Iterator.hpp

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/*
 * Copyright (C) 2004  Andrew Sutton
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to:
 *
 * The Free Software Foundation, Inc.
 * 59 Temple Place, Suite 330
 * Boston, MA  02111-1307  USA
 *
 * Contact:
 *   Andrew Sutton  asutton@cs.kent.edu
 */

#ifndef OMF_ITERATOR_HPP
#define OMF_ITERATOR_HPP

// std includes
#include <list>
#include <set>
#include <map>

namespace OMF
{
  // forward declarations
  class Object;
  class List;
  class Set;

  class Iterator
  {
    friend class List;
    friend class Set;

  protected:
    typedef std::list<Object *>::iterator ListIterator;
    typedef std::set<Object *>::iterator SetIterator;
    typedef std::map<unsigned, Object *>::iterator MapIterator;

    enum Mode {
      None,
      List,
      Set,
      Map
    };

  public:
    Iterator();
    Iterator(const Iterator &i);
    Iterator(const ListIterator &i);
    Iterator(const SetIterator &i);
    Iterator(const MapIterator &i);

    const Iterator &operator =(const Iterator &i);
    const Iterator &operator =(const ListIterator &i);
    const Iterator &operator =(const SetIterator &i);
    const Iterator &operator =(const MapIterator &i);

    Object *operator *();
    Object *operator ->();

    Iterator &operator ++();
    Iterator operator ++(int);
    Iterator &operator --();
    Iterator operator --(int);

    bool operator ==(const Iterator &i);
    bool operator !=(const Iterator &i);

  private:
    Mode    _mode;    
    ListIterator  _iList;   
    SetIterator   _iSet;    
    MapIterator   _iMap;    
  };
}

#endif

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