Call a lua function and pass a C++ Class object

I have a function declared in Lua
I want to be able to call that function from C++ and pass in a C++ class object, but I'm struggling how to do it.

The lua function looks like this:
--------AI.Lua starts----------
function UpdateActor(pActor)
                local pActorName = pActor.Name;
--             etc etc
                Return 0;
end
--------AI.Lua ends----------


CActor is declared in my luabinder:
---------Luabinding Code starts------
module(L)
                [
                                class_<CActor>("CActor")
                                                .property("Name",                                                                                         &CActor::GetActorName, &CActor::SetActorName)
//            etc etc
                                ,
                                def("Ptr2Actor",                                                                                                               &Ptr2Actor),
                ];
---------Luabinding Code starts------

I get an error when I call the lua function like this
---------C++ calling code starts----------
                CActor *actor = GetMyActor();
int ret = luabind::call_function<int>(luaVM, "UpdateActor", actor);
---------C++ calling code ends----------


This method works fine if I'm calling a C++ method through luabind.

Can anyone offer me any suggestions on how I should be doing this.  One possibility is that I need to somehow derive a lua function from a C++ function, but I haven't yet figured out how to do that.

Thanks for any help that you can offer.

Cheers
Beric
http://buzzrick.true.geek.nz




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