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 __bool_constant<__is_trivially_constructible(_Tp, _Args...)>
1142 /// is_trivially_default_constructible
1143 template<typename _Tp>
1144 struct is_trivially_default_constructible
1145 : public is_trivially_constructible<_Tp>::type
1148 struct __do_is_implicitly_default_constructible_impl
1150 template <typename _Tp>
1151 static void __helper(const _Tp&);
1153 template <typename _Tp>
1154 static true_type __test(const _Tp&,
1155 decltype(__helper<const _Tp&>({}))* = 0);
1157 static false_type __test(...);
1160 template<typename _Tp>
1161 struct __is_implicitly_default_constructible_impl
1162 : public __do_is_implicitly_default_constructible_impl
1164 typedef decltype(__test(declval<_Tp>())) type;
1167 template<typename _Tp>
1168 struct __is_implicitly_default_constructible_safe
1169 : public __is_implicitly_default_constructible_impl<_Tp>::type
1172 template <typename _Tp>
1173 struct __is_implicitly_default_constructible
1174 : public __and_<is_default_constructible<_Tp>,
1175 __is_implicitly_default_constructible_safe<_Tp>>
1178 /// is_trivially_copy_constructible
1180 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1181 struct __is_trivially_copy_constructible_impl;
1183 template<typename _Tp>
1184 struct __is_trivially_copy_constructible_impl<_Tp, false>
1185 : public false_type { };
1187 template<typename _Tp>
1188 struct __is_trivially_copy_constructible_impl<_Tp, true>
1189 : public __and_<is_copy_constructible<_Tp>,
1190 integral_constant<bool,
1191 __is_trivially_constructible(_Tp, const _Tp&)>>
1194 template<typename _Tp>
1195 struct is_trivially_copy_constructible
1196 : public __is_trivially_copy_constructible_impl<_Tp>
1199 /// is_trivially_move_constructible
1201 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1202 struct __is_trivially_move_constructible_impl;
1204 template<typename _Tp>
1205 struct __is_trivially_move_constructible_impl<_Tp, false>
1206 : public false_type { };
1208 template<typename _Tp>
1209 struct __is_trivially_move_constructible_impl<_Tp, true>
1210 : public __and_<is_move_constructible<_Tp>,
1211 integral_constant<bool,
1212 __is_trivially_constructible(_Tp, _Tp&&)>>
1215 template<typename _Tp>
1216 struct is_trivially_move_constructible
1217 : public __is_trivially_move_constructible_impl<_Tp>
1220 /// is_trivially_assignable
1221 template<typename _Tp, typename _Up>
1222 struct is_trivially_assignable
1223 : public __bool_constant<__is_trivially_assignable(_Tp, _Up)>
1226 /// is_trivially_copy_assignable
1228 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1229 struct __is_trivially_copy_assignable_impl;
1231 template<typename _Tp>
1232 struct __is_trivially_copy_assignable_impl<_Tp, false>
1233 : public false_type { };
1235 template<typename _Tp>
1236 struct __is_trivially_copy_assignable_impl<_Tp, true>
1237 : public __and_<is_copy_assignable<_Tp>,
1238 integral_constant<bool,
1239 __is_trivially_assignable(_Tp&, const _Tp&)>>
1242 template<typename _Tp>
1243 struct is_trivially_copy_assignable
1244 : public __is_trivially_copy_assignable_impl<_Tp>
1247 /// is_trivially_move_assignable
1249 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1250 struct __is_trivially_move_assignable_impl;
1252 template<typename _Tp>
1253 struct __is_trivially_move_assignable_impl<_Tp, false>
1254 : public false_type { };
1256 template<typename _Tp>
1257 struct __is_trivially_move_assignable_impl<_Tp, true>
1258 : public __and_<is_move_assignable<_Tp>,
1259 integral_constant<bool,
1260 __is_trivially_assignable(_Tp&, _Tp&&)>>
1263 template<typename _Tp>
1264 struct is_trivially_move_assignable
1265 : public __is_trivially_move_assignable_impl<_Tp>
1268 /// is_trivially_destructible
1269 template<typename _Tp>
1270 struct is_trivially_destructible
1271 : public __and_<is_destructible<_Tp>, integral_constant<bool,
1272 __has_trivial_destructor(_Tp)>>
1276 /// has_virtual_destructor
1277 template<typename _Tp>
1278 struct has_virtual_destructor
1279 : public integral_constant<bool, __has_virtual_destructor(_Tp)>
1283 // type property queries.
1286 template<typename _Tp>
1288 : public integral_constant<std::size_t, __alignof__(_Tp)> { };
1293 : public integral_constant<std::size_t, 0> { };
1295 template<typename _Tp, std::size_t _Size>
1296 struct rank<_Tp[_Size]>
1297 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1299 template<typename _Tp>
1301 : public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
1304 template<typename, unsigned _Uint>
1306 : public integral_constant<std::size_t, 0> { };
1308 template<typename _Tp, unsigned _Uint, std::size_t _Size>
1309 struct extent<_Tp[_Size], _Uint>
1310 : public integral_constant<std::size_t,
1311 _Uint == 0 ? _Size : extent<_Tp,
1315 template<typename _Tp, unsigned _Uint>
1316 struct extent<_Tp[], _Uint>
1317 : public integral_constant<std::size_t,
1318 _Uint == 0 ? 0 : extent<_Tp,
1326 template<typename, typename>
1328 : public false_type { };
1330 template<typename _Tp>
1331 struct is_same<_Tp, _Tp>
1332 : public true_type { };
1335 template<typename _Base, typename _Derived>
1337 : public integral_constant<bool, __is_base_of(_Base, _Derived)>
1340 template<typename _From, typename _To,
1341 bool = __or_<is_void<_From>, is_function<_To>,
1342 is_array<_To>>::value>
1343 struct __is_convertible_helper
1344 { typedef typename is_void<_To>::type type; };
1346 template<typename _From, typename _To>
1347 class __is_convertible_helper<_From, _To, false>
1349 template<typename _To1>
1350 static void __test_aux(_To1);
1352 template<typename _From1, typename _To1,
1353 typename = decltype(__test_aux<_To1>(std::declval<_From1>()))>
1357 template<typename, typename>
1362 typedef decltype(__test<_From, _To>(0)) type;
1367 template<typename _From, typename _To>
1368 struct is_convertible
1369 : public __is_convertible_helper<_From, _To>::type
1373 // Const-volatile modifications.
1376 template<typename _Tp>
1378 { typedef _Tp type; };
1380 template<typename _Tp>
1381 struct remove_const<_Tp const>
1382 { typedef _Tp type; };
1385 template<typename _Tp>
1386 struct remove_volatile
1387 { typedef _Tp type; };
1389 template<typename _Tp>
1390 struct remove_volatile<_Tp volatile>
1391 { typedef _Tp type; };
1394 template<typename _Tp>
1398 remove_const<typename remove_volatile<_Tp>::type>::type type;
1402 template<typename _Tp>
1404 { typedef _Tp const type; };
1407 template<typename _Tp>
1409 { typedef _Tp volatile type; };
1412 template<typename _Tp>
1416 add_const<typename add_volatile<_Tp>::type>::type type;
1419 #if __cplusplus > 201103L
1421 #define __cpp_lib_transformation_trait_aliases 201304
1423 /// Alias template for remove_const
1424 template<typename _Tp>
1425 using remove_const_t = typename remove_const<_Tp>::type;
1427 /// Alias template for remove_volatile
1428 template<typename _Tp>
1429 using remove_volatile_t = typename remove_volatile<_Tp>::type;
1431 /// Alias template for remove_cv
1432 template<typename _Tp>
1433 using remove_cv_t = typename remove_cv<_Tp>::type;
1435 /// Alias template for add_const
1436 template<typename _Tp>
1437 using add_const_t = typename add_const<_Tp>::type;
1439 /// Alias template for add_volatile
1440 template<typename _Tp>
1441 using add_volatile_t = typename add_volatile<_Tp>::type;
1443 /// Alias template for add_cv
1444 template<typename _Tp>
1445 using add_cv_t = typename add_cv<_Tp>::type;
1448 // Reference transformations.
