30#ifndef _ITERATOR_CONCEPTS_H
31#define _ITERATOR_CONCEPTS_H 1
33#pragma GCC system_header
35#if __cplusplus >= 202002L
40namespace std _GLIBCXX_VISIBILITY(default)
42_GLIBCXX_BEGIN_NAMESPACE_VERSION
64 struct input_iterator_tag;
65 struct output_iterator_tag;
66 struct forward_iterator_tag;
67 struct bidirectional_iterator_tag;
68 struct random_access_iterator_tag;
69 struct contiguous_iterator_tag;
71 template<
typename _Iterator>
72 struct iterator_traits;
74 template<
typename _Tp>
requires is_object_v<_Tp>
75 struct iterator_traits<_Tp*>;
77 template<
typename _Iterator,
typename>
78 struct __iterator_traits;
82 template<
typename _Tp>
83 using __with_ref = _Tp&;
85 template<
typename _Tp>
86 concept __can_reference =
requires {
typename __with_ref<_Tp>; };
88 template<
typename _Tp>
89 concept __dereferenceable =
requires(_Tp& __t)
91 { *__t } -> __can_reference;
95 template<__detail::__dereferenceable _Tp>
102 namespace __cust_imove
108 template<
typename _Tp>
110 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>)
111 &&
requires(_Tp&& __t) { iter_move(
static_cast<_Tp&&
>(__t)); };
118 template<
typename _Tp>
121 template<
typename _Tp>
123 {
using type = __iter_ref_t<_Tp>; };
126 template<
typename _Tp>
127 requires __adl_imove<_Tp>
132 template<
typename _Tp>
133 requires (!__adl_imove<_Tp>)
134 && is_lvalue_reference_v<__iter_ref_t<_Tp>>
136 {
using type = remove_reference_t<__iter_ref_t<_Tp>>&&; };
138 template<
typename _Tp>
139 static constexpr bool
142 if constexpr (__adl_imove<_Tp>)
150 template<
typename _Tp>
151 using __type =
typename __result<_Tp>::type;
153 template<
typename _Tp>
154 requires __adl_imove<_Tp> ||
requires {
typename __iter_ref_t<_Tp>; }
155 constexpr __type<_Tp>
156 operator() [[nodiscard]] (_Tp&& __e)
const
157 noexcept(_S_noexcept<_Tp>())
159 if constexpr (__adl_imove<_Tp>)
160 return iter_move(
static_cast<_Tp&&
>(__e));
161 else if constexpr (is_lvalue_reference_v<__iter_ref_t<_Tp>>)
162 return std::move(*
static_cast<_Tp&&
>(__e));
164 return *
static_cast<_Tp&&
>(__e);
170 inline namespace __cust
172 inline constexpr __cust_imove::_IMove iter_move{};
177 template<__detail::__dereferenceable _Tp>
179 __can_reference<ranges::__cust_imove::_IMove::__type<_Tp&>>
181 = ranges::__cust_imove::_IMove::__type<_Tp&>;
183 template<
typename>
struct incrementable_traits { };
185 template<
typename _Tp>
requires is_object_v<_Tp>
186 struct incrementable_traits<_Tp*>
187 {
using difference_type = ptrdiff_t; };
189 template<
typename _Iter>
190 struct incrementable_traits<const _Iter>
191 : incrementable_traits<_Iter> { };
193 template<
typename _Tp>
requires requires {
typename _Tp::difference_type; }
194 struct incrementable_traits<_Tp>
195 {
using difference_type =
typename _Tp::difference_type; };
197 template<
typename _Tp>
198 requires (!
