24 Iterators library [iterators]

24.5 Iterator adaptors [predef.iterators]

24.5.4 Move iterators and sentinels [move.iterators]

24.5.4.2 Class template move_iterator [move.iterator]

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namespace std { template<class Iterator> class move_iterator { public: using iterator_type = Iterator; using iterator_concept = see below; using iterator_category = see below; // not always present using value_type = iter_value_t<Iterator>; using difference_type = iter_difference_t<Iterator>; using pointer = Iterator; using reference = iter_rvalue_reference_t<Iterator>; 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 const Iterator& base() const & noexcept; constexpr Iterator base() &&; constexpr reference operator*() const; constexpr move_iterator& operator++(); constexpr auto 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 reference operator[](difference_type n) const; template<sentinel_for<Iterator> S> friend constexpr bool operator==(const move_iterator& x, const move_sentinel<S>& y); template<sized_sentinel_for<Iterator> S> friend constexpr iter_difference_t<Iterator> operator-(const move_sentinel<S>& x, const move_iterator& y); template<sized_sentinel_for<Iterator> S> friend constexpr iter_difference_t<Iterator> operator-(const move_iterator& x, const move_sentinel<S>& y); friend constexpr iter_rvalue_reference_t<Iterator> iter_move(const move_iterator& i) noexcept(noexcept(ranges::iter_move(i.current))); template<indirectly_swappable<Iterator> Iterator2> friend constexpr void iter_swap(const move_iterator& x, const move_iterator<Iterator2>& y) noexcept(noexcept(ranges::iter_swap(x.current, y.current))); private: Iterator current; // exposition only }; }
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The member typedef-name iterator_concept is defined as follows:
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The member typedef-name iterator_category is defined if and only if the qualified-id iterator_traits<Iterator>​::​iterator_category is valid and denotes a type.
In that case, iterator_category denotes
  • (2.1)
    random_access_iterator_tag if the type iterator_traits<​Iterator>​::​iterator_category models derived_from<random_access_iterator_tag>, and
  • (2.2)
    iterator_traits<​Iterator>​::​iterator_category otherwise.