/** * @file lleventemitter.h * @brief General event emitter class * * $LicenseInfo:firstyear=2005&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ // 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