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>
104 void iter_move() =
delete;
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>>
145 template<
typename _Tp>
146 static constexpr bool
149 if constexpr (__adl_imove<_Tp>)
157 template<
typename _Tp>
158 using __type =
typename __result<_Tp>::type;
160 template<
typename _Tp>
161 requires __adl_imove<_Tp> ||
requires {
typename __iter_ref_t<_Tp>; }
162 constexpr __type<_Tp>
163 operator() [[nodiscard]] (_Tp&& __e)
const
164 noexcept(_S_noexcept<_Tp>())
166 if constexpr (__adl_imove<_Tp>)
167 return iter_move(
static_cast<_Tp&&
>(__e));
168 else if constexpr (is_lvalue_reference_v<__iter_ref_t<_Tp>>)
169 return std::move(*
static_cast<_Tp&&
>(__e));
171 return *
static_cast<_Tp&&
>(__e);
177 inline namespace _Cpo {
178 inline constexpr __imove::_IterMove iter_move{};
183 template<__detail::__dereferenceable _Tp>
184 requires __detail::__can_reference<ranges::__imove::_IterMove::__type<_Tp&>>
185 using iter_rvalue_reference_t = ranges::__imove::_IterMove::__type<_Tp&>;
187 template<
typename>
struct incrementable_traits { };
189 template<
typename _Tp>
requires is_object_v<_Tp>
190 struct incrementable_traits<_Tp*>
191 {
using difference_type = ptrdiff_t; };
193 template<
typename _Iter>
194 struct incrementable_traits<const _Iter>
195 : incrementable_traits<_Iter> { };
197 template<
typename _Tp>
requires requires {
typename _Tp::difference_type; }
198 struct incrementable_traits<_Tp>
199 {
using difference_type =
typename _Tp::difference_type; };
201 template<
typename _Tp>
202 requires (!
requires {
typename _Tp::difference_type; }
203 &&
requires(
const _Tp& __a,
const _Tp& __b)
204 { { __a - __b } -> integral; })
205 struct incrementable_traits<_Tp>
207 using difference_type
211#if defined __STRICT_ANSI__ && defined __SIZEOF_INT128__
214 struct incrementable_traits<__int128>
215 {
using difference_type = __int128; };
218 struct incrementable_traits<unsigned __int128>
219 {
using difference_type = __int128; };
226 template<
typename _Iter>
227 concept __primary_traits_iter
228 = __is_base_of(__iterator_traits<_Iter, void>, iterator_traits<_Iter>);
230 template<
typename _Iter,
typename _Tp>
231 struct __iter_traits_impl
232 {
using type = iterator_traits<_Iter>; };
234 template<
typename _Iter,
typename _Tp>
235 requires __primary_traits_iter<_Iter>
236 struct __iter_traits_impl<_Iter, _Tp>
237 {
using type = _Tp; };
240 template<
typename _Iter,
typename _Tp = _Iter>
241 using __iter_traits =
typename __iter_traits_impl<_Iter, _Tp>::type;
243 template<
typename _Tp>
244 using __iter_diff_t =
typename
245 __iter_traits<_Tp, incrementable_traits<_Tp>>::difference_type;
248 template<
typename _Tp>
249 using iter_difference_t = __detail::__iter_diff_t<remove_cvref_t<_Tp>>;
253 template<
typename>
struct __cond_value_type { };
255 template<
typename _Tp>
requires is_object_v<_Tp>
256 struct __cond_value_type<_Tp>
257 {
using value_type = remove_cv_t<_Tp>; };
259 template<
typename _Tp>
260 concept __has_member_value_type
261 =
requires {
typename _Tp::value_type; };
263 template<
typename _Tp>
264 concept __has_member_element_type
265 =
requires {
typename _Tp::element_type; };
269 template<
typename>
struct indirectly_readable_traits { };
271 template<
typename _Tp>
272 struct indirectly_readable_traits<_Tp*>
273 : __detail::__cond_value_type<_Tp>
276 template<
typename _Iter>
requires is_array_v<_Iter>
277 struct indirectly_readable_traits<_Iter>
278 {
