?? memberrefcount.hpp
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/* 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; }};
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