/* 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 ACCUM_HPP#define ACCUM_HPP#include <iterator>template <typename Iter>inlinetypename std::iterator_traits<Iter>::value_type accum (Iter start, Iter end){    typedef typename std::iterator_traits<Iter>::value_type VT;    VT total = VT();  // assume VT() actually creates a zero value    while (start != end) {        total += *start;        ++start;    }    return total;}#endif // ACCUM_HPP