requires {
typename _Tp::difference_type; }
199 &&
requires(
const _Tp& __a,
const _Tp& __b)
200 { { __a - __b } -> integral; })
201 struct incrementable_traits<_Tp>
203 using difference_type
207#if defined __STRICT_ANSI__ && defined __SIZEOF_INT128__
210 struct incrementable_traits<__int128>
211 {
using difference_type = __int128; };
214 struct incrementable_traits<unsigned __int128>
215 {
using difference_type = __int128; };
222 template<
typename _Iter>
223 concept __primary_traits_iter
224 = __is_base_of(__iterator_traits<_Iter, void>, iterator_traits<_Iter>);
226 template<
typename _Iter,
typename _Tp>
227 struct __iter_traits_impl
228 {
using type = iterator_traits<_Iter>; };
230 template<
typename _Iter,
typename _Tp>
231 requires __primary_traits_iter<_Iter>
232 struct __iter_traits_impl<_Iter, _Tp>
233 {
using type = _Tp; };
236 template<
typename _Iter,
typename _Tp = _Iter>
237 using __iter_traits =
typename __iter_traits_impl<_Iter, _Tp>::type;
239 template<
typename _Tp>
240 using __iter_diff_t =
typename
241 __iter_traits<_Tp, incrementable_traits<_Tp>>::difference_type;
244 template<
typename _Tp>
245 using iter_difference_t = __detail::__iter_diff_t<remove_cvref_t<_Tp>>;
249 template<
typename>
struct __cond_value_type { };
251 template<
typename _Tp>
requires is_object_v<_Tp>
252 struct __cond_value_type<_Tp>
253 {
using value_type = remove_cv_t<_Tp>; };
255 template<
typename _Tp>
256 concept __has_member_value_type
257 =
requires {
typename _Tp::value_type; };
259 template<
typename _Tp>
260 concept __has_member_element_type
261 =
requires {
typename _Tp::element_type; };
265 template<
typename>
struct indirectly_readable_traits { };
267 template<
typename _Tp>
268 struct indirectly_readable_traits<_Tp*>
269 : __detail::__cond_value_type<_Tp>
272 template<
typename _Iter>
requires is_array_v<_Iter>
273 struct indirectly_readable_traits<_Iter>
274 {
using value_type = remove_cv_t<remove_extent_t<_Iter>>; };
276 template<
typename _Iter>
277 struct indirectly_readable_traits<const _Iter>
278 : indirectly_readable_traits<_Iter>
281 template<__detail::__has_member_value_type _Tp>
282 struct indirectly_readable_traits<_Tp>
283 : __detail::__cond_value_type<typename _Tp::value_type>
286 template<__detail::__has_member_element_type _Tp>
287 struct indirectly_readable_traits<_Tp>
288 : __detail::__cond_value_type<typename _Tp::element_type>
293 template<__detail::__has_member_value_type _Tp>
294 requires __detail::__has_member_element_type<_Tp>
295 && same_as<remove_cv_t<typename _Tp::element_type>,
296 remove_cv_t<typename _Tp::value_type>>
297 struct indirectly_readable_traits<_Tp>
298 : __detail::__cond_value_type<typename _Tp::value_type>
303 template<__detail::__has_member_value_type _Tp>
304 requires __detail::__has_member_element_type<_Tp>
305 struct indirectly_readable_traits<_Tp>
310 template<
typename _Tp>
311 using __iter_value_t =
typename
312 __iter_traits<_Tp, indirectly_readable_traits<_Tp>>::value_type;
315 template<
typename _Tp>
316 using iter_value_t = __detail::__iter_value_t<remove_cvref_t<_Tp>>;
322 template<
typename _Iter>
323 concept __cpp17_iterator =
requires(_Iter __it)
325 { *__it } -> __can_reference;
326 { ++__it } -> same_as<_Iter&>;
327 { *__it++ } -> __can_reference;
328 } && copyable<_Iter>;
330 template<
typename _Iter>
331 concept __cpp17_input_iterator = __cpp17_iterator<_Iter>
332 && equality_comparable<_Iter>
333 &&
requires(_Iter __it)
335 typename incrementable_traits<_Iter>::difference_type;
336 typename indirectly_readable_traits<_Iter>::value_type;
337 typename common_reference_t<iter_reference_t<_Iter>&&,