using value_type = remove_cv_t<remove_extent_t<_Iter>>; };
280 template<
typename _Iter>
281 struct indirectly_readable_traits<const _Iter>
282 : indirectly_readable_traits<_Iter>
285 template<__detail::__has_member_value_type _Tp>
286 struct indirectly_readable_traits<_Tp>
287 : __detail::__cond_value_type<typename _Tp::value_type>
290 template<__detail::__has_member_element_type _Tp>
291 struct indirectly_readable_traits<_Tp>
292 : __detail::__cond_value_type<typename _Tp::element_type>
297 template<__detail::__has_member_value_type _Tp>
298 requires __detail::__has_member_element_type<_Tp>
299 && same_as<remove_cv_t<typename _Tp::element_type>,
300 remove_cv_t<typename _Tp::value_type>>
301 struct indirectly_readable_traits<_Tp>
302 : __detail::__cond_value_type<typename _Tp::value_type>
307 template<__detail::__has_member_value_type _Tp>
308 requires __detail::__has_member_element_type<_Tp>
309 struct indirectly_readable_traits<_Tp>
314 template<
typename _Tp>
315 using __iter_value_t =
typename
316 __iter_traits<_Tp, indirectly_readable_traits<_Tp>>::value_type;
319 template<
typename _Tp>
320 using iter_value_t = __detail::__iter_value_t<remove_cvref_t<_Tp>>;
326 template<
typename _Iter>
327 concept __cpp17_iterator =
requires(_Iter __it)
329 { *__it } -> __can_reference;
330 { ++__it } -> same_as<_Iter&>;
331 { *__it++ } -> __can_reference;
332 } && copyable<_Iter>;
334 template<
typename _Iter>
335 concept __cpp17_input_iterator = __cpp17_iterator<_Iter>
336 && equality_comparable<_Iter>
337 &&
requires(_Iter __it)
339 typename incrementable_traits<_Iter>::difference_type;
340 typename indirectly_readable_traits<_Iter>::value_type;
342 typename indirectly_readable_traits<_Iter>::value_type&>;
344 typename indirectly_readable_traits<_Iter>::value_type&>;
345 requires signed_integral<
346 typename incrementable_traits<_Iter>::difference_type>;
351 template<
typename _Iter>
352 concept __cpp17_fwd_iterator = __cpp17_input_iterator<_Iter>
353 && constructible_from<_Iter>
354 && is_reference_v<iter_reference_t<_Iter>>
355 && same_as<remove_cvref_t<iter_reference_t<_Iter>>,
356 typename indirectly_readable_traits<_Iter>::value_type>
357 &&
requires(_Iter __it)
359 { __it++ } -> convertible_to<const _Iter&>;
360 { *__it++ } -> same_as<iter_reference_t<_Iter>>;
363 template<
typename _Iter>
364 concept __cpp17_bidi_iterator = __cpp17_fwd_iterator<_Iter>
365 &&
requires(_Iter __it)
367 { --__it } -> same_as<_Iter&>;
368 { __it-- } -> convertible_to<const _Iter&>;
369 { *__it-- } -> same_as<iter_reference_t<_Iter>>;
372 template<
typename _Iter>
373 concept __cpp17_randacc_iterator = __cpp17_bidi_iterator<_Iter>
374 && totally_ordered<_Iter>
375 &&
requires(_Iter __it,
376 typename incrementable_traits<_Iter>::difference_type __n)
378 { __it += __n } -> same_as<_Iter&>;
379 { __it -= __n } -> same_as<_Iter&>;
380 { __it + __n } -> same_as<_Iter>;
381 { __n + __it } -> same_as<_Iter>;
382 { __it - __n } -> same_as<_Iter>;
383 { __it - __it } -> same_as<
decltype(__n)>;
384 { __it[__n] } -> convertible_to<iter_reference_t<_Iter>>;
387 template<
typename _Iter>
388 concept __iter_with_nested_types =
requires {
389 typename _Iter::iterator_category;
390 typename _Iter::value_type;
391 typename _Iter::difference_type;
392 typename _Iter::reference;
395 template<
typename _Iter>
396 concept __iter_without_nested_types = !__iter_with_nested_types<_Iter>;
398 template<
typename _Iter>
399 concept __iter_without_category
400 = !
