T12 - zad.3.

#include <iostream>
#include <cmath>
#include <set>

template <typename T>
std::set<T> operator+(const std::set<T> &s1, const std::set<T> &s2)
{
    std::set<int> s3;
        for (auto iter1(s1.begin()); iter1!=s1.end(); iter1++)
            s3.insert(*iter1);
        for (auto iter2(s2.begin()); iter2!=s2.end(); iter2++)
            s3.insert(*iter2);
    return s3;
}

template <typename T>
std::set<T> operator*(const std::set<T> &s1, const std::set<T> &s2)
{
    std::set<int> s3;
        for (auto iter1(s1.begin()); iter1!=s1.end(); iter1++)
        {
            for (auto iter2(s2.begin()); iter2!=s2.end(); iter2++)
            {
                if (*iter1==*iter2)
                s3.insert(*iter1);
            }
        }
    return s3;
}


template <typename T>
std::ostream &operator<<(std::ostream &tok, std::set<T> skup)
{
    tok<<"{";
    for (auto iter(skup.begin()); iter!=skup.end(); iter++)
    tok<<*iter<<",";
    tok<<'\b'<<"}"; //na kraju umjesto zareza upisi zatvorenu viticastu zagradu
    return tok;
}