30#ifndef _ITERATOR_CONCEPTS_H
31#define _ITERATOR_CONCEPTS_H 1
34#pragma GCC system_header
37#if __cplusplus >= 202002L
42#pragma GCC diagnostic push
43#pragma GCC diagnostic ignored "-Wpedantic"
45namespace std _GLIBCXX_VISIBILITY(default)
47_GLIBCXX_BEGIN_NAMESPACE_VERSION
69 struct input_iterator_tag;
70 struct output_iterator_tag;
71 struct forward_iterator_tag;
72 struct bidirectional_iterator_tag;
73 struct random_access_iterator_tag;
74 struct contiguous_iterator_tag;
76 template<
typename _Iterator>
77 struct iterator_traits;
79 template<
typename _Tp>
requires is_object_v<_Tp>
80 struct iterator_traits<_Tp*>;
82 template<
typename _Iterator,
typename>
83 struct __iterator_traits;
87 template<
typename _Tp>
88 using __with_ref = _Tp&;
90 template<
typename _Tp>
91 concept __can_reference =
requires {
typename __with_ref<_Tp>; };
93 template<
typename _Tp>
94 concept __dereferenceable =
requires(_Tp& __t)
96 { *__t } -> __can_reference;
100 template<__detail::__dereferenceable _Tp>
108 void iter_move() =
delete;
110 template<
typename _Tp>
112 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>)
113 &&
requires(_Tp&& __t) { iter_move(
static_cast<_Tp&&
>(__t)); };
118 template<
typename _Tp>
120 {
using type = iter_reference_t<_Tp>; };
122 template<
typename _Tp>
123 requires __adl_imove<_Tp>
127 template<
typename _Tp>
128 requires (!__adl_imove<_Tp>)
129 && is_lvalue_reference_v<iter_reference_t<_Tp>>
131 {
using type = remove_reference_t<iter_reference_t<_Tp>>&&; };
133 template<
typename _Tp>
134 static constexpr bool
137 if constexpr (__adl_imove<_Tp>)
145 template<std::__detail::__dereferenceable _Tp>
146 using __type =
typename __result<_Tp>::type;
148 template<std::__detail::__dereferenceable _Tp>
150 constexpr __type<_Tp>
151 operator()(_Tp&& __e)
const
152 noexcept(_S_noexcept<_Tp>())
154 if constexpr (__adl_imove<_Tp>)
155 return iter_move(
static_cast<_Tp&&
>(__e));
156 else if constexpr (is_lvalue_reference_v<iter_reference_t<_Tp>>)
157 return static_cast<__type<_Tp>
>(*__e);
165 inline namespace _Cpo {
166 inline constexpr __imove::_IterMove iter_move{};
170 template<__detail::__dereferenceable _Tp>
171 requires __detail::__can_reference<ranges::__imove::_IterMove::__type<_Tp&>>
172 using iter_rvalue_reference_t = ranges::__imove::_IterMove::__type<_Tp&>;
174 template<
typename>
struct incrementable_traits { };
176 template<
typename _Tp>
requires is_object_v<_Tp>
177 struct incrementable_traits<_Tp*>
178 {
using difference_type = ptrdiff_t; };
180 template<
typename _Iter>
181 struct incrementable_traits<const _Iter>
182 : incrementable_traits<_Iter> { };
184 template<
typename _Tp>
requires requires {
typename _Tp::difference_type; }
185 struct incrementable_traits<_Tp>
186 {
using difference_type =
typename _Tp::difference_type; };
188 template<
typename _Tp>
189 requires (!
