problem with binding operator

Just starting Luabinding and run into some problems with () operators,
havent read anything about luabind not supporting those.
struct Str8 // Text String (8-bit per character)
{
   // get
           operator CChar8*()C {return _d.data();} // cast to CChar8*
   CChar8* operator()(      )C {return _d.data();} // get  text data


void LuaString8(lua_State *L)
{
     module(L)
     [
         luabind::class_<Str8>("Str8")
         .def(CChar8*())


error C2059: syntax error : ')'



-- 
Later

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