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/**
* @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
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