template_class.cpp

#include <iostream>
using namespace std;

template <class T>
int get_age(T obj) {
  return obj.age;
}

class Person {
public:
  int age;
};

class Tree {
public:
  int age;
};

int main() {
  Person p;
  Tree t;
  p.age = 10;
  t.age = 1000;
  cout << get_age(p) << endl;
  cout << get_age(t) << endl;
  return 0;
}