Operations on arbitrary value types

public T Add(T val1, T val2)
{
   return val1 + val2;
}

public T Add(T val1, T val2)
{
   //Num<T> defines a '+' operation which returns a value of type T
   return (new Num<T>(val1) + new Num<T>(val2));
}

template < class T >
T add(T const & val1, T const & val2)
{
    return val1 + val2;
}

template <typename T>
T Add(T val1, T val2)
{
  return val1 + val2;
}

#define ADD(A,B) (A+B)

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