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<bool, typename _Tp, typename... _Args>
930 struct __is_nt_constructible_impl
931 : public false_type
932 { };
933
934 template<typename _Tp, typename... _Args>
935 struct __is_nt_constructible_impl<true, _Tp, _Args...>
936 : public __bool_constant<noexcept(_Tp(std::declval<_Args>()...))>
937 { };
938
939 template<typename _Tp, typename _Arg>
940 struct __is_nt_constructible_impl<true, _Tp, _Arg>
941 : public __bool_constant<noexcept(static_cast<_Tp>(std::declval<_Arg>()))>
942 { };
943
944 template<typename _Tp>
945 struct __is_nt_constructible_impl<true, _Tp>
946 : public __bool_constant<noexcept(_Tp())>
947 { };
948
949 template<typename _Tp, size_t _Num>
950 struct __is_nt_constructible_impl<true, _Tp[_Num]>
951 : public __bool_constant<noexcept(typename remove_all_extents<_Tp>::type())>
952 { };
953
954 template<typename _Tp, typename... _Args>
955 using __is_nothrow_constructible_impl
956 = __is_nt_constructible_impl<__is_constructible(_Tp, _Args...),
957 _Tp, _Args...>;
958
959 /// is_nothrow_constructible
960 template<typename _Tp, typename... _Args>
961 struct is_nothrow_constructible
962 : public __is_nothrow_constructible_impl<_Tp, _Args...>::type
963 { };
964
965 /// is_nothrow_default_constructible
966 template<typename _Tp>
967 struct is_nothrow_default_constructible
968 : public __is_nothrow_constructible_impl<_Tp>::type
969 { };
970
971
972 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
973 struct __is_nothrow_copy_constructible_impl;
974
975 template<typename _Tp>
976 struct __is_nothrow_copy_constructible_impl<_Tp, false>
977 : public false_type { };
978
979 template<typename _Tp>
980 struct __is_nothrow_copy_constructible_impl<_Tp, true>
981 : public is_nothrow_constructible<_Tp, const _Tp&>
982 { };
983
984 /// is_nothrow_copy_constructible
985 template<typename _Tp>
986 struct is_nothrow_copy_constructible
987 : public __is_nothrow_copy_constructible_impl<_Tp>
988 { };
989
990 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
991 struct __is_nothrow_move_constructible_impl;
992
993 template<typename _Tp>
994 struct __is_nothrow_move_constructible_impl<_Tp, false>
995 : public false_type { };
996
997 template<typename _Tp>
998 struct __is_nothrow_move_constructible_impl<_Tp, true>
999 : public is_nothrow_constructible<_Tp, _Tp&&>
1000 { };
1001
1002 /// is_nothrow_move_constructible
1003 template<typename _Tp>
1004 struct is_nothrow_move_constructible
1005 : public __is_nothrow_move_constructible_impl<_Tp>
1006 { };
1007
1008 /// is_assignable
1009 template<typename _Tp, typename _Up>
1010 struct is_assignable
1011 : public __bool_constant<__is_assignable(_Tp, _Up)>
1012 { };
1013
1014 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1015 struct __is_copy_assignable_impl;
1016
1017 template<typename _Tp>
1018 struct __is_copy_assignable_impl<_Tp, false>
1019 : public false_type { };
1020
1021 template<typename _Tp>
1022 struct __is_copy_assignable_impl<_Tp, true>
1023 : public is_assignable<_Tp&, const _Tp&>
1024 { };
1025
1026 /// is_copy_assignable
1027 template<typename _Tp>
1028 struct is_copy_assignable
1029 : public __is_copy_assignable_impl<_Tp>
1030 { };
1031
1032 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1033 struct __is_move_assignable_impl;
1034
1035 template<typename _Tp>
1036 struct __is_move_assignable_impl<_Tp, false>
1037 : public false_type { };
1038
1039 template<typename _Tp>
1040 struct __is_move_assignable_impl<_Tp, true>
1041 : public is_assignable<_Tp&, _Tp&&>
1042 { };
1043
1044 /// is_move_assignable
1045 template<typename _Tp>
1046 struct is_move_assignable
1047 : public __is_move_assignable_impl<_Tp>
1048 { };
1049
1050 template<typename _Tp, typename _Up>
1051 struct __is_nt_assignable_impl
1052 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1053 { };
1054
1055 /// is_nothrow_assignable
1056 template<typename _Tp, typename _Up>
1057 struct is_nothrow_assignable
1058 : public __and_<is_assignable<_Tp, _Up>,
1059 __is_nt_assignable_impl<_Tp, _Up>>
1060 { };
1061
1062 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1063 struct __is_nt_copy_assignable_impl;
1064
1065 template<typename _Tp>
1066 struct __is_nt_copy_assignable_impl<_Tp, false>
1067 : public false_type { };
1068
1069 template<typename _Tp>
1070 struct __is_nt_copy_assignable_impl<_Tp, true>
1071 : public is_nothrow_assignable<_Tp&, const _Tp&>
1072 { };
1073
1074 /// is_nothrow_copy_assignable
1075 template<typename _Tp>
1076 struct is_nothrow_copy_assignable
1077 : public __is_nt_copy_assignable_impl<_Tp>
1078 { };
1079
1080 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1081 struct __is_nt_move_assignable_impl;
1082
1083 template<typename _Tp>
1084 struct __is_nt_move_assignable_impl<_Tp, false>
1085 : public false_type { };
1086
1087 template<typename _Tp>
1088 struct __is_nt_move_assignable_impl<_Tp, true>
1089 : public is_nothrow_assignable<_Tp&, _Tp&&>
1090 { };
1091
1092 /// is_nothrow_move_assignable
1093 template<typename _Tp>
1094 struct is_nothrow_move_assignable
1095 : public __is_nt_move_assignable_impl<_Tp>
1096 { };
1097
1098 /// is_trivially_constructible
1099 template<typename _Tp, typename... _Args>
1100 struct is_trivially_constructible
1101 : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
1102 { };
1103
1104 /// is_trivially_default_constructible
1105 template<typename _Tp>
1106 struct is_trivially_default_constructible
1107 : public is_trivially_constructible<_Tp>::type
1108 { };
1109
1110 struct __do_is_implicitly_default_constructible_impl
1111 {
1112 template <typename _Tp>
1113 static void __helper(const _Tp&);
1114
1115 template <typename _Tp>
1116 static true_type __test(const _Tp&,
1117 decltype(__helper<const _Tp&>({}))* = 0);
1118
1119 static false_type __test(...);
1120 };
1121
1122 template<typename _Tp>
1123 struct __is_implicitly_default_constructible_impl
1124 : public __do_is_implicitly_default_constructible_impl
1125 {
1126 typedef decltype(__test(declval<_Tp>())) type;
1127 };
1128
1129 template<typename _Tp>
1130 struct __is_implicitly_default_constructible_safe
1131 : public __is_implicitly_default_constructible_impl<_Tp>::type
1132 { };
1133
1134 template <typename _Tp>
1135 struct __is_implicitly_default_constructible
1136 : public __and_<is_default_constructible<_Tp>,
1137 __is_implicitly_default_constructible_safe<_Tp>>
1138 { };
1139
1140 /// is_trivially_copy_constructible
1141
1142 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1143 struct __is_trivially_copy_constructible_impl;
1144
1145 template<typename _Tp>
1146 struct __is_trivially_copy_constructible_impl<_Tp, false>
1147 : public false_type { };
1148
1149 template<typename _Tp>
1150 struct __is_trivially_copy_constructible_impl<_Tp, true>
1151 : public __and_<is_copy_constructible<_Tp>,
1152 integral_constant<bool,
1153 __is_trivially_constructible(_Tp, const _Tp&)>>
1154 { };
1155
1156 template<typename _Tp>
1157 struct is_trivially_copy_constructible
1158 : public __is_trivially_copy_constructible_impl<_Tp>
1159 { };
1160
1161 /// is_trivially_move_constructible
1162
1163 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1164 struct __is_trivially_move_constructible_impl;
1165
1166 template<typename _Tp>
1167 struct __is_trivially_move_constructible_impl<_Tp, false>
1168 : public false_type { };
1169
1170 template<typename _Tp>
1171 struct __is_trivially_move_constructible_impl<_Tp, true>
1172 : public __and_<is_move_constructible<_Tp>,
1173 integral_constant<bool,
1174 __is_trivially_constructible(_Tp, _Tp&&)>>
1175 { };
1176
1177 template<typename _Tp>
1178 struct is_trivially_move_constructible
1179 : public __is_trivially_move_constructible_impl<_Tp>
1180 { };
1181
1182 /// is_trivially_assignable
1183 template<typename _Tp, typename _Up>
1184 struct is_trivially_assignable
1185 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1186 { };
1187
1188 /// is_trivially_copy_assignable
1189
1190 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1191 struct __is_trivially_copy_assignable_impl;
1192
1193 template<typename _Tp>
1194 struct __is_trivially_copy_assignable_impl<_Tp, false>
1195 : public false_type { };
1196
1197 template<typename _Tp>
1198 struct __is_trivially_copy_assignable_impl<_Tp, true>
1199 : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
1200 { };
1201
1202 template<typename _Tp>
1203 struct is_trivially_copy_assignable
1204 : public __is_trivially_copy_assignable_impl<_Tp>
1205 { };
1206
1207 /// is_trivially_move_assignable
1208
1209 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1210 struct __is_trivially_move_assignable_impl;
1211
1212 template<typename _Tp>
1213 struct __is_trivially_move_assignable_impl<_Tp, false>
1214 : public false_type { };
1215
1216 template<typename _Tp>
1217 struct __is_trivially_move_assignable_impl<_Tp, true>
1218 : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
1219 { };
1220
1221 template<typename _Tp>
1222 struct is_trivially_move_assignable
1223 : public __is_trivially_move_assignable_impl<_Tp>
1224 { };
1225
1226 /// is_trivially_destructible
1227 template<typename _Tp>
1228 struct is_trivially_destructible
1229 : public __and_<is_destructible<_Tp>,
1230 __bool_constant<__has_trivial_destructor(_Tp)>>
1231 { };
1232
1233
1234 /// has_virtual_destructor
1235 template<typename _Tp>
1236 struct has_virtual_destructor
1237 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1238 { };
1239
1240
1241 // type property queries.
