1 // C++11 <type_traits> -*- C++ -*-
3 // Copyright (C) 2007-2019 Free Software Foundation, Inc.
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)
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.
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.
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/>.
25 /** @file include/type_traits
26 * This is a Standard C++ Library header.
29 #ifndef _GLIBCXX_TYPE_TRAITS
30 #define _GLIBCXX_TYPE_TRAITS 1
32 #pragma GCC system_header
34 #if __cplusplus < 201103L
35 # include <bits/c++0x_warning.h>
38 #include <bits/c++config.h>
40 namespace std _GLIBCXX_VISIBILITY(default)
42 _GLIBCXX_BEGIN_NAMESPACE_VERSION
45 * @defgroup metaprogramming Metaprogramming
48 * Template utilities for compile-time introspection and modification,
49 * including type classification traits, type property inspection traits
50 * and type transformation traits.
56 template<typename _Tp, _Tp __v>
57 struct integral_constant
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
65 #define __cpp_lib_integral_constant_callable 201304
67 constexpr value_type operator()() const noexcept { return value; }
71 template<typename _Tp, _Tp __v>
72 constexpr _Tp integral_constant<_Tp, __v>::value;
74 /// The type used as a compile-time boolean with true value.
75 typedef integral_constant<bool, true> true_type;
77 /// The type used as a compile-time boolean with false value.
78 typedef integral_constant<bool, false> false_type;
81 using __bool_constant = integral_constant<bool, __v>;
83 #if __cplusplus > 201402L
84 # define __cpp_lib_bool_constant 201505
86 using bool_constant = integral_constant<bool, __v>;
89 // Meta programming helper types.
91 template<bool, typename, typename>
102 template<typename _B1>
107 template<typename _B1, typename _B2>
108 struct __or_<_B1, _B2>
109 : public conditional<_B1::value, _B1, _B2>::type
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
117 template<typename...>
125 template<typename _B1>
130 template<typename _B1, typename _B2>
131 struct __and_<_B1, _B2>
132 : public conditional<_B1::value, _B2, _B1>::type
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
140 template<typename _Pp>
142 : public __bool_constant<!bool(_Pp::value)>
145 #if __cplusplus >= 201703L
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;
152 #define __cpp_lib_logical_traits 201510
154 template<typename... _Bn>
159 template<typename... _Bn>
164 template<typename _Pp>
169 template<typename... _Bn>
170 inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
172 template<typename... _Bn>
173 inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
175 template<typename _Pp>
176 inline constexpr bool negation_v = negation<_Pp>::value;
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.
185 template<typename _Tp>
186 struct __success_type
187 { typedef _Tp type; };
189 struct __failure_type
192 // Primary type categories.
198 struct __is_void_helper
199 : public false_type { };
202 struct __is_void_helper<void>
203 : public true_type { };
206 template<typename _Tp>
208 : public __is_void_helper<typename remove_cv<_Tp>::type>::type
212 struct __is_integral_helper
213 : public false_type { };
216 struct __is_integral_helper<bool>
217 : public true_type { };
220 struct __is_integral_helper<char>
221 : public true_type { };
224 struct __is_integral_helper<signed char>
225 : public true_type { };
228 struct __is_integral_helper<unsigned char>
229 : public true_type { };
231 #ifdef _GLIBCXX_USE_WCHAR_T
233 struct __is_integral_helper<wchar_t>
234 : public true_type { };
237 #ifdef _GLIBCXX_USE_CHAR8_T
239 struct __is_integral_helper<char8_t>
240 : public true_type { };
244 struct __is_integral_helper<char16_t>
245 : public true_type { };
248 struct __is_integral_helper<char32_t>
249 : public true_type { };
252 struct __is_integral_helper<short>
253 : public true_type { };
256 struct __is_integral_helper<unsigned short>
257 : public true_type { };
260 struct __is_integral_helper<int>
261 : public true_type { };
264 struct __is_integral_helper<unsigned int>
265 : public true_type { };
268 struct __is_integral_helper<long>
269 : public true_type { };
272 struct __is_integral_helper<unsigned long>
273 : public true_type { };
276 struct __is_integral_helper<long long>
277 : public true_type { };
280 struct __is_integral_helper<unsigned long long>
281 : public true_type { };
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)
287 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
288 : public true_type { };
291 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
292 : public true_type { };
294 #if defined(__GLIBCXX_TYPE_INT_N_1)
296 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
297 : public true_type { };
300 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
301 : public true_type { };
303 #if defined(__GLIBCXX_TYPE_INT_N_2)
305 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
306 : public true_type { };
309 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
310 : public true_type { };
312 #if defined(__GLIBCXX_TYPE_INT_N_3)
314 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
315 : public true_type { };
318 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
319 : public true_type { };
323 template<typename _Tp>
325 : public __is_integral_helper<typename remove_cv<_Tp>::type>::type
329 struct __is_floating_point_helper
330 : public false_type { };
333 struct __is_floating_point_helper<float>
334 : public true_type { };
337 struct __is_floating_point_helper<double>
338 : public true_type { };
341 struct __is_floating_point_helper<long double>
342 : public true_type { };
344 #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
346 struct __is_floating_point_helper<__float128>
347 : public true_type { };
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
359 : public false_type { };
361 template<typename _Tp, std::size_t _Size>
362 struct is_array<_Tp[_Size]>
363 : public true_type { };
365 template<typename _Tp>
366 struct is_array<_Tp[]>
367 : public true_type { };
370 struct __is_pointer_helper
371 : public false_type { };
373 template<typename _Tp>
374 struct __is_pointer_helper<_Tp*>
375 : public true_type { };
378 template<typename _Tp>
380 : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type
383 /// is_lvalue_reference
385 struct is_lvalue_reference
386 : public false_type { };
388 template<typename _Tp>
389 struct is_lvalue_reference<_Tp&>
390 : public true_type { };
392 /// is_rvalue_reference
394 struct is_rvalue_reference
395 : public false_type { };
397 template<typename _Tp>
398 struct is_rvalue_reference<_Tp&&>
399 : public true_type { };
405 struct __is_member_object_pointer_helper
406 : public false_type { };
408 template<typename _Tp, typename _Cp>
409 struct __is_member_object_pointer_helper<_Tp _Cp::*>
410 : public __not_<is_function<_Tp>>::type { };
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
420 struct __is_member_function_pointer_helper
421 : public false_type { };
423 template<typename _Tp, typename _Cp>
424 struct __is_member_function_pointer_helper<_Tp _Cp::*>
425 : public is_function<_Tp>::type { };
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
435 template<typename _Tp>
437 : public integral_constant<bool, __is_enum(_Tp)>
441 template<typename _Tp>
443 : public integral_constant<bool, __is_union(_Tp)>
447 template<typename _Tp>
449 : public integral_constant<bool, __is_class(_Tp)>
455 : public false_type { };
457 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
458 struct is_function<_Res(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL>
459 : public true_type { };
461 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
462 struct is_function<_Res(_ArgTypes...) & _GLIBCXX_NOEXCEPT_QUAL>
463 : public true_type { };
465 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
466 struct is_function<_Res(_ArgTypes...) && _GLIBCXX_NOEXCEPT_QUAL>
467 : public true_type { };
469 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
470 struct is_function<_Res(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL>
471 : public true_type { };
473 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
474 struct is_function<_Res(_ArgTypes......) & _GLIBCXX_NOEXCEPT_QUAL>
475 : public true_type { };
477 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
478 struct is_function<_Res(_ArgTypes......) && _GLIBCXX_NOEXCEPT_QUAL>
479 : public true_type { };
481 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
482 struct is_function<_Res(_ArgTypes...) const _GLIBCXX_NOEXCEPT_QUAL>
483 : public true_type { };
485 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
486 struct is_function<_Res(_ArgTypes...) const & _GLIBCXX_NOEXCEPT_QUAL>
487 : public true_type { };
489 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
490 struct is_function<_Res(_ArgTypes...) const && _GLIBCXX_NOEXCEPT_QUAL>
491 : public true_type { };
493 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
494 struct is_function<_Res(_ArgTypes......) const _GLIBCXX_NOEXCEPT_QUAL>
495 : public true_type { };
497 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
498 struct is_function<_Res(_ArgTypes......) const & _GLIBCXX_NOEXCEPT_QUAL>
499 : public true_type { };
501 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
502 struct is_function<_Res(_ArgTypes......) const && _GLIBCXX_NOEXCEPT_QUAL>
503 : public true_type { };
505 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
506 struct is_function<_Res(_ArgTypes...) volatile _GLIBCXX_NOEXCEPT_QUAL>
507 : public true_type { };
509 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
510 struct is_function<_Res(_ArgTypes...) volatile & _GLIBCXX_NOEXCEPT_QUAL>
511 : public true_type { };
513 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
514 struct is_function<_Res(_ArgTypes...) volatile && _GLIBCXX_NOEXCEPT_QUAL>
515 : public true_type { };
517 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
518 struct is_function<_Res(_ArgTypes......) volatile _GLIBCXX_NOEXCEPT_QUAL>
519 : public true_type { };
521 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
522 struct is_function<_Res(_ArgTypes......) volatile & _GLIBCXX_NOEXCEPT_QUAL>
523 : public true_type { };
525 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
526 struct is_function<_Res(_ArgTypes......) volatile && _GLIBCXX_NOEXCEPT_QUAL>
527 : public true_type { };
529 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
530 struct is_function<_Res(_ArgTypes...) const volatile _GLIBCXX_NOEXCEPT_QUAL>
531 : public true_type { };
533 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
534 struct is_function<_Res(_ArgTypes...) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
535 : public true_type { };
537 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
538 struct is_function<_Res(_ArgTypes...) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
539 : public true_type { };
541 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
542 struct is_function<_Res(_ArgTypes......) const volatile _GLIBCXX_NOEXCEPT_QUAL>
543 : public true_type { };
545 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
546 struct is_function<_Res(_ArgTypes......) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
547 : public true_type { };
549 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
550 struct is_function<_Res(_ArgTypes......) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
551 : public true_type { };
553 #define __cpp_lib_is_null_pointer 201309
556 struct __is_null_pointer_helper
557 : public false_type { };
560 struct __is_null_pointer_helper<std::nullptr_t>
561 : public true_type { };
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
569 /// __is_nullptr_t (extension).