338 typename indirectly_readable_traits<_Iter>::value_type&>;
339 typename common_reference_t<
decltype(*__it++)&&,
340 typename indirectly_readable_traits<_Iter>::value_type&>;
341 requires signed_integral<
342 typename incrementable_traits<_Iter>::difference_type>;
345 template<
typename _Iter>
346 concept __cpp17_fwd_iterator = __cpp17_input_iterator<_Iter>
347 && constructible_from<_Iter>
348 && is_lvalue_reference_v<iter_reference_t<_Iter>>
349 && same_as<remove_cvref_t<iter_reference_t<_Iter>>,
350 typename indirectly_readable_traits<_Iter>::value_type>
351 &&
requires(_Iter __it)
353 { __it++ } -> convertible_to<const _Iter&>;
354 { *__it++ } -> same_as<iter_reference_t<_Iter>>;
357 template<
typename _Iter>
358 concept __cpp17_bidi_iterator = __cpp17_fwd_iterator<_Iter>
359 &&
requires(_Iter __it)
361 { --__it } -> same_as<_Iter&>;
362 { __it-- } -> convertible_to<const _Iter&>;
363 { *__it-- } -> same_as<iter_reference_t<_Iter>>;
366 template<
typename _Iter>
367 concept __cpp17_randacc_iterator = __cpp17_bidi_iterator<_Iter>
368 && totally_ordered<_Iter>
369 &&
requires(_Iter __it,
370 typename incrementable_traits<_Iter>::difference_type __n)
372 { __it += __n } -> same_as<_Iter&>;
373 { __it -= __n } -> same_as<_Iter&>;
374 { __it + __n } -> same_as<_Iter>;
375 { __n + __it } -> same_as<_Iter>;
376 { __it - __n } -> same_as<_Iter>;
377 { __it - __it } -> same_as<
decltype(__n)>;
378 { __it[__n] } -> convertible_to<iter_reference_t<_Iter>>;
381 template<
typename _Iter>
382 concept __iter_with_nested_types =
requires {
383 typename _Iter::iterator_category;
384 typename _Iter::value_type;
385 typename _Iter::difference_type;
386 typename _Iter::reference;
389 template<
typename _Iter>
390 concept __iter_without_nested_types = !__iter_with_nested_types<_Iter>;
392 template<
typename _Iter>
393 concept __iter_without_category
394 = !
requires {
typename _Iter::iterator_category; };
398 template<
typename _Iterator>
399 requires __detail::__iter_with_nested_types<_Iterator>
400 struct __iterator_traits<_Iterator, void>
403 template<
typename _Iter>
405 {
using type = void; };
407 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
409 {
using type =
typename _Iter::pointer; };
412 using iterator_category =
typename _Iterator::iterator_category;
413 using value_type =
typename _Iterator::value_type;
414 using difference_type =
typename _Iterator::difference_type;
415 using pointer =
typename __ptr<_Iterator>::type;
416 using reference =
typename _Iterator::reference;
419 template<
typename _Iterator>
420 requires __detail::__iter_without_nested_types<_Iterator>
421 && __detail::__cpp17_input_iterator<_Iterator>
422 struct __iterator_traits<_Iterator, void>
425 template<
typename _Iter>
427 {
using type = input_iterator_tag; };
429 template<
typename _Iter>
430 requires requires {
typename _Iter::iterator_category; }
432 {
using type =
typename _Iter::iterator_category; };
434 template<
typename _Iter>
435 requires __detail::__iter_without_category<_Iter>
436 && __detail::__cpp17_randacc_iterator<_Iter>
438 {
using type = random_access_iterator_tag; };
440 template<
typename _Iter>
441 requires __detail::__iter_without_category<_Iter>
442 && __detail::__cpp17_bidi_iterator<_Iter>
444 {
using type = bidirectional_iterator_tag; };
446 template<
typename _Iter>
447 requires __detail::__iter_without_category<_Iter>
448 && __detail::__cpp17_fwd_iterator<_Iter>
450 {
using type = forward_iterator_tag; };
452 template<
typename _Iter>
454 {
using type = void; };
456 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
458 {
using type =
typename _Iter::pointer; };
460 template<
typename _Iter>
461 requires (!
