implicit conversion of an Objective-C pointer to 'void *' is disallowed with ARC

Question

What does this mean and what alternative do I have?

implicit conversion of an Objective-C pointer to \'void *\' is disallowed with ARC

I

Answer 1

You can't do implicit casts to void* anymore, AudioSessionInitialize(NULL, NULL, NULL, objc_unretainedPointer(self)); should do the trick.

EDIT: Historical point, the answer above was from before the __bridge casts were finalized. In modern code the correct answer is that provided by @KazukiSakamoto, AudioSessionInitialize(NULL, NULL, NULL, (__bridge void*)self);