requires {
typename _Iter::iterator_category; };
404 template<
typename _Iterator>
405 requires __detail::__iter_with_nested_types<_Iterator>
406 struct __iterator_traits<_Iterator, void>
409 template<
typename _Iter>
411 {
using type = void; };
413 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
415 {
using type =
typename _Iter::pointer; };
418 using iterator_category =
typename _Iterator::iterator_category;
419 using value_type =
typename _Iterator::value_type;
420 using difference_type =
typename _Iterator::difference_type;
421 using pointer =
typename __ptr<_Iterator>::type;
422 using reference =
typename _Iterator::reference;
425 template<
typename _Iterator>
426 requires __detail::__iter_without_nested_types<_Iterator>
427 && __detail::__cpp17_input_iterator<_Iterator>
428 struct __iterator_traits<_Iterator, void>
431 template<
typename _Iter>
433 {
using type = input_iterator_tag; };
435 template<
typename _Iter>
436 requires requires {
typename _Iter::iterator_category; }
438 {
using type =
typename _Iter::iterator_category; };
440 template<
typename _Iter>
441 requires __detail::__iter_without_category<_Iter>
442 && __detail::__cpp17_randacc_iterator<_Iter>
444 {
using type = random_access_iterator_tag; };
446 template<
typename _Iter>
447 requires __detail::__iter_without_category<_Iter>
448 && __detail::__cpp17_bidi_iterator<_Iter>
450 {
using type = bidirectional_iterator_tag; };
452 template<
typename _Iter>
453 requires __detail::__iter_without_category<_Iter>
454 && __detail::__cpp17_fwd_iterator<_Iter>
456 {
using type = forward_iterator_tag; };
458 template<
typename _Iter>
460 {
using type = void; };
462 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
464 {
using type =
typename _Iter::pointer; };
466 template<
typename _Iter>
467 requires (!
requires {
typename _Iter::pointer; }
468 &&
requires(_Iter& __it) { __it.operator->(); })
472 template<
typename _Iter>
474 {
using type = iter_reference_t<_Iter>; };
476 template<
typename _Iter>
requires requires {
typename _Iter::reference; }
478 {
using type =
typename _Iter::reference; };
481 using iterator_category =
typename __cat<_Iterator>::type;
483 =
typename indirectly_readable_traits<_Iterator>::value_type;
484 using difference_type
485 =
typename incrementable_traits<_Iterator>::difference_type;
486 using pointer =
typename __ptr<_Iterator>::type;
487 using reference =
typename __ref<_Iterator>::type;
490 template<
typename _Iterator>
491 requires __detail::__iter_without_nested_types<_Iterator>
492 && __detail::__cpp17_iterator<_Iterator>
493 struct __iterator_traits<_Iterator, void>
496 template<
typename _Iter>
498 {
using type = void; };
500 template<
typename _Iter>
502 {
typename incrementable_traits<_Iter>::difference_type; }
505 using type =
typename incrementable_traits<_Iter>::difference_type;
509 using iterator_category = output_iterator_tag;
510 using value_type = void;
511 using difference_type =
typename __diff<_Iterator>::type;
512 using pointer = void;
513 using reference = void;
518 template<
typename _Iter>
519 struct __iter_concept_impl;
522 template<
typename _Iter>
523 requires requires {
typename __iter_traits<_Iter>::iterator_concept; }
524 struct __iter_concept_impl<_Iter>
525 {
using type =
typename __iter_traits<_Iter>::iterator_concept; };
528 template<
typename _Iter>
529 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
530 &&
requires {
typename __iter_traits<_Iter>::iterator_category; })
531 struct __iter_concept_impl<_Iter>
532 {
using type =
typename __iter_traits<_Iter>::iterator_category; };
535 template<
typename _Iter>
536 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
537 && !
