#include <iostream>
#include <vector>

using namespace std;

class Num{
  public:
    int i;
    Num(){i=0;}
    Num(int v){i = v;}

};

int main() {
  std::cout << "Iterating containers that use a class\n";

  vector<Num> v = {Num(1), Num(2), Num(3), Num(4)}; // calls our Num constructor 4 times

  for(auto iter = v.begin(); iter != v.end(); iter++){
    cout << iter->i << ", ";
  }

}