requires {
typename _Iter::pointer; }
462 &&
requires(_Iter& __it) { __it.operator->(); })
466 template<
typename _Iter>
468 {
using type = iter_reference_t<_Iter>; };
470 template<
typename _Iter>
requires requires {
typename _Iter::reference; }
472 {
using type =
typename _Iter::reference; };
475 using iterator_category =
typename __cat<_Iterator>::type;
477 =
typename indirectly_readable_traits<_Iterator>::value_type;
478 using difference_type
479 =
typename incrementable_traits<_Iterator>::difference_type;
480 using pointer =
typename __ptr<_Iterator>::type;
481 using reference =
typename __ref<_Iterator>::type;
484 template<
typename _Iterator>
485 requires __detail::__iter_without_nested_types<_Iterator>
486 && __detail::__cpp17_iterator<_Iterator>
487 struct __iterator_traits<_Iterator, void>
490 template<
typename _Iter>
492 {
using type = void; };
494 template<
typename _Iter>
496 {
typename incrementable_traits<_Iter>::difference_type; }
499 using type =
typename incrementable_traits<_Iter>::difference_type;
503 using iterator_category = output_iterator_tag;
504 using value_type = void;
505 using difference_type =
typename __diff<_Iterator>::type;
506 using pointer = void;
507 using reference = void;
512 template<
typename _Iter>
513 struct __iter_concept_impl;
516 template<
typename _Iter>
517 requires requires {
typename __iter_traits<_Iter>::iterator_concept; }
518 struct __iter_concept_impl<_Iter>
519 {
using type =
typename __iter_traits<_Iter>::iterator_concept; };
522 template<
typename _Iter>
523 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
524 &&
requires {
typename __iter_traits<_Iter>::iterator_category; })
525 struct __iter_concept_impl<_Iter>
526 {
using type =
typename __iter_traits<_Iter>::iterator_category; };
529 template<
typename _Iter>
530 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
531 && !
requires {
typename __iter_traits<_Iter>::iterator_category; }
532 && __primary_traits_iter<_Iter>)
533 struct __iter_concept_impl<_Iter>
534 {
using type = random_access_iterator_tag; };
537 template<
typename _Iter>
538 struct __iter_concept_impl
542 template<
typename _Iter>
543 using __iter_concept =
typename __iter_concept_impl<_Iter>::type;
545 template<
typename _In>
546 concept __indirectly_readable_impl =
requires
548 typename iter_value_t<_In>;
549 typename iter_reference_t<_In>;
550 typename iter_rvalue_reference_t<_In>;
551 requires same_as<iter_reference_t<const _In>,
552 iter_reference_t<_In>>;
553 requires same_as<iter_rvalue_reference_t<const _In>,
554 iter_rvalue_reference_t<_In>>;
556 && common_reference_with<iter_reference_t<_In>&&, iter_value_t<_In>&>
557 && common_reference_with<iter_reference_t<_In>&&,
558 iter_rvalue_reference_t<_In>&&>
559 && common_reference_with<iter_rvalue_reference_t<_In>&&,
560 const iter_value_t<_In>&>;
565 template<
typename _In>
567 = __detail::__indirectly_readable_impl<remove_cvref_t<_In>>;
569 template<indirectly_readable _Tp>
570 using iter_common_reference_t
571 = common_reference_t<iter_reference_t<_Tp>, iter_value_t<_Tp>&>;
574 template<
typename _Out,
typename _Tp>
579 const_cast<const iter_reference_t<_Out>&&
>(*__o)
585 namespace ranges::__detail
591 template<
typename _Tp>
592 concept __is_signed_int128
600 template<
typename _Tp>
601 concept __is_unsigned_int128
608 template<
typename _Tp>
611 template<
typename _Tp>
614 template<
typename _Tp>
617 template<
typename _Tp>
622 template<
typename _Tp>
629 namespace __detail {
using ranges::__detail::__is_signed_integer_like; }
632 template<
typename _Iter>
634 &&
requires(_Iter __i)
636 typename iter_difference_t<_Iter>;
637 requires __detail::__is_signed_integer_like<iter_difference_t<_Iter>>;
642 template<
typename _Iter>
644 &&
requires(_Iter __i) { { __i++ } -> same_as<_Iter>; };
