[Swig-user] Bug with allprotected virtual wraps?

[Thomas M. <to...@al...>]

I'm running into problems using allprotected, generating wraps...  I've tried to debug, but I don't know nearly enough on how this code is supposed to work.  Here is the code I'm seeing the problem with:

Myplugin.i
----------

%module(directors="1", allprotected="1") myplugin
%import "base.i"

class myPlugin : public PluginBase
{
public:
       //void Foo(); <- not required..
} ;

base.i
------

%module(directors="1", allprotected="1") base

class string { };
class widget { };
class settings { };

%feature("director");
class PluginBase
{
  public:
    virtual ~PluginBase ();
  protected:
    virtual bool SaveWindowInfo(const string &, const string &, widget * w);
    virtual bool SaveWindowInfo(const string &, const string &, widget * w, settings *s);
};


The problem is if I look at the generated file, I see this code:

SWIGINTERN PyObject *_wrap_myPlugin_SaveWindowInfo(PyObject *self, PyObject *args) {
  int argc;
  PyObject *argv[2];
  int ii;

  if (!PyTuple_Check(args)) SWIG_fail;
  argc = args ? (int)PyObject_Length(args) : 0;
  for (ii = 0; (ii < 1) && (ii < argc); ii++) {
    argv[ii] = PyTuple_GET_ITEM(args,ii);
  }

fail:
  SWIG_SetErrorMsg(PyExc_NotImplementedError,"Wrong number or type of arguments for overloaded function 'myPlugin_SaveWindowInfo'.\n"
    "  Possible C/C++ prototypes are:\n"
    "    PluginBase::SaveWindowInfo(string const &,string const &,widget *)\n"
    "    PluginBase::SaveWindowInfo(string const &,string const &,widget *,settings *)\n");
  return 0;
}

Notice it contains no code to execute the different 'SWIG_#' wrapped functions (but those functions do exist)!

I did look in dispatchFunction in the source code.  It looks like Swig_overload_dispatch_cast gets called, and it calls Swig_overload_rank.  This function returns a list, which is of size 0 (should be 2).  That's the issue.  But, I'm not sure how to proceed without some guidance...

Can anyone think of a workaround?  I've found a couple, but they won't work for me:


1)      Getting rid of protected seems to do the trick.  But, I think I'm going to have trouble convincing others of doing this.. Especially since I've got a lot more than 1 function at issue here.

2)      If I merged the two .i files into 1, all works well.  But, this is tricky to do, I believe, because my actual setup is much more complicated than this...

Is it possible Swig_overload_rank isn't handling looking in the %import files?   Any ideas on any simple, clever workaround?

Thanks,

Tom