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/**
* @file lleventemitter.h
* @brief General event emitter class
*
* Copyright (c) 2005-$CurrentYear$, Linden Research, Inc.
* $License$
*/
// 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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