646 template<
typename _Iter>
647 concept input_or_output_iterator
648 =
requires(_Iter __i) { { *__i } -> __detail::__can_reference; }
649 && weakly_incrementable<_Iter>;
651 template<
typename _Sent,
typename _Iter>
652 concept sentinel_for = semiregular<_Sent>
653 && input_or_output_iterator<_Iter>
654 && __detail::__weakly_eq_cmp_with<_Sent, _Iter>;
656 template<
typename _Sent,
typename _Iter>
657 inline constexpr bool disable_sized_sentinel_for =
false;
659 template<
typename _Sent,
typename _Iter>
660 concept sized_sentinel_for = sentinel_for<_Sent, _Iter>
661 && !disable_sized_sentinel_for<remove_cv_t<_Sent>, remove_cv_t<_Iter>>
662 &&
requires(
const _Iter& __i,
const _Sent& __s)
664 { __s - __i } -> same_as<iter_difference_t<_Iter>>;
665 { __i - __s } -> same_as<iter_difference_t<_Iter>>;
668 template<
typename _Iter>
669 concept input_iterator = input_or_output_iterator<_Iter>
670 && indirectly_readable<_Iter>
671 &&
requires {
typename __detail::__iter_concept<_Iter>; }
672 && derived_from<__detail::__iter_concept<_Iter>, input_iterator_tag>;
674 template<
typename _Iter,
typename _Tp>
675 concept output_iterator = input_or_output_iterator<_Iter>
676 && indirectly_writable<_Iter, _Tp>
679 template<
typename _Iter>
680 concept forward_iterator = input_iterator<_Iter>
681 && derived_from<__detail::__iter_concept<_Iter>, forward_iterator_tag>
682 && incrementable<_Iter> && sentinel_for<_Iter, _Iter>;
684 template<
typename _Iter>
685 concept bidirectional_iterator = forward_iterator<_Iter>
686 && derived_from<__detail::__iter_concept<_Iter>,
687 bidirectional_iterator_tag>
688 &&
requires(_Iter __i)
690 { --__i } -> same_as<_Iter&>;
691 { __i-- } -> same_as<_Iter>;
694 template<
typename _Iter>
695 concept random_access_iterator = bidirectional_iterator<_Iter>
696 && derived_from<__detail::__iter_concept<_Iter>,
697 random_access_iterator_tag>
698 && totally_ordered<_Iter> && sized_sentinel_for<_Iter, _Iter>
699 &&
requires(_Iter __i,
const _Iter __j,
700 const iter_difference_t<_Iter> __n)
702 { __i += __n } -> same_as<_Iter&>;
703 { __j + __n } -> same_as<_Iter>;
704 { __n + __j } -> same_as<_Iter>;
705 { __i -= __n } -> same_as<_Iter&>;
706 { __j - __n } -> same_as<_Iter>;
707 { __j[__n] } -> same_as<iter_reference_t<_Iter>>;
710 template<
typename _Iter>
711 concept contiguous_iterator = random_access_iterator<_Iter>
712 && derived_from<__detail::__iter_concept<_Iter>, contiguous_iterator_tag>
713 && is_lvalue_reference_v<iter_reference_t<_Iter>>
714 && same_as<iter_value_t<_Iter>, remove_cvref_t<iter_reference_t<_Iter>>>
715 &&
requires(
const _Iter& __i)
718 -> same_as<add_pointer_t<iter_reference_t<_Iter>>>;
725 template<
typename _Fn,
typename _Iter>
726 concept indirectly_unary_invocable = indirectly_readable<_Iter>
727 && copy_constructible<_Fn> && invocable<_Fn&, iter_value_t<_Iter>&>
728 && invocable<_Fn&, iter_reference_t<_Iter>>
729 && invocable<_Fn&, iter_common_reference_t<_Iter>>
730 && common_reference_with<invoke_result_t<_Fn&, iter_value_t<_Iter>&>,
731 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
733 template<
typename _Fn,
typename _Iter>
734 concept indirectly_regular_unary_invocable = indirectly_readable<_Iter>
735 && copy_constructible<_Fn>
736 && regular_invocable<_Fn&, iter_value_t<_Iter>&>
737 && regular_invocable<_Fn&, iter_reference_t<_Iter>>
738 && regular_invocable<_Fn&, iter_common_reference_t<_Iter>>
739 && common_reference_with<invoke_result_t<_Fn&, iter_value_t<_Iter>&>,
740 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
742 template<
typename _Fn,
typename _Iter>
743 concept indirect_unary_predicate = indirectly_readable<_Iter>
744 && copy_constructible<_Fn> && predicate<_Fn&, iter_value_t<_Iter>&>
745 && predicate<_Fn&, iter_reference_t<_Iter>>
