24 Iterators library [iterators]

24.5 Iterator adaptors [predef.iterators]

24.5.1 Reverse iterators [reverse.iterators]

24.5.1.3 reverse_iterator operations [reverse.iter.ops]

24.5.1.3.9 operator+= [reverse.iter.op+=]

reverse_iterator& operator+=(typename reverse_iterator<Iterator>::difference_type n);

Effects: current -= n;

Returns: *this.