struct is_copy_assignable
1018 : public __is_copy_assignable_impl<_Tp>
1019 { };
1020
1021 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1022 struct __is_move_assignable_impl;
1023
1024 template<typename _Tp>
1025 struct __is_move_assignable_impl<_Tp, false>
1026 : public false_type { };
1027
1028 template<typename _Tp>
1029 struct __is_move_assignable_impl<_Tp, true>
1030 : public is_assignable<_Tp&, _Tp&&>
1031 { };
1032
1033 /// is_move_assignable
1034 template<typename _Tp>
1035 struct is_move_assignable
1036 : public __is_move_assignable_impl<_Tp>
1037 { };
1038
1039 template<typename _Tp, typename _Up>
1040 struct __is_nt_assignable_impl
1041 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1042 { };
1043
1044 /// is_nothrow_assignable
1045 template<typename _Tp, typename _Up>
1046 struct is_nothrow_assignable
1047 : public __and_<is_assignable<_Tp, _Up>,
1048 __is_nt_assignable_impl<_Tp, _Up>>
1049 { };
1050
1051 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1052 struct __is_nt_copy_assignable_impl;
1053
1054 template<typename _Tp>
1055 struct __is_nt_copy_assignable_impl<_Tp, false>
1056 : public false_type { };
1057
1058 template<typename _Tp>
1059 struct __is_nt_copy_assignable_impl<_Tp, true>
1060 : public is_nothrow_assignable<_Tp&, const _Tp&>
1061 { };
1062
1063 /// is_nothrow_copy_assignable
1064 template<typename _Tp>
1065 struct is_nothrow_copy_assignable
1066 : public __is_nt_copy_assignable_impl<_Tp>
1067 { };
1068
1069 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1070 struct __is_nt_move_assignable_impl;
1071
1072 template<typename _Tp>
1073 struct __is_nt_move_assignable_impl<_Tp, false>
1074 : public false_type { };
1075
1076 template<typename _Tp>
1077 struct __is_nt_move_assignable_impl<_Tp, true>
1078 : public is_nothrow_assignable<_Tp&, _Tp&&>
1079 { };
1080
1081 /// is_nothrow_move_assignable
1082 template<typename _Tp>
1083 struct is_nothrow_move_assignable
1084 : public __is_nt_move_assignable_impl<_Tp>
1085 { };
1086
1087 /// is_trivially_constructible
1088 template<typename _Tp, typename... _Args>
1089 struct is_trivially_constructible
1090 : public __and_<is_constructible<_Tp, _Args...>, __bool_constant<
1091 __is_trivially_constructible(_Tp, _Args...)>>::type
1092 { };
1093
1094 /// is_trivially_default_constructible
1095 template<typename _Tp>
1096 struct is_trivially_default_constructible
1097 : public is_trivially_constructible<_Tp>::type
1098 { };
1099
1100 struct __do_is_implicitly_default_constructible_impl
1101 {
1102 template <typename _Tp>
1103 static void __helper(const _Tp&);
1104
1105 template <typename _Tp>
1106 static true_type __test(const _Tp&,
1107 decltype(__helper<const _Tp&>({}))* = 0);
1108
1109 static false_type __test(...);
1110 };
1111
1112 template<typename _Tp>
1113 struct __is_implicitly_default_constructible_impl
1114 : public __do_is_implicitly_default_constructible_impl
1115 {
1116 typedef decltype(__test(declval<_Tp>())) type;
1117 };
1118
1119 template<typename _Tp>
1120 struct __is_implicitly_default_constructible_safe
1121 : public __is_implicitly_default_constructible_impl<_Tp>::type
1122 { };
1123
1124 template <typename _Tp>
1125 struct __is_implicitly_default_constructible
1126 : public __and_<is_default_constructible<_Tp>,
1127 __is_implicitly_default_constructible_safe<_Tp>>
1128 { };
1129
1130 /// is_trivially_copy_constructible
1131
1132 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1133 struct __is_trivially_copy_constructible_impl;
1134
1135 template<typename _Tp>
1136 struct __is_trivially_copy_constructible_impl<_Tp, false>
1137 : public false_type { };
1138
1139 template<typename _Tp>
1140 struct __is_trivially_copy_constructible_impl<_Tp, true>
1141 : public __and_<is_copy_constructible<_Tp>,
1142 integral_constant<bool,
1143 __is_trivially_constructible(_Tp, const _Tp&)>>
1144 { };
1145
1146 template<typename _Tp>
1147 struct is_trivially_copy_constructible
1148 : public __is_trivially_copy_constructible_impl<_Tp>
1149 { };
1150
1151 /// is_trivially_move_constructible
1152
1153 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1154 struct __is_trivially_move_constructible_impl;
1155
1156 template<typename _Tp>
1157 struct __is_trivially_move_constructible_impl<_Tp, false>
1158 : public false_type { };
1159
1160 template<typename _Tp>
1161 struct __is_trivially_move_constructible_impl<_Tp, true>
1162 : public __and_<is_move_constructible<_Tp>,
1163 integral_constant<bool,
1164 __is_trivially_constructible(_Tp, _Tp&&)>>
1165 { };
1166
1167 template<typename _Tp>
1168 struct is_trivially_move_constructible
1169 : public __is_trivially_move_constructible_impl<_Tp>
1170 { };
1171
1172 /// is_trivially_assignable
1173 template<typename _Tp, typename _Up>
1174 struct is_trivially_assignable
1175 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1176 { };
1177
1178 /// is_trivially_copy_assignable
1179
1180 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1181 struct __is_trivially_copy_assignable_impl;
1182
1183 template<typename _Tp>
1184 struct __is_trivially_copy_assignable_impl<_Tp, false>
1185 : public false_type { };
1186
1187 template<typename _Tp>
1188 struct __is_trivially_copy_assignable_impl<_Tp, true>
1189 : public __and_<is_copy_assignable<_Tp>,
1190 integral_constant<bool,
1191 __is_trivially_assignable(_Tp&, const _Tp&)>>
1192 { };
1193
1194 template<typename _Tp>
1195 struct is_trivially_copy_assignable
1196 : public __is_trivially_copy_assignable_impl<_Tp>
1197 { };
1198
1199 /// is_trivially_move_assignable
1200
1201 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1202 struct __is_trivially_move_assignable_impl;
1203
1204 template<typename _Tp>
1205 struct __is_trivially_move_assignable_impl<_Tp, false>
1206 : public false_type { };
1207
1208 template<typename _Tp>
1209 struct __is_trivially_move_assignable_impl<_Tp, true>
1210 : public __and_<is_move_assignable<_Tp>,
1211 integral_constant<bool,
1212 __is_trivially_assignable(_Tp&, _Tp&&)>>
1213 { };
1214
1215 template<typename _Tp>
1216 struct is_trivially_move_assignable
1217 : public __is_trivially_move_assignable_impl<_Tp>
1218 { };
1219
1220 /// is_trivially_destructible
1221 template<typename _Tp>
1222 struct is_trivially_destructible
1223 : public __and_<is_destructible<_Tp>, integral_constant<bool,
1224 __has_trivial_destructor(_Tp)>>
1225 { };
1226
1227
1228 /// has_virtual_destructor
1229 template<typename _Tp>
1230 struct has_virtual_destructor
1231 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1232 { };
1233
1234
1235 // type property queries.
