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>
109 void iter_move() =
delete;
113 template<
typename _Tp>
115 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>)
116 &&
requires(_Tp&& __t) { iter_move(
static_cast<_Tp&&
>(__t)); };
123 template<
typename _Tp>
126 template<
typename _Tp>
128 {
using type = __iter_ref_t<_Tp>; };
131 template<
typename _Tp>
132 requires __adl_imove<_Tp>
137 template<
typename _Tp>
138 requires (!__adl_imove<_Tp>)
139 && is_lvalue_reference_v<__iter_ref_t<_Tp>>
141 {
using type = remove_reference_t<__iter_ref_t<_Tp>>&&; };
143 template<
typename _Tp>
144 static constexpr bool
147 if constexpr (__adl_imove<_Tp>)
155 template<
typename _Tp>
156 using __type =
typename __result<_Tp>::type;
158 template<
typename _Tp>
159 requires __adl_imove<_Tp> ||
requires {
typename __iter_ref_t<_Tp>; }
161 constexpr __type<_Tp>
162 operator()(_Tp&& __e)
const
163 noexcept(_S_noexcept<_Tp>())
165 if constexpr (__adl_imove<_Tp>)
166 return iter_move(
static_cast<_Tp&&
>(__e));
167 else if constexpr (is_lvalue_reference_v<__iter_ref_t<_Tp>>)
168 return std::move(*
static_cast<_Tp&&
>(__e));
170 return *
static_cast<_Tp&&
>(__e);
176 inline namespace _Cpo {
177 inline constexpr __imove::_IterMove iter_move{};
182 template<__detail::__dereferenceable _Tp>
183 requires __detail::__can_reference<ranges::__imove::_IterMove::__type<_Tp&>>
184 using iter_rvalue_reference_t = ranges::__imove::_IterMove::__type<_Tp&>;
186 template<
typename>
struct incrementable_traits { };
188 template<
typename _Tp>
requires is_object_v<_Tp>
189 struct incrementable_traits<_Tp*>
192 template<
typename _Iter>
193 struct incrementable_traits<const _Iter>
194 : incrementable_traits<_Iter> { };
196 template<
typename _Tp>
requires requires {
typename _Tp::difference_type; }
197 struct incrementable_traits<_Tp>
198 {
using difference_type =
typename _Tp::difference_type; };
200 template<
typename _Tp>
201 requires (!
requires {
typename _Tp::difference_type; }
202 &&
requires(
const _Tp& __a,
const _Tp& __b)
203 { { __a - __b } -> integral; })
204 struct incrementable_traits<_Tp>
210#if defined __STRICT_ANSI__ && defined __SIZEOF_INT128__
213 struct incrementable_traits<__int128>
214 {
using difference_type = __int128; };
217 struct incrementable_traits<unsigned __int128>
218 {
using difference_type = __int128; };
225 template<
typename _Iter>
226 concept __primary_traits_iter
227 = __is_base_of(__iterator_traits<_Iter, void>, iterator_traits<_Iter>);
229 template<
typename _Iter,
typename _Tp>
230 struct __iter_traits_impl
231 {
using type = iterator_traits<_Iter>; };
233 template<
typename _Iter,
typename _Tp>
234 requires __primary_traits_iter<_Iter>
235 struct __iter_traits_impl<_Iter, _Tp>
236 {
using type = _Tp; };
239 template<
typename _Iter,
typename _Tp = _Iter>
240 using __iter_traits =
typename __iter_traits_impl<_Iter, _Tp>::type;
242 template<
typename _Tp>
243 using __iter_diff_t =
typename
244 __iter_traits<_Tp, incrementable_traits<_Tp>>::difference_type;
247 template<
typename _Tp>
248 using iter_difference_t = __detail::__iter_diff_t<remove_cvref_t<_Tp>>;
252 template<
typename>
struct __cond_value_type { };
254 template<
typename _Tp>
requires is_object_v<_Tp>
255 struct __cond_value_type<_Tp>
256 {
using value_type = remove_cv_t<_Tp>; };
258 template<
typename _Tp>
259 concept __has_member_value_type
260 =
requires {
typename _Tp::value_type; };
262 template<
typename _Tp>
263 concept __has_member_element_type
264 =
requires {
typename _Tp::element_type; };
268 template<
typename>
struct indirectly_readable_traits { };
270 template<
typename _Tp>
271 struct indirectly_readable_traits<_Tp*>