1450 /// remove_reference
1451 template<typename _Tp>
1452 struct remove_reference
1453 { typedef _Tp type; };
1455 template<typename _Tp>
1456 struct remove_reference<_Tp&>
1457 { typedef _Tp type; };
1459 template<typename _Tp>
1460 struct remove_reference<_Tp&&>
1461 { typedef _Tp type; };
1463 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1464 struct __add_lvalue_reference_helper
1465 { typedef _Tp type; };
1467 template<typename _Tp>
1468 struct __add_lvalue_reference_helper<_Tp, true>
1469 { typedef _Tp& type; };
1471 /// add_lvalue_reference
1472 template<typename _Tp>
1473 struct add_lvalue_reference
1474 : public __add_lvalue_reference_helper<_Tp>
1477 template<typename _Tp, bool = __is_referenceable<_Tp>::value>
1478 struct __add_rvalue_reference_helper
1479 { typedef _Tp type; };
1481 template<typename _Tp>
1482 struct __add_rvalue_reference_helper<_Tp, true>
1483 { typedef _Tp&& type; };
1485 /// add_rvalue_reference
1486 template<typename _Tp>
1487 struct add_rvalue_reference
1488 : public __add_rvalue_reference_helper<_Tp>
1491 #if __cplusplus > 201103L
1492 /// Alias template for remove_reference
1493 template<typename _Tp>
1494 using remove_reference_t = typename remove_reference<_Tp>::type;
1496 /// Alias template for add_lvalue_reference
1497 template<typename _Tp>
1498 using add_lvalue_reference_t = typename add_lvalue_reference<_Tp>::type;
1500 /// Alias template for add_rvalue_reference
1501 template<typename _Tp>
1502 using add_rvalue_reference_t = typename add_rvalue_reference<_Tp>::type;
1505 // Sign modifications.
1507 // Utility for constructing identically cv-qualified types.
1508 template<typename _Unqualified, bool _IsConst, bool _IsVol>
1509 struct __cv_selector;
1511 template<typename _Unqualified>
1512 struct __cv_selector<_Unqualified, false, false>
1513 { typedef _Unqualified __type; };
1515 template<typename _Unqualified>
1516 struct __cv_selector<_Unqualified, false, true>
1517 { typedef volatile _Unqualified __type; };
1519 template<typename _Unqualified>
1520 struct __cv_selector<_Unqualified, true, false>
1521 { typedef const _Unqualified __type; };
1523 template<typename _Unqualified>
1524 struct __cv_selector<_Unqualified, true, true>
1525 { typedef const volatile _Unqualified __type; };
1527 template<typename _Qualified, typename _Unqualified,
1528 bool _IsConst = is_const<_Qualified>::value,
1529 bool _IsVol = is_volatile<_Qualified>::value>
1530 class __match_cv_qualifiers
1532 typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
1535 typedef typename __match::__type __type;
1538 // Utility for finding the unsigned versions of signed integral types.
1539 template<typename _Tp>
1540 struct __make_unsigned
1541 { typedef _Tp __type; };
1544 struct __make_unsigned<char>
1545 { typedef unsigned char __type; };
1548 struct __make_unsigned<signed char>
1549 { typedef unsigned char __type; };
1552 struct __make_unsigned<short>
1553 { typedef unsigned short __type; };
1556 struct __make_unsigned<int>
1557 { typedef unsigned int __type; };
1560 struct __make_unsigned<long>
1561 { typedef unsigned long __type; };
1564 struct __make_unsigned<long long>
1565 { typedef unsigned long long __type; };
1567 #if defined(__GLIBCXX_TYPE_INT_N_0)
1569 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_0>
1570 { typedef unsigned __GLIBCXX_TYPE_INT_N_0 __type; };
1572 #if defined(__GLIBCXX_TYPE_INT_N_1)
1574 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_1>
1575 { typedef unsigned __GLIBCXX_TYPE_INT_N_1 __type; };
1577 #if defined(__GLIBCXX_TYPE_INT_N_2)
1579 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_2>
1580 { typedef unsigned __GLIBCXX_TYPE_INT_N_2 __type; };
1582 #if defined(__GLIBCXX_TYPE_INT_N_3)
1584 struct __make_unsigned<__GLIBCXX_TYPE_INT_N_3>
1585 { typedef unsigned __GLIBCXX_TYPE_INT_N_3 __type; };
1588 // Select between integral and enum: not possible to be both.
1589 template<typename _Tp,
1590 bool _IsInt = is_integral<_Tp>::value,
1591 bool _IsEnum = is_enum<_Tp>::value>
1592 class __make_unsigned_selector;
1594 template<typename _Tp>
1595 class __make_unsigned_selector<_Tp, true, false>
1597 using __unsigned_type
1598 = typename __make_unsigned<typename remove_cv<_Tp>::type>::__type;
1602 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1605 class __make_unsigned_selector_base
1608 template<typename...> struct _List { };
1610 template<typename _Tp, typename... _Up>
1611 struct _List<_Tp, _Up...> : _List<_Up...>
1612 { static constexpr size_t __size = sizeof(_Tp); };
1614 template<size_t _Sz, typename _Tp, bool = (_Sz <= _Tp::__size)>
1617 template<size_t _Sz, typename _Uint, typename... _UInts>
1618 struct __select<_Sz, _List<_Uint, _UInts...>, true>
1619 { using __type = _Uint; };
1621 template<size_t _Sz, typename _Uint, typename... _UInts>
1622 struct __select<_Sz, _List<_Uint, _UInts...>, false>
1623 : __select<_Sz, _List<_UInts...>>
1627 // Choose unsigned integer type with the smallest rank and same size as _Tp
1628 template<typename _Tp>
1629 class __make_unsigned_selector<_Tp, false, true>
1630 : __make_unsigned_selector_base
1632 // With -fshort-enums, an enum may be as small as a char.
1633 using _UInts = _List<unsigned char, unsigned short, unsigned int,
1634 unsigned long, unsigned long long>;
1636 using __unsigned_type = typename __select<sizeof(_Tp), _UInts>::__type;
1640 = typename __match_cv_qualifiers<_Tp, __unsigned_type>::__type;
1643 // wchar_t, char16_t and char32_t are integral types but are neither
1644 // signed integer types nor unsigned integer types, so must be
1645 // transformed to the unsigned integer type with the smallest rank.
1646 // Use the partial specialization for enumeration types to do that.
1647 #if defined(_GLIBCXX_USE_WCHAR_T)
1649 struct __make_unsigned<wchar_t>
1652 = typename __make_unsigned_selector<wchar_t, false, true>::__type;
1657 struct __make_unsigned<char16_t>
1660 = typename __make_unsigned_selector<char16_t, false, true>::__type;
1664 struct __make_unsigned<char32_t>
1667 = typename __make_unsigned_selector<char32_t, false, true>::__type;
1670 // Given an integral/enum type, return the corresponding unsigned
1672 // Primary template.