1236
1237 /// alignment_of
1238 template<typename _Tp>
1239 struct alignment_of
1240 : public integral_constant<std::size_t, alignof(_Tp)> { };
1241
1242 /// rank
1243 template<typename>
1244 struct rank
1245 : public integral_constant<std::size_t, 0> { };
1246
1247 template<typename _Tp, std::size_t _Size>
1248 struct rank<_Tp[_Size]>
1249 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1250
1251 template<typename _Tp>
1252 struct rank<_Tp[]>
1253 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1254
1255 /// extent
1256 template<typename, unsigned _Uint>
1257 struct extent
1258 : public integral_constant<std::size_t, 0> { };
1259
1260 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1261 struct extent<_Tp[_Size], _Uint>
1262 : public integral_constant<std::size_t,
1263 _Uint == 0 ? _Size : extent<_Tp,
1264 _Uint - 1>::value>
1265 { };
1266
1267 template<typename _Tp, unsigned _Uint>
1268 struct extent<_Tp[], _Uint>
1269 : public integral_constant<std::size_t,
1270 _Uint == 0 ? 0 : extent<_Tp,
1271 _Uint - 1>::value>
1272 { };
1273
1274
1275 // Type relations.
1276
1277 /// is_same
1278 template<typename, typename>
1279 struct is_same
1280 : public false_type { };
1281
1282 template<typename _Tp>
1283 struct is_same<_Tp, _Tp>
1284 : public true_type { };
1285
1286 /// is_base_of
1287 template<typename _Base, typename _Derived>
1288 struct is_base_of
1289 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1290 { };
1291
1292 template<typename _From, typename _To,
1293 bool = __or_<is_void<_From>, is_function<_To>,
1294 is_array<_To>>::value>
1295 struct __is_convertible_helper
1296 { typedef typename is_void<_To>::type type; };
1297
1298 template<typename _From, typename _To>
1299 class __is_convertible_helper<_From, _To, false>
1300 {
1301 template<typename _To1>
1302 static void __test_aux(_To1);
1303
1304 template<typename _From1, typename _To1,
1305 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1306 static true_type
1307 __test(int);
1308
1309 template<typename, typename>
1310 static false_type
1311 __test(...);
1312
1313 public:
1314 typedef decltype(__test<_From, _To>(0)) type;
1315 };
1316
1317
1318 /// is_convertible
1319 template<typename _From, typename _To>
1320 struct is_convertible
1321 : public __is_convertible_helper<_From, _To>::type
1322 { };
1323
1324
1325 // Const-volatile modifications.
1326
1327 /// remove_const
1328 template<typename _Tp>
1329 struct remove_const
1330 { typedef _Tp type; };
1331
1332 template<typename _Tp>
1333 struct remove_const<_Tp const>
1334 { typedef _Tp type; };
1335
1336 /// remove_volatile
1337 template<typename _Tp>
1338 struct remove_volatile
1339 { typedef _Tp type; };
1340
1341 template<typename _Tp>
1342 struct remove_volatile<_Tp volatile>
1343 { typedef _Tp type; };
1344
1345 /// remove_cv
1346 template<typename _Tp>
1347 struct remove_cv
1348 {
1349 typedef typename
1350 remove_const<typename remove_volatile<_Tp>::type>::type type;
1351 };
1352
1353 /// add_const
1354 template<typename _Tp>
1355 struct add_const
1356 { typedef _Tp const type; };
1357
1358 /// add_volatile
1359 template<typename _Tp>
1360 struct add_volatile
1361 { typedef _Tp volatile type; };
1362
1363 /// add_cv
1364 template<typename _Tp>
1365 struct add_cv
1366 {
1367 typedef typename
1368 add_const<typename add_volatile<_Tp>::type>::type type;
1369 };
1370
1371#if __cplusplus > 201103L
1372
1373#define __cpp_lib_transformation_trait_aliases 201304
1374
1375 /// Alias template for remove_const
1376 template<typename _Tp>
1377 using remove_const_t = typename remove_const<_Tp>::type;
1378
1379 /// Alias template for remove_volatile
1380 template<typename _Tp>
1381 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1382
1383 /// Alias template for remove_cv
1384 template<typename _Tp>
1385 using remove_cv_t = typename remove_cv<_Tp>::type;
1386
1387 /// Alias template for add_const
1388 template<typename _Tp>
1389 using add_const_t = typename add_const<_Tp>::type;
1390
1391 /// Alias template for add_volatile
1392 template<typename _Tp>
1393 using add_volatile_t = typename add_volatile<_Tp>::type;
1394
1395 /// Alias template for add_cv
1396 template<typename _Tp>
1397 using add_cv_t = typename add_cv<_Tp>::type;
1398#endif
1399
1400 // Reference transformations.
1401
1402 /// remove_reference
1403 template<typename _Tp>
1404 struct remove_reference
1405 { typedef _Tp type; };
1406
1407 template<typename _Tp>
1408 struct remove_reference<_Tp&>
1409 { typedef _Tp type; };
1410
1411 template<typename _Tp>
1412 struct remove_reference<_Tp&&>
1413 { typedef _Tp type; };
1414
1415 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1416 struct __add_lvalue_reference_helper
1417 { typedef _Tp type; };
1418
1419 template<typename _Tp>
1420 struct __add_lvalue_reference_helper<_Tp, true>
1421 { typedef _Tp& type; };
1422
1423 /// add_lvalue_reference
1424 template<typename _Tp>
1425 struct add_lvalue_reference
1426 : public __add_lvalue_reference_helper<_Tp>
1427 { };
1428
1429 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1430 struct __add_rvalue_reference_helper
1431 { typedef _Tp type; };
1432
1433 template<typename _Tp>
1434 struct __add_rvalue_reference_helper<_Tp, true>
1435 { typedef _Tp&& type; };
1436
1437 /// add_rvalue_reference
1438 template<typename _Tp>
1439 struct add_rvalue_reference
1440 : public __add_rvalue_reference_helper<_Tp>
1441 { };
1442
1443#if __cplusplus > 201103L
1444 /// Alias template for remove_reference
1445 template<typename _Tp>
1446 using remove_reference_t = typename remove_reference<_Tp>::type;
1447
1448 /// Alias template for add_lvalue_reference
1449 template<typename _Tp>
1450 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1451
1452 /// Alias template for add_rvalue_reference
1453 template<typename _Tp>
1454 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1455#endif
1456
1457 // Sign modifications.
1458
1459 // Utility for constructing identically cv-qualified types.
1460 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1461 struct __cv_selector;
1462
1463 template<typename _Unqualified>
1464 struct __cv_selector<_Unqualified, false, false>
1465 { typedef _Unqualified __type; };
1466
1467 template<typename _Unqualified>
1468 struct __cv_selector<_Unqualified, false, true>
1469 { typedef volatile _Unqualified __type; };
1470
1471 template<typename _Unqualified>
1472 struct __cv_selector<_Unqualified, true, false>
1473 { typedef const _Unqualified __type; };
1474
1475 template<typename _Unqualified>
1476 struct __cv_selector<_Unqualified, true, true>
1477 { typedef const volatile _Unqualified __type; };
1478
1479 template<typename _Qualified, typename _Unqualified,
1480 bool _IsConst = is_const<_Qualified>::value,
1481 bool _IsVol = is_volatile<_Qualified>::value>
1482 class __match_cv_qualifiers
1483 {
1484 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1485
1486 public:
1487 typedef typename __match::__type __type;
1488 };
1489
1490 // Utility for finding the unsigned versions of signed integral types.