272 : __detail::__cond_value_type<_Tp>
275 template<
typename _Iter>
requires is_array_v<_Iter>
276 struct indirectly_readable_traits<_Iter>
277 {
using value_type = remove_cv_t<remove_extent_t<_Iter>>; };
279 template<
typename _Iter>
280 struct indirectly_readable_traits<const _Iter>
281 : indirectly_readable_traits<_Iter>
284 template<__detail::__has_member_value_type _Tp>
285 struct indirectly_readable_traits<_Tp>
286 : __detail::__cond_value_type<typename _Tp::value_type>
289 template<__detail::__has_member_element_type _Tp>
290 struct indirectly_readable_traits<_Tp>
291 : __detail::__cond_value_type<typename _Tp::element_type>
296 template<__detail::__has_member_value_type _Tp>
297 requires __detail::__has_member_element_type<_Tp>
298 && same_as<remove_cv_t<typename _Tp::element_type>,
299 remove_cv_t<typename _Tp::value_type>>
300 struct indirectly_readable_traits<_Tp>
301 : __detail::__cond_value_type<typename _Tp::value_type>
306 template<__detail::__has_member_value_type _Tp>
307 requires __detail::__has_member_element_type<_Tp>
308 struct indirectly_readable_traits<_Tp>
313 template<
typename _Tp>
314 using __iter_value_t =
typename
315 __iter_traits<_Tp, indirectly_readable_traits<_Tp>>::value_type;
318 template<
typename _Tp>
319 using iter_value_t = __detail::__iter_value_t<remove_cvref_t<_Tp>>;
325 template<
typename _Iter>
326 concept __cpp17_iterator =
requires(_Iter __it)
328 { *__it } -> __can_reference;
329 { ++__it } -> same_as<_Iter&>;
330 { *__it++ } -> __can_reference;
331 } && copyable<_Iter>;
333 template<
typename _Iter>
334 concept __cpp17_input_iterator = __cpp17_iterator<_Iter>
335 && equality_comparable<_Iter>
336 &&
requires(_Iter __it)
338 typename incrementable_traits<_Iter>::difference_type;
339 typename indirectly_readable_traits<_Iter>::value_type;
341 typename indirectly_readable_traits<_Iter>::value_type&>;
343 typename indirectly_readable_traits<_Iter>::value_type&>;
344 requires signed_integral<
345 typename incrementable_traits<_Iter>::difference_type>;
350 template<
typename _Iter>
351 concept __cpp17_fwd_iterator = __cpp17_input_iterator<_Iter>
352 && constructible_from<_Iter>
353 && is_reference_v<iter_reference_t<_Iter>>
354 && same_as<remove_cvref_t<iter_reference_t<_Iter>>,
355 typename indirectly_readable_traits<_Iter>::value_type>
356 &&
requires(_Iter __it)
358 { __it++ } -> convertible_to<const _Iter&>;
359 { *__it++ } -> same_as<iter_reference_t<_Iter>>;
362 template<
typename _Iter>
363 concept __cpp17_bidi_iterator = __cpp17_fwd_iterator<_Iter>
364 &&
requires(_Iter __it)
366 { --__it } -> same_as<_Iter&>;
367 { __it-- } -> convertible_to<const _Iter&>;
368 { *__it-- } -> same_as<iter_reference_t<_Iter>>;
371 template<
typename _Iter>
372 concept __cpp17_randacc_iterator = __cpp17_bidi_iterator<_Iter>
373 && totally_ordered<_Iter>
374 &&
requires(_Iter __it,
375 typename incrementable_traits<_Iter>::difference_type __n)
377 { __it += __n } -> same_as<_Iter&>;
378 { __it -= __n } -> same_as<_Iter&>;
379 { __it + __n } -> same_as<_Iter>;
380 { __n + __it } -> same_as<_Iter>;
381 { __it - __n } -> same_as<_Iter>;
382 { __it - __it } -> same_as<
decltype(__n)>;
383 { __it[__n] } -> convertible_to<iter_reference_t<_Iter>>;
386 template<
typename _Iter>
387 concept __iter_with_nested_types =
requires {
388 typename _Iter::iterator_category;
389 typename _Iter::value_type;
390 typename _Iter::difference_type;
391 typename _Iter::reference;
394 template<
typename _Iter>
395 concept __iter_without_nested_types = !__iter_with_nested_types<_Iter>;
397 template<
typename _Iter>
398 concept __iter_without_category
399 = !