570 template<typename _Tp>
571 struct __is_nullptr_t
572 : public is_null_pointer<_Tp>
575 // Composite type categories.
578 template<typename _Tp>
580 : public __or_<is_lvalue_reference<_Tp>,
581 is_rvalue_reference<_Tp>>::type
585 template<typename _Tp>
587 : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
591 template<typename _Tp>
592 struct is_fundamental
593 : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
594 is_null_pointer<_Tp>>::type
598 template<typename _Tp>
600 : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
605 struct is_member_pointer;
608 template<typename _Tp>
610 : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
611 is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
615 template<typename _Tp>
617 : public __not_<is_fundamental<_Tp>>::type { };
619 template<typename _Tp>
620 struct __is_member_pointer_helper
621 : public false_type { };
623 template<typename _Tp, typename _Cp>
624 struct __is_member_pointer_helper<_Tp _Cp::*>
625 : public true_type { };
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
633 // Utility to detect referenceable types ([defns.referenceable]).
635 template<typename _Tp>
636 struct __is_referenceable
637 : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
640 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
641 struct __is_referenceable<_Res(_Args...) _GLIBCXX_NOEXCEPT_QUAL>
645 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
646 struct __is_referenceable<_Res(_Args......) _GLIBCXX_NOEXCEPT_QUAL>
655 : public false_type { };
657 template<typename _Tp>
658 struct is_const<_Tp const>
659 : public true_type { };
664 : public false_type { };
666 template<typename _Tp>
667 struct is_volatile<_Tp volatile>
668 : public true_type { };
671 template<typename _Tp>
673 : public integral_constant<bool, __is_trivial(_Tp)>
676 // is_trivially_copyable
677 template<typename _Tp>
678 struct is_trivially_copyable
679 : public integral_constant<bool, __is_trivially_copyable(_Tp)>
682 /// is_standard_layout
683 template<typename _Tp>
684 struct is_standard_layout
685 : public integral_constant<bool, __is_standard_layout(_Tp)>
689 // Could use is_standard_layout && is_trivial instead of the builtin.
690 template<typename _Tp>
692 : public integral_constant<bool, __is_pod(_Tp)>
696 template<typename _Tp>
697 struct is_literal_type
698 : public integral_constant<bool, __is_literal_type(_Tp)>
702 template<typename _Tp>
704 : public integral_constant<bool, __is_empty(_Tp)>
708 template<typename _Tp>
709 struct is_polymorphic
710 : public integral_constant<bool, __is_polymorphic(_Tp)>
713 #if __cplusplus >= 201402L
714 #define __cpp_lib_is_final 201402L
716 template<typename _Tp>
718 : public integral_constant<bool, __is_final(_Tp)>
723 template<typename _Tp>
725 : public integral_constant<bool, __is_abstract(_Tp)>
728 template<typename _Tp,
729 bool = is_arithmetic<_Tp>::value>
730 struct __is_signed_helper
731 : public false_type { };
733 template<typename _Tp>
734 struct __is_signed_helper<_Tp, true>
735 : public integral_constant<bool, _Tp(-1) < _Tp(0)>
739 template<typename _Tp>
741 : public __is_signed_helper<_Tp>::type
745 template<typename _Tp>
747 : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
751 // Destructible and constructible type properties.
754 * @brief Utility to simplify expressions used in unevaluated operands
758 template<typename _Tp, typename _Up = _Tp&&>
762 template<typename _Tp>
766 template<typename _Tp>
767 auto declval() noexcept -> decltype(__declval<_Tp>(0));
769 template<typename, unsigned = 0>
773 struct remove_all_extents;
775 template<typename _Tp>
776 struct __is_array_known_bounds
777 : public integral_constant<bool, (extent<_Tp>::value > 0)>
780 template<typename _Tp>
781 struct __is_array_unknown_bounds
782 : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
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
792 template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
793 static true_type __test(int);
796 static false_type __test(...);
799 template<typename _Tp>
800 struct __is_destructible_impl
801 : public __do_is_destructible_impl
803 typedef decltype(__test<_Tp>(0)) type;
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;
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
819 template<typename _Tp>
820 struct __is_destructible_safe<_Tp, true, false>
821 : public false_type { };
823 template<typename _Tp>
824 struct __is_destructible_safe<_Tp, false, true>
825 : public true_type { };
828 template<typename _Tp>
829 struct is_destructible
830 : public __is_destructible_safe<_Tp>::type
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
839 template<typename _Tp>
840 static __bool_constant<noexcept(declval<_Tp&>().~_Tp())>
844 static false_type __test(...);
847 template<typename _Tp>
848 struct __is_nt_destructible_impl
849 : public __do_is_nt_destructible_impl
851 typedef decltype(__test<_Tp>(0)) type;
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;
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
867 template<typename _Tp>
868 struct __is_nt_destructible_safe<_Tp, true, false>
869 : public false_type { };
871 template<typename _Tp>
872 struct __is_nt_destructible_safe<_Tp, false, true>
873 : public true_type { };
875 /// is_nothrow_destructible
876 template<typename _Tp>
877 struct is_nothrow_destructible
878 : public __is_nt_destructible_safe<_Tp>::type
881 struct __do_is_default_constructible_impl
883 template<typename _Tp, typename = decltype(_Tp())>
884 static true_type __test(int);
887 static false_type __test(...);
890 template<typename _Tp>
891 struct __is_default_constructible_impl
892 : public __do_is_default_constructible_impl
894 typedef decltype(__test<_Tp>(0)) type;
897 template<typename _Tp>
898 struct __is_default_constructible_atom
899 : public __and_<__not_<is_void<_Tp>>,
900 __is_default_constructible_impl<_Tp>>
903 template<typename _Tp, bool = is_array<_Tp>::value>
904 struct __is_default_constructible_safe;
906 // The following technique is a workaround for a current core language
907 // restriction, which does not allow for array types to occur in
908 // functional casts of the form T(). Complete arrays can be default-
909 // constructed, if the element type is default-constructible, but
910 // arrays with unknown bounds are not.
