packable_tree.h

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#ifndef PACKABLE_TREE_CLASS
#define PACKABLE_TREE_CLASS

/*****************************************************************************\
*                                                                             *
*  Name   : packable_tree                                                     *
*  Author : Chris Koeritz                                                     *
*                                                                             *
*******************************************************************************
* Copyright (c) 1992-$now By Author.  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 is online at:      *
*     http://www.fsf.org/copyleft/gpl.html                                    *
* Please send any updates to: fred@gruntose.com                               *
\*****************************************************************************/

#include "tree.h"

#include <basis/packable.h>

namespace nodes {

// forward.
class packable_tree_factory;


class packable_tree : public tree, public packable
{
public:
  packable_tree();

  virtual ~packable_tree();

  void recursive_pack(byte_array &packed_form) const;
  
  static packable_tree *recursive_unpack(byte_array &packed_form,
           packable_tree_factory &creator);

  // these pack and unpack methods must be implemented by the derived tree.

  virtual void pack(byte_array &packed_form) const = 0;

  virtual bool unpack(byte_array &packed_form) = 0;

private:
  static void packit(byte_array &packed_form,
          const packable_tree *current_node);
};


class packable_tree_factory
{
public:
  virtual ~packable_tree_factory();
  virtual packable_tree *create() = 0;

};

} // namespace.

#endif

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