1 // C++11 <type_traits> -*- C++ -*-
3 // Copyright (C) 2007-2018 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 #define __cpp_lib_logical_traits 201510
149 template<typename... _Bn>
154 template<typename... _Bn>
159 template<typename _Pp>
164 template<typename... _Bn>
165 inline constexpr bool conjunction_v = conjunction<_Bn...>::value;
167 template<typename... _Bn>
168 inline constexpr bool disjunction_v = disjunction<_Bn...>::value;
170 template<typename _Pp>
171 inline constexpr bool negation_v = negation<_Pp>::value;
175 // For several sfinae-friendly trait implementations we transport both the
176 // result information (as the member type) and the failure information (no
177 // member type). This is very similar to std::enable_if, but we cannot use
178 // them, because we need to derive from them as an implementation detail.
180 template<typename _Tp>
181 struct __success_type
182 { typedef _Tp type; };
184 struct __failure_type
187 // Primary type categories.
193 struct __is_void_helper
194 : public false_type { };
197 struct __is_void_helper<void>
198 : public true_type { };
201 template<typename _Tp>
203 : public __is_void_helper<typename remove_cv<_Tp>::type>::type
207 struct __is_integral_helper
208 : public false_type { };
211 struct __is_integral_helper<bool>
212 : public true_type { };
215 struct __is_integral_helper<char>
216 : public true_type { };
219 struct __is_integral_helper<signed char>
220 : public true_type { };
223 struct __is_integral_helper<unsigned char>
224 : public true_type { };
226 #ifdef _GLIBCXX_USE_WCHAR_T
228 struct __is_integral_helper<wchar_t>
229 : public true_type { };
233 struct __is_integral_helper<char16_t>
234 : public true_type { };
237 struct __is_integral_helper<char32_t>
238 : public true_type { };
241 struct __is_integral_helper<short>
242 : public true_type { };
245 struct __is_integral_helper<unsigned short>
246 : public true_type { };
249 struct __is_integral_helper<int>
250 : public true_type { };
253 struct __is_integral_helper<unsigned int>
254 : public true_type { };
257 struct __is_integral_helper<long>
258 : public true_type { };
261 struct __is_integral_helper<unsigned long>
262 : public true_type { };
265 struct __is_integral_helper<long long>
266 : public true_type { };
269 struct __is_integral_helper<unsigned long long>
270 : public true_type { };
272 // Conditionalizing on __STRICT_ANSI__ here will break any port that
273 // uses one of these types for size_t.
274 #if defined(__GLIBCXX_TYPE_INT_N_0)
276 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_0>
277 : public true_type { };
280 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_0>
281 : public true_type { };
283 #if defined(__GLIBCXX_TYPE_INT_N_1)
285 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_1>
286 : public true_type { };
289 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_1>
290 : public true_type { };
292 #if defined(__GLIBCXX_TYPE_INT_N_2)
294 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_2>
295 : public true_type { };
298 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_2>
299 : public true_type { };
301 #if defined(__GLIBCXX_TYPE_INT_N_3)
303 struct __is_integral_helper<__GLIBCXX_TYPE_INT_N_3>
304 : public true_type { };
307 struct __is_integral_helper<unsigned __GLIBCXX_TYPE_INT_N_3>
308 : public true_type { };
312 template<typename _Tp>
314 : public __is_integral_helper<typename remove_cv<_Tp>::type>::type
318 struct __is_floating_point_helper
319 : public false_type { };
322 struct __is_floating_point_helper<float>
323 : public true_type { };
326 struct __is_floating_point_helper<double>
327 : public true_type { };
330 struct __is_floating_point_helper<long double>
331 : public true_type { };
333 #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
335 struct __is_floating_point_helper<__float128>
336 : public true_type { };
339 /// is_floating_point
340 template<typename _Tp>
341 struct is_floating_point
342 : public __is_floating_point_helper<typename remove_cv<_Tp>::type>::type
348 : public false_type { };
350 template<typename _Tp, std::size_t _Size>
351 struct is_array<_Tp[_Size]>
352 : public true_type { };
354 template<typename _Tp>
355 struct is_array<_Tp[]>
356 : public true_type { };
359 struct __is_pointer_helper
360 : public false_type { };
362 template<typename _Tp>
363 struct __is_pointer_helper<_Tp*>
364 : public true_type { };
367 template<typename _Tp>
369 : public __is_pointer_helper<typename remove_cv<_Tp>::type>::type
372 /// is_lvalue_reference
374 struct is_lvalue_reference
375 : public false_type { };
377 template<typename _Tp>
378 struct is_lvalue_reference<_Tp&>
379 : public true_type { };
381 /// is_rvalue_reference
383 struct is_rvalue_reference
384 : public false_type { };
386 template<typename _Tp>
387 struct is_rvalue_reference<_Tp&&>
388 : public true_type { };
394 struct __is_member_object_pointer_helper
395 : public false_type { };
397 template<typename _Tp, typename _Cp>
398 struct __is_member_object_pointer_helper<_Tp _Cp::*>
399 : public integral_constant<bool, !is_function<_Tp>::value> { };
401 /// is_member_object_pointer
402 template<typename _Tp>
403 struct is_member_object_pointer
404 : public __is_member_object_pointer_helper<
405 typename remove_cv<_Tp>::type>::type
409 struct __is_member_function_pointer_helper
410 : public false_type { };
412 template<typename _Tp, typename _Cp>
413 struct __is_member_function_pointer_helper<_Tp _Cp::*>
414 : public integral_constant<bool, is_function<_Tp>::value> { };
416 /// is_member_function_pointer
417 template<typename _Tp>
418 struct is_member_function_pointer
419 : public __is_member_function_pointer_helper<
420 typename remove_cv<_Tp>::type>::type
424 template<typename _Tp>
426 : public integral_constant<bool, __is_enum(_Tp)>
430 template<typename _Tp>
432 : public integral_constant<bool, __is_union(_Tp)>
436 template<typename _Tp>
438 : public integral_constant<bool, __is_class(_Tp)>
444 : public false_type { };
446 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
447 struct is_function<_Res(_ArgTypes...) _GLIBCXX_NOEXCEPT_QUAL>
448 : public true_type { };
450 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
451 struct is_function<_Res(_ArgTypes...) & _GLIBCXX_NOEXCEPT_QUAL>
452 : public true_type { };
454 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
455 struct is_function<_Res(_ArgTypes...) && _GLIBCXX_NOEXCEPT_QUAL>
456 : public true_type { };
458 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
459 struct is_function<_Res(_ArgTypes......) _GLIBCXX_NOEXCEPT_QUAL>
460 : public true_type { };
462 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
463 struct is_function<_Res(_ArgTypes......) & _GLIBCXX_NOEXCEPT_QUAL>
464 : public true_type { };
466 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
467 struct is_function<_Res(_ArgTypes......) && _GLIBCXX_NOEXCEPT_QUAL>
468 : public true_type { };
470 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
471 struct is_function<_Res(_ArgTypes...) const _GLIBCXX_NOEXCEPT_QUAL>
472 : public true_type { };
474 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
475 struct is_function<_Res(_ArgTypes...) const & _GLIBCXX_NOEXCEPT_QUAL>
476 : public true_type { };
478 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
479 struct is_function<_Res(_ArgTypes...) const && _GLIBCXX_NOEXCEPT_QUAL>
480 : public true_type { };
482 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
483 struct is_function<_Res(_ArgTypes......) const _GLIBCXX_NOEXCEPT_QUAL>
484 : public true_type { };
486 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
487 struct is_function<_Res(_ArgTypes......) const & _GLIBCXX_NOEXCEPT_QUAL>
488 : public true_type { };
490 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
491 struct is_function<_Res(_ArgTypes......) const && _GLIBCXX_NOEXCEPT_QUAL>
492 : public true_type { };
494 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
495 struct is_function<_Res(_ArgTypes...) volatile _GLIBCXX_NOEXCEPT_QUAL>
496 : public true_type { };
498 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
499 struct is_function<_Res(_ArgTypes...) volatile & _GLIBCXX_NOEXCEPT_QUAL>
500 : public true_type { };
502 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
503 struct is_function<_Res(_ArgTypes...) volatile && _GLIBCXX_NOEXCEPT_QUAL>
504 : public true_type { };
506 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
507 struct is_function<_Res(_ArgTypes......) volatile _GLIBCXX_NOEXCEPT_QUAL>
508 : public true_type { };
510 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
511 struct is_function<_Res(_ArgTypes......) volatile & _GLIBCXX_NOEXCEPT_QUAL>
512 : public true_type { };
514 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
515 struct is_function<_Res(_ArgTypes......) volatile && _GLIBCXX_NOEXCEPT_QUAL>
516 : public true_type { };
518 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
519 struct is_function<_Res(_ArgTypes...) const volatile _GLIBCXX_NOEXCEPT_QUAL>
520 : public true_type { };
522 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
523 struct is_function<_Res(_ArgTypes...) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
524 : public true_type { };
526 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
527 struct is_function<_Res(_ArgTypes...) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
528 : public true_type { };
530 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
531 struct is_function<_Res(_ArgTypes......) const volatile _GLIBCXX_NOEXCEPT_QUAL>
532 : public true_type { };
534 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
535 struct is_function<_Res(_ArgTypes......) const volatile & _GLIBCXX_NOEXCEPT_QUAL>
536 : public true_type { };
538 template<typename _Res, typename... _ArgTypes _GLIBCXX_NOEXCEPT_PARM>
539 struct is_function<_Res(_ArgTypes......) const volatile && _GLIBCXX_NOEXCEPT_QUAL>
540 : public true_type { };
542 #define __cpp_lib_is_null_pointer 201309
545 struct __is_null_pointer_helper
546 : public false_type { };
549 struct __is_null_pointer_helper<std::nullptr_t>
550 : public true_type { };
552 /// is_null_pointer (LWG 2247).