911 template<typename _Tp>
912 struct __is_default_constructible_safe<_Tp, true>
913 : public __and_<__is_array_known_bounds<_Tp>,
914 __is_default_constructible_atom<typename
915 remove_all_extents<_Tp>::type>>
918 template<typename _Tp>
919 struct __is_default_constructible_safe<_Tp, false>
920 : public __is_default_constructible_atom<_Tp>::type
923 /// is_default_constructible
924 template<typename _Tp>
925 struct is_default_constructible
926 : public __is_default_constructible_safe<_Tp>::type
930 template<typename _Tp, typename... _Args>
931 struct is_constructible
932 : public __bool_constant<__is_constructible(_Tp, _Args...)>
935 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
936 struct __is_copy_constructible_impl;
938 template<typename _Tp>
939 struct __is_copy_constructible_impl<_Tp, false>
940 : public false_type { };
942 template<typename _Tp>
943 struct __is_copy_constructible_impl<_Tp, true>
944 : public is_constructible<_Tp, const _Tp&>
947 /// is_copy_constructible
948 template<typename _Tp>
949 struct is_copy_constructible
950 : public __is_copy_constructible_impl<_Tp>
953 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
954 struct __is_move_constructible_impl;
956 template<typename _Tp>
957 struct __is_move_constructible_impl<_Tp, false>
958 : public false_type { };
960 template<typename _Tp>
961 struct __is_move_constructible_impl<_Tp, true>
962 : public is_constructible<_Tp, _Tp&&>
965 /// is_move_constructible
966 template<typename _Tp>
967 struct is_move_constructible
968 : public __is_move_constructible_impl<_Tp>
971 template<typename _Tp>
972 struct __is_nt_default_constructible_atom
973 : public integral_constant<bool, noexcept(_Tp())>
976 template<typename _Tp, bool = is_array<_Tp>::value>
977 struct __is_nt_default_constructible_impl;
979 template<typename _Tp>
980 struct __is_nt_default_constructible_impl<_Tp, true>
981 : public __and_<__is_array_known_bounds<_Tp>,
982 __is_nt_default_constructible_atom<typename
983 remove_all_extents<_Tp>::type>>
986 template<typename _Tp>
987 struct __is_nt_default_constructible_impl<_Tp, false>
988 : public __is_nt_default_constructible_atom<_Tp>
991 /// is_nothrow_default_constructible
992 template<typename _Tp>
993 struct is_nothrow_default_constructible
994 : public __and_<is_default_constructible<_Tp>,
995 __is_nt_default_constructible_impl<_Tp>>
998 template<typename _Tp, typename... _Args>
999 struct __is_nt_constructible_impl
1000 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
1003 template<typename _Tp, typename _Arg>
1004 struct __is_nt_constructible_impl<_Tp, _Arg>
1005 : public integral_constant<bool,
1006 noexcept(static_cast<_Tp>(declval<_Arg>()))>
1009 template<typename _Tp>
1010 struct __is_nt_constructible_impl<_Tp>
1011 : public is_nothrow_default_constructible<_Tp>
1014 /// is_nothrow_constructible
1015 template<typename _Tp, typename... _Args>
1016 struct is_nothrow_constructible
1017 : public __and_<is_constructible<_Tp, _Args...>,
1018 __is_nt_constructible_impl<_Tp, _Args...>>
1021 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1022 struct __is_nothrow_copy_constructible_impl;
1024 template<typename _Tp>
1025 struct __is_nothrow_copy_constructible_impl<_Tp, false>
1026 : public false_type { };
1028 template<typename _Tp>
1029 struct __is_nothrow_copy_constructible_impl<_Tp, true>
1030 : public is_nothrow_constructible<_Tp, const _Tp&>
1033 /// is_nothrow_copy_constructible
1034 template<typename _Tp>
1035 struct is_nothrow_copy_constructible
1036 : public __is_nothrow_copy_constructible_impl<_Tp>
1039 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1040 struct __is_nothrow_move_constructible_impl;
1042 template<typename _Tp>
1043 struct __is_nothrow_move_constructible_impl<_Tp, false>
1044 : public false_type { };
1046 template<typename _Tp>
1047 struct __is_nothrow_move_constructible_impl<_Tp, true>
1048 : public is_nothrow_constructible<_Tp, _Tp&&>
1051 /// is_nothrow_move_constructible
1052 template<typename _Tp>
1053 struct is_nothrow_move_constructible
1054 : public __is_nothrow_move_constructible_impl<_Tp>
1058 template<typename _Tp, typename _Up>
1059 struct is_assignable
1060 : public __bool_constant<__is_assignable(_Tp, _Up)>
1063 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1064 struct __is_copy_assignable_impl;
1066 template<typename _Tp>
1067 struct __is_copy_assignable_impl<_Tp, false>
1068 : public false_type { };
1070 template<typename _Tp>
1071 struct __is_copy_assignable_impl<_Tp, true>
1072 : public is_assignable<_Tp&, const _Tp&>
1075 /// is_copy_assignable
1076 template<typename _Tp>
1077 struct is_copy_assignable
1078 : public __is_copy_assignable_impl<_Tp>
1081 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1082 struct __is_move_assignable_impl;
1084 template<typename _Tp>
1085 struct __is_move_assignable_impl<_Tp, false>
1086 : public false_type { };
1088 template<typename _Tp>
1089 struct __is_move_assignable_impl<_Tp, true>
1090 : public is_assignable<_Tp&, _Tp&&>
1093 /// is_move_assignable
1094 template<typename _Tp>
1095 struct is_move_assignable
1096 : public __is_move_assignable_impl<_Tp>
1099 template<typename _Tp, typename _Up>
1100 struct __is_nt_assignable_impl
1101 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1104 /// is_nothrow_assignable
1105 template<typename _Tp, typename _Up>
1106 struct is_nothrow_assignable
1107 : public __and_<is_assignable<_Tp, _Up>,
1108 __is_nt_assignable_impl<_Tp, _Up>>
1111 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1112 struct __is_nt_copy_assignable_impl;
1114 template<typename _Tp>
1115 struct __is_nt_copy_assignable_impl<_Tp, false>
1116 : public false_type { };
1118 template<typename _Tp>
1119 struct __is_nt_copy_assignable_impl<_Tp, true>
1120 : public is_nothrow_assignable<_Tp&, const _Tp&>
1123 /// is_nothrow_copy_assignable
1124 template<typename _Tp>
1125 struct is_nothrow_copy_assignable
1126 : public __is_nt_copy_assignable_impl<_Tp>
1129 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1130 struct __is_nt_move_assignable_impl;
1132 template<typename _Tp>
1133 struct __is_nt_move_assignable_impl<_Tp, false>
1134 : public false_type { };
1136 template<typename _Tp>
1137 struct __is_nt_move_assignable_impl<_Tp, true>
1138 : public is_nothrow_assignable<_Tp&, _Tp&&>
1141 /// is_nothrow_move_assignable
1142 template<typename _Tp>
1143 struct is_nothrow_move_assignable
1144 : public __is_nt_move_assignable_impl<_Tp>
1147 /// is_trivially_constructible
1148 template<typename _Tp, typename... _Args>
1149 struct is_trivially_constructible
1150 : public __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
1153 /// is_trivially_default_constructible
1154 template<typename _Tp>
1155 struct is_trivially_default_constructible
1156 : public is_trivially_constructible<_Tp>::type
1159 struct __do_is_implicitly_default_constructible_impl
1161 template <typename _Tp>
1162 static void __helper(const _Tp&);
1164 template <typename _Tp>
1165 static true_type __test(const _Tp&,
1166 decltype(__helper<const _Tp&>({}))* = 0);
1168 static false_type __test(...);
1171 template<typename _Tp>
1172 struct __is_implicitly_default_constructible_impl
1173 : public __do_is_implicitly_default_constructible_impl
1175 typedef decltype(__test(declval<_Tp>())) type;
1178 template<typename _Tp>
1179 struct __is_implicitly_default_constructible_safe
1180 : public __is_implicitly_default_constructible_impl<_Tp>::type
1183 template <typename _Tp>
1184 struct __is_implicitly_default_constructible
1185 : public __and_<is_default_constructible<_Tp>,
1186 __is_implicitly_default_constructible_safe<_Tp>>
1189 /// is_trivially_copy_constructible
1191 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1192 struct __is_trivially_copy_constructible_impl;
1194 template<typename _Tp>
1195 struct __is_trivially_copy_constructible_impl<_Tp, false>
1196 : public false_type { };
1198 template<typename _Tp>
1199 struct __is_trivially_copy_constructible_impl<_Tp, true>
1200 : public __and_<is_copy_constructible<_Tp>,
1201 integral_constant<bool,
1202 __is_trivially_constructible(_Tp, const _Tp&)>>
1205 template<typename _Tp>
1206 struct is_trivially_copy_constructible
1207 : public __is_trivially_copy_constructible_impl<_Tp>
1210 /// is_trivially_move_constructible
1212 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1213 struct __is_trivially_move_constructible_impl;
1215 template<typename _Tp>
1216 struct __is_trivially_move_constructible_impl<_Tp, false>
1217 : public false_type { };
1219 template<typename _Tp>
1220 struct __is_trivially_move_constructible_impl<_Tp, true>
1221 : public __and_<is_move_constructible<_Tp>,
1222 integral_constant<bool,
1223 __is_trivially_constructible(_Tp, _Tp&&)>>
1226 template<typename _Tp>
1227 struct is_trivially_move_constructible
1228 : public __is_trivially_move_constructible_impl<_Tp>
1231 /// is_trivially_assignable
1232 template<typename _Tp, typename _Up>
1233 struct is_trivially_assignable
1234 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1237 /// is_trivially_copy_assignable
1239 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1240 struct __is_trivially_copy_assignable_impl;
1242 template<typename _Tp>
1243 struct __is_trivially_copy_assignable_impl<_Tp, false>
1244 : public false_type { };
1246 template<typename _Tp>
1247 struct __is_trivially_copy_assignable_impl<_Tp, true>
1248 : public __bool_constant<__is_trivially_assignable(_Tp&, const _Tp&)>
1251 template<typename _Tp>
1252 struct is_trivially_copy_assignable
1253 : public __is_trivially_copy_assignable_impl<_Tp>
1256 /// is_trivially_move_assignable
1258 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1259 struct __is_trivially_move_assignable_impl;
1261 template<typename _Tp>
1262 struct __is_trivially_move_assignable_impl<_Tp, false>
1263 : public false_type { };
1265 template<typename _Tp>
1266 struct __is_trivially_move_assignable_impl<_Tp, true>
1267 : public __bool_constant<__is_trivially_assignable(_Tp&, _Tp&&)>
1270 template<typename _Tp>
1271 struct is_trivially_move_assignable
1272 : public __is_trivially_move_assignable_impl<_Tp>
1275 /// is_trivially_destructible
1276 template<typename _Tp>
1277 struct is_trivially_destructible
1278 : public __and_<is_destructible<_Tp>,
1279 __bool_constant<__has_trivial_destructor(_Tp)>>
1283 /// has_virtual_destructor
1284 template<typename _Tp>
1285 struct has_virtual_destructor
1286 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1290 // type property queries.
