/* If your actor is getting more complex, you probably want to implement it as a class instead,
* as we do here for the sender actors. The main behavior goes into operator()() of the class.
*
* You can then directly start your actor, as follows: */
/* If your actor is getting more complex, you probably want to implement it as a class instead,
* as we do here for the sender actors. The main behavior goes into operator()() of the class.
*
* You can then directly start your actor, as follows: */