1// C++11 <type_traits> -*- C++ -*-
2
3// Copyright (C) 2007-2019 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file include/type_traits
26 * This is a Standard C++ Library header.
27 */
28
29#ifndef _GLIBCXX_TYPE_TRAITS
30#define _GLIBCXX_TYPE_TRAITS 1
31
32#pragma GCC system_header
33
34#if __cplusplus < 201103L
35# include <bits/c++0x_warning.h>
36#else
37
38#include <bits/c++config.h>
39
40namespace std _GLIBCXX_VISIBILITY(default)
41{
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
43
44 /**
45 * @defgroup metaprogramming Metaprogramming
46 * @ingroup utilities
47 *
48 * Template utilities for compile-time introspection and modification,
49 * including type classification traits, type property inspection traits
50 * and type transformation traits.
51 *
52 * @{
53 */
54
55 /// integral_constant
56 template<typename _Tp, _Tp __v>
57 struct integral_constant
58 {
59 static constexpr _Tp value = __v;
60 typedef _Tp value_type;
61 typedef integral_constant<_Tp, __v> type;
62 constexpr operator value_type() const noexcept { return value; }
63#if __cplusplus > 201103L
64
65#define __cpp_lib_integral_constant_callable 201304
66
67 constexpr value_type operator()() const noexcept { return value; }
68#endif
69 };
70
71 template<typename _Tp, _Tp __v>
72 constexpr _Tp integral_constant<_Tp, __v>::value;
73
74 /// The type used as a compile-time boolean with true value.
75 typedef integral_constant<bool, true> true_type;
76
77 /// The type used as a compile-time boolean with false value.
78 typedef integral_constant<bool, false> false_type;
79
80 template<bool __v>
81 using __bool_constant = integral_constant<bool, __v>;
82
83#if __cplusplus > 201402L
84# define __cpp_lib_bool_constant 201505
85 template<bool __v>
86 using bool_constant = integral_constant<bool, __v>;
87#endif
88
89 // Meta programming helper types.
90
91 template<bool, typename, typename>
92 struct conditional;
93
94 template<typename...>
95 struct __or_;
96
97 template<>
98 struct __or_<>
99 : public false_type
100 { };
101
102 template<typename _B1>
103 struct __or_<_B1>
104 : public _B1
105 { };
106
107 template<typename _B1, typename _B2>
108 struct __or_<_B1, _B2>
109 : public conditional<_B1::value, _B1, _B2>::type
110 { };
111
112 template<typename _B1, typename _B2, typename _B3, typename... _Bn>
113 struct __or_<_B1, _B2, _B3, _Bn...>
114 : public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type
115 { };
116
117 template<typename...>
118 struct __and_;
119
120 template<>
121 struct __and_<>
122 : public true_type
123 { };
124
125 template<typename _B1>
126 struct __and_<_B1>
127 : public _B1
128 { };
129
130 template<typename _B1, typename _B2>
131 struct __and_<_B1, _B2>
132 : public conditional<_B1::value, _B2, _B1>::type
133 { };
134
135 template<typename _B1, typename _B2, typename _B3, typename... _Bn>
136 struct __and_<_B1, _B2, _B3, _Bn...>
137 : public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type
138 { };
139
140 template<typename _Pp>
141 struct __not_
142 : public __bool_constant<!bool(_Pp::value)>
143 { };
144
145#if __cplusplus >= 201703L
146
147 template<typename... _Bn>
148 inline constexpr bool __or_v = __or_<_Bn...>::value;
149 template<typename... _Bn>
150 inline constexpr bool __and_v = __and_<_Bn...>::value;
151
152#define __cpp_lib_logical_traits 201510
153
154 template<typename... _Bn>
155 struct conjunction
156 : __and_<_Bn...>
157 { };
158
159 template<typename... _Bn>
160 struct disjunction
161 : __or_<_Bn...>
162 { };
163
164 template<typename _Pp>
165 struct negation
166 : __not_<_Pp>
167 { };
168
169 template<typename... _Bn>
170 inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
171
172 template<typename... _Bn>
173 inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
174
175 template<typename _Pp>
176 inline constexpr bool negation_v = negation<_Pp>::value;
177
178#endif // C++17
179
180 // For several sfinae-friendly trait implementations we transport both the
181 // result information (as the member type) and the failure information (no
182 // member type). This is very similar to std::enable_if, but we cannot use
183 // them, because we need to derive from them as an implementation detail.
184
185 template<typename _Tp>
186 struct __success_type
187 { typedef _Tp type; };
188
189 struct __failure_type
190 { };
191
192 // Primary type categories.
193
194 template<typename>
195 struct remove_cv;
196
197 template<typename>
198 struct __is_void_helper
199 : public false_type { };
200
201 template<>
202 struct __is_void_helper<void>
203 : public true_type { };
204
205 /// is_void
206 template<typename _Tp>
207 struct is_void
208 : public __is_void_helper<typename remove_cv<_Tp>::type>::type
209 { };
210
211 template<typename>
212 struct __is_integral_helper
213 : public false_type { };
214
215 template<>
216 struct __is_integral_helper<bool>
217 : public true_type { };
218
219 template<>
220 struct __is_integral_helper<char>
221 : public true_type { };
222
223 template<>
224 struct __is_integral_helper<signed char>
225 : public true_type { };
226
227 template<>
228 struct __is_integral_helper<unsigned char>
229 : public true_type { };
230
231#ifdef _GLIBCXX_USE_WCHAR_T
232 template<>
233 struct __is_integral_helper<wchar_t>
234 : public true_type { };
235#endif
236
237#ifdef _GLIBCXX_USE_CHAR8_T
238 template<>
239 struct __is_integral_helper<char8_t>
240 : public true_type { };
241#endif
242
243 template<>
244 struct __is_integral_helper<char16_t>
245 : public true_type { };
246
247 template<>
248 struct __is_integral_helper<char32_t>
249 : public true_type { };
250
251 template<>
252 struct __is_integral_helper<short>
253 : public true_type { };
254
255 template<>
256 struct __is_integral_helper<unsigned short>
257 : public true_type { };
258
259 template<>
260 struct __is_integral_helper<int>
261 : public true_type { };
262
263 template<>
264 struct __is_integral_helper<unsigned int>
265 : public true_type { };
266
267 template<>
268 struct __is_integral_helper<long>
269 : public true_type { };
270
271 template<>
272 struct __is_integral_helper<unsigned long>
273 : public true_type { };
274
275 template<>
276 struct __is_integral_helper<long long>
277 : public true_type { };
278
279 template<>
280 struct __is_integral_helper<unsigned long long>
281 : public true_type { };
282
283 // Conditionalizing on __STRICT_ANSI__ here will break any port that
284 // uses one of these types for size_t.
285#if defined(__GLIBCXX_TYPE_INT_N_0)
286 template<>
287 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
288 : public true_type { };
289
290 template<>
291 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
292 : public true_type { };
293#endif
294#if defined(__GLIBCXX_TYPE_INT_N_1)
295 template<>
296 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
297 : public true_type { };
298
299 template<>
300 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
301 : public true_type { };
302#endif
303#if defined(__GLIBCXX_TYPE_INT_N_2)
304 template<>
305 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
306 : public true_type { };
307
308 template<>
309 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
310 : public true_type { };
311#endif
312#if defined(__GLIBCXX_TYPE_INT_N_3)
313 template<>
314 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
315 : public true_type { };
316
317 template<>
318 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
319 : public true_type { };
320#endif
321
322 /// is_integral
323 template<typename _Tp>
324 struct is_integral
325 : public __is_integral_helper<typename remove_cv<_Tp>::type>::type
326 { };
327
328 template<typename>
329 struct __is_floating_point_helper
330 : public false_type { };
331
332 template<>
333 struct __is_floating_point_helper<float>
334 : public true_type { };
335
336 template<>
337 struct __is_floating_point_helper<double>
338 : public true_type { };
339
340 template<>
341 struct __is_floating_point_helper<long double>
342 : public true_type { };
343
344#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) && !defined(__CUDACC__)
345 template<>
346 struct __is_floating_point_helper<__float128>
347 : public true_type { };
348#endif
349
350 /// is_floating_point
351 template<typename _Tp>
352 struct is_floating_point
353 : public __is_floating_point_helper<typename remove_cv<_Tp>::type>::type
354 { };
355
356 /// is_array
357 template<typename>
358 struct is_array
359 : public false_type { };
360
361 template<typename _Tp, std::size_t _Size>
362 struct is_array<_Tp[_Size]>
363 : public true_type { };
364
365 template<typename _Tp>
366 struct is_array<_Tp[]>
367 : public true_type { };
368
369 template<typename>
370 struct __is_pointer_helper
371 : public false_type { };
372
373 template<typename _Tp>
374 struct __is_pointer_helper<_Tp*>
375 : public true_type { };
376
377 /// is_pointer
378 template<typename _Tp>
379 struct is_pointer
380 : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type
381 { };
382
383 /// is_lvalue_reference
384 template<typename>
385 struct is_lvalue_reference
386 : public false_type { };
387
388 template<typename _Tp>
389 struct is_lvalue_reference<_Tp&>
390 : public true_type { };
391
392 /// is_rvalue_reference
393 template<typename>
394 struct is_rvalue_reference
395 : public false_type { };
396
397 template<typename _Tp>
398 struct is_rvalue_reference<_Tp&&>
399 : public true_type { };
400
401 template<typename>
402 struct is_function;
403
404 template<typename>
405 struct __is_member_object_pointer_helper
406 : public false_type { };
407
408 template<typename _Tp, typename _Cp>
409 struct __is_member_object_pointer_helper<_Tp _Cp::*>
410 : public __not_<is_function<_Tp>>::type { };
411
412 /// is_member_object_pointer
413 template<typename _Tp>
414 struct is_member_object_pointer
415 : public __is_member_object_pointer_helper<
416 typename remove_cv<_Tp>::type>::type
417 { };
418
419 template<typename>
420 struct __is_member_function_pointer_helper
421 : public false_type { };
422
423 template<typename _Tp, typename _Cp>
424 struct __is_member_function_pointer_helper<_Tp _Cp::*>
425 : public is_function<_Tp>::type { };
426
427 /// is_member_function_pointer
428 template<typename _Tp>
429 struct is_member_function_pointer
430 : public __is_member_function_pointer_helper<
431 typename remove_cv<_Tp>::type>::type
432 { };
433
434 /// is_enum
435 template<typename _Tp>
436 struct is_enum
437 : public integral_constant<bool, __is_enum(_Tp)>
438 { };
439
440 /// is_union
441 template<typename _Tp>
442 struct is_union
443 : public integral_constant<bool, __is_union(_Tp)>
444 { };
445
446 /// is_class
447 template<typename _Tp>
448 struct is_class
449 : public integral_constant<bool, __is_class(_Tp)>
450 { };
451
452 /// is_function
453 template<typename>
454 struct is_function
455 : public false_type { };
456
457 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
458 struct is_function<_Res(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL>
459 : public true_type { };
460
461 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
462 struct is_function<_Res(_ArgTypes...) & _GLIBCXX_NOEXCEPT_QUAL>
463 : public true_type { };
464
465 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
466 struct is_function<_Res(_ArgTypes...) && _GLIBCXX_NOEXCEPT_QUAL>
467 : public true_type { };
468
469 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
470 struct is_function<_Res(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL>
471 : public true_type { };
472
473 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
474 struct is_function<_Res(_ArgTypes......) & _GLIBCXX_NOEXCEPT_QUAL>
475 : public true_type { };
476
477 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
478 struct is_function<_Res(_ArgTypes......) && _GLIBCXX_NOEXCEPT_QUAL>
479 : public true_type { };
480
481 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
482 struct is_function<_Res(_ArgTypes...) const _GLIBCXX_NOEXCEPT_QUAL>
483 : public true_type { };
484
485 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
486 struct is_function<_Res(_ArgTypes...) const & _GLIBCXX_NOEXCEPT_QUAL>
487 : public true_type { };
488
489 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
490 struct is_function<_Res(_ArgTypes...) const && _GLIBCXX_NOEXCEPT_QUAL>
491 : public true_type { };
492
493 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
494 struct is_function<_Res(_ArgTypes......) const _GLIBCXX_NOEXCEPT_QUAL>
495 : public true_type { };
496
497 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
498 struct is_function<_Res(_ArgTypes......) const & _GLIBCXX_NOEXCEPT_QUAL>
499 : public true_type { };
500
501 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
502 struct is_function<_Res(_ArgTypes......) const && _GLIBCXX_NOEXCEPT_QUAL>
503 : public true_type { };
504
505 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
506 struct is_function<_Res(_ArgTypes...) volatile _GLIBCXX_NOEXCEPT_QUAL>
507 : public true_type { };
508
509 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
510 struct is_function<_Res(_ArgTypes...) volatile & _GLIBCXX_NOEXCEPT_QUAL>
511 : public true_type { };
512
513 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
514 struct is_function<_Res(_ArgTypes...) volatile && _GLIBCXX_NOEXCEPT_QUAL>
515 : public true_type { };
516
517 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
518 struct is_function<_Res(_ArgTypes......) volatile _GLIBCXX_NOEXCEPT_QUAL>
519 : public true_type { };
520
521 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
522 struct is_function<_Res(_ArgTypes......) volatile & _GLIBCXX_NOEXCEPT_QUAL>
523 : public true_type { };
524
525 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
526 struct is_function<_Res(_ArgTypes......) volatile && _GLIBCXX_NOEXCEPT_QUAL>
527 : public true_type { };
528
529 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
530 struct is_function<_Res(_ArgTypes...) const volatile _GLIBCXX_NOEXCEPT_QUAL>
531 : public true_type { };
532
533 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
534 struct is_function<_Res(_ArgTypes...) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
535 : public true_type { };
536
537 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
538 struct is_function<_Res(_ArgTypes...) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
539 : public true_type { };
540
541 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
542 struct is_function<_Res(_ArgTypes......) const volatile _GLIBCXX_NOEXCEPT_QUAL>
543 : public true_type { };
544
545 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
546 struct is_function<_Res(_ArgTypes......) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
547 : public true_type { };
548
549 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
550 struct is_function<_Res(_ArgTypes......) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
551 : public true_type { };
552
553#define __cpp_lib_is_null_pointer 201309
554
555 template<typename>
556 struct __is_null_pointer_helper
557 : public false_type { };
558
559 template<>
560 struct __is_null_pointer_helper<std::nullptr_t>
561 : public true_type { };
562
563 /// is_null_pointer (LWG 2247).