requires {
typename _Iter::iterator_category; };
403 template<
typename _Iterator>
404 requires __detail::__iter_with_nested_types<_Iterator>
405 struct __iterator_traits<_Iterator, void>
408 template<
typename _Iter>
410 {
using type = void; };
412 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
414 {
using type =
typename _Iter::pointer; };
417 using iterator_category =
typename _Iterator::iterator_category;
418 using value_type =
typename _Iterator::value_type;
419 using difference_type =
typename _Iterator::difference_type;
420 using pointer =
typename __ptr<_Iterator>::type;
421 using reference =
typename _Iterator::reference;
424 template<
typename _Iterator>
425 requires __detail::__iter_without_nested_types<_Iterator>
426 && __detail::__cpp17_input_iterator<_Iterator>
427 struct __iterator_traits<_Iterator, void>
430 template<
typename _Iter>
432 {
using type = input_iterator_tag; };
434 template<
typename _Iter>
435 requires requires {
typename _Iter::iterator_category; }
437 {
using type =
typename _Iter::iterator_category; };
439 template<
typename _Iter>
440 requires __detail::__iter_without_category<_Iter>
441 && __detail::__cpp17_randacc_iterator<_Iter>
443 {
using type = random_access_iterator_tag; };
445 template<
typename _Iter>
446 requires __detail::__iter_without_category<_Iter>
447 && __detail::__cpp17_bidi_iterator<_Iter>
449 {
using type = bidirectional_iterator_tag; };
451 template<
typename _Iter>
452 requires __detail::__iter_without_category<_Iter>
453 && __detail::__cpp17_fwd_iterator<_Iter>
455 {
using type = forward_iterator_tag; };
457 template<
typename _Iter>
459 {
using type = void; };
461 template<
typename _Iter>
requires requires {
typename _Iter::pointer; }
463 {
using type =
typename _Iter::pointer; };
465 template<
typename _Iter>
466 requires (!