746 && predicate<_Fn&, iter_common_reference_t<_Iter>>;
748 template<
typename _Fn,
typename _I1,
typename _I2>
749 concept indirect_binary_predicate
750 = indirectly_readable<_I1> && indirectly_readable<_I2>
751 && copy_constructible<_Fn>
752 && predicate<_Fn&, iter_value_t<_I1>&, iter_value_t<_I2>&>
753 && predicate<_Fn&, iter_value_t<_I1>&, iter_reference_t<_I2>>
754 && predicate<_Fn&, iter_reference_t<_I1>, iter_value_t<_I2>&>
755 && predicate<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>
756 && predicate<_Fn&, iter_common_reference_t<_I1>,
757 iter_common_reference_t<_I2>>;
759 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
760 concept indirect_equivalence_relation
761 = indirectly_readable<_I1> && indirectly_readable<_I2>
762 && copy_constructible<_Fn>
763 && equivalence_relation<_Fn&, iter_value_t<_I1>&, iter_value_t<_I2>&>
764 && equivalence_relation<_Fn&, iter_value_t<_I1>&, iter_reference_t<_I2>>
765 && equivalence_relation<_Fn&, iter_reference_t<_I1>, iter_value_t<_I2>&>
766 && equivalence_relation<_Fn&, iter_reference_t<_I1>,
767 iter_reference_t<_I2>>
768 && equivalence_relation<_Fn&, iter_common_reference_t<_I1>,
769 iter_common_reference_t<_I2>>;
771 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
772 concept indirect_strict_weak_order
773 = indirectly_readable<_I1> && indirectly_readable<_I2>
774 && copy_constructible<_Fn>
775 && strict_weak_order<_Fn&, iter_value_t<_I1>&, iter_value_t<_I2>&>
776 && strict_weak_order<_Fn&, iter_value_t<_I1>&, iter_reference_t<_I2>>
777 && strict_weak_order<_Fn&, iter_reference_t<_I1>, iter_value_t<_I2>&>
778 && strict_weak_order<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>
779 && strict_weak_order<_Fn&, iter_common_reference_t<_I1>,
780 iter_common_reference_t<_I2>>;
782 template<
typename _Fn,
typename... _Is>
783 requires (indirectly_readable<_Is> && ...)
784 && invocable<_Fn, iter_reference_t<_Is>...>
785 using indirect_result_t = invoke_result_t<_Fn, iter_reference_t<_Is>...>;
789 template<
typename _Iter,
typename _Proj>
794 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
795 indirect_result_t<_Proj&, _Iter>
operator*()
const;
799 template<weakly_incrementable _Iter,
typename _Proj>
800 struct __projected<_Iter, _Proj>
804 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
805 using difference_type = iter_difference_t<_Iter>;
806 indirect_result_t<_Proj&, _Iter>
operator*()
const;
812 template<indirectly_readable _Iter,
814 using projected =
typename __detail::__projected<_Iter, _Proj>::__type;
820 template<
typename _In,
typename _Out>
824 template<
typename _In,
typename _Out>
827 && movable<iter_value_t<_In>>
832 template<
typename _In,
typename _Out>
836 template<
typename _In,
typename _Out>
842 && copyable<iter_value_t<_In>>
850 namespace __cust_iswap
852 template<
typename _It1,
typename _It2>
853 void iter_swap(_It1, _It2) =
delete;
857 template<
typename _Tp,
typename _Up>
859 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>
860 || std::__detail::__class_or_enum<remove_reference_t<_Up>>)
861 &&
requires(_Tp&& __t, _Up&& __u) {
862 iter_swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
865 template<
typename _Xp,
typename _Yp>
866 constexpr iter_value_t<_Xp>
867 __iter_exchange_move(_Xp&& __x, _Yp&& __y)
868 noexcept(
noexcept(iter_value_t<_Xp>(iter_move(__x)))
869 &&
noexcept(*__x = iter_move(__y)))
871 iter_value_t<_Xp> __old_value(iter_move(__x));
872 *__x = iter_move(__y);
879 template<
typename _Tp,
typename _Up>
880 static constexpr bool
883 if constexpr (__adl_iswap<_Tp, _Up>)
888 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
898 template<
typename _Tp,
typename _Up>
899 requires __adl_iswap<_Tp, _Up>
902 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
903 || (indirectly_movable_storable<_Tp, _Up>
904 && indirectly_movable_storable<_Up, _Tp>)
