Stefan Behnel <stefan_ml <at> behnel.de> writes:
> BTW, I noticed that the code in typeobject.c uses "DECREF before set" two
> times, like this:
>
> method_cache[h].version = type->tp_version_tag;
> method_cache[h].value = res; /* borrowed */
> Py_INCREF(name);
> Py_DECREF(method_cache[h].name);
> method_cache[h].name = name;
Since this is so common, would it be useful to define a macro for the correct
construct?
Something like
#define Py_SETREF(var, obj) \
{ PyObject *tmp = (var); Py_INCREF(obj); \
(var) = (obj); Py_XDECREF(tmp); }
Or, if we want to allow more optimizations, make two versions of it:
#define Py_SETREF(var, obj) \
{ PyObject *tmp = (var); Py_INCREF(obj); \
(var) = (obj); Py_DECREF(tmp); }
#define Py_XSETREF(var, obj) \
{ PyObject *tmp = (var); Py_INCREF(obj); \
(var) = (obj); Py_XDECREF(tmp); }
Regards
Antoine.
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