ObjFW  Diff

	[element retain];

	objc_autoreleasePoolPop(pool);

	return [element autorelease];
}

- (OFSet *)setBySubtractingSet: (OFSet *)set
{
	OFMutableSet *new = [[self mutableCopy] autorelease];
	[new minusSet: set];
	[new makeImmutable];
	return new;
}

- (OFSet *)setByIntersectingWithSet: (OFSet *)set
{
	OFMutableSet *new = [[self mutableCopy] autorelease];
	[new intersectSet: set];
	[new makeImmutable];
	return new;
}

- (OFSet *)setByAddingSet: (OFSet *)set
{
	OFMutableSet *new = [[self mutableCopy] autorelease];
	[new unionSet: set];
	[new makeImmutable];
	return new;
}