> On Feb 11, 2015, at 11:55 PM, Roland King <[email protected]> wrote:
>
> I’m guessing it’s
> __has_feature( nullability )
That works — thanks!
So the magic invocation I’m putting in my header files (after the #includes) is:
#if __has_feature(nullability) // Xcode 6.3+
#pragma clang assume_nonnull begin
#else
#define nullable
#define __nullable
#endif
… interface declarations go here…
#if __has_feature(nullability)
#pragma clang assume_nonnull end
#endif
In property declarations you'll need to make “nullable” the last
meta-attribute, otherwise you’ll get syntax errors in earlier versions of
Xcode; so for example “(readonly, nonatomic, nullable)” works but “(readonly,
nullable, nonatomic)” is a syntax error because in Xcode 6.1 the parser will
see two adjacent commas.
[This is working well, but in converting my interfaces I found a nasty compiler
bug that I’m about to submit to Apple — if you declare multiple properties on a
single line, adding the (nullable) attribute will cause the parser to lock up
in an infinite loop:
@property (readonly, nullable) id a, b, c; // don’t do this!
I spent an hour or so with my MBP’s fan running full speed before figuring out
which exact line triggered this.]
—Jens _______________________________________________
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