Receiving C++ Object Reference in Lua

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I want to use a Lua script to alter an object that was created, modified and bound in C++. I'm experienced in C++ but not in Lua. I've been looking at tutorials but I can't figure out how I should do this. I'm wondering if there's a specific LuaBind method of doing this.

I basically want to get a pointer to an object in C++ so I can perform some functions on it through script. The pseudo code would be like:

void Guard::RunAI {

referenceToObject = this

do the following lua{

Guard* g = referenceToObject

g:patrol()

}

I've looked at the tutorials:

http://lua-users.org/wiki/UserDataWithPointerExample - but this assumes the call for the object to be created is done in Lua

http://lua-users.org/wiki/CppObjectBinding - this is much closer to what I want but this requires that the class be in a wrapper. I can't do this because I have hundreds of classes that I'd have to write a wrapper for, though, I could probably use a template. Also, I want my objects to appear in the Lua file by their class name as LuaBind let's me rather than using the wrappers name.

I only need a pointer to my object so I've been focusing on light userdata ( lua_pushlightuserdata ). Still, I've had no luck:

void AIManager::Spawn() {

...

guard = new Guard();

...

}

void Guard::RunAI() {

lua_pushlightuserdata(L, (void*)this);

lua_setglobal(L,"guard"); // lame method
// (Guard*)lua_touserdata(L, 1);

luaL_dostring(

L,

"g = Guard(guard)\n" // trying to give Lua control of a guard made in C++ using horrible method

"g:Test()\n" // just prints message to see if it worked.

);

}

This code doesn't compile because I don't have a Guard constructor that takes a LuaState for the reason mentioned earlier (too many classes). I'm looking for a better way of doing this but I'm beginning to settle on the idea of anything that works.

I have almost no idea what I'm doing here. Any idea on how I might do this? Thanks.

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