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);
}
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