1242
1243 /// alignment_of
1244 template<typename _Tp>
1245 struct alignment_of
1246 : public integral_constant<std::size_t, alignof(_Tp)> { };
1247
1248 /// rank
1249 template<typename>
1250 struct rank
1251 : public integral_constant<std::size_t, 0> { };
1252
1253 template<typename _Tp, std::size_t _Size>
1254 struct rank<_Tp[_Size]>
1255 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1256
1257 template<typename _Tp>
1258 struct rank<_Tp[]>
1259 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1260
1261 /// extent
1262 template<typename, unsigned _Uint>
1263 struct extent
1264 : public integral_constant<std::size_t, 0> { };
1265
1266 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1267 struct extent<_Tp[_Size], _Uint>
1268 : public integral_constant<std::size_t,
1269 _Uint == 0 ? _Size : extent<_Tp,
1270 _Uint - 1>::value>
1271 { };
1272
1273 template<typename _Tp, unsigned _Uint>
1274 struct extent<_Tp[], _Uint>
1275 : public integral_constant<std::size_t,
1276 _Uint == 0 ? 0 : extent<_Tp,
1277 _Uint - 1>::value>
1278 { };
1279
1280
1281 // Type relations.
1282
1283 /// is_same
1284 template<typename, typename>
1285 struct is_same
1286 : public false_type { };
1287
1288 template<typename _Tp>
1289 struct is_same<_Tp, _Tp>
1290 : public true_type { };
1291
1292 /// is_base_of
1293 template<typename _Base, typename _Derived>
1294 struct is_base_of
1295 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1296 { };
1297
1298 template<typename _From, typename _To,
1299 bool = __or_<is_void<_From>, is_function<_To>,
1300 is_array<_To>>::value>
1301 struct __is_convertible_helper
1302 {
1303 typedef typename is_void<_To>::type type;
1304 };
1305
1306 template<typename _From, typename _To>
1307 class __is_convertible_helper<_From, _To, false>
1308 {
1309 template<typename _To1>
1310 static void __test_aux(_To1) noexcept;
1311
1312 template<typename _From1, typename _To1,
1313 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1314 static true_type
1315 __test(int);
1316
1317 template<typename, typename>
1318 static false_type
1319 __test(...);
1320
1321 public:
1322 typedef decltype(__test<_From, _To>(0)) type;
1323 };
1324
1325
1326 /// is_convertible
1327 template<typename _From, typename _To>
1328 struct is_convertible
1329 : public __is_convertible_helper<_From, _To>::type
1330 { };
1331
1332#if __cplusplus > 201703L
1333 template<typename _From, typename _To,
1334 bool = __or_<is_void<_From>, is_function<_To>,
1335 is_array<_To>>::value>
1336 struct __is_nt_convertible_helper
1337 : is_void<_To>
1338 { };
1339
1340 template<typename _From, typename _To>
1341 class __is_nt_convertible_helper<_From, _To, false>
1342 {
1343 template<typename _To1>
1344 static void __test_aux(_To1) noexcept;
1345
1346 template<typename _From1, typename _To1>
1347 static bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
1348 __test(int);
1349
1350 template<typename, typename>
1351 static false_type
1352 __test(...);
1353
1354 public:
1355 using type = decltype(__test<_From, _To>(0));
1356 };
1357
1358#define __cpp_lib_is_nothrow_convertible 201806L
1359 /// is_nothrow_convertible
1360 template<typename _From, typename _To>
1361 struct is_nothrow_convertible
1362 : public __is_nt_convertible_helper<_From, _To>::type
1363 { };
1364
1365 /// is_nothrow_convertible_v
1366 template<typename _From, typename _To>
1367 inline constexpr bool is_nothrow_convertible_v
1368 = is_nothrow_convertible<_From, _To>::value;
1369#endif // C++2a
1370
1371 // Const-volatile modifications.
1372
1373 /// remove_const
1374 template<typename _Tp>
1375 struct remove_const
1376 { typedef _Tp type; };
1377
1378 template<typename _Tp>
1379 struct remove_const<_Tp const>
1380 { typedef _Tp type; };
1381
1382 /// remove_volatile
1383 template<typename _Tp>
1384 struct remove_volatile
1385 { typedef _Tp type; };
1386
1387 template<typename _Tp>
1388 struct remove_volatile<_Tp volatile>
1389 { typedef _Tp type; };
1390
1391 /// remove_cv
1392 template<typename _Tp>
1393 struct remove_cv
1394 {
1395 typedef typename
1396 remove_const<typename remove_volatile<_Tp>::type>::type type;
1397 };
1398
1399 /// add_const
1400 template<typename _Tp>
1401 struct add_const
1402 { typedef _Tp const type; };
1403
1404 /// add_volatile
1405 template<typename _Tp>
1406 struct add_volatile
1407 { typedef _Tp volatile type; };
1408
1409 /// add_cv
1410 template<typename _Tp>
1411 struct add_cv
1412 {
1413 typedef typename
1414 add_const<typename add_volatile<_Tp>::type>::type type;
1415 };
1416
1417#if __cplusplus > 201103L
1418
1419#define __cpp_lib_transformation_trait_aliases 201304
1420
1421 /// Alias template for remove_const
1422 template<typename _Tp>
1423 using remove_const_t = typename remove_const<_Tp>::type;
1424
1425 /// Alias template for remove_volatile
1426 template<typename _Tp>
1427 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1428
1429 /// Alias template for remove_cv
1430 template<typename _Tp>
1431 using remove_cv_t = typename remove_cv<_Tp>::type;
1432
1433 /// Alias template for add_const
1434 template<typename _Tp>
1435 using add_const_t = typename add_const<_Tp>::type;
1436
1437 /// Alias template for add_volatile
1438 template<typename _Tp>
1439 using add_volatile_t = typename add_volatile<_Tp>::type;
1440
1441 /// Alias template for add_cv
1442 template<typename _Tp>
1443 using add_cv_t = typename add_cv<_Tp>::type;
1444#endif
1445
1446 // Reference transformations.