requires {
typename _Iter::pointer; }
467 &&
requires(_Iter& __it) { __it.operator->(); })
471 template<
typename _Iter>
473 {
using type = iter_reference_t<_Iter>; };
475 template<
typename _Iter>
requires requires {
typename _Iter::reference; }
477 {
using type =
typename _Iter::reference; };
480 using iterator_category =
typename __cat<_Iterator>::type;
482 =
typename indirectly_readable_traits<_Iterator>::value_type;
483 using difference_type
484 =
typename incrementable_traits<_Iterator>::difference_type;
485 using pointer =
typename __ptr<_Iterator>::type;
486 using reference =
typename __ref<_Iterator>::type;
489 template<
typename _Iterator>
490 requires __detail::__iter_without_nested_types<_Iterator>
491 && __detail::__cpp17_iterator<_Iterator>
492 struct __iterator_traits<_Iterator, void>
495 template<
typename _Iter>
497 {
using type = void; };
499 template<
typename _Iter>
501 {
typename incrementable_traits<_Iter>::difference_type; }
504 using type =
typename incrementable_traits<_Iter>::difference_type;
508 using iterator_category = output_iterator_tag;
509 using value_type = void;
510 using difference_type =
typename __diff<_Iterator>::type;
511 using pointer = void;
512 using reference = void;
517 template<
typename _Iter>
518 struct __iter_concept_impl;
521 template<
typename _Iter>
522 requires requires {
typename __iter_traits<_Iter>::iterator_concept; }
523 struct __iter_concept_impl<_Iter>
524 {
using type =
typename __iter_traits<_Iter>::iterator_concept; };
527 template<
typename _Iter>
528 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
529 &&
requires {
typename __iter_traits<_Iter>::iterator_category; })
530 struct __iter_concept_impl<_Iter>
531 {
using type =
typename __iter_traits<_Iter>::iterator_category; };
534 template<
typename _Iter>
535 requires (!
requires {
typename __iter_traits<_Iter>::iterator_concept; }
536 && !
requires {
typename __iter_traits<_Iter>::iterator_category; }
537 && __primary_traits_iter<_Iter>)
538 struct __iter_concept_impl<_Iter>
539 {
using type = random_access_iterator_tag; };
542 template<
typename _Iter>
543 struct __iter_concept_impl
547 template<
typename _Iter>
548 using __iter_concept =
typename __iter_concept_impl<_Iter>::type;
550 template<
typename _In>
551 concept __indirectly_readable_impl =
requires
553 typename iter_value_t<_In>;
554 typename iter_reference_t<_In>;
555 typename iter_rvalue_reference_t<_In>;
556 requires same_as<iter_reference_t<const _In>,
557 iter_reference_t<_In>>;
558 requires same_as<iter_rvalue_reference_t<const _In>,
559 iter_rvalue_reference_t<_In>>;
561 && common_reference_with<iter_reference_t<_In>&&, iter_value_t<_In>&>
562 && common_reference_with<iter_reference_t<_In>&&,
563 iter_rvalue_reference_t<_In>&&>
564 && common_reference_with<iter_rvalue_reference_t<_In>&&,
565 const iter_value_t<_In>&>;
570 template<
typename _In>
571 concept indirectly_readable
572 = __detail::__indirectly_readable_impl<remove_cvref_t<_In>>;
576 template<
typename _Tp>
577 struct __indirect_value
578 {
using type = iter_value_t<_Tp>&; };
583 template<
typename _Tp>
584 using __indirect_value_t =
typename __detail::__indirect_value<_Tp>::type;
586 template<indirectly_readable _Tp>
587 using iter_common_reference_t
