bug628.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 18 行

object Test {
  abstract class Unit
  object NoUnit extends Unit
  object Hour extends Unit

  case class Measure(scalar: Double, unit: Unit) {
    def *(newUnit: Unit): Measure = Measure(scalar, newUnit)
  }

  implicit def double2Measure(scalar: Double) =
    Measure(scalar, NoUnit)


  def main(args: Array[String]): scala.Unit = {
    Console.println("3.0 * Hour = " + (3.0 * (Hour: Unit)))
  }
}