1447
1448 /// remove_reference
1449 template<typename _Tp>
1450 struct remove_reference
1451 { typedef _Tp type; };
1452
1453 template<typename _Tp>
1454 struct remove_reference<_Tp&>
1455 { typedef _Tp type; };
1456
1457 template<typename _Tp>
1458 struct remove_reference<_Tp&&>
1459 { typedef _Tp type; };
1460
1461 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1462 struct __add_lvalue_reference_helper
1463 { typedef _Tp type; };
1464
1465 template<typename _Tp>
1466 struct __add_lvalue_reference_helper<_Tp, true>
1467 { typedef _Tp& type; };
1468
1469 /// add_lvalue_reference
1470 template<typename _Tp>
1471 struct add_lvalue_reference
1472 : public __add_lvalue_reference_helper<_Tp>
1473 { };
1474
1475 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1476 struct __add_rvalue_reference_helper
1477 { typedef _Tp type; };
1478
1479 template<typename _Tp>
1480 struct __add_rvalue_reference_helper<_Tp, true>
1481 { typedef _Tp&& type; };
1482
1483 /// add_rvalue_reference
1484 template<typename _Tp>
1485 struct add_rvalue_reference
1486 : public __add_rvalue_reference_helper<_Tp>
1487 { };
1488
1489#if __cplusplus > 201103L
1490 /// Alias template for remove_reference
1491 template<typename _Tp>
1492 using remove_reference_t = typename remove_reference<_Tp>::type;
1493
1494 /// Alias template for add_lvalue_reference
1495 template<typename _Tp>
1496 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1497
1498 /// Alias template for add_rvalue_reference
1499 template<typename _Tp>
1500 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1501#endif
1502
1503 // Sign modifications.
1504
1505 // Utility for constructing identically cv-qualified types.
1506 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1507 struct __cv_selector;
1508
1509 template<typename _Unqualified>
1510 struct __cv_selector<_Unqualified, false, false>
1511 { typedef _Unqualified __type; };
1512
1513 template<typename _Unqualified>
1514 struct __cv_selector<_Unqualified, false, true>
1515 { typedef volatile _Unqualified __type; };
1516
1517 template<typename _Unqualified>
1518 struct __cv_selector<_Unqualified, true, false>
1519 { typedef const _Unqualified __type; };
1520
1521 template<typename _Unqualified>
1522 struct __cv_selector<_Unqualified, true, true>
1523 { typedef const volatile _Unqualified __type; };
1524
1525 template<typename _Qualified, typename _Unqualified,
1526 bool _IsConst = is_const<_Qualified>::value,
1527 bool _IsVol = is_volatile<_Qualified>::value>
1528 class __match_cv_qualifiers
1529 {
1530 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1531
1532 public:
1533 typedef typename __match::__type __type;
1534 };
1535
1536 // Utility for finding the unsigned versions of signed integral types.
1537 template<typename _Tp>
1538 struct __make_unsigned
1539 { typedef _Tp __type; };
1540
1541 template<>
1542 struct __make_unsigned<char>
1543 { typedef unsigned char __type; };
1544
1545 template<>
1546 struct __make_unsigned<signed char>
1547 { typedef unsigned char __type; };
1548
1549 template<>
1550 struct __make_unsigned<short>
1551 { typedef unsigned short __type; };
1552
1553 template<>
1554 struct __make_unsigned<int>
1555 { typedef unsigned int __type; };
1556
1557 template<>
1558 struct __make_unsigned<long>
1559 { typedef unsigned long __type; };
1560
1561 template<>
1562 struct __make_unsigned<long long>
1563 { typedef unsigned long long __type; };
1564
1565#if defined(__GLIBCXX_TYPE_INT_N_0)
1566 template<>
1567 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1568 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1569#endif
1570#if defined(__GLIBCXX_TYPE_INT_N_1)
1571 template<>
1572 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1573 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1574#endif
1575#if defined(__GLIBCXX_TYPE_INT_N_2)
1576 template<>
1577 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1578 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1579#endif
1580#if defined(__GLIBCXX_TYPE_INT_N_3)
1581 template<>
1582 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1583 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1584#endif
1585
1586 // Select between integral and enum: not possible to be both.
1587 template<typename _Tp,
1588 bool _IsInt = is_integral<_Tp>::value,
1589 bool _IsEnum = is_enum<_Tp>::value>
1590 class __make_unsigned_selector;
1591
1592 template<typename _Tp>
1593 class __make_unsigned_selector<_Tp, true, false>
1594 {
1595 using __unsigned_type
1596 = typename __make_unsigned<typename remove_cv<_Tp>::type>::__type;
1597
1598 public:
1599 using __type
1600 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1601 };
1602
1603 class __make_unsigned_selector_base
1604 {
1605 protected:
1606 template<typename...> struct _List { };
1607
1608 template<typename _Tp, typename... _Up>
1609 struct _List<_Tp, _Up...> : _List<_Up...>
1610 { static constexpr size_t __size = sizeof(_Tp); };
1611
1612 template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
1613 struct __select;
1614
1615 template<size_t _Sz, typename _Uint, typename... _UInts>
1616 struct __select<_Sz, _List<_Uint, _UInts...>, true>
1617 { using __type = _Uint; };
1618
1619 template<size_t _Sz, typename _Uint, typename... _UInts>
1620 struct __select<_Sz, _List<_Uint, _UInts...>, false>
1621 : __select<_Sz, _List<_UInts...>>
1622 { };
1623 };
1624
1625 // Choose unsigned integer type with the smallest rank and same size as _Tp
1626 template<typename _Tp>
1627 class __make_unsigned_selector<_Tp, false, true>
1628 : __make_unsigned_selector_base
1629 {
1630 // With -fshort-enums, an enum may be as small as a char.
1631 using _UInts = _List<unsigned char, unsigned short, unsigned int,
1632 unsigned long, unsigned long long>;
1633
1634 using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
1635
1636 public:
1637 using __type
1638 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1639 };
1640
1641 // wchar_t, char8_t, char16_t and char32_t are integral types but are
1642 // neither signed integer types nor unsigned integer types, so must be
1643 // transformed to the unsigned integer type with the smallest rank.
1644 // Use the partial specialization for enumeration types to do that.
1645#if defined(_GLIBCXX_USE_WCHAR_T)
1646 template<>
1647 struct __make_unsigned<wchar_t>
1648 {
1649 using __type
1650 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
1651 };
1652#endif
1653
1654#ifdef _GLIBCXX_USE_CHAR8_T
1655 template<>
1656 struct __make_unsigned<char8_t>
1657 {
1658 using __type
1659 = typename __make_unsigned_selector<char8_t, false, true>::__type;
1660 };
1661#endif
1662
1663 template<>
1664 struct __make_unsigned<char16_t>
1665 {
1666 using __type
1667 = typename __make_unsigned_selector<char16_t, false, true>::__type;
1668 };
1669
1670 template<>
1671 struct __make_unsigned<char32_t>
1672 {
1673 using __type
1674 = typename __make_unsigned_selector<char32_t, false, true>::__type;
1675 };
1676
1677 // Given an integral/enum type, return the corresponding unsigned
1678 // integer type.
1679 // Primary template.
1680 /// make_unsigned
1681 template<typename _Tp>
1682 struct make_unsigned
1683 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1684
1685 // Integral, but don't define.
1686 template<>
1687 struct make_unsigned<bool>;
1688
1689
1690 // Utility for finding the signed versions of unsigned integral types.
1691 template<typename _Tp>
1692 struct __make_signed
1693 { typedef _Tp __type; };
1694
1695 template<>
1696 struct __make_signed<char>
1697 { typedef signed char __type; };
1698
1699 template<>
1700 struct __make_signed<unsigned char>
1701 { typedef signed char __type; };
1702
1703 template<>
1704 struct __make_signed<unsigned short>
1705 { typedef signed short __type; };
1706
1707 template<>
1708 struct __make_signed<unsigned int>
1709 { typedef signed int __type; };
1710
1711 template<>
1712 struct __make_signed<unsigned long>
1713 { typedef signed long __type; };
1714
1715 template<>
1716 struct __make_signed<unsigned long long>
1717 { typedef signed long long __type; };
1718
1719#if defined(__GLIBCXX_TYPE_INT_N_0)
1720 template<>
1721 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1722 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1723#endif
1724#if defined(__GLIBCXX_TYPE_INT_N_1)
1725 template<>
1726 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1727 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1728#endif
1729#if defined(__GLIBCXX_TYPE_INT_N_2)
1730 template<>
1731 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1732 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1733#endif
1734#if defined(__GLIBCXX_TYPE_INT_N_3)
1735 template<>
1736 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1737 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1738#endif
1739
1740 // Select between integral and enum: not possible to be both.
1741 template<typename _Tp,
1742 bool _IsInt = is_integral<_Tp>::value,
1743 bool _IsEnum = is_enum<_Tp>::value>
1744 class __make_signed_selector;
1745
1746 template<typename _Tp>
1747 class __make_signed_selector<_Tp, true, false>
1748 {
1749 using __signed_type
1750 = typename __make_signed<typename remove_cv<_Tp>::type>::__type;
1751
1752 public:
1753 using __type
1754 = typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
1755 };
1756
1757 // Choose signed integer type with the smallest rank and same size as _Tp
1758 template<typename _Tp>
1759 class __make_signed_selector<_Tp, false, true>
1760 {
1761 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1762
1763 public:
1764 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1765 };
1766
1767 // wchar_t, char16_t and char32_t are integral types but are neither
1768 // signed integer types nor unsigned integer types, so must be
1769 // transformed to the signed integer type with the smallest rank.
