/* 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. */template<typename T>class AccumulationTraits;template<>class AccumulationTraits<char> {  public:    typedef int AccT;    static AccT zero() {        return 0;    }};template<>class AccumulationTraits<short> {  public:    typedef int AccT;    static AccT zero() {        return 0;    }};template<>class AccumulationTraits<int> {  public:    typedef long AccT;    static AccT zero() {        return 0;    }};template<>class AccumulationTraits<unsigned int> {  public:    typedef unsigned long AccT;    static AccT zero() {        return 0;    }};template<>class AccumulationTraits<float> {  public:    typedef double AccT;    static AccT zero() {        return 0;    }};//...