564 template<typename _Tp>
565 struct is_null_pointer
566 : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type
567 { };
568
569 /// __is_nullptr_t (extension).
570 template<typename _Tp>
571 struct __is_nullptr_t
572 : public is_null_pointer<_Tp>
573 { };
574
575 // Composite type categories.
576
577 /// is_reference
578 template<typename _Tp>
579 struct is_reference
580 : public __or_<is_lvalue_reference<_Tp>,
581 is_rvalue_reference<_Tp>>::type
582 { };
583
584 /// is_arithmetic
585 template<typename _Tp>
586 struct is_arithmetic
587 : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
588 { };
589
590 /// is_fundamental
591 template<typename _Tp>
592 struct is_fundamental
593 : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
594 is_null_pointer<_Tp>>::type
595 { };
596
597 /// is_object
598 template<typename _Tp>
599 struct is_object
600 : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
601 is_void<_Tp>>>::type
602 { };
603
604 template<typename>
605 struct is_member_pointer;
606
607 /// is_scalar
608 template<typename _Tp>
609 struct is_scalar
610 : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
611 is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
612 { };
613
614 /// is_compound
615 template<typename _Tp>
616 struct is_compound
617 : public __not_<is_fundamental<_Tp>>::type { };
618
619 template<typename _Tp>
620 struct __is_member_pointer_helper
621 : public false_type { };
622
623 template<typename _Tp, typename _Cp>
624 struct __is_member_pointer_helper<_Tp _Cp::*>
625 : public true_type { };
626
627 /// is_member_pointer
628 template<typename _Tp>
629 struct is_member_pointer
630 : public __is_member_pointer_helper<typename remove_cv<_Tp>::type>::type
631 { };
632
633 // Utility to detect referenceable types ([defns.referenceable]).
634
635 template<typename _Tp>
636 struct __is_referenceable
637 : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
638 { };
639
640 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
641 struct __is_referenceable<_Res(_Args...) _GLIBCXX_NOEXCEPT_QUAL>
642 : public true_type
643 { };
644
645 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
646 struct __is_referenceable<_Res(_Args......) _GLIBCXX_NOEXCEPT_QUAL>
647 : public true_type
648 { };
649
650 // Type properties.
651
652 /// is_const
653 template<typename>
654 struct is_const
655 : public false_type { };
656
657 template<typename _Tp>
658 struct is_const<_Tp const>
659 : public true_type { };
660
661 /// is_volatile
662 template<typename>
663 struct is_volatile
664 : public false_type { };
665
666 template<typename _Tp>
667 struct is_volatile<_Tp volatile>
668 : public true_type { };
669
670 /// is_trivial
671 template<typename _Tp>
672 struct is_trivial
673 : public integral_constant<bool, __is_trivial(_Tp)>
674 { };
675
676 // is_trivially_copyable
677 template<typename _Tp>
678 struct is_trivially_copyable
679 : public integral_constant<bool, __is_trivially_copyable(_Tp)>
680 { };
681
682 /// is_standard_layout
683 template<typename _Tp>
684 struct is_standard_layout
685 : public integral_constant<bool, __is_standard_layout(_Tp)>
686 { };
687
688 /// is_pod
689 // Could use is_standard_layout && is_trivial instead of the builtin.
690 template<typename _Tp>
691 struct is_pod
692 : public integral_constant<bool, __is_pod(_Tp)>
693 { };
694
695 /// is_literal_type
696 template<typename _Tp>
697 struct is_literal_type
698 : public integral_constant<bool, __is_literal_type(_Tp)>
699 { };
700
701 /// is_empty
702 template<typename _Tp>
703 struct is_empty
704 : public integral_constant<bool, __is_empty(_Tp)>
705 { };
706
707 /// is_polymorphic
708 template<typename _Tp>
709 struct is_polymorphic
710 : public integral_constant<bool, __is_polymorphic(_Tp)>
711 { };
712
713#if __cplusplus >= 201402L
714#define __cpp_lib_is_final 201402L
715 /// is_final
716 template<typename _Tp>
717 struct is_final
718 : public integral_constant<bool, __is_final(_Tp)>
719 { };
720#endif
721
722 /// is_abstract
723 template<typename _Tp>
724 struct is_abstract
725 : public integral_constant<bool, __is_abstract(_Tp)>
726 { };
727
728 template<typename _Tp,
729 bool = is_arithmetic<_Tp>::value>
730 struct __is_signed_helper
731 : public false_type { };
732
733 template<typename _Tp>
734 struct __is_signed_helper<_Tp, true>
735 : public integral_constant<bool, _Tp(-1) < _Tp(0)>
736 { };
737
738 /// is_signed
739 template<typename _Tp>
740 struct is_signed
741 : public __is_signed_helper<_Tp>::type
742 { };
743
744 /// is_unsigned
745 template<typename _Tp>
746 struct is_unsigned
747 : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
748 { };
749
750
751 // Destructible and constructible type properties.
752
753 /**
754 * @brief Utility to simplify expressions used in unevaluated operands
755 * @ingroup utilities
756 */
757
758 template<typename _Tp, typename _Up = _Tp&&>
759 _Up
760 __declval(int);
761
762 template<typename _Tp>
763 _Tp
764 __declval(long);
765
766 template<typename _Tp>
767 auto declval() noexcept -> decltype(__declval<_Tp>(0));
768
769 template<typename, unsigned = 0>
770 struct extent;
771
772 template<typename>
773 struct remove_all_extents;
774
775 template<typename _Tp>
776 struct __is_array_known_bounds
777 : public integral_constant<bool, (extent<_Tp>::value > 0)>
778 { };
779
780 template<typename _Tp>
781 struct __is_array_unknown_bounds
782 : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
783 { };
784
785 // In N3290 is_destructible does not say anything about function
786 // types and abstract types, see LWG 2049. This implementation
787 // describes function types as non-destructible and all complete
788 // object types as destructible, iff the explicit destructor
789 // call expression is wellformed.
790 struct __do_is_destructible_impl
791 {
792 template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
793 static true_type __test(int);
794
795 template<typename>
796 static false_type __test(...);
797 };
798
799 template<typename _Tp>
800 struct __is_destructible_impl
801 : public __do_is_destructible_impl
802 {
803 typedef decltype(__test<_Tp>(0)) type;
804 };
805
806 template<typename _Tp,
807 bool = __or_<is_void<_Tp>,
808 __is_array_unknown_bounds<_Tp>,
809 is_function<_Tp>>::value,
810 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
811 struct __is_destructible_safe;
812
813 template<typename _Tp>
814 struct __is_destructible_safe<_Tp, false, false>
815 : public __is_destructible_impl<typename
816 remove_all_extents<_Tp>::type>::type
817 { };
818
819 template<typename _Tp>
820 struct __is_destructible_safe<_Tp, true, false>
821 : public false_type { };
822
823 template<typename _Tp>
824 struct __is_destructible_safe<_Tp, false, true>
825 : public true_type { };
826
827 /// is_destructible
828 template<typename _Tp>
829 struct is_destructible
830 : public __is_destructible_safe<_Tp>::type
831 { };
832
833 // is_nothrow_destructible requires that is_destructible is
834 // satisfied as well. We realize that by mimicing the
835 // implementation of is_destructible but refer to noexcept(expr)
836 // instead of decltype(expr).