1770 // Use the partial specialization for enumeration types to do that.
1771#if defined(_GLIBCXX_USE_WCHAR_T)
1772 template<>
1773 struct __make_signed<wchar_t>
1774 {
1775 using __type
1776 = typename __make_signed_selector<wchar_t, false, true>::__type;
1777 };
1778#endif
1779
1780#if defined(_GLIBCXX_USE_CHAR8_T)
1781 template<>
1782 struct __make_signed<char8_t>
1783 {
1784 using __type
1785 = typename __make_signed_selector<char8_t, false, true>::__type;
1786 };
1787#endif
1788
1789 template<>
1790 struct __make_signed<char16_t>
1791 {
1792 using __type
1793 = typename __make_signed_selector<char16_t, false, true>::__type;
1794 };
1795
1796 template<>
1797 struct __make_signed<char32_t>
1798 {
1799 using __type
1800 = typename __make_signed_selector<char32_t, false, true>::__type;
1801 };
1802
1803 // Given an integral/enum type, return the corresponding signed
1804 // integer type.
1805 // Primary template.
1806 /// make_signed
1807 template<typename _Tp>
1808 struct make_signed
1809 { typedef typename __make_signed_selector<_Tp>::__type type; };
1810
1811 // Integral, but don't define.
1812 template<>
1813 struct make_signed<bool>;
1814
1815#if __cplusplus > 201103L
1816 /// Alias template for make_signed
1817 template<typename _Tp>
1818 using make_signed_t = typename make_signed<_Tp>::type;
1819
1820 /// Alias template for make_unsigned
1821 template<typename _Tp>
1822 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1823#endif
1824
1825 // Array modifications.
1826
1827 /// remove_extent
1828 template<typename _Tp>
1829 struct remove_extent
1830 { typedef _Tp type; };
1831
1832 template<typename _Tp, std::size_t _Size>
1833 struct remove_extent<_Tp[_Size]>
1834 { typedef _Tp type; };
1835
1836 template<typename _Tp>
1837 struct remove_extent<_Tp[]>
1838 { typedef _Tp type; };
1839
1840 /// remove_all_extents
1841 template<typename _Tp>
1842 struct remove_all_extents
1843 { typedef _Tp type; };
1844
1845 template<typename _Tp, std::size_t _Size>
1846 struct remove_all_extents<_Tp[_Size]>
1847 { typedef typename remove_all_extents<_Tp>::type type; };
1848
1849 template<typename _Tp>
1850 struct remove_all_extents<_Tp[]>
1851 { typedef typename remove_all_extents<_Tp>::type type; };
1852
1853#if __cplusplus > 201103L
1854 /// Alias template for remove_extent
1855 template<typename _Tp>
1856 using remove_extent_t = typename remove_extent<_Tp>::type;
1857
1858 /// Alias template for remove_all_extents
1859 template<typename _Tp>
1860 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1861#endif
1862
1863 // Pointer modifications.
1864
1865 template<typename _Tp, typename>
1866 struct __remove_pointer_helper
1867 { typedef _Tp type; };
1868
1869 template<typename _Tp, typename _Up>
1870 struct __remove_pointer_helper<_Tp, _Up*>
1871 { typedef _Up type; };
1872
1873 /// remove_pointer
1874 template<typename _Tp>
1875 struct remove_pointer
1876 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1877 { };
1878
1879 /// add_pointer
1880 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1881 is_void<_Tp>>::value>
1882 struct __add_pointer_helper
1883 { typedef _Tp type; };
1884
1885 template<typename _Tp>
1886 struct __add_pointer_helper<_Tp, true>
1887 { typedef typename remove_reference<_Tp>::type* type; };
1888
1889 template<typename _Tp>
1890 struct add_pointer
1891 : public __add_pointer_helper<_Tp>
1892 { };
1893
1894#if __cplusplus > 201103L
1895 /// Alias template for remove_pointer
1896 template<typename _Tp>
1897 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1898
1899 /// Alias template for add_pointer
1900 template<typename _Tp>
1901 using add_pointer_t = typename add_pointer<_Tp>::type;
1902#endif
1903
1904 template<std::size_t _Len>
1905 struct __aligned_storage_msa
1906 {
1907 union __type
1908 {
1909 unsigned char __data[_Len];
1910 struct __attribute__((__aligned__)) { } __align;
1911 };
1912 };
1913
1914 /**
1915 * @brief Alignment type.
1916 *
1917 * The value of _Align is a default-alignment which shall be the
1918 * most stringent alignment requirement for any C++ object type
1919 * whose size is no greater than _Len (3.9). The member typedef
1920 * type shall be a POD type suitable for use as uninitialized
1921 * storage for any object whose size is at most _Len and whose
1922 * alignment is a divisor of _Align.
1923 */
1924 template<std::size_t _Len, std::size_t _Align =
1925 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1926 struct aligned_storage
1927 {
1928 union type
1929 {
1930 unsigned char __data[_Len];
1931 struct __attribute__((__aligned__((_Align)))) { } __align;
1932 };
1933 };
1934
1935 template <typename... _Types>
1936 struct __strictest_alignment
1937 {
1938 static const size_t _S_alignment = 0;
1939 static const size_t _S_size = 0;
1940 };
1941
1942 template <typename _Tp, typename... _Types>
1943 struct __strictest_alignment<_Tp, _Types...>
1944 {
1945 static const size_t _S_alignment =
1946 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1947 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1948 static const size_t _S_size =
1949 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1950 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
1951 };
1952
1953 /**
1954 * @brief Provide aligned storage for types.
1955 *
1956 * [meta.trans.other]
1957 *
1958 * Provides aligned storage for any of the provided types of at
1959 * least size _Len.
1960 *
1961 * @see aligned_storage
1962 */
1963 template <size_t _Len, typename... _Types>
1964 struct aligned_union
1965 {
1966 private:
1967 static_assert(sizeof...(_Types) != 0, "At least one type is required");
1968
1969 using __strictest = __strictest_alignment<_Types...>;
1970 static const size_t _S_len = _Len > __strictest::_S_size
1971 ? _Len : __strictest::_S_size;
1972 public:
1973 /// The value of the strictest alignment of _Types.
1974 static const size_t alignment_value = __strictest::_S_alignment;
1975 /// The storage.
1976 typedef typename aligned_storage<_S_len, alignment_value>::type type;
1977 };
1978
1979 template <size_t _Len, typename... _Types>
1980 const size_t aligned_union<_Len, _Types...>::alignment_value;
1981
1982 // Decay trait for arrays and functions, used for perfect forwarding
1983 // in make_pair, make_tuple, etc.
1984 template<typename _Up,
1985 bool _IsArray = is_array<_Up>::value,
1986 bool _IsFunction = is_function<_Up>::value>
1987 struct __decay_selector;
1988
1989 // NB: DR 705.
1990 template<typename _Up>
1991 struct __decay_selector<_Up, false, false>
1992 { typedef typename remove_cv<_Up>::type __type; };
1993
1994 template<typename _Up>
1995 struct __decay_selector<_Up, true, false>
1996 { typedef typename remove_extent<_Up>::type* __type; };
1997
1998 template<typename _Up>
1999 struct __decay_selector<_Up, false, true>
2000 { typedef typename add_pointer<_Up>::type __type; };
2001
2002 /// decay
2003 template<typename _Tp>
2004 class decay
2005 {
2006 typedef typename remove_reference<_Tp>::type __remove_type;
2007
2008 public:
2009 typedef typename __decay_selector<__remove_type>::__type type;
2010 };
2011
2012 template<typename _Tp>
2013 class reference_wrapper;
2014
2015 // Helper which adds a reference to a type when given a reference_wrapper
2016 template<typename _Tp>
2017 struct __strip_reference_wrapper
2018 {
2019 typedef _Tp __type;
2020 };
2021
2022 template<typename _Tp>
2023 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
2024 {
2025 typedef _Tp& __type;
2026 };
2027
2028 template<typename _Tp>
2029 struct __decay_and_strip
2030 {
2031 typedef typename __strip_reference_wrapper<
2032 typename decay<_Tp>::type>::__type __type;
2033 };
2034
2035
2036 // Primary template.
2037 /// Define a member typedef @c type only if a boolean constant is true.
