/* example of using GCC anonymous structures and unions to do quick bitfields */

#include <stdio.h>
#include <string.h>

struct foo {
	union {
		struct {
			unsigned x:1;
			unsigned y:1;
			unsigned z:1;
		}; 
		unsigned long n; /* TODO: a sizeof of the struct could make an array */
	};
};

void dump_foo(struct foo *foo) {
	printf("x:%d y:%d z:%d\n", foo->x, foo->y, foo->z);
}

int main() {
	struct foo mask, foo;
	foo.n=0; /* initialize */

	/** create some set **/
	foo.x=0;
	foo.y=1;
	foo.z=1;

	printf("original: ");
	dump_foo(&foo);

	/** make a mask **/
	mask.n=0; /* initialize */
	mask.x=1;
	mask.y=0;
	mask.z=1;

	printf("mask    : ");
	dump_foo(&mask);

	/** apply the mask **/
	foo.n&=mask.n;
	printf("final   : ");
	dump_foo(&foo);

	return 0;
}