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+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_ITERATOR
+#define _LIBCPP_ITERATOR
+
+/*
+ iterator synopsis
+
+#include <concepts>
+
+namespace std
+{
+template<class> struct incrementable_traits; // since C++20
+template<class T>
+ using iter_difference_t = see below; // since C++20
+
+template<class> struct indirectly_readable_traits; // since C++20
+template<class T>
+ using iter_value_t = see below; // since C++20
+
+template<class Iterator>
+struct iterator_traits;
+
+template<class T>
+ requires is_object_v<T> // since C++20
+struct iterator_traits<T*>;
+
+template<dereferenceable T>
+ using iter_reference_t = decltype(*declval<T&>());
+
+namespace ranges::inline unspecified {
+ inline constexpr unspecified iter_move = unspecified; // since C++20, nodiscard as an extension
+}}
+
+template<dereferenceable T>
+ requires ...
+using iter_rvalue_reference_t = decltype(ranges::iter_move(declval<T&>())); // since C++20
+
+// [iterator.concepts], iterator concepts
+// [iterator.concept.readable], concept indirectly_readable
+template<class In>
+ concept indirectly_readable = see below; // since C++20
+
+template<indirectly_readable T>
+ using iter_common_reference_t =
+ common_reference_t<iter_reference_t<T>, iter_value_t<T>&>; // since C++20
+
+// [iterator.concept.writable], concept indirectly_writable
+template<class Out, class T>
+ concept indirectly_writable = see below; // since C++20
+
+// [iterator.concept.winc], concept weakly_incrementable
+template<class I>
+ concept weakly_incrementable = see below; // since C++20
+
+// [iterator.concept.inc], concept incrementable
+template<class I>
+ concept incrementable = see below; // since C++20
+
+// [iterator.concept.iterator], concept input_or_output_iterator
+ template<class I>
+ concept input_or_output_iterator = see below; // since C++20
+
+// [iterator.concept.sentinel], concept sentinel_for
+template<class S, class I>
+ concept sentinel_for = see below; // since C++20
+
+// [iterator.concept.sizedsentinel], concept sized_sentinel_for
+template<class S, class I>
+ inline constexpr bool disable_sized_sentinel_for = false;
+
+template<class S, class I>
+ concept sized_sentinel_for = see below;
+
+// [iterator.concept.input], concept input_iterator
+template<class I>
+ concept input_iterator = see below; // since C++20
+
+// [iterator.concept.output], concept output_iterator
+template<class I, class T>
+ concept output_iterator = see below; // since C++20
+
+// [iterator.concept.forward], concept forward_iterator
+template<class I>
+ concept forward_iterator = see below; // since C++20
+
+// [iterator.concept.bidir], concept bidirectional_iterator
+template<class I>
+ concept bidirectional_iterator = see below; // since C++20
+
+// [iterator.concept.random.access], concept random_access_iterator
+template<class I>
+ concept random_access_iterator = see below; // since C++20
+
+// [indirectcallable]
+// [indirectcallable.indirectinvocable]
+template<class F, class I>
+ concept indirectly_unary_invocable = see below; // since C++20
+
+template<class F, class I>
+ concept indirectly_regular_unary_invocable = see below; // since C++20
+
+template<class F, class I>
+ concept indirect_unary_predicate = see below; // since C++20
+
+template<class F, class I1, class I2>
+ concept indirect_binary_predicate = see below; // since C++20
+
+template<class F, class I1, class I2 = I1>
+ concept indirect_equivalence_relation = see below; // since C++20
+
+template<class F, class I1, class I2 = I1>
+ concept indirect_strict_weak_order = see below; // since C++20
+
+template<class F, class... Is>
+ using indirect_result_t = see below; // since C++20
+
+// [projected], projected
+template<indirectly_readable I, indirectly_regular_unary_invocable<I> Proj>
+ struct projected; // since C++20
+
+template<weakly_incrementable I, indirectly_regular_unary_invocable<I> Proj>
+ struct incrementable_traits<projected<I, Proj>>; // since C++20
+
