#include <iostream>
#include <map>

template<class T>
void f(std::map<int, T>::value_type& v)
{
    std::cout << v.first << v.second << std::endl;
}

int main()
{
    std::map<int, int> m;
    m[0] = 2;
    f<int>(*m.begin());

    return 0;
}