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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
package backend
import scala.collection.mutable
* Simple implementation of a worklist algorithm. A processing
* function is applied repeatedly to the first element in the
* worklist, as long as the stack is not empty.
* The client class should mix-in this class and initialize the worklist
* field and define the `processElement` method. Then call the `run` method
* providing a function that initializes the worklist.
* @author Martin Odersky
* @version 1.0
* @see [[]]
trait WorklistAlgorithm {
type Elem
type WList = mutable.Stack[Elem]
val worklist: WList
* Run the iterative algorithm until the worklist remains empty.
* The initializer is run once before the loop starts and should
* initialize the worklist.
def run(initWorklist: => Unit) = {
while (worklist.nonEmpty)
* Process the current element from the worklist.
def processElement(e: Elem): Unit
* Remove and return the first element to be processed from the worklist.
def dequeue: Elem
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