+// [alg.req.ind.move], concept indirectly_movable
+template<class In, class Out>
+ concept indirectly_movable = see below; // since C++20
+
+template<class In, class Out>
+ concept indirectly_movable_storable = see below; // since C++20
+
+// [alg.req.ind.copy], concept indirectly_copyable
+template<class In, class Out>
+ concept indirectly_copyable = see below; // since C++20
+
+template<class In, class Out>
+ concept indirectly_copyable_storable = see below; // since C++20
+
+// [alg.req.ind.swap], concept indirectly_swappable
+template<class I1, class I2 = I1>
+ concept indirectly_swappable = see below; // since C++20
+
+template<class I1, class I2, class R, class P1 = identity,
+ class P2 = identity>
+ concept indirectly_comparable =
+ indirect_binary_predicate<R, projected<I1, P1>, projected<I2, P2>>; // since C++20
+
+// [alg.req.permutable], concept permutable
+template<class I>
+ concept permutable = see below; // since C++20
+
+ // [alg.req.mergeable], concept mergeable
+template<class I1, class I2, class Out,
+ class R = ranges::less, class P1 = identity, class P2 = identity>
+ concept mergeable = see below; // since C++20
+
+// [alg.req.sortable], concept sortable
+template<class I, class R = ranges::less, class P = identity>
+ concept sortable = see below; // since C++20
+
+template<input_or_output_iterator I, sentinel_for<I> S>
+ requires (!same_as<I, S> && copyable<I>)
+class common_iterator; // since C++20
+
+template<class Category, class T, class Distance = ptrdiff_t,
+ class Pointer = T*, class Reference = T&>
+struct iterator // deprecated in C++17
+{
+ typedef T value_type;
+ typedef Distance difference_type;
+ typedef Pointer pointer;
+ typedef Reference reference;
+ typedef Category iterator_category;
+};
+
+struct input_iterator_tag {};
+struct output_iterator_tag {};
+struct forward_iterator_tag : public input_iterator_tag {};
+struct bidirectional_iterator_tag : public forward_iterator_tag {};
+struct random_access_iterator_tag : public bidirectional_iterator_tag {};
+struct contiguous_iterator_tag : public random_access_iterator_tag {};
+
+// 27.4.3, iterator operations
+template <class InputIterator, class Distance> // constexpr in C++17
+ constexpr void advance(InputIterator& i, Distance n);
+
+template <class InputIterator> // constexpr in C++17
+ constexpr typename iterator_traits<InputIterator>::difference_type
+ distance(InputIterator first, InputIterator last);
+
+template <class InputIterator> // constexpr in C++17
+ constexpr InputIterator next(InputIterator x,
+typename iterator_traits<InputIterator>::difference_type n = 1);
+
+template <class BidirectionalIterator> // constexpr in C++17
+ constexpr BidirectionalIterator prev(BidirectionalIterator x,
+ typename iterator_traits<BidirectionalIterator>::difference_type n = 1);
+
+// [range.iter.ops], range iterator operations
+namespace ranges {
+ // [range.iter.op.advance], ranges::advance
+ template<input_or_output_iterator I>
+ constexpr void advance(I& i, iter_difference_t<I> n); // since C++20
+ template<input_or_output_iterator I, sentinel_for<I> S>
+ constexpr void advance(I& i, S bound); // since C++20
+ template<input_or_output_iterator I, sentinel_for<I> S>
+ constexpr iter_difference_t<I> advance(I& i, iter_difference_t<I> n, S bound); // since C++20
+}
+
+template <class Iterator>
+class reverse_iterator
+ : public iterator<typename iterator_traits<Iterator>::iterator_category, // until C++17
+ typename iterator_traits<Iterator>::value_type,
+ typename iterator_traits<Iterator>::difference_type,
+ typename iterator_traits<Iterator>::pointer,
+ typename iterator_traits<Iterator>::reference>
+{
+protected:
+ Iterator current;
+public:
+ using iterator_type = Iterator;
+ using iterator_concept = see below; // since C++20
+ using iterator_category = typename iterator_traits<Iterator>::iterator_category; // since C++17, until C++20
+ using iterator_category = see below; // since C++20
+ using value_type = typename iterator_traits<Iterator>::value_type; // since C++17, until C++20
