agenovese

    abstract class Strategy[T, V]() {
      def doSomething(x: Int): V
      def unDoSomething(x: V): T
    }

    class StrategyOne() extends Strategy[Int, String] {
      def doSomething(x: Int): String = {"..."}
      def unDoSomething(x: String): Int = {1}
    }