Expose subscriber and publisher counts

[Edholm]

Would it be possible to add functions for getting the subscriber/publisher count from a subscription/publisher? Or maybe it is possible already, but I missed it? 🤔

It looks like this functionality exists (see here).

My goal is to be able to write lazy publishers, that doesn't actually publish anything unless there are subscribed subscribers. Very useful for expensive computations that could be avoided if no one is listening in on the other side.

Cheers!

[lassilaiho]

We will add the feature into our backlog but it is currently not our top priority.

[lassilaiho]

This is now implemented.