llmediaemitter.h

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// header guard
#ifndef llmediaemitter_h
#define llmediaemitter_h

// standard headers
#include <algorithm>
#include <typeinfo>
#include <iostream>
#include <list>

#include "stdtypes.h"

//      templatized emitter class
template < class T >
class LLMediaEmitter
{
        public:
                typedef typename T::EventType EventType;
                typedef std::list< T* > ObserverContainer;
                typedef void ( T::*observerMethod )( const EventType& );

        protected:
                ObserverContainer observers;

        public:
                LLMediaEmitter()
                {
                };

                ~LLMediaEmitter()
                {
                };

                //
                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 // llmediaemitter_h

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