requires {
typename _Tp::difference_type; }
190 &&
requires(
const _Tp& __a,
const _Tp& __b)
191 { { __a - __b } -> integral; })
192 struct incrementable_traits<_Tp>
194 using difference_type
198#if defined __STRICT_ANSI__ && defined __SIZEOF_INT128__
201 struct incrementable_traits<__int128>
202 {
using difference_type = __int128; };
205 struct incrementable_traits<unsigned __int128>
206 {
using difference_type = __int128; };
213 template<
typename _Iter>
214 concept __primary_traits_iter
215 = __is_base_of(__iterator_traits<_Iter, void>, iterator_traits<_Iter>);
217 template<
typename _Iter,
typename _Tp>
218 struct __iter_traits_impl
219 {
using type = iterator_traits<_Iter>; };
221 template<
typename _Iter,
typename _Tp>
222 requires __primary_traits_iter<_Iter>
223 struct __iter_traits_impl<_Iter, _Tp>
224 {
using type = _Tp; };
227 template<
typename _Iter,
typename _Tp = _Iter>
228 using __iter_traits =
typename __iter_traits_impl<_Iter, _Tp>::type;
230 template<
typename _Tp>
231 using __iter_diff_t =
typename
232 __iter_traits<_Tp, incrementable_traits<_Tp>>::difference_type;
235 template<
typename _Tp>
236 using iter_difference_t = __detail::__iter_diff_t<remove_cvref_t<_Tp>>;
240 template<
typename>
struct __cond_value_type { };
242 template<
typename _Tp>
requires is_object_v<_Tp>
243 struct __cond_value_type<_Tp>
244 {
using value_type = remove_cv_t<_Tp>; };
246 template<
typename _Tp>
247 concept __has_member_value_type
248 =
requires {
typename _Tp::value_type; };
250 template<
typename _Tp>
251 concept __has_member_element_type
252 =
requires {
typename _Tp::element_type; };
256 template<
typename>
struct indirectly_readable_traits { };
258 template<
typename _Tp>
259 struct indirectly_readable_traits<_Tp*>
260 : __detail::__cond_value_type<_Tp>
263 template<
typename _Iter>
requires is_array_v<_Iter>
264 struct indirectly_readable_traits<_Iter>
265 {
using value_type = remove_cv_t<remove_extent_t<_Iter>>; };
267 template<
typename _Iter>
268 struct indirectly_readable_traits<const _Iter>
269 : indirectly_readable_traits<_Iter>
272 template<__detail::__has_member_value_type _Tp>
273 struct indirectly_readable_traits<_Tp>
274 : __detail::__cond_value_type<typename _Tp::value_type>
277 template<__detail::__has_member_element_type _Tp>
278 struct indirectly_readable_traits<_Tp>
279 : __detail::__cond_value_type<typename _Tp::element_type>
284 template<__detail::__has_member_value_type _Tp>
285 requires __detail::__has_member_element_type<_Tp>
286 && same_as<remove_cv_t<typename _Tp::element_type>,
287 remove_cv_t<typename _Tp::value_type>>
288 struct indirectly_readable_traits<_Tp>
289 : __detail::__cond_value_type<typename _Tp::value_type>
294 template<__detail::__has_member_value_type _Tp>
295 requires __detail::__has_member_element_type<_Tp>
296 struct indirectly_readable_traits<_Tp>
301 template<
typename _Tp>
302 using __iter_value_t =
typename
303 __iter_traits<_Tp, indirectly_readable_traits<_Tp>>::value_type;
306 template<
typename _Tp>
307 using iter_value_t = __detail::__iter_value_t<remove_cvref_t<_Tp>>;
313 template<
typename _Iter>
314 concept __cpp17_iterator =
requires(_Iter __it)
316 { *__it } -> __can_reference;
317 { ++__it } -> same_as<_Iter&>;
318 { *__it++ } -> __can_reference;
319 } && copyable<_Iter>;
321 template<
typename _Iter>
322 concept __cpp17_input_iterator = __cpp17_iterator<_Iter>
323 && equality_comparable<_Iter>
324 &&
requires(_Iter __it)
326 typename incrementable_traits<_Iter>::difference_type;
327 typename indirectly_readable_traits<_Iter>::value_type;
