timer implementation

I hope that you don’t need to implement a timer.

Refer the code of routing protocols such as DSR. There you may find the usage of a timer.

For example, in DSR, you will find this timer code in DSRAgent.h

class SendBufferTimer : public TimerHandler {

public:

SendBufferTimer(DSRAgent *a) : TimerHandler() { a_ = a;}

void expire(Event *e);

protected:

DSRAgent *a_;

};