Re: confused by what seems to be a recursive declaration/definition
Re: confused by what seems to be a recursive declaration/definition
- Subject: Re: confused by what seems to be a recursive declaration/definition
- From: William Squires <email@hidden>
- Date: Thu, 11 Aug 2011 21:26:21 -0500
On Aug 11, 2011, at 6:36 PM, Luther Baker wrote:
> I see.
>
> In this case, it is passed in as the context of a KVO registration ... and
> as such, it facilitates a direct equality test in the KVO handler.
>
> - (void)observeValueForKeyPath:(NSString*)path ofObject:(id)object change:(
> NSDictionary*)change *context:(void*)context* {
> if (context == AVPlayerDemoPlaybackViewControllerRateObservationContext)
> {
>
I believe you have two erroneous '*'s in there! '*context:' doesn't make sense as part of a method signature in ObjC, and there shouldn't be an asterisk after 'context' but before the opening '{' (an '*' comes before an identifier (variable name), not after it; unless you're multiplying, which doesn't apply here)!
Or were you trying to highlight the section of text, "context:(void *)context"? In which case, perhaps '*'s weren't the best choice for ObjC code, eh?
> Thanks!
> -Luther
>
>
> On Thu, Aug 11, 2011 at 6:26 PM, Jens Alfke <email@hidden> wrote:
>
>>
>> On Aug 11, 2011, at 4:10 PM, Luther Baker wrote:
>>
>> static void *AVPlayerDemoPlaybackViewControllerRateObservationContext = &
>> AVPlayerDemoPlaybackViewControllerRateObservationContext;
>>
>>
>> It’s initializing the variable to point to itself. Which seems sort of
>> pointless, but I don’t know the context.
>>
>> Isn't the right side evaluated first? But it doesn't yet exist? It compiles
>> ... but seems to be a recursive definition??
>>
>>
>> The right side is evaluated first at runtime, but it doesn’t access the
>> value of the variable, only its address, the address of the variable is
>> already known.
>>
>> —Jens
>>
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