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

Tue Jul 13 04:36:32 CEST 2004

 Jim> The correct way to do this is something like:
 Jim> tmp = self->foo;
 Jim> self-> foo = NULL;
 Jim> Py_XDECREF(tmp);
 Jim> I suggest that there should be a standard macro to automate this.
 Jim> Py_CLEAR(self->foo)
 Jim> This would be defined to be the same result as Py_XDECREF except
 Jim> that the argument will be set to NULL.
 Jim> Thoughts?
Just my two cents, but the name suggests to me that it's doing more than a
simple decref and set to NULL. I can't think of anything else off the top
of my head that seems obviously better though.
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