Add case return_value_policy::_clif_automatic in type_caster_base.h

include/pybind11/detail/type_caster_base.h

@@ -580,6 +580,7 @@ class type_caster_generic {
                 wrapper->owned = false;
                 break;
 
+            case return_value_policy::_clif_automatic:
             case return_value_policy::copy:
                 if (copy_constructor) {
                     valueptr = copy_constructor(src);

tests/test_copy_move.cpp

@@ -294,6 +294,15 @@ TEST_SUBMODULE(copy_move_policies, m) {
 
     // Make sure that cast from pytype rvalue to other pytype works
     m.def("get_pytype_rvalue_castissue", [](double i) { return py::float_(i).cast<py::int_>(); });
+
+    // Mimic situation generated by PyCLIF-pybind11.
+    // Requires `case return_value_policy::_clif_automatic` in `type_caster_base`.
+    struct PyCastUsingClifAutomaticTestType {};
+    py::class_<PyCastUsingClifAutomaticTestType>(m, "PyCastUsingClifAutomaticTestType");
+    m.def("py_cast_using_clif_automatic", []() {
+        PyCastUsingClifAutomaticTestType cpp_obj;
+        return py::cast(cpp_obj, py::return_value_policy::_clif_automatic);
+    });
 }
 
 /*

tests/test_copy_move.py

@@ -130,3 +130,8 @@ def test_pytype_rvalue_cast():
 
     value = m.get_pytype_rvalue_castissue(1.0)
     assert value == 1
+
+
+def test_py_cast_using_clif_automatic():
+    obj = m.py_cast_using_clif_automatic()
+    assert obj.__class__.__name__ == "PyCastUsingClifAutomaticTestType"