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: "Gerriet M. Denkmann" <email@hidden>
- Date: Tue, 22 Oct 2013 15:02:39 +0700
On 22 Oct 2013, at 14:48, ChanMaxthon <email@hidden> wrote:
> 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.
>
非常感谢
Works perfectly now.
(I still would like to know whether my code was faulty, or whether this is a compiler bug)
Kind regards
Gerriet.
>> 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?
>>
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