reactiveComponent.scala

trait ReactiveComponent[Input, Output]

trait SimpleTransformation[Input, Output] extends ReactiveComponent[Input, Output] {
  val outer = this
  def update(input: Input):  Output

  def conn[Output1](nextSimpleTrans: SimpleTransformation[Output, Output1]): SimpleTransformation[Input, Output1] = {
    new SimpleTransformation[Input, Output1] {
      override def update(input: Input): Output1 = {
        val output: Output = outer.update(input) //outer.update return's Output1 type?
        nextSimpleTrans.update(output)
      }
    }
  }
}