AudioDecoder problems under ARC

[indragiek]

AudioDecoder's methods for setting callbacks uses a void* parameter for the context. This construct isn't supported under Objective-C ARC so it won't compile (I'm not talking about compiling SFBAudioEngine under ARC, just using AudioDecoder in my own ARC-compiled code).

[sbooth]

I haven't yet used ARC, but I think you can work around this problem by using objc_unretainedObject and objc_unretainedPointer:

// To set the callback
decoder->SetDecodingStartedCallback(decodingStarted, objc_unretainedPointer(self));
// In the callback
id me = objc_unretainedObject(context);

[indragiek]

Thanks for the reply, using objc_unretainedObject gives me "Cannot initialize a parameter of type 'void *' with an rvalue of type 'objc_objectptr_t'"

[sbooth]

Until Xcode 4.2 is officially released I don't think I'll be much help with this, because I don't have it installed yet.

[sbooth]

One other thought- objc_objectptr_t is a typedef for const void *. Did you try explicitly casting context to const void * in the call to objc_unretainedObject?

[sbooth]

Yet another idea, and I think this may be the correct answer:

// To set the callback
decoder->SetDecodingStartedCallback(decodingStarted, (__bridge void *)self);
// In the callback
id me = (__bridge id)context;

[indragiek]

The last solution seems to have done the trick :) This might be worth a note in the README.