The following code example is taken from the book
Object-Oriented Programming in C++
by Nicolai M. Josuttis, Wiley, 2002
© Copyright Nicolai M. Josuttis 2002
#include "coord.hpp"
// common abstract base class GeoObj for geometric objects
class GeoObj {
public:
// draw geometric object:
virtual void draw() const = 0;
// return position of geometric object:
virtual Coord position() const = 0;
//...
};
// concrete geometric object class Circle
// - derived from GeoObj
class Circle : public GeoObj {
public:
virtual void draw() const;
virtual Coord position() const;
//...
};
// concrete geometric object class Line
// - derived from GeoObj
class Line : public GeoObj {
public:
virtual void draw() const;
virtual Coord position() const;
//...
};
//...