namespace std {
template<class Iterator>
class reverse_iterator {
public:
using iterator_type = Iterator;
using iterator_concept = see below;
using iterator_category = see below;
using value_type = iter_value_t<Iterator>;
using difference_type = iter_difference_t<Iterator>;
using pointer = iterator_traits<Iterator>::pointer;
using reference = iter_reference_t<Iterator>;
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 requires see below;
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);
protected:
Iterator current;
};
}
The member
typedef-name iterator_category denotes
- random_access_iterator_tag if
the type
iterator_traits<Iterator>::iterator_category models
derived_from<random_access_iterator_tag>, and
- iterator_traits<Iterator>::iterator_category otherwise.