meta/pow3.hpp

The following code example is taken from the book
C++ Templates - The Complete Guide
by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
© Copyright David Vandevoorde and Nicolai M. Josuttis 2002


#ifndef POW3_HPP
#define POW3_HPP

// primary template to compute 3 to the Nth
template<int N>
class Pow3 {
  public:
    enum { result = 3 * Pow3<N-1>::result };
};

// full specialization to end the recursion
template<>
class Pow3<0> {
  public:
    enum { result = 1 };
};

#endif // POW3_HPP