837 struct __do_is_nt_destructible_impl
838 {
839 template<typename _Tp>
840 static __bool_constant<noexcept(declval<_Tp&>().~_Tp())>
841 __test(int);
842
843 template<typename>
844 static false_type __test(...);
845 };
846
847 template<typename _Tp>
848 struct __is_nt_destructible_impl
849 : public __do_is_nt_destructible_impl
850 {
851 typedef decltype(__test<_Tp>(0)) type;
852 };
853
854 template<typename _Tp,
855 bool = __or_<is_void<_Tp>,
856 __is_array_unknown_bounds<_Tp>,
857 is_function<_Tp>>::value,
858 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
859 struct __is_nt_destructible_safe;
860
861 template<typename _Tp>
862 struct __is_nt_destructible_safe<_Tp, false, false>
863 : public __is_nt_destructible_impl<typename
864 remove_all_extents<_Tp>::type>::type
865 { };
866
867 template<typename _Tp>
868 struct __is_nt_destructible_safe<_Tp, true, false>
869 : public false_type { };
870
871 template<typename _Tp>
872 struct __is_nt_destructible_safe<_Tp, false, true>
873 : public true_type { };
874
875 /// is_nothrow_destructible
876 template<typename _Tp>
877 struct is_nothrow_destructible
878 : public __is_nt_destructible_safe<_Tp>::type
879 { };
880
881 /// is_constructible
882 template<typename _Tp, typename... _Args>
883 struct is_constructible
884 : public __bool_constant<__is_constructible(_Tp, _Args...)>
885 { };
886
887 /// is_default_constructible
888 template<typename _Tp>
889 struct is_default_constructible
890 : public is_constructible<_Tp>::type
891 { };
892
893 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
894 struct __is_copy_constructible_impl;
895
896 template<typename _Tp>
897 struct __is_copy_constructible_impl<_Tp, false>
898 : public false_type { };
899
900 template<typename _Tp>
901 struct __is_copy_constructible_impl<_Tp, true>
902 : public is_constructible<_Tp, const _Tp&>
903 { };
904
905 /// is_copy_constructible
906 template<typename _Tp>
907 struct is_copy_constructible
908 : public __is_copy_constructible_impl<_Tp>
909 { };
910
911 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
912 struct __is_move_constructible_impl;
913
914 template<typename _Tp>
915 struct __is_move_constructible_impl<_Tp, false>
916 : public false_type { };
917
918 template<typename _Tp>
919 struct __is_move_constructible_impl<_Tp, true>
920 : public is_constructible<_Tp, _Tp&&>
921 { };
922
923 /// is_move_constructible
924 template<typename _Tp>
925 struct is_move_constructible
926 : public __is_move_constructible_impl<_Tp>
927 { };
928
929 template<typename _Tp>
930 struct __is_nt_default_constructible_atom
931 : public integral_constant<bool, noexcept(_Tp())>
932 { };
933
934 template<typename _Tp, bool = is_array<_Tp>::value>
935 struct __is_nt_default_constructible_impl;
936
937 template<typename _Tp>
938 struct __is_nt_default_constructible_impl<_Tp, true>
939 : public __and_<__is_array_known_bounds<_Tp>,
940 __is_nt_default_constructible_atom<typename
941 remove_all_extents<_Tp>::type>>
942 { };
943
944 template<typename _Tp>
945 struct __is_nt_default_constructible_impl<_Tp, false>
946 : public __is_nt_default_constructible_atom<_Tp>
947 { };
948
949 /// is_nothrow_default_constructible
950 template<typename _Tp>
951 struct is_nothrow_default_constructible
952 : public __and_<is_default_constructible<_Tp>,
953 __is_nt_default_constructible_impl<_Tp>>
954 { };
955
956 template<typename _Tp, typename... _Args>
957 struct __is_nt_constructible_impl
958 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
959 { };
960
961 template<typename _Tp, typename _Arg>
962 struct __is_nt_constructible_impl<_Tp, _Arg>
963 : public integral_constant<bool,
964 noexcept(static_cast<_Tp>(declval<_Arg>()))>
965 { };
966
967 template<typename _Tp>
968 struct __is_nt_constructible_impl<_Tp>
969 : public is_nothrow_default_constructible<_Tp>
970 { };
971
972 /// is_nothrow_constructible
973 template<typename _Tp, typename... _Args>
974 struct is_nothrow_constructible
975 : public __and_<is_constructible<_Tp, _Args...>,
976 __is_nt_constructible_impl<_Tp, _Args...>>
977 { };
978
979 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
980 struct __is_nothrow_copy_constructible_impl;
981
982 template<typename _Tp>
983 struct __is_nothrow_copy_constructible_impl<_Tp, false>
984 : public false_type { };
985
986 template<typename _Tp>
987 struct __is_nothrow_copy_constructible_impl<_Tp, true>
988 : public is_nothrow_constructible<_Tp, const _Tp&>
989 { };
990
991 /// is_nothrow_copy_constructible
992 template<typename _Tp>
993 struct is_nothrow_copy_constructible
994 : public __is_nothrow_copy_constructible_impl<_Tp>
995 { };
996
997 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
998 struct __is_nothrow_move_constructible_impl;
999
1000 template<typename _Tp>
1001 struct __is_nothrow_move_constructible_impl<_Tp, false>
1002 : public false_type { };
1003
1004 template<typename _Tp>
1005 struct __is_nothrow_move_constructible_impl<_Tp, true>
1006 : public is_nothrow_constructible<_Tp, _Tp&&>
1007 { };
1008
1009 /// is_nothrow_move_constructible
1010 template<typename _Tp>
1011 struct is_nothrow_move_constructible
1012 : public __is_nothrow_move_constructible_impl<_Tp>
1013 { };
1014
1015 /// is_assignable
1016 template<typename _Tp, typename _Up>
1017 struct is_assignable
1018 : public __bool_constant<__is_assignable(_Tp, _Up)>
1019 { };
1020
1021 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1022 struct __is_copy_assignable_impl;
1023
1024 template<typename _Tp>
1025 struct __is_copy_assignable_impl<_Tp, false>
1026 : public false_type { };
1027
1028 template<typename _Tp>
1029 struct __is_copy_assignable_impl<_Tp, true>
1030 : public is_assignable<_Tp&, const _Tp&>
1031 { };
1032
1033 /// is_copy_assignable
1034 template<typename _Tp>
1035 struct is_copy_assignable
1036 : public __is_copy_assignable_impl<_Tp>
1037 { };
1038
1039 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1040 struct __is_move_assignable_impl;
1041
1042 template<typename _Tp>
1043 struct __is_move_assignable_impl<_Tp, false>
1044 : public false_type { };
1045
1046 template<typename _Tp>
1047 struct __is_move_assignable_impl<_Tp, true>
1048 : public is_assignable<_Tp&, _Tp&&>
1049 { };
1050
1051 /// is_move_assignable
1052 template<typename _Tp>
1053 struct is_move_assignable
1054 : public __is_move_assignable_impl<_Tp>
1055 { };
1056
1057 template<typename _Tp, typename _Up>
1058 struct __is_nt_assignable_impl
1059 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1060 { };
1061
1062 /// is_nothrow_assignable
1063 template<typename _Tp, typename _Up>
1064 struct is_nothrow_assignable
1065 : public __and_<is_assignable<_Tp, _Up>,
1066 __is_nt_assignable_impl<_Tp, _Up>>
1067 { };
1068
1069 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1070 struct __is_nt_copy_assignable_impl;
1071
1072 template<typename _Tp>
1073 struct __is_nt_copy_assignable_impl<_Tp, false>
1074 : public false_type { };
1075
1076 template<typename _Tp>
1077 struct __is_nt_copy_assignable_impl<_Tp, true>
1078 : public is_nothrow_assignable<_Tp&, const _Tp&>
1079 { };
1080
1081 /// is_nothrow_copy_assignable
1082 template<typename _Tp>
1083 struct is_nothrow_copy_assignable
1084 : public __is_nt_copy_assignable_impl<_Tp>
1085 { };
1086
1087 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1088 struct __is_nt_move_assignable_impl;
1089
1090 template<typename _Tp>
1091 struct __is_nt_move_assignable_impl<_Tp, false>
1092 : public false_type { };
1093
1094 template<typename _Tp>
1095 struct __is_nt_move_assignable_impl<_Tp, true>
1096 : public is_nothrow_assignable<_Tp&, _Tp&&>
1097 { };
1098
1099 /// is_nothrow_move_assignable
1100 template<typename _Tp>
1101 struct is_nothrow_move_assignable
1102 : public __is_nt_move_assignable_impl<_Tp>
1103 { };
1104
1105 /// is_trivially_constructible
1106 template<typename _Tp, typename... _Args>
1107 struct is_trivially_constructible
1108 : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
1109 { };
1110
1111 /// is_trivially_default_constructible
1112 template<typename _Tp>
1113 struct is_trivially_default_constructible
1114 : public is_trivially_constructible<_Tp>::type
1115 { };
1116
1117 struct __do_is_implicitly_default_constructible_impl
1118 {
1119 template <typename _Tp>
1120 static void __helper(const _Tp&);
1121
1122 template <typename _Tp>
1123 static true_type __test(const _Tp&,
1124 decltype(__helper<const _Tp&>({}))* = 0);
1125
1126 static false_type __test(...);
1127 };
1128
1129 template<typename _Tp>
1130 struct __is_implicitly_default_constructible_impl
1131 : public __do_is_implicitly_default_constructible_impl
1132 {
1133 typedef decltype(__test(declval<_Tp>())) type;
1134 };
1135
1136 template<typename _Tp>
1137 struct __is_implicitly_default_constructible_safe
1138 : public __is_implicitly_default_constructible_impl<_Tp>::type
1139 { };
1140
1141 template <typename _Tp>
1142 struct __is_implicitly_default_constructible
1143 : public __and_<is_default_constructible<_Tp>,
1144 __is_implicitly_default_constructible_safe<_Tp>>
1145 { };
1146
1147 /// is_trivially_copy_constructible
1148
1149 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1150 struct __is_trivially_copy_constructible_impl;
1151
1152 template<typename _Tp>
1153 struct __is_trivially_copy_constructible_impl<_Tp, false>
1154 : public false_type { };
1155
1156 template<typename _Tp>
1157 struct __is_trivially_copy_constructible_impl<_Tp, true>
1158 : public __and_<is_copy_constructible<_Tp>,
1159 integral_constant<bool,
1160 __is_trivially_constructible(_Tp, const _Tp&)>>
1161 { };
1162
1163 template<typename _Tp>
1164 struct is_trivially_copy_constructible
1165 : public __is_trivially_copy_constructible_impl<_Tp>
1166 { };
1167
1168 /// is_trivially_move_constructible
1169
1170 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1171 struct __is_trivially_move_constructible_impl;
1172
1173 template<typename _Tp>
1174 struct __is_trivially_move_constructible_impl<_Tp, false>
1175 : public false_type { };
1176
1177 template<typename _Tp>
1178 struct __is_trivially_move_constructible_impl<_Tp, true>
1179 : public __and_<is_move_constructible<_Tp>,
1180 integral_constant<bool,
1181 __is_trivially_constructible(_Tp, _Tp&&)>>
1182 { };
1183
1184 template<typename _Tp>
1185 struct is_trivially_move_constructible
1186 : public __is_trivially_move_constructible_impl<_Tp>
1187 { };
1188
1189 /// is_trivially_assignable
1190 template<typename _Tp, typename _Up>
1191 struct is_trivially_assignable
1192 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1193 { };
1194
1195 /// is_trivially_copy_assignable
1196
1197 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1198 struct __is_trivially_copy_assignable_impl;
1199
1200 template<typename _Tp>
1201 struct __is_trivially_copy_assignable_impl<_Tp, false>
1202 : public false_type { };
1203
1204 template<typename _Tp>
1205 struct __is_trivially_copy_assignable_impl<_Tp, true>
1206 : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
1207 { };
1208
1209 template<typename _Tp>
1210 struct is_trivially_copy_assignable
1211 : public __is_trivially_copy_assignable_impl<_Tp>
1212 { };
1213
1214 /// is_trivially_move_assignable
1215
1216 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1217 struct __is_trivially_move_assignable_impl;
1218
1219 template<typename _Tp>
1220 struct __is_trivially_move_assignable_impl<_Tp, false>
1221 : public false_type { };
1222
1223 template<typename _Tp>
1224 struct __is_trivially_move_assignable_impl<_Tp, true>
1225 : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
1226 { };
1227
1228 template<typename _Tp>
1229 struct is_trivially_move_assignable
1230 : public __is_trivially_move_assignable_impl<_Tp>
1231 { };
1232
1233 /// is_trivially_destructible
1234 template<typename _Tp>
1235 struct is_trivially_destructible
1236 : public __and_<is_destructible<_Tp>,
1237 __bool_constant<__has_trivial_destructor(_Tp)>>
1238 { };
1239
1240
1241 /// has_virtual_destructor
1242 template<typename _Tp>
1243 struct has_virtual_destructor
1244 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1245 { };
1246
1247
1248 // type property queries.
