cmake_demo/library/circle.h

#ifndef _CIRCLE_H_
#define _CIRCLE_H_

#include "common.h"
#include "shape.h"

struct _circle
{
    int invalid;

    // super
    struct _shape *shape;

    // attribute
    double radius;

    // method
    // void (*area)(void *self);
    // void (*draw)(void *self);
};

struct _circle *circle_new(double radius);

double circle_area(void *self, void *parent);
void circle_draw(void *self, void *parent);

#endif