Effects: Value-initializes current. Iterator operations applied to the resulting iterator have defined behavior if and only if the corresponding operations are defined on a value-initialized iterator of type Iterator.
constexpr explicit reverse_iterator(Iterator x);
Effects: Initializes current with x.
template <class U> constexpr reverse_iterator(const reverse_iterator<U> &u);
Effects: Initializes current with u.current.
template <class U>
constexpr reverse_iterator&
operator=(const reverse_iterator<U>& u);
Effects: Assigns u.base() to current.
Returns: *this.
constexpr Iterator base() const; // explicit
Returns: current.
constexpr reference operator*() const;
Effects: As if by:
Iterator tmp = current; return *--tmp;
constexpr pointer operator->() const;
Returns: addressof(operator*()).
constexpr reverse_iterator& operator++();
Effects: As if by: -- current;
Returns: *this.
constexpr reverse_iterator operator++(int);
Effects: As if by:
reverse_iterator tmp = *this; --current; return tmp;
constexpr reverse_iterator& operator--();
Effects: As if by ++current.
Returns: *this.
constexpr reverse_iterator operator--(int);
Effects: As if by:
reverse_iterator tmp = *this; ++current; return tmp;
constexpr reverse_iterator operator+(difference_type n) const;
Returns: reverse_iterator(current-n).
constexpr reverse_iterator& operator+=(difference_type n);
Effects: As if by: current -= n;
Returns: *this.
constexpr reverse_iterator operator-(difference_type n) const;
Returns: reverse_iterator(current+n).
constexpr reverse_iterator& operator-=(difference_type n);
Effects: As if by: current += n;
Returns: *this.
constexpr unspecified operator[](difference_type n) const;
Returns: current[-n-1].
template <class Iterator1, class Iterator2>
constexpr bool operator==(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
Returns: x.current == y.current.
template <class Iterator1, class Iterator2>
constexpr bool operator<(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
Returns: x.current > y.current.
template <class Iterator1, class Iterator2>
constexpr bool operator!=(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
Returns: x.current != y.current.
template <class Iterator1, class Iterator2>
constexpr bool operator>(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
Returns: x.current < y.current.
template <class Iterator1, class Iterator2>
constexpr bool operator>=(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
Returns: x.current <= y.current.
template <class Iterator1, class Iterator2>
constexpr bool operator<=(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
Returns: x.current >= y.current.
template <class Iterator1, class Iterator2>
constexpr auto operator-(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y) -> decltype(y.base() - x.base());
Returns: y.current - x.current.
template <class Iterator>
constexpr reverse_iterator<Iterator> operator+(
typename reverse_iterator<Iterator>::difference_type n,
const reverse_iterator<Iterator>& x);
Returns: reverse_iterator<Iterator> (x.current - n).
template <class Iterator>
constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i);
Returns: reverse_iterator<Iterator>(i).