1249
1250 /// alignment_of
1251 template<typename _Tp>
1252 struct alignment_of
1253 : public integral_constant<std::size_t, alignof(_Tp)> { };
1254
1255 /// rank
1256 template<typename>
1257 struct rank
1258 : public integral_constant<std::size_t, 0> { };
1259
1260 template<typename _Tp, std::size_t _Size>
1261 struct rank<_Tp[_Size]>
1262 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1263
1264 template<typename _Tp>
1265 struct rank<_Tp[]>
1266 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1267
1268 /// extent
1269 template<typename, unsigned _Uint>
1270 struct extent
1271 : public integral_constant<std::size_t, 0> { };
1272
1273 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1274 struct extent<_Tp[_Size], _Uint>
1275 : public integral_constant<std::size_t,
1276 _Uint == 0 ? _Size : extent<_Tp,
1277 _Uint - 1>::value>
1278 { };
1279
1280 template<typename _Tp, unsigned _Uint>
1281 struct extent<_Tp[], _Uint>
1282 : public integral_constant<std::size_t,
1283 _Uint == 0 ? 0 : extent<_Tp,
1284 _Uint - 1>::value>
1285 { };
1286
1287
1288 // Type relations.
1289
1290 /// is_same
1291 template<typename, typename>
1292 struct is_same
1293 : public false_type { };
1294
1295 template<typename _Tp>
1296 struct is_same<_Tp, _Tp>
1297 : public true_type { };
1298
1299 /// is_base_of
1300 template<typename _Base, typename _Derived>
1301 struct is_base_of
1302 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1303 { };
1304
1305 template<typename _From, typename _To,
1306 bool = __or_<is_void<_From>, is_function<_To>,
1307 is_array<_To>>::value>
1308 struct __is_convertible_helper
1309 {
1310 typedef typename is_void<_To>::type type;
1311 };
1312
1313 template<typename _From, typename _To>
1314 class __is_convertible_helper<_From, _To, false>
1315 {
1316 template<typename _To1>
1317 static void __test_aux(_To1) noexcept;
1318
1319 template<typename _From1, typename _To1,
1320 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1321 static true_type
1322 __test(int);
1323
1324 template<typename, typename>
1325 static false_type
1326 __test(...);
1327
1328 public:
1329 typedef decltype(__test<_From, _To>(0)) type;
1330 };
1331
1332
1333 /// is_convertible
1334 template<typename _From, typename _To>
1335 struct is_convertible
1336 : public __is_convertible_helper<_From, _To>::type
1337 { };
1338
1339#if __cplusplus > 201703L
1340 template<typename _From, typename _To,
1341 bool = __or_<is_void<_From>, is_function<_To>,
1342 is_array<_To>>::value>
1343 struct __is_nt_convertible_helper
1344 : is_void<_To>
1345 { };
1346
1347 template<typename _From, typename _To>
1348 class __is_nt_convertible_helper<_From, _To, false>
1349 {
1350 template<typename _To1>
1351 static void __test_aux(_To1) noexcept;
1352
1353 template<typename _From1, typename _To1>
1354 static bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
1355 __test(int);
1356
1357 template<typename, typename>
1358 static false_type
1359 __test(...);
1360
1361 public:
1362 using type = decltype(__test<_From, _To>(0));
1363 };
1364
1365#define __cpp_lib_is_nothrow_convertible 201806L
1366 /// is_nothrow_convertible
1367 template<typename _From, typename _To>
1368 struct is_nothrow_convertible
1369 : public __is_nt_convertible_helper<_From, _To>::type
1370 { };
1371
1372 /// is_nothrow_convertible_v
1373 template<typename _From, typename _To>
1374 inline constexpr bool is_nothrow_convertible_v
1375 = is_nothrow_convertible<_From, _To>::value;
1376#endif // C++2a
1377
1378 // Const-volatile modifications.
1379
1380 /// remove_const
1381 template<typename _Tp>
1382 struct remove_const
1383 { typedef _Tp type; };
1384
1385 template<typename _Tp>
1386 struct remove_const<_Tp const>
1387 { typedef _Tp type; };
1388
1389 /// remove_volatile
1390 template<typename _Tp>
1391 struct remove_volatile
1392 { typedef _Tp type; };
1393
1394 template<typename _Tp>
1395 struct remove_volatile<_Tp volatile>
1396 { typedef _Tp type; };
1397
1398 /// remove_cv
1399 template<typename _Tp>
1400 struct remove_cv
1401 {
1402 typedef typename
1403 remove_const<typename remove_volatile<_Tp>::type>::type type;
1404 };
1405
1406 /// add_const
1407 template<typename _Tp>
1408 struct add_const
1409 { typedef _Tp const type; };
1410
1411 /// add_volatile
1412 template<typename _Tp>
1413 struct add_volatile
1414 { typedef _Tp volatile type; };
1415
1416 /// add_cv
1417 template<typename _Tp>
1418 struct add_cv
1419 {
1420 typedef typename
1421 add_const<typename add_volatile<_Tp>::type>::type type;
1422 };
1423
1424#if __cplusplus > 201103L
1425
1426#define __cpp_lib_transformation_trait_aliases 201304
1427
1428 /// Alias template for remove_const
1429 template<typename _Tp>
1430 using remove_const_t = typename remove_const<_Tp>::type;
1431
1432 /// Alias template for remove_volatile
1433 template<typename _Tp>
1434 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1435
1436 /// Alias template for remove_cv
1437 template<typename _Tp>
1438 using remove_cv_t = typename remove_cv<_Tp>::type;
1439
1440 /// Alias template for add_const
1441 template<typename _Tp>
1442 using add_const_t = typename add_const<_Tp>::type;
1443
1444 /// Alias template for add_volatile
1445 template<typename _Tp>
1446 using add_volatile_t = typename add_volatile<_Tp>::type;
1447
1448 /// Alias template for add_cv
1449 template<typename _Tp>
1450 using add_cv_t = typename add_cv<_Tp>::type;
1451#endif
1452
1453 // Reference transformations.
1454
1455 /// remove_reference
1456 template<typename _Tp>
1457 struct remove_reference
1458 { typedef _Tp type; };
1459
1460 template<typename _Tp>
1461 struct remove_reference<_Tp&>
1462 { typedef _Tp type; };
1463
1464 template<typename _Tp>
1465 struct remove_reference<_Tp&&>
1466 { typedef _Tp type; };
1467
1468 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1469 struct __add_lvalue_reference_helper
1470 { typedef _Tp type; };
1471
1472 template<typename _Tp>
1473 struct __add_lvalue_reference_helper<_Tp, true>
1474 { typedef _Tp& type; };
1475
1476 /// add_lvalue_reference
1477 template<typename _Tp>
1478 struct add_lvalue_reference
1479 : public __add_lvalue_reference_helper<_Tp>
1480 { };
1481
1482 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1483 struct __add_rvalue_reference_helper
1484 { typedef _Tp type; };
1485
1486 template<typename _Tp>
1487 struct __add_rvalue_reference_helper<_Tp, true>
1488 { typedef _Tp&& type; };
1489
1490 /// add_rvalue_reference
1491 template<typename _Tp>
1492 struct add_rvalue_reference
1493 : public __add_rvalue_reference_helper<_Tp>
1494 { };
1495
1496#if __cplusplus > 201103L
1497 /// Alias template for remove_reference
1498 template<typename _Tp>
1499 using remove_reference_t = typename remove_reference<_Tp>::type;
1500
1501 /// Alias template for add_lvalue_reference
1502 template<typename _Tp>
1503 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1504
1505 /// Alias template for add_rvalue_reference
1506 template<typename _Tp>
1507 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1508#endif
1509
1510 // Sign modifications.
1511
1512 // Utility for constructing identically cv-qualified types.
1513 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1514 struct __cv_selector;
1515
1516 template<typename _Unqualified>
1517 struct __cv_selector<_Unqualified, false, false>
1518 { typedef _Unqualified __type; };
1519
1520 template<typename _Unqualified>
1521 struct __cv_selector<_Unqualified, false, true>
1522 { typedef volatile _Unqualified __type; };
1523
1524 template<typename _Unqualified>
1525 struct __cv_selector<_Unqualified, true, false>
1526 { typedef const _Unqualified __type; };
1527
1528 template<typename _Unqualified>
1529 struct __cv_selector<_Unqualified, true, true>
1530 { typedef const volatile _Unqualified __type; };
1531
1532 template<typename _Qualified, typename _Unqualified,
1533 bool _IsConst = is_const<_Qualified>::value,
1534 bool _IsVol = is_volatile<_Qualified>::value>
1535 class __match_cv_qualifiers
1536 {
1537 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1538
1539 public:
1540 typedef typename __match::__type __type;
1541 };
1542
1543 // Utility for finding the unsigned versions of signed integral types.
1544 template<typename _Tp>
1545 struct __make_unsigned
1546 { typedef _Tp __type; };
1547
1548 template<>
1549 struct __make_unsigned<char>
1550 { typedef unsigned char __type; };
1551
1552 template<>
1553 struct __make_unsigned<signed char>
1554 { typedef unsigned char __type; };
1555
1556 template<>
1557 struct __make_unsigned<short>
1558 { typedef unsigned short __type; };
1559
1560 template<>
1561 struct __make_unsigned<int>
1562 { typedef unsigned int __type; };
1563
1564 template<>
1565 struct __make_unsigned<long>
1566 { typedef unsigned long __type; };
1567
1568 template<>
1569 struct __make_unsigned<long long>
1570 { typedef unsigned long long __type; };
1571
1572#if defined(__GLIBCXX_TYPE_INT_N_0)
1573 template<>
1574 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1575 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1576#endif
1577#if defined(__GLIBCXX_TYPE_INT_N_1)
1578 template<>
1579 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1580 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1581#endif
1582#if defined(__GLIBCXX_TYPE_INT_N_2)
1583 template<>
1584 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1585 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1586#endif
1587#if defined(__GLIBCXX_TYPE_INT_N_3)
1588 template<>
1589 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1590 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1591#endif
1592
1593 // Select between integral and enum: not possible to be both.
1594 template<typename _Tp,
1595 bool _IsInt = is_integral<_Tp>::value,
1596 bool _IsEnum = is_enum<_Tp>::value>
1597 class __make_unsigned_selector;
1598
1599 template<typename _Tp>
1600 class __make_unsigned_selector<_Tp, true, false>
1601 {
1602 using __unsigned_type
1603 = typename __make_unsigned<typename remove_cv<_Tp>::type>::__type;
1604
1605 public:
1606 using __type
1607 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1608 };
1609
1610 class __make_unsigned_selector_base
1611 {
1612 protected:
1613 template<typename...> struct _List { };
1614
1615 template<typename _Tp, typename... _Up>
1616 struct _List<_Tp, _Up...> : _List<_Up...>
1617 { static constexpr size_t __size = sizeof(_Tp); };
1618
1619 template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
1620 struct __select;
1621
1622 template<size_t _Sz, typename _Uint, typename... _UInts>
1623 struct __select<_Sz, _List<_Uint, _UInts...>, true>
1624 { using __type = _Uint; };
1625
1626 template<size_t _Sz, typename _Uint, typename... _UInts>
1627 struct __select<_Sz, _List<_Uint, _UInts...>, false>
1628 : __select<_Sz, _List<_UInts...>>
1629 { };
1630 };
1631
1632 // Choose unsigned integer type with the smallest rank and same size as _Tp
1633 template<typename _Tp>
1634 class __make_unsigned_selector<_Tp, false, true>
1635 : __make_unsigned_selector_base
1636 {
1637 // With -fshort-enums, an enum may be as small as a char.
