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+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2010 Blender Foundation.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __FREESTYLE_BASE_ITERATOR_H__
+#define __FREESTYLE_BASE_ITERATOR_H__
+
+/** \file blender/freestyle/intern/system/BaseIterator.h
+ *  \ingroup freestyle
+ *  \brief Classes defining the basic "Iterator" design pattern
+ *  \author Stephane Grabli
+ *  \date 18/03/2003
+ */
+
+#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