553 template<typename _Tp>
554 struct is_null_pointer
555 : public __is_null_pointer_helper<typename remove_cv<_Tp>::type>::type
558 /// __is_nullptr_t (extension).
559 template<typename _Tp>
560 struct __is_nullptr_t
561 : public is_null_pointer<_Tp>
564 // Composite type categories.
567 template<typename _Tp>
569 : public __or_<is_lvalue_reference<_Tp>,
570 is_rvalue_reference<_Tp>>::type
574 template<typename _Tp>
576 : public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type
580 template<typename _Tp>
581 struct is_fundamental
582 : public __or_<is_arithmetic<_Tp>, is_void<_Tp>,
583 is_null_pointer<_Tp>>::type
587 template<typename _Tp>
589 : public __not_<__or_<is_function<_Tp>, is_reference<_Tp>,
594 struct is_member_pointer;
597 template<typename _Tp>
599 : public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>,
600 is_member_pointer<_Tp>, is_null_pointer<_Tp>>::type
604 template<typename _Tp>
606 : public integral_constant<bool, !is_fundamental<_Tp>::value> { };
608 template<typename _Tp>
609 struct __is_member_pointer_helper
610 : public false_type { };
612 template<typename _Tp, typename _Cp>
613 struct __is_member_pointer_helper<_Tp _Cp::*>
614 : public true_type { };
616 /// is_member_pointer
617 template<typename _Tp>
618 struct is_member_pointer
619 : public __is_member_pointer_helper<typename remove_cv<_Tp>::type>::type
622 // Utility to detect referenceable types ([defns.referenceable]).
624 template<typename _Tp>
625 struct __is_referenceable
626 : public __or_<is_object<_Tp>, is_reference<_Tp>>::type
629 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
630 struct __is_referenceable<_Res(_Args...) _GLIBCXX_NOEXCEPT_QUAL>
634 template<typename _Res, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
635 struct __is_referenceable<_Res(_Args......) _GLIBCXX_NOEXCEPT_QUAL>
644 : public false_type { };
646 template<typename _Tp>
647 struct is_const<_Tp const>
648 : public true_type { };
653 : public false_type { };
655 template<typename _Tp>
656 struct is_volatile<_Tp volatile>
657 : public true_type { };
660 template<typename _Tp>
662 : public integral_constant<bool, __is_trivial(_Tp)>
665 // is_trivially_copyable
666 template<typename _Tp>
667 struct is_trivially_copyable
668 : public integral_constant<bool, __is_trivially_copyable(_Tp)>
671 /// is_standard_layout
672 template<typename _Tp>
673 struct is_standard_layout
674 : public integral_constant<bool, __is_standard_layout(_Tp)>
678 // Could use is_standard_layout && is_trivial instead of the builtin.
679 template<typename _Tp>
681 : public integral_constant<bool, __is_pod(_Tp)>
685 template<typename _Tp>
686 struct is_literal_type
687 : public integral_constant<bool, __is_literal_type(_Tp)>
691 template<typename _Tp>
693 : public integral_constant<bool, __is_empty(_Tp)>
697 template<typename _Tp>
698 struct is_polymorphic
699 : public integral_constant<bool, __is_polymorphic(_Tp)>
702 #if __cplusplus >= 201402L
703 #define __cpp_lib_is_final 201402L
705 template<typename _Tp>
707 : public integral_constant<bool, __is_final(_Tp)>
712 template<typename _Tp>
714 : public integral_constant<bool, __is_abstract(_Tp)>
717 template<typename _Tp,
718 bool = is_arithmetic<_Tp>::value>
719 struct __is_signed_helper
720 : public false_type { };
722 template<typename _Tp>
723 struct __is_signed_helper<_Tp, true>
724 : public integral_constant<bool, _Tp(-1) < _Tp(0)>
728 template<typename _Tp>
730 : public __is_signed_helper<_Tp>::type
734 template<typename _Tp>
736 : public __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>
740 // Destructible and constructible type properties.
743 * @brief Utility to simplify expressions used in unevaluated operands
747 template<typename _Tp, typename _Up = _Tp&&>
751 template<typename _Tp>
755 template<typename _Tp>
756 auto declval() noexcept -> decltype(__declval<_Tp>(0));
758 template<typename, unsigned = 0>
762 struct remove_all_extents;
764 template<typename _Tp>
765 struct __is_array_known_bounds
766 : public integral_constant<bool, (extent<_Tp>::value > 0)>
769 template<typename _Tp>
770 struct __is_array_unknown_bounds
771 : public __and_<is_array<_Tp>, __not_<extent<_Tp>>>
774 // In N3290 is_destructible does not say anything about function
775 // types and abstract types, see LWG 2049. This implementation
776 // describes function types as non-destructible and all complete
777 // object types as destructible, iff the explicit destructor
778 // call expression is wellformed.
779 struct __do_is_destructible_impl
781 template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())>
782 static true_type __test(int);
785 static false_type __test(...);
788 template<typename _Tp>
789 struct __is_destructible_impl
790 : public __do_is_destructible_impl
792 typedef decltype(__test<_Tp>(0)) type;
795 template<typename _Tp,
796 bool = __or_<is_void<_Tp>,
797 __is_array_unknown_bounds<_Tp>,
798 is_function<_Tp>>::value,
799 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
800 struct __is_destructible_safe;
802 template<typename _Tp>
803 struct __is_destructible_safe<_Tp, false, false>
804 : public __is_destructible_impl<typename
805 remove_all_extents<_Tp>::type>::type
808 template<typename _Tp>
809 struct __is_destructible_safe<_Tp, true, false>
810 : public false_type { };
812 template<typename _Tp>
813 struct __is_destructible_safe<_Tp, false, true>
814 : public true_type { };
817 template<typename _Tp>
818 struct is_destructible
819 : public __is_destructible_safe<_Tp>::type
822 // is_nothrow_destructible requires that is_destructible is
823 // satisfied as well. We realize that by mimicing the
824 // implementation of is_destructible but refer to noexcept(expr)
825 // instead of decltype(expr).
826 struct __do_is_nt_destructible_impl
828 template<typename _Tp>
829 static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())>
833 static false_type __test(...);
836 template<typename _Tp>
837 struct __is_nt_destructible_impl
838 : public __do_is_nt_destructible_impl
840 typedef decltype(__test<_Tp>(0)) type;
843 template<typename _Tp,
844 bool = __or_<is_void<_Tp>,
845 __is_array_unknown_bounds<_Tp>,
846 is_function<_Tp>>::value,
847 bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value>
848 struct __is_nt_destructible_safe;
850 template<typename _Tp>
851 struct __is_nt_destructible_safe<_Tp, false, false>
852 : public __is_nt_destructible_impl<typename
853 remove_all_extents<_Tp>::type>::type
856 template<typename _Tp>
857 struct __is_nt_destructible_safe<_Tp, true, false>
858 : public false_type { };
860 template<typename _Tp>
861 struct __is_nt_destructible_safe<_Tp, false, true>
862 : public true_type { };
864 /// is_nothrow_destructible
865 template<typename _Tp>
866 struct is_nothrow_destructible
867 : public __is_nt_destructible_safe<_Tp>::type
870 struct __do_is_default_constructible_impl
872 template<typename _Tp, typename = decltype(_Tp())>
873 static true_type __test(int);
876 static false_type __test(...);
879 template<typename _Tp>
880 struct __is_default_constructible_impl
881 : public __do_is_default_constructible_impl
883 typedef decltype(__test<_Tp>(0)) type;
886 template<typename _Tp>
887 struct __is_default_constructible_atom
888 : public __and_<__not_<is_void<_Tp>>,
889 __is_default_constructible_impl<_Tp>>
892 template<typename _Tp, bool = is_array<_Tp>::value>
893 struct __is_default_constructible_safe;
895 // The following technique is a workaround for a current core language
896 // restriction, which does not allow for array types to occur in
897 // functional casts of the form T(). Complete arrays can be default-
898 // constructed, if the element type is default-constructible, but
899 // arrays with unknown bounds are not.