1638 using _UInts = _List<unsigned char, unsigned short, unsigned int,
1639 unsigned long, unsigned long long>;
1640
1641 using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
1642
1643 public:
1644 using __type
1645 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1646 };
1647
1648 // wchar_t, char8_t, char16_t and char32_t are integral types but are
1649 // neither signed integer types nor unsigned integer types, so must be
1650 // transformed to the unsigned integer type with the smallest rank.
1651 // Use the partial specialization for enumeration types to do that.
1652#if defined(_GLIBCXX_USE_WCHAR_T)
1653 template<>
1654 struct __make_unsigned<wchar_t>
1655 {
1656 using __type
1657 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
1658 };
1659#endif
1660
1661#ifdef _GLIBCXX_USE_CHAR8_T
1662 template<>
1663 struct __make_unsigned<char8_t>
1664 {
1665 using __type
1666 = typename __make_unsigned_selector<char8_t, false, true>::__type;
1667 };
1668#endif
1669
1670 template<>
1671 struct __make_unsigned<char16_t>
1672 {
1673 using __type
1674 = typename __make_unsigned_selector<char16_t, false, true>::__type;
1675 };
1676
1677 template<>
1678 struct __make_unsigned<char32_t>
1679 {
1680 using __type
1681 = typename __make_unsigned_selector<char32_t, false, true>::__type;
1682 };
1683
1684 // Given an integral/enum type, return the corresponding unsigned
1685 // integer type.
1686 // Primary template.
1687 /// make_unsigned
1688 template<typename _Tp>
1689 struct make_unsigned
1690 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1691
1692 // Integral, but don't define.
1693 template<>
1694 struct make_unsigned<bool>;
1695
1696
1697 // Utility for finding the signed versions of unsigned integral types.
1698 template<typename _Tp>
1699 struct __make_signed
1700 { typedef _Tp __type; };
1701
1702 template<>
1703 struct __make_signed<char>
1704 { typedef signed char __type; };
1705
1706 template<>
1707 struct __make_signed<unsigned char>
1708 { typedef signed char __type; };
1709
1710 template<>
1711 struct __make_signed<unsigned short>
1712 { typedef signed short __type; };
1713
1714 template<>
1715 struct __make_signed<unsigned int>
1716 { typedef signed int __type; };
1717
1718 template<>
1719 struct __make_signed<unsigned long>
1720 { typedef signed long __type; };
1721
1722 template<>
1723 struct __make_signed<unsigned long long>
1724 { typedef signed long long __type; };
1725
1726#if defined(__GLIBCXX_TYPE_INT_N_0)
1727 template<>
1728 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1729 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1730#endif
1731#if defined(__GLIBCXX_TYPE_INT_N_1)
1732 template<>
1733 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1734 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1735#endif
1736#if defined(__GLIBCXX_TYPE_INT_N_2)
1737 template<>
1738 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1739 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1740#endif
1741#if defined(__GLIBCXX_TYPE_INT_N_3)
1742 template<>
1743 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1744 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1745#endif
1746
1747 // Select between integral and enum: not possible to be both.
1748 template<typename _Tp,
1749 bool _IsInt = is_integral<_Tp>::value,
1750 bool _IsEnum = is_enum<_Tp>::value>
1751 class __make_signed_selector;
1752
1753 template<typename _Tp>
1754 class __make_signed_selector<_Tp, true, false>
1755 {
1756 using __signed_type
1757 = typename __make_signed<typename remove_cv<_Tp>::type>::__type;
1758
1759 public:
1760 using __type
1761 = typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
1762 };
1763
1764 // Choose signed integer type with the smallest rank and same size as _Tp
1765 template<typename _Tp>
1766 class __make_signed_selector<_Tp, false, true>
1767 {
1768 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1769
1770 public:
1771 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1772 };
1773
1774 // wchar_t, char16_t and char32_t are integral types but are neither
1775 // signed integer types nor unsigned integer types, so must be
1776 // transformed to the signed integer type with the smallest rank.
1777 // Use the partial specialization for enumeration types to do that.
1778#if defined(_GLIBCXX_USE_WCHAR_T)
1779 template<>
1780 struct __make_signed<wchar_t>
1781 {
1782 using __type
1783 = typename __make_signed_selector<wchar_t, false, true>::__type;
1784 };
1785#endif
1786
1787#if defined(_GLIBCXX_USE_CHAR8_T)
1788 template<>
1789 struct __make_signed<char8_t>
1790 {
1791 using __type
1792 = typename __make_signed_selector<char8_t, false, true>::__type;
1793 };
1794#endif
1795
1796 template<>
1797 struct __make_signed<char16_t>
1798 {
1799 using __type
1800 = typename __make_signed_selector<char16_t, false, true>::__type;
1801 };
1802
1803 template<>
1804 struct __make_signed<char32_t>
1805 {
1806 using __type
1807 = typename __make_signed_selector<char32_t, false, true>::__type;
1808 };
1809
1810 // Given an integral/enum type, return the corresponding signed
1811 // integer type.
1812 // Primary template.
1813 /// make_signed
1814 template<typename _Tp>
1815 struct make_signed
1816 { typedef typename __make_signed_selector<_Tp>::__type type; };
1817
1818 // Integral, but don't define.
1819 template<>
1820 struct make_signed<bool>;
1821
1822#if __cplusplus > 201103L
1823 /// Alias template for make_signed
1824 template<typename _Tp>
1825 using make_signed_t = typename make_signed<_Tp>::type;
1826
1827 /// Alias template for make_unsigned
1828 template<typename _Tp>
1829 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1830#endif
1831
1832 // Array modifications.
1833
1834 /// remove_extent
1835 template<typename _Tp>
1836 struct remove_extent
1837 { typedef _Tp type; };
1838
1839 template<typename _Tp, std::size_t _Size>
1840 struct remove_extent<_Tp[_Size]>
1841 { typedef _Tp type; };
1842
1843 template<typename _Tp>
1844 struct remove_extent<_Tp[]>
1845 { typedef _Tp type; };
1846
1847 /// remove_all_extents
1848 template<typename _Tp>
1849 struct remove_all_extents
1850 { typedef _Tp type; };
1851
1852 template<typename _Tp, std::size_t _Size>
1853 struct remove_all_extents<_Tp[_Size]>
1854 { typedef typename remove_all_extents<_Tp>::type type; };
1855
1856 template<typename _Tp>
1857 struct remove_all_extents<_Tp[]>
1858 { typedef typename remove_all_extents<_Tp>::type type; };
1859
1860#if __cplusplus > 201103L
1861 /// Alias template for remove_extent
1862 template<typename _Tp>
1863 using remove_extent_t = typename remove_extent<_Tp>::type;
1864
1865 /// Alias template for remove_all_extents
1866 template<typename _Tp>
1867 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1868#endif
1869
1870 // Pointer modifications.
1871
1872 template<typename _Tp, typename>
1873 struct __remove_pointer_helper
1874 { typedef _Tp type; };
1875
1876 template<typename _Tp, typename _Up>
1877 struct __remove_pointer_helper<_Tp, _Up*>
1878 { typedef _Up type; };
1879
1880 /// remove_pointer
1881 template<typename _Tp>
1882 struct remove_pointer
1883 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1884 { };
1885
1886 /// add_pointer
1887 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1888 is_void<_Tp>>::value>
1889 struct __add_pointer_helper
1890 { typedef _Tp type; };
1891
1892 template<typename _Tp>
1893 struct __add_pointer_helper<_Tp, true>
1894 { typedef typename remove_reference<_Tp>::type* type; };
1895
1896 template<typename _Tp>
1897 struct add_pointer
1898 : public __add_pointer_helper<_Tp>
1899 { };
1900
1901#if __cplusplus > 201103L
1902 /// Alias template for remove_pointer
1903 template<typename _Tp>
1904 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1905
1906 /// Alias template for add_pointer
1907 template<typename _Tp>
1908 using add_pointer_t = typename add_pointer<_Tp>::type;
1909#endif
1910
1911 template<std::size_t _Len>
1912 struct __aligned_storage_msa
1913 {
1914 union __type
1915 {
1916 unsigned char __data[_Len];
1917 struct __attribute__((__aligned__)) { } __align;
1918 };
1919 };
1920
1921 /**
1922 * @brief Alignment type.
1923 *
1924 * The value of _Align is a default-alignment which shall be the
1925 * most stringent alignment requirement for any C++ object type
1926 * whose size is no greater than _Len (3.9). The member typedef
1927 * type shall be a POD type suitable for use as uninitialized
1928 * storage for any object whose size is at most _Len and whose
1929 * alignment is a divisor of _Align.
1930 */
1931 template<std::size_t _Len, std::size_t _Align =
1932 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1933 struct aligned_storage
1934 {
1935 union type
1936 {
1937 unsigned char __data[_Len];
1938 struct __attribute__((__aligned__((_Align)))) { } __align;
1939 };
1940 };
1941
1942 template <typename... _Types>
1943 struct __strictest_alignment
1944 {
1945 static const size_t _S_alignment = 0;
1946 static const size_t _S_size = 0;
1947 };
1948
1949 template <typename _Tp, typename... _Types>
1950 struct __strictest_alignment<_Tp, _Types...>
1951 {
1952 static const size_t _S_alignment =
1953 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1954 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1955 static const size_t _S_size =
1956 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1957 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
1958 };
1959
1960 /**
1961 * @brief Provide aligned storage for types.
1962 *
1963 * [meta.trans.other]
1964 *
1965 * Provides aligned storage for any of the provided types of at
1966 * least size _Len.
1967 *
1968 * @see aligned_storage
1969 */
1970 template <size_t _Len, typename... _Types>
1971 struct aligned_union
1972 {
1973 private:
1974 static_assert(sizeof...(_Types) != 0, "At least one type is required");
1975
1976 using __strictest = __strictest_alignment<_Types...>;
1977 static const size_t _S_len = _Len > __strictest::_S_size
1978 ? _Len : __strictest::_S_size;
1979 public:
1980 /// The value of the strictest alignment of _Types.
1981 static const size_t alignment_value = __strictest::_S_alignment;
1982 /// The storage.
1983 typedef typename aligned_storage<_S_len, alignment_value>::type type;
1984 };
1985
1986 template <size_t _Len, typename... _Types>
1987 const size_t aligned_union<_Len, _Types...>::alignment_value;
1988
1989 // Decay trait for arrays and functions, used for perfect forwarding
1990 // in make_pair, make_tuple, etc.
1991 template<typename _Up,
1992 bool _IsArray = is_array<_Up>::value,
1993 bool _IsFunction = is_function<_Up>::value>
1994 struct __decay_selector;
1995
1996 // NB: DR 705.
1997 template<typename _Up>
1998 struct __decay_selector<_Up, false, false>
1999 { typedef typename remove_cv<_Up>::type __type; };
2000
2001 template<typename _Up>
2002 struct __decay_selector<_Up, true, false>
2003 { typedef typename remove_extent<_Up>::type* __type; };
2004
2005 template<typename _Up>
2006 struct __decay_selector<_Up, false, true>
2007 { typedef typename add_pointer<_Up>::type __type; };
2008
2009 /// decay
2010 template<typename _Tp>
2011 class decay
2012 {
2013 typedef typename remove_reference<_Tp>::type __remove_type;
2014
2015 public:
2016 typedef typename __decay_selector<__remove_type>::__type type;
2017 };
2018
2019 template<typename _Tp>
2020 class reference_wrapper;
2021
2022 // Helper which adds a reference to a type when given a reference_wrapper
2023 template<typename _Tp>
2024 struct __strip_reference_wrapper
2025 {
2026 typedef _Tp __type;
2027 };
2028
2029 template<typename _Tp>
2030 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
2031 {
2032 typedef _Tp& __type;
2033 };
2034
2035 template<typename _Tp>
2036 struct __decay_and_strip
2037 {
2038 typedef typename __strip_reference_wrapper<
2039 typename decay<_Tp>::type>::__type __type;
2040 };
2041
2042
2043 // Primary template.
