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Fix overriding static properties in derived classes

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Fixes #775.

Assignments of the form `Type.static_prop = value` should be translated to
`Type.static_prop.__set__(value)` except when `isinstance(value, static_prop)`.
This commit is contained in:
Dean Moldovan
2017-04-06 23:45:12 +02:00
parent db200955b9
commit e0e2ea3378
3 changed files with 28 additions and 2 deletions
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12
include/pybind11/class_support.h
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@@ -124,8 +124,15 @@ extern "C" inline int pybind11_meta_setattro(PyObject* obj, PyObject* name, PyOb
// descriptor (`property`) instead of calling `tp_descr_get` (`property.__get__()`).
PyObject *descr = _PyType_Lookup((PyTypeObject *) obj, name);
// Call `static_property.__set__()` instead of replacing the `static_property`.
if (descr && PyObject_IsInstance(descr, (PyObject *) get_internals().static_property_type)) {
// The following assignment combinations are possible:
// 1. `Type.static_prop = value` --> descr_set: `Type.static_prop.__set__(value)`
// 2. `Type.static_prop = other_static_prop` --> setattro: replace existing `static_prop`
// 3. `Type.regular_attribute = value` --> setattro: regular attribute assignment
const auto static_prop = (PyObject *) get_internals().static_property_type;
const auto call_descr_set = descr && PyObject_IsInstance(descr, static_prop)
&& !PyObject_IsInstance(value, static_prop);
if (call_descr_set) {
// Call `static_property.__set__()` instead of replacing the `static_property`.
#if !defined(PYPY_VERSION)
return Py_TYPE(descr)->tp_descr_set(descr, obj, value);
#else
@@ -137,6 +144,7 @@ extern "C" inline int pybind11_meta_setattro(PyObject* obj, PyObject* name, PyOb
}
#endif
} else {
// Replace existing attribute.
return PyType_Type.tp_setattro(obj, name, value);
}
}