Re: when __bridge isn't required
Re: when __bridge isn't required
- Subject: Re: when __bridge isn't required
- From: Tom Davie <email@hidden>
- Date: Sat, 27 Jul 2013 21:05:32 +0200
The first gives me the following error:
Implicit conversion of Objective-C pointer type 'NSString *' to C pointer type 'CFStringRef' (aka 'const struct __CFString *') requires a bridged cast
Tom Davie
On Jul 27, 2013, at 8:31 PM, Matt Neuburg <email@hidden> wrote:
> I feel like I've asked this before, but I don't feel I'm grasping the answer. Why don't these work the same way under ARC:
>
> NSString* answer = @"42";
> int ans = CFStringGetIntValue((CFStringRef)answer);
>
> and
>
> NSURL* imageSource = [NSURL new];
> CGImageSourceRef src =
> CGImageSourceCreateWithURL((CFURLRef)imageSource, nil);
>
> The first one compiles (with no explicit __bridge). The second one doesn't; you must say __bridge explicitly. But why? They look completely parallel to me.
>
> The mystery is compounded by the fact that if you omit the cast entirely in the first example, the compiler claims that you need a bridged cast. But you don't; you just need a cast. That feels like a bug; if a mere cast is sufficient, the compiler should say so (and Fix-It should offer it as a possible fix).
>
> m.
>
> --
> matt neuburg, phd = email@hidden, http://www.apeth.net/matt/
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