1293 template<typename _Tp>
1295 : public integral_constant<std::size_t, alignof(_Tp)> { };
1300 : public integral_constant<std::size_t, 0> { };
1302 template<typename _Tp, std::size_t _Size>
1303 struct rank<_Tp[_Size]>
1304 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1306 template<typename _Tp>
1308 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1311 template<typename, unsigned _Uint>
1313 : public integral_constant<std::size_t, 0> { };
1315 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1316 struct extent<_Tp[_Size], _Uint>
1317 : public integral_constant<std::size_t,
1318 _Uint == 0 ? _Size : extent<_Tp,
1322 template<typename _Tp, unsigned _Uint>
1323 struct extent<_Tp[], _Uint>
1324 : public integral_constant<std::size_t,
1325 _Uint == 0 ? 0 : extent<_Tp,
1333 template<typename, typename>
1335 : public false_type { };
1337 template<typename _Tp>
1338 struct is_same<_Tp, _Tp>
1339 : public true_type { };
1342 template<typename _Base, typename _Derived>
1344 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1347 template<typename _From, typename _To,
1348 bool = __or_<is_void<_From>, is_function<_To>,
1349 is_array<_To>>::value>
1350 struct __is_convertible_helper
1352 typedef typename is_void<_To>::type type;
1355 template<typename _From, typename _To>
1356 class __is_convertible_helper<_From, _To, false>
1358 template<typename _To1>
1359 static void __test_aux(_To1) noexcept;
1361 template<typename _From1, typename _To1,
1362 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1366 template<typename, typename>
1371 typedef decltype(__test<_From, _To>(0)) type;
1376 template<typename _From, typename _To>
1377 struct is_convertible
1378 : public __is_convertible_helper<_From, _To>::type
1381 #if __cplusplus > 201703L
1382 template<typename _From, typename _To,
1383 bool = __or_<is_void<_From>, is_function<_To>,
1384 is_array<_To>>::value>
1385 struct __is_nt_convertible_helper
1389 template<typename _From, typename _To>
1390 class __is_nt_convertible_helper<_From, _To, false>
1392 template<typename _To1>
1393 static void __test_aux(_To1) noexcept;
1395 template<typename _From1, typename _To1>
1396 static bool_constant<noexcept(__test_aux<_To1>(std::declval<_From1>()))>
1399 template<typename, typename>
1404 using type = decltype(__test<_From, _To>(0));
1407 /// is_nothrow_convertible
1408 template<typename _From, typename _To>
1409 struct is_nothrow_convertible
1410 : public __is_nt_convertible_helper<_From, _To>::type
1413 /// is_nothrow_convertible_v
1414 template<typename _From, typename _To>
1415 inline constexpr bool is_nothrow_convertible_v
1416 = is_nothrow_convertible<_From, _To>::value;
1419 // Const-volatile modifications.
1422 template<typename _Tp>
1424 { typedef _Tp type; };
1426 template<typename _Tp>
1427 struct remove_const<_Tp const>
1428 { typedef _Tp type; };
1431 template<typename _Tp>
1432 struct remove_volatile
1433 { typedef _Tp type; };
1435 template<typename _Tp>
1436 struct remove_volatile<_Tp volatile>
1437 { typedef _Tp type; };
1440 template<typename _Tp>
1444 remove_const<typename remove_volatile<_Tp>::type>::type type;
1448 template<typename _Tp>
1450 { typedef _Tp const type; };
1453 template<typename _Tp>
1455 { typedef _Tp volatile type; };
1458 template<typename _Tp>
1462 add_const<typename add_volatile<_Tp>::type>::type type;
1465 #if __cplusplus > 201103L
1467 #define __cpp_lib_transformation_trait_aliases 201304
1469 /// Alias template for remove_const
1470 template<typename _Tp>
1471 using remove_const_t = typename remove_const<_Tp>::type;
1473 /// Alias template for remove_volatile
1474 template<typename _Tp>
1475 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1477 /// Alias template for remove_cv
1478 template<typename _Tp>
1479 using remove_cv_t = typename remove_cv<_Tp>::type;
1481 /// Alias template for add_const
1482 template<typename _Tp>
1483 using add_const_t = typename add_const<_Tp>::type;
1485 /// Alias template for add_volatile
1486 template<typename _Tp>
1487 using add_volatile_t = typename add_volatile<_Tp>::type;
1489 /// Alias template for add_cv
1490 template<typename _Tp>
1491 using add_cv_t = typename add_cv<_Tp>::type;
1494 // Reference transformations.
1496 /// remove_reference
1497 template<typename _Tp>
1498 struct remove_reference
1499 { typedef _Tp type; };
1501 template<typename _Tp>
1502 struct remove_reference<_Tp&>
1503 { typedef _Tp type; };
1505 template<typename _Tp>
1506 struct remove_reference<_Tp&&>
1507 { typedef _Tp type; };
1509 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1510 struct __add_lvalue_reference_helper
1511 { typedef _Tp type; };
1513 template<typename _Tp>
1514 struct __add_lvalue_reference_helper<_Tp, true>
1515 { typedef _Tp& type; };
1517 /// add_lvalue_reference
1518 template<typename _Tp>
1519 struct add_lvalue_reference
1520 : public __add_lvalue_reference_helper<_Tp>
1523 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1524 struct __add_rvalue_reference_helper
1525 { typedef _Tp type; };
1527 template<typename _Tp>
1528 struct __add_rvalue_reference_helper<_Tp, true>
1529 { typedef _Tp&& type; };
1531 /// add_rvalue_reference
1532 template<typename _Tp>
1533 struct add_rvalue_reference
1534 : public __add_rvalue_reference_helper<_Tp>
1537 #if __cplusplus > 201103L
1538 /// Alias template for remove_reference
1539 template<typename _Tp>
1540 using remove_reference_t = typename remove_reference<_Tp>::type;
1542 /// Alias template for add_lvalue_reference
1543 template<typename _Tp>
1544 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1546 /// Alias template for add_rvalue_reference
1547 template<typename _Tp>
1548 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1551 // Sign modifications.
1553 // Utility for constructing identically cv-qualified types.
1554 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1555 struct __cv_selector;
1557 template<typename _Unqualified>
1558 struct __cv_selector<_Unqualified, false, false>
1559 { typedef _Unqualified __type; };
1561 template<typename _Unqualified>
1562 struct __cv_selector<_Unqualified, false, true>
1563 { typedef volatile _Unqualified __type; };
1565 template<typename _Unqualified>
1566 struct __cv_selector<_Unqualified, true, false>
1567 { typedef const _Unqualified __type; };
1569 template<typename _Unqualified>
1570 struct __cv_selector<_Unqualified, true, true>
1571 { typedef const volatile _Unqualified __type; };
1573 template<typename _Qualified, typename _Unqualified,
1574 bool _IsConst = is_const<_Qualified>::value,
1575 bool _IsVol = is_volatile<_Qualified>::value>
1576 class __match_cv_qualifiers
1578 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1581 typedef typename __match::__type __type;
1584 // Utility for finding the unsigned versions of signed integral types.
1585 template<typename _Tp>
1586 struct __make_unsigned
1587 { typedef _Tp __type; };
1590 struct __make_unsigned<char>
1591 { typedef unsigned char __type; };
1594 struct __make_unsigned<signed char>
1595 { typedef unsigned char __type; };
1598 struct __make_unsigned<short>
1599 { typedef unsigned short __type; };
1602 struct __make_unsigned<int>
1603 { typedef unsigned int __type; };
1606 struct __make_unsigned<long>
1607 { typedef unsigned long __type; };
1610 struct __make_unsigned<long long>
1611 { typedef unsigned long long __type; };
1613 #if defined(__GLIBCXX_TYPE_INT_N_0)
1615 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1616 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1618 #if defined(__GLIBCXX_TYPE_INT_N_1)
1620 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1621 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1623 #if defined(__GLIBCXX_TYPE_INT_N_2)
1625 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1626 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1628 #if defined(__GLIBCXX_TYPE_INT_N_3)
1630 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1631 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1634 // Select between integral and enum: not possible to be both.
1635 template<typename _Tp,
1636 bool _IsInt = is_integral<_Tp>::value,
1637 bool _IsEnum = is_enum<_Tp>::value>
1638 class __make_unsigned_selector;
1640 template<typename _Tp>
1641 class __make_unsigned_selector<_Tp, true, false>
1643 using __unsigned_type
1644 = typename __make_unsigned<typename remove_cv<_Tp>::type>::__type;
1648 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1651 class __make_unsigned_selector_base
1654 template<typename...> struct _List { };
1656 template<typename _Tp, typename... _Up>
1657 struct _List<_Tp, _Up...> : _List<_Up...>
1658 { static constexpr size_t __size = sizeof(_Tp); };
1660 template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
1663 template<size_t _Sz, typename _Uint, typename... _UInts>
1664 struct __select<_Sz, _List<_Uint, _UInts...>, true>
1665 { using __type = _Uint; };
1667 template<size_t _Sz, typename _Uint, typename... _UInts>
1668 struct __select<_Sz, _List<_Uint, _UInts...>, false>
1669 : __select<_Sz, _List<_UInts...>>
1673 // Choose unsigned integer type with the smallest rank and same size as _Tp
1674 template<typename _Tp>
1675 class __make_unsigned_selector<_Tp, false, true>
1676 : __make_unsigned_selector_base
1678 // With -fshort-enums, an enum may be as small as a char.
1679 using _UInts = _List<unsigned char, unsigned short, unsigned int,
1680 unsigned long, unsigned long long>;
1682 using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
1686 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1689 // wchar_t, char8_t, char16_t and char32_t are integral types but are
1690 // neither signed integer types nor unsigned integer types, so must be
1691 // transformed to the unsigned integer type with the smallest rank.
1692 // Use the partial specialization for enumeration types to do that.