1491 template<typename _Tp>
1492 struct __make_unsigned
1493 { typedef _Tp __type; };
1494
1495 template<>
1496 struct __make_unsigned<char>
1497 { typedef unsigned char __type; };
1498
1499 template<>
1500 struct __make_unsigned<signed char>
1501 { typedef unsigned char __type; };
1502
1503 template<>
1504 struct __make_unsigned<short>
1505 { typedef unsigned short __type; };
1506
1507 template<>
1508 struct __make_unsigned<int>
1509 { typedef unsigned int __type; };
1510
1511 template<>
1512 struct __make_unsigned<long>
1513 { typedef unsigned long __type; };
1514
1515 template<>
1516 struct __make_unsigned<long long>
1517 { typedef unsigned long long __type; };
1518
1519#if defined(__GLIBCXX_TYPE_INT_N_0)
1520 template<>
1521 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1522 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1523#endif
1524#if defined(__GLIBCXX_TYPE_INT_N_1)
1525 template<>
1526 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1527 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1528#endif
1529#if defined(__GLIBCXX_TYPE_INT_N_2)
1530 template<>
1531 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1532 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1533#endif
1534#if defined(__GLIBCXX_TYPE_INT_N_3)
1535 template<>
1536 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1537 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1538#endif
1539
1540 // Select between integral and enum: not possible to be both.
1541 template<typename _Tp,
1542 bool _IsInt = is_integral<_Tp>::value,
1543 bool _IsEnum = is_enum<_Tp>::value>
1544 class __make_unsigned_selector;
1545
1546 template<typename _Tp>
1547 class __make_unsigned_selector<_Tp, true, false>
1548 {
1549 typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt;
1550 typedef typename __unsignedt::__type __unsigned_type;
1551 typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
1552
1553 public:
1554 typedef typename __cv_unsigned::__type __type;
1555 };
1556
1557 template<typename _Tp>
1558 class __make_unsigned_selector<_Tp, false, true>
1559 {
1560 // With -fshort-enums, an enum may be as small as a char.
1561 typedef unsigned char __smallest;
1562 static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
1563 static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
1564 static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
1565 static const bool __b3 = sizeof(_Tp) <= sizeof(unsigned long);
1566 typedef conditional<__b3, unsigned long, unsigned long long> __cond3;
1567 typedef typename __cond3::type __cond3_type;
1568 typedef conditional<__b2, unsigned int, __cond3_type> __cond2;
1569 typedef typename __cond2::type __cond2_type;
1570 typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
1571 typedef typename __cond1::type __cond1_type;
1572
1573 typedef typename conditional<__b0, __smallest, __cond1_type>::type
1574 __unsigned_type;
1575 typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
1576
1577 public:
1578 typedef typename __cv_unsigned::__type __type;
1579 };
1580
1581 // Given an integral/enum type, return the corresponding unsigned
1582 // integer type.
1583 // Primary template.
1584 /// make_unsigned
1585 template<typename _Tp>
1586 struct make_unsigned
1587 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1588
1589 // Integral, but don't define.
1590 template<>
1591 struct make_unsigned<bool>;
1592
1593
1594 // Utility for finding the signed versions of unsigned integral types.
1595 template<typename _Tp>
1596 struct __make_signed
1597 { typedef _Tp __type; };
1598
1599 template<>
1600 struct __make_signed<char>
1601 { typedef signed char __type; };
1602
1603 template<>
1604 struct __make_signed<unsigned char>
1605 { typedef signed char __type; };
1606
1607 template<>
1608 struct __make_signed<unsigned short>
1609 { typedef signed short __type; };
1610
1611 template<>
1612 struct __make_signed<unsigned int>
1613 { typedef signed int __type; };
1614
1615 template<>
1616 struct __make_signed<unsigned long>
1617 { typedef signed long __type; };
1618
1619 template<>
1620 struct __make_signed<unsigned long long>
1621 { typedef signed long long __type; };
1622
1623#if defined(__GLIBCXX_TYPE_INT_N_0)
1624 template<>
1625 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1626 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1627#endif
1628#if defined(__GLIBCXX_TYPE_INT_N_1)
1629 template<>
1630 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1631 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1632#endif
1633#if defined(__GLIBCXX_TYPE_INT_N_2)
1634 template<>
1635 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1636 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1637#endif
1638#if defined(__GLIBCXX_TYPE_INT_N_3)
1639 template<>
1640 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1641 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1642#endif
1643
1644 // Select between integral and enum: not possible to be both.
1645 template<typename _Tp,
1646 bool _IsInt = is_integral<_Tp>::value,
1647 bool _IsEnum = is_enum<_Tp>::value>
1648 class __make_signed_selector;
1649
1650 template<typename _Tp>
1651 class __make_signed_selector<_Tp, true, false>
1652 {
1653 typedef __make_signed<typename remove_cv<_Tp>::type> __signedt;
1654 typedef typename __signedt::__type __signed_type;
1655 typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
1656
1657 public:
1658 typedef typename __cv_signed::__type __type;
1659 };
1660
1661 template<typename _Tp>
1662 class __make_signed_selector<_Tp, false, true>
1663 {
1664 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1665
1666 public:
1667 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1668 };
1669
1670 // Given an integral/enum type, return the corresponding signed
1671 // integer type.
1672 // Primary template.
1673 /// make_signed
1674 template<typename _Tp>
1675 struct make_signed
1676 { typedef typename __make_signed_selector<_Tp>::__type type; };
1677
1678 // Integral, but don't define.
1679 template<>
1680 struct make_signed<bool>;
1681
1682#if __cplusplus > 201103L
1683 /// Alias template for make_signed
1684 template<typename _Tp>
1685 using make_signed_t = typename make_signed<_Tp>::type;
1686
1687 /// Alias template for make_unsigned
1688 template<typename _Tp>
1689 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1690#endif
1691
1692 // Array modifications.
1693
1694 /// remove_extent
1695 template<typename _Tp>
1696 struct remove_extent
1697 { typedef _Tp type; };
1698
1699 template<typename _Tp, std::size_t _Size>
1700 struct remove_extent<_Tp[_Size]>
1701 { typedef _Tp type; };
1702
1703 template<typename _Tp>
1704 struct remove_extent<_Tp[]>
1705 { typedef _Tp type; };
1706
1707 /// remove_all_extents
1708 template<typename _Tp>
1709 struct remove_all_extents
1710 { typedef _Tp type; };
1711
1712 template<typename _Tp, std::size_t _Size>
1713 struct remove_all_extents<_Tp[_Size]>
1714 { typedef typename remove_all_extents<_Tp>::type type; };
1715
1716 template<typename _Tp>
1717 struct remove_all_extents<_Tp[]>
1718 { typedef typename remove_all_extents<_Tp>::type type; };
1719
1720#if __cplusplus > 201103L
1721 /// Alias template for remove_extent
1722 template<typename _Tp>
1723 using remove_extent_t = typename remove_extent<_Tp>::type;
1724
1725 /// Alias template for remove_all_extents
1726 template<typename _Tp>
1727 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1728#endif
1729
1730 // Pointer modifications.
