23 Iterators library [iterators]

23.5 Iterator adaptors [predef.iterators]

23.5.1 Reverse iterators [reverse.iterators]

23.5.1.9 Non-member functions [reverse.iter.nonmember]

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.base() - x.base().
template<class Iterator> constexpr reverse_iterator<Iterator> operator+( iter_difference_t<Iterator> n, const reverse_iterator<Iterator>& x);
Returns: reverse_­iterator<Iterator>(x.base() - n).
friend constexpr iter_rvalue_reference_t<Iterator> iter_move(const reverse_iterator& i) noexcept(see below);
Effects: Equivalent to: auto tmp = i.base(); return ranges::iter_move(--tmp);
Remarks: The exception specification is equivalent to: is_nothrow_copy_constructible_v<Iterator> && noexcept(ranges::iter_move(--declval<Iterator&>()))
template<indirectly_­swappable<Iterator> Iterator2> friend constexpr void iter_swap(const reverse_iterator& x, const reverse_iterator<Iterator2>& y) noexcept(see below);
Effects: Equivalent to: auto xtmp = x.base(); auto ytmp = y.base(); ranges::iter_swap(--xtmp, --ytmp);
Remarks: The exception specification is equivalent to: is_nothrow_copy_constructible_v<Iterator> && is_nothrow_copy_constructible_v<Iterator2> && noexcept(ranges::iter_swap(--declval<Iterator&>(), --declval<Iterator2&>()))
template<class Iterator> constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i);
Returns: reverse_­iterator<Iterator>(i).