Trying MakeVirtualDerivedAsBaseUniquePtr() again: pybind11 known issues #1138

Author: rwgk

pybind11/callback_with_virtual_class_pointer/callback_with_virtual_class_pointer.cc

@@ -36,6 +36,19 @@ PYBIND11_MODULE(callback_with_virtual_class_pointer, m) {
 
   m.def("UseCallback", &UseCallback);
   m.def("UseCppCallback", &UseCppCallback);
+
+  m.def("MakeVirtualDerivedAsBaseUniquePtr",
+        &MakeVirtualDerivedAsBaseUniquePtr
+        //,py::return_value_policy::take_ownership
+        //,py::return_value_policy::copy
+        //,py::return_value_policy::move
+        //,py::return_value_policy::reference
+        //,py::return_value_policy::reference_internal
+        //,py::return_value_policy::automatic
+        //,py::return_value_policy::automatic_reference
+       );
+  m.def("MakeVirtualDerivedAsBaseSharedPtr",
+        &MakeVirtualDerivedAsBaseSharedPtr);
 }
 
 }  // namespace callback_with_virtual_class_pointer

pybind11/callback_with_virtual_class_pointer/callback_with_virtual_class_pointer.h

@@ -35,6 +35,14 @@ inline int UseCppCallback() {
   return UseCallback(CppCallback);
 }
 
+inline std::unique_ptr<VirtualBase> MakeVirtualDerivedAsBaseUniquePtr() {
+  return std::unique_ptr<VirtualBase>(new VirtualDerived);
+}
+
+inline std::shared_ptr<VirtualBase> MakeVirtualDerivedAsBaseSharedPtr() {
+  return std::shared_ptr<VirtualBase>(new VirtualDerived);
+}
+
 }  // namespace callback_with_virtual_class_pointer
 
 #endif  // CALLBACK_WITH_VIRTUAL_CLASS_POINTER_H_

pybind11/callback_with_virtual_class_pointer/callback_with_virtual_class_pointer_main.py

@@ -24,6 +24,16 @@ def PyCallback(vb):
   res = mut.UseCallback(PyCallback)
   print(res)
 
+  vbs = mut.MakeVirtualDerivedAsBaseSharedPtr()
+  print(type(vbs))
+  res = vbs.GetSomething()
+  print(res)
+
+  vbu = mut.MakeVirtualDerivedAsBaseUniquePtr()
+  print(type(vbu))
+  res = vbu.GetSomething()  # https://github.com/pybind/pybind11/issues/1138
+  print(res)
+
   print('Done.')