/*
 * Copyright (c) 1995, 1996 Gunther Schadow.  All rights reserved.
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef _ANYSEG_H_
#define _ANYSEG_H_

#pragma interface

#include <PGObject.h>
#include <Segment.h>
#include <SegTypeCode.h>
#include <fBitSet.h>

class ANYseg : public PGObject
{
  BitSet _allowed;
  Segment *_seg;
  bool  _frozen;

 public:
  ANYseg();
  ANYseg(const BitSet&);
  ANYseg(const ANYseg&);
  ~ANYseg();

  const ANYseg&  operator =        (const Segment&);
  const ANYseg&  operator =        (const ANYseg&);

  Segment* const operator ->       () const;
  Segment&       operator *        () const;
                 operator Segment& () const;

  Segment *seg();
  void freeze(bool flag = true);
  bool frozen();

  void unset();
  bool ispresent() const;
  SegTypeCode::Value type() const;

  result input(istream&);
  void   output(ostream&) const;

  bool OK() const;
  bool commit();

  BitSet allowed();
  void reallow(const BitSet&);
  void allow(SegTypeCode::Value);
  void allow();  // allow all
  void forbid(SegTypeCode::Value);
  void forbid(); // forbid all
};

#ifndef OUTLINE
# include "ANYseg.icc"
#endif

#endif /* ! _ANYSEG_H_ */