src: Add descriptor protocol support for Python C++ extension modules

src/Base/PythonTypeExt.h

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+/***************************************************************************
+ *   Copyright (c) 2023 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *   Copyright (c) 2023 Mario Passaglia <mpassaglia[at]cbc.uba.ar>         *
+ *                                                                         *
+ *   This file is part of FreeCAD.                                         *
+ *                                                                         *
+ *   FreeCAD is free software: you can redistribute it and/or modify it    *
+ *   under the terms of the GNU Lesser General Public License as           *
+ *   published by the Free Software Foundation, either version 2.1 of the  *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   FreeCAD is distributed in the hope that it will be useful, but        *
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
+ *   Lesser General Public License for more details.                       *
+ *                                                                         *
+ *   You should have received a copy of the GNU Lesser General Public      *
+ *   License along with FreeCAD. If not, see                               *
+ *   <https://www.gnu.org/licenses/>.                                      *
+ *                                                                         *
+ **************************************************************************/
+
+#ifndef BASE_PYTHONTYPEEXT_H
+#define BASE_PYTHONTYPEEXT_H
+
+#include <FCGlobal.h>
+
+namespace Py
+{
+    class PythonType;
+}
+
+using PyObject = struct _object;
+
+namespace Base
+{
+
+/// class to extend PyCXX PythonType class
+class BaseExport PythonTypeExt
+{
+public:
+    PythonTypeExt(Py::PythonType& type);
+
+    Py::PythonType& set_tp_descr_get(PyObject* (*tp_descr_get)(PyObject* self, PyObject* obj, PyObject* type));
+    Py::PythonType& set_tp_descr_set(int (*tp_descr_set)(PyObject* self, PyObject* obj, PyObject* value));
+
+private:
+    Py::PythonType& pytype;
+};
+
+} // namespace Base
+
+#endif // BASE_PYTHONTYPEEXT_H