namespace std {
template <class Iterator>
class move_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 = Iterator;
using reference = see below;
constexpr move_iterator();
constexpr explicit move_iterator(Iterator i);
template <class U> constexpr move_iterator(const move_iterator<U>& u);
template <class U> constexpr move_iterator& operator=(const move_iterator<U>& u);
constexpr iterator_type base() const;
constexpr reference operator*() const;
constexpr pointer operator->() const;
constexpr move_iterator& operator++();
constexpr move_iterator operator++(int);
constexpr move_iterator& operator--();
constexpr move_iterator operator--(int);
constexpr move_iterator operator+(difference_type n) const;
constexpr move_iterator& operator+=(difference_type n);
constexpr move_iterator operator-(difference_type n) const;
constexpr move_iterator& operator-=(difference_type n);
constexpr unspecified operator[](difference_type n) const;
private:
Iterator current; };
template <class Iterator1, class Iterator2>
constexpr bool operator==(
const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator!=(
const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator<(
const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator<=(
const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator>(
const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr bool operator>=(
const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2>
constexpr auto operator-(
const move_iterator<Iterator1>& x,
const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
template <class Iterator>
constexpr move_iterator<Iterator> operator+(
typename move_iterator<Iterator>::difference_type n, const move_iterator<Iterator>& x);
template <class Iterator>
constexpr move_iterator<Iterator> make_move_iterator(Iterator i);
}
Let R denote iterator_traits<Iterator>::reference. If is_reference_v<R> is true, the template specialization move_iterator<Iterator> shall define the nested type named reference as a synonym for remove_reference_t<R>&&, otherwise as a synonym for R.
27.5.3.3 move_iterator operations [move.iter.ops] 27.5.3.3.1 move_iterator constructors [move.iter.op.const]constexpr move_iterator();
Effects: Constructs a move_iterator, value-initializing 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 move_iterator(Iterator i);
Effects: Constructs a move_iterator, initializing current with i.
template <class U> constexpr move_iterator(const move_iterator<U>& u);
Effects: Constructs a move_iterator, initializing current with u.base().
Requires: U shall be convertible to Iterator.
27.5.3.3.2 move_iterator::operator= [move.iter.op=]template <class U> constexpr move_iterator& operator=(const move_iterator<U>& u);
Effects: Assigns u.base() to current.
Requires: U shall be convertible to Iterator.
27.5.3.3.6 move_iterator::operator++ [move.iter.op.incr]constexpr move_iterator& operator++();
Effects: As if by ++current.
constexpr move_iterator operator++(int);
Effects: As if by:
move_iterator tmp = *this; ++current; return tmp;27.5.3.3.7 move_iterator::operator-- [move.iter.op.decr]
constexpr move_iterator& operator--();
Effects: As if by --current.
constexpr move_iterator operator--(int);
Effects: As if by:
move_iterator tmp = *this; --current; return tmp;27.5.3.3.8 move_iterator::operator+ [move.iter.op.+]
constexpr move_iterator operator+(difference_type n) const;
Returns: move_iterator(current + n).
27.5.3.3.9 move_iterator::operator+= [move.iter.op.+=]constexpr move_iterator& operator+=(difference_type n);
Effects: As if by: current += n;
27.5.3.3.10 move_iterator::operator- [move.iter.op.-]constexpr move_iterator operator-(difference_type n) const;
Returns: move_iterator(current - n).
27.5.3.3.11 move_iterator::operator-= [move.iter.op.-=]constexpr move_iterator& operator-=(difference_type n);
Effects: As if by: current -= n;
27.5.3.3.13 move_iterator comparisons [move.iter.op.comp]template <class Iterator1, class Iterator2> constexpr bool operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
Returns: x.base() == y.base().
template <class Iterator1, class Iterator2> constexpr bool operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2> constexpr bool operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
Returns: x.base() < y.base().
template <class Iterator1, class Iterator2> constexpr bool operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2> constexpr bool operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2> constexpr bool operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
template <class Iterator1, class Iterator2> constexpr auto operator-( const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
Returns: x.base() - y.base().
template <class Iterator> constexpr move_iterator<Iterator> operator+( typename move_iterator<Iterator>::difference_type n, const move_iterator<Iterator>& x);
template <class Iterator> constexpr move_iterator<Iterator> make_move_iterator(Iterator i);
Returns: move_iterator<Iterator>(i).
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