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diff --git a/synfig-core/tags/synfig_0_61_06/src/synfig/uniqueid.h b/synfig-core/tags/synfig_0_61_06/src/synfig/uniqueid.h
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+/* === S Y N F I G ========================================================= */
+/*!	\file uniqueid.h
+**	\brief Template Header
+**
+**	$Id$
+**
+**	\legal
+**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+**	This package 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 package 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.
+**	\endlegal
+*/
+/* ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SYNFIG_UNIQUEID_H
+#define __SYNFIG_UNIQUEID_H
+
+/* === H E A D E R S ======================================================= */
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+namespace synfig {
+
+class UniqueIDLessThan;
+
+/*! \class UniqueID
+**	\brief \todo
+*/
+class UniqueID
+{
+	friend class UniqueIDLessThan;
+
+	int id_;
+
+	explicit UniqueID(int id_):id_(id_) { }
+
+	static int next_id();
+
+public:
+
+	//! Returns the internal unique identifier for this object.
+	/*! The return value from this isn't really useful for
+	**	much other than debug output. Nonetheless, that is
+	**	one step above useless, so here it is. */
+	const int &get_uid()const { return id_; }
+
+	UniqueID():id_(next_id()) { }
+
+	void make_unique() { id_=next_id(); }
+
+	static const UniqueID nil() { return UniqueID(0); }
+
+	operator bool()const { return static_cast<bool>(id_); }
+
+	void mimic(const UniqueID& x) { id_=x.id_; }
+
+	bool operator==(const UniqueID &rhs)const { return id_==rhs.id_; }
+	bool operator!=(const UniqueID &rhs)const { return id_!=rhs.id_; }
+	bool operator<(const UniqueID &rhs)const { return id_<rhs.id_; }
+}; // END of class UniqueID
+
+/*! \class UniqueIDLessThan
+**	\brief A function class used for sorting based on UniqueIDs
+*/
+class UniqueIDLessThan
+{
+public:
+	bool operator()(const UniqueID &lhs, const UniqueID &rhs)const
+	{ return lhs.id_<rhs.id_; }
+};
+
+
+}; // END of namespace synfig
+
+/* === E N D =============================================================== */
+
+#endif