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diff --git a/linden/indra/llcommon/lleventemitter.h b/linden/indra/llcommon/lleventemitter.h
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+/** 
+ * @file lleventemitter.h
+ * @brief General event emitter class
+ *
+ * Copyright (c) 2005-2007, Linden Research, Inc.
+ * 
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlife.com/developers/opensource/gplv2
+ * 
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlife.com/developers/opensource/flossexception
+ * 
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ * 
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ */
+
+// header guard
+#ifndef LL_EVENTEMITTER_H
+#define LL_EVENTEMITTER_H
+
+// standard headers
+#include <algorithm>
+#include <typeinfo>
+#include <iostream>
+#include <string>
+#include <list>
+
+#include "stdtypes.h"
+
+///////////////////////////////////////////////////////////////////////////////
+//      templatized emitter class
+template < class T >
+class eventEmitter
+{
+        public:
+                typedef typename T::EventType EventType;
+                typedef std::list< T* > ObserverContainer;
+                typedef void ( T::*observerMethod )( const EventType& );
+
+        protected:
+                ObserverContainer observers;
+
+        public:
+                eventEmitter () { };
+
+                ~eventEmitter () { };
+
+                ///////////////////////////////////////////////////////////////////////////////
+                //
+                BOOL addObserver ( T* observerIn )
+                {
+                        if ( ! observerIn )
+                                return FALSE;
+
+                        // check if observer already exists
+                        if ( std::find ( observers.begin (), observers.end (), observerIn ) != observers.end () )
+                                return FALSE;
+
+                        // save it
+                        observers.push_back ( observerIn );
+
+                        return true;
+                };
+
+                ///////////////////////////////////////////////////////////////////////////////
+                //
+                BOOL remObserver ( T* observerIn )
+                {
+                        if ( ! observerIn )
+                                return FALSE;
+
+                        observers.remove ( observerIn );
+
+                        return TRUE;
+                };
+
+                ///////////////////////////////////////////////////////////////////////////////
+                //
+                void update ( observerMethod method, const EventType& msgIn )
+                {
+                        typename std::list< T* >::iterator iter = observers.begin ();
+
+                        while ( iter != observers.end () )
+                        {
+                                ( ( *iter )->*method ) ( msgIn );
+
+                                ++iter;
+                        };
+                };
+};
+
+#endif // lleventemitter_h