[reverse.iter.nonmember] (original) (raw)

24 Iterators library [iterators]

24.5 Iterator adaptors [predef.iterators]

24.5.1 Reverse iterators [reverse.iterators]

24.5.1.9 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](alg.req.ind.swap#concept:indirectly%5Fswappable "24.3.7.4 Concept indirectly_­swappable [alg.req.ind.swap]")<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).