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diff --git a/src/id_object.h b/src/id_object.h
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+++ b/src/id_object.h
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+/*
+    Copyright (C) 2005-2009  Michel de Boer <michel@twinklephone.com>
+
+    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
+*/
+
+/**
+ * @file
+ * Objects with a unique object id.
+ */
+
+#ifndef _ID_OBJECT_H
+#define _ID_OBJECT_H
+
+#include "threads/mutex.h"
+
+/**
+ * Object identifier.
+ */
+typedef unsigned short		t_object_id;
+
+/**
+ * Parent class for objects that need a unique object id.
+ */
+class t_id_object {
+private:
+	/** Mutex for concurrent object id creation. */
+	static t_mutex		mtx_next_id;
+	
+	/** Id for the next object. */
+	static t_object_id	next_id;
+	
+	/** Unique object identifier. */
+	t_object_id		id;
+	
+public:
+	/** Constructor */
+	t_id_object();
+	
+	/** 
+	 * Get the object id.
+	 * @return Object id.
+	 */
+	t_object_id get_object_id();
+	
+	/**
+	 * Generate a new object identifier. This can be useful
+	 * after making a copy of an object.
+	 */
+	void generate_new_id();
+};
+
+#endif