906 operator()(_Tp&& __e1, _Up&& __e2)
const
907 noexcept(_S_noexcept<_Tp, _Up>())
909 if constexpr (__adl_iswap<_Tp, _Up>)
910 iter_swap(
static_cast<_Tp&&
>(__e1),
static_cast<_Up&&
>(__e2));
913 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
914 ranges::swap(*__e1, *__e2);
916 *__e1 = __iter_exchange_move(__e2, __e1);
922 inline namespace __cust
924 inline constexpr __cust_iswap::_IterSwap iter_swap{};
930 template<
typename _I1,
typename _I2 = _I1>
933 &&
requires(
const _I1 __i1,
const _I2 __i2)
935 ranges::iter_swap(__i1, __i1);
936 ranges::iter_swap(__i2, __i2);
937 ranges::iter_swap(__i1, __i2);
938 ranges::iter_swap(__i2, __i1);
943 typename _P2 = identity>
945 = indirect_binary_predicate<_Rel, projected<_I1, _P1>,
946 projected<_I2, _P2>>;
949 template<
typename _Iter>
951 && indirectly_movable_storable<_Iter, _Iter>
955 template<
typename _I1,
typename _I2,
typename _Out,
956 typename _Rel = ranges::less,
typename _P1 = identity,
957 typename _P2 = identity>
958 concept mergeable = input_iterator<_I1> && input_iterator<_I2>
961 && indirect_strict_weak_order<_Rel, projected<_I1, _P1>,
962 projected<_I2, _P2>>;
965 template<
typename _Iter,
typename _Rel = ranges::less,
966 typename _Proj = identity>
968 && indirect_strict_weak_order<_Rel, projected<_Iter, _Proj>>;
970 struct unreachable_sentinel_t
972 template<weakly_incrementable _It>
973 friend constexpr bool
974 operator==(unreachable_sentinel_t,
const _It&)
noexcept
978 inline constexpr unreachable_sentinel_t unreachable_sentinel{};
981 namespace ranges::__cust_access
983 using std::__detail::__class_or_enum;
985 struct _Decay_copy final
987 template<
typename _Tp>
988 constexpr decay_t<_Tp>
989 operator()(_Tp&& __t)
const
990 noexcept(is_nothrow_convertible_v<_Tp, decay_t<_Tp>>)
992 }
inline constexpr __decay_copy{};
994 template<
typename _Tp>
995 concept __member_begin =
requires(_Tp& __t)
997 { __decay_copy(__t.begin()) } -> input_or_output_iterator;
1001 void begin(
auto&) =
delete;
1002 void begin(
const auto&) =
delete;
1004 template<
typename _Tp>
1005 concept __adl_begin = __class_or_enum<remove_reference_t<_Tp>>
1006 &&
requires(_Tp& __t)
1008 { __decay_copy(begin(__t)) } -> input_or_output_iterator;
1013 template<
typename _Tp>
1014 requires is_array_v<_Tp> || __member_begin<_Tp&> || __adl_begin<_Tp&>
1018 if constexpr (is_array_v<_Tp>)
1020 else if constexpr (__member_begin<_Tp&>)
1030 template<
typename _Tp>
1031 using __range_iter_t
1037_GLIBCXX_END_NAMESPACE_VERSION
constexpr complex< _Tp > operator*(const complex< _Tp > &__x, const complex< _Tp > &__y)
Return new complex value x times y.
constexpr _Tp * to_address(_Tp *__ptr) noexcept
Obtain address referenced by a pointer to an object.
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
ISO C++ entities toplevel namespace is std.
ranges::__cust_imove::_IMove::__type< _Tp & > iter_rvalue_reference_t
The result type of ranges::iter_move(std::declval<_Tp&>())
constexpr default_sentinel_t default_sentinel
A default sentinel value.
typename __detail::__projected< _Iter, _Proj >::__type projected
[projected], projected
[func.identity] The identity function.
[concept.same], concept same_as
[concept.assignable], concept assignable_from
[concept.constructible], concept constructible_from
Requirements for types that are readable by applying operator*.
Requirements for writing a value into an iterator's referenced object.
Requirements on types that can be incremented with ++.
[alg.req.ind.move], concept indirectly_movable
[alg.req.ind.copy], concept indirectly_copyable
[alg.req.ind.swap], concept indirectly_swappable
[alg.req.ind.cmp], concept indirectly_comparable
[alg.req.permutable], concept permutable
[alg.req.mergeable], concept mergeable
[alg.req.sortable], concept sortable