1

我正在尝试编写一个toFirstOrSecond方法,该方法允许我在没有任何额外代码的情况下调用 Try。

object A:
  enum FirstOrSecond[+V]:

    case First(x: V) extends FirstOrSecond[V]

    case Second(e : Throwable) extends FirstOrSecond[V]

    def map[Q](f: V ⇒ Q): FirstOrSecond[Q] =
      this match
        case FirstOrSecond.Second(e)  ⇒ FirstOrSecond.Second(e)
        case FirstOrSecond.First(v)   ⇒ Try { FirstOrSecond.First(f(v)) }.toFirstOrSecond match 
                    case FirstOrSecond.First(m)    => FirstOrSecond.First(f(v))
                    case FirstOrSecond.Second(m)   => FirstOrSecond.Second(m) 

  object Try:
    def toFirstOrSecond[Q](f: Try[Q]): FirstOrSecond[Q] =
      f match
        case Failure(e) => FirstOrSecond.First(e)
        case Success(v) => FirstOrSecond.Second(v)

但我得到一个错误我该object Try in object A does not take parameters如何解决这个问题?谢谢

4

0 回答 0