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MinCha/unary.scala

Created September 11, 2015 06:59
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Scala Unary
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unary.scala
sealed abstract class AdviceGrade {
def unary_!(): AdviceGrade
}
case object VeryGood extends AdviceGrade {
override def unary_!(): AdviceGrade = Bad
}
case object Good extends AdviceGrade {
override def unary_!(): AdviceGrade = Good
}
case object Bad extends AdviceGrade {
override def unary_!(): AdviceGrade = VeryGood
}
!Bad -> VeryGood
!Good -> Good
!VeryGood -> Bad
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