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+//
+//  Filename         : BaseIterator.h
+//  Author(s)        : Stephane Grabli
+//  Purpose          : Classes defining the basic "Iterator" design pattern
+//  Date of creation : 18/03/2003
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef  BASEITERATOR_H
+# define BASEITERATOR_H
+
+# include <iterator>
+
+// use for iterators defintions
+template <class Element>
+class Nonconst_traits;
+
+template <class Element>
+class Const_traits {
+public:
+  typedef Element value_type;
+  typedef const Element&  reference;
+  typedef const Element*  pointer;
+  typedef ptrdiff_t       difference_type;
+  typedef Nonconst_traits<Element> Non_const_traits;
+};
+
+template <class Element>
+class Nonconst_traits {
+public:
+  typedef Element value_type;
+  typedef Element& reference;
+  typedef Element* pointer;
+  typedef ptrdiff_t       difference_type;
+  typedef Nonconst_traits<Element> Non_const_traits;
+};
+
+class InputIteratorTag_Traits {
+public:
+  typedef std::input_iterator_tag iterator_category;
+};
+
+class BidirectionalIteratorTag_Traits {
+public:
+  typedef std::bidirectional_iterator_tag iterator_category;
+};
+
+template<class Traits, class IteratorTagTraits>
+class IteratorBase
+{
+public:
+
+  virtual ~IteratorBase() {}
+
+  virtual bool begin() const = 0;
+  virtual bool end() const = 0;
+
+  typedef typename IteratorTagTraits::iterator_category     iterator_category;
+  typedef typename Traits::value_type                       value_type;
+  typedef typename Traits::difference_type                  difference_type;
+  typedef typename Traits::pointer                          pointer;
+  typedef typename Traits::reference                        reference;
+
+protected:
+
+  IteratorBase() {}
+};
+
+#endif // BASEITERATOR_H