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Tue Jul 13 02:37:11 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-July/046090.html

On Jul 12, 2004, at 7:54 PM, Delaney, Timothy C (Timothy) wrote:

> Tim Peters wrote:
>
>> BTW, re-invented at least as often is a VISIT macro for use in
>> tp_traverse slots, like typeobject.c's (and several other files')
>>
>> #define VISIT(SLOT) \
>> 	if (SLOT) { \
>> 		err = visit((PyObject *)(SLOT), arg); \
>> 		if (err) \
>> 			return err; \
>> 	}
>
> Shouldn't this also be wrapped in a do {} while (0)?

I think it's obvious that this macro has not been made generic yet, 
given that err, visit, and arg aren't defined anywhere.

-bob
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[Python-Dev] Proposal: C API Macro to decref and set to NULL