1731
1732 template<typename _Tp, typename>
1733 struct __remove_pointer_helper
1734 { typedef _Tp type; };
1735
1736 template<typename _Tp, typename _Up>
1737 struct __remove_pointer_helper<_Tp, _Up*>
1738 { typedef _Up type; };
1739
1740 /// remove_pointer
1741 template<typename _Tp>
1742 struct remove_pointer
1743 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1744 { };
1745
1746 /// add_pointer
1747 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1748 is_void<_Tp>>::value>
1749 struct __add_pointer_helper
1750 { typedef _Tp type; };
1751
1752 template<typename _Tp>
1753 struct __add_pointer_helper<_Tp, true>
1754 { typedef typename remove_reference<_Tp>::type* type; };
1755
1756 template<typename _Tp>
1757 struct add_pointer
1758 : public __add_pointer_helper<_Tp>
1759 { };
1760
1761#if __cplusplus > 201103L
1762 /// Alias template for remove_pointer
1763 template<typename _Tp>
1764 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1765
1766 /// Alias template for add_pointer
1767 template<typename _Tp>
1768 using add_pointer_t = typename add_pointer<_Tp>::type;
1769#endif
1770
1771 template<std::size_t _Len>
1772 struct __aligned_storage_msa
1773 {
1774 union __type
1775 {
1776 unsigned char __data[_Len];
1777 struct __attribute__((__aligned__)) { } __align;
1778 };
1779 };
1780
1781 /**
1782 * @brief Alignment type.
1783 *
1784 * The value of _Align is a default-alignment which shall be the
1785 * most stringent alignment requirement for any C++ object type
1786 * whose size is no greater than _Len (3.9). The member typedef
1787 * type shall be a POD type suitable for use as uninitialized
1788 * storage for any object whose size is at most _Len and whose
1789 * alignment is a divisor of _Align.
1790 */
1791 template<std::size_t _Len, std::size_t _Align =
1792 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1793 struct aligned_storage
1794 {
1795 union type
1796 {
1797 unsigned char __data[_Len];
1798 struct __attribute__((__aligned__((_Align)))) { } __align;
1799 };
1800 };
1801
1802 template <typename... _Types>
1803 struct __strictest_alignment
1804 {
1805 static const size_t _S_alignment = 0;
1806 static const size_t _S_size = 0;
1807 };
1808
1809 template <typename _Tp, typename... _Types>
1810 struct __strictest_alignment<_Tp, _Types...>
1811 {
1812 static const size_t _S_alignment =
1813 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1814 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1815 static const size_t _S_size =
1816 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1817 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
1818 };
1819
1820 /**
1821 * @brief Provide aligned storage for types.
1822 *
1823 * [meta.trans.other]
1824 *
1825 * Provides aligned storage for any of the provided types of at
1826 * least size _Len.
1827 *
1828 * @see aligned_storage
1829 */
1830 template <size_t _Len, typename... _Types>
1831 struct aligned_union
1832 {
1833 private:
1834 static_assert(sizeof...(_Types) != 0, "At least one type is required");
1835
1836 using __strictest = __strictest_alignment<_Types...>;
1837 static const size_t _S_len = _Len > __strictest::_S_size
1838 ? _Len : __strictest::_S_size;
1839 public:
1840 /// The value of the strictest alignment of _Types.
1841 static const size_t alignment_value = __strictest::_S_alignment;
1842 /// The storage.
1843 typedef typename aligned_storage<_S_len, alignment_value>::type type;
1844 };
1845
1846 template <size_t _Len, typename... _Types>
1847 const size_t aligned_union<_Len, _Types...>::alignment_value;
1848
1849 // Decay trait for arrays and functions, used for perfect forwarding
1850 // in make_pair, make_tuple, etc.
1851 template<typename _Up,
1852 bool _IsArray = is_array<_Up>::value,
1853 bool _IsFunction = is_function<_Up>::value>
1854 struct __decay_selector;
1855
1856 // NB: DR 705.
1857 template<typename _Up>
1858 struct __decay_selector<_Up, false, false>
1859 { typedef typename remove_cv<_Up>::type __type; };
1860
1861 template<typename _Up>
1862 struct __decay_selector<_Up, true, false>
1863 { typedef typename remove_extent<_Up>::type* __type; };
1864
1865 template<typename _Up>
1866 struct __decay_selector<_Up, false, true>
1867 { typedef typename add_pointer<_Up>::type __type; };
1868
1869 /// decay
1870 template<typename _Tp>
1871 class decay
1872 {
1873 typedef typename remove_reference<_Tp>::type __remove_type;
1874
1875 public:
1876 typedef typename __decay_selector<__remove_type>::__type type;
1877 };
1878
1879 template<typename _Tp>
1880 class reference_wrapper;
1881
1882 // Helper which adds a reference to a type when given a reference_wrapper
1883 template<typename _Tp>
1884 struct __strip_reference_wrapper
1885 {
1886 typedef _Tp __type;
1887 };
1888
1889 template<typename _Tp>
1890 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
1891 {
1892 typedef _Tp& __type;
1893 };
1894
1895 template<typename _Tp>
1896 struct __decay_and_strip
1897 {
1898 typedef typename __strip_reference_wrapper<
1899 typename decay<_Tp>::type>::__type __type;
1900 };
1901
1902
1903 // Primary template.
1904 /// Define a member typedef @c type only if a boolean constant is true.
1905 template<bool, typename _Tp = void>
1906 struct enable_if
1907 { };
1908
1909 // Partial specialization for true.
1910 template<typename _Tp>
1911 struct enable_if<true, _Tp>
1912 { typedef _Tp type; };
1913
1914 template<typename... _Cond>
1915 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
1916
1917 // Primary template.
1918 /// Define a member typedef @c type to one of two argument types.
1919 template<bool _Cond, typename _Iftrue, typename _Iffalse>
1920 struct conditional
1921 { typedef _Iftrue type; };
1922
1923 // Partial specialization for false.
1924 template<typename _Iftrue, typename _Iffalse>
1925 struct conditional<false, _Iftrue, _Iffalse>
1926 { typedef _Iffalse type; };
1927
1928 /// common_type
1929 template<typename... _Tp>
1930 struct common_type;
1931
1932 // Sfinae-friendly common_type implementation:
1933
1934 struct __do_common_type_impl
1935 {
1936 template<typename _Tp, typename _Up>
1937 static __success_type<typename decay<decltype
1938 (true ? std::declval<_Tp>()
1939 : std::declval<_Up>())>::type> _S_test(int);
1940
1941 template<typename, typename>
1942 static __failure_type _S_test(...);
1943 };
1944
1945 template<typename _Tp, typename _Up>
1946 struct __common_type_impl
1947 : private __do_common_type_impl
1948 {
1949 typedef decltype(_S_test<_Tp, _Up>(0)) type;
1950 };
1951
1952 struct __do_member_type_wrapper
1953 {
1954 template<typename _Tp>
1955 static __success_type<typename _Tp::type> _S_test(int);
1956
1957 template<typename>
1958 static __failure_type _S_test(...);
1959 };
1960
1961 template<typename _Tp>
1962 struct __member_type_wrapper
1963 : private __do_member_type_wrapper
1964 {
1965 typedef decltype(_S_test<_Tp>(0)) type;
1966 };
1967
1968 template<typename _CTp, typename... _Args>
1969 struct __expanded_common_type_wrapper
1970 {
1971 typedef common_type<typename _CTp::type, _Args...> type;
1972 };
1973
1974 template<typename... _Args>
1975 struct __expanded_common_type_wrapper<__failure_type, _Args...>
1976 { typedef __failure_type type; };
1977
1978 template<>
1979 struct common_type<>
1980 { };
1981
1982 template<typename _Tp>
1983 struct common_type<_Tp>
1984 : common_type<_Tp, _Tp>
1985 { };
1986
1987 template<typename _Tp, typename _Up>
1988 struct common_type<_Tp, _Up>
1989 : public __common_type_impl<_Tp, _Up>::type
1990 { };
1991
1992 template<typename _Tp, typename _Up, typename... _Vp>
1993 struct common_type<_Tp, _Up, _Vp...>
1994 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
1995 common_type<_Tp, _Up>>::type, _Vp...>::type
1996 { };
1997
1998 /// The underlying type of an enum.
