> The issue being worked-around is that of the compiler; during
> optimization, if you stop referencing myData, 
[snip]

Yes. As I said, I understand the issue - my only question was whether the 
short-circuited retain was enough to do it. I didn't know whether the compiler 
did this or the runtime. Thanks for enlightening me.

> perhaps an appropriately-named macro would be more fitting. 
Something on the order of 

_KEEP_ALIVE_( myData )

would be much more fitting and far less confusing to someone reading your code 
or a beginner reading the docs.

> Except -retain is more efficient under GC.

Probably irrelevant. Any realistic thing you would be doing with any realistic 
number of bytes in the NSData object would swamp the difference between a short 
circuited retain dispatch and a dispatch of -self.

...Bob




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