329 typename indirectly_readable_traits<_Iter>::value_type&>;
331 typename indirectly_readable_traits<_Iter>::value_type&>;
332 requires signed_integral<
333 typename incrementable_traits<_Iter>::difference_type>;
338 template<
typename _Iter>
339 concept __cpp17_fwd_iterator = __cpp17_input_iterator<_Iter>
340 && constructible_from<_Iter>
341 && is_reference_v<iter_reference_t<_Iter>>
342 && same_as<remove_cvref_t<iter_reference_t<_Iter>>,
343 typename indirectly_readable_traits<_Iter>::value_type>
344 &&
requires(_Iter __it)
346 { __it++ } -> convertible_to<const _Iter&>;
347 { *__it++ } -> same_as<iter_reference_t<_Iter>>;
350 template<
typename _Iter>
351 concept __cpp17_bidi_iterator = __cpp17_fwd_iterator<_Iter>
352 &&
requires(_Iter __it)
354 { --__it } -> same_as<_Iter&>;
355 { __it-- } -> convertible_to<const _Iter&>;
356 { *__it-- } -> same_as<iter_reference_t<_Iter>>;
359 template<
typename _Iter>
360 concept __cpp17_randacc_iterator = __cpp17_bidi_iterator<_Iter>
361 && totally_ordered<_Iter>
362 &&
requires(_Iter __it,
363 typename incrementable_traits<_Iter>::difference_type __n)
365 { __it += __n } -> same_as<_Iter&>;
366 { __it -= __n } -> same_as<_Iter&>;
367 { __it + __n } -> same_as<_Iter>;
368 { __n + __it } -> same_as<_Iter>;
369 { __it - __n } -> same_as<_Iter>;
370 { __it - __it } -> same_as<
decltype(__n)>;
371 { __it[__n] } -> convertible_to<iter_reference_t<_Iter>>;
374 template<
typename _Iter>
375 concept __iter_with_nested_types =
requires {
376 typename _Iter::iterator_category;
377 typename _Iter::value_type;
378 typename _Iter::difference_type;
379 typename _Iter::reference;
382 template<
typename _Iter>
383 concept __iter_without_nested_types = !__iter_with_nested_types<_Iter>;
385 template<
typename _Iter>
386 concept __iter_without_category
387 = !
requires {
typename _Iter::iterator_category; };
391 template<
typename _Iterator>
392 requires __detail::__iter_with_nested_types<_Iterator>
393 struct __iterator_traits<_Iterator, void>
396 template<
typename _Iter>
398 {
using type = void; };
400 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
402 {
using type =
typename _Iter::pointer; };
405 using iterator_category =
typename _Iterator::iterator_category;
406 using value_type =
typename _Iterator::value_type;
407 using difference_type =
typename _Iterator::difference_type;
408 using pointer =
typename __ptr<_Iterator>::type;
409 using reference =
typename _Iterator::reference;
412 template<
typename _Iterator>
413 requires __detail::__iter_without_nested_types<_Iterator>
414 && __detail::__cpp17_input_iterator<_Iterator>
415 struct __iterator_traits<_Iterator, void>
418 template<
typename _Iter>
420 {
using type = input_iterator_tag; };
422 template<
typename _Iter>
423 requires requires {
typename _Iter::iterator_category; }
425 {
using type =
typename _Iter::iterator_category; };
427 template<
typename _Iter>
428 requires __detail::__iter_without_category<_Iter>
429 && __detail::__cpp17_randacc_iterator<_Iter>
431 {
using type = random_access_iterator_tag; };
433 template<
typename _Iter>
434 requires __detail::__iter_without_category<_Iter>
435 && __detail::__cpp17_bidi_iterator<_Iter>
437 {
using type = bidirectional_iterator_tag; };
439 template<
typename _Iter>
440 requires __detail::__iter_without_category<_Iter>
441 && __detail::__cpp17_fwd_iterator<_Iter>
443 {
using type = forward_iterator_tag; };
445 template<
typename _Iter>
447 {
using type = void; };
449 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
451 {
using type =
typename _Iter::pointer; };
453 template<
typename _Iter>
454 requires (!
