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/**
*
*/
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);
}
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