1674 template<typename _Tp>
1675 struct make_unsigned
1676 { typedef typename __make_unsigned_selector<_Tp>::__type type; };
1678 // Integral, but don't define.
1680 struct make_unsigned<bool>;
1683 // Utility for finding the signed versions of unsigned integral types.
1684 template<typename _Tp>
1685 struct __make_signed
1686 { typedef _Tp __type; };
1689 struct __make_signed<char>
1690 { typedef signed char __type; };
1693 struct __make_signed<unsigned char>
1694 { typedef signed char __type; };
1697 struct __make_signed<unsigned short>
1698 { typedef signed short __type; };
1701 struct __make_signed<unsigned int>
1702 { typedef signed int __type; };
1705 struct __make_signed<unsigned long>
1706 { typedef signed long __type; };
1709 struct __make_signed<unsigned long long>
1710 { typedef signed long long __type; };
1712 #if defined(__GLIBCXX_TYPE_INT_N_0)
1714 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_0>
1715 { typedef __GLIBCXX_TYPE_INT_N_0 __type; };
1717 #if defined(__GLIBCXX_TYPE_INT_N_1)
1719 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_1>
1720 { typedef __GLIBCXX_TYPE_INT_N_1 __type; };
1722 #if defined(__GLIBCXX_TYPE_INT_N_2)
1724 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_2>
1725 { typedef __GLIBCXX_TYPE_INT_N_2 __type; };
1727 #if defined(__GLIBCXX_TYPE_INT_N_3)
1729 struct __make_signed<unsigned __GLIBCXX_TYPE_INT_N_3>
1730 { typedef __GLIBCXX_TYPE_INT_N_3 __type; };
1733 // Select between integral and enum: not possible to be both.
1734 template<typename _Tp,
1735 bool _IsInt = is_integral<_Tp>::value,
1736 bool _IsEnum = is_enum<_Tp>::value>
1737 class __make_signed_selector;
1739 template<typename _Tp>
1740 class __make_signed_selector<_Tp, true, false>
1743 = typename __make_signed<typename remove_cv<_Tp>::type>::__type;
1747 = typename __match_cv_qualifiers<_Tp, __signed_type>::__type;
1750 // Choose signed integer type with the smallest rank and same size as _Tp
1751 template<typename _Tp>
1752 class __make_signed_selector<_Tp, false, true>
1754 typedef typename __make_unsigned_selector<_Tp>::__type __unsigned_type;
1757 typedef typename __make_signed_selector<__unsigned_type>::__type __type;
1760 // wchar_t, char16_t and char32_t are integral types but are neither
1761 // signed integer types nor unsigned integer types, so must be
1762 // transformed to the signed integer type with the smallest rank.
1763 // Use the partial specialization for enumeration types to do that.
1764 #if defined(_GLIBCXX_USE_WCHAR_T)
1766 struct __make_signed<wchar_t>
1769 = typename __make_signed_selector<wchar_t, false, true>::__type;
1774 struct __make_signed<char16_t>
1777 = typename __make_signed_selector<char16_t, false, true>::__type;
1781 struct __make_signed<char32_t>
1784 = typename __make_signed_selector<char32_t, false, true>::__type;
1787 // Given an integral/enum type, return the corresponding signed
1789 // Primary template.
1791 template<typename _Tp>
1793 { typedef typename __make_signed_selector<_Tp>::__type type; };
1795 // Integral, but don't define.
1797 struct make_signed<bool>;
1799 #if __cplusplus > 201103L
1800 /// Alias template for make_signed
1801 template<typename _Tp>
1802 using make_signed_t = typename make_signed<_Tp>::type;
1804 /// Alias template for make_unsigned
1805 template<typename _Tp>
1806 using make_unsigned_t = typename make_unsigned<_Tp>::type;
1809 // Array modifications.
1812 template<typename _Tp>
1813 struct remove_extent
1814 { typedef _Tp type; };
1816 template<typename _Tp, std::size_t _Size>
1817 struct remove_extent<_Tp[_Size]>
1818 { typedef _Tp type; };
1820 template<typename _Tp>
1821 struct remove_extent<_Tp[]>
1822 { typedef _Tp type; };
1824 /// remove_all_extents
1825 template<typename _Tp>
1826 struct remove_all_extents
1827 { typedef _Tp type; };
1829 template<typename _Tp, std::size_t _Size>
1830 struct remove_all_extents<_Tp[_Size]>
1831 { typedef typename remove_all_extents<_Tp>::type type; };
1833 template<typename _Tp>
1834 struct remove_all_extents<_Tp[]>
1835 { typedef typename remove_all_extents<_Tp>::type type; };
1837 #if __cplusplus > 201103L
1838 /// Alias template for remove_extent
1839 template<typename _Tp>
1840 using remove_extent_t = typename remove_extent<_Tp>::type;
1842 /// Alias template for remove_all_extents
1843 template<typename _Tp>
1844 using remove_all_extents_t = typename remove_all_extents<_Tp>::type;
1847 // Pointer modifications.
1849 template<typename _Tp, typename>
1850 struct __remove_pointer_helper
1851 { typedef _Tp type; };
1853 template<typename _Tp, typename _Up>
1854 struct __remove_pointer_helper<_Tp, _Up*>
1855 { typedef _Up type; };
1858 template<typename _Tp>
1859 struct remove_pointer
1860 : public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
1864 template<typename _Tp, bool = __or_<__is_referenceable<_Tp>,
1865 is_void<_Tp>>::value>
1866 struct __add_pointer_helper
1867 { typedef _Tp type; };
1869 template<typename _Tp>
1870 struct __add_pointer_helper<_Tp, true>
1871 { typedef typename remove_reference<_Tp>::type* type; };
1873 template<typename _Tp>
1875 : public __add_pointer_helper<_Tp>
1878 #if __cplusplus > 201103L
1879 /// Alias template for remove_pointer
1880 template<typename _Tp>
1881 using remove_pointer_t = typename remove_pointer<_Tp>::type;
1883 /// Alias template for add_pointer
1884 template<typename _Tp>
1885 using add_pointer_t = typename add_pointer<_Tp>::type;
1888 template<std::size_t _Len>
1889 struct __aligned_storage_msa
1893 unsigned char __data[_Len];
1894 struct __attribute__((__aligned__)) { } __align;
1899 * @brief Alignment type.
1901 * The value of _Align is a default-alignment which shall be the
1902 * most stringent alignment requirement for any C++ object type
1903 * whose size is no greater than _Len (3.9). The member typedef
1904 * type shall be a POD type suitable for use as uninitialized
1905 * storage for any object whose size is at most _Len and whose
1906 * alignment is a divisor of _Align.
1908 template<std::size_t _Len, std::size_t _Align =
1909 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
1910 struct aligned_storage
1914 unsigned char __data[_Len];
1915 struct __attribute__((__aligned__((_Align)))) { } __align;
1919 template <typename... _Types>
1920 struct __strictest_alignment
1922 static const size_t _S_alignment = 0;
1923 static const size_t _S_size = 0;
1926 template <typename _Tp, typename... _Types>
1927 struct __strictest_alignment<_Tp, _Types...>
1929 static const size_t _S_alignment =
1930 alignof(_Tp) > __strictest_alignment<_Types...>::_S_alignment
1931 ? alignof(_Tp) : __strictest_alignment<_Types...>::_S_alignment;
1932 static const size_t _S_size =
1933 sizeof(_Tp) > __strictest_alignment<_Types...>::_S_size
1934 ? sizeof(_Tp) : __strictest_alignment<_Types...>::_S_size;
1938 * @brief Provide aligned storage for types.
