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Scala example source code file (Combinators.scala)

This example Scala source code file (Combinators.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

boolean, boolean, combinators, combinators, killactorcontrol, killactorcontrol, unit, unit

The Scala Combinators.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2005-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

// $Id$

package scala.actors

private[actors] trait Combinators {

  /**
   * Enables the composition of suspendable closures using `andThen`,
   * `loop`, `loopWhile`, etc.
   */
  implicit def mkBody[a](body: => a): Actor.Body[a]

  /**
   * Repeatedly executes `body`.
   *
   * @param body the block to be executed
   */
  def loop(body: => Unit): Unit = body andThen loop(body)

  /**
   * Repeatedly executes `body` while the condition `cond` is `true`.
   *
   * @param cond the condition to test
   * @param body the block to be executed
   */
  def loopWhile(cond: => Boolean)(body: => Unit): Unit =
    if (cond) { body andThen loopWhile(cond)(body) }
    else continue

  /**
   * Continues with the execution of the closure registered as
   * continuation following `andThen`. Continues with the execution
   * of the next loop iteration when invoked inside the body of `loop`
   * or `loopWhile`.
   */
  def continue(): Unit = throw new KillActorControl

}

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