900 template<typename _Tp>
901 struct __is_default_constructible_safe<_Tp, true>
902 : public __and_<__is_array_known_bounds<_Tp>,
903 __is_default_constructible_atom<typename
904 remove_all_extents<_Tp>::type>>
907 template<typename _Tp>
908 struct __is_default_constructible_safe<_Tp, false>
909 : public __is_default_constructible_atom<_Tp>::type
912 /// is_default_constructible
913 template<typename _Tp>
914 struct is_default_constructible
915 : public __is_default_constructible_safe<_Tp>::type
919 template<typename _Tp, typename... _Args>
920 struct is_constructible
921 : public __bool_constant<__is_constructible(_Tp, _Args...)>
924 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
925 struct __is_copy_constructible_impl;
927 template<typename _Tp>
928 struct __is_copy_constructible_impl<_Tp, false>
929 : public false_type { };
931 template<typename _Tp>
932 struct __is_copy_constructible_impl<_Tp, true>
933 : public is_constructible<_Tp, const _Tp&>
936 /// is_copy_constructible
937 template<typename _Tp>
938 struct is_copy_constructible
939 : public __is_copy_constructible_impl<_Tp>
942 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
943 struct __is_move_constructible_impl;
945 template<typename _Tp>
946 struct __is_move_constructible_impl<_Tp, false>
947 : public false_type { };
949 template<typename _Tp>
950 struct __is_move_constructible_impl<_Tp, true>
951 : public is_constructible<_Tp, _Tp&&>
954 /// is_move_constructible
955 template<typename _Tp>
956 struct is_move_constructible
957 : public __is_move_constructible_impl<_Tp>
960 template<typename _Tp>
961 struct __is_nt_default_constructible_atom
962 : public integral_constant<bool, noexcept(_Tp())>
965 template<typename _Tp, bool = is_array<_Tp>::value>
966 struct __is_nt_default_constructible_impl;
968 template<typename _Tp>
969 struct __is_nt_default_constructible_impl<_Tp, true>
970 : public __and_<__is_array_known_bounds<_Tp>,
971 __is_nt_default_constructible_atom<typename
972 remove_all_extents<_Tp>::type>>
975 template<typename _Tp>
976 struct __is_nt_default_constructible_impl<_Tp, false>
977 : public __is_nt_default_constructible_atom<_Tp>
980 /// is_nothrow_default_constructible
981 template<typename _Tp>
982 struct is_nothrow_default_constructible
983 : public __and_<is_default_constructible<_Tp>,
984 __is_nt_default_constructible_impl<_Tp>>
987 template<typename _Tp, typename... _Args>
988 struct __is_nt_constructible_impl
989 : public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
992 template<typename _Tp, typename _Arg>
993 struct __is_nt_constructible_impl<_Tp, _Arg>
994 : public integral_constant<bool,
995 noexcept(static_cast<_Tp>(declval<_Arg>()))>
998 template<typename _Tp>
999 struct __is_nt_constructible_impl<_Tp>
1000 : public is_nothrow_default_constructible<_Tp>
1003 /// is_nothrow_constructible
1004 template<typename _Tp, typename... _Args>
1005 struct is_nothrow_constructible
1006 : public __and_<is_constructible<_Tp, _Args...>,
1007 __is_nt_constructible_impl<_Tp, _Args...>>
1010 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1011 struct __is_nothrow_copy_constructible_impl;
1013 template<typename _Tp>
1014 struct __is_nothrow_copy_constructible_impl<_Tp, false>
1015 : public false_type { };
1017 template<typename _Tp>
1018 struct __is_nothrow_copy_constructible_impl<_Tp, true>
1019 : public is_nothrow_constructible<_Tp, const _Tp&>
1022 /// is_nothrow_copy_constructible
1023 template<typename _Tp>
1024 struct is_nothrow_copy_constructible
1025 : public __is_nothrow_copy_constructible_impl<_Tp>
1028 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1029 struct __is_nothrow_move_constructible_impl;
1031 template<typename _Tp>
1032 struct __is_nothrow_move_constructible_impl<_Tp, false>
1033 : public false_type { };
1035 template<typename _Tp>
1036 struct __is_nothrow_move_constructible_impl<_Tp, true>
1037 : public is_nothrow_constructible<_Tp, _Tp&&>
1040 /// is_nothrow_move_constructible
1041 template<typename _Tp>
1042 struct is_nothrow_move_constructible
1043 : public __is_nothrow_move_constructible_impl<_Tp>
1047 template<typename _Tp, typename _Up>
1048 struct is_assignable
1049 : public __bool_constant<__is_assignable(_Tp, _Up)>
1052 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1053 struct __is_copy_assignable_impl;
1055 template<typename _Tp>
1056 struct __is_copy_assignable_impl<_Tp, false>
1057 : public false_type { };
1059 template<typename _Tp>
1060 struct __is_copy_assignable_impl<_Tp, true>
1061 : public is_assignable<_Tp&, const _Tp&>
1064 /// is_copy_assignable
1065 template<typename _Tp>
1066 struct is_copy_assignable
1067 : public __is_copy_assignable_impl<_Tp>
1070 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1071 struct __is_move_assignable_impl;
1073 template<typename _Tp>
1074 struct __is_move_assignable_impl<_Tp, false>
1075 : public false_type { };
1077 template<typename _Tp>
1078 struct __is_move_assignable_impl<_Tp, true>
1079 : public is_assignable<_Tp&, _Tp&&>
1082 /// is_move_assignable
1083 template<typename _Tp>
1084 struct is_move_assignable
1085 : public __is_move_assignable_impl<_Tp>
1088 template<typename _Tp, typename _Up>
1089 struct __is_nt_assignable_impl
1090 : public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())>
1093 /// is_nothrow_assignable
1094 template<typename _Tp, typename _Up>
1095 struct is_nothrow_assignable
1096 : public __and_<is_assignable<_Tp, _Up>,
1097 __is_nt_assignable_impl<_Tp, _Up>>
1100 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1101 struct __is_nt_copy_assignable_impl;
1103 template<typename _Tp>
1104 struct __is_nt_copy_assignable_impl<_Tp, false>
1105 : public false_type { };
1107 template<typename _Tp>
1108 struct __is_nt_copy_assignable_impl<_Tp, true>
1109 : public is_nothrow_assignable<_Tp&, const _Tp&>
1112 /// is_nothrow_copy_assignable
1113 template<typename _Tp>
1114 struct is_nothrow_copy_assignable
1115 : public __is_nt_copy_assignable_impl<_Tp>
1118 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1119 struct __is_nt_move_assignable_impl;
1121 template<typename _Tp>
1122 struct __is_nt_move_assignable_impl<_Tp, false>
1123 : public false_type { };
1125 template<typename _Tp>
1126 struct __is_nt_move_assignable_impl<_Tp, true>
1127 : public is_nothrow_assignable<_Tp&, _Tp&&>
1130 /// is_nothrow_move_assignable
1131 template<typename _Tp>
1132 struct is_nothrow_move_assignable
1133 : public __is_nt_move_assignable_impl<_Tp>
1136 /// is_trivially_constructible
1137 template<typename _Tp, typename... _Args>
1138 struct is_trivially_constructible
1139 : public __and_<is_constructible<_Tp, _Args...>, __bool_constant<
1140 __is_trivially_constructible(_Tp, _Args...)>>::type
1143 /// is_trivially_default_constructible
1144 template<typename _Tp>
1145 struct is_trivially_default_constructible
1146 : public is_trivially_constructible<_Tp>::type
1149 struct __do_is_implicitly_default_constructible_impl
1151 template <typename _Tp>
1152 static void __helper(const _Tp&);
1154 template <typename _Tp>
1155 static true_type __test(const _Tp&,
1156 decltype(__helper<const _Tp&>({}))* = 0);
1158 static false_type __test(...);
1161 template<typename _Tp>
1162 struct __is_implicitly_default_constructible_impl
1163 : public __do_is_implicitly_default_constructible_impl
1165 typedef decltype(__test(declval<_Tp>())) type;
1168 template<typename _Tp>
1169 struct __is_implicitly_default_constructible_safe
1170 : public __is_implicitly_default_constructible_impl<_Tp>::type
1173 template <typename _Tp>
1174 struct __is_implicitly_default_constructible
1175 : public __and_<is_default_constructible<_Tp>,
1176 __is_implicitly_default_constructible_safe<_Tp>>
1179 /// is_trivially_copy_constructible
1181 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1182 struct __is_trivially_copy_constructible_impl;
1184 template<typename _Tp>
1185 struct __is_trivially_copy_constructible_impl<_Tp, false>
1186 : public false_type { };
1188 template<typename _Tp>
1189 struct __is_trivially_copy_constructible_impl<_Tp, true>
1190 : public __and_<is_copy_constructible<_Tp>,
1191 integral_constant<bool,
1192 __is_trivially_constructible(_Tp, const _Tp&)>>
1195 template<typename _Tp>
1196 struct is_trivially_copy_constructible
1197 : public __is_trivially_copy_constructible_impl<_Tp>
1200 /// is_trivially_move_constructible
1202 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1203 struct __is_trivially_move_constructible_impl;
1205 template<typename _Tp>
1206 struct __is_trivially_move_constructible_impl<_Tp, false>
1207 : public false_type { };
1209 template<typename _Tp>
1210 struct __is_trivially_move_constructible_impl<_Tp, true>
1211 : public __and_<is_move_constructible<_Tp>,
1212 integral_constant<bool,
1213 __is_trivially_constructible(_Tp, _Tp&&)>>
1216 template<typename _Tp>
1217 struct is_trivially_move_constructible
1218 : public __is_trivially_move_constructible_impl<_Tp>
1221 /// is_trivially_assignable
1222 template<typename _Tp, typename _Up>
1223 struct is_trivially_assignable
1224 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1227 /// is_trivially_copy_assignable
1229 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1230 struct __is_trivially_copy_assignable_impl;
1232 template<typename _Tp>
1233 struct __is_trivially_copy_assignable_impl<_Tp, false>
1234 : public false_type { };
1236 template<typename _Tp>
1237 struct __is_trivially_copy_assignable_impl<_Tp, true>
1238 : public __and_<is_copy_assignable<_Tp>,
1239 integral_constant<bool,
1240 __is_trivially_assignable(_Tp&, const _Tp&)>>
1243 template<typename _Tp>
1244 struct is_trivially_copy_assignable
1245 : public __is_trivially_copy_assignable_impl<_Tp>
1248 /// is_trivially_move_assignable
1250 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1251 struct __is_trivially_move_assignable_impl;
1253 template<typename _Tp>
1254 struct __is_trivially_move_assignable_impl<_Tp, false>
1255 : public false_type { };
1257 template<typename _Tp>
1258 struct __is_trivially_move_assignable_impl<_Tp, true>
1259 : public __and_<is_move_assignable<_Tp>,
1260 integral_constant<bool,
1261 __is_trivially_assignable(_Tp&, _Tp&&)>>
1264 template<typename _Tp>
1265 struct is_trivially_move_assignable
1266 : public __is_trivially_move_assignable_impl<_Tp>
1269 /// is_trivially_destructible
1270 template<typename _Tp>
1271 struct is_trivially_destructible
1272 : public __and_<is_destructible<_Tp>, integral_constant<bool,
1273 __has_trivial_destructor(_Tp)>>
1277 /// has_virtual_destructor
1278 template<typename _Tp>
1279 struct has_virtual_destructor
1280 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1284 // type property queries.