requires {
typename __iter_traits<_Iter>::iterator_category; }
538 && __primary_traits_iter<_Iter>)
539 struct __iter_concept_impl<_Iter>
540 {
using type = random_access_iterator_tag; };
543 template<
typename _Iter>
544 struct __iter_concept_impl
548 template<
typename _Iter>
549 using __iter_concept =
typename __iter_concept_impl<_Iter>::type;
551 template<
typename _In>
552 concept __indirectly_readable_impl =
requires
554 typename iter_value_t<_In>;
555 typename iter_reference_t<_In>;
556 typename iter_rvalue_reference_t<_In>;
557 requires same_as<iter_reference_t<const _In>,
558 iter_reference_t<_In>>;
559 requires same_as<iter_rvalue_reference_t<const _In>,
560 iter_rvalue_reference_t<_In>>;
562 && common_reference_with<iter_reference_t<_In>&&, iter_value_t<_In>&>
563 && common_reference_with<iter_reference_t<_In>&&,
564 iter_rvalue_reference_t<_In>&&>
565 && common_reference_with<iter_rvalue_reference_t<_In>&&,
566 const iter_value_t<_In>&>;
571 template<
typename _In>
572 concept indirectly_readable
573 = __detail::__indirectly_readable_impl<remove_cvref_t<_In>>;
577 template<
typename _Tp>
578 struct __indirect_value
579 {
using type = iter_value_t<_Tp>&; };
584 template<
typename _Tp>
585 using __indirect_value_t =
typename __detail::__indirect_value<_Tp>::type;
587 template<indirectly_readable _Tp>
588 using iter_common_reference_t
592 template<
typename _Out,
typename _Tp>
593 concept indirectly_writable =
requires(_Out&& __o, _Tp&& __t)
597 const_cast<const iter_reference_t<_Out>&&
>(*__o)
603 namespace ranges::__detail
605 class __max_diff_type;
606 class __max_size_type;
609 template<
typename _Tp>
610 concept __is_signed_int128
612 = same_as<_Tp, __int128>;
618 template<
typename _Tp>
619 concept __is_unsigned_int128
621 = same_as<_Tp, unsigned __int128>;
626 template<
typename _Tp>
627 concept __cv_bool = same_as<const volatile _Tp, const volatile bool>;
629 template<
typename _Tp>
630 concept __integral_nonbool = integral<_Tp> && !__cv_bool<_Tp>;
632 template<
typename _Tp>
633 concept __is_int128 = __is_signed_int128<_Tp> || __is_unsigned_int128<_Tp>;
635 template<
typename _Tp>
636 concept __is_integer_like = __integral_nonbool<_Tp>
638 || same_as<_Tp, __max_diff_type> || same_as<_Tp, __max_size_type>;
640 template<
typename _Tp>
641 concept __is_signed_integer_like = signed_integral<_Tp>
642 || __is_signed_int128<_Tp>
643 || same_as<_Tp, __max_diff_type>;
647 namespace __detail {
using ranges::__detail::__is_signed_integer_like; }
650 template<
typename _Iter>
651 concept weakly_incrementable = movable<_Iter>
652 &&
requires(_Iter __i)
654 typename iter_difference_t<_Iter>;
655 requires __detail::__is_signed_integer_like<iter_difference_t<_Iter>>;
656 { ++__i } -> same_as<_Iter&>;
660 template<
typename _Iter>
661 concept incrementable = regular<_Iter> && weakly_incrementable<_Iter>
662 &&
requires(_Iter __i) { { __i++ } -> same_as<_Iter>; };
664 template<
typename _Iter>
665 concept input_or_output_iterator
666 =
requires(_Iter __i) { { *__i } -> __detail::__can_reference; }
667 && weakly_incrementable<_Iter>;
669 template<
typename _Sent,
typename _Iter>
670 concept sentinel_for = semiregular<_Sent>
671 && input_or_output_iterator<_Iter>
672 && __detail::__weakly_eq_cmp_with<_Sent, _Iter>;
674 template<
typename _Sent,
typename _Iter>
675 inline constexpr bool disable_sized_sentinel_for =
false;
677 template<
typename _Sent,
typename _Iter>
678 concept sized_sentinel_for = sentinel_for<_Sent, _Iter>
679 && !disable_sized_sentinel_for<remove_cv_t<_Sent>, remove_cv_t<_Iter>>
680 &&
requires(
const _Iter& __i,
const _Sent& __s)
682 { __s - __i } -> same_as<iter_difference_t<_Iter>>;
683 { __i - __s } -> same_as<iter_difference_t<_Iter>>;
686 template<
typename _Iter>
687 concept input_iterator = input_or_output_iterator<_Iter>
688 && indirectly_readable<_Iter>
689 &&
requires {
typename __detail::__iter_concept<_Iter>; }
690 && derived_from<__detail::__iter_concept<_Iter>, input_iterator_tag>;
692 template<
typename _Iter,
typename _Tp>
693 concept output_iterator = input_or_output_iterator<_Iter>