2038 template<bool, typename _Tp = void>
2039 struct enable_if
2040 { };
2041
2042 // Partial specialization for true.
2043 template<typename _Tp>
2044 struct enable_if<true, _Tp>
2045 { typedef _Tp type; };
2046
2047 template<typename... _Cond>
2048 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
2049
2050 // Primary template.
2051 /// Define a member typedef @c type to one of two argument types.
2052 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2053 struct conditional
2054 { typedef _Iftrue type; };
2055
2056 // Partial specialization for false.
2057 template<typename _Iftrue, typename _Iffalse>
2058 struct conditional<false, _Iftrue, _Iffalse>
2059 { typedef _Iffalse type; };
2060
2061 /// common_type
2062 template<typename... _Tp>
2063 struct common_type;
2064
2065 // Sfinae-friendly common_type implementation:
2066
2067 struct __do_common_type_impl
2068 {
2069 template<typename _Tp, typename _Up>
2070 static __success_type<typename decay<decltype
2071 (true ? std::declval<_Tp>()
2072 : std::declval<_Up>())>::type> _S_test(int);
2073
2074 template<typename, typename>
2075 static __failure_type _S_test(...);
2076 };
2077
2078 template<typename _Tp, typename _Up>
2079 struct __common_type_impl
2080 : private __do_common_type_impl
2081 {
2082 typedef decltype(_S_test<_Tp, _Up>(0)) type;
2083 };
2084
2085 struct __do_member_type_wrapper
2086 {
2087 template<typename _Tp>
2088 static __success_type<typename _Tp::type> _S_test(int);
2089
2090 template<typename>
2091 static __failure_type _S_test(...);
2092 };
2093
2094 template<typename _Tp>
2095 struct __member_type_wrapper
2096 : private __do_member_type_wrapper
2097 {
2098 typedef decltype(_S_test<_Tp>(0)) type;
2099 };
2100
2101 template<typename _CTp, typename... _Args>
2102 struct __expanded_common_type_wrapper
2103 {
2104 typedef common_type<typename _CTp::type, _Args...> type;
2105 };
2106
2107 template<typename... _Args>
2108 struct __expanded_common_type_wrapper<__failure_type, _Args...>
2109 { typedef __failure_type type; };
2110
2111 template<>
2112 struct common_type<>
2113 { };
2114
2115 template<typename _Tp>
2116 struct common_type<_Tp>
2117 : common_type<_Tp, _Tp>
2118 { };
2119
2120 template<typename _Tp, typename _Up>
2121 struct common_type<_Tp, _Up>
2122 : public __common_type_impl<_Tp, _Up>::type
2123 { };
2124
2125 template<typename _Tp, typename _Up, typename... _Vp>
2126 struct common_type<_Tp, _Up, _Vp...>
2127 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
2128 common_type<_Tp, _Up>>::type, _Vp...>::type
2129 { };
2130
2131 template<typename _Tp, bool = is_enum<_Tp>::value>
2132 struct __underlying_type_impl
2133 {
2134 using type = __underlying_type(_Tp);
2135 };
2136
2137 template<typename _Tp>
2138 struct __underlying_type_impl<_Tp, false>
2139 { };
2140
2141 /// The underlying type of an enum.
2142 template<typename _Tp>
2143 struct underlying_type
2144 : public __underlying_type_impl<_Tp>
2145 { };
2146
2147 template<typename _Tp>
2148 struct __declval_protector
2149 {
2150 static const bool __stop = false;
2151 };
2152
2153 template<typename _Tp>
2154 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2155 {
2156 static_assert(__declval_protector<_Tp>::__stop,
2157 "declval() must not be used!");
2158 return __declval<_Tp>(0);
2159 }
2160
2161 // __remove_cvref_t (std::remove_cvref_t for C++11).
2162 template<typename _Tp>
2163 using __remove_cvref_t
2164 = typename remove_cv<typename remove_reference<_Tp>::type>::type;
2165
2166 /// result_of
2167 template<typename _Signature>
2168 class result_of;
2169
2170 // Sfinae-friendly result_of implementation:
2171
2172#define __cpp_lib_result_of_sfinae 201210
2173
2174 struct __invoke_memfun_ref { };
2175 struct __invoke_memfun_deref { };
2176 struct __invoke_memobj_ref { };
2177 struct __invoke_memobj_deref { };
2178 struct __invoke_other { };
2179
2180 // Associate a tag type with a specialization of __success_type.
2181 template<typename _Tp, typename _Tag>
2182 struct __result_of_success : __success_type<_Tp>
2183 { using __invoke_type = _Tag; };
2184
2185 // [func.require] paragraph 1 bullet 1:
2186 struct __result_of_memfun_ref_impl
2187 {
2188 template<typename _Fp, typename _Tp1, typename... _Args>
2189 static __result_of_success<decltype(
2190 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2191 ), __invoke_memfun_ref> _S_test(int);
2192
2193 template<typename...>
2194 static __failure_type _S_test(...);
2195 };
2196
2197 template<typename _MemPtr, typename _Arg, typename... _Args>
2198 struct __result_of_memfun_ref
2199 : private __result_of_memfun_ref_impl
2200 {
2201 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2202 };
2203
2204 // [func.require] paragraph 1 bullet 2:
2205 struct __result_of_memfun_deref_impl
2206 {
2207 template<typename _Fp, typename _Tp1, typename... _Args>
2208 static __result_of_success<decltype(
2209 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2210 ), __invoke_memfun_deref> _S_test(int);
2211
2212 template<typename...>
2213 static __failure_type _S_test(...);
2214 };
2215
2216 template<typename _MemPtr, typename _Arg, typename... _Args>
2217 struct __result_of_memfun_deref
2218 : private __result_of_memfun_deref_impl
2219 {
2220 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2221 };
2222
2223 // [func.require] paragraph 1 bullet 3:
2224 struct __result_of_memobj_ref_impl
2225 {
2226 template<typename _Fp, typename _Tp1>
2227 static __result_of_success<decltype(
2228 std::declval<_Tp1>().*std::declval<_Fp>()
2229 ), __invoke_memobj_ref> _S_test(int);
2230
2231 template<typename, typename>
2232 static __failure_type _S_test(...);
2233 };
2234
2235 template<typename _MemPtr, typename _Arg>
2236 struct __result_of_memobj_ref
2237 : private __result_of_memobj_ref_impl
2238 {
2239 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2240 };
2241
2242 // [func.require] paragraph 1 bullet 4:
2243 struct __result_of_memobj_deref_impl
2244 {
2245 template<typename _Fp, typename _Tp1>
2246 static __result_of_success<decltype(
2247 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2248 ), __invoke_memobj_deref> _S_test(int);
2249
2250 template<typename, typename>
2251 static __failure_type _S_test(...);
2252 };
2253
2254 template<typename _MemPtr, typename _Arg>
2255 struct __result_of_memobj_deref
2256 : private __result_of_memobj_deref_impl
2257 {
2258 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2259 };
2260
2261 template<typename _MemPtr, typename _Arg>
2262 struct __result_of_memobj;
2263
2264 template<typename _Res, typename _Class, typename _Arg>
2265 struct __result_of_memobj<_Res _Class::*, _Arg>
2266 {
2267 typedef __remove_cvref_t<_Arg> _Argval;
2268 typedef _Res _Class::* _MemPtr;
2269 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2270 is_base_of<_Class, _Argval>>::value,
2271 __result_of_memobj_ref<_MemPtr, _Arg>,
2272 __result_of_memobj_deref<_MemPtr, _Arg>
2273 >::type::type type;
2274 };
2275
2276 template<typename _MemPtr, typename _Arg, typename... _Args>
2277 struct __result_of_memfun;
2278
2279 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2280 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2281 {
2282 typedef typename remove_reference<_Arg>::type _Argval;
2283 typedef _Res _Class::* _MemPtr;
2284 typedef typename conditional<is_base_of<_Class, _Argval>::value,
2285 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2286 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2287 >::type::type type;
2288 };
2289
2290 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2291 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2292 // as the object expression
2293
2294 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2295 template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
2296 struct __inv_unwrap
2297 {
2298 using type = _Tp;
2299 };
2300
2301 template<typename _Tp, typename _Up>
2302 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2303 {
2304 using type = _Up&;
2305 };
2306
2307 template<bool, bool, typename _Functor, typename... _ArgTypes>
2308 struct __result_of_impl
2309 {
2310 typedef __failure_type type;
2311 };
2312
2313 template<typename _MemPtr, typename _Arg>
2314 struct __result_of_impl<true, false, _MemPtr, _Arg>
2315 : public __result_of_memobj<typename decay<_MemPtr>::type,
2316 typename __inv_unwrap<_Arg>::type>
2317 { };
2318
2319 template<typename _MemPtr, typename _Arg, typename... _Args>
2320 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2321 : public __result_of_memfun<typename decay<_MemPtr>::type,
2322 typename __inv_unwrap<_Arg>::type, _Args...>
2323 { };
2324
2325 // [func.require] paragraph 1 bullet 5:
2326 struct __result_of_other_impl
2327 {
2328 template<typename _Fn, typename... _Args>
2329 static __result_of_success<decltype(
2330 std::declval<_Fn>()(std::declval<_Args>()...)
