/* 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 ObjectT,        // the class type containing the counter         typename CountT,         // the type of the pointer         CountT ObjectT::*CountP> // the location of the counterclass MemberReferenceCount{  public:    // the default constructor and destructor are fine    // initialize the counter to one:    void init (ObjectT* object) {        object->*CountP = 1;    }    // no action is needed to dispose of the counter:    void dispose (ObjectT*) {    }    // increment by one:    void increment (ObjectT* object) {        ++object->*CountP;    }        // decrement by one:    void decrement (ObjectT* object) {        --object->*CountP;    }    // test for zero:    template<typename T> bool is_zero (ObjectT* object) {        return object->*CountP == 0;    }};