Convert CFIndex to NSUInteger?

Question

How do I convert typedef signed long CFIndex to typedef unsigned int NSUInteger?

Is it OK if I use a CFIndex as an argument of type NSUInteger. I haven't casted it, and the complier doesn't seem to mind. Does the compiler just do the conversion for me?

score 5 · Answer 1 · answered Mar 31 '12 at 03:26

5

You need to be very careful here, since CFIndex is signed and NSUInteger is unsigned. There are various routines that return a CFIndex -1. You need to check for that before using it as an NSUInteger.

answered Mar 31 '12 at 03:26

Rob Napier

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if (index >= 0) { NSUInteger uIndex = (NSUInteger)index; ... } else { error-or-return-or-whatever; } – Rob Napier Apr 15 '12 at 15:59

score -1 · Answer 2 · answered Mar 31 '12 at 03:22

-1

Yes, the compiler performs implicit type conversion.

answered Mar 31 '12 at 03:22

ma11hew28

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Convert CFIndex to NSUInteger?

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