9 Iterators library [iterators]

9.7 Iterator adaptors [iterators.predef]

9.7.1 Reverse iterators [iterators.reverse]

9.7.1.2 reverse_iterator operations [reverse.iter.ops]

9.7.1.2.22 iter_swap [reverse.iter.iter_swap]

template <IndirectlySwappable<I> I2> friend constexpr void iter_swap(const reverse_iterator& x, const reverse_iterator<I2>& y) noexcept(see below);

1

Effects: Equivalent to ranges::iter_swap(prev(x.current), prev(y.current)).

2

Remarks: The expression in noexcept is equivalent to: 

  noexcept(ranges::iter_swap(declval<I>(), declval<I>())) && noexcept(--declval<I&>())