interval to double

I have:
- a packet counter
- an interval
- a threshold of packet per second.

When I multiplie the interval with the threshold the result is an interval.
I want to compare the result with the counter (of count type).

Is there a converter (interval->count/int) or a smarter way to do it?

Ouch, no, there's no real way to do this. Probably the easiest solution
would be to add interval<->double converters. This is actually simple
to do, if you look in at how bro_to_net is defined and exported,
and do the analogous operations.