/** * @file lleventemitter.h * @brief General event emitter class * * $LicenseInfo:firstyear=2005&license=viewergpl$ * * Copyright (c) 2005-2009, 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