1999 template<typename _Tp>
2000 struct underlying_type
2001 {
2002 typedef __underlying_type(_Tp) type;
2003 };
2004
2005 template<typename _Tp>
2006 struct __declval_protector
2007 {
2008 static const bool __stop = false;
2009 };
2010
2011 template<typename _Tp>
2012 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2013 {
2014 static_assert(__declval_protector<_Tp>::__stop,
2015 "declval() must not be used!");
2016 return __declval<_Tp>(0);
2017 }
2018
2019 // wchar_t, char16_t and char32_t are integral types but are neither
2020 // signed integer types nor unsigned integer types, so must be
2021 // transformed to the integer type with the smallest rank that has the
2022 // same size and signedness.
2023 // Use the partial specialization for enumeration types to do that,
2024 // which means these explicit specializations must be defined after
2025 // std::conditional has been defined.
2026
2027#if defined(_GLIBCXX_USE_WCHAR_T)
2028 template<>
2029 struct __make_unsigned<wchar_t>
2030 {
2031 using __type
2032 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
2033 };
2034
2035 template<>
2036 struct __make_signed<wchar_t>
2037 {
2038 using __type
2039 = typename __make_signed_selector<wchar_t, false, true>::__type;
2040 };
2041#endif
2042
2043 template<>
2044 struct __make_unsigned<char16_t>
2045 {
2046 using __type
2047 = typename __make_unsigned_selector<char16_t, false, true>::__type;
2048 };
2049
2050 template<>
2051 struct __make_signed<char16_t>
2052 {
2053 using __type
2054 = typename __make_signed_selector<char16_t, false, true>::__type;
2055 };
2056
2057 template<>
2058 struct __make_unsigned<char32_t>
2059 {
2060 using __type
2061 = typename __make_unsigned_selector<char32_t, false, true>::__type;
2062 };
2063
2064 template<>
2065 struct __make_signed<char32_t>
2066 {
2067 using __type
2068 = typename __make_signed_selector<char32_t, false, true>::__type;
2069 };
2070
2071
2072 /// result_of
2073 template<typename _Signature>
2074 class result_of;
2075
2076 // Sfinae-friendly result_of implementation:
2077
2078#define __cpp_lib_result_of_sfinae 201210
2079
2080 struct __invoke_memfun_ref { };
2081 struct __invoke_memfun_deref { };
2082 struct __invoke_memobj_ref { };
2083 struct __invoke_memobj_deref { };
2084 struct __invoke_other { };
2085
2086 // Associate a tag type with a specialization of __success_type.
2087 template<typename _Tp, typename _Tag>
2088 struct __result_of_success : __success_type<_Tp>
2089 { using __invoke_type = _Tag; };
2090
2091 // [func.require] paragraph 1 bullet 1:
2092 struct __result_of_memfun_ref_impl
2093 {
2094 template<typename _Fp, typename _Tp1, typename... _Args>
2095 static __result_of_success<decltype(
2096 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2097 ), __invoke_memfun_ref> _S_test(int);
2098
2099 template<typename...>
2100 static __failure_type _S_test(...);
2101 };
2102
2103 template<typename _MemPtr, typename _Arg, typename... _Args>
2104 struct __result_of_memfun_ref
2105 : private __result_of_memfun_ref_impl
2106 {
2107 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2108 };
2109
2110 // [func.require] paragraph 1 bullet 2:
2111 struct __result_of_memfun_deref_impl
2112 {
2113 template<typename _Fp, typename _Tp1, typename... _Args>
2114 static __result_of_success<decltype(
2115 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2116 ), __invoke_memfun_deref> _S_test(int);
2117
2118 template<typename...>
2119 static __failure_type _S_test(...);
2120 };
2121
2122 template<typename _MemPtr, typename _Arg, typename... _Args>
2123 struct __result_of_memfun_deref
2124 : private __result_of_memfun_deref_impl
2125 {
2126 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2127 };
2128
2129 // [func.require] paragraph 1 bullet 3:
2130 struct __result_of_memobj_ref_impl
2131 {
2132 template<typename _Fp, typename _Tp1>
2133 static __result_of_success<decltype(
2134 std::declval<_Tp1>().*std::declval<_Fp>()
2135 ), __invoke_memobj_ref> _S_test(int);
2136
2137 template<typename, typename>
2138 static __failure_type _S_test(...);
2139 };
2140
2141 template<typename _MemPtr, typename _Arg>
2142 struct __result_of_memobj_ref
2143 : private __result_of_memobj_ref_impl
2144 {
2145 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2146 };
2147
2148 // [func.require] paragraph 1 bullet 4:
2149 struct __result_of_memobj_deref_impl
2150 {
2151 template<typename _Fp, typename _Tp1>
2152 static __result_of_success<decltype(
2153 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2154 ), __invoke_memobj_deref> _S_test(int);
2155
2156 template<typename, typename>
2157 static __failure_type _S_test(...);
2158 };
2159
2160 template<typename _MemPtr, typename _Arg>
2161 struct __result_of_memobj_deref
2162 : private __result_of_memobj_deref_impl
2163 {
2164 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2165 };
2166
2167 template<typename _MemPtr, typename _Arg>
2168 struct __result_of_memobj;
2169
2170 template<typename _Res, typename _Class, typename _Arg>
2171 struct __result_of_memobj<_Res _Class::*, _Arg>
2172 {
2173 typedef typename remove_cv<typename remove_reference<
2174 _Arg>::type>::type _Argval;
2175 typedef _Res _Class::* _MemPtr;
2176 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2177 is_base_of<_Class, _Argval>>::value,
2178 __result_of_memobj_ref<_MemPtr, _Arg>,
2179 __result_of_memobj_deref<_MemPtr, _Arg>
2180 >::type::type type;
2181 };
2182
2183 template<typename _MemPtr, typename _Arg, typename... _Args>
2184 struct __result_of_memfun;
2185
2186 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2187 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2188 {
2189 typedef typename remove_cv<typename remove_reference<
2190 _Arg>::type>::type _Argval;
2191 typedef _Res _Class::* _MemPtr;
2192 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2193 is_base_of<_Class, _Argval>>::value,
2194 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2195 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2196 >::type::type type;
2197 };
2198
2199 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2200 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2201 // as the object expression
2202
2203 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2204 template<typename _Tp, typename _Up = typename decay<_Tp>::type>
2205 struct __inv_unwrap
2206 {
2207 using type = _Tp;
2208 };
2209
2210 template<typename _Tp, typename _Up>
2211 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2212 {
2213 using type = _Up&;
2214 };
2215
2216 template<bool, bool, typename _Functor, typename... _ArgTypes>
2217 struct __result_of_impl
2218 {
2219 typedef __failure_type type;
2220 };
2221
2222 template<typename _MemPtr, typename _Arg>
2223 struct __result_of_impl<true, false, _MemPtr, _Arg>
2224 : public __result_of_memobj<typename decay<_MemPtr>::type,
2225 typename __inv_unwrap<_Arg>::type>
2226 { };
2227
2228 template<typename _MemPtr, typename _Arg, typename... _Args>
2229 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2230 : public __result_of_memfun<typename decay<_MemPtr>::type,
2231 typename __inv_unwrap<_Arg>::type, _Args...>
2232 { };
2233
2234 // [func.require] paragraph 1 bullet 5:
2235 struct __result_of_other_impl
2236 {
2237 template<typename _Fn, typename... _Args>
2238 static __result_of_success<decltype(
2239 std::declval<_Fn>()(std::declval<_Args>()...)
