[const.iterators.iterator] (original) (raw)

24 Iterators library [iterators]

24.5 Iterator adaptors [predef.iterators]

24.5.3 Constant iterators and sentinels [const.iterators]

24.5.3.3 Class template basic_const_iterator [const.iterators.iterator]

namespace std { template<class I> concept not-a-const-iterator = see below; template<indirectly_readable I> using iter-const-rvalue-reference-t = common_reference_t<const iter_value_t<I>&&, iter_rvalue_reference_t<I>>;template<input_iterator Iterator> class basic_const_iterator { Iterator current_ = Iterator(); using reference = iter_const_reference_t<Iterator>; using rvalue-reference = iter-const-rvalue-reference-t<Iterator>;public: using iterator_concept = see below;using iterator_category = see below; using value_type = iter_value_t<Iterator>;using difference_type = iter_difference_t<Iterator>; basic_const_iterator() requires default_initializable<Iterator> = default;constexpr basic_const_iterator(Iterator current);template<convertible_to<Iterator> U> constexpr basic_const_iterator(basic_const_iterator<U> current);template<different-from<basic_const_iterator> T> requires convertible_to<T, Iterator> constexpr basic_const_iterator(T&& current);constexpr const Iterator& base() const & noexcept;constexpr Iterator base() &&;constexpr reference operator*() const;constexpr const auto* operator->() const requires is_lvalue_reference_v<iter_reference_t<Iterator>> && same_as<remove_cvref_t<iter_reference_t<Iterator>>, value_type>;constexpr basic_const_iterator& operator++();constexpr void operator++(int);constexpr basic_const_iterator operator++(int) requires forward_iterator<Iterator>;constexpr basic_const_iterator& operator--() requires bidirectional_iterator<Iterator>;constexpr basic_const_iterator operator--(int) requires bidirectional_iterator<Iterator>;constexpr basic_const_iterator& operator+=(difference_type n) requires random_access_iterator<Iterator>;constexpr basic_const_iterator& operator-=(difference_type n) requires random_access_iterator<Iterator>;constexpr reference operator[](difference_type n) const requires random_access_iterator<Iterator>;template<sentinel_for<Iterator> S> constexpr bool operator==(const S& s) const;template<not-a-const-iterator CI> requires constant-iterator<CI> && convertible_to<Iterator const&, CI> constexpr operator CI() const &;template<not-a-const-iterator CI> requires constant-iterator<CI> && convertible_to<Iterator, CI> constexpr operator CI() &&;constexpr bool operator<(const basic_const_iterator& y) const requires random_access_iterator<Iterator>;constexpr bool operator>(const basic_const_iterator& y) const requires random_access_iterator<Iterator>;constexpr bool operator<=(const basic_const_iterator& y) const requires random_access_iterator<Iterator>;constexpr bool operator>=(const basic_const_iterator& y) const requires random_access_iterator<Iterator>;constexpr auto operator<=>(const basic_const_iterator& y) const requires random_access_iterator<Iterator> && three_way_comparable<Iterator>;template<different-from<basic_const_iterator> I> constexpr bool operator<(const I& y) const requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<different-from<basic_const_iterator> I> constexpr bool operator>(const I& y) const requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<different-from<basic_const_iterator> I> constexpr bool operator<=(const I& y) const requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<different-from<basic_const_iterator> I> constexpr bool operator>=(const I& y) const requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<different-from<basic_const_iterator> I> constexpr auto operator<=>(const I& y) const requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I> && three_way_comparable_with<Iterator, I>;template<not-a-const-iterator I> friend constexpr bool operator<(const I& x, const basic_const_iterator& y) requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<not-a-const-iterator I> friend constexpr bool operator>(const I& x, const basic_const_iterator& y) requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<not-a-const-iterator I> friend constexpr bool operator<=(const I& x, const basic_const_iterator& y) requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;template<not-a-const-iterator I> friend constexpr bool operator>=(const I& x, const basic_const_iterator& y) requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;friend constexpr basic_const_iterator operator+(const basic_const_iterator& i, difference_type n) requires random_access_iterator<Iterator>;friend constexpr basic_const_iterator operator+(difference_type n,const basic_const_iterator& i) requires random_access_iterator<Iterator>;friend constexpr basic_const_iterator operator-(const basic_const_iterator& i, difference_type n) requires random_access_iterator<Iterator>;template<sized_sentinel_for<Iterator> S> constexpr difference_type operator-(const S& y) const;template<not-a-const-iterator S> requires sized_sentinel_for<S, Iterator> friend constexpr difference_type operator-(const S& x, const basic_const_iterator& y);friend constexpr rvalue-reference iter_move(const basic_const_iterator& i) noexcept(noexcept(static_cast<_rvalue-reference_>(ranges::iter_move(i.current_)))) { return static_cast<_rvalue-reference_>(ranges::iter_move(i.current_));} };}

Given some type I, the concept not-a-const-iterator is defined as falseif I is a specialization of basic_const_iterator andtrue otherwise.