2331 ), __invoke_other> _S_test(int);
2332
2333 template<typename...>
2334 static __failure_type _S_test(...);
2335 };
2336
2337 template<typename _Functor, typename... _ArgTypes>
2338 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2339 : private __result_of_other_impl
2340 {
2341 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2342 };
2343
2344 // __invoke_result (std::invoke_result for C++11)
2345 template<typename _Functor, typename... _ArgTypes>
2346 struct __invoke_result
2347 : public __result_of_impl<
2348 is_member_object_pointer<
2349 typename remove_reference<_Functor>::type
2350 >::value,
2351 is_member_function_pointer<
2352 typename remove_reference<_Functor>::type
2353 >::value,
2354 _Functor, _ArgTypes...
2355 >::type
2356 { };
2357
2358 template<typename _Functor, typename... _ArgTypes>
2359 struct result_of<_Functor(_ArgTypes...)>
2360 : public __invoke_result<_Functor, _ArgTypes...>
2361 { };
2362
2363#if __cplusplus >= 201402L
2364 /// Alias template for aligned_storage
2365 template<size_t _Len, size_t _Align =
2366 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2367 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2368
2369 template <size_t _Len, typename... _Types>
2370 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2371
2372 /// Alias template for decay
2373 template<typename _Tp>
2374 using decay_t = typename decay<_Tp>::type;
2375
2376 /// Alias template for enable_if
2377 template<bool _Cond, typename _Tp = void>
2378 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2379
2380 /// Alias template for conditional
2381 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2382 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2383
2384 /// Alias template for common_type
2385 template<typename... _Tp>
2386 using common_type_t = typename common_type<_Tp...>::type;
2387
2388 /// Alias template for underlying_type
2389 template<typename _Tp>
2390 using underlying_type_t = typename underlying_type<_Tp>::type;
2391
2392 /// Alias template for result_of
2393 template<typename _Tp>
2394 using result_of_t = typename result_of<_Tp>::type;
2395#endif // C++14
2396
2397 // __enable_if_t (std::enable_if_t for C++11)
2398 template<bool _Cond, typename _Tp = void>
2399 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2400
2401 // __void_t (std::void_t for C++11)
2402 template<typename...> using __void_t = void;
2403
2404#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2405#define __cpp_lib_void_t 201411
2406 /// A metafunction that always yields void, used for detecting valid types.
2407 template<typename...> using void_t = void;
2408#endif
2409
2410 /// Implementation of the detection idiom (negative case).
2411 template<typename _Default, typename _AlwaysVoid,
2412 template<typename...> class _Op, typename... _Args>
2413 struct __detector
2414 {
2415 using value_t = false_type;
2416 using type = _Default;
2417 };
2418
2419 /// Implementation of the detection idiom (positive case).
2420 template<typename _Default, template<typename...> class _Op,
2421 typename... _Args>
2422 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2423 {
2424 using value_t = true_type;
2425 using type = _Op<_Args...>;
2426 };
2427
2428 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2429 template<typename _Default, template<typename...> class _Op,
2430 typename... _Args>
2431 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2432
2433 // _Op<_Args...> if that is a valid type, otherwise _Default.
2434 template<typename _Default, template<typename...> class _Op,
2435 typename... _Args>
2436 using __detected_or_t
2437 = typename __detected_or<_Default, _Op, _Args...>::type;
2438
2439 /// @} group metaprogramming
2440
2441 /**
2442 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2443 * member type _NTYPE.
2444 */
2445#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2446 template<typename _Tp, typename = __void_t<>> \
2447 struct __has_##_NTYPE \
2448 : false_type \
2449 { }; \
2450 template<typename _Tp> \
2451 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2452 : true_type \
2453 { };
2454
2455 template <typename _Tp>
2456 struct __is_swappable;
2457
2458 template <typename _Tp>
2459 struct __is_nothrow_swappable;
2460
2461 template<typename... _Elements>
2462 class tuple;
2463
2464 template<typename>
2465 struct __is_tuple_like_impl : false_type
2466 { };
2467
2468 template<typename... _Tps>
2469 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2470 { };
2471
2472 // Internal type trait that allows us to sfinae-protect tuple_cat.
2473 template<typename _Tp>
2474 struct __is_tuple_like
2475 : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
2476 { };
2477
2478 template<typename _Tp>
2479 inline
2480 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2481 is_move_constructible<_Tp>,
2482 is_move_assignable<_Tp>>::value>::type
2483 swap(_Tp&, _Tp&)
2484 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2485 is_nothrow_move_assignable<_Tp>>::value);
2486
2487 template<typename _Tp, size_t _Nm>
2488 inline
2489 typename enable_if<__is_swappable<_Tp>::value>::type
2490 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2491 noexcept(__is_nothrow_swappable<_Tp>::value);
2492
2493 namespace __swappable_details {
2494 using std::swap;
2495
2496 struct __do_is_swappable_impl
2497 {
2498 template<typename _Tp, typename
2499 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2500 static true_type __test(int);
2501
2502 template<typename>
2503 static false_type __test(...);
2504 };
2505
2506 struct __do_is_nothrow_swappable_impl
2507 {
2508 template<typename _Tp>
2509 static __bool_constant<
2510 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2511 > __test(int);
2512
2513 template<typename>
2514 static false_type __test(...);
2515 };
2516
2517 } // namespace __swappable_details
2518
2519 template<typename _Tp>
2520 struct __is_swappable_impl
2521 : public __swappable_details::__do_is_swappable_impl
2522 {
2523 typedef decltype(__test<_Tp>(0)) type;
2524 };
2525
2526 template<typename _Tp>
2527 struct __is_nothrow_swappable_impl
2528 : public __swappable_details::__do_is_nothrow_swappable_impl
2529 {
2530 typedef decltype(__test<_Tp>(0)) type;
2531 };
2532
2533 template<typename _Tp>
2534 struct __is_swappable
2535 : public __is_swappable_impl<_Tp>::type
2536 { };
2537
2538 template<typename _Tp>
2539 struct __is_nothrow_swappable
2540 : public __is_nothrow_swappable_impl<_Tp>::type
2541 { };
2542
2543#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2544#define __cpp_lib_is_swappable 201603
2545 /// Metafunctions used for detecting swappable types: p0185r1
2546
2547 /// is_swappable
2548 template<typename _Tp>
2549 struct is_swappable
2550 : public __is_swappable_impl<_Tp>::type
2551 { };
2552
2553 /// is_nothrow_swappable
2554 template<typename _Tp>
2555 struct is_nothrow_swappable
2556 : public __is_nothrow_swappable_impl<_Tp>::type
2557 { };
2558
2559#if __cplusplus >= 201402L
2560 /// is_swappable_v
2561 template<typename _Tp>
2562 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2563 is_swappable<_Tp>::value;
2564
2565 /// is_nothrow_swappable_v
2566 template<typename _Tp>
2567 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2568 is_nothrow_swappable<_Tp>::value;
2569#endif // __cplusplus >= 201402L
2570
2571 namespace __swappable_with_details {
2572 using std::swap;
2573
2574 struct __do_is_swappable_with_impl
2575 {
2576 template<typename _Tp, typename _Up, typename
2577 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2578 typename
2579 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2580 static true_type __test(int);
2581
2582 template<typename, typename>
2583 static false_type __test(...);
2584 };
2585
2586 struct __do_is_nothrow_swappable_with_impl
2587 {
2588 template<typename _Tp, typename _Up>
2589 static __bool_constant<
2590 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2591 &&
2592 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2593 > __test(int);
2594
2595 template<typename, typename>
2596 static false_type __test(...);
2597 };
2598
2599 } // namespace __swappable_with_details
2600
2601 template<typename _Tp, typename _Up>
2602 struct __is_swappable_with_impl
2603 : public __swappable_with_details::__do_is_swappable_with_impl
2604 {
2605 typedef decltype(__test<_Tp, _Up>(0)) type;
2606 };
2607
2608 // Optimization for the homogenous lvalue case, not required:
2609 template<typename _Tp>
2610 struct __is_swappable_with_impl<_Tp&, _Tp&>
2611 : public __swappable_details::__do_is_swappable_impl
2612 {
2613 typedef decltype(__test<_Tp&>(0)) type;
2614 };
2615
2616 template<typename _Tp, typename _Up>
2617 struct __is_nothrow_swappable_with_impl
2618 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2619 {
2620 typedef decltype(__test<_Tp, _Up>(0)) type;
2621 };
2622
2623 // Optimization for the homogenous lvalue case, not required:
2624 template<typename _Tp>
2625 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2626 : public __swappable_details::__do_is_nothrow_swappable_impl
2627 {
2628 typedef decltype(__test<_Tp&>(0)) type;
2629 };
2630
2631 /// is_swappable_with
2632 template<typename _Tp, typename _Up>
2633 struct is_swappable_with
2634 : public __is_swappable_with_impl<_Tp, _Up>::type
2635 { };
2636
2637 /// is_nothrow_swappable_with
2638 template<typename _Tp, typename _Up>
2639 struct is_nothrow_swappable_with
2640 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2641 { };
2642
2643#if __cplusplus >= 201402L
2644 /// is_swappable_with_v
2645 template<typename _Tp, typename _Up>
2646 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2647 is_swappable_with<_Tp, _Up>::value;
2648
2649 /// is_nothrow_swappable_with_v
2650 template<typename _Tp, typename _Up>
2651 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2652 is_nothrow_swappable_with<_Tp, _Up>::value;
2653#endif // __cplusplus >= 201402L
2654
2655#endif// c++1z or gnu++11
2656
2657 // __is_invocable (std::is_invocable for C++11)
2658
2659 // The primary template is used for invalid INVOKE expressions.