2240 ), __invoke_other> _S_test(int);
2241
2242 template<typename...>
2243 static __failure_type _S_test(...);
2244 };
2245
2246 template<typename _Functor, typename... _ArgTypes>
2247 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2248 : private __result_of_other_impl
2249 {
2250 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2251 };
2252
2253 // __invoke_result (std::invoke_result for C++11)
2254 template<typename _Functor, typename... _ArgTypes>
2255 struct __invoke_result
2256 : public __result_of_impl<
2257 is_member_object_pointer<
2258 typename remove_reference<_Functor>::type
2259 >::value,
2260 is_member_function_pointer<
2261 typename remove_reference<_Functor>::type
2262 >::value,
2263 _Functor, _ArgTypes...
2264 >::type
2265 { };
2266
2267 template<typename _Functor, typename... _ArgTypes>
2268 struct result_of<_Functor(_ArgTypes...)>
2269 : public __invoke_result<_Functor, _ArgTypes...>
2270 { };
2271
2272#if __cplusplus >= 201402L
2273 /// Alias template for aligned_storage
2274 template<size_t _Len, size_t _Align =
2275 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2276 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2277
2278 template <size_t _Len, typename... _Types>
2279 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2280
2281 /// Alias template for decay
2282 template<typename _Tp>
2283 using decay_t = typename decay<_Tp>::type;
2284
2285 /// Alias template for enable_if
2286 template<bool _Cond, typename _Tp = void>
2287 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2288
2289 /// Alias template for conditional
2290 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2291 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2292
2293 /// Alias template for common_type
2294 template<typename... _Tp>
2295 using common_type_t = typename common_type<_Tp...>::type;
2296
2297 /// Alias template for underlying_type
2298 template<typename _Tp>
2299 using underlying_type_t = typename underlying_type<_Tp>::type;
2300
2301 /// Alias template for result_of
2302 template<typename _Tp>
2303 using result_of_t = typename result_of<_Tp>::type;
2304#endif // C++14
2305
2306 // __enable_if_t (std::enable_if_t for C++11)
2307 template<bool _Cond, typename _Tp = void>
2308 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2309
2310 // __void_t (std::void_t for C++11)
2311 template<typename...> using __void_t = void;
2312
2313#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2314#define __cpp_lib_void_t 201411
2315 /// A metafunction that always yields void, used for detecting valid types.
2316 template<typename...> using void_t = void;
2317#endif
2318
2319 /// Implementation of the detection idiom (negative case).
2320 template<typename _Default, typename _AlwaysVoid,
2321 template<typename...> class _Op, typename... _Args>
2322 struct __detector
2323 {
2324 using value_t = false_type;
2325 using type = _Default;
2326 };
2327
2328 /// Implementation of the detection idiom (positive case).
2329 template<typename _Default, template<typename...> class _Op,
2330 typename... _Args>
2331 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2332 {
2333 using value_t = true_type;
2334 using type = _Op<_Args...>;
2335 };
2336
2337 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2338 template<typename _Default, template<typename...> class _Op,
2339 typename... _Args>
2340 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2341
2342 // _Op<_Args...> if that is a valid type, otherwise _Default.
2343 template<typename _Default, template<typename...> class _Op,
2344 typename... _Args>
2345 using __detected_or_t
2346 = typename __detected_or<_Default, _Op, _Args...>::type;
2347
2348 /// @} group metaprogramming
2349
2350 /**
2351 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2352 * member type _NTYPE.
2353 */
2354#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2355 template<typename _Tp, typename = __void_t<>> \
2356 struct __has_##_NTYPE \
2357 : false_type \
2358 { }; \
2359 template<typename _Tp> \
2360 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2361 : true_type \
2362 { };
2363
2364 template <typename _Tp>
2365 struct __is_swappable;
2366
2367 template <typename _Tp>
2368 struct __is_nothrow_swappable;
2369
2370 template<typename... _Elements>
2371 class tuple;
2372
2373 template<typename>
2374 struct __is_tuple_like_impl : false_type
2375 { };
2376
2377 template<typename... _Tps>
2378 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2379 { };
2380
2381 // Internal type trait that allows us to sfinae-protect tuple_cat.
2382 template<typename _Tp>
2383 struct __is_tuple_like
2384 : public __is_tuple_like_impl<typename remove_cv<
2385 typename remove_reference<_Tp>::type>::type>::type
2386 { };
2387
2388 template<typename _Tp>
2389 inline
2390 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2391 is_move_constructible<_Tp>,
2392 is_move_assignable<_Tp>>::value>::type
2393 swap(_Tp&, _Tp&)
2394 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2395 is_nothrow_move_assignable<_Tp>>::value);
2396
2397 template<typename _Tp, size_t _Nm>
2398 inline
2399 typename enable_if<__is_swappable<_Tp>::value>::type
2400 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2401 noexcept(__is_nothrow_swappable<_Tp>::value);
2402
2403 namespace __swappable_details {
2404 using std::swap;
2405
2406 struct __do_is_swappable_impl
2407 {
2408 template<typename _Tp, typename
2409 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2410 static true_type __test(int);
2411
2412 template<typename>
2413 static false_type __test(...);
2414 };
2415
2416 struct __do_is_nothrow_swappable_impl
2417 {
2418 template<typename _Tp>
2419 static __bool_constant<
2420 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2421 > __test(int);
2422
2423 template<typename>
2424 static false_type __test(...);
2425 };
2426
2427 } // namespace __swappable_details
2428
2429 template<typename _Tp>
2430 struct __is_swappable_impl
2431 : public __swappable_details::__do_is_swappable_impl
2432 {
2433 typedef decltype(__test<_Tp>(0)) type;
2434 };
2435
2436 template<typename _Tp>
2437 struct __is_nothrow_swappable_impl
2438 : public __swappable_details::__do_is_nothrow_swappable_impl
2439 {
2440 typedef decltype(__test<_Tp>(0)) type;
2441 };
2442
2443 template<typename _Tp>
2444 struct __is_swappable
2445 : public __is_swappable_impl<_Tp>::type
2446 { };
2447
2448 template<typename _Tp>
2449 struct __is_nothrow_swappable
2450 : public __is_nothrow_swappable_impl<_Tp>::type
2451 { };
2452
2453#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2454#define __cpp_lib_is_swappable 201603
2455 /// Metafunctions used for detecting swappable types: p0185r1
2456
2457 /// is_swappable
2458 template<typename _Tp>
2459 struct is_swappable
2460 : public __is_swappable_impl<_Tp>::type
2461 { };
2462
2463 /// is_nothrow_swappable
2464 template<typename _Tp>
2465 struct is_nothrow_swappable
2466 : public __is_nothrow_swappable_impl<_Tp>::type
2467 { };
2468
2469#if __cplusplus >= 201402L
2470 /// is_swappable_v
2471 template<typename _Tp>
2472 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2473 is_swappable<_Tp>::value;
2474
2475 /// is_nothrow_swappable_v
2476 template<typename _Tp>
2477 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2478 is_nothrow_swappable<_Tp>::value;
2479#endif // __cplusplus >= 201402L
2480
2481 namespace __swappable_with_details {
2482 using std::swap;
2483
2484 struct __do_is_swappable_with_impl
2485 {
2486 template<typename _Tp, typename _Up, typename
2487 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2488 typename
2489 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2490 static true_type __test(int);
2491
2492 template<typename, typename>
2493 static false_type __test(...);
2494 };
2495
2496 struct __do_is_nothrow_swappable_with_impl
2497 {
2498 template<typename _Tp, typename _Up>
2499 static __bool_constant<
