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[Python-Dev] if/else and macros

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On Mon, Jul 24, 2000 at 09:38:15PM +0100, Barry Scott wrote:
> > > > ! #define UTF8_ERROR(details) \
> > > > !   if (1) {                                                  \
> > > > !       if (utf8_decoding_error(&s, &p, errors, (details)))   \
> > > > !           goto onError;                                     \
> > > > !       continue;                                             \
> > > > !   } else
> 
> Try defining the macro this way:

> #define UTF8_ERROR(details) \
>   do {                                                      \
>       if (utf8_decoding_error(&s, &p, errors, (details)))   \
>           goto onError;                                     \
>       continue;                                             \
>   } while(0)

That isn't going to work, and is the entire reason for the 'if' construction
rather than the 'do {} while' one: the 'continue' applies to the innermost
loop, the 'do {} while(0)', producing some decidedly unpredicted behaviour.

Anyhow, I believe it's fixed more adequately now, or someone is going to ;P

-- 
Thomas Wouters <thomas@xs4all.net>

Hi! I'm a .signature virus! copy me into your .signature file to help me spread!

• Previous message: [Python-Dev] if/else and macros
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