std::reverse_iterator::operators

reverse_iterator& operator++();	(1)
reverse_iterator& operator--();	(2)
reverse_iterator operator++( int );	(3)
reverse_iterator operator--( int );	(4)
reverse_iterator operator+( difference_type n ) const;	(5)
reverse_iterator operator-( difference_type n ) const;	(6)
reverse_iterator& operator+=( difference_type n );	(7)
reverse_iterator& operator-=( difference_type n );	(8)

Increments or decrements the iterator. Inverse operations are applied to the underlying operator because of the reverse order.

1-2) Pre-increments or pre-decrements by one respectively.

3-4) Post-increments or post-decrements by one respectively.

5-6) Returns an iterator which is advanced by n or -n positions respectively.

7-8) Advances the iterator by n or -n positions respectively.

1-2) *this

3-4) a copy of *this that was made before the change

5-6) reverse_iterator(base()-n) or reverse_iterator(base()+n) respectively.

7-8) *this