2044 /// Define a member typedef @c type only if a boolean constant is true.
2045 template<bool, typename _Tp = void>
2046 struct enable_if
2047 { };
2048
2049 // Partial specialization for true.
2050 template<typename _Tp>
2051 struct enable_if<true, _Tp>
2052 { typedef _Tp type; };
2053
2054 template<typename... _Cond>
2055 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
2056
2057 // Primary template.
2058 /// Define a member typedef @c type to one of two argument types.
2059 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2060 struct conditional
2061 { typedef _Iftrue type; };
2062
2063 // Partial specialization for false.
2064 template<typename _Iftrue, typename _Iffalse>
2065 struct conditional<false, _Iftrue, _Iffalse>
2066 { typedef _Iffalse type; };
2067
2068 /// common_type
2069 template<typename... _Tp>
2070 struct common_type;
2071
2072 // Sfinae-friendly common_type implementation:
2073
2074 struct __do_common_type_impl
2075 {
2076 template<typename _Tp, typename _Up>
2077 static __success_type<typename decay<decltype
2078 (true ? std::declval<_Tp>()
2079 : std::declval<_Up>())>::type> _S_test(int);
2080
2081 template<typename, typename>
2082 static __failure_type _S_test(...);
2083 };
2084
2085 template<typename _Tp, typename _Up>
2086 struct __common_type_impl
2087 : private __do_common_type_impl
2088 {
2089 typedef decltype(_S_test<_Tp, _Up>(0)) type;
2090 };
2091
2092 struct __do_member_type_wrapper
2093 {
2094 template<typename _Tp>
2095 static __success_type<typename _Tp::type> _S_test(int);
2096
2097 template<typename>
2098 static __failure_type _S_test(...);
2099 };
2100
2101 template<typename _Tp>
2102 struct __member_type_wrapper
2103 : private __do_member_type_wrapper
2104 {
2105 typedef decltype(_S_test<_Tp>(0)) type;
2106 };
2107
2108 template<typename _CTp, typename... _Args>
2109 struct __expanded_common_type_wrapper
2110 {
2111 typedef common_type<typename _CTp::type, _Args...> type;
2112 };
2113
2114 template<typename... _Args>
2115 struct __expanded_common_type_wrapper<__failure_type, _Args...>
2116 { typedef __failure_type type; };
2117
2118 template<>
2119 struct common_type<>
2120 { };
2121
2122 template<typename _Tp>
2123 struct common_type<_Tp>
2124 : common_type<_Tp, _Tp>
2125 { };
2126
2127 template<typename _Tp, typename _Up>
2128 struct common_type<_Tp, _Up>
2129 : public __common_type_impl<_Tp, _Up>::type
2130 { };
2131
2132 template<typename _Tp, typename _Up, typename... _Vp>
2133 struct common_type<_Tp, _Up, _Vp...>
2134 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
2135 common_type<_Tp, _Up>>::type, _Vp...>::type
2136 { };
2137
2138 template<typename _Tp, bool = is_enum<_Tp>::value>
2139 struct __underlying_type_impl
2140 {
2141 using type = __underlying_type(_Tp);
2142 };
2143
2144 template<typename _Tp>
2145 struct __underlying_type_impl<_Tp, false>
2146 { };
2147
2148 /// The underlying type of an enum.
2149 template<typename _Tp>
2150 struct underlying_type
2151 : public __underlying_type_impl<_Tp>
2152 { };
2153
2154 template<typename _Tp>
2155 struct __declval_protector
2156 {
2157 static const bool __stop = false;
2158 };
2159
2160 template<typename _Tp>
2161 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2162 {
2163 static_assert(__declval_protector<_Tp>::__stop,
2164 "declval() must not be used!");
2165 return __declval<_Tp>(0);
2166 }
2167
2168 // __remove_cvref_t (std::remove_cvref_t for C++11).
2169 template<typename _Tp>
2170 using __remove_cvref_t
2171 = typename remove_cv<typename remove_reference<_Tp>::type>::type;
2172
2173 /// result_of
2174 template<typename _Signature>
2175 class result_of;
2176
2177 // Sfinae-friendly result_of implementation:
2178
2179#define __cpp_lib_result_of_sfinae 201210
2180
2181 struct __invoke_memfun_ref { };
2182 struct __invoke_memfun_deref { };
2183 struct __invoke_memobj_ref { };
2184 struct __invoke_memobj_deref { };
2185 struct __invoke_other { };
2186
2187 // Associate a tag type with a specialization of __success_type.
2188 template<typename _Tp, typename _Tag>
2189 struct __result_of_success : __success_type<_Tp>
2190 { using __invoke_type = _Tag; };
2191
2192 // [func.require] paragraph 1 bullet 1:
2193 struct __result_of_memfun_ref_impl
2194 {
2195 template<typename _Fp, typename _Tp1, typename... _Args>
2196 static __result_of_success<decltype(
2197 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2198 ), __invoke_memfun_ref> _S_test(int);
2199
2200 template<typename...>
2201 static __failure_type _S_test(...);
2202 };
2203
2204 template<typename _MemPtr, typename _Arg, typename... _Args>
2205 struct __result_of_memfun_ref
2206 : private __result_of_memfun_ref_impl
2207 {
2208 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2209 };
2210
2211 // [func.require] paragraph 1 bullet 2:
2212 struct __result_of_memfun_deref_impl
2213 {
2214 template<typename _Fp, typename _Tp1, typename... _Args>
2215 static __result_of_success<decltype(
2216 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2217 ), __invoke_memfun_deref> _S_test(int);
2218
2219 template<typename...>
2220 static __failure_type _S_test(...);
2221 };
2222
2223 template<typename _MemPtr, typename _Arg, typename... _Args>
2224 struct __result_of_memfun_deref
2225 : private __result_of_memfun_deref_impl
2226 {
2227 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2228 };
2229
2230 // [func.require] paragraph 1 bullet 3:
2231 struct __result_of_memobj_ref_impl
2232 {
2233 template<typename _Fp, typename _Tp1>
2234 static __result_of_success<decltype(
2235 std::declval<_Tp1>().*std::declval<_Fp>()
2236 ), __invoke_memobj_ref> _S_test(int);
2237
2238 template<typename, typename>
2239 static __failure_type _S_test(...);
2240 };
2241
2242 template<typename _MemPtr, typename _Arg>
2243 struct __result_of_memobj_ref
2244 : private __result_of_memobj_ref_impl
2245 {
2246 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2247 };
2248
2249 // [func.require] paragraph 1 bullet 4:
2250 struct __result_of_memobj_deref_impl
2251 {
2252 template<typename _Fp, typename _Tp1>
2253 static __result_of_success<decltype(
2254 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2255 ), __invoke_memobj_deref> _S_test(int);
2256
2257 template<typename, typename>
2258 static __failure_type _S_test(...);
2259 };
2260
2261 template<typename _MemPtr, typename _Arg>
2262 struct __result_of_memobj_deref
2263 : private __result_of_memobj_deref_impl
2264 {
2265 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2266 };
2267
2268 template<typename _MemPtr, typename _Arg>
2269 struct __result_of_memobj;
2270
2271 template<typename _Res, typename _Class, typename _Arg>
2272 struct __result_of_memobj<_Res _Class::*, _Arg>
2273 {
2274 typedef __remove_cvref_t<_Arg> _Argval;
2275 typedef _Res _Class::* _MemPtr;
2276 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2277 is_base_of<_Class, _Argval>>::value,
2278 __result_of_memobj_ref<_MemPtr, _Arg>,
2279 __result_of_memobj_deref<_MemPtr, _Arg>
2280 >::type::type type;
2281 };
2282
2283 template<typename _MemPtr, typename _Arg, typename... _Args>
2284 struct __result_of_memfun;
2285
2286 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2287 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2288 {
2289 typedef typename remove_reference<_Arg>::type _Argval;
2290 typedef _Res _Class::* _MemPtr;
2291 typedef typename conditional<is_base_of<_Class, _Argval>::value,
2292 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2293 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2294 >::type::type type;
2295 };
2296
2297 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2298 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2299 // as the object expression
2300
2301 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2302 template<typename _Tp, typename _Up = __remove_cvref_t<_Tp>>
2303 struct __inv_unwrap
2304 {
2305 using type = _Tp;
2306 };
2307
2308 template<typename _Tp, typename _Up>
2309 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2310 {
2311 using type = _Up&;
2312 };
2313
2314 template<bool, bool, typename _Functor, typename... _ArgTypes>
2315 struct __result_of_impl
2316 {
2317 typedef __failure_type type;
2318 };
2319
2320 template<typename _MemPtr, typename _Arg>
2321 struct __result_of_impl<true, false, _MemPtr, _Arg>
2322 : public __result_of_memobj<typename decay<_MemPtr>::type,
2323 typename __inv_unwrap<_Arg>::type>
2324 { };
2325
2326 template<typename _MemPtr, typename _Arg, typename... _Args>
2327 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2328 : public __result_of_memfun<typename decay<_MemPtr>::type,
2329 typename __inv_unwrap<_Arg>::type, _Args...>
2330 { };
2331
2332 // [func.require] paragraph 1 bullet 5:
2333 struct __result_of_other_impl
2334 {
2335 template<typename _Fn, typename... _Args>
2336 static __result_of_success<decltype(
2337 std::declval<_Fn>()(std::declval<_Args>()...)
2338 ), __invoke_other> _S_test(int);
2339
2340 template<typename...>
2341 static __failure_type _S_test(...);
2342 };
2343
2344 template<typename _Functor, typename... _ArgTypes>
2345 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2346 : private __result_of_other_impl
2347 {
2348 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2349 };
2350
2351 // __invoke_result (std::invoke_result for C++11)
2352 template<typename _Functor, typename... _ArgTypes>
2353 struct __invoke_result
2354 : public __result_of_impl<
2355 is_member_object_pointer<
2356 typename remove_reference<_Functor>::type
2357 >::value,
2358 is_member_function_pointer<
2359 typename remove_reference<_Functor>::type
2360 >::value,
2361 _Functor, _ArgTypes...
2362 >::type
2363 { };
2364
2365 template<typename _Functor, typename... _ArgTypes>
2366 struct result_of<_Functor(_ArgTypes...)>
2367 : public __invoke_result<_Functor, _ArgTypes...>
2368 { };
2369
2370#if __cplusplus >= 201402L
2371 /// Alias template for aligned_storage
2372 template<size_t _Len, size_t _Align =
2373 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2374 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2375
2376 template <size_t _Len, typename... _Types>
2377 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2378
2379 /// Alias template for decay
2380 template<typename _Tp>
2381 using decay_t = typename decay<_Tp>::type;
2382
2383 /// Alias template for enable_if
2384 template<bool _Cond, typename _Tp = void>
2385 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2386
2387 /// Alias template for conditional
2388 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2389 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2390
2391 /// Alias template for common_type
2392 template<typename... _Tp>
2393 using common_type_t = typename common_type<_Tp...>::type;
2394
2395 /// Alias template for underlying_type
2396 template<typename _Tp>
2397 using underlying_type_t = typename underlying_type<_Tp>::type;
2398
2399 /// Alias template for result_of
2400 template<typename _Tp>
2401 using result_of_t = typename result_of<_Tp>::type;
2402#endif // C++14
2403
2404 // __enable_if_t (std::enable_if_t for C++11)
2405 template<bool _Cond, typename _Tp = void>
2406 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2407
2408 // __void_t (std::void_t for C++11)
2409 template<typename...> using __void_t = void;
2410
2411#if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2412#define __cpp_lib_void_t 201411
2413 /// A metafunction that always yields void, used for detecting valid types.
