109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/**
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* @file lleventemitter.h
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* @brief General event emitter class
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*
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* $LicenseInfo:firstyear=2005&license=viewergpl$
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*
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* Copyright (c) 2005-2009, Linden Research, Inc.
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*
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* Second Life Viewer Source Code
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* The source code in this file ("Source Code") is provided by Linden Lab
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* to you under the terms of the GNU General Public License, version 2.0
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* ("GPL"), unless you have obtained a separate licensing agreement
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* ("Other License"), formally executed by you and Linden Lab. Terms of
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* the GPL can be found in doc/GPL-license.txt in this distribution, or
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* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution, or
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* online at
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* http://secondlifegrid.net/programs/open_source/licensing/flossexception
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*
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* By copying, modifying or distributing this software, you acknowledge
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* that you have read and understood your obligations described above,
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* and agree to abide by those obligations.
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*
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* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
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* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
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* COMPLETENESS OR PERFORMANCE.
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* $/LicenseInfo$
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*/
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// header guard
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#ifndef LL_EVENTEMITTER_H
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#define LL_EVENTEMITTER_H
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// standard headers
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#include <algorithm>
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#include <typeinfo>
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#include <iostream>
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#include <string>
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#include <list>
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#include "stdtypes.h"
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///////////////////////////////////////////////////////////////////////////////
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// templatized emitter class
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template < class T >
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class eventEmitter
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{
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public:
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typedef typename T::EventType EventType;
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typedef std::list< T* > ObserverContainer;
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typedef void ( T::*observerMethod )( const EventType& );
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protected:
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ObserverContainer observers;
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public:
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eventEmitter () { };
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~eventEmitter () { };
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///////////////////////////////////////////////////////////////////////////////
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//
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BOOL addObserver ( T* observerIn )
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{
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if ( ! observerIn )
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return FALSE;
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// check if observer already exists
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if ( std::find ( observers.begin (), observers.end (), observerIn ) != observers.end () )
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return FALSE;
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// save it
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observers.push_back ( observerIn );
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return true;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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BOOL remObserver ( T* observerIn )
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{
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if ( ! observerIn )
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return FALSE;
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observers.remove ( observerIn );
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return TRUE;
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};
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///////////////////////////////////////////////////////////////////////////////
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//
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void update ( observerMethod method, const EventType& msgIn )
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{
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typename std::list< T* >::iterator iter = observers.begin ();
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while ( iter != observers.end () )
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{
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( ( *iter )->*method ) ( msgIn );
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++iter;
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};
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};
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};
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#endif // lleventemitter_h
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