Re: Overloaded C++ static methods and Python

On Thu, 23 Feb 2023 at 11:36, Jim Easterbrook <[email protected]>
wrote:

> I've encountered an interesting problem with the SWIG generated Python
> interface of overloaded C++ methods. This is my test case:
>
> > %module overload_test
> >
> > class class_A {
> > public:
> >     int method_1();
> >     int method_1(int x);
> >     int method_2();
> >     static int method_2(int x);
> > };
>
> The Python interface for method_1 is as you'd expect, but method_2()
> becomes a static method requiring a class_A object to be passed as a
> parameter. I'm running swig as follows:
>
> swig -c++ -python -builtin -fastdispatch overload_test.i
>
> The relevant parts of the wrapper file are
>
> >   (void)self;
> >   if (!(argc = SWIG_Python_UnpackTuple(args, "class_A_method_1", 0, 2,
> argv+1))) SWIG_fail;
> >   argv[0] = self;
> >   if (argc == 1) {
> >     PyObject *retobj = _wrap_class_A_method_1__SWIG_0(self, argc, argv);
> >     if (!SWIG_Python_TypeErrorOccurred(retobj)) return retobj;
> >     SWIG_fail;
> >   }
> >   if (argc == 2) {
> >     PyObject *retobj = _wrap_class_A_method_1__SWIG_1(self, argc, argv);
> >     if (!SWIG_Python_TypeErrorOccurred(retobj)) return retobj;
> >     SWIG_fail;
> >   }
>
> and
>
> >   (void)self;
> >   if (!(argc = SWIG_Python_UnpackTuple(args, "class_A_method_2", 0, 1,
> argv))) SWIG_fail;
> >   --argc;
> >   if (argc == 1) {
> >     int _v = 0;
> >     {
> >       void *vptr = 0;
> >       int res = SWIG_ConvertPtr(argv[0], &vptr, SWIGTYPE_p_class_A, 0);
> >       _v = SWIG_CheckState(res);
> >     }
> >     if (!_v) goto check_1;
> >     return _wrap_class_A_method_2__SWIG_0(self, argc, argv);
> >   }
> > check_1:
> >
> >   if (argc == 1) {
> >     PyObject *retobj = _wrap_class_A_method_2__SWIG_1(self, argc, argv);
> >     if (!SWIG_Python_TypeErrorOccurred(retobj)) return retobj;
> >     SWIG_fail;
> >   }
>
> Is this a known problem? Is there a workaround?
>
>
Overloading static with non-static... goodness! Might be worth analysing to
see if it only happens with -fastdispatch and/or -builtin.

William

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