/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * 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. */#include <functional>#include <cmath>template <class T1, class T2>         struct fopow : public std::binary_function<T1, T2, T1>{    T1 operator() (T1 base, T2 exp) const {        return std::pow(base,exp);    }};