2414 template<typename...> using void_t = void;
2415#endif
2416
2417 /// Implementation of the detection idiom (negative case).
2418 template<typename _Default, typename _AlwaysVoid,
2419 template<typename...> class _Op, typename... _Args>
2420 struct __detector
2421 {
2422 using value_t = false_type;
2423 using type = _Default;
2424 };
2425
2426 /// Implementation of the detection idiom (positive case).
2427 template<typename _Default, template<typename...> class _Op,
2428 typename... _Args>
2429 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2430 {
2431 using value_t = true_type;
2432 using type = _Op<_Args...>;
2433 };
2434
2435 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2436 template<typename _Default, template<typename...> class _Op,
2437 typename... _Args>
2438 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2439
2440 // _Op<_Args...> if that is a valid type, otherwise _Default.
2441 template<typename _Default, template<typename...> class _Op,
2442 typename... _Args>
2443 using __detected_or_t
2444 = typename __detected_or<_Default, _Op, _Args...>::type;
2445
2446 /// @} group metaprogramming
2447
2448 /**
2449 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2450 * member type _NTYPE.
2451 */
2452#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2453 template<typename _Tp, typename = __void_t<>> \
2454 struct __has_##_NTYPE \
2455 : false_type \
2456 { }; \
2457 template<typename _Tp> \
2458 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2459 : true_type \
2460 { };
2461
2462 template <typename _Tp>
2463 struct __is_swappable;
2464
2465 template <typename _Tp>
2466 struct __is_nothrow_swappable;
2467
2468 template<typename... _Elements>
2469 class tuple;
2470
2471 template<typename>
2472 struct __is_tuple_like_impl : false_type
2473 { };
2474
2475 template<typename... _Tps>
2476 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2477 { };
2478
2479 // Internal type trait that allows us to sfinae-protect tuple_cat.
2480 template<typename _Tp>
2481 struct __is_tuple_like
2482 : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
2483 { };
2484
2485 template<typename _Tp>
2486 inline
2487 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2488 is_move_constructible<_Tp>,
2489 is_move_assignable<_Tp>>::value>::type
2490 swap(_Tp&, _Tp&)
2491 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2492 is_nothrow_move_assignable<_Tp>>::value);
2493
2494 template<typename _Tp, size_t _Nm>
2495 inline
2496 typename enable_if<__is_swappable<_Tp>::value>::type
2497 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2498 noexcept(__is_nothrow_swappable<_Tp>::value);
2499
2500 namespace __swappable_details {
2501 using std::swap;
2502
2503 struct __do_is_swappable_impl
2504 {
2505 template<typename _Tp, typename
2506 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2507 static true_type __test(int);
2508
2509 template<typename>
2510 static false_type __test(...);
2511 };
2512
2513 struct __do_is_nothrow_swappable_impl
2514 {
2515 template<typename _Tp>
2516 static __bool_constant<
2517 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2518 > __test(int);
2519
2520 template<typename>
2521 static false_type __test(...);
2522 };
2523
2524 } // namespace __swappable_details
2525
2526 template<typename _Tp>
2527 struct __is_swappable_impl
2528 : public __swappable_details::__do_is_swappable_impl
2529 {
2530 typedef decltype(__test<_Tp>(0)) type;
2531 };
2532
2533 template<typename _Tp>
2534 struct __is_nothrow_swappable_impl
2535 : public __swappable_details::__do_is_nothrow_swappable_impl
2536 {
2537 typedef decltype(__test<_Tp>(0)) type;
2538 };
2539
2540 template<typename _Tp>
2541 struct __is_swappable
2542 : public __is_swappable_impl<_Tp>::type
2543 { };
2544
2545 template<typename _Tp>
2546 struct __is_nothrow_swappable
2547 : public __is_nothrow_swappable_impl<_Tp>::type
2548 { };
2549
2550#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2551#define __cpp_lib_is_swappable 201603
2552 /// Metafunctions used for detecting swappable types: p0185r1
2553
2554 /// is_swappable
2555 template<typename _Tp>
2556 struct is_swappable
2557 : public __is_swappable_impl<_Tp>::type
2558 { };
2559
2560 /// is_nothrow_swappable
2561 template<typename _Tp>
2562 struct is_nothrow_swappable
2563 : public __is_nothrow_swappable_impl<_Tp>::type
2564 { };
2565
2566#if __cplusplus >= 201402L
2567 /// is_swappable_v
2568 template<typename _Tp>
2569 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2570 is_swappable<_Tp>::value;
2571
2572 /// is_nothrow_swappable_v
2573 template<typename _Tp>
2574 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2575 is_nothrow_swappable<_Tp>::value;
2576#endif // __cplusplus >= 201402L
2577
2578 namespace __swappable_with_details {
2579 using std::swap;
2580
2581 struct __do_is_swappable_with_impl
2582 {
2583 template<typename _Tp, typename _Up, typename
2584 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2585 typename
2586 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2587 static true_type __test(int);
2588
2589 template<typename, typename>
2590 static false_type __test(...);
2591 };
2592
2593 struct __do_is_nothrow_swappable_with_impl
2594 {
2595 template<typename _Tp, typename _Up>
2596 static __bool_constant<
2597 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2598 &&
2599 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2600 > __test(int);
2601
2602 template<typename, typename>
2603 static false_type __test(...);
2604 };
2605
2606 } // namespace __swappable_with_details
2607
2608 template<typename _Tp, typename _Up>
2609 struct __is_swappable_with_impl
2610 : public __swappable_with_details::__do_is_swappable_with_impl
2611 {
2612 typedef decltype(__test<_Tp, _Up>(0)) type;
2613 };
2614
2615 // Optimization for the homogenous lvalue case, not required:
2616 template<typename _Tp>
2617 struct __is_swappable_with_impl<_Tp&, _Tp&>
2618 : public __swappable_details::__do_is_swappable_impl
2619 {
2620 typedef decltype(__test<_Tp&>(0)) type;
2621 };
2622
2623 template<typename _Tp, typename _Up>
2624 struct __is_nothrow_swappable_with_impl
2625 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2626 {
2627 typedef decltype(__test<_Tp, _Up>(0)) type;
2628 };
2629
2630 // Optimization for the homogenous lvalue case, not required:
2631 template<typename _Tp>
2632 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2633 : public __swappable_details::__do_is_nothrow_swappable_impl
2634 {
2635 typedef decltype(__test<_Tp&>(0)) type;
2636 };
2637
2638 /// is_swappable_with
2639 template<typename _Tp, typename _Up>
2640 struct is_swappable_with
2641 : public __is_swappable_with_impl<_Tp, _Up>::type
2642 { };
2643
2644 /// is_nothrow_swappable_with
2645 template<typename _Tp, typename _Up>
2646 struct is_nothrow_swappable_with
2647 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2648 { };
2649
2650#if __cplusplus >= 201402L
2651 /// is_swappable_with_v
2652 template<typename _Tp, typename _Up>
2653 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2654 is_swappable_with<_Tp, _Up>::value;
2655
2656 /// is_nothrow_swappable_with_v
2657 template<typename _Tp, typename _Up>
2658 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2659 is_nothrow_swappable_with<_Tp, _Up>::value;
2660#endif // __cplusplus >= 201402L
2661
2662#endif// c++1z or gnu++11
2663
2664 // __is_invocable (std::is_invocable for C++11)
2665
2666 // The primary template is used for invalid INVOKE expressions.
2667 template<typename _Result, typename _Ret,
2668 bool = is_void<_Ret>::value, typename = void>
2669 struct __is_invocable_impl : false_type { };
2670
2671 // Used for valid INVOKE and INVOKE<void> expressions.
2672 template<typename _Result, typename _Ret>
2673 struct __is_invocable_impl<_Result, _Ret,
2674 /* is_void<_Ret> = */ true,
2675 __void_t<typename _Result::type>>
2676 : true_type
2677 { };
2678
2679#pragma GCC diagnostic push
2680#pragma GCC diagnostic ignored "-Wctor-dtor-privacy"
2681 // Used for INVOKE<R> expressions to check the implicit conversion to R.
2682 template<typename _Result, typename _Ret>
2683 struct __is_invocable_impl<_Result, _Ret,
2684 /* is_void<_Ret> = */ false,
2685 __void_t<typename _Result::type>>
2686 {
2687 private:
2688 // The type of the INVOKE expression.
2689 // Unlike declval, this doesn't add_rvalue_reference.
2690 static typename _Result::type _S_get();
2691
2692 template<typename _Tp>
2693 static void _S_conv(_Tp);
2694
2695 // This overload is viable if INVOKE(f, args...) can convert to _Tp.
