/* 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. */#include <stddef.h>template <typename CountedType>class ObjectCounter {  private:    static size_t count;    // number of existing objects  protected:    // default constructor    ObjectCounter() {         ++ObjectCounter<CountedType>::count;    }    // copy constructor    ObjectCounter (ObjectCounter<CountedType> const&) {        ++ObjectCounter<CountedType>::count;     }    // destructor    ~ObjectCounter() {         --ObjectCounter<CountedType>::count;    }  public:    // return number of existing objects:    static size_t live() {         return ObjectCounter<CountedType>::count;     }};// initialize counter with zerotemplate <typename CountedType>size_t ObjectCounter<CountedType>::count = 0;