1940 * [meta.trans.other]
1942 * Provides aligned storage for any of the provided types of at
1945 * @see aligned_storage
1947 template <size_t _Len, typename... _Types>
1948 struct aligned_union
1951 static_assert(sizeof...(_Types) != 0, "At least one type is required");
1953 using __strictest = __strictest_alignment<_Types...>;
1954 static const size_t _S_len = _Len > __strictest::_S_size
1955 ? _Len : __strictest::_S_size;
1957 /// The value of the strictest alignment of _Types.
1958 static const size_t alignment_value = __strictest::_S_alignment;
1960 typedef typename aligned_storage<_S_len, alignment_value>::type type;
1963 template <size_t _Len, typename... _Types>
1964 const size_t aligned_union<_Len, _Types...>::alignment_value;
1966 // Decay trait for arrays and functions, used for perfect forwarding
1967 // in make_pair, make_tuple, etc.
1968 template<typename _Up,
1969 bool _IsArray = is_array<_Up>::value,
1970 bool _IsFunction = is_function<_Up>::value>
1971 struct __decay_selector;
1974 template<typename _Up>
1975 struct __decay_selector<_Up, false, false>
1976 { typedef typename remove_cv<_Up>::type __type; };
1978 template<typename _Up>
1979 struct __decay_selector<_Up, true, false>
1980 { typedef typename remove_extent<_Up>::type* __type; };
1982 template<typename _Up>
1983 struct __decay_selector<_Up, false, true>
1984 { typedef typename add_pointer<_Up>::type __type; };
1987 template<typename _Tp>
1990 typedef typename remove_reference<_Tp>::type __remove_type;
1993 typedef typename __decay_selector<__remove_type>::__type type;
1996 template<typename _Tp>
1997 class reference_wrapper;
1999 // Helper which adds a reference to a type when given a reference_wrapper
2000 template<typename _Tp>
2001 struct __strip_reference_wrapper
2006 template<typename _Tp>
2007 struct __strip_reference_wrapper<reference_wrapper<_Tp> >
2009 typedef _Tp& __type;
2012 template<typename _Tp>
2013 struct __decay_and_strip
2015 typedef typename __strip_reference_wrapper<
2016 typename decay<_Tp>::type>::__type __type;
2020 // Primary template.
2021 /// Define a member typedef @c type only if a boolean constant is true.
2022 template<bool, typename _Tp = void>
2026 // Partial specialization for true.
2027 template<typename _Tp>
2028 struct enable_if<true, _Tp>
2029 { typedef _Tp type; };
2031 template<typename... _Cond>
2032 using _Require = typename enable_if<__and_<_Cond...>::value>::type;
2034 // Primary template.
2035 /// Define a member typedef @c type to one of two argument types.
2036 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2038 { typedef _Iftrue type; };
2040 // Partial specialization for false.
2041 template<typename _Iftrue, typename _Iffalse>
2042 struct conditional<false, _Iftrue, _Iffalse>
2043 { typedef _Iffalse type; };
2046 template<typename... _Tp>
2049 // Sfinae-friendly common_type implementation:
2051 struct __do_common_type_impl
2053 template<typename _Tp, typename _Up>
2054 static __success_type<typename decay<decltype
2055 (true ? std::declval<_Tp>()
2056 : std::declval<_Up>())>::type> _S_test(int);
2058 template<typename, typename>
2059 static __failure_type _S_test(...);
2062 template<typename _Tp, typename _Up>
2063 struct __common_type_impl
2064 : private __do_common_type_impl
2066 typedef decltype(_S_test<_Tp, _Up>(0)) type;
2069 struct __do_member_type_wrapper
2071 template<typename _Tp>
2072 static __success_type<typename _Tp::type> _S_test(int);
2075 static __failure_type _S_test(...);
2078 template<typename _Tp>
2079 struct __member_type_wrapper
2080 : private __do_member_type_wrapper
2082 typedef decltype(_S_test<_Tp>(0)) type;
2085 template<typename _CTp, typename... _Args>
2086 struct __expanded_common_type_wrapper
2088 typedef common_type<typename _CTp::type, _Args...> type;
2091 template<typename... _Args>
2092 struct __expanded_common_type_wrapper<__failure_type, _Args...>
2093 { typedef __failure_type type; };
2095 template<typename _Tp>
2096 struct common_type<_Tp>
2097 { typedef typename decay<_Tp>::type type; };
2099 template<typename _Tp, typename _Up>
2100 struct common_type<_Tp, _Up>
2101 : public __common_type_impl<_Tp, _Up>::type
2104 template<typename _Tp, typename _Up, typename... _Vp>
2105 struct common_type<_Tp, _Up, _Vp...>
2106 : public __expanded_common_type_wrapper<typename __member_type_wrapper<
2107 common_type<_Tp, _Up>>::type, _Vp...>::type
2110 /// The underlying type of an enum.
2111 template<typename _Tp>
2112 struct underlying_type
2114 typedef __underlying_type(_Tp) type;
2117 template<typename _Tp>
2118 struct __declval_protector
2120 static const bool __stop = false;
2123 template<typename _Tp>
2124 auto declval() noexcept -> decltype(__declval<_Tp>(0))
2126 static_assert(__declval_protector<_Tp>::__stop,
2127 "declval() must not be used!");
2128 return __declval<_Tp>(0);
2131 // __remove_cvref_t (std::remove_cvref_t for C++11).
2132 template<typename _Tp>
2133 using __remove_cvref_t
2134 = typename remove_cv<typename remove_reference<_Tp>::type>::type;
2137 template<typename _Signature>
2140 // Sfinae-friendly result_of implementation:
2142 #define __cpp_lib_result_of_sfinae 201210
2144 struct __invoke_memfun_ref { };
2145 struct __invoke_memfun_deref { };
2146 struct __invoke_memobj_ref { };
2147 struct __invoke_memobj_deref { };
2148 struct __invoke_other { };
2150 // Associate a tag type with a specialization of __success_type.
2151 template<typename _Tp, typename _Tag>
2152 struct __result_of_success : __success_type<_Tp>
2153 { using __invoke_type = _Tag; };
2155 // [func.require] paragraph 1 bullet 1:
2156 struct __result_of_memfun_ref_impl
2158 template<typename _Fp, typename _Tp1, typename... _Args>
2159 static __result_of_success<decltype(
2160 (std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...)
2161 ), __invoke_memfun_ref> _S_test(int);
2163 template<typename...>
2164 static __failure_type _S_test(...);
2167 template<typename _MemPtr, typename _Arg, typename... _Args>
2168 struct __result_of_memfun_ref
2169 : private __result_of_memfun_ref_impl
2171 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2174 // [func.require] paragraph 1 bullet 2:
2175 struct __result_of_memfun_deref_impl
2177 template<typename _Fp, typename _Tp1, typename... _Args>
2178 static __result_of_success<decltype(
2179 ((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...)
