Making non-static class member function available to Lua.

Hi,

Let me outline what I'm trying to do.

I have a base entity class, from this I derive all the other kinds of
entities in my game. One of these entities is named "lua_component". It is a
component of a weapon whos behavior is described by a short Lua script. I do
this such that someone can add their own custom weapon components with
custom script inside. The components communicate with each-other by means of
a signaling function in the C++ master program that works out which I/O of
which components is connected to any others, and routes the signals around
accordingly.

My problem arises when a "FIRE" signal reaches the muzzle component of a
constructed weapon. I want to be able to call a "spawn_entity" function from
Lua, and pass the C++ master program a struct containing everything it needs
to know to spawn a projectile entity.

Each component has its own "lua_State* lua_object", and own "void
spawn_entity(int arg)" function. In the constructor of my lua_component
class I bind the spawn_entity thus:

	lua_object = lua_open();
        luaL_openlibs(lua_object);
        luabind::open(lua_object);

	luabind::module(lua_object) [
                luabind::def("spawn_entity", &lua_component::spawn_entity)
        ];

So far so good, however, when I call spawn_entity from within Lua:

	luaL_dostring(
		lua_object,
		"spawn_entity(4)\n"
	);

I get the following dumped onto the stack:

	"No matching overload found, candidates:
	void spawn_entity(custom [class lua_component]&,int)"	char *

What am I doing wrong? is what I'm trying to do fundamentally impossible?
Binding a non-static class member variable into a Lua machine?

Thanks,
tjhowse.

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