1287 template<typename _Tp>
1289 : public integral_constant<std::size_t, alignof(_Tp)> { };
1294 : public integral_constant<std::size_t, 0> { };
1296 template<typename _Tp, std::size_t _Size>
1297 struct rank<_Tp[_Size]>
1298 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1300 template<typename _Tp>
1302 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1305 template<typename, unsigned _Uint>
1307 : public integral_constant<std::size_t, 0> { };
1309 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1310 struct extent<_Tp[_Size], _Uint>
1311 : public integral_constant<std::size_t,
1312 _Uint == 0 ? _Size : extent<_Tp,
1316 template<typename _Tp, unsigned _Uint>
1317 struct extent<_Tp[], _Uint>
1318 : public integral_constant<std::size_t,
1319 _Uint == 0 ? 0 : extent<_Tp,
1327 template<typename, typename>
1329 : public false_type { };
1331 template<typename _Tp>
1332 struct is_same<_Tp, _Tp>
1333 : public true_type { };
1336 template<typename _Base, typename _Derived>
1338 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1341 template<typename _From, typename _To,
1342 bool = __or_<is_void<_From>, is_function<_To>,
1343 is_array<_To>>::value>
1344 struct __is_convertible_helper
1345 { typedef typename is_void<_To>::type type; };
1347 template<typename _From, typename _To>
1348 class __is_convertible_helper<_From, _To, false>
1350 template<typename _To1>
1351 static void __test_aux(_To1);
1353 template<typename _From1, typename _To1,
1354 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1358 template<typename, typename>
1363 typedef decltype(__test<_From, _To>(0)) type;
1368 template<typename _From, typename _To>
1369 struct is_convertible
1370 : public __is_convertible_helper<_From, _To>::type
1374 // Const-volatile modifications.
1377 template<typename _Tp>
1379 { typedef _Tp type; };
1381 template<typename _Tp>
1382 struct remove_const<_Tp const>
1383 { typedef _Tp type; };
1386 template<typename _Tp>
1387 struct remove_volatile
1388 { typedef _Tp type; };
1390 template<typename _Tp>
1391 struct remove_volatile<_Tp volatile>
1392 { typedef _Tp type; };
1395 template<typename _Tp>
1399 remove_const<typename remove_volatile<_Tp>::type>::type type;
1403 template<typename _Tp>
1405 { typedef _Tp const type; };
1408 template<typename _Tp>
1410 { typedef _Tp volatile type; };
1413 template<typename _Tp>
1417 add_const<typename add_volatile<_Tp>::type>::type type;
1420 #if __cplusplus > 201103L
1422 #define __cpp_lib_transformation_trait_aliases 201304
1424 /// Alias template for remove_const
1425 template<typename _Tp>
1426 using remove_const_t = typename remove_const<_Tp>::type;
1428 /// Alias template for remove_volatile
1429 template<typename _Tp>
1430 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1432 /// Alias template for remove_cv
1433 template<typename _Tp>
1434 using remove_cv_t = typename remove_cv<_Tp>::type;
1436 /// Alias template for add_const
1437 template<typename _Tp>
1438 using add_const_t = typename add_const<_Tp>::type;
1440 /// Alias template for add_volatile
1441 template<typename _Tp>
1442 using add_volatile_t = typename add_volatile<_Tp>::type;
1444 /// Alias template for add_cv
1445 template<typename _Tp>
1446 using add_cv_t = typename add_cv<_Tp>::type;
1449 // Reference transformations.
1451 /// remove_reference
1452 template<typename _Tp>
1453 struct remove_reference
1454 { typedef _Tp type; };
1456 template<typename _Tp>
1457 struct remove_reference<_Tp&>
1458 { typedef _Tp type; };
1460 template<typename _Tp>
1461 struct remove_reference<_Tp&&>
1462 { typedef _Tp type; };
1464 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1465 struct __add_lvalue_reference_helper
1466 { typedef _Tp type; };
1468 template<typename _Tp>
1469 struct __add_lvalue_reference_helper<_Tp, true>
1470 { typedef _Tp& type; };
1472 /// add_lvalue_reference
1473 template<typename _Tp>
1474 struct add_lvalue_reference
1475 : public __add_lvalue_reference_helper<_Tp>
1478 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1479 struct __add_rvalue_reference_helper
1480 { typedef _Tp type; };
1482 template<typename _Tp>
1483 struct __add_rvalue_reference_helper<_Tp, true>
1484 { typedef _Tp&& type; };
1486 /// add_rvalue_reference
1487 template<typename _Tp>
1488 struct add_rvalue_reference
1489 : public __add_rvalue_reference_helper<_Tp>
1492 #if __cplusplus > 201103L
1493 /// Alias template for remove_reference
1494 template<typename _Tp>
1495 using remove_reference_t = typename remove_reference<_Tp>::type;
1497 /// Alias template for add_lvalue_reference
1498 template<typename _Tp>
1499 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1501 /// Alias template for add_rvalue_reference
1502 template<typename _Tp>
1503 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1506 // Sign modifications.
1508 // Utility for constructing identically cv-qualified types.
1509 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1510 struct __cv_selector;
1512 template<typename _Unqualified>
1513 struct __cv_selector<_Unqualified, false, false>
1514 { typedef _Unqualified __type; };
1516 template<typename _Unqualified>
1517 struct __cv_selector<_Unqualified, false, true>
1518 { typedef volatile _Unqualified __type; };
1520 template<typename _Unqualified>
1521 struct __cv_selector<_Unqualified, true, false>
1522 { typedef const _Unqualified __type; };
1524 template<typename _Unqualified>
1525 struct __cv_selector<_Unqualified, true, true>
1526 { typedef const volatile _Unqualified __type; };
1528 template<typename _Qualified, typename _Unqualified,
1529 bool _IsConst = is_const<_Qualified>::value,
1530 bool _IsVol = is_volatile<_Qualified>::value>
1531 class __match_cv_qualifiers
1533 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1536 typedef typename __match::__type __type;
1539 // Utility for finding the unsigned versions of signed integral types.
1540 template<typename _Tp>
1541 struct __make_unsigned
1542 { typedef _Tp __type; };
1545 struct __make_unsigned<char>
1546 { typedef unsigned char __type; };
1549 struct __make_unsigned<signed char>
1550 { typedef unsigned char __type; };
1553 struct __make_unsigned<short>
1554 { typedef unsigned short __type; };
1557 struct __make_unsigned<int>
1558 { typedef unsigned int __type; };
1561 struct __make_unsigned<long>
1562 { typedef unsigned long __type; };
1565 struct __make_unsigned<long long>
1566 { typedef unsigned long long __type; };
1568 #if defined(__GLIBCXX_TYPE_INT_N_0)
1570 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1571 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1573 #if defined(__GLIBCXX_TYPE_INT_N_1)
1575 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1576 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1578 #if defined(__GLIBCXX_TYPE_INT_N_2)
1580 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1581 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1583 #if defined(__GLIBCXX_TYPE_INT_N_3)
1585 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1586 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1589 // Select between integral and enum: not possible to be both.
1590 template<typename _Tp,
1591 bool _IsInt = is_integral<_Tp>::value,
1592 bool _IsEnum = is_enum<_Tp>::value>
1593 class __make_unsigned_selector;
1595 template<typename _Tp>
1596 class __make_unsigned_selector<_Tp, true, false>
1598 typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt;
1599 typedef typename __unsignedt::__type __unsigned_type;
1600 typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
1603 typedef typename __cv_unsigned::__type __type;
1606 template<typename _Tp>
1607 class __make_unsigned_selector<_Tp, false, true>
1609 // With -fshort-enums, an enum may be as small as a char.
