Add custom resource disposal to RACDisposable

[jspahrsummers]

Maybe through a public -addDisposeBlock: method on RACDisposable.

For instance, I would like to retain the GCD semaphore in firstOrDefault:success:error:, and have it be released only when the subscribable is completely torn down.

[alanjrogers]

This sounds like a good idea. On a related note, does a RACDisposable dispose itself when it is deallocated?

[jspahrsummers]

@alanjrogers RACScopedDisposable does – vanilla RACDisposable does not.

[joshaber]

I'm not entirely convinced this is necessary. Conceptually the disposable returned from -subscribe: encapsulates all the logic necessary to clean up that subscription. So it seems odd to be able to "add" to that. More typically, you'd just create a new disposable that does your custom work and disposes of the other disposable.

-first... (and -toArray) are a bit of a weird case that I don't think should drive our decisions.

And there are all the advantages of RACDisposable being immutable.

[jspahrsummers]

👍 I don't know why composition didn't occur to me.