namespace std {
template <class Iterator>
class reverse_iterator {
public:
using iterator_type = Iterator;
using iterator_category = typename iterator_traits<Iterator>::iterator_category;
using value_type = typename iterator_traits<Iterator>::value_type;
using difference_type = typename iterator_traits<Iterator>::difference_type;
using pointer = typename iterator_traits<Iterator>::pointer;
using reference = typename iterator_traits<Iterator>::reference;
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;
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;
protected:
Iterator current;
};
template <class Iterator1, class Iterator2>
constexpr bool operator==(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator<(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator!=(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator>(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator>=(
const reverse_iterator<Iterator1>& x,
const reverse_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool 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());
template <class Iterator>
constexpr reverse_iterator<Iterator> operator+(
typename reverse_iterator<Iterator>::difference_type n,
const reverse_iterator<Iterator>& x);
template <class Iterator>
constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i);
}27.5.1.3 reverse_iterator operations [reverse.iter.ops] 27.5.1.3.1 reverse_iterator constructor [reverse.iter.cons]
constexpr reverse_iterator();
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.
27.5.1.3.2 reverse_iterator::operator= [reverse.iter.op=]template <class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
Effects: Assigns u.base() to current.
27.5.1.3.6 operator++ [reverse.iter.op++]constexpr reverse_iterator& operator++();
Effects: As if by: --current;
constexpr reverse_iterator operator++(int);
Effects: As if by:
reverse_iterator tmp = *this; --current; return tmp;27.5.1.3.7 operator-- [reverse.iter.op--]
constexpr reverse_iterator& operator--();
Effects: As if by ++current.
constexpr reverse_iterator operator--(int);
Effects: As if by:
reverse_iterator tmp = *this; ++current; return tmp;27.5.1.3.8 operator+ [reverse.iter.op+]
constexpr reverse_iterator operator+(difference_type n) const;
Returns: reverse_iterator(current-n).
27.5.1.3.13 operator== [reverse.iter.op==]template <class Iterator1, class Iterator2> constexpr bool operator==( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
Returns: x.current == y.current.
27.5.1.3.14 operator< [reverse.iter.op<]template <class Iterator1, class Iterator2> constexpr bool operator<( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
Returns: x.current > y.current.
27.5.1.3.15 operator!= [reverse.iter.op!=]template <class Iterator1, class Iterator2> constexpr bool operator!=( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
Returns: x.current != y.current.
27.5.1.3.16 operator> [reverse.iter.op>]template <class Iterator1, class Iterator2> constexpr bool operator>( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
Returns: x.current < y.current.
27.5.1.3.17 operator>= [reverse.iter.op>=]template <class Iterator1, class Iterator2> constexpr bool operator>=( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
Returns: x.current <= y.current.
27.5.1.3.18 operator<= [reverse.iter.op<=]template <class Iterator1, class Iterator2> constexpr bool operator<=( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);
Returns: x.current >= y.current.
27.5.1.3.19 operator- [reverse.iter.opdiff]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.
27.5.1.3.20 operator+ [reverse.iter.opsum]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).
27.5.1.3.21 Non-member function make_reverse_iterator() [reverse.iter.make]template <class Iterator> constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i);
Returns: reverse_iterator<Iterator>(i).
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