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/* Soot - a J*va Optimization Framework
 * Copyright (C) 1997-1999 Raja Vallee-Rai
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.

 * Modified by the Sable Research Group and others 1997-1999.  
 * See the 'credits' file distributed with Soot for the complete list of
 * contributors.  (Soot is distributed at http://www.sable.mcgill.ca/soot)

package soot;

/** An alternate equivalence relation
 * between objects.  The standard interpretation will be structural
 * equality.  We also demand that if x.equivTo(y), then x.equivHashCode() == 
 * y.equivHashCode. */
public interface EquivTo
    /** Returns true if this object is equivalent to o. */
    public boolean equivTo(Object o);

    /** Returns a (not necessarily fixed) hash code for this object.
     * This hash code coincides with equivTo; it is undefined in the
     * presence of mutable objects. */
    public int equivHashCode();
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