+ using value_type = iter_value_t<Iterator>; // since C++20
+ using difference_type = typename iterator_traits<Iterator>::difference_type; // until C++20
+ using difference_type = iter_difference_t<Iterator>; // since C++20
+ using pointer = typename iterator_traits<Iterator>::pointer;
+ using reference = typename iterator_traits<Iterator>::reference; // until C++20
+ using reference = iter_reference_t<Iterator>; // since C++20
+
+ constexpr reverse_iterator();
+ constexpr explicit reverse_iterator(Iterator x);
+ template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
+ template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
+ constexpr Iterator base() const;
+ constexpr reference operator*() const;
+ constexpr pointer operator->() const; // until C++20
+ constexpr pointer operator->() const requires see below; // since C++20
+ constexpr reverse_iterator& operator++();
+ constexpr reverse_iterator operator++(int);
+ constexpr reverse_iterator& operator--();
+ constexpr reverse_iterator operator--(int);
+ constexpr reverse_iterator operator+ (difference_type n) const;
+ constexpr reverse_iterator& operator+=(difference_type n);
+ constexpr reverse_iterator operator- (difference_type n) const;
+ constexpr reverse_iterator& operator-=(difference_type n);
+ constexpr unspecified operator[](difference_type n) const;
+
+ friend constexpr iter_rvalue_reference_t<Iterator>
+ iter_move(const reverse_iterator& i) noexcept(see below);
+ template<indirectly_swappable<Iterator> Iterator2>
+ friend constexpr void
+ iter_swap(const reverse_iterator& x,
+ const reverse_iterator<Iterator2>& y) noexcept(see below);
+};
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator==(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator!=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator<(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator>(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator<=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator>=(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
+
+template<class Iterator1, three_way_comparable_with<Iterator1> Iterator2>
+ constexpr compare_three_way_result_t<Iterator1, Iterator2>
+ operator<=>(const reverse_iterator<Iterator1>& x,
+ const reverse_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr auto
+operator-(const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y)
+-> decltype(__y.base() - __x.base()); // constexpr in C++17
+
+template <class Iterator>
+constexpr reverse_iterator<Iterator>
+operator+(typename reverse_iterator<Iterator>::difference_type n,
+ const reverse_iterator<Iterator>& x); // constexpr in C++17
+
+template <class Iterator>
+constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i); // C++14, constexpr in C++17
+
+template<class Iterator1, class Iterator2>
+ requires (!sized_sentinel_for<Iterator1, Iterator2>)
+ inline constexpr bool disable_sized_sentinel_for<reverse_iterator<Iterator1>,
+ reverse_iterator<Iterator2>> = true;
+
+template <class Container>
+class back_insert_iterator
+ : public iterator<output_iterator_tag, void, void, void, void> // until C++17
+{
+protected:
+ Container* container;
+public:
+ typedef Container container_type;
+ typedef void value_type;
+ typedef void difference_type; // until C++20
+ typedef ptrdiff_t difference_type; // since C++20
+ typedef void reference;
+ typedef void pointer;
+
+ explicit back_insert_iterator(Container& x); // constexpr in C++20
+ back_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20
+ back_insert_iterator& operator*(); // constexpr in C++20
+ back_insert_iterator& operator++(); // constexpr in C++20
+ back_insert_iterator operator++(int); // constexpr in C++20
+};
+
+template <class Container> back_insert_iterator<Container> back_inserter(Container& x); // constexpr in C++20
+
+template <class Container>
+class front_insert_iterator
+ : public iterator<output_iterator_tag, void, void, void, void> // until C++17
+{
+protected:
+ Container* container;
+public:
