> I'm not sure, but from what I've read, I believe the non-underscore version is only for use in Obj-C declarations (methods, properties), where the double-underscore is for C declarations, including functions and variables (local, global, or, I would expect, instance).
>
> I don't know why there would be an issue with multiple levels of pointers in a method declaration. Perhaps when everyone's recovered from WWDC, someone else will chime in to help out. :-)
That's how I understood it as well. Basically, nullable/nonnull is invalid outside of a method declaration. However, it seems that it's also invalid in something like
- (void)foo: (nullable id*)foo;
as that gives:
error: nullability keyword 'nullable' cannot be applied to
multi-level pointer type 'id *'
If you do
- (void)foo: (id *nullable)foo;
it gets confused:
error: expected ')'
But both work fine with __nullable. Maybe a bug?
Oh, another very nasty thing I noticed:
glibc also uses __nullable, but it takes a parameter. This means it's not possible to write portable code that uses __nullable :/. Maybe it would be wiser to just make nullable without the __ a keyword and not have __nullable and nullable?
--
Jonathan
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