2660 template<typename _Result, typename _Ret,
2661 bool = is_void<_Ret>::value, typename = void>
2662 struct __is_invocable_impl : false_type { };
2663
2664 // Used for valid INVOKE and INVOKE<void> expressions.
2665 template<typename _Result, typename _Ret>
2666 struct __is_invocable_impl<_Result, _Ret,
2667 /* is_void<_Ret> = */ true,
2668 __void_t<typename _Result::type>>
2669 : true_type
2670 { };
2671
2672#pragma GCC diagnostic push
2673#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
2674 // Used for INVOKE<R> expressions to check the implicit conversion to R.
2675 template<typename _Result, typename _Ret>
2676 struct __is_invocable_impl<_Result, _Ret,
2677 /* is_void<_Ret> = */ false,
2678 __void_t<typename _Result::type>>
2679 {
2680 private:
2681 // The type of the INVOKE expression.
2682 // Unlike declval, this doesn't add_rvalue_reference.
2683 static typename _Result::type _S_get();
2684
2685 template<typename _Tp>
2686 static void _S_conv(_Tp);
2687
2688 // This overload is viable if INVOKE(f, args...) can convert to _Tp.
2689 template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))>
2690 static true_type
2691 _S_test(int);
2692
2693 template<typename _Tp>
2694 static false_type
2695 _S_test(...);
2696
2697 public:
2698 using type = decltype(_S_test<_Ret>(1));
2699 };
2700#pragma GCC diagnostic pop
2701
2702 template<typename _Fn, typename... _ArgTypes>
2703 struct __is_invocable
2704 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2705 { };
2706
2707 template<typename _Fn, typename _Tp, typename... _Args>
2708 constexpr bool __call_is_nt(__invoke_memfun_ref)
2709 {
2710 using _Up = typename __inv_unwrap<_Tp>::type;
2711 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2712 std::declval<_Args>()...));
2713 }
2714
2715 template<typename _Fn, typename _Tp, typename... _Args>
2716 constexpr bool __call_is_nt(__invoke_memfun_deref)
2717 {
2718 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2719 std::declval<_Args>()...));
2720 }
2721
2722 template<typename _Fn, typename _Tp>
2723 constexpr bool __call_is_nt(__invoke_memobj_ref)
2724 {
2725 using _Up = typename __inv_unwrap<_Tp>::type;
2726 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2727 }
2728
2729 template<typename _Fn, typename _Tp>
2730 constexpr bool __call_is_nt(__invoke_memobj_deref)
2731 {
2732 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2733 }
2734
2735 template<typename _Fn, typename... _Args>
2736 constexpr bool __call_is_nt(__invoke_other)
2737 {
2738 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2739 }
2740
2741 template<typename _Result, typename _Fn, typename... _Args>
2742 struct __call_is_nothrow
2743 : __bool_constant<
2744 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2745 >
2746 { };
2747
2748 template<typename _Fn, typename... _Args>
2749 using __call_is_nothrow_
2750 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2751
2752 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2753 template<typename _Fn, typename... _Args>
2754 struct __is_nothrow_invocable
2755 : __and_<__is_invocable<_Fn, _Args...>,
2756 __call_is_nothrow_<_Fn, _Args...>>::type
2757 { };
2758
2759 struct __nonesuch {
2760 __nonesuch() = delete;
2761 ~__nonesuch() = delete;
2762 __nonesuch(__nonesuch const&) = delete;
2763 void operator=(__nonesuch const&) = delete;
2764 };
2765
2766#if __cplusplus >= 201703L
2767# define __cpp_lib_is_invocable 201703
2768
2769 /// std::invoke_result
2770 template<typename _Functor, typename... _ArgTypes>
2771 struct invoke_result
2772 : public __invoke_result<_Functor, _ArgTypes...>
2773 { };
2774
2775 /// std::invoke_result_t
2776 template<typename _Fn, typename... _Args>
2777 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2778
2779 /// std::is_invocable
2780 template<typename _Fn, typename... _ArgTypes>
2781 struct is_invocable
2782 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2783 { };
2784
2785 /// std::is_invocable_r
2786 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2787 struct is_invocable_r
2788 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2789 { };
2790
2791 /// std::is_nothrow_invocable
2792 template<typename _Fn, typename... _ArgTypes>
2793 struct is_nothrow_invocable
2794 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2795 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2796 { };
2797
2798 template<typename _Result, typename _Ret, typename = void>
2799 struct __is_nt_invocable_impl : false_type { };
2800
2801 template<typename _Result, typename _Ret>
2802 struct __is_nt_invocable_impl<_Result, _Ret,
2803 __void_t<typename _Result::type>>
2804 : __or_<is_void<_Ret>,
2805 __and_<is_convertible<typename _Result::type, _Ret>,
2806 is_nothrow_constructible<_Ret, typename _Result::type>>>
2807 { };
2808
2809 /// std::is_nothrow_invocable_r
2810 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2811 struct is_nothrow_invocable_r
2812 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2813 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2814 { };
2815
2816 /// std::is_invocable_v
2817 template<typename _Fn, typename... _Args>
2818 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2819
2820 /// std::is_nothrow_invocable_v
2821 template<typename _Fn, typename... _Args>
2822 inline constexpr bool is_nothrow_invocable_v
2823 = is_nothrow_invocable<_Fn, _Args...>::value;
2824
2825 /// std::is_invocable_r_v
2826 template<typename _Fn, typename... _Args>
2827 inline constexpr bool is_invocable_r_v
2828 = is_invocable_r<_Fn, _Args...>::value;
2829
2830 /// std::is_nothrow_invocable_r_v
2831 template<typename _Fn, typename... _Args>
2832 inline constexpr bool is_nothrow_invocable_r_v
2833 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2834#endif // C++17
2835
2836#if __cplusplus >= 201703L
2837# define __cpp_lib_type_trait_variable_templates 201510L
2838template <typename _Tp>
2839 inline constexpr bool is_void_v = is_void<_Tp>::value;
2840template <typename _Tp>
2841 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2842template <typename _Tp>
2843 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2844template <typename _Tp>
2845 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2846template <typename _Tp>
2847 inline constexpr bool is_array_v = is_array<_Tp>::value;
2848template <typename _Tp>
2849 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2850template <typename _Tp>
2851 inline constexpr bool is_lvalue_reference_v =
2852 is_lvalue_reference<_Tp>::value;
2853template <typename _Tp>
2854 inline constexpr bool is_rvalue_reference_v =
2855 is_rvalue_reference<_Tp>::value;
2856template <typename _Tp>
2857 inline constexpr bool is_member_object_pointer_v =
2858 is_member_object_pointer<_Tp>::value;
2859template <typename _Tp>
2860 inline constexpr bool is_member_function_pointer_v =
2861 is_member_function_pointer<_Tp>::value;
2862template <typename _Tp>
2863 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2864template <typename _Tp>
2865 inline constexpr bool is_union_v = is_union<_Tp>::value;
2866template <typename _Tp>
2867 inline constexpr bool is_class_v = is_class<_Tp>::value;
2868template <typename _Tp>
2869 inline constexpr bool is_function_v = is_function<_Tp>::value;
2870template <typename _Tp>
2871 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2872template <typename _Tp>
2873 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2874template <typename _Tp>
2875 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2876template <typename _Tp>
2877 inline constexpr bool is_object_v = is_object<_Tp>::value;
2878template <typename _Tp>
2879 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2880template <typename _Tp>
2881 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2882template <typename _Tp>
2883 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2884template <typename _Tp>
2885 inline constexpr bool is_const_v = is_const<_Tp>::value;
2886template <typename _Tp>
