makeOption that takes an argument 'a' and returns Some(a) if 'a' is not of type Option and 'a' itself otherwise?

gistfile1.scala

  trait AsOption[T] {

    type Out <: Option[_]

    def apply(x: T): Out

  }


  trait LowPriorityAsOption {

    implicit def wrapAsOption[T]: AsOption[T] = new AsOption[T] { type Out = Option[T]; def apply(x: T) = Some(x) }

  }


  object AsOption extends LowPriorityAsOption  {

    implicit def optionIsAlreadyOption[T <: Option[_]]: AsOption[T] = new AsOption[T] { type Out = T; def apply(x: T) = x }

    def apply[T](x: T)(implicit asOpt: AsOption[T]): asOpt.Out = asOpt(x)

  }

Kevin Wright

//Later, in the REPL...

scala> val bibble = 42
bibble: Int = 42

scala> val boop = "Hi Mum!"
boop: String = Hi Mum!

scala> val yeehaw = Some(180)
yeehaw: Some[Int] = Some(180)

scala> AsOption(bibble)
res3: asOpt.Out = Some(42)

scala> AsOption(boop)
res4: asOpt.Out = Some(Hi Mum!)

scala> AsOption(yeehaw)
res5: asOpt.Out = Some(180)

Not an Any in sight!