591 template<
typename _Out,
typename _Tp>
592 concept indirectly_writable =
requires(_Out&& __o, _Tp&& __t)
596 const_cast<const iter_reference_t<_Out>&&
>(*__o)
602 namespace ranges::__detail
604 class __max_diff_type;
605 class __max_size_type;
608 template<
typename _Tp>
609 concept __is_signed_int128
611 = same_as<_Tp, __int128>;
617 template<
typename _Tp>
618 concept __is_unsigned_int128
620 = same_as<_Tp, unsigned __int128>;
625 template<
typename _Tp>
626 concept __cv_bool = same_as<const volatile _Tp, const volatile bool>;
628 template<
typename _Tp>
629 concept __integral_nonbool = integral<_Tp> && !__cv_bool<_Tp>;
631 template<
typename _Tp>
632 concept __is_int128 = __is_signed_int128<_Tp> || __is_unsigned_int128<_Tp>;
634 template<
typename _Tp>
635 concept __is_integer_like = __integral_nonbool<_Tp>
637 || same_as<_Tp, __max_diff_type> || same_as<_Tp, __max_size_type>;
639 template<
typename _Tp>
640 concept __is_signed_integer_like = signed_integral<_Tp>
641 || __is_signed_int128<_Tp>
642 || same_as<_Tp, __max_diff_type>;
646 namespace __detail {
using ranges::__detail::__is_signed_integer_like; }
649 template<
typename _Iter>
650 concept weakly_incrementable = movable<_Iter>
651 &&
requires(_Iter __i)
653 typename iter_difference_t<_Iter>;
654 requires __detail::__is_signed_integer_like<iter_difference_t<_Iter>>;
655 { ++__i } -> same_as<_Iter&>;
659 template<
typename _Iter>
660 concept incrementable = regular<_Iter> && weakly_incrementable<_Iter>
661 &&
requires(_Iter __i) { { __i++ } -> same_as<_Iter>; };
663 template<
typename _Iter>
664 concept input_or_output_iterator
665 =
requires(_Iter __i) { { *__i } -> __detail::__can_reference; }
666 && weakly_incrementable<_Iter>;
668 template<
typename _Sent,
typename _Iter>
669 concept sentinel_for = semiregular<_Sent>
670 && input_or_output_iterator<_Iter>
671 && __detail::__weakly_eq_cmp_with<_Sent, _Iter>;
673 template<
typename _Sent,
typename _Iter>
674 inline constexpr bool disable_sized_sentinel_for =
false;
676 template<
typename _Sent,
typename _Iter>
677 concept sized_sentinel_for = sentinel_for<_Sent, _Iter>
678 && !disable_sized_sentinel_for<remove_cv_t<_Sent>, remove_cv_t<_Iter>>
679 &&
requires(
const _Iter& __i,
const _Sent& __s)
681 { __s - __i } -> same_as<iter_difference_t<_Iter>>;
682 { __i - __s } -> same_as<iter_difference_t<_Iter>>;
685 template<
typename _Iter>
686 concept input_iterator = input_or_output_iterator<_Iter>
687 && indirectly_readable<_Iter>
688 &&
requires {
typename __detail::__iter_concept<_Iter>; }
691 template<
typename _Iter,
typename _Tp>
692 concept output_iterator = input_or_output_iterator<_Iter>
693 && indirectly_writable<_Iter, _Tp>
696 template<
typename _Iter>
697 concept forward_iterator = input_iterator<_Iter>
699 && incrementable<_Iter> && sentinel_for<_Iter, _Iter>;
701 template<
typename _Iter>
702 concept bidirectional_iterator = forward_iterator<_Iter>
703 && derived_from<__detail::__iter_concept<_Iter>,
705 &&
requires(_Iter __i)
707 { --__i } -> same_as<_Iter&>;
708 { __i-- } -> same_as<_Iter>;
711 template<
typename _Iter>
712 concept random_access_iterator = bidirectional_iterator<_Iter>
713 && derived_from<__detail::__iter_concept<_Iter>,
715 && totally_ordered<_Iter> && sized_sentinel_for<_Iter, _Iter>
