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okapies/gist:7182102

Last active December 26, 2015 16:48
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Value type as Sum types
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gistfile1.scala
// value class
class Param(val i: Int) extends AnyVal
implicit def asParam(i: Int) = Param(i)
// followings are invalid because `Param` is a final class.
case class AnyParam(_i: Int) extends Param(_i)
case object ConstantA extends Param(-1)
case object ConstantB extends Param(0)
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