+ typedef Container container_type;
+ typedef void value_type;
+ typedef void difference_type; // until C++20
+ typedef ptrdiff_t difference_type; // since C++20
+ typedef void reference;
+ typedef void pointer;
+
+ explicit front_insert_iterator(Container& x); // constexpr in C++20
+ front_insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20
+ front_insert_iterator& operator*(); // constexpr in C++20
+ front_insert_iterator& operator++(); // constexpr in C++20
+ front_insert_iterator operator++(int); // constexpr in C++20
+};
+
+template <class Container> front_insert_iterator<Container> front_inserter(Container& x); // constexpr in C++20
+
+template <class Container>
+class insert_iterator
+ : public iterator<output_iterator_tag, void, void, void, void> // until C++17
+{
+protected:
+ Container* container;
+ typename Container::iterator iter;
+public:
+ typedef Container container_type;
+ typedef void value_type;
+ typedef void difference_type; // until C++20
+ typedef ptrdiff_t difference_type; // since C++20
+ typedef void reference;
+ typedef void pointer;
+
+ insert_iterator(Container& x, typename Container::iterator i); // constexpr in C++20
+ insert_iterator& operator=(const typename Container::value_type& value); // constexpr in C++20
+ insert_iterator& operator*(); // constexpr in C++20
+ insert_iterator& operator++(); // constexpr in C++20
+ insert_iterator& operator++(int); // constexpr in C++20
+};
+
+template <class Container>
+insert_iterator<Container> inserter(Container& x, typename Container::iterator i); // until C++20
+template <class Container>
+constexpr insert_iterator<Container> inserter(Container& x, ranges::iterator_t<Container> i); // since C++20
+
+template <class Iterator>
+class move_iterator {
+public:
+ using iterator_type = Iterator;
+ using iterator_concept = see below; // From C++20
+ using iterator_category = see below; // not always present starting from C++20
+ using value_type = iter_value_t<Iterator>; // Until C++20, iterator_traits<Iterator>::value_type
+ using difference_type = iter_difference_t<Iterator>; // Until C++20, iterator_traits<Iterator>::difference_type;
+ using pointer = Iterator;
+ using reference = iter_rvalue_reference_t<Iterator>; // Until C++20, value_type&&
+
+ constexpr move_iterator(); // all the constexprs are in C++17
+ constexpr explicit move_iterator(Iterator i);
+ template <class U>
+ constexpr move_iterator(const move_iterator<U>& u);
+ template <class U>
+ constexpr move_iterator& operator=(const move_iterator<U>& u);
+
+ constexpr iterator_type base() const; // Until C++20
+ constexpr const Iterator& base() const & noexcept; // From C++20
+ constexpr Iterator base() &&; // From C++20
+
+ constexpr reference operator*() const;
+ constexpr pointer operator->() const; // Deprecated in C++20
+ constexpr move_iterator& operator++();
+ constexpr auto operator++(int); // Return type was move_iterator until C++20
+ constexpr move_iterator& operator--();
+ constexpr move_iterator operator--(int);
+ constexpr move_iterator operator+(difference_type n) const;
+ constexpr move_iterator& operator+=(difference_type n);
+ constexpr move_iterator operator-(difference_type n) const;
+ constexpr move_iterator& operator-=(difference_type n);
+ constexpr reference operator[](difference_type n) const; // Return type unspecified until C++20
+
+ template<sentinel_for<Iterator> S>
+ friend constexpr bool
+ operator==(const move_iterator& x, const move_sentinel<S>& y); // Since C++20
+ template<sized_sentinel_for<Iterator> S>
+ friend constexpr iter_difference_t<Iterator>
+ operator-(const move_sentinel<S>& x, const move_iterator& y); // Since C++20
+ template<sized_sentinel_for<Iterator> S>
+ friend constexpr iter_difference_t<Iterator>
+ operator-(const move_iterator& x, const move_sentinel<S>& y); // Since C++20
+ friend constexpr iter_rvalue_reference_t<Iterator>
+ iter_move(const move_iterator& i)
+ noexcept(noexcept(ranges::iter_move(i.current))); // Since C++20
