#include <iostream>
using namespace std;

template <typename T,
          typename = std::enable_if_t<std::is_arithmetic<T>::value, T>>
class Foo {
  T x, y;

public:
  Foo() {
    cout << "x: ";
    cin >> x;
    cout << "y: ";
    cin >> y;
  }

  ~Foo() { cout << "Destructor called, nothing to do here."; }

  T mx() { return (x > y ? x : y); };
};

int main() {
  Foo<float> bar;

  cout << bar.mx() << endl;

  return 0;
}