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/**
* @file lleventemitter.h
* @brief General event emitter class
*
* $LicenseInfo:firstyear=2005&license=viewergpl$
*
* Copyright (c) 2005-2008, 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
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