LuaBind and toLua are two OO binders I know of...

[Edited by - evolutional on August 1, 2004 3:04:36 PM]

One which I have prototyped, I have discussed on this board in some recent threads. Some other people appear to be doing the same thing.

For a game with a lot of characters (NPCs in a RPG, or anybody in a strategy), it is useful to have scripts which run over a long(ish) period. For this we use coroutines, I've figured out how to (with luabind), attach a coroutine to a native C++ object and resume it when the thing it's waiting for completes.

luabind seems to be the way to go - it handles the wrapper stuff for you.

Basically I attach a luaobject which is actually a coroutine to each actor (i.e. a character in most cases), and remember what it is they're waiting for.

In the case of something like pathfinding, the lua code calls a native method to tell it to find a path and start walking towards its destination. When it reaches its destination (or if it is blocked or something like that), it wakes up the lua code by resuming the coroutine, which can then carry out subsequent steps of its program.

Other objects can of course do the same thing at the same time, independently, without using native threads or having much of an overhead (yes, I realise that coroutines must store the lua stack, but hopefully that is fairly small)

Mark

I've been embedding Lua into my Mud engine and doing all the bindings by hand. It's really not that hard if you use userdata to hold C++ classes. The hardest part was figuring out the stack and metatables, after that it's a cakewalk. It takes me only a couple minutes to write a binding function for lua->C++ classes.

The Lua book is/was the biggest help, you can look at it here:
http://www.lua.org/pil/