bug1220.scala

来自「JAVA 语言的函数式编程扩展」· SCALA 代码 · 共 15 行

object Test extends Application {
  class QSRichIterable[A](self:Iterable[A]) {
     def filterMap[R](f: PartialFunction[A,R]) = 
       self filter (f.isDefinedAt) map f
  }

  object Un {
     def unapply(i:int): Option[int] = Some(i)
  }

  val richIter = new QSRichIterable(List(0, 1, 2, 3, 4))

  assert((richIter filterMap {case Un(3) => 7}) == List(7))
}