c++ STL set difference

Question

Does the C++ STL set data structure have a set difference operator?

Answer 1

Yes there is, it is in and is called: std::set_difference. The usage is:

#include 
#include 
#include 
// ...
std::set s1, s2;
// Fill in s1 and s2 with values
std::set result;
std::set_difference(s1.begin(), s1.end(), s2.begin(), s2.end(),
    std::inserter(result, result.end()));

In the end, the set result will contain the s1-s2.