=====set_difference=====
Syntax:

<code>
    #include <algorithm>
    template< typename InIterA, typename InIterB, typename OutIter >
    OutIter set_difference( InIterA start1, InIterA end1, InIterB start2, InIterB end2, OutIter result );
    template< typename InIterA, typename InIterB, typename OutIter, typename StrictWeakOrdering >
    OutIter set_difference( InIterA start1, InIterA end1, InIterB start2, InIterB end2, OutIter result, StrictWeakOrdering cmp );
</code>

The set_difference() algorithm computes the difference between two sets defined
by [start1,end1) and [start2,end2) and stores the difference starting at
result.

Both of the sets, given as ranges, must be sorted in ascending order.

The return value of set_difference() is an iterator to the end of the result
range.

If the strict weak ordering comparison function object cmp is not specified,
set_difference() will use the < operator to compare elements.

Related Topics: [[includes]], [[set_intersection]], [[set_symmetric_difference]], [[set_union]]