694 && indirectly_writable<_Iter, _Tp>
697 template<
typename _Iter>
698 concept forward_iterator = input_iterator<_Iter>
699 && derived_from<__detail::__iter_concept<_Iter>, forward_iterator_tag>
700 && incrementable<_Iter> && sentinel_for<_Iter, _Iter>;
702 template<
typename _Iter>
703 concept bidirectional_iterator = forward_iterator<_Iter>
704 && derived_from<__detail::__iter_concept<_Iter>,
705 bidirectional_iterator_tag>
706 &&
requires(_Iter __i)
708 { --__i } -> same_as<_Iter&>;
709 { __i-- } -> same_as<_Iter>;
712 template<
typename _Iter>
713 concept random_access_iterator = bidirectional_iterator<_Iter>
714 && derived_from<__detail::__iter_concept<_Iter>,
715 random_access_iterator_tag>
716 && totally_ordered<_Iter> && sized_sentinel_for<_Iter, _Iter>
717 &&
requires(_Iter __i,
const _Iter __j,
718 const iter_difference_t<_Iter> __n)
720 { __i += __n } -> same_as<_Iter&>;
721 { __j + __n } -> same_as<_Iter>;
722 { __n + __j } -> same_as<_Iter>;
723 { __i -= __n } -> same_as<_Iter&>;
724 { __j - __n } -> same_as<_Iter>;
725 { __j[__n] } -> same_as<iter_reference_t<_Iter>>;
728 template<
typename _Iter>
729 concept contiguous_iterator = random_access_iterator<_Iter>
730 && derived_from<__detail::__iter_concept<_Iter>, contiguous_iterator_tag>
731 && is_lvalue_reference_v<iter_reference_t<_Iter>>
732 && same_as<iter_value_t<_Iter>, remove_cvref_t<iter_reference_t<_Iter>>>
733 &&
requires(
const _Iter& __i)
736 -> same_as<add_pointer_t<iter_reference_t<_Iter>>>;
743 template<
typename _Fn,
typename _Iter>
744 concept indirectly_unary_invocable = indirectly_readable<_Iter>
745 && copy_constructible<_Fn> && invocable<_Fn&, __indirect_value_t<_Iter>>
746 && invocable<_Fn&, iter_reference_t<_Iter>>
747 && common_reference_with<invoke_result_t<_Fn&, __indirect_value_t<_Iter>>,
748 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
750 template<
typename _Fn,
typename _Iter>
751 concept indirectly_regular_unary_invocable = indirectly_readable<_Iter>
752 && copy_constructible<_Fn>
753 && regular_invocable<_Fn&, __indirect_value_t<_Iter>>
754 && regular_invocable<_Fn&, iter_reference_t<_Iter>>
755 && common_reference_with<invoke_result_t<_Fn&, __indirect_value_t<_Iter>>,
756 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
758 template<
typename _Fn,
typename _Iter>
759 concept indirect_unary_predicate = indirectly_readable<_Iter>
760 && copy_constructible<_Fn> && predicate<_Fn&, __indirect_value_t<_Iter>>
761 && predicate<_Fn&, iter_reference_t<_Iter>>;
763 template<
typename _Fn,
typename _I1,
typename _I2>
764 concept indirect_binary_predicate
765 = indirectly_readable<_I1> && indirectly_readable<_I2>
766 && copy_constructible<_Fn>
767 && predicate<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
768 && predicate<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
769 && predicate<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
770 && predicate<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>;
772 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
773 concept indirect_equivalence_relation
774 = indirectly_readable<_I1> && indirectly_readable<_I2>
775 && copy_constructible<_Fn>
776 && equivalence_relation<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
777 && equivalence_relation<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
778 && equivalence_relation<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
779 && equivalence_relation<_Fn&, iter_reference_t<_I1>,
780 iter_reference_t<_I2>>;
782 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
783 concept indirect_strict_weak_order
784 = indirectly_readable<_I1> && indirectly_readable<_I2>
785 && copy_constructible<_Fn>
786 && strict_weak_order<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
787 && strict_weak_order<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
788 && strict_weak_order<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
789 && strict_weak_order<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>;
791 template<
typename _Fn,
typename... _Is>
792 requires (indirectly_readable<_Is> && ...)
