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puffnfresh/Caster.scala

Last active February 27, 2016 12:40
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Caster.scala
sealed trait Caster[A, B]
case object CastTo extends Caster[Unit, Unit]
case class Ignored[A, B]() extends Caster[A, B]
def cast[A, B]: A =:= B =
(Ignored(): Caster[A, B]) match {
case CastTo | _ => implicitly[B =:= Unit]
}
cast[String, Int]: String =:= Int
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