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/* File : example.h */
class Shape {
public:
Shape() {
nshapes++;
}
virtual ~Shape() {
nshapes--;
};
double x, y;
double *z;
void move(double dx, double dy);
virtual double area(void) = 0;
virtual double perimeter(void) = 0;
static int nshapes;
};
class Circle : public Shape {
private:
double radius;
public:
Circle(double r) : radius(r) { };
virtual double area(void);
virtual double perimeter(void);
};
class Square : public Shape {
private:
double width;
public:
Square(double w) : width(w) { };
virtual double area(void);
virtual double perimeter(void);
};
extern double do_op(Shape *s, double (Shape::*m)(void));
/* Functions that return member pointers */
extern double (Shape::*areapt())(void);
extern double (Shape::*perimeterpt())(void);
/* Global variables that are member pointers */
extern double (Shape::*areavar)(void);
extern double (Shape::*perimetervar)(void);
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