Problem with derived classes and overloaded member functions

Hello,

I have previously posted this with an unregistered e-Mail, but the message was never approved, so excuse me if it will appears again one day...
I'm very new to both Lua and luabind. I have a problem and I'm not sure whether I'm doing something wrong in handling an overloaded member function, or the derived class in which they are defined. I have used luabind with overloaded functions before, and I've used it with derived classes before, both without problem, but now that I tried combining the two, I am oscillating between compilation errors and runtime errors.

My base class is called 'IStreamPlugin' and has an overloaded member function called 'help', one of them taking no arguments and another one taking a 'const char *'. A derived class called 'PluginCLGeneric' implements these two functions. The way I tried to register them using 'luabind' is:

luabind::module(L) [
   luabind::class_<PluginCLGeneric>("PluginCLGeneric")
       .def(luabind::constructor<StreamManager&, LogManager&, lua_State*>())
       .def("help", (void(PluginCLGeneric::*)())&PluginCLGeneric::help)
       .def("help", (void(PluginCLGeneric::*)(const char*))&PluginCLGeneric::help)
   ];

This compiles fine, but when trying to call either of the 'help' functions from Lua, I get this error:

No matching overload found, candidates:
void help(PluginCLGeneric&,char const*)
void help(PluginCLGeneric&)

I figured that the problem might stem from the fact that I export only the derived class to Lua, and not the respective base class (although the exported functions do not depend on anything that stems from the base class). I rewrote my luabind section like this:

luabind::module(L) [
   luabind::class_<IStreamPlugin>("IStreamPlugin"),
   luabind::class_<PluginCLGeneric, IStreamPlugin>("PluginCLGeneric")
       .def(luabind::constructor<StreamManager&, LogManager&, lua_State*>())
       .def("help", (void(PluginCLGeneric::*)())&PluginCLGeneric::help)
       .def("help", (void(PluginCLGeneric::*)(const char*))&PluginCLGeneric::help)
   ];

according to the luabind documentation. However, this yields the following compilation error:

luabind/detail/inheritance.hpp(136) : error C2243: 'static_cast' : conversion from 'PluginCLGeneric *' to 'bases_t *' exists, but is inaccessible

I tried also exporting the constructor and the base class' versions of the functions (although they are pure virtual) with the same results. Also, if I change the second 'luabind::class' line to incorporate 'bases', i.e.

luabind::class_<PluginCLGeneric, luabind::bases<IStreamPlugin>>("PluginCLGeneric")

the error message changes to:

luabind/detail/inheritance.hpp(136) : error C2243: 'static_cast' : conversion from 'PluginCLGeneric *' to 'IStreamPlugin *' exists, but is inaccessible

I am a bit at a loss what it means that this cast is supposed to be inaccessible, or even needed. Can someone point me in the right direction?

I am using Visual C++ 2008 and a statically linked luabind-0.9.

Cheers
Daniel
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