/*
 * 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 PG_CODE_H_
#define PG_CODE_H_

#include <pg_config.h>

#pragma interface

#include <Primtype.h>

class Code : public Primtype
{
 protected:
  Code();

 public:
  virtual result input(istream& is);
  virtual void   output(ostream& os) const;

  virtual operator const char *() const = 0;

  virtual bool operator == (const char*) const;
  virtual bool operator != (const char*) const;
  virtual bool operator == (const Code&) const;
  virtual bool operator != (const Code&) const;

 protected:
  // a pure virtual function needed in input()  
  virtual void set(const char *) = 0;
  virtual void set();
};

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

#endif /* !PG_CODE_H_ */