[C++-sig] C++ compile error on .def from n00b.

[Randy Taylor]

I'm a n00b.
I'm trying to expose a C++ class that has a virtual mem fun with an 
implementation that I wish to override in Python.  Seems easy enough.  
Compiler disagrees, saying she does not like my def. I must be doing something 
wrong. What is it?  Thanks kindly in advance.

Here's my Wrapper:

struct ListenerWrap : tt_stream_ns::VIAmCallback, 
python::wrapper<tt_stream_ns::VIAmCallback>
{
    virtual void OnData(tt_stream_ns::VIAmSession *sess,
        const tt_stream_ns::VIAmSubject& subj,
        tt_stream_ns::VIAmSender *sender,
        tt_stream_ns::Streamable& obj,
        tt_stream_ns::VIAmListener *listener)
    {
        if (python::override the_override = this->get_override("OnData")) {
            the_override(sess,subj,sender,obj,listener); // *note*
            return;
        }
        tt_stream_ns::VIAmCallback::OnData(sess,subj,sender,obj,listener);
    }
    void default_OnData(tt_stream_ns::VIAmSession *sess,
        const tt_stream_ns::VIAmSubject& subj,
        tt_stream_ns::VIAmSender *sender,
        tt_stream_ns::Streamable& obj,
        tt_stream_ns::VIAmListener *listener)
    {
        this->tt_stream_ns::VIAmCallback::OnData
(sess,subj,sender,obj,listener);
    }
};


And my def:


BOOST_PYTHON_MODULE(pycore)
{
    python::class_<ListenerWrap, boost::noncopyable>("VIAmCallback")
            .def("OnData"
                ,&tt_stream_ns::VIAmCallback::OnData
                ,&ListenerWrap::default_OnData
                );
}


And here's her complaint:

c:\shi_zero_go\core\api\7_0\dev\pycore\pycore.cpp(81) : error 
C2780: 'boost::python::class_<W,X1>::self &boost::python::class_<W,X1>::def
(const char *,Fn,const A1 &,const A2 &,const A3 &)' : expects 5 arguments - 3 
provided
        with
        [
            W=ListenerWrap,
            X1=boost::noncopyable
        ]
        c:\shi_zero_go\misc\boost\1_32_0\dev\boost\python\class.hpp(265) : see 
declaration of 'boost::python::class_<W,X1>::def'
        with
        [
            W=ListenerWrap,
            X1=boost::noncopyable
        ]
c:\shi_zero_go\core\api\7_0\dev\pycore\pycore.cpp(81) : error 
C2780: 'boost::python::class_<W,X1>::self &boost::python::class_<W,X1>::def
(const char *,Fn,const A1 &,const A2 &)' : expects 4 arguments - 3 provided
        with
        [
            W=ListenerWrap,
            X1=boost::noncopyable
        ]
        c:\shi_zero_go\misc\boost\1_32_0\dev\boost\python\class.hpp(249) : see 
declaration of 'boost::python::class_<W,X1>::def'
        with
        [
            W=ListenerWrap,
            X1=boost::noncopyable
        ]




Thank you!
Randy Taylor