#ifndef APPLICATION_LAYER_H #define APPLICATION_LAYER_H #include <boost/shared_ptr.hpp> #include "communication_layer.hpp" class ApplicationLayer : public CommunicationLayer { friend class AppEpochEvent; public:    typedef boost::shared_ptr<ApplicationLayer> ApplicationLayerPtr;    virtual ~ApplicationLayer();    virtual ApplicationLayerPtr thisApplicationLayer() = 0;    void start(const SimTime& startTime);    void stop(const SimTime& stopTime);    bool recvFromLayer(CommunicationLayer::Directions direction,       PacketPtr packet, t_uint sendingLayerIdx);    inline CommunicationLayer::Types getLayerType() const; protected:    ApplicationLayer(NodePtr node);    virtual bool handleRecvdPacket(PacketPtr packet,       t_uint sendingLayerIdx) = 0;    virtual void startHandler() = 0;    virtual void stopHandler() = 0;    bool m_isRunning; private: }; typedef boost::shared_ptr<ApplicationLayer> ApplicationLayerPtr; // Inline Functions inline CommunicationLayer::Types ApplicationLayer::getLayerType() const {    return CommunicationLayer::Types_Application; } // Overloaded Operators // Event Subclasses class AppEpochEvent : public Event { public:    typedef boost::shared_ptr<AppEpochEvent> AppEpochEventPtr;    enum Epochs {       Epochs_Start,       Epochs_Stop    };    static inline AppEpochEventPtr create(Epochs epochType,       ApplicationLayerPtr appLayer)    {       AppEpochEventPtr p(new AppEpochEvent(epochType, appLayer));       return p;    }    void execute()    {       switch(m_epochType) {       case Epochs_Start:          m_appLayer->m_isRunning = true;          m_appLayer->startHandler();          break;       case Epochs_Stop:          m_appLayer->stopHandler();          m_appLayer->m_isRunning = false;          break;       default:          assert(0);       }    } protected:    AppEpochEvent(Epochs epochType, ApplicationLayerPtr appLayer)       : Event()    {       m_epochType = epochType;       m_appLayer = appLayer;    } private:    Epochs m_epochType;    ApplicationLayerPtr m_appLayer; }; typedef boost::shared_ptr<AppEpochEvent> AppEpochEventPtr; #endif // APPLICATION_LAYER_H