Function Templates

#include <iostream>

template <typename T>
T max (T x, T y)
{
  return (x > y) ? x : y;
}

int main() {

  std::cout << max(10, 20) << std::endl;
  std::cout << max('a', 'y') << std::endl;

  return 0;
}

Template Classes

#include <iostream>

template <typename T>
class Adder
{
public:
  Adder();
  T add (T x, T y);
};

template <typename T> Adder<T>::Adder() {
  // constructor here
}

template <typename T> T Adder<T>::add(T x, T y) {
  return x + y;
}


int main() {
  
  Adder<double> d;
  std::cout << d.add (1.11, 1.11) << std::endl;

  Adder<std::string> s;
  std::cout << s.add("hello ", "world") << std::endl;

  return 0;
}