C++ GDExtension: missing methods in MultiMeshInstance2D class

[txesmi]

Godot 4.3 stable unofficial platpack + godot_cpp 4.3

Hi all,
I am testing gdextension and want to create a MultiMeshInstance2D from there. I am able to create the Mesh and the Multimesh for the instance. I succesfully got them in gdscript and built the instance for test purpouses. But I got a missing member of MultiMeshInstance2D class error when trying to create it into the extension.

#include <godot_cpp/classes/mesh.hpp>
#include <godot_cpp/classes/array_mesh.hpp>
#include <godot_cpp/classes/multi_mesh.hpp>
#include <godot_cpp/classes/multi_mesh_instance2d.hpp>

...

Ref<MultiMeshInstance2D> TiledRails::_create_multimesh_instance() {
    Ref<MultiMeshInstance2D> _multimesh_instance = memnew( MultiMeshInstance2D );
    _multimesh_instance->set_multimesh( _create_multimesh() );

    return _multimesh_instance;
}

In file included from godot-cpp/gen/include/godot_cpp/classes/node.hpp:41,
                 from godot-cpp/gen/include/godot_cpp/classes/canvas_item.hpp:38,
                 from godot-cpp/gen/include/godot_cpp/classes/node2d.hpp:36,
                 from src/tiled_rails.h:8,
                 from src/tiled_rails.cpp:13:
godot-cpp/include/godot_cpp/classes/ref.hpp: In instantiation of 'void godot::Ref<T>::unref() [with T = godot::MultiMeshInstance2D]':
godot-cpp/include/godot_cpp/classes/ref.hpp:217:3:   required from 'godot::Ref<T>::~Ref() [with T = godot::MultiMeshInstance2D]'
src/tiled_rails.cpp:432:78:   required from here
godot-cpp/include/godot_cpp/classes/ref.hpp:204:45: error: 'class godot::MultiMeshInstance2D' has no member named 'unreference'
  204 |                 if (reference && reference->unreference()) {

It returns same errors for ‘reference’ and ‘init_ref’ methods too.
It also returns some incomplete type errors around MultiMeshInstance2D.

In file included from godot-cpp/include/godot_cpp/core/class_db.hpp:38,
                 from src/tiled_rails.h:7:
godot-cpp/include/godot_cpp/core/method_bind.hpp: In instantiation of 'GDExtensionVariantType godot::MethodBindTR<R, P>::gen_argument_type(int) const [with R = godot::Ref<godot::MultiMeshInstance2D>; P = {}]':
godot-cpp/include/godot_cpp/core/method_bind.hpp:447:33:   required from here
godot-cpp/include/godot_cpp/core/method_bind.hpp:451:71: error: incomplete type 'godot::GetTypeInfo<godot::Ref<godot::MultiMeshInstance2D>, void>' used in nested name specifier
  451 |               return GDExtensionVariantType(GetTypeInfo<R>::VARIANT_TYPE);
      |                                                             ^~~~~~~~~~~~

godot-cpp/include/godot_cpp/core/method_bind.hpp: In instantiation of 'godot::PropertyInfo godot::MethodBindTR<R, P>::gen_argument_type_info(int) const [with R = godot::Ref<godot::MultiMeshInstance2D>; P = {}]':
godot-cpp/include/godot_cpp/core/method_bind.hpp:455:23:   required from here
godot-cpp/include/godot_cpp/core/method_bind.hpp:461:62: error: incomplete type 'godot::GetTypeInfo<godot::Ref<godot::MultiMeshInstance2D>, void>' used in nested name specifier
  461 |                         return GetTypeInfo<R>::get_class_info();
      |                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
godot-cpp/include/godot_cpp/core/method_bind.hpp: In instantiation of 'GDExtensionClassMethodArgumentMetadata godot::MethodBindTR<R, P>::get_argument_metadata(int) const [with R = godot::Ref<godot::MultiMeshInstance2D>; P = {}]':
godot-cpp/include/godot_cpp/core/method_bind.hpp:469:49:   required from here
godot-cpp/include/godot_cpp/core/method_bind.hpp:473:48: error: incomplete type 'godot::GetTypeInfo<godot::Ref<godot::MultiMeshInstance2D>, void>' used in nested name specifier
  473 |                         return GetTypeInfo<R>::METADATA;
      |                                                ^~~~~~~~

What is happening here? It seems an internal error…
Thanks in advance

[dementive]

MultiMeshInstance2D is not ref counted but you are wrapping it in a Ref in your code. If you read the compiler message carefully it is telling you exactly this. Also check the docs (MultiMeshInstance2D — Godot Engine (stable) documentation in English) if it does not inherit from RefCounted you cannot make that class a Ref.

[txesmi]

omg, for some reason I though all complex objects were treated as references. I was obviously wrong. I will take care of this in the future.

Thank you very much and forgive my clumsiness.