1610 typedef unsigned char __smallest;
1611 static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
1612 static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
1613 static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
1614 static const bool __b3 = sizeof(_Tp) <= sizeof(unsigned long);
1615 typedef conditional<__b3, unsigned long, unsigned long long> __cond3;
1616 typedef typename __cond3::type __cond3_type;
1617 typedef conditional<__b2, unsigned int, __cond3_type> __cond2;
1618 typedef typename __cond2::type __cond2_type;
1619 typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
1620 typedef typename __cond1::type __cond1_type;
1622 typedef typename conditional<__b0, __smallest, __cond1_type>::type
1624 typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
1627 typedef typename __cv_unsigned::__type __type;
1630 // Given an integral/enum type, return the corresponding unsigned
1632 // Primary template.
1634 template<typename _Tp>
1635 struct make_unsigned
1636 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1638 // Integral, but don't define.
1640 struct make_unsigned<bool>;
1643 // Utility for finding the signed versions of unsigned integral types.
1644 template<typename _Tp>
1645 struct __make_signed
1646 { typedef _Tp __type; };
1649 struct __make_signed<char>
1650 { typedef signed char __type; };
1653 struct __make_signed<unsigned char>
1654 { typedef signed char __type; };
1657 struct __make_signed<unsigned short>
1658 { typedef signed short __type; };
1661 struct __make_signed<unsigned int>
1662 { typedef signed int __type; };
1665 struct __make_signed<unsigned long>
1666 { typedef signed long __type; };
1669 struct __make_signed<unsigned long long>
1670 { typedef signed long long __type; };
1672 #if defined(__GLIBCXX_TYPE_INT_N_0)
1674 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1675 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1677 #if defined(__GLIBCXX_TYPE_INT_N_1)
1679 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1680 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1682 #if defined(__GLIBCXX_TYPE_INT_N_2)
1684 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1685 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1687 #if defined(__GLIBCXX_TYPE_INT_N_3)
1689 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1690 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1693 // Select between integral and enum: not possible to be both.
1694 template<typename _Tp,
1695 bool _IsInt = is_integral<_Tp>::value,
1696 bool _IsEnum = is_enum<_Tp>::value>
1697 class __make_signed_selector;
1699 template<typename _Tp>
1700 class __make_signed_selector<_Tp, true, false>
1702 typedef __make_signed<typename remove_cv<_Tp>::type> __signedt;
1703 typedef typename __signedt::__type __signed_type;
1704 typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
1707 typedef typename __cv_signed::__type __type;
1710 template<typename _Tp>
1711 class __make_signed_selector<_Tp, false, true>
1713 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1716 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1719 // Given an integral/enum type, return the corresponding signed
1721 // Primary template.
1723 template<typename _Tp>
1725 { typedef typename __make_signed_selector<_Tp>::__type type; };
1727 // Integral, but don't define.
1729 struct make_signed<bool>;
1731 #if __cplusplus > 201103L
1732 /// Alias template for make_signed
1733 template<typename _Tp>
1734 using make_signed_t = typename make_signed<_Tp>::type;
1736 /// Alias template for make_unsigned
1737 template<typename _Tp>
1738 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1741 // Array modifications.
1744 template<typename _Tp>
1745 struct remove_extent
1746 { typedef _Tp type; };
1748 template<typename _Tp, std::size_t _Size>
1749 struct remove_extent<_Tp[_Size]>
1750 { typedef _Tp type; };
1752 template<typename _Tp>
1753 struct remove_extent<_Tp[]>
1754 { typedef _Tp type; };
1756 /// remove_all_extents
1757 template<typename _Tp>
1758 struct remove_all_extents
1759 { typedef _Tp type; };
1761 template<typename _Tp, std::size_t _Size>
1762 struct remove_all_extents<_Tp[_Size]>
1763 { typedef typename remove_all_extents<_Tp>::type type; };
1765 template<typename _Tp>
1766 struct remove_all_extents<_Tp[]>
1767 { typedef typename remove_all_extents<_Tp>::type type; };
1769 #if __cplusplus > 201103L
1770 /// Alias template for remove_extent
1771 template<typename _Tp>
1772 using remove_extent_t = typename remove_extent<_Tp>::type;
1774 /// Alias template for remove_all_extents
1775 template<typename _Tp>
1776 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1779 // Pointer modifications.
1781 template<typename _Tp, typename>
1782 struct __remove_pointer_helper
1783 { typedef _Tp type; };
1785 template<typename _Tp, typename _Up>
1786 struct __remove_pointer_helper<_Tp, _Up*>
1787 { typedef _Up type; };
1790 template<typename _Tp>
1791 struct remove_pointer
1792 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1796 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1797 is_void<_Tp>>::value>
1798 struct __add_pointer_helper
1799 { typedef _Tp type; };
1801 template<typename _Tp>
1802 struct __add_pointer_helper<_Tp, true>
1803 { typedef typename remove_reference<_Tp>::type* type; };
1805 template<typename _Tp>
1807 : public __add_pointer_helper<_Tp>
1810 #if __cplusplus > 201103L
1811 /// Alias template for remove_pointer
1812 template<typename _Tp>
1813 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1815 /// Alias template for add_pointer
1816 template<typename _Tp>
1817 using add_pointer_t = typename add_pointer<_Tp>::type;
1820 template<std::size_t _Len>
1821 struct __aligned_storage_msa
1825 unsigned char __data[_Len];
1826 struct __attribute__((__aligned__)) { } __align;
1831 * @brief Alignment type.
1833 * The value of _Align is a default-alignment which shall be the
1834 * most stringent alignment requirement for any C++ object type
1835 * whose size is no greater than _Len (3.9). The member typedef
1836 * type shall be a POD type suitable for use as uninitialized
1837 * storage for any object whose size is at most _Len and whose
1838 * alignment is a divisor of _Align.
1840 template<std::size_t _Len, std::size_t _Align =
1841 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1842 struct aligned_storage
1846 unsigned char __data[_Len];
1847 struct __attribute__((__aligned__((_Align)))) { } __align;
1851 template <typename... _Types>
1852 struct __strictest_alignment
1854 static const size_t _S_alignment = 0;
1855 static const size_t _S_size = 0;
1858 template <typename _Tp, typename... _Types>
1859 struct __strictest_alignment<_Tp, _Types...>
1861 static const size_t _S_alignment =
1862 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1863 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1864 static const size_t _S_size =
1865 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1866 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
1870 * @brief Provide aligned storage for types.
1872 * [meta.trans.other]
1874 * Provides aligned storage for any of the provided types of at
1877 * @see aligned_storage
1879 template <size_t _Len, typename... _Types>
1880 struct aligned_union
1883 static_assert(sizeof...(_Types) != 0, "At least one type is required");
1885 using __strictest = __strictest_alignment<_Types...>;
1886 static const size_t _S_len = _Len > __strictest::_S_size
1887 ? _Len : __strictest::_S_size;
1889 /// The value of the strictest alignment of _Types.
1890 static const size_t alignment_value = __strictest::_S_alignment;
1892 typedef typename aligned_storage<_S_len, alignment_value>::type type;
1895 template <size_t _Len, typename... _Types>
1896 const size_t aligned_union<_Len, _Types...>::alignment_value;
1898 // Decay trait for arrays and functions, used for perfect forwarding
1899 // in make_pair, make_tuple, etc.
1900 template<typename _Up,
1901 bool _IsArray = is_array<_Up>::value,
1902 bool _IsFunction = is_function<_Up>::value>
1903 struct __decay_selector;
1906 template<typename _Up>
1907 struct __decay_selector<_Up, false, false>
1908 { typedef typename remove_cv<_Up>::type __type; };
1910 template<typename _Up>
1911 struct __decay_selector<_Up, true, false>
1912 { typedef typename remove_extent<_Up>::type* __type; };
1914 template<typename _Up>
1915 struct __decay_selector<_Up, false, true>
1916 { typedef typename add_pointer<_Up>::type __type; };
1919 template<typename _Tp>
1922 typedef typename remove_reference<_Tp>::type __remove_type;
1925 typedef typename __decay_selector<__remove_type>::__type type;
1928 template<typename _Tp>
1929 class reference_wrapper;
1931 // Helper which adds a reference to a type when given a reference_wrapper
1932 template<typename _Tp>
1933 struct __strip_reference_wrapper
1938 template<typename _Tp>
1939 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
1941 typedef _Tp& __type;
1944 template<typename _Tp>
1945 struct __decay_and_strip
1947 typedef typename __strip_reference_wrapper<
1948 typename decay<_Tp>::type>::__type __type;
1952 // Primary template.
1953 /// Define a member typedef @c type only if a boolean constant is true.
1954 template<bool, typename _Tp = void>
1958 // Partial specialization for true.
1959 template<typename _Tp>
1960 struct enable_if<true, _Tp>
1961 { typedef _Tp type; };
1963 template<typename... _Cond>
1964 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
1966 // Primary template.
1967 /// Define a member typedef @c type to one of two argument types.
1968 template<bool _Cond, typename _Iftrue, typename _Iffalse>
1970 { typedef _Iftrue type; };
1972 // Partial specialization for false.
