point.r

Object-Oriented Programming With ANSI-C这本书中的源代码!找了很久

#ifndef	POINT_R
#define	POINT_R

#include "Object.r"

struct Point { const struct Object _;	/* Point : Object */
	int x, y;				/* coordinates */
};

#define	x(p)	(((const struct Point *)(p)) -> x)
#define	y(p)	(((const struct Point *)(p)) -> y)

void super_draw (const void * class, const void * self);

struct PointClass {
	const struct Class _;			/* PointClass : Class */
	void (* draw) (const void * self);
};

#endif