716 &&
requires(_Iter __i,
const _Iter __j,
717 const iter_difference_t<_Iter> __n)
719 { __i += __n } -> same_as<_Iter&>;
720 { __j + __n } -> same_as<_Iter>;
721 { __n + __j } -> same_as<_Iter>;
722 { __i -= __n } -> same_as<_Iter&>;
723 { __j - __n } -> same_as<_Iter>;
724 { __j[__n] } -> same_as<iter_reference_t<_Iter>>;
727 template<
typename _Iter>
728 concept contiguous_iterator = random_access_iterator<_Iter>
730 && is_lvalue_reference_v<iter_reference_t<_Iter>>
731 && same_as<iter_value_t<_Iter>, remove_cvref_t<iter_reference_t<_Iter>>>
732 &&
requires(
const _Iter& __i)
735 -> same_as<add_pointer_t<iter_reference_t<_Iter>>>;
742 template<
typename _Fn,
typename _Iter>
743 concept indirectly_unary_invocable = indirectly_readable<_Iter>
744 && copy_constructible<_Fn> && invocable<_Fn&, __indirect_value_t<_Iter>>
745 && invocable<_Fn&, iter_reference_t<_Iter>>
746 && common_reference_with<invoke_result_t<_Fn&, __indirect_value_t<_Iter>>,
747 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
749 template<
typename _Fn,
typename _Iter>
750 concept indirectly_regular_unary_invocable = indirectly_readable<_Iter>
751 && copy_constructible<_Fn>
752 && regular_invocable<_Fn&, __indirect_value_t<_Iter>>
753 && regular_invocable<_Fn&, iter_reference_t<_Iter>>
754 && common_reference_with<invoke_result_t<_Fn&, __indirect_value_t<_Iter>>,
755 invoke_result_t<_Fn&, iter_reference_t<_Iter>>>;
757 template<
typename _Fn,
typename _Iter>
758 concept indirect_unary_predicate = indirectly_readable<_Iter>
759 && copy_constructible<_Fn> && predicate<_Fn&, __indirect_value_t<_Iter>>
760 && predicate<_Fn&, iter_reference_t<_Iter>>;
762 template<
typename _Fn,
typename _I1,
typename _I2>
763 concept indirect_binary_predicate
764 = indirectly_readable<_I1> && indirectly_readable<_I2>
765 && copy_constructible<_Fn>
766 && predicate<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
767 && predicate<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
768 && predicate<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
769 && predicate<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>;
771 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
772 concept indirect_equivalence_relation
773 = indirectly_readable<_I1> && indirectly_readable<_I2>
774 && copy_constructible<_Fn>
775 && equivalence_relation<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
776 && equivalence_relation<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
777 && equivalence_relation<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
778 && equivalence_relation<_Fn&, iter_reference_t<_I1>,
779 iter_reference_t<_I2>>;
781 template<
typename _Fn,
typename _I1,
typename _I2 = _I1>
782 concept indirect_strict_weak_order
783 = indirectly_readable<_I1> && indirectly_readable<_I2>
784 && copy_constructible<_Fn>
785 && strict_weak_order<_Fn&, __indirect_value_t<_I1>, __indirect_value_t<_I2>>
786 && strict_weak_order<_Fn&, __indirect_value_t<_I1>, iter_reference_t<_I2>>
787 && strict_weak_order<_Fn&, iter_reference_t<_I1>, __indirect_value_t<_I2>>
788 && strict_weak_order<_Fn&, iter_reference_t<_I1>, iter_reference_t<_I2>>;
790 template<
typename _Fn,
typename... _Is>
791 requires (indirectly_readable<_Is> && ...)