1973 template<typename _Iftrue, typename _Iffalse>
1974 struct conditional<false, _Iftrue, _Iffalse>
1975 { typedef _Iffalse type; };
1978 template<typename... _Tp>
1981 // Sfinae-friendly common_type implementation:
1983 struct __do_common_type_impl
1985 template<typename _Tp, typename _Up>
1986 static __success_type<typename decay<decltype
1987 (true ? std::declval<_Tp>()
1988 : std::declval<_Up>())>::type> _S_test(int);
1990 template<typename, typename>
1991 static __failure_type _S_test(...);
1994 template<typename _Tp, typename _Up>
1995 struct __common_type_impl
1996 : private __do_common_type_impl
1998 typedef decltype(_S_test<_Tp, _Up>(0)) type;
2001 struct __do_member_type_wrapper
2003 template<typename _Tp>
2004 static __success_type<typename _Tp::type> _S_test(int);
2007 static __failure_type _S_test(...);
2010 template<typename _Tp>
2011 struct __member_type_wrapper
2012 : private __do_member_type_wrapper
2014 typedef decltype(_S_test<_Tp>(0)) type;
2017 template<typename _CTp, typename... _Args>
2018 struct __expanded_common_type_wrapper
2020 typedef common_type<typename _CTp::type, _Args...> type;
2023 template<typename... _Args>
2024 struct __expanded_common_type_wrapper<__failure_type, _Args...>
2025 { typedef __failure_type type; };
2027 template<typename _Tp>
2028 struct common_type<_Tp>
2029 { typedef typename decay<_Tp>::type type; };
2031 template<typename _Tp, typename _Up>
2032 struct common_type<_Tp, _Up>
2033 : public __common_type_impl<_Tp, _Up>::type
2036 template<typename _Tp, typename _Up, typename... _Vp>
2037 struct common_type<_Tp, _Up, _Vp...>
2038 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
2039 common_type<_Tp, _Up>>::type, _Vp...>::type
2042 /// The underlying type of an enum.
2043 template<typename _Tp>
2044 struct underlying_type
2046 typedef __underlying_type(_Tp) type;
2049 template<typename _Tp>
2050 struct __declval_protector
2052 static const bool __stop = false;
2055 template<typename _Tp>
2056 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2058 static_assert(__declval_protector<_Tp>::__stop,
2059 "declval() must not be used!");
2060 return __declval<_Tp>(0);
2063 // wchar_t, char16_t and char32_t are integral types but are neither
2064 // signed integer types nor unsigned integer types, so must be
2065 // transformed to the integer type with the smallest rank that has the
2066 // same size and signedness.
2067 // Use the partial specialization for enumeration types to do that,
2068 // which means these explicit specializations must be defined after
2069 // std::conditional has been defined.
2071 #if defined(_GLIBCXX_USE_WCHAR_T)
2073 struct __make_unsigned<wchar_t>
2076 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
2080 struct __make_signed<wchar_t>
2083 = typename __make_signed_selector<wchar_t, false, true>::__type;
2088 struct __make_unsigned<char16_t>
2091 = typename __make_unsigned_selector<char16_t, false, true>::__type;
2095 struct __make_signed<char16_t>
2098 = typename __make_signed_selector<char16_t, false, true>::__type;
2102 struct __make_unsigned<char32_t>
2105 = typename __make_unsigned_selector<char32_t, false, true>::__type;
2109 struct __make_signed<char32_t>
2112 = typename __make_signed_selector<char32_t, false, true>::__type;
2117 template<typename _Signature>
2120 // Sfinae-friendly result_of implementation:
2122 #define __cpp_lib_result_of_sfinae 201210
2124 struct __invoke_memfun_ref { };
2125 struct __invoke_memfun_deref { };
2126 struct __invoke_memobj_ref { };
2127 struct __invoke_memobj_deref { };
2128 struct __invoke_other { };
2130 // Associate a tag type with a specialization of __success_type.
2131 template<typename _Tp, typename _Tag>
2132 struct __result_of_success : __success_type<_Tp>
2133 { using __invoke_type = _Tag; };
2135 // [func.require] paragraph 1 bullet 1:
2136 struct __result_of_memfun_ref_impl
2138 template<typename _Fp, typename _Tp1, typename... _Args>
2139 static __result_of_success<decltype(
2140 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2141 ), __invoke_memfun_ref> _S_test(int);
2143 template<typename...>
2144 static __failure_type _S_test(...);
2147 template<typename _MemPtr, typename _Arg, typename... _Args>
2148 struct __result_of_memfun_ref
2149 : private __result_of_memfun_ref_impl
2151 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2154 // [func.require] paragraph 1 bullet 2:
2155 struct __result_of_memfun_deref_impl
2157 template<typename _Fp, typename _Tp1, typename... _Args>
2158 static __result_of_success<decltype(
2159 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2160 ), __invoke_memfun_deref> _S_test(int);
2162 template<typename...>
2163 static __failure_type _S_test(...);
2166 template<typename _MemPtr, typename _Arg, typename... _Args>
2167 struct __result_of_memfun_deref
2168 : private __result_of_memfun_deref_impl
2170 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2173 // [func.require] paragraph 1 bullet 3:
2174 struct __result_of_memobj_ref_impl
2176 template<typename _Fp, typename _Tp1>
2177 static __result_of_success<decltype(
2178 std::declval<_Tp1>().*std::declval<_Fp>()
2179 ), __invoke_memobj_ref> _S_test(int);
2181 template<typename, typename>
2182 static __failure_type _S_test(...);
2185 template<typename _MemPtr, typename _Arg>
2186 struct __result_of_memobj_ref
2187 : private __result_of_memobj_ref_impl
2189 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2192 // [func.require] paragraph 1 bullet 4:
2193 struct __result_of_memobj_deref_impl
2195 template<typename _Fp, typename _Tp1>
2196 static __result_of_success<decltype(
2197 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2198 ), __invoke_memobj_deref> _S_test(int);
2200 template<typename, typename>
2201 static __failure_type _S_test(...);
2204 template<typename _MemPtr, typename _Arg>
2205 struct __result_of_memobj_deref
2206 : private __result_of_memobj_deref_impl
2208 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2211 template<typename _MemPtr, typename _Arg>
2212 struct __result_of_memobj;
2214 template<typename _Res, typename _Class, typename _Arg>
2215 struct __result_of_memobj<_Res _Class::*, _Arg>
2217 typedef typename remove_cv<typename remove_reference<
2218 _Arg>::type>::type _Argval;
2219 typedef _Res _Class::* _MemPtr;
2220 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2221 is_base_of<_Class, _Argval>>::value,
2222 __result_of_memobj_ref<_MemPtr, _Arg>,
2223 __result_of_memobj_deref<_MemPtr, _Arg>
2227 template<typename _MemPtr, typename _Arg, typename... _Args>
2228 struct __result_of_memfun;
2230 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2231 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2233 typedef typename remove_cv<typename remove_reference<
2234 _Arg>::type>::type _Argval;
2235 typedef _Res _Class::* _MemPtr;
2236 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2237 is_base_of<_Class, _Argval>>::value,
2238 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2239 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2243 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2244 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2245 // as the object expression
2247 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2248 template<typename _Tp, typename _Up = typename decay<_Tp>::type>
2254 template<typename _Tp, typename _Up>
2255 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2260 template<bool, bool, typename _Functor, typename... _ArgTypes>
2261 struct __result_of_impl
2263 typedef __failure_type type;
2266 template<typename _MemPtr, typename _Arg>
2267 struct __result_of_impl<true, false, _MemPtr, _Arg>
2268 : public __result_of_memobj<typename decay<_MemPtr>::type,
2269 typename __inv_unwrap<_Arg>::type>
2272 template<typename _MemPtr, typename _Arg, typename... _Args>
2273 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2274 : public __result_of_memfun<typename decay<_MemPtr>::type,
2275 typename __inv_unwrap<_Arg>::type, _Args...>
2278 // [func.require] paragraph 1 bullet 5:
2279 struct __result_of_other_impl
2281 template<typename _Fn, typename... _Args>
2282 static __result_of_success<decltype(
2283 std::declval<_Fn>()(std::declval<_Args>()...)
2284 ), __invoke_other> _S_test(int);
2286 template<typename...>
2287 static __failure_type _S_test(...);
2290 template<typename _Functor, typename... _ArgTypes>
2291 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2292 : private __result_of_other_impl
2294 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2297 // __invoke_result (std::invoke_result for C++11)
2298 template<typename _Functor, typename... _ArgTypes>
2299 struct __invoke_result
2300 : public __result_of_impl<
2301 is_member_object_pointer<
2302 typename remove_reference<_Functor>::type
2304 is_member_function_pointer<
2305 typename remove_reference<_Functor>::type
2307 _Functor, _ArgTypes...
2311 template<typename _Functor, typename... _ArgTypes>
2312 struct result_of<_Functor(_ArgTypes...)>
2313 : public __invoke_result<_Functor, _ArgTypes...>
2316 #if __cplusplus >= 201402L
2317 /// Alias template for aligned_storage
2318 template<size_t _Len, size_t _Align =
2319 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2320 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2322 template <size_t _Len, typename... _Types>
2323 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2325 /// Alias template for decay
2326 template<typename _Tp>
2327 using decay_t = typename decay<_Tp>::type;
2329 /// Alias template for enable_if
2330 template<bool _Cond, typename _Tp = void>
2331 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2333 /// Alias template for conditional
2334 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2335 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2337 /// Alias template for common_type
2338 template<typename... _Tp>
2339 using common_type_t = typename common_type<_Tp...>::type;
2341 /// Alias template for underlying_type
2342 template<typename _Tp>
2343 using underlying_type_t = typename underlying_type<_Tp>::type;
2345 /// Alias template for result_of
2346 template<typename _Tp>
2347 using result_of_t = typename result_of<_Tp>::type;
2350 // __enable_if_t (std::enable_if_t for C++11)
2351 template<bool _Cond, typename _Tp = void>
2352 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2354 // __void_t (std::void_t for C++11)
2355 template<typename...> using __void_t = void;
2357 #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2358 #define __cpp_lib_void_t 201411
2359 /// A metafunction that always yields void, used for detecting valid types.
