/**
 *
 */
package de.fhswf.in.inf.upnfx.util;


/**
 * An interface for on UPN operator.
 *
 * @author $Author: $
 * @version $Revision: $, $Date: $ UTC
 */
public interface Operator
{
   /**
    * Gets a stack of doubles and calculates a new value to be put on the
    * stack.
    *
    * @param upnStack
    *           The UPN stack of the calculator.
    */
   void eval(ObservableDoubleStack upnStack);
}