/* 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)template <int N, int LO=1, int HI=N>class Sqrt {  public:    // compute the midpoint, rounded up    enum { mid = (LO+HI+1)/2 };    // search a not too large value in a halved interval    enum { result = (N<mid*mid) ? Sqrt<N,LO,mid-1>::result                                : Sqrt<N,mid,HI>::result };};// partial specialization for the case when LO equals HItemplate<int N, int M>class Sqrt<N,M,M> {  public:    enum { result = M };};#endif // SQRT_HPP