2500 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2501 &&
2502 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2503 > __test(int);
2504
2505 template<typename, typename>
2506 static false_type __test(...);
2507 };
2508
2509 } // namespace __swappable_with_details
2510
2511 template<typename _Tp, typename _Up>
2512 struct __is_swappable_with_impl
2513 : public __swappable_with_details::__do_is_swappable_with_impl
2514 {
2515 typedef decltype(__test<_Tp, _Up>(0)) type;
2516 };
2517
2518 // Optimization for the homogenous lvalue case, not required:
2519 template<typename _Tp>
2520 struct __is_swappable_with_impl<_Tp&, _Tp&>
2521 : public __swappable_details::__do_is_swappable_impl
2522 {
2523 typedef decltype(__test<_Tp&>(0)) type;
2524 };
2525
2526 template<typename _Tp, typename _Up>
2527 struct __is_nothrow_swappable_with_impl
2528 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2529 {
2530 typedef decltype(__test<_Tp, _Up>(0)) type;
2531 };
2532
2533 // Optimization for the homogenous lvalue case, not required:
2534 template<typename _Tp>
2535 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2536 : public __swappable_details::__do_is_nothrow_swappable_impl
2537 {
2538 typedef decltype(__test<_Tp&>(0)) type;
2539 };
2540
2541 /// is_swappable_with
2542 template<typename _Tp, typename _Up>
2543 struct is_swappable_with
2544 : public __is_swappable_with_impl<_Tp, _Up>::type
2545 { };
2546
2547 /// is_nothrow_swappable_with
2548 template<typename _Tp, typename _Up>
2549 struct is_nothrow_swappable_with
2550 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2551 { };
2552
2553#if __cplusplus >= 201402L
2554 /// is_swappable_with_v
2555 template<typename _Tp, typename _Up>
2556 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2557 is_swappable_with<_Tp, _Up>::value;
2558
2559 /// is_nothrow_swappable_with_v
2560 template<typename _Tp, typename _Up>
2561 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2562 is_nothrow_swappable_with<_Tp, _Up>::value;
2563#endif // __cplusplus >= 201402L
2564
2565#endif// c++1z or gnu++11
2566
2567 // __is_invocable (std::is_invocable for C++11)
2568
2569 template<typename _Result, typename _Ret, typename = void>
2570 struct __is_invocable_impl : false_type { };
2571
2572 template<typename _Result, typename _Ret>
2573 struct __is_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>>
2574 : __or_<is_void<_Ret>, is_convertible<typename _Result::type, _Ret>>::type
2575 { };
2576
2577 template<typename _Fn, typename... _ArgTypes>
2578 struct __is_invocable
2579 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2580 { };
2581
2582 template<typename _Fn, typename _Tp, typename... _Args>
2583 constexpr bool __call_is_nt(__invoke_memfun_ref)
2584 {
2585 using _Up = typename __inv_unwrap<_Tp>::type;
2586 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2587 std::declval<_Args>()...));
2588 }
2589
2590 template<typename _Fn, typename _Tp, typename... _Args>
2591 constexpr bool __call_is_nt(__invoke_memfun_deref)
2592 {
2593 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2594 std::declval<_Args>()...));
2595 }
2596
2597 template<typename _Fn, typename _Tp>
2598 constexpr bool __call_is_nt(__invoke_memobj_ref)
2599 {
2600 using _Up = typename __inv_unwrap<_Tp>::type;
2601 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2602 }
2603
2604 template<typename _Fn, typename _Tp>
2605 constexpr bool __call_is_nt(__invoke_memobj_deref)
2606 {
2607 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2608 }
2609
2610 template<typename _Fn, typename... _Args>
2611 constexpr bool __call_is_nt(__invoke_other)
2612 {
2613 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2614 }
2615
2616 template<typename _Result, typename _Fn, typename... _Args>
2617 struct __call_is_nothrow
2618 : __bool_constant<
2619 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2620 >
2621 { };
2622
2623 template<typename _Fn, typename... _Args>
2624 using __call_is_nothrow_
2625 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2626
2627 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2628 template<typename _Fn, typename... _Args>
2629 struct __is_nothrow_invocable
2630 : __and_<__is_invocable<_Fn, _Args...>,
2631 __call_is_nothrow_<_Fn, _Args...>>::type
2632 { };
2633
2634 struct __nonesuch {
2635 __nonesuch() = delete;
2636 ~__nonesuch() = delete;
2637 __nonesuch(__nonesuch const&) = delete;
2638 void operator=(__nonesuch const&) = delete;
2639 };
2640
2641#if __cplusplus >= 201703L
2642# define __cpp_lib_is_invocable 201703
2643
2644 /// std::invoke_result
2645 template<typename _Functor, typename... _ArgTypes>
2646 struct invoke_result
2647 : public __invoke_result<_Functor, _ArgTypes...>
2648 { };
2649
2650 /// std::invoke_result_t
2651 template<typename _Fn, typename... _Args>
2652 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2653
2654 /// std::is_invocable
2655 template<typename _Fn, typename... _ArgTypes>
2656 struct is_invocable
2657 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2658 { };
2659
2660 /// std::is_invocable_r
2661 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2662 struct is_invocable_r
2663 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2664 { };
2665
2666 /// std::is_nothrow_invocable
2667 template<typename _Fn, typename... _ArgTypes>
2668 struct is_nothrow_invocable
2669 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2670 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2671 { };
2672
2673 template<typename _Result, typename _Ret, typename = void>
2674 struct __is_nt_invocable_impl : false_type { };
2675
2676 template<typename _Result, typename _Ret>
2677 struct __is_nt_invocable_impl<_Result, _Ret,
2678 __void_t<typename _Result::type>>
2679 : __or_<is_void<_Ret>,
2680 __and_<is_convertible<typename _Result::type, _Ret>,
2681 is_nothrow_constructible<_Ret, typename _Result::type>>>
2682 { };
2683
2684 /// std::is_nothrow_invocable_r
2685 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2686 struct is_nothrow_invocable_r
2687 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2688 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2689 { };
2690
2691 /// std::is_invocable_v
2692 template<typename _Fn, typename... _Args>
2693 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2694
2695 /// std::is_nothrow_invocable_v
2696 template<typename _Fn, typename... _Args>
2697 inline constexpr bool is_nothrow_invocable_v
2698 = is_nothrow_invocable<_Fn, _Args...>::value;
2699
2700 /// std::is_invocable_r_v
2701 template<typename _Fn, typename... _Args>
2702 inline constexpr bool is_invocable_r_v
2703 = is_invocable_r<_Fn, _Args...>::value;
2704
2705 /// std::is_nothrow_invocable_r_v
2706 template<typename _Fn, typename... _Args>
2707 inline constexpr bool is_nothrow_invocable_r_v
2708 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2709#endif // C++17
2710
2711#if __cplusplus >= 201703L
2712# define __cpp_lib_type_trait_variable_templates 201510L
2713template <typename _Tp>
2714 inline constexpr bool is_void_v = is_void<_Tp>::value;
2715template <typename _Tp>
2716 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2717template <typename _Tp>
2718 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2719template <typename _Tp>
2720 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2721template <typename _Tp>
2722 inline constexpr bool is_array_v = is_array<_Tp>::value;
2723template <typename _Tp>
2724 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2725template <typename _Tp>
2726 inline constexpr bool is_lvalue_reference_v =
2727 is_lvalue_reference<_Tp>::value;
2728template <typename _Tp>
2729 inline constexpr bool is_rvalue_reference_v =
2730 is_rvalue_reference<_Tp>::value;
2731template <typename _Tp>
2732 inline constexpr bool is_member_object_pointer_v =
2733 is_member_object_pointer<_Tp>::value;
2734template <typename _Tp>
2735 inline constexpr bool is_member_function_pointer_v =