2180 ), __invoke_memfun_deref> _S_test(int);
2182 template<typename...>
2183 static __failure_type _S_test(...);
2186 template<typename _MemPtr, typename _Arg, typename... _Args>
2187 struct __result_of_memfun_deref
2188 : private __result_of_memfun_deref_impl
2190 typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type;
2193 // [func.require] paragraph 1 bullet 3:
2194 struct __result_of_memobj_ref_impl
2196 template<typename _Fp, typename _Tp1>
2197 static __result_of_success<decltype(
2198 std::declval<_Tp1>().*std::declval<_Fp>()
2199 ), __invoke_memobj_ref> _S_test(int);
2201 template<typename, typename>
2202 static __failure_type _S_test(...);
2205 template<typename _MemPtr, typename _Arg>
2206 struct __result_of_memobj_ref
2207 : private __result_of_memobj_ref_impl
2209 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2212 // [func.require] paragraph 1 bullet 4:
2213 struct __result_of_memobj_deref_impl
2215 template<typename _Fp, typename _Tp1>
2216 static __result_of_success<decltype(
2217 (*std::declval<_Tp1>()).*std::declval<_Fp>()
2218 ), __invoke_memobj_deref> _S_test(int);
2220 template<typename, typename>
2221 static __failure_type _S_test(...);
2224 template<typename _MemPtr, typename _Arg>
2225 struct __result_of_memobj_deref
2226 : private __result_of_memobj_deref_impl
2228 typedef decltype(_S_test<_MemPtr, _Arg>(0)) type;
2231 template<typename _MemPtr, typename _Arg>
2232 struct __result_of_memobj;
2234 template<typename _Res, typename _Class, typename _Arg>
2235 struct __result_of_memobj<_Res _Class::*, _Arg>
2237 typedef __remove_cvref_t<_Arg> _Argval;
2238 typedef _Res _Class::* _MemPtr;
2239 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2240 is_base_of<_Class, _Argval>>::value,
2241 __result_of_memobj_ref<_MemPtr, _Arg>,
2242 __result_of_memobj_deref<_MemPtr, _Arg>
2246 template<typename _MemPtr, typename _Arg, typename... _Args>
2247 struct __result_of_memfun;
2249 template<typename _Res, typename _Class, typename _Arg, typename... _Args>
2250 struct __result_of_memfun<_Res _Class::*, _Arg, _Args...>
2252 typedef __remove_cvref_t<_Arg> _Argval;
2253 typedef _Res _Class::* _MemPtr;
2254 typedef typename conditional<__or_<is_same<_Argval, _Class>,
2255 is_base_of<_Class, _Argval>>::value,
2256 __result_of_memfun_ref<_MemPtr, _Arg, _Args...>,
2257 __result_of_memfun_deref<_MemPtr, _Arg, _Args...>
2261 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2262 // 2219. INVOKE-ing a pointer to member with a reference_wrapper
2263 // as the object expression
2265 // Used by result_of, invoke etc. to unwrap a reference_wrapper.
2266 template<typename _Tp, typename _Up = typename decay<_Tp>::type>
2272 template<typename _Tp, typename _Up>
2273 struct __inv_unwrap<_Tp, reference_wrapper<_Up>>
2278 template<bool, bool, typename _Functor, typename... _ArgTypes>
2279 struct __result_of_impl
2281 typedef __failure_type type;
2284 template<typename _MemPtr, typename _Arg>
2285 struct __result_of_impl<true, false, _MemPtr, _Arg>
2286 : public __result_of_memobj<typename decay<_MemPtr>::type,
2287 typename __inv_unwrap<_Arg>::type>
2290 template<typename _MemPtr, typename _Arg, typename... _Args>
2291 struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...>
2292 : public __result_of_memfun<typename decay<_MemPtr>::type,
2293 typename __inv_unwrap<_Arg>::type, _Args...>
2296 // [func.require] paragraph 1 bullet 5:
2297 struct __result_of_other_impl
2299 template<typename _Fn, typename... _Args>
2300 static __result_of_success<decltype(
2301 std::declval<_Fn>()(std::declval<_Args>()...)
2302 ), __invoke_other> _S_test(int);
2304 template<typename...>
2305 static __failure_type _S_test(...);
2308 template<typename _Functor, typename... _ArgTypes>
2309 struct __result_of_impl<false, false, _Functor, _ArgTypes...>
2310 : private __result_of_other_impl
2312 typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type;
2315 // __invoke_result (std::invoke_result for C++11)
2316 template<typename _Functor, typename... _ArgTypes>
2317 struct __invoke_result
2318 : public __result_of_impl<
2319 is_member_object_pointer<
2320 typename remove_reference<_Functor>::type
2322 is_member_function_pointer<
2323 typename remove_reference<_Functor>::type
2325 _Functor, _ArgTypes...
2329 template<typename _Functor, typename... _ArgTypes>
2330 struct result_of<_Functor(_ArgTypes...)>
2331 : public __invoke_result<_Functor, _ArgTypes...>
2334 #if __cplusplus >= 201402L
2335 /// Alias template for aligned_storage
2336 template<size_t _Len, size_t _Align =
2337 __alignof__(typename __aligned_storage_msa<_Len>::__type)>
2338 using aligned_storage_t = typename aligned_storage<_Len, _Align>::type;
2340 template <size_t _Len, typename... _Types>
2341 using aligned_union_t = typename aligned_union<_Len, _Types...>::type;
2343 /// Alias template for decay
2344 template<typename _Tp>
2345 using decay_t = typename decay<_Tp>::type;
2347 /// Alias template for enable_if
2348 template<bool _Cond, typename _Tp = void>
2349 using enable_if_t = typename enable_if<_Cond, _Tp>::type;
2351 /// Alias template for conditional
2352 template<bool _Cond, typename _Iftrue, typename _Iffalse>
2353 using conditional_t = typename conditional<_Cond, _Iftrue, _Iffalse>::type;
2355 /// Alias template for common_type
2356 template<typename... _Tp>
2357 using common_type_t = typename common_type<_Tp...>::type;
2359 /// Alias template for underlying_type
2360 template<typename _Tp>
2361 using underlying_type_t = typename underlying_type<_Tp>::type;
2363 /// Alias template for result_of
2364 template<typename _Tp>
2365 using result_of_t = typename result_of<_Tp>::type;
2368 // __enable_if_t (std::enable_if_t for C++11)
2369 template<bool _Cond, typename _Tp = void>
2370 using __enable_if_t = typename enable_if<_Cond, _Tp>::type;
2372 // __void_t (std::void_t for C++11)
2373 template<typename...> using __void_t = void;
2375 #if __cplusplus >= 201703L || !defined(__STRICT_ANSI__) // c++17 or gnu++11
2376 #define __cpp_lib_void_t 201411
2377 /// A metafunction that always yields void, used for detecting valid types.
2378 template<typename...> using void_t = void;
2381 /// Implementation of the detection idiom (negative case).
2382 template<typename _Default, typename _AlwaysVoid,
2383 template<typename...> class _Op, typename... _Args>
2386 using value_t = false_type;
2387 using type = _Default;
2390 /// Implementation of the detection idiom (positive case).
2391 template<typename _Default, template<typename...> class _Op,
2393 struct __detector<_Default, __void_t<_Op<_Args...>>, _Op, _Args...>
2395 using value_t = true_type;
2396 using type = _Op<_Args...>;
2399 // Detect whether _Op<_Args...> is a valid type, use _Default if not.
2400 template<typename _Default, template<typename...> class _Op,
2402 using __detected_or = __detector<_Default, void, _Op, _Args...>;
2404 // _Op<_Args...> if that is a valid type, otherwise _Default.
2405 template<typename _Default, template<typename...> class _Op,
2407 using __detected_or_t
2408 = typename __detected_or<_Default, _Op, _Args...>::type;
2410 /// @} group metaprogramming
2413 * Use SFINAE to determine if the type _Tp has a publicly-accessible
2414 * member type _NTYPE.