2360 template<typename...> using void_t = void;
2363 /// Implementation of the detection idiom (negative case).
2364 template<typename _Default, typename _AlwaysVoid,
2365 template<typename...> class _Op, typename... _Args>
2368 using value_t = false_type;
2369 using type = _Default;
2372 /// Implementation of the detection idiom (positive case).
2373 template<typename _Default, template<typename...> class _Op,
2375 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2377 using value_t = true_type;
2378 using type = _Op<_Args...>;
2381 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2382 template<typename _Default, template<typename...> class _Op,
2384 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2386 // _Op<_Args...> if that is a valid type, otherwise _Default.
2387 template<typename _Default, template<typename...> class _Op,
2389 using __detected_or_t
2390 = typename __detected_or<_Default, _Op, _Args...>::type;
2392 /// @} group metaprogramming
2395 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2396 * member type _NTYPE.
2398 #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2399 template<typename _Tp, typename = __void_t<>> \
2400 struct __has_##_NTYPE \
2403 template<typename _Tp> \
2404 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2408 template <typename _Tp>
2409 struct __is_swappable;
2411 template <typename _Tp>
2412 struct __is_nothrow_swappable;
2414 template<typename... _Elements>
2418 struct __is_tuple_like_impl : false_type
2421 template<typename... _Tps>
2422 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2425 // Internal type trait that allows us to sfinae-protect tuple_cat.
2426 template<typename _Tp>
2427 struct __is_tuple_like
2428 : public __is_tuple_like_impl<typename remove_cv<
2429 typename remove_reference<_Tp>::type>::type>::type
2432 template<typename _Tp>
2434 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2435 is_move_constructible<_Tp>,
2436 is_move_assignable<_Tp>>::value>::type
2438 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2439 is_nothrow_move_assignable<_Tp>>::value);
2441 template<typename _Tp, size_t _Nm>
2443 typename enable_if<__is_swappable<_Tp>::value>::type
2444 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2445 noexcept(__is_nothrow_swappable<_Tp>::value);
2447 namespace __swappable_details {
2450 struct __do_is_swappable_impl
2452 template<typename _Tp, typename
2453 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2454 static true_type __test(int);
2457 static false_type __test(...);
2460 struct __do_is_nothrow_swappable_impl
2462 template<typename _Tp>
2463 static __bool_constant<
2464 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2468 static false_type __test(...);
2471 } // namespace __swappable_details
2473 template<typename _Tp>
2474 struct __is_swappable_impl
2475 : public __swappable_details::__do_is_swappable_impl
2477 typedef decltype(__test<_Tp>(0)) type;
2480 template<typename _Tp>
2481 struct __is_nothrow_swappable_impl
2482 : public __swappable_details::__do_is_nothrow_swappable_impl
2484 typedef decltype(__test<_Tp>(0)) type;
2487 template<typename _Tp>
2488 struct __is_swappable
2489 : public __is_swappable_impl<_Tp>::type
2492 template<typename _Tp>
2493 struct __is_nothrow_swappable
2494 : public __is_nothrow_swappable_impl<_Tp>::type
2497 #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2498 #define __cpp_lib_is_swappable 201603
2499 /// Metafunctions used for detecting swappable types: p0185r1
2502 template<typename _Tp>
2504 : public __is_swappable_impl<_Tp>::type
2507 /// is_nothrow_swappable
2508 template<typename _Tp>
2509 struct is_nothrow_swappable
2510 : public __is_nothrow_swappable_impl<_Tp>::type
2513 #if __cplusplus >= 201402L
2515 template<typename _Tp>
2516 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2517 is_swappable<_Tp>::value;
2519 /// is_nothrow_swappable_v
2520 template<typename _Tp>
2521 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2522 is_nothrow_swappable<_Tp>::value;
2523 #endif // __cplusplus >= 201402L
2525 namespace __swappable_with_details {
2528 struct __do_is_swappable_with_impl
2530 template<typename _Tp, typename _Up, typename
2531 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2533 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2534 static true_type __test(int);
2536 template<typename, typename>
2537 static false_type __test(...);
2540 struct __do_is_nothrow_swappable_with_impl
2542 template<typename _Tp, typename _Up>
2543 static __bool_constant<
2544 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2546 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2549 template<typename, typename>
2550 static false_type __test(...);
2553 } // namespace __swappable_with_details
2555 template<typename _Tp, typename _Up>
2556 struct __is_swappable_with_impl
2557 : public __swappable_with_details::__do_is_swappable_with_impl
2559 typedef decltype(__test<_Tp, _Up>(0)) type;
2562 // Optimization for the homogenous lvalue case, not required:
2563 template<typename _Tp>
2564 struct __is_swappable_with_impl<_Tp&, _Tp&>
2565 : public __swappable_details::__do_is_swappable_impl
2567 typedef decltype(__test<_Tp&>(0)) type;
2570 template<typename _Tp, typename _Up>
2571 struct __is_nothrow_swappable_with_impl
2572 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2574 typedef decltype(__test<_Tp, _Up>(0)) type;
2577 // Optimization for the homogenous lvalue case, not required:
2578 template<typename _Tp>
2579 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2580 : public __swappable_details::__do_is_nothrow_swappable_impl
2582 typedef decltype(__test<_Tp&>(0)) type;
2585 /// is_swappable_with
2586 template<typename _Tp, typename _Up>
2587 struct is_swappable_with
2588 : public __is_swappable_with_impl<_Tp, _Up>::type
2591 /// is_nothrow_swappable_with
2592 template<typename _Tp, typename _Up>
2593 struct is_nothrow_swappable_with
2594 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2597 #if __cplusplus >= 201402L
2598 /// is_swappable_with_v
2599 template<typename _Tp, typename _Up>
2600 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2601 is_swappable_with<_Tp, _Up>::value;
2603 /// is_nothrow_swappable_with_v
2604 template<typename _Tp, typename _Up>
2605 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2606 is_nothrow_swappable_with<_Tp, _Up>::value;
2607 #endif // __cplusplus >= 201402L
2609 #endif// c++1z or gnu++11
2611 // __is_invocable (std::is_invocable for C++11)
2613 template<typename _Result, typename _Ret, typename = void>
2614 struct __is_invocable_impl : false_type { };
2616 template<typename _Result, typename _Ret>
2617 struct __is_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>>
2618 : __or_<is_void<_Ret>, is_convertible<typename _Result::type, _Ret>>::type
2621 template<typename _Fn, typename... _ArgTypes>
2622 struct __is_invocable
2623 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2626 template<typename _Fn, typename _Tp, typename... _Args>
2627 constexpr bool __call_is_nt(__invoke_memfun_ref)
2629 using _Up = typename __inv_unwrap<_Tp>::type;
2630 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2631 std::declval<_Args>()...));
2634 template<typename _Fn, typename _Tp, typename... _Args>
2635 constexpr bool __call_is_nt(__invoke_memfun_deref)
2637 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2638 std::declval<_Args>()...));
2641 template<typename _Fn, typename _Tp>
2642 constexpr bool __call_is_nt(__invoke_memobj_ref)
2644 using _Up = typename __inv_unwrap<_Tp>::type;
2645 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2648 template<typename _Fn, typename _Tp>
2649 constexpr bool __call_is_nt(__invoke_memobj_deref)
2651 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2654 template<typename _Fn, typename... _Args>
2655 constexpr bool __call_is_nt(__invoke_other)
2657 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2660 template<typename _Result, typename _Fn, typename... _Args>
2661 struct __call_is_nothrow
2663 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2667 template<typename _Fn, typename... _Args>
2668 using __call_is_nothrow_
2669 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2671 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2672 template<typename _Fn, typename... _Args>
2673 struct __is_nothrow_invocable
2674 : __and_<__is_invocable<_Fn, _Args...>,
2675 __call_is_nothrow_<_Fn, _Args...>>::type
2679 __nonesuch() = delete;
2680 ~__nonesuch() = delete;
2681 __nonesuch(__nonesuch const&) = delete;
2682 void operator=(__nonesuch const&) = delete;
2685 #if __cplusplus >= 201703L
2686 # define __cpp_lib_is_invocable 201703
2688 /// std::invoke_result
2689 template<typename _Functor, typename... _ArgTypes>
2690 struct invoke_result
2691 : public __invoke_result<_Functor, _ArgTypes...>
2694 /// std::invoke_result_t
2695 template<typename _Fn, typename... _Args>
2696 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2698 /// std::is_invocable
2699 template<typename _Fn, typename... _ArgTypes>
2701 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2704 /// std::is_invocable_r
2705 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2706 struct is_invocable_r
2707 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2710 /// std::is_nothrow_invocable
2711 template<typename _Fn, typename... _ArgTypes>
2712 struct is_nothrow_invocable
2713 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2714 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2717 template<typename _Result, typename _Ret, typename = void>
2718 struct __is_nt_invocable_impl : false_type { };
2720 template<typename _Result, typename _Ret>
2721 struct __is_nt_invocable_impl<_Result, _Ret,
2722 __void_t<typename _Result::type>>
