set_symmetric_difference

set_difference

template <class InIter1, class InIter2, class OutIter>    OutIter set_difference(InIter1 start1, InIter1 end1,                 InIter2 start2, InIter2 end2, OutIter result); template <class InIter1, class InIter2, class OutIter, class Comp>     OutIter set_difference(InIter1 start1, InIter1 end1,                 InIter2 start2, InIter2 end2,                 OutIter result, Comp cmpfn);

The set_difference( ) algorithm produces a sequence that contains the difference between the two ordered sets defined by start1, end1 and start2, end2. That is, the set defined by start2, end2 is subtracted from the set defined by start1, end1. The result is ordered and put into result. It returns an iterator to the end of the result.

The second form allows you to specify a comparison function that determines when one element is less than another.