2696 template<typename _Tp, typename = decltype(_S_conv<_Tp>(_S_get()))>
2697 static true_type
2698 _S_test(int);
2699
2700 template<typename _Tp>
2701 static false_type
2702 _S_test(...);
2703
2704 public:
2705 using type = decltype(_S_test<_Ret>(1));
2706 };
2707#pragma GCC diagnostic pop
2708
2709 template<typename _Fn, typename... _ArgTypes>
2710 struct __is_invocable
2711 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2712 { };
2713
2714 template<typename _Fn, typename _Tp, typename... _Args>
2715 constexpr bool __call_is_nt(__invoke_memfun_ref)
2716 {
2717 using _Up = typename __inv_unwrap<_Tp>::type;
2718 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2719 std::declval<_Args>()...));
2720 }
2721
2722 template<typename _Fn, typename _Tp, typename... _Args>
2723 constexpr bool __call_is_nt(__invoke_memfun_deref)
2724 {
2725 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2726 std::declval<_Args>()...));
2727 }
2728
2729 template<typename _Fn, typename _Tp>
2730 constexpr bool __call_is_nt(__invoke_memobj_ref)
2731 {
2732 using _Up = typename __inv_unwrap<_Tp>::type;
2733 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2734 }
2735
2736 template<typename _Fn, typename _Tp>
2737 constexpr bool __call_is_nt(__invoke_memobj_deref)
2738 {
2739 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2740 }
2741
2742 template<typename _Fn, typename... _Args>
2743 constexpr bool __call_is_nt(__invoke_other)
2744 {
2745 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2746 }
2747
2748 template<typename _Result, typename _Fn, typename... _Args>
2749 struct __call_is_nothrow
2750 : __bool_constant<
2751 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2752 >
2753 { };
2754
2755 template<typename _Fn, typename... _Args>
2756 using __call_is_nothrow_
2757 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2758
2759 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2760 template<typename _Fn, typename... _Args>
2761 struct __is_nothrow_invocable
2762 : __and_<__is_invocable<_Fn, _Args...>,
2763 __call_is_nothrow_<_Fn, _Args...>>::type
2764 { };
2765
2766 struct __nonesuch {
2767 __nonesuch() = delete;
2768 ~__nonesuch() = delete;
2769 __nonesuch(__nonesuch const&) = delete;
2770 void operator=(__nonesuch const&) = delete;
2771 };
2772
2773#if __cplusplus >= 201703L
2774# define __cpp_lib_is_invocable 201703
2775
2776 /// std::invoke_result
2777 template<typename _Functor, typename... _ArgTypes>
2778 struct invoke_result
2779 : public __invoke_result<_Functor, _ArgTypes...>
2780 { };
2781
2782 /// std::invoke_result_t
2783 template<typename _Fn, typename... _Args>
2784 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2785
2786 /// std::is_invocable
2787 template<typename _Fn, typename... _ArgTypes>
2788 struct is_invocable
2789 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2790 { };
2791
2792 /// std::is_invocable_r
2793 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2794 struct is_invocable_r
2795 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2796 { };
2797
2798 /// std::is_nothrow_invocable
2799 template<typename _Fn, typename... _ArgTypes>
2800 struct is_nothrow_invocable
2801 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2802 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2803 { };
2804
2805 template<typename _Result, typename _Ret, typename = void>
2806 struct __is_nt_invocable_impl : false_type { };
2807
2808 template<typename _Result, typename _Ret>
2809 struct __is_nt_invocable_impl<_Result, _Ret,
2810 __void_t<typename _Result::type>>
2811 : __or_<is_void<_Ret>,
2812 __and_<is_convertible<typename _Result::type, _Ret>,
2813 is_nothrow_constructible<_Ret, typename _Result::type>>>
2814 { };
2815
2816 /// std::is_nothrow_invocable_r
2817 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2818 struct is_nothrow_invocable_r
2819 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2820 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2821 { };
2822
2823 /// std::is_invocable_v
2824 template<typename _Fn, typename... _Args>
2825 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2826
2827 /// std::is_nothrow_invocable_v
2828 template<typename _Fn, typename... _Args>
2829 inline constexpr bool is_nothrow_invocable_v
2830 = is_nothrow_invocable<_Fn, _Args...>::value;
2831
2832 /// std::is_invocable_r_v
2833 template<typename _Fn, typename... _Args>
2834 inline constexpr bool is_invocable_r_v
2835 = is_invocable_r<_Fn, _Args...>::value;
2836
2837 /// std::is_nothrow_invocable_r_v
2838 template<typename _Fn, typename... _Args>
2839 inline constexpr bool is_nothrow_invocable_r_v
2840 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2841#endif // C++17
2842
2843#if __cplusplus >= 201703L
2844# define __cpp_lib_type_trait_variable_templates 201510L
2845template <typename _Tp>
2846 inline constexpr bool is_void_v = is_void<_Tp>::value;
2847template <typename _Tp>
2848 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2849template <typename _Tp>
2850 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2851template <typename _Tp>
2852 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2853template <typename _Tp>
2854 inline constexpr bool is_array_v = is_array<_Tp>::value;
2855template <typename _Tp>
2856 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2857template <typename _Tp>
2858 inline constexpr bool is_lvalue_reference_v =
2859 is_lvalue_reference<_Tp>::value;
2860template <typename _Tp>
2861 inline constexpr bool is_rvalue_reference_v =
2862 is_rvalue_reference<_Tp>::value;
2863template <typename _Tp>
2864 inline constexpr bool is_member_object_pointer_v =
2865 is_member_object_pointer<_Tp>::value;
2866template <typename _Tp>
2867 inline constexpr bool is_member_function_pointer_v =
2868 is_member_function_pointer<_Tp>::value;
2869template <typename _Tp>
2870 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2871template <typename _Tp>
2872 inline constexpr bool is_union_v = is_union<_Tp>::value;
2873template <typename _Tp>
2874 inline constexpr bool is_class_v = is_class<_Tp>::value;
2875template <typename _Tp>
2876 inline constexpr bool is_function_v = is_function<_Tp>::value;
2877template <typename _Tp>
2878 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2879template <typename _Tp>
2880 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2881template <typename _Tp>
2882 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2883template <typename _Tp>
2884 inline constexpr bool is_object_v = is_object<_Tp>::value;
2885template <typename _Tp>
2886 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2887template <typename _Tp>
2888 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2889template <typename _Tp>
2890 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2891template <typename _Tp>
2892 inline constexpr bool is_const_v = is_const<_Tp>::value;
2893template <typename _Tp>
2894 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2895template <typename _Tp>
2896 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2897template <typename _Tp>
2898 inline constexpr bool is_trivially_copyable_v =
2899 is_trivially_copyable<_Tp>::value;
2900template <typename _Tp>
2901 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2902template <typename _Tp>
2903 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2904template <typename _Tp>
2905 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2906template <typename _Tp>
2907 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2908template <typename _Tp>
2909 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2910template <typename _Tp>
2911 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2912template <typename _Tp>
2913 inline constexpr bool is_final_v = is_final<_Tp>::value;
2914template <typename _Tp>
2915 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2916template <typename _Tp>
2917 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2918template <typename _Tp, typename... _Args>
2919 inline constexpr bool is_constructible_v =
2920 is_constructible<_Tp, _Args...>::value;
2921template <typename _Tp>
2922 inline constexpr bool is_default_constructible_v =
2923 is_default_constructible<_Tp>::value;
2924template <typename _Tp>
2925 inline constexpr bool is_copy_constructible_v =
2926 is_copy_constructible<_Tp>::value;
2927template <typename _Tp>
2928 inline constexpr bool is_move_constructible_v =
2929 is_move_constructible<_Tp>::value;
2930template <typename _Tp, typename _Up>
2931 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2932template <typename _Tp>
2933 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2934template <typename _Tp>
2935 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2936template <typename _Tp>
2937 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2938template <typename _Tp, typename... _Args>
2939 inline constexpr bool is_trivially_constructible_v =
2940 is_trivially_constructible<_Tp, _Args...>::value;
2941template <typename _Tp>
2942 inline constexpr bool is_trivially_default_constructible_v =
2943 is_trivially_default_constructible<_Tp>::value;
2944template <typename _Tp>
2945 inline constexpr bool is_trivially_copy_constructible_v =
2946 is_trivially_copy_constructible<_Tp>::value;
2947template <typename _Tp>
2948 inline constexpr bool is_trivially_move_constructible_v =
2949 is_trivially_move_constructible<_Tp>::value;
2950template <typename _Tp, typename _Up>
2951 inline constexpr bool is_trivially_assignable_v =
2952 is_trivially_assignable<_Tp, _Up>::value;
2953template <typename _Tp>
2954 inline constexpr bool is_trivially_copy_assignable_v =
2955 is_trivially_copy_assignable<_Tp>::value;
2956template <typename _Tp>
2957 inline constexpr bool is_trivially_move_assignable_v =
2958 is_trivially_move_assignable<_Tp>::value;
2959template <typename _Tp>
2960 inline constexpr bool is_trivially_destructible_v =
2961 is_trivially_destructible<_Tp>::value;
2962template <typename _Tp, typename... _Args>
2963 inline constexpr bool is_nothrow_constructible_v =
2964 is_nothrow_constructible<_Tp, _Args...>::value;
2965template <typename _Tp>
2966 inline constexpr bool is_nothrow_default_constructible_v =
2967 is_nothrow_default_constructible<_Tp>::value;
2968template <typename _Tp>
2969 inline constexpr bool is_nothrow_copy_constructible_v =
2970 is_nothrow_copy_constructible<_Tp>::value;
2971template <typename _Tp>
2972 inline constexpr bool is_nothrow_move_constructible_v =
2973 is_nothrow_move_constructible<_Tp>::value;
2974template <typename _Tp, typename _Up>
2975 inline constexpr bool is_nothrow_assignable_v =
2976 is_nothrow_assignable<_Tp, _Up>::value;
2977template <typename _Tp>
2978 inline constexpr bool is_nothrow_copy_assignable_v =
2979 is_nothrow_copy_assignable<_Tp>::value;
2980template <typename _Tp>
2981 inline constexpr bool is_nothrow_move_assignable_v =
2982 is_nothrow_move_assignable<_Tp>::value;
2983template <typename _Tp>
2984 inline constexpr bool is_nothrow_destructible_v =
2985 is_nothrow_destructible<_Tp>::value;
2986template <typename _Tp>
2987 inline constexpr bool has_virtual_destructor_v =
2988 has_virtual_destructor<_Tp>::value;
2989template <typename _Tp>
2990 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2991template <typename _Tp>
2992 inline constexpr size_t rank_v = rank<_Tp>::value;
2993template <typename _Tp, unsigned _Idx = 0>
2994 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2995template <typename _Tp, typename _Up>
2996 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2997template <typename _Base, typename _Derived>
2998 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2999template <typename _From, typename _To>
3000 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
3001
3002#ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
3003# define __cpp_lib_has_unique_object_representations 201606
3004 /// has_unique_object_representations
3005 template<typename _Tp>
3006 struct has_unique_object_representations
3007 : bool_constant<__has_unique_object_representations(
3008 remove_cv_t<remove_all_extents_t<_Tp>>
3009 )>
3010 { };
3011
3012 template<typename _Tp>
3013 inline constexpr bool has_unique_object_representations_v
3014 = has_unique_object_representations<_Tp>::value;
3015#endif
3016
3017#ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
3018# define __cpp_lib_is_aggregate 201703
3019 /// is_aggregate
3020 template<typename _Tp>
3021 struct is_aggregate
3022 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
3023
3024 /// is_aggregate_v
3025 template<typename _Tp>
3026 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
3027#endif
3028#endif // C++17
3029
3030#if __cplusplus > 201703L
3031#define __cpp_lib_remove_cvref 201711L
3032
3033 /// Remove references and cv-qualifiers.
3034 template<typename _Tp>
3035 struct remove_cvref
3036 {
3037 using type = __remove_cvref_t<_Tp>;
3038 };
3039
3040 template<typename _Tp>
3041 using remove_cvref_t = __remove_cvref_t<_Tp>;
3042
3043#define __cpp_lib_type_identity 201806L
3044 /// Identity metafunction.
3045 template<typename _Tp>
3046 struct type_identity { using type = _Tp; };
3047
3048 template<typename _Tp>
3049 using type_identity_t = typename type_identity<_Tp>::type;
3050
3051#define __cpp_lib_unwrap_ref 201811L
3052
3053 /// Unwrap a reference_wrapper
3054 template<typename _Tp>
3055 struct unwrap_reference { using type = _Tp; };
3056
3057 template<typename _Tp>
3058 struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; };
3059
3060 template<typename _Tp>
3061 using unwrap_reference_t = typename unwrap_reference<_Tp>::type;
3062
3063 /// Decay type and if it's a reference_wrapper, unwrap it
3064 template<typename _Tp>
3065 struct unwrap_ref_decay { using type = unwrap_reference_t<decay_t<_Tp>>; };
3066
3067 template<typename _Tp>
3068 using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
3069
3070#define __cpp_lib_bounded_array_traits 201902L
3071
3072 /// True for a type that is an array of known bound.
3073 template<typename _Tp>
3074 struct is_bounded_array
3075 : public __is_array_known_bounds<_Tp>
3076 { };
3077
3078 /// True for a type that is an array of unknown bound.
3079 template<typename _Tp>
3080 struct is_unbounded_array
3081 : public __is_array_unknown_bounds<_Tp>
3082 { };
3083
3084 template<typename _Tp>
3085 inline constexpr bool is_bounded_array_v
3086 = is_bounded_array<_Tp>::value;
3087
3088 template<typename _Tp>
3089 inline constexpr bool is_unbounded_array_v
3090 = is_unbounded_array<_Tp>::value;
3091
3092#ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
3093
3094#define __cpp_lib_is_constant_evaluated 201811L
3095
3096 constexpr inline bool
3097 is_constant_evaluated() noexcept
3098 { return __builtin_is_constant_evaluated(); }
3099#endif
3100
3101#endif // C++2a
3102
3103_GLIBCXX_END_NAMESPACE_VERSION
3104} // namespace std
3105
3106#endif // C++11
3107
3108#endif // _GLIBCXX_TYPE_TRAITS
3109