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diff --git a/intern/container/CTR_TaggedIndex.h b/intern/container/CTR_TaggedIndex.h
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+/**
+ * $Id$
+ * ***** BEGIN GPL/BL DUAL 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. The Blender
+ * Foundation also sells licenses for use in proprietary software under
+ * the Blender License.  See http://www.blender.org/BL/ for information
+ * about this.
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
+ * All rights reserved.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): none yet.
+ *
+ * ***** END GPL/BL DUAL LICENSE BLOCK *****
+ */
+
+/**
+
+ * $Id$
+ * Copyright (C) 2001 NaN Technologies B.V.
+ * Simple tagged index class.
+ */
+
+#ifndef NAN_INCLUDED_CTR_TaggedIndex_h
+#define NAN_INCLUDED_CTR_TaggedIndex_h
+
+/**
+ * This class is supposed to be a simple tagged index class. If these
+ * were indices into a mesh then we would never need 32 bits for such indices.
+ * It is often handy to have a few extra bits around to mark objects etc. We
+ * steal a few bits of CTR_TaggedIndex objects for this purpose. From the outside
+ * it will behave like a standard unsigned int but just carry the extra tag
+ * information around with it.
+ */
+
+#include <functional>
+
+enum {
+
+	empty_tag = 0x0,
+	empty_index = 0xffffffff
+};
+
+template <
+	int tag_shift, 
+	int index_mask
+> class CTR_TaggedIndex {
+public:
+	CTR_TaggedIndex(
+	) : 
+		m_val ((empty_tag << tag_shift) | (empty_index & index_mask))
+	{
+	}
+
+	CTR_TaggedIndex(
+		const int val
+	) :
+		m_val ((val & index_mask) | ((empty_tag << tag_shift) & (~index_mask))) {
+	}
+
+	CTR_TaggedIndex(
+		const unsigned int val
+	) :
+		m_val ((val & index_mask) | ((empty_tag << tag_shift) & (~index_mask))) {
+	}
+
+	CTR_TaggedIndex(
+		const long int val
+	) :
+		m_val ( ((long int) val & index_mask)
+				| ( (empty_tag << tag_shift)
+					& (~index_mask)) ) {
+	}
+
+	CTR_TaggedIndex(
+		const long unsigned int val
+	) :
+		m_val ( ((long unsigned int)val & index_mask)
+				| ( (empty_tag << tag_shift)
+					& (~index_mask) ) ) {
+	}
+
+
+	CTR_TaggedIndex(
+		const CTR_TaggedIndex &my_index
+	):
+		m_val(my_index.m_val)
+	{
+	}
+
+		bool 
+	operator == (
+		const CTR_TaggedIndex& rhs
+	) const {
+
+		return ((this->m_val & index_mask) == (rhs.m_val & index_mask));
+	}		
+
+	operator unsigned int () const {
+		return m_val & index_mask;
+	}
+
+	operator unsigned long int () const {
+		return (unsigned long int)(m_val & index_mask);
+	}
+
+	operator int () const {
+		return int(m_val & index_mask);
+	}
+
+	operator long int () const {
+		return (long int)(m_val & index_mask);
+	}
+
+		bool
+	IsEmpty(
+	) const {
+		return ((m_val & index_mask) == (empty_index & index_mask));
+	}
+
+
+	static
+		CTR_TaggedIndex
+	Empty(
+	) {
+		return CTR_TaggedIndex();
+	}
+
+		void
+	Invalidate(
+	) {
+		m_val = (empty_tag << tag_shift) | (empty_index & index_mask);
+	}
+
+
+		unsigned int 
+	Tag (
+	) const {
+		return m_val >> tag_shift;
+	}
+	
+		void
+	SetTag(
+		unsigned int tag
+	) {
+		m_val = (m_val & index_mask) | ((tag << tag_shift) & (~index_mask));
+	}
+
+		void
+	EmptyTag(
+	) {
+		m_val = (m_val & index_mask) | ((empty_tag << tag_shift) & (~index_mask));
+	}
+
+		bool
+	IsEmptyTag(
+	) const {
+		return (Tag() == Empty().Tag());
+	}
+	
+	// functionals 
+
+	struct greater : std::binary_function<CTR_TaggedIndex, CTR_TaggedIndex, bool>
+	{
+			bool 
+		operator()(
+			const CTR_TaggedIndex& a,
+			const CTR_TaggedIndex& b
+		) const {
+			return (int(a) > int(b));
+		}
+	};
+	
+	
+private :
+	CTR_TaggedIndex(
+		const CTR_TaggedIndex *index
+	) {}; 
+
+	unsigned int m_val;
+
+
+};			
+
+
+#endif
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