2736 is_member_function_pointer<_Tp>::value;
2737template <typename _Tp>
2738 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2739template <typename _Tp>
2740 inline constexpr bool is_union_v = is_union<_Tp>::value;
2741template <typename _Tp>
2742 inline constexpr bool is_class_v = is_class<_Tp>::value;
2743template <typename _Tp>
2744 inline constexpr bool is_function_v = is_function<_Tp>::value;
2745template <typename _Tp>
2746 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2747template <typename _Tp>
2748 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2749template <typename _Tp>
2750 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2751template <typename _Tp>
2752 inline constexpr bool is_object_v = is_object<_Tp>::value;
2753template <typename _Tp>
2754 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2755template <typename _Tp>
2756 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2757template <typename _Tp>
2758 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2759template <typename _Tp>
2760 inline constexpr bool is_const_v = is_const<_Tp>::value;
2761template <typename _Tp>
2762 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2763template <typename _Tp>
2764 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2765template <typename _Tp>
2766 inline constexpr bool is_trivially_copyable_v =
2767 is_trivially_copyable<_Tp>::value;
2768template <typename _Tp>
2769 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2770template <typename _Tp>
2771 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2772template <typename _Tp>
2773 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2774template <typename _Tp>
2775 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2776template <typename _Tp>
2777 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2778template <typename _Tp>
2779 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2780template <typename _Tp>
2781 inline constexpr bool is_final_v = is_final<_Tp>::value;
2782template <typename _Tp>
2783 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2784template <typename _Tp>
2785 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2786template <typename _Tp, typename... _Args>
2787 inline constexpr bool is_constructible_v =
2788 is_constructible<_Tp, _Args...>::value;
2789template <typename _Tp>
2790 inline constexpr bool is_default_constructible_v =
2791 is_default_constructible<_Tp>::value;
2792template <typename _Tp>
2793 inline constexpr bool is_copy_constructible_v =
2794 is_copy_constructible<_Tp>::value;
2795template <typename _Tp>
2796 inline constexpr bool is_move_constructible_v =
2797 is_move_constructible<_Tp>::value;
2798template <typename _Tp, typename _Up>
2799 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2800template <typename _Tp>
2801 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2802template <typename _Tp>
2803 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2804template <typename _Tp>
2805 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2806template <typename _Tp, typename... _Args>
2807 inline constexpr bool is_trivially_constructible_v =
2808 is_trivially_constructible<_Tp, _Args...>::value;
2809template <typename _Tp>
2810 inline constexpr bool is_trivially_default_constructible_v =
2811 is_trivially_default_constructible<_Tp>::value;
2812template <typename _Tp>
2813 inline constexpr bool is_trivially_copy_constructible_v =
2814 is_trivially_copy_constructible<_Tp>::value;
2815template <typename _Tp>
2816 inline constexpr bool is_trivially_move_constructible_v =
2817 is_trivially_move_constructible<_Tp>::value;
2818template <typename _Tp, typename _Up>
2819 inline constexpr bool is_trivially_assignable_v =
2820 is_trivially_assignable<_Tp, _Up>::value;
2821template <typename _Tp>
2822 inline constexpr bool is_trivially_copy_assignable_v =
2823 is_trivially_copy_assignable<_Tp>::value;
2824template <typename _Tp>
2825 inline constexpr bool is_trivially_move_assignable_v =
2826 is_trivially_move_assignable<_Tp>::value;
2827template <typename _Tp>
2828 inline constexpr bool is_trivially_destructible_v =
2829 is_trivially_destructible<_Tp>::value;
2830template <typename _Tp, typename... _Args>
2831 inline constexpr bool is_nothrow_constructible_v =
2832 is_nothrow_constructible<_Tp, _Args...>::value;
2833template <typename _Tp>
2834 inline constexpr bool is_nothrow_default_constructible_v =
2835 is_nothrow_default_constructible<_Tp>::value;
2836template <typename _Tp>
2837 inline constexpr bool is_nothrow_copy_constructible_v =
2838 is_nothrow_copy_constructible<_Tp>::value;
2839template <typename _Tp>
2840 inline constexpr bool is_nothrow_move_constructible_v =
2841 is_nothrow_move_constructible<_Tp>::value;
2842template <typename _Tp, typename _Up>
2843 inline constexpr bool is_nothrow_assignable_v =
2844 is_nothrow_assignable<_Tp, _Up>::value;
2845template <typename _Tp>
2846 inline constexpr bool is_nothrow_copy_assignable_v =
2847 is_nothrow_copy_assignable<_Tp>::value;
2848template <typename _Tp>
2849 inline constexpr bool is_nothrow_move_assignable_v =
2850 is_nothrow_move_assignable<_Tp>::value;
2851template <typename _Tp>
2852 inline constexpr bool is_nothrow_destructible_v =
2853 is_nothrow_destructible<_Tp>::value;
2854template <typename _Tp>
2855 inline constexpr bool has_virtual_destructor_v =
2856 has_virtual_destructor<_Tp>::value;
2857template <typename _Tp>
2858 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2859template <typename _Tp>
2860 inline constexpr size_t rank_v = rank<_Tp>::value;
2861template <typename _Tp, unsigned _Idx = 0>
2862 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2863template <typename _Tp, typename _Up>
2864 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2865template <typename _Base, typename _Derived>
2866 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2867template <typename _From, typename _To>
2868 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
2869
2870#if __GNUC__ >= 7
2871# define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
2872#elif defined(__is_identifier)
2873// For non-GNU compilers:
2874# if ! __is_identifier(__has_unique_object_representations)
2875# define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
2876# endif
2877#endif
2878
2879#ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2880# define __cpp_lib_has_unique_object_representations 201606
2881 /// has_unique_object_representations
2882 template<typename _Tp>
2883 struct has_unique_object_representations
2884 : bool_constant<__has_unique_object_representations(
2885 remove_cv_t<remove_all_extents_t<_Tp>>
2886 )>
2887 { };
2888
2889 template<typename _Tp>
2890 inline constexpr bool has_unique_object_representations_v
2891 = has_unique_object_representations<_Tp>::value;
2892#endif
2893#undef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2894
2895#if __GNUC__ >= 7
2896# define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
2897#elif defined(__is_identifier)
2898// For non-GNU compilers:
2899# if ! __is_identifier(__is_aggregate)
2900# define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
2901# endif
2902#endif
2903
2904#ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
2905#define __cpp_lib_is_aggregate 201703
2906 /// is_aggregate
2907 template<typename _Tp>
2908 struct is_aggregate
2909 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
2910
2911 /// is_aggregate_v
2912 template<typename _Tp>
2913 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
2914#endif
2915#undef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
2916
2917#endif // C++17
2918
2919#if __cplusplus > 201703L
2920 /// Byte order
2921 enum class endian
2922 {
2923 little = __ORDER_LITTLE_ENDIAN__,
2924 big = __ORDER_BIG_ENDIAN__,
2925 native = __BYTE_ORDER__
2926 };
2927#endif // C++2a
2928
2929_GLIBCXX_END_NAMESPACE_VERSION
2930} // namespace std
2931
2932#endif // C++11
2933
2934#endif // _GLIBCXX_TYPE_TRAITS