1693 #if defined(_GLIBCXX_USE_WCHAR_T)
1695 struct __make_unsigned<wchar_t>
1698 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
1702 #ifdef _GLIBCXX_USE_CHAR8_T
1704 struct __make_unsigned<char8_t>
1707 = typename __make_unsigned_selector<char8_t, false, true>::__type;
1712 struct __make_unsigned<char16_t>
1715 = typename __make_unsigned_selector<char16_t, false, true>::__type;
1719 struct __make_unsigned<char32_t>
1722 = typename __make_unsigned_selector<char32_t, false, true>::__type;
1725 // Given an integral/enum type, return the corresponding unsigned
1727 // Primary template.
1729 template<typename _Tp>
1730 struct make_unsigned
1731 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1733 // Integral, but don't define.
1735 struct make_unsigned<bool>;
1738 // Utility for finding the signed versions of unsigned integral types.
1739 template<typename _Tp>
1740 struct __make_signed
1741 { typedef _Tp __type; };
1744 struct __make_signed<char>
1745 { typedef signed char __type; };
1748 struct __make_signed<unsigned char>
1749 { typedef signed char __type; };
1752 struct __make_signed<unsigned short>
1753 { typedef signed short __type; };
1756 struct __make_signed<unsigned int>
1757 { typedef signed int __type; };
1760 struct __make_signed<unsigned long>
1761 { typedef signed long __type; };
1764 struct __make_signed<unsigned long long>
1765 { typedef signed long long __type; };
1767 #if defined(__GLIBCXX_TYPE_INT_N_0)
1769 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1770 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1772 #if defined(__GLIBCXX_TYPE_INT_N_1)
1774 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1775 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1777 #if defined(__GLIBCXX_TYPE_INT_N_2)
1779 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1780 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1782 #if defined(__GLIBCXX_TYPE_INT_N_3)
1784 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1785 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1788 // Select between integral and enum: not possible to be both.
1789 template<typename _Tp,
1790 bool _IsInt = is_integral<_Tp>::value,
1791 bool _IsEnum = is_enum<_Tp>::value>
1792 class __make_signed_selector;
1794 template<typename _Tp>
1795 class __make_signed_selector<_Tp, true, false>
1798 = typename __make_signed<typename remove_cv<_Tp>::type>::__type;
1802 = typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
1805 // Choose signed integer type with the smallest rank and same size as _Tp
1806 template<typename _Tp>
1807 class __make_signed_selector<_Tp, false, true>
1809 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1812 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1815 // wchar_t, char16_t and char32_t are integral types but are neither
1816 // signed integer types nor unsigned integer types, so must be
1817 // transformed to the signed integer type with the smallest rank.
1818 // Use the partial specialization for enumeration types to do that.
1819 #if defined(_GLIBCXX_USE_WCHAR_T)
1821 struct __make_signed<wchar_t>
1824 = typename __make_signed_selector<wchar_t, false, true>::__type;
1828 #if defined(_GLIBCXX_USE_CHAR8_T)
1830 struct __make_signed<char8_t>
1833 = typename __make_signed_selector<char8_t, false, true>::__type;
1838 struct __make_signed<char16_t>
1841 = typename __make_signed_selector<char16_t, false, true>::__type;
1845 struct __make_signed<char32_t>
1848 = typename __make_signed_selector<char32_t, false, true>::__type;
1851 // Given an integral/enum type, return the corresponding signed
1853 // Primary template.
1855 template<typename _Tp>
1857 { typedef typename __make_signed_selector<_Tp>::__type type; };
1859 // Integral, but don't define.
1861 struct make_signed<bool>;
1863 #if __cplusplus > 201103L
1864 /// Alias template for make_signed
1865 template<typename _Tp>
1866 using make_signed_t = typename make_signed<_Tp>::type;
1868 /// Alias template for make_unsigned
1869 template<typename _Tp>
1870 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1873 // Array modifications.
1876 template<typename _Tp>
1877 struct remove_extent
1878 { typedef _Tp type; };
1880 template<typename _Tp, std::size_t _Size>
1881 struct remove_extent<_Tp[_Size]>
1882 { typedef _Tp type; };
1884 template<typename _Tp>
1885 struct remove_extent<_Tp[]>
1886 { typedef _Tp type; };
1888 /// remove_all_extents
1889 template<typename _Tp>
1890 struct remove_all_extents
1891 { typedef _Tp type; };
1893 template<typename _Tp, std::size_t _Size>
1894 struct remove_all_extents<_Tp[_Size]>
1895 { typedef typename remove_all_extents<_Tp>::type type; };
1897 template<typename _Tp>
1898 struct remove_all_extents<_Tp[]>
1899 { typedef typename remove_all_extents<_Tp>::type type; };
1901 #if __cplusplus > 201103L
1902 /// Alias template for remove_extent
1903 template<typename _Tp>
1904 using remove_extent_t = typename remove_extent<_Tp>::type;
1906 /// Alias template for remove_all_extents
1907 template<typename _Tp>
1908 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1911 // Pointer modifications.
1913 template<typename _Tp, typename>
1914 struct __remove_pointer_helper
1915 { typedef _Tp type; };
1917 template<typename _Tp, typename _Up>
1918 struct __remove_pointer_helper<_Tp, _Up*>
1919 { typedef _Up type; };
1922 template<typename _Tp>
1923 struct remove_pointer
1924 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1928 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1929 is_void<_Tp>>::value>
1930 struct __add_pointer_helper
1931 { typedef _Tp type; };
1933 template<typename _Tp>
1934 struct __add_pointer_helper<_Tp, true>
1935 { typedef typename remove_reference<_Tp>::type* type; };
1937 template<typename _Tp>
1939 : public __add_pointer_helper<_Tp>
1942 #if __cplusplus > 201103L
1943 /// Alias template for remove_pointer
1944 template<typename _Tp>
1945 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1947 /// Alias template for add_pointer
1948 template<typename _Tp>
1949 using add_pointer_t = typename add_pointer<_Tp>::type;
1952 template<std::size_t _Len>
1953 struct __aligned_storage_msa
1957 unsigned char __data[_Len];
1958 struct __attribute__((__aligned__)) { } __align;
1963 * @brief Alignment type.
1965 * The value of _Align is a default-alignment which shall be the
1966 * most stringent alignment requirement for any C++ object type
1967 * whose size is no greater than _Len (3.9). The member typedef
1968 * type shall be a POD type suitable for use as uninitialized
1969 * storage for any object whose size is at most _Len and whose
1970 * alignment is a divisor of _Align.
1972 template<std::size_t _Len, std::size_t _Align =
1973 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1974 struct aligned_storage
1978 unsigned char __data[_Len];
1979 struct __attribute__((__aligned__((_Align)))) { } __align;
1983 template <typename... _Types>
1984 struct __strictest_alignment
1986 static const size_t _S_alignment = 0;
1987 static const size_t _S_size = 0;
1990 template <typename _Tp, typename... _Types>
1991 struct __strictest_alignment<_Tp, _Types...>
1993 static const size_t _S_alignment =
1994 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1995 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1996 static const size_t _S_size =
1997 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1998 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
2002 * @brief Provide aligned storage for types.
2004 * [meta.trans.other]
2006 * Provides aligned storage for any of the provided types of at
2009 * @see aligned_storage
2011 template <size_t _Len, typename... _Types>
2012 struct aligned_union
2015 static_assert(sizeof...(_Types) != 0, "At least one type is required");
2017 using __strictest = __strictest_alignment<_Types...>;
2018 static const size_t _S_len = _Len > __strictest::_S_size
2019 ? _Len : __strictest::_S_size;
2021 /// The value of the strictest alignment of _Types.
2022 static const size_t alignment_value = __strictest::_S_alignment;
2024 typedef typename aligned_storage<_S_len, alignment_value>::type type;
2027 template <size_t _Len, typename... _Types>
2028 const size_t aligned_union<_Len, _Types...>::alignment_value;
2030 // Decay trait for arrays and functions, used for perfect forwarding
2031 // in make_pair, make_tuple, etc.
2032 template<typename _Up,
2033 bool _IsArray = is_array<_Up>::value,
2034 bool _IsFunction = is_function<_Up>::value>
2035 struct __decay_selector;
2038 template<typename _Up>
2039 struct __decay_selector<_Up, false, false>
2040 { typedef typename remove_cv<_Up>::type __type; };
2042 template<typename _Up>
2043 struct __decay_selector<_Up, true, false>
2044 { typedef typename remove_extent<_Up>::type* __type; };
2046 template<typename _Up>
2047 struct __decay_selector<_Up, false, true>
2048 { typedef typename add_pointer<_Up>::type __type; };
2051 template<typename _Tp>
2054 typedef typename remove_reference<_Tp>::type __remove_type;
2057 typedef typename __decay_selector<__remove_type>::__type type;
2060 template<typename _Tp>
2061 class reference_wrapper;
2063 // Helper which adds a reference to a type when given a reference_wrapper
2064 template<typename _Tp>
2065 struct __strip_reference_wrapper
2070 template<typename _Tp>
2071 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
2073 typedef _Tp& __type;
2076 template<typename _Tp>
2077 struct __decay_and_strip
2079 typedef typename __strip_reference_wrapper<
2080 typename decay<_Tp>::type>::__type __type;
2084 // Primary template.
2085 /// Define a member typedef @c type only if a boolean constant is true.
2086 template<bool, typename _Tp = void>
2090 // Partial specialization for true.
2091 template<typename _Tp>
2092 struct enable_if<true, _Tp>
2093 { typedef _Tp type; };
2095 template<typename... _Cond>
2096 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
2098 // Primary template.
