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Handle result from PyObject_VisitManagedDict (#6032)

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* Handle result from PyObject_VisitManagedDict

* add unit test

* style: pre-commit fixes

* use different variable name

This avoids a warning on msvc about Py_Visit shadowing the vret variable.

* skip test_get_referrers on unsupported runtimes

The managed-dict referrer check is only known to work on CPython 3.13.13+ and 3.14.4+, while earlier releases and non-CPython interpreters can report different traversal behavior.

Made-with: Cursor

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rgrossekunst@nvidia.com>
This commit is contained in:
Max Bachmann
2026-04-12 05:02:27 +02:00
committed by GitHub
parent 4158dcfe7d
commit 0db7f72dc2
3 changed files with 28 additions and 1 deletions
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5
include/pybind11/detail/class.h
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@@ -578,7 +578,10 @@ inline PyObject *make_object_base_type(PyTypeObject *metaclass) {
/// dynamic_attr: Allow the garbage collector to traverse the internal instance `__dict__`.
extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *arg) {
#if PY_VERSION_HEX >= 0x030D0000
PyObject_VisitManagedDict(self, visit, arg);
int ret = PyObject_VisitManagedDict(self, visit, arg);
if (ret) {
return ret;
}
#else
PyObject *&dict = *_PyObject_GetDictPtr(self);
Py_VISIT(dict);