/* File : example.c */

#include "example.h"
#include <math.h>
#ifndef M_PI
#  define M_PI 3.14159265358979323846
#endif

/* Move the shape to a new location */
void Shape::move(double dx, double dy) {
  x += dx;
  y += dy;
}

int Shape::nshapes = 0;

double Circle::area(void) {
  return M_PI*radius*radius;
}

double Circle::perimeter(void) {
  return 2*M_PI*radius;
}

double Square::area(void) {
  return width*width;
}

double Square::perimeter(void) {
  return 4*width;
}

double do_op(Shape *s, double (Shape::*m)(void)) {
  return (s->*m)();
}

double (Shape::*areapt())(void) {
  return &Shape::area;
}

double (Shape::*perimeterpt())(void) {
  return &Shape::perimeter;
}

/* Member pointer variables */
double (Shape::*areavar)(void) = &Shape::area;
double (Shape::*perimetervar)(void) = &Shape::perimeter;