2099 /// Define a member typedef @c type to one of two argument types.
2100 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2102 { typedef _Iftrue type; };
2104 // Partial specialization for false.
2105 template<typename _Iftrue, typename _Iffalse>
2106 struct conditional<false, _Iftrue, _Iffalse>
2107 { typedef _Iffalse type; };
2110 template<typename... _Tp>
2113 // Sfinae-friendly common_type implementation:
2115 struct __do_common_type_impl
2117 template<typename _Tp, typename _Up>
2118 static __success_type<typename decay<decltype
2119 (true ? std::declval<_Tp>()
2120 : std::declval<_Up>())>::type> _S_test(int);
2122 template<typename, typename>
2123 static __failure_type _S_test(...);
2126 template<typename _Tp, typename _Up>
2127 struct __common_type_impl
2128 : private __do_common_type_impl
2130 typedef decltype(_S_test<_Tp, _Up>(0)) type;
2133 struct __do_member_type_wrapper
2135 template<typename _Tp>
2136 static __success_type<typename _Tp::type> _S_test(int);
2139 static __failure_type _S_test(...);
2142 template<typename _Tp>
2143 struct __member_type_wrapper
2144 : private __do_member_type_wrapper
2146 typedef decltype(_S_test<_Tp>(0)) type;
2149 template<typename _CTp, typename... _Args>
2150 struct __expanded_common_type_wrapper
2152 typedef common_type<typename _CTp::type, _Args...> type;
2155 template<typename... _Args>
2156 struct __expanded_common_type_wrapper<__failure_type, _Args...>
2157 { typedef __failure_type type; };
2160 struct common_type<>
2163 template<typename _Tp>
2164 struct common_type<_Tp>
2165 : common_type<_Tp, _Tp>
2168 template<typename _Tp, typename _Up>
2169 struct common_type<_Tp, _Up>
2170 : public __common_type_impl<_Tp, _Up>::type
2173 template<typename _Tp, typename _Up, typename... _Vp>
2174 struct common_type<_Tp, _Up, _Vp...>
2175 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
2176 common_type<_Tp, _Up>>::type, _Vp...>::type
2179 /// The underlying type of an enum.
2180 template<typename _Tp>
2181 struct underlying_type
2183 typedef __underlying_type(_Tp) type;
2186 template<typename _Tp>
2187 struct __declval_protector
2189 static const bool __stop = false;
2192 template<typename _Tp>
2193 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2195 static_assert(__declval_protector<_Tp>::__stop,
2196 "declval() must not be used!");
2197 return __declval<_Tp>(0);
2200 // __remove_cvref_t (std::remove_cvref_t for C++11).
2201 template<typename _Tp>
2202 using __remove_cvref_t
2203 = typename remove_cv<typename remove_reference<_Tp>::type>::type;
2206 template<typename _Signature>
2209 // Sfinae-friendly result_of implementation:
2211 #define __cpp_lib_result_of_sfinae 201210
2213 struct __invoke_memfun_ref { };
2214 struct __invoke_memfun_deref { };
2215 struct __invoke_memobj_ref { };
2216 struct __invoke_memobj_deref { };
2217 struct __invoke_other { };
2219 // Associate a tag type with a specialization of __success_type.
2220 template<typename _Tp, typename _Tag>
2221 struct __result_of_success : __success_type<_Tp>
2222 { using __invoke_type = _Tag; };
2224 // [func.require] paragraph 1 bullet 1:
2225 struct __result_of_memfun_ref_impl
2227 template<typename _Fp, typename _Tp1, typename... _Args>
2228 static __result_of_success<decltype(
2229 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2230 ), __invoke_memfun_ref> _S_test(int);
2232 template<typename...>
2233 static __failure_type _S_test(...);
2236 template<typename _MemPtr, typename _Arg, typename... _Args>
2237 struct __result_of_memfun_ref
2238 : private __result_of_memfun_ref_impl
2240 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2243 // [func.require] paragraph 1 bullet 2:
2244 struct __result_of_memfun_deref_impl
2246 template<typename _Fp, typename _Tp1, typename... _Args>
2247 static __result_of_success<decltype(
2248 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2249 ), __invoke_memfun_deref> _S_test(int);
2251 template<typename...>
2252 static __failure_type _S_test(...);
2255 template<typename _MemPtr, typename _Arg, typename... _Args>
2256 struct __result_of_memfun_deref
2257 : private __result_of_memfun_deref_impl
2259 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2262 // [func.require] paragraph 1 bullet 3:
2263 struct __result_of_memobj_ref_impl
2265 template<typename _Fp, typename _Tp1>
2266 static __result_of_success<decltype(
2267 std::declval<_Tp1>().*std::declval<_Fp>()
2268 ), __invoke_memobj_ref> _S_test(int);
2270 template<typename, typename>
2271 static __failure_type _S_test(...);
2274 template<typename _MemPtr, typename _Arg>
2275 struct __result_of_memobj_ref
2276 : private __result_of_memobj_ref_impl
2278 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2281 // [func.require] paragraph 1 bullet 4:
2282 struct __result_of_memobj_deref_impl
2284 template<typename _Fp, typename _Tp1>
2285 static __result_of_success<decltype(
2286 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2287 ), __invoke_memobj_deref> _S_test(int);
2289 template<typename, typename>
2290 static __failure_type _S_test(...);
2293 template<typename _MemPtr, typename _Arg>
2294 struct __result_of_memobj_deref
2295 : private __result_of_memobj_deref_impl
2297 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2300 template<typename _MemPtr, typename _Arg>
2301 struct __result_of_memobj;
2303 template<typename _Res, typename _Class, typename _Arg>
2304 struct __result_of_memobj<_Res _Class::*, _Arg>
2306 typedef __remove_cvref_t<_Arg> _Argval;
2307 typedef _Res _Class::* _MemPtr;
2308 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2309 is_base_of<_Class, _Argval>>::value,
2310 __result_of_memobj_ref<_MemPtr, _Arg>,
2311 __result_of_memobj_deref<_MemPtr, _Arg>
2315 template<typename _MemPtr, typename _Arg, typename... _Args>
2316 struct __result_of_memfun;
2318 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2319 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2321 typedef __remove_cvref_t<_Arg> _Argval;
2322 typedef _Res _Class::* _MemPtr;
2323 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2324 is_base_of<_Class, _Argval>>::value,
2325 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2326 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2330 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2331 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2332 // as the object expression
2334 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2335 template<typename _Tp, typename _Up = typename decay<_Tp>::type>
2341 template<typename _Tp, typename _Up>
2342 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2347 template<bool, bool, typename _Functor, typename... _ArgTypes>
2348 struct __result_of_impl
2350 typedef __failure_type type;
2353 template<typename _MemPtr, typename _Arg>
2354 struct __result_of_impl<true, false, _MemPtr, _Arg>
2355 : public __result_of_memobj<typename decay<_MemPtr>::type,
2356 typename __inv_unwrap<_Arg>::type>
2359 template<typename _MemPtr, typename _Arg, typename... _Args>
2360 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2361 : public __result_of_memfun<typename decay<_MemPtr>::type,
2362 typename __inv_unwrap<_Arg>::type, _Args...>
2365 // [func.require] paragraph 1 bullet 5:
2366 struct __result_of_other_impl
2368 template<typename _Fn, typename... _Args>
2369 static __result_of_success<decltype(
2370 std::declval<_Fn>()(std::declval<_Args>()...)
2371 ), __invoke_other> _S_test(int);
2373 template<typename...>
2374 static __failure_type _S_test(...);
2377 template<typename _Functor, typename... _ArgTypes>
2378 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2379 : private __result_of_other_impl
2381 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2384 // __invoke_result (std::invoke_result for C++11)
2385 template<typename _Functor, typename... _ArgTypes>
2386 struct __invoke_result
2387 : public __result_of_impl<
2388 is_member_object_pointer<
2389 typename remove_reference<_Functor>::type
2391 is_member_function_pointer<
2392 typename remove_reference<_Functor>::type
2394 _Functor, _ArgTypes...
2398 template<typename _Functor, typename... _ArgTypes>
2399 struct result_of<_Functor(_ArgTypes...)>
2400 : public __invoke_result<_Functor, _ArgTypes...>
2403 #if __cplusplus >= 201402L
2404 /// Alias template for aligned_storage
2405 template<size_t _Len, size_t _Align =
2406 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2407 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2409 template <size_t _Len, typename... _Types>
2410 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2412 /// Alias template for decay
2413 template<typename _Tp>
2414 using decay_t = typename decay<_Tp>::type;
2416 /// Alias template for enable_if
2417 template<bool _Cond, typename _Tp = void>
2418 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2420 /// Alias template for conditional
2421 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2422 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2424 /// Alias template for common_type
2425 template<typename... _Tp>
2426 using common_type_t = typename common_type<_Tp...>::type;
2428 /// Alias template for underlying_type
2429 template<typename _Tp>
2430 using underlying_type_t = typename underlying_type<_Tp>::type;
2432 /// Alias template for result_of
2433 template<typename _Tp>
2434 using result_of_t = typename result_of<_Tp>::type;
2437 // __enable_if_t (std::enable_if_t for C++11)
2438 template<bool _Cond, typename _Tp = void>
2439 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2441 // __void_t (std::void_t for C++11)
2442 template<typename...> using __void_t = void;
2444 #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2445 #define __cpp_lib_void_t 201411
2446 /// A metafunction that always yields void, used for detecting valid types.
