const self& operator-=(difference_type n)
Move this iterator forward by n elements.
The amount and direction of movement. If negative, will move backward by |n| element.
Reference to this iterator at new position.
db_vector_base_iterator::operator-=(difference_type n)
These functions have identical behaviors and semantics as those of db_vector_base_iterator , so please refer to equivalent in that class.
db_vector_iterator