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diff --git a/source/blender/freestyle/intern/system/Id.h b/source/blender/freestyle/intern/system/Id.h
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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_ID_H__
+#define __FREESTYLE_ID_H__
+
+/** \file blender/freestyle/intern/system/Id.h
+ *  \ingroup freestyle
+ *  \brief Identification system
+ *  \author Emmanuel Turquin
+ *  \date 01/07/2003
+ */
+
+/*! Class used to tag any object by an id.
+ *  It is made of two unsigned integers.
+ */
+class Id
+{
+public:
+	typedef unsigned id_type;
+
+	/*! Default constructor */
+	Id()
+	{
+		_first = 0;
+		_second = 0;
+	}
+
+	/*! Builds an Id from an integer.
+	 *  The second number is set to 0.
+	 */
+	Id(id_type id)
+	{
+		_first = id;
+		_second = 0;
+	}
+
+	/*! Builds the Id from the two numbers */
+	Id(id_type ifirst, id_type isecond)
+	{
+		_first = ifirst;
+		_second = isecond;
+	}
+
+	/*! Copy constructor */
+	Id(const Id& iBrother)
+	{
+		_first = iBrother._first;
+		_second = iBrother._second;
+	}
+
+	/*! Operator= */
+	Id& operator=(const Id& iBrother)
+	{
+		_first = iBrother._first;
+		_second = iBrother._second;
+		return *this;
+	} 
+
+	/*! Returns the first Id number */
+	id_type getFirst() const
+	{
+		return _first;
+	}
+
+	/*! Returns the second Id number */
+	id_type getSecond() const
+	{
+		return _second;
+	}
+
+	/*! Sets the first number constituing the Id */
+	void setFirst(id_type first)
+	{
+		_first = first;
+	}
+
+	/*! Sets the second number constituing the Id */
+	void setSecond(id_type second)
+	{
+		_second = second;
+	}
+
+	/*! Operator== */
+	bool operator==(const Id& id) const
+	{
+		return ((_first == id._first) && (_second == id._second));
+	}
+
+	/*! Operator!= */
+	bool operator!=(const Id& id) const
+	{
+		return !((*this) == id);
+	}
+
+	/*! Operator< */
+	bool operator<(const Id& id) const
+	{
+		if (_first < id._first)
+			return true;
+		if (_first == id._first && _second < id._second)
+			return true;
+		return false;
+	}
+
+private:
+	id_type _first;
+	id_type _second;
+};
+
+// stream operator
+inline std::ostream& operator<<(std::ostream& s, const Id& id)
+{
+	s << "[" << id.getFirst() << ", " << id.getSecond() << "]";
+	return s;
+}
+
+# endif // __FREESTYLE_ID_H__