dynahier.hpp

The following code example is taken from the book
C++ Templates - The Complete Guide, 2nd Edition
by David Vandevoorde, Nicolai M. Josuttis, and Douglas Gregor,
Addison-Wesley, 2017
© Copyright David Vandevoorde, Nicolai M. Josuttis, Douglas Gregor 2017


#include "coord.hpp"

// common abstract base class GeoObj for geometric objects
class GeoObj {
  public:
    // draw geometric object:
    virtual void draw() const = 0;
    // return center of gravity of geometric object:
    virtual Coord center_of_gravity() const = 0;
    //...
    virtual ~GeoObj() = default;
};

// concrete geometric object class Circle
// - derived from GeoObj
class Circle : public GeoObj {
  public:
    virtual void draw() const override;
    virtual Coord center_of_gravity() const override;
    //...
};

// concrete geometric object class Line
// - derived from GeoObj
class Line : public GeoObj {
  public:
    virtual void draw() const override;
    virtual Coord center_of_gravity() const override;
    //...
};
//...