set_diff.cpp

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#include <algorithm>
#include <set>
#include <iostream>
#include <iterator>
 
 
int main ()
{
    // Initialize some sets.
    const int a1 [] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
    const int a2 [] = { 2, 4, 6, 8, 10, 12 };
 
    std::set<int, std::less<int>, std::allocator<int>  >
        all (a1+0, a1+10),
        even (a2+0, a2+6),
        odd;
 
    // Create an insert_iterator for odd.
    std::insert_iterator<std::set <int, std::less<int>, std::allocator<int> > >
        odd_ins (odd, odd.begin ());
 
    // Demonstrate set_difference.
    typedef std::ostream_iterator<int, char, std::char_traits<char> > Iter;
 
    std::cout << "The result of:\n{";
 
    std::copy (all.begin (), all.end (), Iter (std::cout, " "));
    std::cout << "} - {";
 
    std::copy (even.begin (), even.end (), Iter (std::cout, " "));
    std::cout << "} =\n{";
 
    std::set_difference (all.begin (), all.end (),
                         even.begin (), even.end (),
                         odd_ins);
 
    std::copy (odd.begin (),odd.end (), Iter (std::cout," "));
    std::cout << "}\n\n";
 
    return 0;
}