+ template<indirectly_swappable<Iterator> Iterator2>
+ friend constexpr void
+ iter_swap(const move_iterator& x, const move_iterator<Iterator2>& y)
+ noexcept(noexcept(ranges::iter_swap(x.current, y.current))); // Since C++20
+
+private:
+ Iterator current; // exposition only
+};
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr bool // constexpr in C++17
+operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
+
+template <class Iterator1, class Iterator2>
+constexpr auto // constexpr in C++17
+operator-(const move_iterator<Iterator1>& x,
+ const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
+
+template <class Iterator>
+constexpr move_iterator<Iterator> operator+( // constexpr in C++17
+ typename move_iterator<Iterator>::difference_type n,
+ const move_iterator<Iterator>& x);
+
+template <class Iterator> // constexpr in C++17
+constexpr move_iterator<Iterator> make_move_iterator(const Iterator& i);
+
+template<class Iterator1, class Iterator2>
+ requires (!sized_sentinel_for<Iterator1, Iterator2>)
+ inline constexpr bool disable_sized_sentinel_for<move_iterator<Iterator1>, // since C++20
+ move_iterator<Iterator2>> = true;
+
+template<semiregular S>
+class move_sentinel {
+public:
+ constexpr move_sentinel();
+ constexpr explicit move_sentinel(S s);
+ template<class S2>
+ requires convertible_to<const S2&, S>
+ constexpr move_sentinel(const move_sentinel<S2>& s);
+ template<class S2>
+ requires assignable_from<S&, const S2&>
+ constexpr move_sentinel& operator=(const move_sentinel<S2>& s);
+
+ constexpr S base() const;
+private:
+ S last; // exposition only
+};
+
+// [default.sentinel], default sentinel
+struct default_sentinel_t;
+inline constexpr default_sentinel_t default_sentinel{};
+
+// [iterators.counted], counted iterators
+template<input_or_output_iterator I> class counted_iterator;
+
+template<input_iterator I>
+ requires see below
+ struct iterator_traits<counted_iterator<I>>;
+
+// [unreachable.sentinel], unreachable sentinel
+struct unreachable_sentinel_t;
+inline constexpr unreachable_sentinel_t unreachable_sentinel{};
+
+template <class T, class charT = char, class traits = char_traits<charT>, class Distance = ptrdiff_t>
+class istream_iterator
+ : public iterator<input_iterator_tag, T, Distance, const T*, const T&> // until C++17
+{
+public:
+ typedef input_iterator_tag iterator_category;
+ typedef T value_type;
+ typedef Distance difference_type;
+ typedef const T* pointer;
+ typedef const T& reference;
+
+ typedef charT char_type;
+ typedef traits traits_type;
+ typedef basic_istream<charT, traits> istream_type;
+
+ istream_iterator(); // constexpr since C++11
+ constexpr istream_iterator(default_sentinel_t); // since C++20
+ istream_iterator(istream_type& s);
+ constexpr istream_iterator(const istream_iterator& x) noexcept(see below);
+ ~istream_iterator();
+
+ const T& operator*() const;
+ const T* operator->() const;
+ istream_iterator& operator++();
+ istream_iterator operator++(int);
+ friend bool operator==(const istream_iterator& i, default_sentinel_t); // since C++20
+};
+
+template <class T, class charT, class traits, class Distance>
+bool operator==(const istream_iterator<T,charT,traits,Distance>& x,
+ const istream_iterator<T,charT,traits,Distance>& y);
+template <class T, class charT, class traits, class Distance>
+bool operator!=(const istream_iterator<T,charT,traits,Distance>& x,
+ const istream_iterator<T,charT,traits,Distance>& y); // until C++20
+
+template <class T, class charT = char, class traits = char_traits<charT> >
+class ostream_iterator
+ : public iterator<output_iterator_tag, void, void, void, void> // until C++17
+{
+public:
+ typedef output_iterator_tag iterator_category;
+ typedef void value_type;
+ typedef void difference_type; // until C++20
+ typedef ptrdiff_t difference_type; // since C++20
+ typedef void pointer;
+ typedef void reference;
+
+ typedef charT char_type;
+ typedef traits traits_type;
+ typedef basic_ostream<charT,traits> ostream_type;
+
+ ostream_iterator(ostream_type& s);
