On Jan 2, 2010, at 9:30 AM, Alexander Spohr wrote:
> I put a , not a ; between the statements. So at least my last example would
> work - had I just left the last ; out of it:
>
> #define GDRelease(x) [(x) release], (x) = nil
> expands to:
> if(x)
> [(x) release], (x) = nil;
> else
> foo(x);
>
> But the while(0) looks not as fragile.
The do..while form also prevents errors like this:
if (GDRelease(x)) { ... }
// this is nonsense
if ( do { [(x) release]; (x) = nil; } while (0) ) { ... }
// this expansion is a compile error: good
if ( [(x) release], (x) = nil ) { ... }
// but this expansion compiles successfully: bad
--
Greg Parker gpar...@apple.com Runtime Wrangler
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