2447 template<typename...> using void_t = void;
2450 /// Implementation of the detection idiom (negative case).
2451 template<typename _Default, typename _AlwaysVoid,
2452 template<typename...> class _Op, typename... _Args>
2455 using value_t = false_type;
2456 using type = _Default;
2459 /// Implementation of the detection idiom (positive case).
2460 template<typename _Default, template<typename...> class _Op,
2462 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2464 using value_t = true_type;
2465 using type = _Op<_Args...>;
2468 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2469 template<typename _Default, template<typename...> class _Op,
2471 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2473 // _Op<_Args...> if that is a valid type, otherwise _Default.
2474 template<typename _Default, template<typename...> class _Op,
2476 using __detected_or_t
2477 = typename __detected_or<_Default, _Op, _Args...>::type;
2479 /// @} group metaprogramming
2482 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2483 * member type _NTYPE.
2485 #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2486 template<typename _Tp, typename = __void_t<>> \
2487 struct __has_##_NTYPE \
2490 template<typename _Tp> \
2491 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2495 template <typename _Tp>
2496 struct __is_swappable;
2498 template <typename _Tp>
2499 struct __is_nothrow_swappable;
2501 template<typename... _Elements>
2505 struct __is_tuple_like_impl : false_type
2508 template<typename... _Tps>
2509 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2512 // Internal type trait that allows us to sfinae-protect tuple_cat.
2513 template<typename _Tp>
2514 struct __is_tuple_like
2515 : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
2518 template<typename _Tp>
2520 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2521 is_move_constructible<_Tp>,
2522 is_move_assignable<_Tp>>::value>::type
2524 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2525 is_nothrow_move_assignable<_Tp>>::value);
2527 template<typename _Tp, size_t _Nm>
2529 typename enable_if<__is_swappable<_Tp>::value>::type
2530 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2531 noexcept(__is_nothrow_swappable<_Tp>::value);
2533 namespace __swappable_details {
2536 struct __do_is_swappable_impl
2538 template<typename _Tp, typename
2539 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2540 static true_type __test(int);
2543 static false_type __test(...);
2546 struct __do_is_nothrow_swappable_impl
2548 template<typename _Tp>
2549 static __bool_constant<
2550 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2554 static false_type __test(...);
2557 } // namespace __swappable_details
2559 template<typename _Tp>
2560 struct __is_swappable_impl
2561 : public __swappable_details::__do_is_swappable_impl
2563 typedef decltype(__test<_Tp>(0)) type;
2566 template<typename _Tp>
2567 struct __is_nothrow_swappable_impl
2568 : public __swappable_details::__do_is_nothrow_swappable_impl
2570 typedef decltype(__test<_Tp>(0)) type;
2573 template<typename _Tp>
2574 struct __is_swappable
2575 : public __is_swappable_impl<_Tp>::type
2578 template<typename _Tp>
2579 struct __is_nothrow_swappable
2580 : public __is_nothrow_swappable_impl<_Tp>::type
2583 #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2584 #define __cpp_lib_is_swappable 201603
2585 /// Metafunctions used for detecting swappable types: p0185r1
2588 template<typename _Tp>
2590 : public __is_swappable_impl<_Tp>::type
2593 /// is_nothrow_swappable
2594 template<typename _Tp>
2595 struct is_nothrow_swappable
2596 : public __is_nothrow_swappable_impl<_Tp>::type
2599 #if __cplusplus >= 201402L
2601 template<typename _Tp>
2602 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2603 is_swappable<_Tp>::value;
2605 /// is_nothrow_swappable_v
2606 template<typename _Tp>
2607 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2608 is_nothrow_swappable<_Tp>::value;
2609 #endif // __cplusplus >= 201402L
2611 namespace __swappable_with_details {
2614 struct __do_is_swappable_with_impl
2616 template<typename _Tp, typename _Up, typename
2617 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2619 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2620 static true_type __test(int);
2622 template<typename, typename>
2623 static false_type __test(...);
2626 struct __do_is_nothrow_swappable_with_impl
2628 template<typename _Tp, typename _Up>
2629 static __bool_constant<
2630 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2632 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2635 template<typename, typename>
2636 static false_type __test(...);
2639 } // namespace __swappable_with_details
2641 template<typename _Tp, typename _Up>
2642 struct __is_swappable_with_impl
2643 : public __swappable_with_details::__do_is_swappable_with_impl
2645 typedef decltype(__test<_Tp, _Up>(0)) type;
2648 // Optimization for the homogenous lvalue case, not required:
2649 template<typename _Tp>
2650 struct __is_swappable_with_impl<_Tp&, _Tp&>
2651 : public __swappable_details::__do_is_swappable_impl
2653 typedef decltype(__test<_Tp&>(0)) type;
2656 template<typename _Tp, typename _Up>
2657 struct __is_nothrow_swappable_with_impl
2658 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2660 typedef decltype(__test<_Tp, _Up>(0)) type;
2663 // Optimization for the homogenous lvalue case, not required:
2664 template<typename _Tp>
2665 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2666 : public __swappable_details::__do_is_nothrow_swappable_impl
2668 typedef decltype(__test<_Tp&>(0)) type;
2671 /// is_swappable_with
2672 template<typename _Tp, typename _Up>
2673 struct is_swappable_with
2674 : public __is_swappable_with_impl<_Tp, _Up>::type
2677 /// is_nothrow_swappable_with
2678 template<typename _Tp, typename _Up>
2679 struct is_nothrow_swappable_with
2680 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2683 #if __cplusplus >= 201402L
2684 /// is_swappable_with_v
2685 template<typename _Tp, typename _Up>
2686 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2687 is_swappable_with<_Tp, _Up>::value;
2689 /// is_nothrow_swappable_with_v
2690 template<typename _Tp, typename _Up>
2691 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2692 is_nothrow_swappable_with<_Tp, _Up>::value;
2693 #endif // __cplusplus >= 201402L
2695 #endif// c++1z or gnu++11
2697 // __is_invocable (std::is_invocable for C++11)
2699 template<typename _Result, typename _Ret, typename = void>
2700 struct __is_invocable_impl : false_type { };
2702 template<typename _Result, typename _Ret>
2703 struct __is_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>>
2704 : __or_<is_void<_Ret>, is_convertible<typename _Result::type, _Ret>>::type
2707 template<typename _Fn, typename... _ArgTypes>
2708 struct __is_invocable
2709 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2712 template<typename _Fn, typename _Tp, typename... _Args>
2713 constexpr bool __call_is_nt(__invoke_memfun_ref)
2715 using _Up = typename __inv_unwrap<_Tp>::type;
2716 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2717 std::declval<_Args>()...));
2720 template<typename _Fn, typename _Tp, typename... _Args>
2721 constexpr bool __call_is_nt(__invoke_memfun_deref)
2723 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2724 std::declval<_Args>()...));
2727 template<typename _Fn, typename _Tp>
2728 constexpr bool __call_is_nt(__invoke_memobj_ref)
2730 using _Up = typename __inv_unwrap<_Tp>::type;
2731 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2734 template<typename _Fn, typename _Tp>
2735 constexpr bool __call_is_nt(__invoke_memobj_deref)
2737 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2740 template<typename _Fn, typename... _Args>
2741 constexpr bool __call_is_nt(__invoke_other)
2743 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2746 template<typename _Result, typename _Fn, typename... _Args>
2747 struct __call_is_nothrow
2749 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2753 template<typename _Fn, typename... _Args>
2754 using __call_is_nothrow_
2755 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2757 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2758 template<typename _Fn, typename... _Args>
2759 struct __is_nothrow_invocable
2760 : __and_<__is_invocable<_Fn, _Args...>,
2761 __call_is_nothrow_<_Fn, _Args...>>::type
2765 __nonesuch() = delete;
2766 ~__nonesuch() = delete;
2767 __nonesuch(__nonesuch const&) = delete;
2768 void operator=(__nonesuch const&) = delete;
2771 #if __cplusplus >= 201703L
2772 # define __cpp_lib_is_invocable 201703
2774 /// std::invoke_result
2775 template<typename _Functor, typename... _ArgTypes>
2776 struct invoke_result
2777 : public __invoke_result<_Functor, _ArgTypes...>
2780 /// std::invoke_result_t
2781 template<typename _Fn, typename... _Args>
2782 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2784 /// std::is_invocable
2785 template<typename _Fn, typename... _ArgTypes>
2787 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2790 /// std::is_invocable_r
2791 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2792 struct is_invocable_r
2793 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2796 /// std::is_nothrow_invocable
2797 template<typename _Fn, typename... _ArgTypes>
2798 struct is_nothrow_invocable
2799 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2800 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2803 template<typename _Result, typename _Ret, typename = void>
2804 struct __is_nt_invocable_impl : false_type { };
2806 template<typename _Result, typename _Ret>
2807 struct __is_nt_invocable_impl<_Result, _Ret,
2808 __void_t<typename _Result::type>>
2809 : __or_<is_void<_Ret>,
2810 __and_<is_convertible<typename _Result::type, _Ret>,
2811 is_nothrow_constructible<_Ret, typename _Result::type>>>
2814 /// std::is_nothrow_invocable_r
2815 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2816 struct is_nothrow_invocable_r
