alias R = Region!(int, int); alias TI = R.TaggedInterval; assert((TI(0, 10, 20) & TI(0, 0, 5)).empty); assert((TI(0, 10, 20) & TI(0, 5, 15)) == TI(0, 10, 15)); assert((TI(0, 10, 20) & TI(0, 12, 18)) == TI(0, 12, 18)); assert((TI(0, 10, 20) & TI(0, 10, 20)) == TI(0, 10, 20)); assert((TI(0, 10, 20) & TI(0, 15, 25)) == TI(0, 15, 20)); assert((TI(0, 10, 20) & TI(0, 25, 30)).empty); assert((TI(0, 10, 20) & TI(1, 25, 30)).empty);
Returns the intersection of both intervals; empty if tags differ.