// @(#)$Id: Number.jml,v 1.7 2005/07/07 21:03:10 leavens Exp $

// Copyright (C) 2005 Iowa State University
//
// This file is part of the runtime library of the Java Modeling Language.
//
// 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
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with JML; see the file LesserGPL.txt.  If not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
// 02110-1301  USA.

package java.lang;

/** JML's specification of java.lang.Number.
 * @version $Revision: 1.7 $
 * @author Brandon Shilling
 * @author Gary T. Leavens
 */
public abstract class Number implements java.io.Serializable {

    /*@ public normal_behavior
      @   assignable objectState;
      @*/
    public /*@ pure @*/ Number();

    /*@ public normal_behavior
      @   ensures (* \result is an int approximation
      @              to the value of this object *);
      @*/
    public abstract /*@ pure @*/ int intValue();

    /*@ public normal_behavior
      @   ensures (* \result is an long approximation
      @              to the value of this object *);
      @*/
    public abstract /*@ pure @*/ long longValue();

    /*@ public normal_behavior
      @   ensures (* \result is an float approximation
      @              to the value of this object *);
      @*/
    public abstract /*@ pure @*/ float floatValue();

    /*@ public normal_behavior
      @   ensures (* \result is an double approximation
      @              to the value of this object *);
      @*/
    public abstract /*@ pure @*/ double doubleValue();

    /*@ public normal_behavior
      @   ensures (* \result is an byte approximation
      @              to the value of this object *);
      @*/
    public /*@ pure @*/ byte byteValue();

    /*@ public normal_behavior
      @   ensures (* \result is an short approximation
      @              to the value of this object *);
      @*/
    public /*@ pure @*/ short shortValue();
}