On Fri, Jul 23, 2021 at 5:08 PM MRAB <pyt...@mrabarnett.plus.com> wrote:
>
> On 2021-07-23 09:20, Bartosz Golaszewski wrote:
> > Hi!
> >
> > I'm working on a Python C extension and I would like to expose a
> > custom enum (as in: a class inheriting from enum.Enum) that would be
> > entirely defined in C.
> >
> > It turned out to not be a trivial task and the regular mechanism for
> > inheritance using .tp_base doesn't work - most likely due to the
> > Enum's meta class not being pulled in.
> >
> > Basically I'm trying to do this:
> >
> [snip]
> >
> > static PyObject *make_bases(PyObject *enum_mod)
> > {
> > PyObject *enum_type, *bases;
> >
> > enum_type = PyObject_GetAttrString(enum_mod, "Enum");
> > if (!enum_type)
> > return NULL;
> >
> > bases = PyTuple_Pack(1, enum_type); /* Steals reference. */
>
> PyTuple_Pack doesn't steal references, as far as I can tell.
>
Right, the doc says it's equivalent to Py_BuildValue("(OO...)", ...)
and it does increase the reference count on stored objects. It doesn't
answer the main question though. :)
Bartosz
> > if (!bases)
> > Py_DECREF(enum_type);
> >
> > return bases;
> > }
> >
> [snip]
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