2817 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2818 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2821 /// std::is_invocable_v
2822 template<typename _Fn, typename... _Args>
2823 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2825 /// std::is_nothrow_invocable_v
2826 template<typename _Fn, typename... _Args>
2827 inline constexpr bool is_nothrow_invocable_v
2828 = is_nothrow_invocable<_Fn, _Args...>::value;
2830 /// std::is_invocable_r_v
2831 template<typename _Fn, typename... _Args>
2832 inline constexpr bool is_invocable_r_v
2833 = is_invocable_r<_Fn, _Args...>::value;
2835 /// std::is_nothrow_invocable_r_v
2836 template<typename _Fn, typename... _Args>
2837 inline constexpr bool is_nothrow_invocable_r_v
2838 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2841 #if __cplusplus >= 201703L
2842 # define __cpp_lib_type_trait_variable_templates 201510L
2843 template <typename _Tp>
2844 inline constexpr bool is_void_v = is_void<_Tp>::value;
2845 template <typename _Tp>
2846 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2847 template <typename _Tp>
2848 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2849 template <typename _Tp>
2850 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2851 template <typename _Tp>
2852 inline constexpr bool is_array_v = is_array<_Tp>::value;
2853 template <typename _Tp>
2854 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2855 template <typename _Tp>
2856 inline constexpr bool is_lvalue_reference_v =
2857 is_lvalue_reference<_Tp>::value;
2858 template <typename _Tp>
2859 inline constexpr bool is_rvalue_reference_v =
2860 is_rvalue_reference<_Tp>::value;
2861 template <typename _Tp>
2862 inline constexpr bool is_member_object_pointer_v =
2863 is_member_object_pointer<_Tp>::value;
2864 template <typename _Tp>
2865 inline constexpr bool is_member_function_pointer_v =
2866 is_member_function_pointer<_Tp>::value;
2867 template <typename _Tp>
2868 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2869 template <typename _Tp>
2870 inline constexpr bool is_union_v = is_union<_Tp>::value;
2871 template <typename _Tp>
2872 inline constexpr bool is_class_v = is_class<_Tp>::value;
2873 template <typename _Tp>
2874 inline constexpr bool is_function_v = is_function<_Tp>::value;
2875 template <typename _Tp>
2876 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2877 template <typename _Tp>
2878 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2879 template <typename _Tp>
2880 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2881 template <typename _Tp>
2882 inline constexpr bool is_object_v = is_object<_Tp>::value;
2883 template <typename _Tp>
2884 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2885 template <typename _Tp>
2886 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2887 template <typename _Tp>
2888 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2889 template <typename _Tp>
2890 inline constexpr bool is_const_v = is_const<_Tp>::value;
2891 template <typename _Tp>
2892 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2893 template <typename _Tp>
2894 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2895 template <typename _Tp>
2896 inline constexpr bool is_trivially_copyable_v =
2897 is_trivially_copyable<_Tp>::value;
2898 template <typename _Tp>
2899 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2900 template <typename _Tp>
2901 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2902 template <typename _Tp>
2903 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2904 template <typename _Tp>
2905 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2906 template <typename _Tp>
2907 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2908 template <typename _Tp>
2909 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2910 template <typename _Tp>
2911 inline constexpr bool is_final_v = is_final<_Tp>::value;
2912 template <typename _Tp>
2913 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2914 template <typename _Tp>
2915 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2916 template <typename _Tp, typename... _Args>
2917 inline constexpr bool is_constructible_v =
2918 is_constructible<_Tp, _Args...>::value;
2919 template <typename _Tp>
2920 inline constexpr bool is_default_constructible_v =
2921 is_default_constructible<_Tp>::value;
2922 template <typename _Tp>
2923 inline constexpr bool is_copy_constructible_v =
2924 is_copy_constructible<_Tp>::value;
2925 template <typename _Tp>
2926 inline constexpr bool is_move_constructible_v =
2927 is_move_constructible<_Tp>::value;
2928 template <typename _Tp, typename _Up>
2929 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2930 template <typename _Tp>
2931 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2932 template <typename _Tp>
2933 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2934 template <typename _Tp>
2935 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2936 template <typename _Tp, typename... _Args>
2937 inline constexpr bool is_trivially_constructible_v =
2938 is_trivially_constructible<_Tp, _Args...>::value;
2939 template <typename _Tp>
2940 inline constexpr bool is_trivially_default_constructible_v =
2941 is_trivially_default_constructible<_Tp>::value;
2942 template <typename _Tp>
2943 inline constexpr bool is_trivially_copy_constructible_v =
2944 is_trivially_copy_constructible<_Tp>::value;
2945 template <typename _Tp>
2946 inline constexpr bool is_trivially_move_constructible_v =
2947 is_trivially_move_constructible<_Tp>::value;
2948 template <typename _Tp, typename _Up>
2949 inline constexpr bool is_trivially_assignable_v =
2950 is_trivially_assignable<_Tp, _Up>::value;
2951 template <typename _Tp>
2952 inline constexpr bool is_trivially_copy_assignable_v =
2953 is_trivially_copy_assignable<_Tp>::value;
2954 template <typename _Tp>
2955 inline constexpr bool is_trivially_move_assignable_v =
2956 is_trivially_move_assignable<_Tp>::value;
2957 template <typename _Tp>
2958 inline constexpr bool is_trivially_destructible_v =
2959 is_trivially_destructible<_Tp>::value;
2960 template <typename _Tp, typename... _Args>
2961 inline constexpr bool is_nothrow_constructible_v =
2962 is_nothrow_constructible<_Tp, _Args...>::value;
2963 template <typename _Tp>
2964 inline constexpr bool is_nothrow_default_constructible_v =
2965 is_nothrow_default_constructible<_Tp>::value;
2966 template <typename _Tp>
2967 inline constexpr bool is_nothrow_copy_constructible_v =
2968 is_nothrow_copy_constructible<_Tp>::value;
2969 template <typename _Tp>
2970 inline constexpr bool is_nothrow_move_constructible_v =
2971 is_nothrow_move_constructible<_Tp>::value;
2972 template <typename _Tp, typename _Up>
2973 inline constexpr bool is_nothrow_assignable_v =
2974 is_nothrow_assignable<_Tp, _Up>::value;
2975 template <typename _Tp>
2976 inline constexpr bool is_nothrow_copy_assignable_v =
2977 is_nothrow_copy_assignable<_Tp>::value;
2978 template <typename _Tp>
2979 inline constexpr bool is_nothrow_move_assignable_v =
2980 is_nothrow_move_assignable<_Tp>::value;
2981 template <typename _Tp>
2982 inline constexpr bool is_nothrow_destructible_v =
2983 is_nothrow_destructible<_Tp>::value;
2984 template <typename _Tp>
2985 inline constexpr bool has_virtual_destructor_v =
2986 has_virtual_destructor<_Tp>::value;
2987 template <typename _Tp>
2988 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2989 template <typename _Tp>
2990 inline constexpr size_t rank_v = rank<_Tp>::value;
2991 template <typename _Tp, unsigned _Idx = 0>
2992 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2993 template <typename _Tp, typename _Up>
2994 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2995 template <typename _Base, typename _Derived>
2996 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2997 template <typename _From, typename _To>
2998 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
3000 #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
3001 # define __cpp_lib_has_unique_object_representations 201606
3002 /// has_unique_object_representations
3003 template<typename _Tp>
3004 struct has_unique_object_representations
3005 : bool_constant<__has_unique_object_representations(
3006 remove_cv_t<remove_all_extents_t<_Tp>>
3010 template<typename _Tp>
3011 inline constexpr bool has_unique_object_representations_v
3012 = has_unique_object_representations<_Tp>::value;
3015 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
3016 # define __cpp_lib_is_aggregate 201703
3018 template<typename _Tp>
3020 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
3023 template<typename _Tp>
3024 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
3028 #if __cplusplus > 201703L
3032 little = __ORDER_LITTLE_ENDIAN__,
3033 big = __ORDER_BIG_ENDIAN__,
3034 native = __BYTE_ORDER__
3037 /// Remove references and cv-qualifiers.
3038 template<typename _Tp>
3041 using type = __remove_cvref_t<_Tp>;
3044 template<typename _Tp>
3045 using remove_cvref_t = __remove_cvref_t<_Tp>;
3047 /// Identity metafunction.
3048 template<typename _Tp>
3049 struct type_identity { using type = _Tp; };
3051 template<typename _Tp>
3052 using type_identity_t = typename type_identity<_Tp>::type;
3054 /// Unwrap a reference_wrapper
3055 template<typename _Tp>
3056 struct unwrap_reference { using type = _Tp; };
3058 template<typename _Tp>
3059 struct unwrap_reference<reference_wrapper<_Tp>> { using type = _Tp&; };
3061 /// Decay type and if it's a reference_wrapper, unwrap it
3062 template<typename _Tp>
3063 struct unwrap_ref_decay : unwrap_reference<decay_t<_Tp>> { };
3065 template<typename _Tp>
3066 using unwrap_ref_decay_t = typename unwrap_ref_decay<_Tp>::type;
3068 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED
3070 #define __cpp_lib_is_constant_evaluated 201811L
3072 constexpr inline bool
3073 is_constant_evaluated() noexcept
3074 { return __builtin_is_constant_evaluated(); }
3079 _GLIBCXX_END_NAMESPACE_VERSION
3084 #endif // _GLIBCXX_TYPE_TRAITS