requires {
typename _Iter::pointer; }
455 &&
requires(_Iter& __it) { __it.operator->(); })
459 template<
typename _Iter>
461 {
using type = iter_reference_t<_Iter>; };
463 template<
typename _Iter>
requires requires {
typename _Iter::reference; }
465 {
using type =
typename _Iter::reference; };
468 using iterator_category =
typename __cat<_Iterator>::type;
470 =
typename indirectly_readable_traits<_Iterator>::value_type;
471 using difference_type
472 =
typename incrementable_traits<_Iterator>::difference_type;
473 using pointer =
typename __ptr<_Iterator>::type;
474 using reference =
typename __ref<_Iterator>::type;
477 template<
typename _Iterator>
478 requires __detail::__iter_without_nested_types<_Iterator>
479 && __detail::__cpp17_iterator<_Iterator>
480 struct __iterator_traits<_Iterator, void>
483 template<
typename _Iter>
485 {
using type = void; };
487 template<
typename _Iter>
489 {
typename incrementable_traits<_Iter>::difference_type; }
492 using type =
typename incrementable_traits<_Iter>::difference_type;
496 using iterator_category = output_iterator_tag;
497 using value_type = void;
498 using difference_type =
typename __diff<_Iterator>::type;
499 using pointer = void;
500 using reference = void;
505 template<
typename _Iter>
506 struct __iter_concept_impl;
509 template<
typename _Iter>
510 requires requires {
typename __iter_traits<_Iter>::iterator_concept; }
511 struct __iter_concept_impl<_Iter>
512 {
using type =
typename __iter_traits<_Iter>::iterator_concept; };
515 template<
typename _Iter>
516 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
517 &&
requires {
typename __iter_traits<_Iter>::iterator_category; })
518 struct __iter_concept_impl<_Iter>
519 {
using type =
typename __iter_traits<_Iter>::iterator_category; };
522 template<
typename _Iter>
523 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
524 && !
requires {
typename __iter_traits<_Iter>::iterator_category; }
525 && __primary_traits_iter<_Iter>)
526 struct __iter_concept_impl<_Iter>
527 {
using type = random_access_iterator_tag; };
530 template<
typename _Iter>
531 struct __iter_concept_impl
535 template<
typename _Iter>
536 using __iter_concept =
typename __iter_concept_impl<_Iter>::type;
538 template<
typename _In>
539 concept __indirectly_readable_impl =
requires
541 typename iter_value_t<_In>;
542 typename iter_reference_t<_In>;
543 typename iter_rvalue_reference_t<_In>;
544 requires same_as<iter_reference_t<const _In>,
545 iter_reference_t<_In>>;
546 requires same_as<iter_rvalue_reference_t<const _In>,
547 iter_rvalue_reference_t<_In>>;
549 && common_reference_with<iter_reference_t<_In>&&, iter_value_t<_In>&>
550 && common_reference_with<iter_reference_t<_In>&&,
551 iter_rvalue_reference_t<_In>&&>
552 && common_reference_with<iter_rvalue_reference_t<_In>&&,
553 const iter_value_t<_In>&>;
558 template<
typename _In>
559 concept indirectly_readable
560 = __detail::__indirectly_readable_impl<remove_cvref_t<_In>>;
564 template<
typename _Tp>
565 struct __indirect_value
566 {
using type = iter_value_t<_Tp>&; };
571 template<
typename _Tp>
572 using __indirect_value_t =
typename __detail::__indirect_value<_Tp>::type;
574 template<indirectly_readable _Tp>
575 using iter_common_reference_t
579 template<
typename _Out,
typename _Tp>