792 && invocable<_Fn, iter_reference_t<_Is>...>
793 using indirect_result_t = invoke_result_t<_Fn, iter_reference_t<_Is>...>;
797 template<
typename _Iter,
typename _Proj>
802 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
803 indirect_result_t<_Proj&, _Iter>
operator*()
const;
807 using __projected_Iter = _Iter;
808 using __projected_Proj = _Proj;
812 template<weakly_incrementable _Iter,
typename _Proj>
813 struct __projected<_Iter, _Proj>
817 using value_type = remove_cvref_t<indirect_result_t<_Proj&, _Iter>>;
818 using difference_type = iter_difference_t<_Iter>;
819 indirect_result_t<_Proj&, _Iter>
operator*()
const;
821 using __projected_Iter = _Iter;
822 using __projected_Proj = _Proj;
827 template<
typename _Iter>
828 struct __projected<_Iter, identity>
829 {
using __type = _Iter; };
833 template<indirectly_readable _Iter,
834 indirectly_regular_unary_invocable<_Iter> _Proj>
835 using projected =
typename __detail::__projected<_Iter, _Proj>::__type;
838 template<
typename _Tp>
839 requires same_as<_Tp, projected<
typename _Tp::__projected_Iter,
840 typename _Tp::__projected_Proj>>
841 struct __detail::__indirect_value<_Tp>
843 using _Iter =
typename _Tp::__projected_Iter;
844 using _Proj =
typename _Tp::__projected_Proj;
845 using type = invoke_result_t<_Proj&, __indirect_value_t<_Iter>>;
848#if __glibcxx_algorithm_default_value_type
849 template<indirectly_readable _Iter,
850 indirectly_regular_unary_invocable<_Iter> _Proj>
851 using projected_value_t
852 = remove_cvref_t<invoke_result_t<_Proj&, iter_value_t<_Iter>&>>;
859 template<
typename _In,
typename _Out>
860 concept indirectly_movable = indirectly_readable<_In>
861 && indirectly_writable<_Out, iter_rvalue_reference_t<_In>>;
863 template<
typename _In,
typename _Out>
864 concept indirectly_movable_storable = indirectly_movable<_In, _Out>
865 && indirectly_writable<_Out, iter_value_t<_In>>
866 && movable<iter_value_t<_In>>
867 && constructible_from<iter_value_t<_In>, iter_rvalue_reference_t<_In>>
868 && assignable_from<iter_value_t<_In>&, iter_rvalue_reference_t<_In>>;
871 template<
typename _In,
typename _Out>
872 concept indirectly_copyable = indirectly_readable<_In>
873 && indirectly_writable<_Out, iter_reference_t<_In>>;
875 template<
typename _In,
typename _Out>
876 concept indirectly_copyable_storable = indirectly_copyable<_In, _Out>
877 && indirectly_writable<_Out, iter_value_t<_In>&>
878 && indirectly_writable<_Out, const iter_value_t<_In>&>
879 && indirectly_writable<_Out, iter_value_t<_In>&&>
880 && indirectly_writable<_Out, const iter_value_t<_In>&&>
881 && copyable<iter_value_t<_In>>
882 && constructible_from<iter_value_t<_In>, iter_reference_t<_In>>
883 && assignable_from<iter_value_t<_In>&, iter_reference_t<_In>>;
891 template<
typename _It1,
typename _It2>
892 void iter_swap(_It1, _It2) =
delete;
896 template<
typename _Tp,
typename _Up>
898 = (std::__detail::__class_or_enum<remove_reference_t<_Tp>>
899 || std::__detail::__class_or_enum<remove_reference_t<_Up>>)
900 &&
requires(_Tp&& __t, _Up&& __u) {
901 iter_swap(
static_cast<_Tp&&
>(__t),
static_cast<_Up&&
>(__u));
904 template<
typename _Xp,
typename _Yp>
905 constexpr iter_value_t<_Xp>
906 __iter_exchange_move(_Xp&& __x, _Yp&& __y)
907 noexcept(
noexcept(iter_value_t<_Xp>(iter_move(__x)))
908 &&
noexcept(*__x = iter_move(__y)))
910 iter_value_t<_Xp> __old_value(iter_move(__x));
911 *__x = iter_move(__y);
918 template<
typename _Tp,
typename _Up>
919 static constexpr bool
922 if constexpr (__adl_iswap<_Tp, _Up>)
925 else if constexpr (indirectly_readable<_Tp>
926 && indirectly_readable<_Up>
927 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
937 template<
