Re: Passing userdata to and from stack

[RLake@...]

Another FAQ candidate, I think.

Bob: Lua scripts do not take arguments. So you have to work around that:

1) Make your script return a function which takes arguments. Call dofile 
to get the function, and then call the function with your arguments (in 
this case, your lightuserdata).

2) Make the arguments named global objects. Or create a global context 
table, and make the arguments keys of that table. Or some combination of 
the above.

3) Well, everything is a variation on those themes, actually. For example, 
you could create a callback function, (as a global variable whose value is 
a function) which returned information. 

It really depends on how you want your script to interact with the 
environment. If it is a configuration script, for example, it is usually 
convenient to litter the global environment with named configuration 
tables. On the other hand, solution one is often convenient for scripts 
which create objects. But it is really a question of style, in the end.

Rici.