set_union.cpp

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#include <algorithm>
#include <set>
#include <iostream>
#include <iterator>
 
int main ()
{
    typedef std::set<int, std::less<int>, std::allocator<int> > Set;
 
    // Initialize sets.
    const int a1[] = { 2, 4, 6, 8, 10, 12 };
    const int a2[] = { 3, 5, 7, 8 };
 
    const Set s1 (a1, a1 + sizeof a1 / sizeof *a1);
    const Set s2 (a2, a2 + sizeof a2 / sizeof *a2);
 
    Set result;
 
    // Create an insert_iterator for result.
    std::insert_iterator<Set> res_ins (result, result.begin ());
 
    // Compute union of two sets.
    std::set_union (s2.begin (), s2.end (), s1.begin (), s1.end (), res_ins);
 
    // Display result on standard output.
    typedef std::ostream_iterator<int, char, std::char_traits<char> > OSIter;
 
    std::cout << "The result of:\n{ ";
 
    std::copy (s2.begin (),s2.end (), OSIter (std::cout," "));
 
    std::cout << "} union { ";
 
    std::copy (s1.begin (),s1.end (), OSIter (std::cout," "));
 
    std::cout << "} =\n{ ";
 
    std::copy (result.begin (),result.end (), OSIter (std::cout," "));
 
    std::cout << "}\n\n";
 
    return 0;
}