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 LOOP2_HPP
#define LOOP2_HPP
// primary template
template <int DIM, typename T>
class DotProduct {
public:
static T result (T* a, T* b) {
return *a * *b + DotProduct<DIM-1,T>::result(a+1,b+1);
}
};
// partial specialization as end criteria
template <typename T>
class DotProduct<1,T> {
public:
static T result (T* a, T* b) {
return *a * *b;
}
};
// convenience function
template <int DIM, typename T>
inline T dot_product (T* a, T* b)
{
return DotProduct<DIM,T>::result(a,b);
}
#endif // LOOP2_HPP