Revert "[smart_holder] Keep parent alive when returning raw pointers (#4609)"

This reverts commit 99cf27a.

Author: rwgk

include/pybind11/detail/smart_holder_type_casters.h

@@ -788,11 +788,7 @@ struct smart_holder_type_caster : smart_holder_type_caster_load<T>,
 
     static handle cast(T *src, return_value_policy policy, handle parent) {
         if (policy == return_value_policy::_clif_automatic) {
-            if (parent) {
-                policy = return_value_policy::reference_internal;
-            } else {
-                policy = return_value_policy::reference;
-            }
+            policy = return_value_policy::reference;
         }
         return cast(const_cast<T const *>(src), policy, parent); // Mutbl2Const
     }

tests/test_return_value_policy_override.cpp

@@ -2,37 +2,10 @@
 
 #include "pybind11_tests.h"
 
-#include <vector>
-
 namespace test_return_value_policy_override {
 
 struct some_type {};
 
-struct data_field {
-    int value = -99;
-
-    explicit data_field(int v) : value(v) {}
-};
-
-struct data_fields_holder {
-    std::vector<data_field> vec;
-
-    explicit data_fields_holder(std::size_t vec_size) {
-        for (std::size_t i = 0; i < vec_size; i++) {
-            vec.emplace_back(13 + static_cast<int>(i) * 11);
-        }
-    }
-
-    data_field *vec_at(std::size_t index) {
-        if (index >= vec.size()) {
-            return nullptr;
-        }
-        return &vec[index];
-    }
-
-    const data_field *vec_at_const_ptr(std::size_t index) { return vec_at(index); }
-};
-
 // cp = copyable, mv = movable, 1 = yes, 0 = no
 struct type_cp1_mv1 {
     std::string mtxt;
@@ -183,8 +156,6 @@ std::unique_ptr<type_cp0_mv0> return_unique_pointer_nocopy_nomove() {
 
 } // namespace test_return_value_policy_override
 
-using test_return_value_policy_override::data_field;
-using test_return_value_policy_override::data_fields_holder;
 using test_return_value_policy_override::some_type;
 using test_return_value_policy_override::type_cp0_mv0;
 using test_return_value_policy_override::type_cp0_mv1;
@@ -234,8 +205,6 @@ struct type_caster<some_type> : type_caster_base<some_type> {
 } // namespace detail
 } // namespace pybind11
 
-PYBIND11_SMART_HOLDER_TYPE_CASTERS(data_field)
-PYBIND11_SMART_HOLDER_TYPE_CASTERS(data_fields_holder)
 PYBIND11_SMART_HOLDER_TYPE_CASTERS(type_cp1_mv1)
 PYBIND11_SMART_HOLDER_TYPE_CASTERS(type_cp0_mv1)
 PYBIND11_SMART_HOLDER_TYPE_CASTERS(type_cp1_mv0)
@@ -270,21 +239,6 @@ TEST_SUBMODULE(return_value_policy_override, m) {
         },
         py::return_value_policy::_clif_automatic);
 
-    py::classh<data_field>(m, "data_field").def_readwrite("value", &data_field::value);
-    py::classh<data_fields_holder>(m, "data_fields_holder")
-        .def(py::init<std::size_t>())
-        .def("vec_at",
-             [](const py::object &self_py, std::size_t index) {
-                 auto *self = py::cast<data_fields_holder *>(self_py);
-                 return py::cast(
-                     self->vec_at(index), py::return_value_policy::_clif_automatic, self_py);
-             })
-        .def("vec_at_const_ptr", [](const py::object &self_py, std::size_t index) {
-            auto *self = py::cast<data_fields_holder *>(self_py);
-            return py::cast(
-                self->vec_at_const_ptr(index), py::return_value_policy::_clif_automatic, self_py);
-        });
-
     py::classh<type_cp1_mv1>(m, "type_cp1_mv1")
         .def(py::init<std::string>())
         .def_readonly("mtxt", &type_cp1_mv1::mtxt);

tests/test_return_value_policy_override.py

@@ -17,21 +17,6 @@ def test_return_pointer():
     assert m.return_pointer_with_policy_clif_automatic() == "_clif_automatic"
 
 
-def test_persistent_holder():
-    h = m.data_fields_holder(2)
-    assert h.vec_at(0).value == 13
-    assert h.vec_at(1).value == 24
-    assert h.vec_at_const_ptr(0).value == 13
-    assert h.vec_at_const_ptr(1).value == 24
-
-
-def test_temporary_holder():
-    data_field = m.data_fields_holder(2).vec_at(1)
-    assert data_field.value == 24
-    data_field = m.data_fields_holder(2).vec_at_const_ptr(1)
-    assert data_field.value == 24
-
-
 @pytest.mark.parametrize(
     ("func", "expected"),
     [