2416 #define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
2417 template<typename _Tp, typename = __void_t<>> \
2418 struct __has_##_NTYPE \
2421 template<typename _Tp> \
2422 struct __has_##_NTYPE<_Tp, __void_t<typename _Tp::_NTYPE>> \
2426 template <typename _Tp>
2427 struct __is_swappable;
2429 template <typename _Tp>
2430 struct __is_nothrow_swappable;
2432 template<typename... _Elements>
2436 struct __is_tuple_like_impl : false_type
2439 template<typename... _Tps>
2440 struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
2443 // Internal type trait that allows us to sfinae-protect tuple_cat.
2444 template<typename _Tp>
2445 struct __is_tuple_like
2446 : public __is_tuple_like_impl<__remove_cvref_t<_Tp>>::type
2449 template<typename _Tp>
2451 typename enable_if<__and_<__not_<__is_tuple_like<_Tp>>,
2452 is_move_constructible<_Tp>,
2453 is_move_assignable<_Tp>>::value>::type
2455 noexcept(__and_<is_nothrow_move_constructible<_Tp>,
2456 is_nothrow_move_assignable<_Tp>>::value);
2458 template<typename _Tp, size_t _Nm>
2460 typename enable_if<__is_swappable<_Tp>::value>::type
2461 swap(_Tp (&__a)[_Nm], _Tp (&__b)[_Nm])
2462 noexcept(__is_nothrow_swappable<_Tp>::value);
2464 namespace __swappable_details {
2467 struct __do_is_swappable_impl
2469 template<typename _Tp, typename
2470 = decltype(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))>
2471 static true_type __test(int);
2474 static false_type __test(...);
2477 struct __do_is_nothrow_swappable_impl
2479 template<typename _Tp>
2480 static __bool_constant<
2481 noexcept(swap(std::declval<_Tp&>(), std::declval<_Tp&>()))
2485 static false_type __test(...);
2488 } // namespace __swappable_details
2490 template<typename _Tp>
2491 struct __is_swappable_impl
2492 : public __swappable_details::__do_is_swappable_impl
2494 typedef decltype(__test<_Tp>(0)) type;
2497 template<typename _Tp>
2498 struct __is_nothrow_swappable_impl
2499 : public __swappable_details::__do_is_nothrow_swappable_impl
2501 typedef decltype(__test<_Tp>(0)) type;
2504 template<typename _Tp>
2505 struct __is_swappable
2506 : public __is_swappable_impl<_Tp>::type
2509 template<typename _Tp>
2510 struct __is_nothrow_swappable
2511 : public __is_nothrow_swappable_impl<_Tp>::type
2514 #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
2515 #define __cpp_lib_is_swappable 201603
2516 /// Metafunctions used for detecting swappable types: p0185r1
2519 template<typename _Tp>
2521 : public __is_swappable_impl<_Tp>::type
2524 /// is_nothrow_swappable
2525 template<typename _Tp>
2526 struct is_nothrow_swappable
2527 : public __is_nothrow_swappable_impl<_Tp>::type
2530 #if __cplusplus >= 201402L
2532 template<typename _Tp>
2533 _GLIBCXX17_INLINE constexpr bool is_swappable_v =
2534 is_swappable<_Tp>::value;
2536 /// is_nothrow_swappable_v
2537 template<typename _Tp>
2538 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_v =
2539 is_nothrow_swappable<_Tp>::value;
2540 #endif // __cplusplus >= 201402L
2542 namespace __swappable_with_details {
2545 struct __do_is_swappable_with_impl
2547 template<typename _Tp, typename _Up, typename
2548 = decltype(swap(std::declval<_Tp>(), std::declval<_Up>())),
2550 = decltype(swap(std::declval<_Up>(), std::declval<_Tp>()))>
2551 static true_type __test(int);
2553 template<typename, typename>
2554 static false_type __test(...);
2557 struct __do_is_nothrow_swappable_with_impl
2559 template<typename _Tp, typename _Up>
2560 static __bool_constant<
2561 noexcept(swap(std::declval<_Tp>(), std::declval<_Up>()))
2563 noexcept(swap(std::declval<_Up>(), std::declval<_Tp>()))
2566 template<typename, typename>
2567 static false_type __test(...);
2570 } // namespace __swappable_with_details
2572 template<typename _Tp, typename _Up>
2573 struct __is_swappable_with_impl
2574 : public __swappable_with_details::__do_is_swappable_with_impl
2576 typedef decltype(__test<_Tp, _Up>(0)) type;
2579 // Optimization for the homogenous lvalue case, not required:
2580 template<typename _Tp>
2581 struct __is_swappable_with_impl<_Tp&, _Tp&>
2582 : public __swappable_details::__do_is_swappable_impl
2584 typedef decltype(__test<_Tp&>(0)) type;
2587 template<typename _Tp, typename _Up>
2588 struct __is_nothrow_swappable_with_impl
2589 : public __swappable_with_details::__do_is_nothrow_swappable_with_impl
2591 typedef decltype(__test<_Tp, _Up>(0)) type;
2594 // Optimization for the homogenous lvalue case, not required:
2595 template<typename _Tp>
2596 struct __is_nothrow_swappable_with_impl<_Tp&, _Tp&>
2597 : public __swappable_details::__do_is_nothrow_swappable_impl
2599 typedef decltype(__test<_Tp&>(0)) type;
2602 /// is_swappable_with
2603 template<typename _Tp, typename _Up>
2604 struct is_swappable_with
2605 : public __is_swappable_with_impl<_Tp, _Up>::type
2608 /// is_nothrow_swappable_with
2609 template<typename _Tp, typename _Up>
2610 struct is_nothrow_swappable_with
2611 : public __is_nothrow_swappable_with_impl<_Tp, _Up>::type
2614 #if __cplusplus >= 201402L
2615 /// is_swappable_with_v
2616 template<typename _Tp, typename _Up>
2617 _GLIBCXX17_INLINE constexpr bool is_swappable_with_v =
2618 is_swappable_with<_Tp, _Up>::value;
2620 /// is_nothrow_swappable_with_v
2621 template<typename _Tp, typename _Up>
2622 _GLIBCXX17_INLINE constexpr bool is_nothrow_swappable_with_v =
2623 is_nothrow_swappable_with<_Tp, _Up>::value;
2624 #endif // __cplusplus >= 201402L
2626 #endif// c++1z or gnu++11
2628 // __is_invocable (std::is_invocable for C++11)
2630 template<typename _Result, typename _Ret, typename = void>
2631 struct __is_invocable_impl : false_type { };
2633 template<typename _Result, typename _Ret>
2634 struct __is_invocable_impl<_Result, _Ret, __void_t<typename _Result::type>>
2635 : __or_<is_void<_Ret>, is_convertible<typename _Result::type, _Ret>>::type
2638 template<typename _Fn, typename... _ArgTypes>
2639 struct __is_invocable
2640 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2643 template<typename _Fn, typename _Tp, typename... _Args>
2644 constexpr bool __call_is_nt(__invoke_memfun_ref)
2646 using _Up = typename __inv_unwrap<_Tp>::type;
2647 return noexcept((std::declval<_Up>().*std::declval<_Fn>())(
2648 std::declval<_Args>()...));
2651 template<typename _Fn, typename _Tp, typename... _Args>
2652 constexpr bool __call_is_nt(__invoke_memfun_deref)
2654 return noexcept(((*std::declval<_Tp>()).*std::declval<_Fn>())(
2655 std::declval<_Args>()...));
2658 template<typename _Fn, typename _Tp>
2659 constexpr bool __call_is_nt(__invoke_memobj_ref)