2723 : __or_<is_void<_Ret>,
2724 __and_<is_convertible<typename _Result::type, _Ret>,
2725 is_nothrow_constructible<_Ret, typename _Result::type>>>
2728 /// std::is_nothrow_invocable_r
2729 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2730 struct is_nothrow_invocable_r
2731 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2732 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2735 /// std::is_invocable_v
2736 template<typename _Fn, typename... _Args>
2737 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2739 /// std::is_nothrow_invocable_v
2740 template<typename _Fn, typename... _Args>
2741 inline constexpr bool is_nothrow_invocable_v
2742 = is_nothrow_invocable<_Fn, _Args...>::value;
2744 /// std::is_invocable_r_v
2745 template<typename _Fn, typename... _Args>
2746 inline constexpr bool is_invocable_r_v
2747 = is_invocable_r<_Fn, _Args...>::value;
2749 /// std::is_nothrow_invocable_r_v
2750 template<typename _Fn, typename... _Args>
2751 inline constexpr bool is_nothrow_invocable_r_v
2752 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2755 #if __cplusplus >= 201703L
2756 # define __cpp_lib_type_trait_variable_templates 201510L
2757 template <typename _Tp>
2758 inline constexpr bool is_void_v = is_void<_Tp>::value;
2759 template <typename _Tp>
2760 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2761 template <typename _Tp>
2762 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2763 template <typename _Tp>
2764 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2765 template <typename _Tp>
2766 inline constexpr bool is_array_v = is_array<_Tp>::value;
2767 template <typename _Tp>
2768 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2769 template <typename _Tp>
2770 inline constexpr bool is_lvalue_reference_v =
2771 is_lvalue_reference<_Tp>::value;
2772 template <typename _Tp>
2773 inline constexpr bool is_rvalue_reference_v =
2774 is_rvalue_reference<_Tp>::value;
2775 template <typename _Tp>
2776 inline constexpr bool is_member_object_pointer_v =
2777 is_member_object_pointer<_Tp>::value;
2778 template <typename _Tp>
2779 inline constexpr bool is_member_function_pointer_v =
2780 is_member_function_pointer<_Tp>::value;
2781 template <typename _Tp>
2782 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2783 template <typename _Tp>
2784 inline constexpr bool is_union_v = is_union<_Tp>::value;
2785 template <typename _Tp>
2786 inline constexpr bool is_class_v = is_class<_Tp>::value;
2787 template <typename _Tp>
2788 inline constexpr bool is_function_v = is_function<_Tp>::value;
2789 template <typename _Tp>
2790 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2791 template <typename _Tp>
2792 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2793 template <typename _Tp>
2794 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2795 template <typename _Tp>
2796 inline constexpr bool is_object_v = is_object<_Tp>::value;
2797 template <typename _Tp>
2798 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2799 template <typename _Tp>
2800 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2801 template <typename _Tp>
2802 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2803 template <typename _Tp>
2804 inline constexpr bool is_const_v = is_const<_Tp>::value;
2805 template <typename _Tp>
2806 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2807 template <typename _Tp>
2808 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2809 template <typename _Tp>
2810 inline constexpr bool is_trivially_copyable_v =
2811 is_trivially_copyable<_Tp>::value;
2812 template <typename _Tp>
2813 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2814 template <typename _Tp>
2815 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2816 template <typename _Tp>
2817 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2818 template <typename _Tp>
2819 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2820 template <typename _Tp>
2821 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2822 template <typename _Tp>
2823 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2824 template <typename _Tp>
2825 inline constexpr bool is_final_v = is_final<_Tp>::value;
2826 template <typename _Tp>
2827 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2828 template <typename _Tp>
2829 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2830 template <typename _Tp, typename... _Args>
2831 inline constexpr bool is_constructible_v =
2832 is_constructible<_Tp, _Args...>::value;
2833 template <typename _Tp>
2834 inline constexpr bool is_default_constructible_v =
2835 is_default_constructible<_Tp>::value;
2836 template <typename _Tp>
2837 inline constexpr bool is_copy_constructible_v =
2838 is_copy_constructible<_Tp>::value;
2839 template <typename _Tp>
2840 inline constexpr bool is_move_constructible_v =
2841 is_move_constructible<_Tp>::value;
2842 template <typename _Tp, typename _Up>
2843 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2844 template <typename _Tp>
2845 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2846 template <typename _Tp>
2847 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2848 template <typename _Tp>
2849 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2850 template <typename _Tp, typename... _Args>
2851 inline constexpr bool is_trivially_constructible_v =
2852 is_trivially_constructible<_Tp, _Args...>::value;
2853 template <typename _Tp>
2854 inline constexpr bool is_trivially_default_constructible_v =
2855 is_trivially_default_constructible<_Tp>::value;
2856 template <typename _Tp>
2857 inline constexpr bool is_trivially_copy_constructible_v =
2858 is_trivially_copy_constructible<_Tp>::value;
2859 template <typename _Tp>
2860 inline constexpr bool is_trivially_move_constructible_v =
2861 is_trivially_move_constructible<_Tp>::value;
2862 template <typename _Tp, typename _Up>
2863 inline constexpr bool is_trivially_assignable_v =
2864 is_trivially_assignable<_Tp, _Up>::value;
2865 template <typename _Tp>
2866 inline constexpr bool is_trivially_copy_assignable_v =
2867 is_trivially_copy_assignable<_Tp>::value;
2868 template <typename _Tp>
2869 inline constexpr bool is_trivially_move_assignable_v =
2870 is_trivially_move_assignable<_Tp>::value;
2871 template <typename _Tp>
2872 inline constexpr bool is_trivially_destructible_v =
2873 is_trivially_destructible<_Tp>::value;
2874 template <typename _Tp, typename... _Args>
2875 inline constexpr bool is_nothrow_constructible_v =
2876 is_nothrow_constructible<_Tp, _Args...>::value;
2877 template <typename _Tp>
2878 inline constexpr bool is_nothrow_default_constructible_v =
2879 is_nothrow_default_constructible<_Tp>::value;
2880 template <typename _Tp>
2881 inline constexpr bool is_nothrow_copy_constructible_v =
2882 is_nothrow_copy_constructible<_Tp>::value;
2883 template <typename _Tp>
2884 inline constexpr bool is_nothrow_move_constructible_v =
2885 is_nothrow_move_constructible<_Tp>::value;
2886 template <typename _Tp, typename _Up>
2887 inline constexpr bool is_nothrow_assignable_v =
2888 is_nothrow_assignable<_Tp, _Up>::value;
2889 template <typename _Tp>
2890 inline constexpr bool is_nothrow_copy_assignable_v =
2891 is_nothrow_copy_assignable<_Tp>::value;
2892 template <typename _Tp>
2893 inline constexpr bool is_nothrow_move_assignable_v =
2894 is_nothrow_move_assignable<_Tp>::value;
2895 template <typename _Tp>
2896 inline constexpr bool is_nothrow_destructible_v =
2897 is_nothrow_destructible<_Tp>::value;
2898 template <typename _Tp>
2899 inline constexpr bool has_virtual_destructor_v =
2900 has_virtual_destructor<_Tp>::value;
2901 template <typename _Tp>
2902 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2903 template <typename _Tp>
2904 inline constexpr size_t rank_v = rank<_Tp>::value;
2905 template <typename _Tp, unsigned _Idx = 0>
2906 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2907 template <typename _Tp, typename _Up>
2908 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2909 template <typename _Base, typename _Derived>
2910 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2911 template <typename _From, typename _To>
2912 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
2915 # define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
2916 #elif defined(__is_identifier)
2917 // For non-GNU compilers:
2918 # if ! __is_identifier(__has_unique_object_representations)
2919 # define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
2923 #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2924 # define __cpp_lib_has_unique_object_representations 201606
2925 /// has_unique_object_representations
2926 template<typename _Tp>
2927 struct has_unique_object_representations
2928 : bool_constant<__has_unique_object_representations(
2929 remove_cv_t<remove_all_extents_t<_Tp>>
2933 template<typename _Tp>
2934 inline constexpr bool has_unique_object_representations_v
2935 = has_unique_object_representations<_Tp>::value;
2937 #undef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2940 # define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
2941 #elif defined(__is_identifier)
2942 // For non-GNU compilers:
2943 # if ! __is_identifier(__is_aggregate)
2944 # define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
2948 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
2949 #define __cpp_lib_is_aggregate 201703
2951 template<typename _Tp>
2953 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
2956 template<typename _Tp>
2957 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
2959 #undef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
2963 #if __cplusplus > 201703L
2967 little = __ORDER_LITTLE_ENDIAN__,
2968 big = __ORDER_BIG_ENDIAN__,
2969 native = __BYTE_ORDER__
2973 _GLIBCXX_END_NAMESPACE_VERSION
2978 #endif // _GLIBCXX_TYPE_TRAITS