580 concept indirectly_writable =
requires(_Out&& __o, _Tp&& __t)
584 const_cast<const iter_reference_t<_Out>&&
>(*__o)
590 namespace ranges::__detail
592 class __max_diff_type;
593 class __max_size_type;
596 template<
typename _Tp>
597 concept __is_signed_int128
599 = same_as<_Tp, __int128>;
605 template<
typename _Tp>
606 concept __is_unsigned_int128
608 = same_as<_Tp, unsigned __int128>;
613 template<
typename _Tp>
614 concept __cv_bool = same_as<const volatile _Tp, const volatile bool>;
616 template<
typename _Tp>
617 concept __integral_nonbool = integral<_Tp> && !__cv_bool<_Tp>;
619 template<
typename _Tp>
620 concept __is_int128 = __is_signed_int128<_Tp> || __is_unsigned_int128<_Tp>;
622 template<
typename _Tp>
623 concept __is_integer_like = __integral_nonbool<_Tp>
625 || same_as<_Tp, __max_diff_type> || same_as<_Tp, __max_size_type>;
627 template<
typename _Tp>
628 concept __is_signed_integer_like = signed_integral<_Tp>
629 || __is_signed_int128<_Tp>
630 || same_as<_Tp, __max_diff_type>;
634 namespace __detail {
using ranges::__detail::__is_signed_integer_like; }
637 template<
typename _Iter>
638 concept weakly_incrementable = movable<_Iter>
639 &&
requires(_Iter __i)
641 typename iter_difference_t<_Iter>;
642 requires __detail::__is_signed_integer_like<iter_difference_t<_Iter>>;
643 { ++__i } -> same_as<_Iter&>;
647 template<
typename _Iter>
648 concept incrementable = regular<_Iter> && weakly_incrementable<_Iter>
649 &&
requires(_Iter __i) { { __i++ } -> same_as<_Iter>; };
651 template<
typename _Iter>
652 concept input_or_output_iterator
653 =
requires(_Iter __i) { { *__i } -> __detail::__can_reference; }
654 && weakly_incrementable<_Iter>;
656 template<
typename _Sent,
typename _Iter>
657 concept sentinel_for = semiregular<_Sent>
658 && input_or_output_iterator<_Iter>
659 && __detail::__weakly_eq_cmp_with<_Sent, _Iter>;
661 template<
typename _Sent,
typename _Iter>
662 inline constexpr bool disable_sized_sentinel_for =
false;
664 template<
typename _Sent,
typename _Iter>
665 concept sized_sentinel_for = sentinel_for<_Sent, _Iter>
666 && !disable_sized_sentinel_for<remove_cv_t<_Sent>, remove_cv_t<_Iter>>
667 &&
requires(
const _Iter& __i,
const _Sent& __s)
669 { __s - __i } -> same_as<iter_difference_t<_Iter>>;
670 { __i - __s } -> same_as<iter_difference_t<_Iter>>;
673 template<
typename _Iter>
674 concept input_iterator = input_or_output_iterator<_Iter>
675 && indirectly_readable<_Iter>
676 &&
requires {
typename __detail::__iter_concept<_Iter>; }
677 && derived_from<__detail::__iter_concept<_Iter>, input_iterator_tag>;
679 template<
typename _Iter,
typename _Tp>
680 concept output_iterator = input_or_output_iterator<_Iter>
681 && indirectly_writable<_Iter, _Tp>
684 template<
typename _Iter>
685 concept forward_iterator = input_iterator<_Iter>
686 && derived_from<__detail::__iter_concept<_Iter>, forward_iterator_tag>
687 && incrementable<_Iter> && sentinel_for<_Iter, _Iter>;
689 template<
typename _Iter>
690 concept bidirectional_iterator = forward_iterator<_Iter>
691 && derived_from<__detail::__iter_concept<_Iter>,
692 bidirectional_iterator_tag>
693 &&
requires(_Iter __i)
695 { --__i } -> same_as<_Iter&>;
696 { __i-- } -> same_as<_Iter>;
699 template<
typename _Iter>
700 concept random_access_iterator = bidirectional_iterator<_Iter>