+ ostream_iterator(ostream_type& s, const charT* delimiter);
+ ostream_iterator(const ostream_iterator& x);
+ ~ostream_iterator();
+ ostream_iterator& operator=(const T& value);
+
+ ostream_iterator& operator*();
+ ostream_iterator& operator++();
+ ostream_iterator& operator++(int);
+};
+
+template<class charT, class traits = char_traits<charT> >
+class istreambuf_iterator
+ : public iterator<input_iterator_tag, charT, traits::off_type, unspecified, charT> // until C++17
+{
+public:
+ typedef input_iterator_tag iterator_category;
+ typedef charT value_type;
+ typedef traits::off_type difference_type;
+ typedef unspecified pointer;
+ typedef charT reference;
+
+ typedef charT char_type;
+ typedef traits traits_type;
+ typedef traits::int_type int_type;
+ typedef basic_streambuf<charT, traits> streambuf_type;
+ typedef basic_istream<charT, traits> istream_type;
+
+ istreambuf_iterator() noexcept; // constexpr since C++11
+ constexpr istreambuf_iterator(default_sentinel_t) noexcept; // since C++20
+ istreambuf_iterator(istream_type& s) noexcept;
+ istreambuf_iterator(streambuf_type* s) noexcept;
+ istreambuf_iterator(a-private-type) noexcept;
+
+ charT operator*() const;
+ pointer operator->() const;
+ istreambuf_iterator& operator++();
+ a-private-type operator++(int);
+
+ bool equal(const istreambuf_iterator& b) const;
+ friend bool operator==(const istreambuf_iterator& i, default_sentinel_t s); // since C++20
+};
+
+template <class charT, class traits>
+bool operator==(const istreambuf_iterator<charT,traits>& a,
+ const istreambuf_iterator<charT,traits>& b);
+template <class charT, class traits>
+bool operator!=(const istreambuf_iterator<charT,traits>& a,
+ const istreambuf_iterator<charT,traits>& b); // until C++20
+
+template <class charT, class traits = char_traits<charT> >
+class ostreambuf_iterator
+ : public iterator<output_iterator_tag, void, void, void, void> // until C++17
+{
+public:
+ typedef output_iterator_tag iterator_category;
+ typedef void value_type;
+ typedef void difference_type; // until C++20
+ typedef ptrdiff_t difference_type; // since C++20
+ typedef void pointer;
+ typedef void reference;
+
+ typedef charT char_type;
+ typedef traits traits_type;
+ typedef basic_streambuf<charT, traits> streambuf_type;
+ typedef basic_ostream<charT, traits> ostream_type;
+
+ ostreambuf_iterator(ostream_type& s) noexcept;
+ ostreambuf_iterator(streambuf_type* s) noexcept;
+ ostreambuf_iterator& operator=(charT c);
+ ostreambuf_iterator& operator*();
+ ostreambuf_iterator& operator++();
+ ostreambuf_iterator& operator++(int);
+ bool failed() const noexcept;
+};
+
+template <class C> constexpr auto begin(C& c) -> decltype(c.begin()); // constexpr since C++17
+template <class C> constexpr auto begin(const C& c) -> decltype(c.begin()); // constexpr since C++17
+template <class C> constexpr auto end(C& c) -> decltype(c.end()); // constexpr since C++17
+template <class C> constexpr auto end(const C& c) -> decltype(c.end()); // constexpr since C++17
+template <class T, size_t N> constexpr T* begin(T (&array)[N]) noexcept;
+template <class T, size_t N> constexpr T* end(T (&array)[N]) noexcept;
+
+template <class C> constexpr auto cbegin(const C& c) noexcept(see-below) -> decltype(std::begin(c)); // C++14
+template <class C> constexpr auto cend(const C& c) noexcept(see-below) -> decltype(std::end(c)); // C++14
+template <class C> constexpr auto rbegin(C& c) -> decltype(c.rbegin()); // C++14, constexpr since C++17
+template <class C> constexpr auto rbegin(const C& c) -> decltype(c.rbegin()); // C++14, constexpr since C++17
+template <class C> constexpr auto rend(C& c) -> decltype(c.rend()); // C++14, constexpr since C++17
+template <class C> constexpr auto rend(const C& c) -> decltype(c.rend()); // C++14, constexpr since C++17
+template <class E> constexpr reverse_iterator<const E*> rbegin(initializer_list<E> il); // C++14, constexpr since C++17
+template <class E> constexpr reverse_iterator<const E*> rend(initializer_list<E> il); // C++14, constexpr since C++17
