2010/1/4 Greg Parker <gpar...@apple.com>:
> 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
>
Easily fixed:
#define GDRelease(x) [(x) release], (x) = nil, (void)0
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