793 && invocable<_Fn, iter_reference_t<_Is>...>
794 using indirect_result_t = invoke_result_t<_Fn, iter_reference_t<_Is>...>;
798 template<
typename _Iter,
typename _Proj>
803 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
804 indirect_result_t<_Proj&, _Iter>
operator*()
const;
808 using __projected_Iter = _Iter;
809 using __projected_Proj = _Proj;
813 template<weakly_incrementable _Iter,
typename _Proj>
814 struct __projected<_Iter, _Proj>
818 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
819 using difference_type = iter_difference_t<_Iter>;
820 indirect_result_t<_Proj&, _Iter>
operator*()
const;
822 using __projected_Iter = _Iter;
823 using __projected_Proj = _Proj;
829 template<indirectly_readable _Iter,
830 indirectly_regular_unary_invocable<_Iter> _Proj>
831 using projected =
typename __detail::__projected<_Iter, _Proj>::__type;
834 template<
typename _Tp>
835 requires same_as<_Tp, projected<
typename _Tp::__projected_Iter,
836 typename _Tp::__projected_Proj>>
837 struct __detail::__indirect_value<_Tp>
839 using _Iter =
typename _Tp::__projected_Iter;
840 using _Proj =
typename _Tp::__projected_Proj;
841 using type = invoke_result_t<_Proj&, __indirect_value_t<_Iter>>;
848 template<
typename _In,
typename _Out>
849 concept indirectly_movable = indirectly_readable<_In>
850 && indirectly_writable<_Out, iter_rvalue_reference_t<_In>>;
852 template<
typename _In,
typename _Out>
853 concept indirectly_movable_storable = indirectly_movable<_In, _Out>
854 && indirectly_writable<_Out, iter_value_t<_In>>
855 && movable<iter_value_t<_In>>
856 && constructible_from<iter_value_t<_In>, iter_rvalue_reference_t<_In>>
857 && assignable_from<iter_value_t<_In>&, iter_rvalue_reference_t<_In>>;
860 template<
typename _In,
typename _Out>
861 concept indirectly_copyable = indirectly_readable<_In>
862 && indirectly_writable<_Out, iter_reference_t<_In>>;
864 template<
typename _In,
typename _Out>
865 concept indirectly_copyable_storable = indirectly_copyable<_In, _Out>
866 && indirectly_writable<_Out, iter_value_t<_In>&>
867 && indirectly_writable<_Out, const iter_value_t<_In>&>
868 && indirectly_writable<_Out, iter_value_t<_In>&&>
869 && indirectly_writable<_Out, const iter_value_t<_In>&&>
870 && copyable<iter_value_t<_In>>
871 && constructible_from<iter_value_t<_In>, iter_reference_t<_In>>
872 && assignable_from<iter_value_t<_In>&, iter_reference_t<_In>>;
880 template<
typename _It1,
typename _It2>
881 void iter_swap(_It1, _It2) =
delete;
885 template<
typename _Tp,
typename _Up>
887 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>
888 || std::__detail::__class_or_enum<remove_reference_t<_Up>>)
889 &&
requires(_Tp&& __t, _Up&& __u) {
890 iter_swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
893 template<
typename _Xp,
typename _Yp>
894 constexpr iter_value_t<_Xp>
895 __iter_exchange_move(_Xp&& __x, _Yp&& __y)
896 noexcept(
noexcept(iter_value_t<_Xp>(iter_move(__x)))
897 &&
noexcept(*__x = iter_move(__y)))
899 iter_value_t<_Xp> __old_value(iter_move(__x));
900 *__x = iter_move(__y);
907 template<
typename _Tp,
typename _Up>
908 static constexpr bool
911 if constexpr (__adl_iswap<_Tp, _Up>)
914 else if constexpr (indirectly_readable<_Tp>
915 && indirectly_readable<_Up>
916 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
926 template<
typename _Tp,
typename _Up>
927 requires __adl_iswap<_Tp, _Up>
928 || (indirectly_readable<remove_reference_t<_Tp>>
929 && indirectly_readable<remove_reference_t<_Up>>
930 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
931 || (indirectly_movable_storable<_Tp, _Up>
932 && indirectly_movable_storable<_Up, _Tp>)
934 operator()(_Tp&& __e1, _Up&& __e2)
const
