mgorny added a comment.

In D100418#2689348 <https://reviews.llvm.org/D100418#2689348>, @labath wrote:

> I've been thinking about whether this should be done here, or via a separate 
> multiplexer entity. It's not clear to me which one is cleaner so I suppose we 
> can go with what you have done here.
>
> That said, I'm not too happy about this callback_id business. IIUC, it's only 
> there to enable removing a specific callback (because you can't have a set of 
> std::functions). But there are other ways to achieve that, and they don't 
> leak this detail to the users. One option would be to hold the callbacks in a 
> std::list, and use the (stable) iterator as the ID....
>
> It could also use a test... something like, register a callback, fire a 
> signal and check it's called, registers a second callback and check that both 
> are called, unregister the first one and check that only the second one is 
> called, ...

Hmm, my first though was to use a `static int` that increases with every call. 
But the `std::list` idea is interesting, so I'll explore that.


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https://reviews.llvm.org/D100418

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