Thank you for the update on that sample code. I was hoping it would continue to be ignored because I was publicly berated in the #macdev channel for posting it, but oh well. Thanks to Wolf's post up there, I'm not going to continue to learn SB any longer, and I just hope Apple fixes it up.
On Mon, Mar 3, 2008 at 12:32 AM, Jens Alfke <[EMAIL PROTECTED]> wrote: > > On 2 Mar '08, at 4:54 AM, Steven Degutis wrote: > > > I think it's clear why [currentTrack > > isKindOfClass:[iTunesFileTrack class]] evaluates to true: in the > > previous line, you defined it as such, like this: > > iTunesTrack *currentTrack = [iTunes currentTrack]; > > So obviously it is an iTunesTrack! > > No. It could be an instance of a subclass of iTunesTrack, such as (in > this case) iTunesFileTrack. (That's true of any object-oriented > language.) > > > > Try this: > > iTunesFileTrack *currentTrack = [iTunesFileTrack currentTrack]; > > That won't even compile. You can't assign an iTunesTrack* to an > iTunesFileTrack*. > > Moreover, since Obj-C is a dynamic language, it's more important what > the class of the object is at runtime, than what type the pointers are > defined as at compile time. You can change the type declarations, but > it won't affect what actual objects you get back at runtime. > > —Jens
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