701 && derived_from<__detail::__iter_concept<_Iter>,
702 random_access_iterator_tag>
703 && totally_ordered<_Iter> && sized_sentinel_for<_Iter, _Iter>
704 &&
requires(_Iter __i,
const _Iter __j,
705 const iter_difference_t<_Iter> __n)
707 { __i += __n } -> same_as<_Iter&>;
708 { __j + __n } -> same_as<_Iter>;
709 { __n + __j } -> same_as<_Iter>;
710 { __i -= __n } -> same_as<_Iter&>;
711 { __j - __n } -> same_as<_Iter>;
712 { __j[__n] } -> same_as<iter_reference_t<_Iter>>;
715 template<
typename _Iter>
716 concept contiguous_iterator = random_access_iterator<_Iter>
717 && derived_from<__detail::__iter_concept<_Iter>, contiguous_iterator_tag>
718 && is_lvalue_reference_v<iter_reference_t<_Iter>>
719 && same_as<iter_value_t<_Iter>, remove_cvref_t<iter_reference_t<_Iter>>>
720 &&
requires(
const _Iter& __i)
723 -> same_as<add_pointer_t<iter_reference_t<_Iter>>>;
730 template<
typename _Fn,
typename _Iter>
731 concept indirectly_unary_invocable = indirectly_readable<_Iter>
732 && copy_constructible<_Fn> && invocable<_Fn&, __indirect_value_t<_Iter>>
733 && invocable<_Fn&, iter_reference_t<_Iter>>
734 && common_reference_with<invoke_result_t<_Fn&, __indirect_value_t<_Iter>>,
735 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
737 template<
typename _Fn,
typename _Iter>
738 concept indirectly_regular_unary_invocable = indirectly_readable<_Iter>
739 && copy_constructible<_Fn>
740 && regular_invocable<_Fn&, __indirect_value_t<_Iter>>
741 && regular_invocable<_Fn&, iter_reference_t<_Iter>>
742 && common_reference_with<invoke_result_t<_Fn&, __indirect_value_t<_Iter>>,
743 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
745 template<
typename _Fn,
typename _Iter>
746 concept indirect_unary_predicate = indirectly_readable<_Iter>
747 && copy_constructible<_Fn> && predicate<_Fn&, __indirect_value_t<_Iter>>
748 && predicate<_Fn&, iter_reference_t<_Iter>>;
750 template<
typename _Fn,
typename _I1,
typename _I2>
751 concept indirect_binary_predicate
752 = indirectly_readable<_I1> && indirectly_readable<_I2>
753 && copy_constructible<_Fn>
754 && predicate<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
755 && predicate<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
756 && predicate<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
757 && predicate<_Fn&, iter_reference_t<_I1>, iter_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&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
764 && equivalence_relation<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
765 && equivalence_relation<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
766 && equivalence_relation<_Fn&, iter_reference_t<_I1>,
767 iter_reference_t<_I2>>;
769 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
770 concept indirect_strict_weak_order
771 = indirectly_readable<_I1> && indirectly_readable<_I2>
772 && copy_constructible<_Fn>
773 && strict_weak_order<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
774 && strict_weak_order<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
775 && strict_weak_order<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
776 && strict_weak_order<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>;
778 template<
typename _Fn,
typename... _Is>
779 requires (indirectly_readable<_Is> && ...)
