// @(#)$Id: BoundedStackInterface.jml,v 1.6 2005/07/08 18:13:39 leavens Exp $

// Copyright (C) 1998, 1999 Iowa State University

// This file is part of JML

// JML is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.

// JML 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 General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with JML; see the file COPYING.  If not, write to
// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

package org.jmlspecs.samples.stacks;
//@ refine "BoundedStackInterface.java";

public interface BoundedStackInterface extends BoundedThing {
  /*@ also
    @ implies_that
    @   public behavior
    @     requires !theStack.isEmpty();
    @     assignable size, theStack;
    @     ensures theStack.equals(\old(theStack.trailer()));
    @     signals (java.lang.Exception) false;
    @  also
    @   public behavior
    @     requires theStack.isEmpty();
    @     assignable \nothing;
    @     ensures false;
    @     signals_only BoundedStackException;
    @     signals (java.lang.Exception) true;
    @*/
  public void pop( ) throws BoundedStackException;
}