def _python_to_cpp_to_python(): """Calls different C++ functions that come back to Python.""" class ExtendedVirtClass(m.VirtClass): def virtual_func(self): pass def pure_virtual_func(self): pass extended = ExtendedVirtClass() m.test_callback_py_obj(lambda: None) m.test_callback_std_func(lambda: None) m.test_callback_virtual_func(extended) m.test_callback_pure_virtual_func(extended)