+template <class T, size_t N> constexpr reverse_iterator<T*> rbegin(T (&array)[N]); // C++14, constexpr since C++17
+template <class T, size_t N> constexpr reverse_iterator<T*> rend(T (&array)[N]); // C++14, constexpr since C++17
+template <class C> constexpr auto crbegin(const C& c) -> decltype(std::rbegin(c)); // C++14, constexpr since C++17
+template <class C> constexpr auto crend(const C& c) -> decltype(std::rend(c)); // C++14, constexpr since C++17
+
+// 24.8, container access:
+template <class C> constexpr auto size(const C& c) -> decltype(c.size()); // C++17
+template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept; // C++17
+
+template <class C> constexpr auto ssize(const C& c)
+ -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size())>>; // C++20
+template <class T, ptrdiff_t> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept; // C++20
+
+template <class C> constexpr auto empty(const C& c) -> decltype(c.empty()); // C++17
+template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept; // C++17
+template <class E> constexpr bool empty(initializer_list<E> il) noexcept; // C++17
+template <class C> constexpr auto data(C& c) -> decltype(c.data()); // C++17
+template <class C> constexpr auto data(const C& c) -> decltype(c.data()); // C++17
+template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept; // C++17
+template <class E> constexpr const E* data(initializer_list<E> il) noexcept; // C++17
+
+} // std
+
+*/
+
+#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
+# include <__cxx03/iterator>
+#else
+# include <__config>
+# include <__iterator/access.h>
+# include <__iterator/advance.h>
+# include <__iterator/back_insert_iterator.h>
+# include <__iterator/distance.h>
+# include <__iterator/front_insert_iterator.h>
+# include <__iterator/insert_iterator.h>
+# include <__iterator/istream_iterator.h>
+# include <__iterator/istreambuf_iterator.h>
+# include <__iterator/iterator.h>
+# include <__iterator/iterator_traits.h>
+# include <__iterator/move_iterator.h>
+# include <__iterator/next.h>
+# include <__iterator/ostream_iterator.h>
+# include <__iterator/ostreambuf_iterator.h>
+# include <__iterator/prev.h>
+# include <__iterator/reverse_iterator.h>
+# include <__iterator/wrap_iter.h>
+
+# if _LIBCPP_STD_VER >= 14
+# include <__iterator/reverse_access.h>
+# endif
+
+# if _LIBCPP_STD_VER >= 17
+# include <__iterator/data.h>
+# include <__iterator/empty.h>
+# include <__iterator/size.h>
+# endif
+
+# if _LIBCPP_STD_VER >= 20
+# include <__iterator/common_iterator.h>
+# include <__iterator/concepts.h>
+# include <__iterator/counted_iterator.h>
+# include <__iterator/default_sentinel.h>
+# include <__iterator/incrementable_traits.h>
+# include <__iterator/indirectly_comparable.h>
+# include <__iterator/iter_move.h>
+# include <__iterator/iter_swap.h>
+# include <__iterator/mergeable.h>
+# include <__iterator/move_sentinel.h>
+# include <__iterator/permutable.h>
+# include <__iterator/projected.h>
+# include <__iterator/readable_traits.h>
+# include <__iterator/sortable.h>
+# include <__iterator/unreachable_sentinel.h>
+# endif
+
+# include <version>
+
+// standard-mandated includes
+
+// [iterator.synopsis]
+# include <compare>
+# include <concepts>
+
+// [range.access.general]
+# if _LIBCPP_STD_VER >= 20
+# include <__ranges/access.h>
+# include <__ranges/data.h>
+# include <__ranges/empty.h>
+# include <__ranges/rbegin.h>
+# include <__ranges/rend.h>
+# include <__ranges/size.h>
+# endif
+
+# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+# endif
+
+# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 17
+# include <variant>
+# endif
+
+# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
+# include <cstddef>
+# include <cstdlib>
+# include <exception>
+# include <new>
+# include <type_traits>
+# include <typeinfo>
+# include <utility>
+# endif
+#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
+
+#endif // _LIBCPP_ITERATOR
generated by cgit v1.2.3 (git 2.46.0) at 2026-10-29 00:28:43 +0000