lleventemitter.h
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- /**
- * @file lleventemitter.h
- * @brief General event emitter class
- *
- * $LicenseInfo:firstyear=2005&license=viewergpl$
- *
- * Copyright (c) 2005-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * 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://secondlifegrid.net/programs/open_source/licensing/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://secondlifegrid.net/programs/open_source/licensing/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.
- * $/LicenseInfo$
- */
- // 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