Method: List#cycle

Defined in:

ext/list/list.c

#cycle(*args) ⇒ Object

# File 'ext/list/list.c', line 2332

static VALUE
list_cycle(int argc, VALUE *argv, VALUE self)
{
	VALUE nv = Qnil;
	item_t *c;
	long n;

	RETURN_SIZED_ENUMERATOR(self, argc, argv, list_cycle_size);
	rb_scan_args(argc, argv, "01", &nv);

	if (NIL_P(nv)) {
		n = -1;
	} else {
		n = NUM2LONG(nv);
		if (n <= 0) return Qnil;
	}

	while (0 < LIST_LEN(self) && (n < 0 || 0 < n--)) {
		LIST_FOR(self, c) {
			rb_yield(c->value);
			if (list_empty_p(self)) break;
		}
	}
	return Qnil;
}