935 noexcept(_S_noexcept<_Tp, _Up>())
937 if constexpr (__adl_iswap<_Tp, _Up>)
938 iter_swap(
static_cast<_Tp&&
>(__e1),
static_cast<_Up&&
>(__e2));
939 else if constexpr (indirectly_readable<_Tp>
940 && indirectly_readable<_Up>
941 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
942 ranges::swap(*__e1, *__e2);
944 *__e1 = __iswap::__iter_exchange_move(__e2, __e1);
950 inline namespace _Cpo {
951 inline constexpr __iswap::_IterSwap iter_swap{};
957 template<
typename _I1,
typename _I2 = _I1>
958 concept indirectly_swappable
959 = indirectly_readable<_I1> && indirectly_readable<_I2>
960 &&
requires(
const _I1 __i1,
const _I2 __i2)
962 ranges::iter_swap(__i1, __i1);
963 ranges::iter_swap(__i2, __i2);
964 ranges::iter_swap(__i1, __i2);
965 ranges::iter_swap(__i2, __i1);
969 template<
typename _I1,
typename _I2,
typename _Rel,
typename _P1 = identity,
970 typename _P2 = identity>
971 concept indirectly_comparable
972 = indirect_binary_predicate<_Rel, projected<_I1, _P1>,
973 projected<_I2, _P2>>;
976 template<
typename _Iter>
977 concept permutable = forward_iterator<_Iter>
978 && indirectly_movable_storable<_Iter, _Iter>
979 && indirectly_swappable<_Iter, _Iter>;
982 template<
typename _I1,
typename _I2,
typename _Out,
983 typename _Rel = ranges::less,
typename _P1 = identity,
984 typename _P2 = identity>
985 concept mergeable = input_iterator<_I1> && input_iterator<_I2>
986 && weakly_incrementable<_Out> && indirectly_copyable<_I1, _Out>
987 && indirectly_copyable<_I2, _Out>
988 && indirect_strict_weak_order<_Rel, projected<_I1, _P1>,
989 projected<_I2, _P2>>;
992 template<
typename _Iter,
typename _Rel = ranges::less,
993 typename _Proj = identity>
994 concept sortable = permutable<_Iter>
995 && indirect_strict_weak_order<_Rel, projected<_Iter, _Proj>>;
997 struct unreachable_sentinel_t
999 template<weakly_incrementable _It>
1000 friend constexpr bool
1001 operator==(unreachable_sentinel_t,
const _It&)
noexcept
1005 inline constexpr unreachable_sentinel_t unreachable_sentinel{};
1008 namespace ranges::__access
1010 using std::__detail::__class_or_enum;
1012 struct _Decay_copy final
1014 template<
typename _Tp>
1015 constexpr decay_t<_Tp>
1016 operator()(_Tp&& __t)
const
1017 noexcept(is_nothrow_convertible_v<_Tp, decay_t<_Tp>>)
1019 }
inline constexpr __decay_copy{};
1021 template<
typename _Tp>
1022 concept __member_begin =
requires(_Tp& __t)
1024 { __decay_copy(__t.begin()) } -> input_or_output_iterator;
1028 void begin() =
delete;
1030 template<
typename _Tp>
1031 concept __adl_begin = __class_or_enum<remove_reference_t<_Tp>>
1032 &&
requires(_Tp& __t)
1034 { __decay_copy(
begin(__t)) } -> input_or_output_iterator;
1039 template<
typename _Tp>
1040 requires is_array_v<_Tp> || __member_begin<_Tp&> || __adl_begin<_Tp&>
1044 if constexpr (is_array_v<_Tp>)
1046 else if constexpr (__member_begin<_Tp&>)
1056 template<
typename _Tp>
1057 using __range_iter_t
1063_GLIBCXX_END_NAMESPACE_VERSION
strong_ordering operator(const error_code &__lhs, const error_code &__rhs) noexcept
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.
typename common_reference< _Tp... >::type common_reference_t
typename make_signed< _Tp >::type make_signed_t
Alias template for make_signed.
auto declval() noexcept -> decltype(__declval< _Tp >(0))
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
constexpr _Tp && forward(typename std::remove_reference< _Tp >::type &__t) noexcept
Forward an lvalue.
_Tp * begin(valarray< _Tp > &__va) noexcept
Return an iterator pointing to the first element of the valarray.
ISO C++ entities toplevel namespace is std.
constexpr default_sentinel_t default_sentinel
A default sentinel value.