Re: Arc: Switch case is in protected scope
Re: Arc: Switch case is in protected scope
- Subject: Re: Arc: Switch case is in protected scope
- From: ChanMaxthon <email@hidden>
- Date: Tue, 22 Oct 2013 15:48:45 +0800
Just put a set of braces after every case: and it should be okay. A set of braces here actually sets up a mini stack frame that makes ARC work.
Sent from my iPhone
> On 2013年10月22日, at 15:41, "Gerriet M. Denkmann" <email@hidden> wrote:
>
> Converting to Arc (Xcode 5.0).
>
> This works fine without Arc (regardless whether TRIGGER_ERROR is defined or not):
>
> NSMutableString *mus = [ NSMutableString string ];
> NSString *word = @"abc";
>
> switch( self.colourType )
> {
> case colour_link:
> [ mus appendString: @"<a href=\"" ];
> #define TRIGGER_ERROR
> #ifdef TRIGGER_ERROR
> NSString *urlStr = [ word stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding ];
> [ mus appendString: urlStr ];
> #else // no_ERROR
> [ mus appendString: [ word stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding ] ];
> #endif // no_ERROR
>
> break;
>
> default:
> [ mus appendString: word ];
> };
>
> But with Arc, if TRIGGER_ERROR is defined, I get an error: "Switch case is in protected scope" with the further explanation: "Jump bypasses initialization of retaining variable".
>
>
> Was the old (non-arc) code faulty (but the compiler did not notice this)?
> Why is the arc-version (with TRIGGER_ERROR defined) wrong?
>
> Gerriet.
>
>
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