point.c

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

#include <stdio.h>

#include "Point.h"
#include "Point.r"
#include "new.h"
#include "new.r"

static void * Point_ctor (void * _self, va_list * app)
{	struct Point * self = _self;

	self -> x = va_arg(* app, int);
	self -> y = va_arg(* app, int);
	return self;
}

static void Point_draw (const void * _self)
{	const struct Point * self = _self;

	printf("\".\" at %d,%d\n", self -> x, self -> y);
}

static const struct Class _Point = {
	sizeof(struct Point), Point_ctor, 0, Point_draw
};

const void * Point = & _Point;

void move (void * _self, int dx, int dy)
{	struct Point * self = _self;

	self -> x += dx, self -> y += dy;
}