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: Luther Baker <email@hidden>
- Date: Thu, 11 Aug 2011 18:36:16 -0500
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)
{
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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