2661 using _Up = typename __inv_unwrap<_Tp>::type;
2662 return noexcept(std::declval<_Up>().*std::declval<_Fn>());
2665 template<typename _Fn, typename _Tp>
2666 constexpr bool __call_is_nt(__invoke_memobj_deref)
2668 return noexcept((*std::declval<_Tp>()).*std::declval<_Fn>());
2671 template<typename _Fn, typename... _Args>
2672 constexpr bool __call_is_nt(__invoke_other)
2674 return noexcept(std::declval<_Fn>()(std::declval<_Args>()...));
2677 template<typename _Result, typename _Fn, typename... _Args>
2678 struct __call_is_nothrow
2680 std::__call_is_nt<_Fn, _Args...>(typename _Result::__invoke_type{})
2684 template<typename _Fn, typename... _Args>
2685 using __call_is_nothrow_
2686 = __call_is_nothrow<__invoke_result<_Fn, _Args...>, _Fn, _Args...>;
2688 // __is_nothrow_invocable (std::is_nothrow_invocable for C++11)
2689 template<typename _Fn, typename... _Args>
2690 struct __is_nothrow_invocable
2691 : __and_<__is_invocable<_Fn, _Args...>,
2692 __call_is_nothrow_<_Fn, _Args...>>::type
2696 __nonesuch() = delete;
2697 ~__nonesuch() = delete;
2698 __nonesuch(__nonesuch const&) = delete;
2699 void operator=(__nonesuch const&) = delete;
2702 #if __cplusplus >= 201703L
2703 # define __cpp_lib_is_invocable 201703
2705 /// std::invoke_result
2706 template<typename _Functor, typename... _ArgTypes>
2707 struct invoke_result
2708 : public __invoke_result<_Functor, _ArgTypes...>
2711 /// std::invoke_result_t
2712 template<typename _Fn, typename... _Args>
2713 using invoke_result_t = typename invoke_result<_Fn, _Args...>::type;
2715 /// std::is_invocable
2716 template<typename _Fn, typename... _ArgTypes>
2718 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>::type
2721 /// std::is_invocable_r
2722 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2723 struct is_invocable_r
2724 : __is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>::type
2727 /// std::is_nothrow_invocable
2728 template<typename _Fn, typename... _ArgTypes>
2729 struct is_nothrow_invocable
2730 : __and_<__is_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, void>,
2731 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2734 template<typename _Result, typename _Ret, typename = void>
2735 struct __is_nt_invocable_impl : false_type { };
2737 template<typename _Result, typename _Ret>
2738 struct __is_nt_invocable_impl<_Result, _Ret,
2739 __void_t<typename _Result::type>>
2740 : __or_<is_void<_Ret>,
2741 __and_<is_convertible<typename _Result::type, _Ret>,
2742 is_nothrow_constructible<_Ret, typename _Result::type>>>
2745 /// std::is_nothrow_invocable_r
2746 template<typename _Ret, typename _Fn, typename... _ArgTypes>
2747 struct is_nothrow_invocable_r
2748 : __and_<__is_nt_invocable_impl<__invoke_result<_Fn, _ArgTypes...>, _Ret>,
2749 __call_is_nothrow_<_Fn, _ArgTypes...>>::type
2752 /// std::is_invocable_v
2753 template<typename _Fn, typename... _Args>
2754 inline constexpr bool is_invocable_v = is_invocable<_Fn, _Args...>::value;
2756 /// std::is_nothrow_invocable_v
2757 template<typename _Fn, typename... _Args>
2758 inline constexpr bool is_nothrow_invocable_v
2759 = is_nothrow_invocable<_Fn, _Args...>::value;
2761 /// std::is_invocable_r_v
2762 template<typename _Fn, typename... _Args>
2763 inline constexpr bool is_invocable_r_v
2764 = is_invocable_r<_Fn, _Args...>::value;
2766 /// std::is_nothrow_invocable_r_v
2767 template<typename _Fn, typename... _Args>
2768 inline constexpr bool is_nothrow_invocable_r_v
2769 = is_nothrow_invocable_r<_Fn, _Args...>::value;
2772 #if __cplusplus >= 201703L
2773 # define __cpp_lib_type_trait_variable_templates 201510L
2774 template <typename _Tp>
2775 inline constexpr bool is_void_v = is_void<_Tp>::value;
2776 template <typename _Tp>
2777 inline constexpr bool is_null_pointer_v = is_null_pointer<_Tp>::value;
2778 template <typename _Tp>
2779 inline constexpr bool is_integral_v = is_integral<_Tp>::value;
2780 template <typename _Tp>
2781 inline constexpr bool is_floating_point_v = is_floating_point<_Tp>::value;
2782 template <typename _Tp>
2783 inline constexpr bool is_array_v = is_array<_Tp>::value;
2784 template <typename _Tp>
2785 inline constexpr bool is_pointer_v = is_pointer<_Tp>::value;
2786 template <typename _Tp>
2787 inline constexpr bool is_lvalue_reference_v =
2788 is_lvalue_reference<_Tp>::value;
2789 template <typename _Tp>
2790 inline constexpr bool is_rvalue_reference_v =
2791 is_rvalue_reference<_Tp>::value;
2792 template <typename _Tp>
2793 inline constexpr bool is_member_object_pointer_v =
2794 is_member_object_pointer<_Tp>::value;
2795 template <typename _Tp>
2796 inline constexpr bool is_member_function_pointer_v =
2797 is_member_function_pointer<_Tp>::value;
2798 template <typename _Tp>
2799 inline constexpr bool is_enum_v = is_enum<_Tp>::value;
2800 template <typename _Tp>
2801 inline constexpr bool is_union_v = is_union<_Tp>::value;
2802 template <typename _Tp>
2803 inline constexpr bool is_class_v = is_class<_Tp>::value;
2804 template <typename _Tp>
2805 inline constexpr bool is_function_v = is_function<_Tp>::value;
2806 template <typename _Tp>
2807 inline constexpr bool is_reference_v = is_reference<_Tp>::value;
2808 template <typename _Tp>
2809 inline constexpr bool is_arithmetic_v = is_arithmetic<_Tp>::value;
2810 template <typename _Tp>
2811 inline constexpr bool is_fundamental_v = is_fundamental<_Tp>::value;
2812 template <typename _Tp>
2813 inline constexpr bool is_object_v = is_object<_Tp>::value;
2814 template <typename _Tp>
2815 inline constexpr bool is_scalar_v = is_scalar<_Tp>::value;
2816 template <typename _Tp>
2817 inline constexpr bool is_compound_v = is_compound<_Tp>::value;
2818 template <typename _Tp>
2819 inline constexpr bool is_member_pointer_v = is_member_pointer<_Tp>::value;
2820 template <typename _Tp>
2821 inline constexpr bool is_const_v = is_const<_Tp>::value;
2822 template <typename _Tp>
2823 inline constexpr bool is_volatile_v = is_volatile<_Tp>::value;
2824 template <typename _Tp>
2825 inline constexpr bool is_trivial_v = is_trivial<_Tp>::value;
2826 template <typename _Tp>
2827 inline constexpr bool is_trivially_copyable_v =
2828 is_trivially_copyable<_Tp>::value;
2829 template <typename _Tp>
2830 inline constexpr bool is_standard_layout_v = is_standard_layout<_Tp>::value;
2831 template <typename _Tp>
2832 inline constexpr bool is_pod_v = is_pod<_Tp>::value;
2833 template <typename _Tp>
2834 inline constexpr bool is_literal_type_v = is_literal_type<_Tp>::value;
2835 template <typename _Tp>
2836 inline constexpr bool is_empty_v = is_empty<_Tp>::value;
