/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#ifndef SQRT_HPP#define SQRT_HPP// primary template to compute sqrt(N) via iterationtemplate <int N, int I=1>class Sqrt {  public:    enum { result = (I*I<N) ? Sqrt<N,I+1>::result                            : I };};// partial specialization to end the iterationtemplate<int N>class Sqrt<N,N> {  public:    enum { result = N };};#endif // SQRT_HPP