Dynamic typing question

Is it possible to use the RTTI info to have lua figure out the original type
of a sliced object?  IE:


class BaseObject : public luabind::wrap_base
{

};

class DerivedObject : public BaseObject
{
public:
    int i;
}

lua_State* L;

bool LuaStateMgrImpl::Init()
{
    L = lua_open();

    // load the libs
    luaL_openlibs(L);

    // Add our libs
    luabind::open(L);

    luabind::module(L)
    [
        luabind::class_<BaseObject >("BaseObject "),
        luabind::class_<DerivedObject , BaseObject >("DerivedObject ")
            .def(luabind::constructor<>())
            .def_readwrite("i", &DerivedObject ::i)

    ];
}

void GenericCall( const char* pszFunctionCall, BaseObject &o1, BaseObject
&o2 )
{
    luabind::call_function<void>(L, pszFunctionCall, &o1, &o2);
}

void callsomething()
{
    DerivedObject do1;
    do1.i = 5;
    DerivedObject do2;
    GenericCall("SomeFunc", do1, do2);
    cout << do2.i;
}

lua:
function SomeFunc( do1, do2)
    print (do1.i)
    do2.i = 3
end

Obviously the goal is to have standard out show:
5
3

Is there a way to handle this via RTTI or another mechanism, otherwise,
what's the best practice for some kind of generic call function?

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