operator-=()

transforming_iterator& operator-=

(

difference_type

n

)

Advances the transforming iterator by a given step away from the ending of the iterated sequence.

Parameters

n	A step by which to change the position of the iterator towards the beginning. If n is less than zero the advancement is done backwards, i.e. towards the end.

Returns

A reference to this.

The operator is implemented by delegating the call to the adopted iterator.

The operator is only implemented by random-access transforming iterators, i.e. if the adopted iterator implements the random-access semantics.