It's making a NULL pointer to a member function of A with an integer argument and a void return type.
I'm not sure what's going on under the hood with why the NULL is required, but I suspect that it has something to do with the fact that void info(); void info(int i); require two function pointers, but void info(int i=0) can only use one function pointer. I suspect that they're trying to handle both cases with the same interface. I'm just guessing though, so I could be wrong about this. Regards, Bill -----Original Message----- From: cplusplus-sig-bounces+wladwig=wdtinc....@python.org [mailto:cplusplus-sig-bounces+wladwig=wdtinc....@python.org] On Behalf Of Hans Roessler Sent: Thursday, May 21, 2009 4:00 PM To: Development of Python/C++ integration Subject: Re: [C++-sig] variable argument number and BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS Thanks, ".def("info", (void(A::*)(int))0, A_info_overloads());" does it. Could somebody explain what the meaning of this "(void(A::*)(int))0" construct is? Is it a function pointer? Why the 0? (Just now I am fine with the proposed solution, but if I even understand it, you will read fewer stupid question from me in this list ;-) Hans ----- Ursprüngliche Mail ---- > Von: William Ladwig <wlad...@wdtinc.com> > An: Development of Python/C++ integration <cplusplus-sig@python.org> > Gesendet: Donnerstag, den 21. Mai 2009, 18:30:46 Uhr > Betreff: Re: [C++-sig] variable argument number and > BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS > > I haven't tried this myself, but I think all you need to do to wrap the > member > function is this: > > .def("info", (void(A::*)(int))0, A_info_overloads()); > > Hope this helps, > Bill _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig _______________________________________________ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
