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CFRunLoopTimerCallBack by reference?

I need to dispatch a lot of CFRunLoop timers with callbacks to several different functions. I'd like to write a single dispatch function that can specify the callback by *reference* rather than by name. I've never seen this done. Is it possible?

For example:

char* callbackRef = "myCallback";

CFRunLoopTimerRef timer = CFRunLoopTimerCreate (
/* CFAllocatorRef allocator */ kCFAllocatorDefault,
/* CFAbsoluteTime fireDate */ CFAbsoluteTimeGetCurrent() + delay,
/* CFTimeInterval interval */ 0, // 0 = fire once then invalidate
/* CFOptionFlags flags */ 0,
/* CFIndex order */ 0,
/* CFRunLoopTimerCallBack callout */ callbackRef, //----- nooooo way!
/* CFRunLoopTimerContext *context */ &context );

Can argument 6 of 'CFRunLoopTimerCreate' somehow be a reference, or is a const compile-time string the only possibility?

Any suggestions much appreciated!

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