780 && invocable<_Fn, iter_reference_t<_Is>...>
781 using indirect_result_t = invoke_result_t<_Fn, iter_reference_t<_Is>...>;
785 template<
typename _Iter,
typename _Proj>
790 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
791 indirect_result_t<_Proj&, _Iter>
operator*()
const;
795 using __projected_Iter = _Iter;
796 using __projected_Proj = _Proj;
800 template<weakly_incrementable _Iter,
typename _Proj>
801 struct __projected<_Iter, _Proj>
805 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
806 using difference_type = iter_difference_t<_Iter>;
807 indirect_result_t<_Proj&, _Iter>
operator*()
const;
809 using __projected_Iter = _Iter;
810 using __projected_Proj = _Proj;
815 template<
typename _Iter>
816 struct __projected<_Iter, identity>
817 {
using __type = _Iter; };
821 template<indirectly_readable _Iter,
822 indirectly_regular_unary_invocable<_Iter> _Proj>
823 using projected =
typename __detail::__projected<_Iter, _Proj>::__type;
826 template<
typename _Tp>
827 requires same_as<_Tp, projected<
typename _Tp::__projected_Iter,
828 typename _Tp::__projected_Proj>>
829 struct __detail::__indirect_value<_Tp>
831 using _Iter =
typename _Tp::__projected_Iter;
832 using _Proj =
typename _Tp::__projected_Proj;
833 using type = invoke_result_t<_Proj&, __indirect_value_t<_Iter>>;
836#if __glibcxx_algorithm_default_value_type
837 template<indirectly_readable _Iter,
838 indirectly_regular_unary_invocable<_Iter> _Proj>
839 using projected_value_t
840 = remove_cvref_t<invoke_result_t<_Proj&, iter_value_t<_Iter>&>>;
847 template<
typename _In,
typename _Out>
848 concept indirectly_movable = indirectly_readable<_In>
849 && indirectly_writable<_Out, iter_rvalue_reference_t<_In>>;
851 template<
typename _In,
typename _Out>
852 concept indirectly_movable_storable = indirectly_movable<_In, _Out>
853 && indirectly_writable<_Out, iter_value_t<_In>>
854 && movable<iter_value_t<_In>>
855 && constructible_from<iter_value_t<_In>, iter_rvalue_reference_t<_In>>
856 && assignable_from<iter_value_t<_In>&, iter_rvalue_reference_t<_In>>;
859 template<
typename _In,
typename _Out>
860 concept indirectly_copyable = indirectly_readable<_In>
861 && indirectly_writable<_Out, iter_reference_t<_In>>;
863 template<
typename _In,
typename _Out>
864 concept indirectly_copyable_storable = indirectly_copyable<_In, _Out>
865 && indirectly_writable<_Out, iter_value_t<_In>&>
866 && indirectly_writable<_Out, const iter_value_t<_In>&>
867 && indirectly_writable<_Out, iter_value_t<_In>&&>
868 && indirectly_writable<_Out, const iter_value_t<_In>&&>
869 && copyable<iter_value_t<_In>>
870 && constructible_from<iter_value_t<_In>, iter_reference_t<_In>>
871 && assignable_from<iter_value_t<_In>&, iter_reference_t<_In>>;
878 template<
typename _It1,
typename _It2>
879 void iter_swap(_It1, _It2) =
delete;
881 template<
typename _Tp,
typename _Up>
883 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>
884 || std::__detail::__class_or_enum<remove_reference_t<_Up>>)
885 &&
requires(_Tp&& __t, _Up&& __u) {
886 iter_swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
889 template<
typename _Xp,
typename _Yp>
890 constexpr iter_value_t<_Xp>
891 __iter_exchange_move(_Xp&& __x, _Yp&& __y)
892 noexcept(
noexcept(iter_value_t<_Xp>(iter_move(__x)))
893 &&
noexcept(*__x = iter_move(__y)))
895 iter_value_t<_Xp> __old_value(iter_move(__x));
896 *__x = iter_move(__y);
903 template<
typename _Tp,
typename _Up>
904 static constexpr bool
907 if constexpr (__adl_iswap<_Tp, _Up>)
910 else if constexpr (indirectly_readable<_Tp>