2837 template <typename _Tp>
2838 inline constexpr bool is_polymorphic_v = is_polymorphic<_Tp>::value;
2839 template <typename _Tp>
2840 inline constexpr bool is_abstract_v = is_abstract<_Tp>::value;
2841 template <typename _Tp>
2842 inline constexpr bool is_final_v = is_final<_Tp>::value;
2843 template <typename _Tp>
2844 inline constexpr bool is_signed_v = is_signed<_Tp>::value;
2845 template <typename _Tp>
2846 inline constexpr bool is_unsigned_v = is_unsigned<_Tp>::value;
2847 template <typename _Tp, typename... _Args>
2848 inline constexpr bool is_constructible_v =
2849 is_constructible<_Tp, _Args...>::value;
2850 template <typename _Tp>
2851 inline constexpr bool is_default_constructible_v =
2852 is_default_constructible<_Tp>::value;
2853 template <typename _Tp>
2854 inline constexpr bool is_copy_constructible_v =
2855 is_copy_constructible<_Tp>::value;
2856 template <typename _Tp>
2857 inline constexpr bool is_move_constructible_v =
2858 is_move_constructible<_Tp>::value;
2859 template <typename _Tp, typename _Up>
2860 inline constexpr bool is_assignable_v = is_assignable<_Tp, _Up>::value;
2861 template <typename _Tp>
2862 inline constexpr bool is_copy_assignable_v = is_copy_assignable<_Tp>::value;
2863 template <typename _Tp>
2864 inline constexpr bool is_move_assignable_v = is_move_assignable<_Tp>::value;
2865 template <typename _Tp>
2866 inline constexpr bool is_destructible_v = is_destructible<_Tp>::value;
2867 template <typename _Tp, typename... _Args>
2868 inline constexpr bool is_trivially_constructible_v =
2869 is_trivially_constructible<_Tp, _Args...>::value;
2870 template <typename _Tp>
2871 inline constexpr bool is_trivially_default_constructible_v =
2872 is_trivially_default_constructible<_Tp>::value;
2873 template <typename _Tp>
2874 inline constexpr bool is_trivially_copy_constructible_v =
2875 is_trivially_copy_constructible<_Tp>::value;
2876 template <typename _Tp>
2877 inline constexpr bool is_trivially_move_constructible_v =
2878 is_trivially_move_constructible<_Tp>::value;
2879 template <typename _Tp, typename _Up>
2880 inline constexpr bool is_trivially_assignable_v =
2881 is_trivially_assignable<_Tp, _Up>::value;
2882 template <typename _Tp>
2883 inline constexpr bool is_trivially_copy_assignable_v =
2884 is_trivially_copy_assignable<_Tp>::value;
2885 template <typename _Tp>
2886 inline constexpr bool is_trivially_move_assignable_v =
2887 is_trivially_move_assignable<_Tp>::value;
2888 template <typename _Tp>
2889 inline constexpr bool is_trivially_destructible_v =
2890 is_trivially_destructible<_Tp>::value;
2891 template <typename _Tp, typename... _Args>
2892 inline constexpr bool is_nothrow_constructible_v =
2893 is_nothrow_constructible<_Tp, _Args...>::value;
2894 template <typename _Tp>
2895 inline constexpr bool is_nothrow_default_constructible_v =
2896 is_nothrow_default_constructible<_Tp>::value;
2897 template <typename _Tp>
2898 inline constexpr bool is_nothrow_copy_constructible_v =
2899 is_nothrow_copy_constructible<_Tp>::value;
2900 template <typename _Tp>
2901 inline constexpr bool is_nothrow_move_constructible_v =
2902 is_nothrow_move_constructible<_Tp>::value;
2903 template <typename _Tp, typename _Up>
2904 inline constexpr bool is_nothrow_assignable_v =
2905 is_nothrow_assignable<_Tp, _Up>::value;
2906 template <typename _Tp>
2907 inline constexpr bool is_nothrow_copy_assignable_v =
2908 is_nothrow_copy_assignable<_Tp>::value;
2909 template <typename _Tp>
2910 inline constexpr bool is_nothrow_move_assignable_v =
2911 is_nothrow_move_assignable<_Tp>::value;
2912 template <typename _Tp>
2913 inline constexpr bool is_nothrow_destructible_v =
2914 is_nothrow_destructible<_Tp>::value;
2915 template <typename _Tp>
2916 inline constexpr bool has_virtual_destructor_v =
2917 has_virtual_destructor<_Tp>::value;
2918 template <typename _Tp>
2919 inline constexpr size_t alignment_of_v = alignment_of<_Tp>::value;
2920 template <typename _Tp>
2921 inline constexpr size_t rank_v = rank<_Tp>::value;
2922 template <typename _Tp, unsigned _Idx = 0>
2923 inline constexpr size_t extent_v = extent<_Tp, _Idx>::value;
2924 template <typename _Tp, typename _Up>
2925 inline constexpr bool is_same_v = is_same<_Tp, _Up>::value;
2926 template <typename _Base, typename _Derived>
2927 inline constexpr bool is_base_of_v = is_base_of<_Base, _Derived>::value;
2928 template <typename _From, typename _To>
2929 inline constexpr bool is_convertible_v = is_convertible<_From, _To>::value;
2932 # define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
2933 #elif defined(__is_identifier)
2934 // For non-GNU compilers:
2935 # if ! __is_identifier(__has_unique_object_representations)
2936 # define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1
2940 #ifdef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2941 # define __cpp_lib_has_unique_object_representations 201606
2942 /// has_unique_object_representations
2943 template<typename _Tp>
2944 struct has_unique_object_representations
2945 : bool_constant<__has_unique_object_representations(
2946 remove_cv_t<remove_all_extents_t<_Tp>>
2950 template<typename _Tp>
2951 inline constexpr bool has_unique_object_representations_v
2952 = has_unique_object_representations<_Tp>::value;
2954 #undef _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP
2957 # define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
2958 #elif defined(__is_identifier)
2959 // For non-GNU compilers:
2960 # if ! __is_identifier(__is_aggregate)
2961 # define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1
2965 #ifdef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
2966 #define __cpp_lib_is_aggregate 201703
2968 template<typename _Tp>
2970 : bool_constant<__is_aggregate(remove_cv_t<_Tp>)> { };
2973 template<typename _Tp>
2974 inline constexpr bool is_aggregate_v = is_aggregate<_Tp>::value;
2976 #undef _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE
2980 #if __cplusplus > 201703L
2984 little = __ORDER_LITTLE_ENDIAN__,
2985 big = __ORDER_BIG_ENDIAN__,
2986 native = __BYTE_ORDER__
2989 /// Remove references and cv-qualifiers.
2990 template<typename _Tp>
2993 using type = __remove_cvref_t<_Tp>;
2996 template<typename _Tp>
2997 using remove_cvref_t = __remove_cvref_t<_Tp>;
2999 /// Identity metafunction.
3000 template<typename _Tp>
3001 struct type_identity { using type = _Tp; };
3003 template<typename _Tp>
3004 using type_identity_t = typename type_identity<_Tp>::type;
3008 _GLIBCXX_END_NAMESPACE_VERSION
3013 #endif // _GLIBCXX_TYPE_TRAITS