2887 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2888template <typename _Tp>
2889 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2890template <typename _Tp>
2891 inline constexpr bool is_trivially_copyable_v =
2892 is_trivially_copyable<_Tp>::value;
2893template <typename _Tp>
2894 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2895template <typename _Tp>
2896 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2897template <typename _Tp>
2898 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2899template <typename _Tp>
2900 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2901template <typename _Tp>
2902 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2903template <typename _Tp>
2904 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2905template <typename _Tp>
2906 inline constexpr bool is_final_v = is_final<_Tp>::value;
2907template <typename _Tp>
2908 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2909template <typename _Tp>
2910 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2911template <typename _Tp, typename... _Args>
2912 inline constexpr bool is_constructible_v =
2913 is_constructible<_Tp, _Args...>::value;
2914template <typename _Tp>
2915 inline constexpr bool is_default_constructible_v =
2916 is_default_constructible<_Tp>::value;
2917template <typename _Tp>
2918 inline constexpr bool is_copy_constructible_v =
2919 is_copy_constructible<_Tp>::value;
2920template <typename _Tp>
2921 inline constexpr bool is_move_constructible_v =
2922 is_move_constructible<_Tp>::value;
2923template <typename _Tp, typename _Up>
2924 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2925template <typename _Tp>
2926 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2927template <typename _Tp>
2928 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2929template <typename _Tp>
2930 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2931template <typename _Tp, typename... _Args>
2932 inline constexpr bool is_trivially_constructible_v =
2933 is_trivially_constructible<_Tp, _Args...>::value;
2934template <typename _Tp>
2935 inline constexpr bool is_trivially_default_constructible_v =
2936 is_trivially_default_constructible<_Tp>::value;
2937template <typename _Tp>
2938 inline constexpr bool is_trivially_copy_constructible_v =
2939 is_trivially_copy_constructible<_Tp>::value;
2940template <typename _Tp>
2941 inline constexpr bool is_trivially_move_constructible_v =
2942 is_trivially_move_constructible<_Tp>::value;
2943template <typename _Tp, typename _Up>
2944 inline constexpr bool is_trivially_assignable_v =
2945 is_trivially_assignable<_Tp, _Up>::value;
2946template <typename _Tp>
2947 inline constexpr bool is_trivially_copy_assignable_v =
2948 is_trivially_copy_assignable<_Tp>::value;
2949template <typename _Tp>
2950 inline constexpr bool is_trivially_move_assignable_v =
2951 is_trivially_move_assignable<_Tp>::value;
2952template <typename _Tp>
2953 inline constexpr bool is_trivially_destructible_v =
2954 is_trivially_destructible<_Tp>::value;
2955template <typename _Tp, typename... _Args>
2956 inline constexpr bool is_nothrow_constructible_v =
2957 is_nothrow_constructible<_Tp, _Args...>::value;
2958template <typename _Tp>
2959 inline constexpr bool is_nothrow_default_constructible_v =
2960 is_nothrow_default_constructible<_Tp>::value;
2961template <typename _Tp>
2962 inline constexpr bool is_nothrow_copy_constructible_v =
2963 is_nothrow_copy_constructible<_Tp>::value;
2964template <typename _Tp>
2965 inline constexpr bool is_nothrow_move_constructible_v =
2966 is_nothrow_move_constructible<_Tp>::value;
2967template <typename _Tp, typename _Up>
2968 inline constexpr bool is_nothrow_assignable_v =
2969 is_nothrow_assignable<_Tp, _Up>::value;
2970template <typename _Tp>
2971 inline constexpr bool is_nothrow_copy_assignable_v =
2972 is_nothrow_copy_assignable<_Tp>::value;
2973template <typename _Tp>
2974 inline constexpr bool is_nothrow_move_assignable_v =
2975 is_nothrow_move_assignable<_Tp>::value;
2976template <typename _Tp>
2977 inline constexpr bool is_nothrow_destructible_v =
2978 is_nothrow_destructible<_Tp>::value;
2979template <typename _Tp>
2980 inline constexpr bool has_virtual_destructor_v =
2981 has_virtual_destructor<_Tp>::value;
2982template <typename _Tp>
2983 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2984template <typename _Tp>
2985 inline constexpr size_t rank_v = rank<_Tp>::value;
2986template <typename _Tp, unsigned _Idx = 0>
2987 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2988template <typename _Tp, typename _Up>
2989 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2990template <typename _Base, typename _Derived>
2991 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2992template <typename _From, typename _To>
2993 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
2994
2995#ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2996# define __cpp_lib_has_unique_object_representations 201606
2997 /// has_unique_object_representations
2998 template<typename _Tp>
2999 struct has_unique_object_representations
3000 : bool_constant<__has_unique_object_representations(
3001 remove_cv_t<remove_all_extents_t<_Tp>>
3002 )>
3003 { };
3004
3005 template<typename _Tp>
3006 inline constexpr bool has_unique_object_representations_v
3007 = has_unique_object_representations<_Tp>::value;
3008#endif
3009
3010#ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
3011# define __cpp_lib_is_aggregate 201703
3012 /// is_aggregate
3013 template<typename _Tp>
3014 struct is_aggregate
3015 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
3016
3017 /// is_aggregate_v
3018 template<typename _Tp>
3019 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
3020#endif
3021#endif // C++17
3022
3023#if __cplusplus > 201703L
3024#define __cpp_lib_remove_cvref 201711L
3025
3026 /// Remove references and cv-qualifiers.
3027 template<typename _Tp>
3028 struct remove_cvref
3029 {
3030 using type = __remove_cvref_t<_Tp>;
3031 };
3032
3033 template<typename _Tp>
3034 using remove_cvref_t = __remove_cvref_t<_Tp>;
3035
3036#define __cpp_lib_type_identity 201806L
3037 /// Identity metafunction.
3038 template<typename _Tp>
3039 struct type_identity { using type = _Tp; };
3040
3041 template<typename _Tp>
3042 using type_identity_t = typename type_identity<_Tp>::type;
3043
3044#define __cpp_lib_unwrap_ref 201811L
3045
3046 /// Unwrap a reference_wrapper
3047 template<typename _Tp>
3048 struct unwrap_reference { using type = _Tp; };
3049
3050 template<typename _Tp>
3051 struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; };
3052
3053 template<typename _Tp>
3054 using unwrap_reference_t = typename unwrap_reference<_Tp>::type;
3055
3056 /// Decay type and if it's a reference_wrapper, unwrap it
3057 template<typename _Tp>
3058 struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; };
3059
3060 template<typename _Tp>
3061 using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
3062
3063#define __cpp_lib_bounded_array_traits 201902L
3064
3065 /// True for a type that is an array of known bound.
3066 template<typename _Tp>
3067 struct is_bounded_array
3068 : public __is_array_known_bounds<_Tp>
3069 { };
3070
3071 /// True for a type that is an array of unknown bound.
3072 template<typename _Tp>
3073 struct is_unbounded_array
3074 : public __is_array_unknown_bounds<_Tp>
3075 { };
3076
3077 template<typename _Tp>
3078 inline constexpr bool is_bounded_array_v
3079 = is_bounded_array<_Tp>::value;
3080
3081 template<typename _Tp>
3082 inline constexpr bool is_unbounded_array_v
3083 = is_unbounded_array<_Tp>::value;
3084
3085#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
3086
3087#define __cpp_lib_is_constant_evaluated 201811L
3088
3089 constexpr inline bool
3090 is_constant_evaluated() noexcept
3091 { return __builtin_is_constant_evaluated(); }
3092#endif
3093
3094#endif // C++2a
3095
3096_GLIBCXX_END_NAMESPACE_VERSION
3097} // namespace std
3098
3099#endif // C++11
3100
3101#endif // _GLIBCXX_TYPE_TRAITS
3102