/*
 * 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_SEGMENT_H_
#define PG_SEGMENT_H_

#include <pg_config.h>

#pragma interface

#include <Structure.h>
#include <Type.h>
#include <SegTypeCode.h>
#include <iostream.h>

class Segment : public Structure
{
 public:

  static bool pedantic;

  SegTypeCode::Value /* int */ type() const;
  virtual void unset();
  virtual bool OK() const;

  virtual bool commit();
  
  virtual result input(istream&);
  virtual void   output(ostream&) const;

  /*
   * input and output of segment header (tag)
   */
  
  result input_header(istream& is);
  void   output_header(ostream& os) const;
  static SegTypeCode::Value peek(istream&);  

  /* This operator is experimental! Use it with care, since it gives
   * direct access to variable members.
   */
  Type& operator [] (unsigned int);

 protected:

  const bool required = TRUE;
  const bool optional = FALSE;

  struct fielddesc {
    Type Segment::* memberp;   // was: int   offset;
    bool  required;
    const char *name;
  };

  Segment(SegTypeCode::Value type, int nf, fielddesc *ft);

 private:
  unsigned int nofields;
  fielddesc *fieldtab;
};

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

#endif /* !PG_SEGMENT_H_ */