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TwoLengthString

Scala

Last updated at 2018-07-20Posted at 2012-12-26

object HList {
  sealed trait HList

  final class HNil extends HList {
    def ::[T](v : T) = HCons(v, this)
  }

  val HNil = new HNil()

  final case class HCons[H, T <: HList](head : H, tail : T) extends HList {
    def ::[T](v : T) = HCons(v, this)
  }

  type ::[H, T <: HList] = HCons[H, T]

  type TwoLengthString = Char :: Char :: HNil

  implicit def stringToTwoLengthString(s:String) = { 
    s.head :: s.last :: HNil
  }
}

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