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Only the Java Core part of Javolution library, with slight modifications for use in MSFTBX.

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/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.util.function;

import java.util.Iterator;

/**
 *  A function iterating over a collection.
 * 
 *  Except for {@link Mutable} instances, iterations are not 
 *     allowed to modify the collection iterated.
 * 
 * @author Jean-Marie Dautelle
 * @version 6.0, July 21, 2013
 */
public interface Iteration  {

    public interface Mutable extends Iteration {}
    public interface Sequential extends Iteration {}
       
     /** 
     * Runs the iteration using the specified iterator.
     */
    void run(Iterator it);
  
 }