Scala ARM

arm.scala

    import scala.language.reflectiveCalls

    def using[TResource <: { def close(): Unit }, TResult](resource: => TResource)(action: TResource => TResult): TResult = {
        val instance = resource
        try {
            action(instance)
        } finally {
            instance.close()
        }
    }

    def manage[TResource <: { def close(): Unit }](resource: => TResource): Traversable[TResource] = new Traversable[TResource] {
        override def foreach[TResult](action: TResource => TResult): Unit = {
            val instance = resource
            try {
                action(instance)
            } finally {
                instance.close()
            }
        }
    }

    class Resource {
        scala.Console.out.println("Opening...")

        def close() {
            scala.Console.out.println("Closing...")
        }
    }

    using (new Resource) { r =>

    }

    for (r <- manage(new Resource)) {
    }