typename _Tp,
typename _Up>
938 requires __adl_iswap<_Tp, _Up>
939 || (indirectly_readable<remove_reference_t<_Tp>>
940 && indirectly_readable<remove_reference_t<_Up>>
941 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
942 || (indirectly_movable_storable<_Tp, _Up>
943 && indirectly_movable_storable<_Up, _Tp>)
945 operator()(_Tp&& __e1, _Up&& __e2)
const
946 noexcept(_S_noexcept<_Tp, _Up>())
948 if constexpr (__adl_iswap<_Tp, _Up>)
949 iter_swap(
static_cast<_Tp&&
>(__e1),
static_cast<_Up&&
>(__e2));
950 else if constexpr (indirectly_readable<_Tp>
951 && indirectly_readable<_Up>
952 && swappable_with<iter_reference_t<_Tp>, iter_reference_t<_Up>>)
953 ranges::swap(*__e1, *__e2);
955 *__e1 = __iswap::__iter_exchange_move(__e2, __e1);
961 inline namespace _Cpo {
962 inline constexpr __iswap::_IterSwap iter_swap{};
968 template<
typename _I1,
typename _I2 = _I1>
969 concept indirectly_swappable
970 = indirectly_readable<_I1> && indirectly_readable<_I2>
971 &&
requires(
const _I1 __i1,
const _I2 __i2)
973 ranges::iter_swap(__i1, __i1);
974 ranges::iter_swap(__i2, __i2);
975 ranges::iter_swap(__i1, __i2);
976 ranges::iter_swap(__i2, __i1);
980 template<
typename _I1,
typename _I2,
typename _Rel,
typename _P1 =
identity,
982 concept indirectly_comparable
983 = indirect_binary_predicate<_Rel, projected<_I1, _P1>,
984 projected<_I2, _P2>>;
987 template<
typename _Iter>
988 concept permutable = forward_iterator<_Iter>
989 && indirectly_movable_storable<_Iter, _Iter>
990 && indirectly_swappable<_Iter, _Iter>;
993 template<
typename _I1,
typename _I2,
typename _Out,
996 concept mergeable = input_iterator<_I1> && input_iterator<_I2>
997 && weakly_incrementable<_Out> && indirectly_copyable<_I1, _Out>
998 && indirectly_copyable<_I2, _Out>
999 && indirect_strict_weak_order<_Rel, projected<_I1, _P1>,
1000 projected<_I2, _P2>>;
1005 concept sortable = permutable<_Iter>
1006 && indirect_strict_weak_order<_Rel, projected<_Iter, _Proj>>;
1008 struct unreachable_sentinel_t
1010 template<weakly_incrementable _It>
1011 friend constexpr bool
1012 operator==(unreachable_sentinel_t,
const _It&)
noexcept
1016 inline constexpr unreachable_sentinel_t unreachable_sentinel{};
1019 namespace ranges::__access
1021 using std::__detail::__class_or_enum;
1023 struct _Decay_copy final
1025 template<
typename _Tp>
1026 constexpr decay_t<_Tp>
1027 operator()(_Tp&& __t)
const
1028 noexcept(is_nothrow_convertible_v<_Tp, decay_t<_Tp>>)
1030 }
inline constexpr __decay_copy{};
1032 template<
typename _Tp>
1033 concept __member_begin =
requires(_Tp& __t)
1035 { __decay_copy(__t.begin()) } -> input_or_output_iterator;
1039 void begin() =
delete;
1041 template<
typename _Tp>
1042 concept __adl_begin = __class_or_enum<remove_reference_t<_Tp>>
1043 &&
requires(_Tp& __t)
1045 { __decay_copy(
begin(__t)) } -> input_or_output_iterator;
1050 template<
typename _Tp>
1051 requires is_array_v<_Tp> || __member_begin<_Tp&> || __adl_begin<_Tp&>
1055 if constexpr (is_array_v<_Tp>)
1057 else if constexpr (__member_begin<_Tp&>)
1067 template<
typename _Tp>
1068 using __range_iter_t
1074_GLIBCXX_END_NAMESPACE_VERSION
1076#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 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.
Implementation details not part of the namespace std interface.
[func.identity] The identity function.
ranges::less function object type.
Forward iterators support a superset of input iterator operations.
Bidirectional iterators support a superset of forward iterator operations.
Random-access iterators support a superset of bidirectional iterator operations.
Contiguous iterators point to objects stored contiguously in memory.