001    
002    package lrs.visitor;
003    
004    import lrs.*;
005    /**
006     * Abstract class for comparison operations for selection sort.
007     */
008    public abstract class AGetExtrema implements IAlgo {
009     public abstract Object emptyCase(LRStruct host, Object... param);
010     public abstract Object nonEmptyCase(LRStruct host, Object... param);
011    }
012