> there was no listener known with this id). This can be used for statistics:
>
> id = setlistener("/sim/signals/quit", func {}); # let's not count this one
> num = removelistener(id);
>
> print("there were ", id, " Nasal listeners attached since fgfs was
> started");
> print("of which ", num, " are still active");
Very nice. Kinda like the fd arithmetic in UNIX, with the classic dup()
tricks! :-)
Vassilii
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