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sealed trait IntegralNumber
sealed trait FiniteNumber extends IntegralNumber
object IntegralNumber {
sealed abstract class BaseNumber extends IntegralNumber
sealed abstract class NonFinite extends BaseNumber
object NaN extends NonFinite
sealed abstract class FiniteNumberImpl[N](val value: N) extends BaseNumber with FiniteNumber
sealed class IntNumber(value: Int) extends FiniteNumberImpl[Int](value)
def test(t: IntNumber, o: IntegralNumber) = o match {
case NaN => -1
case o: IntNumber => t.value.compare(o.value)
}
}
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