How to resolve circular reference in python C extension?

[罗勇刚(Yonggang Luo)]

static PyObject *
Repository_get_index(Repository *self, void *closure)
{
    int err;
    git_index *index;
    Index *py_index;

    assert(self->repo);

    if (self->index == NULL) {
        err = git_repository_index(&index, self->repo);
        if (err < 0)
            return Error_set(err);

        py_index = PyObject_GC_New(Index, &IndexType);
        if (!py_index) {
            git_index_free(index);
            return NULL;
        }

        Py_INCREF(self);
        py_index->repo = self;
        py_index->index = index;
        PyObject_GC_Track(py_index);
        self->index = (PyObject*)py_index;
    }

    Py_INCREF(self->index);
    return self->index;
}

-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo
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