911 && indirectly_readable<_Up>
912 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
922 template<
typename _Tp,
typename _Up>
923 requires __adl_iswap<_Tp, _Up>
924 || (indirectly_readable<remove_reference_t<_Tp>>
925 && indirectly_readable<remove_reference_t<_Up>>
926 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
927 || (indirectly_movable_storable<_Tp, _Up>
928 && indirectly_movable_storable<_Up, _Tp>)
930 operator()(_Tp&& __e1, _Up&& __e2)
const
931 noexcept(_S_noexcept<_Tp, _Up>())
933 if constexpr (__adl_iswap<_Tp, _Up>)
934 iter_swap(
static_cast<_Tp&&
>(__e1),
static_cast<_Up&&
>(__e2));
935 else if constexpr (indirectly_readable<_Tp>
936 && indirectly_readable<_Up>
937 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
938 ranges::swap(*__e1, *__e2);
940 *__e1 = __iswap::__iter_exchange_move(__e2, __e1);
946 inline namespace _Cpo {
947 inline constexpr __iswap::_IterSwap iter_swap{};
953 template<
typename _I1,
typename _I2 = _I1>
954 concept indirectly_swappable
955 = indirectly_readable<_I1> && indirectly_readable<_I2>
956 &&
requires(
const _I1 __i1,
const _I2 __i2)
958 ranges::iter_swap(__i1, __i1);
959 ranges::iter_swap(__i2, __i2);
960 ranges::iter_swap(__i1, __i2);
961 ranges::iter_swap(__i2, __i1);
965 template<
typename _I1,
typename _I2,
typename _Rel,
typename _P1 = identity,
966 typename _P2 = identity>
967 concept indirectly_comparable
968 = indirect_binary_predicate<_Rel, projected<_I1, _P1>,
969 projected<_I2, _P2>>;
972 template<
typename _Iter>
973 concept permutable = forward_iterator<_Iter>
974 && indirectly_movable_storable<_Iter, _Iter>
975 && indirectly_swappable<_Iter, _Iter>;
978 template<
typename _I1,
typename _I2,
typename _Out,
979 typename _Rel = ranges::less,
typename _P1 = identity,
980 typename _P2 = identity>
981 concept mergeable = input_iterator<_I1> && input_iterator<_I2>
982 && weakly_incrementable<_Out> && indirectly_copyable<_I1, _Out>
983 && indirectly_copyable<_I2, _Out>
984 && indirect_strict_weak_order<_Rel, projected<_I1, _P1>,
985 projected<_I2, _P2>>;
988 template<
typename _Iter,
typename _Rel = ranges::less,
989 typename _Proj = identity>
990 concept sortable = permutable<_Iter>
991 && indirect_strict_weak_order<_Rel, projected<_Iter, _Proj>>;
993 struct unreachable_sentinel_t
995 template<weakly_incrementable _It>
996 friend constexpr bool
997 operator==(unreachable_sentinel_t,
const _It&)
noexcept
1001 inline constexpr unreachable_sentinel_t unreachable_sentinel{};
1004 namespace ranges::__access
1006 using std::__detail::__class_or_enum;
1008 struct _Decay_copy final
1010 template<
typename _Tp>
1011 constexpr decay_t<_Tp>
1012 operator()(_Tp&& __t)
const
1013 noexcept(is_nothrow_convertible_v<_Tp, decay_t<_Tp>>)
1015 }
inline constexpr __decay_copy{};
1017 template<
typename _Tp>
1018 concept __member_begin =
requires(_Tp& __t)
1020 { __decay_copy(__t.begin()) } -> input_or_output_iterator;
1024 void begin() =
delete;
1026 template<
typename _Tp>
1027 concept __adl_begin = __class_or_enum<remove_reference_t<_Tp>>
1028 &&
requires(_Tp& __t)
1030 { __decay_copy(
begin(__t)) } -> input_or_output_iterator;
1035 template<
typename _Tp>
1036 requires is_array_v<_Tp> || __member_begin<_Tp&> || __adl_begin<_Tp&>
1040 if constexpr (is_array_v<_Tp>)
1042 else if constexpr (__member_begin<_Tp&>)
1052 template<
typename _Tp>
1053 using __range_iter_t
1059_GLIBCXX_END_NAMESPACE_VERSION
1061#pragma GCC diagnostic pop
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 _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.