#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

// bez =int
template <typename typ>
struct Gruszka
{

    // brakuje () i.e. operator () (args..)
    void operator ()(const typ x) const
    {
        cout << 2*x << endl;
    }
};

int main()
{
    vector <int> myVec;
    myVec.push_back(5);
    myVec.push_back(12);
    myVec.push_back(521);
    myVec.push_back(9);

    vector <int>::iterator it;

    for(it = myVec.begin(); it!= myVec.end();it++)
    {
        cout << *it << endl;
    }

    for_each(myVec.begin(),myVec.end(),Gruszka <int>());
    //                                          ^int
    return 0;
}