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- Subject: Re: How do I add a "local" using the c api
- From: Sam Roberts <vieuxtech@...>
- Date: Tue, 31 Mar 2009 09:41:52 -0700
On Tue, Mar 31, 2009 at 6:22 AM, Tom Miles <Tom@creative-assembly.co.uk> wrote:
> I don't know if this has been discussed before, I had a quick look at
> the list archives, but only found something a bit relevant that didn't
> seem to amount to anything.
> My question is this though. I have several states that inherit their
> environment from parent states. When I initiate a state I call some c
> code to add some extra standard bits and pieces, some of which I want
> child states to inherit, others I don't. In a script I would declare
> these as local, but I haven't found anything that copies the required
> behaviour in the c api. I've found lua_setlocal(), but that's part of
> the debug library, so would seem inappropriate, and the only reference I
> found on the list before mentions upvalues. Are local variables just
> upvalues for the entire state or something?
> In short, how do I achieve something like this from the c api when I
> create my state?
> -- script start
> local MAX_LIMIT = 10
> -- lots of functions that use MAX_LIMIT everywhere
> -- end script
> (Short script huh!)
One way is with a c closure and upvalues:
That's probably closest to your lua code.
Another would be with a function environment: