?? dynahier.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. */#include "coord.hpp"// common abstract base class GeoObj for geometric objectsclass GeoObj { public: // draw geometric object: virtual void draw() const = 0; // return center of gravity of geometric object: virtual Coord center_of_gravity() const = 0; //...};// concrete geometric object class Circle// - derived from GeoObjclass Circle : public GeoObj { public: virtual void draw() const; virtual Coord center_of_gravity() const; //...};// concrete geometric object class Line// - derived from GeoObjclass Line : public GeoObj { public: virtual void draw() const; virtual Coord center_of_gravity() const; //...};//...
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