PyObject の基礎: ソースコード

rect.c

#include <stdio.h>

struct rect {
	int height;
	int width;
	void (*rotate)(struct rect *);
};

void rect_rotate(struct rect *);

void rect_init(struct rect *self)
{
	self->height = 0;
	self->width = 0;
	self->rotate = *rect_rotate;
}

void rect_rotate(struct rect *self)
{
	int tmp = self->height;
	self->height = self->width;
	self->width = tmp;
}

int main(void)
{
	struct rect r;
	rect_init(&r);
	r.height = 3;
	r.width = 4;

	printf("height: %d, width: %d\n", r.height, r.width);
	
	r.rotate(&r);

	printf("height: %d, width: %d\n", r.height, r.width);
	return 0;
}

rect.py

class Rect(object):
    def __init__(self):
        self.height = 0
        self.width = 0

    def rotate(self):
        self.height, self.width = self.width, self.height

rect = Rect()
rect.height = 3
rect.width = 4

print('height: {0.height}, width: {0.width}'.format(rect))

rect.rotate()

print('height: {0.height}, width: {0.width}'.format(rect))