単位変換する何かを作りたかったが、どうも微妙なのでボツ

unit_converter.scala

case class Base(n: BigDecimal) {
  def toMicro: Micro = Micro(n * 1000000)
}
case class Micro(n: BigDecimal) {
  def toBase: Base = Base(n / 1000000)
}

sealed abstract class Converter[From, To] extends (From => To)
object Converter {
  def apply[A, B](a: A)(implicit c: Converter[A, B]): B = c(a)

  implicit val base2micro = new Converter[Base, Micro] { def apply(a: Base): Micro = a.toMicro  }
  implicit val micro2base = new Converter[Micro, Base] { def apply(a: Micro): Base = a.toBase }
}

locally {
  val from = Micro(1000000)
  val to = Converter[Micro, Base](from)
  println(s"${from} => ${to}")
}
locally {
  val from = Base(1)
  val to = Converter[Base, Micro](from)
  println(s"${from} => ${to}")
}