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- Subject: Re: General questions.
- From: Jamie Webb <j@...>
- Date: Tue, 6 Jul 2004 18:01:21 +0100
On Tue, Jul 06, 2004 at 09:53:28AM -0700, Peter Bradshaw wrote:
> (I've only been a lua user for about a month, so I may be about to get
> rudely slapped for inaccuracy).
>
> Light userdata sounds like exactly what you want. You just push a
> pointer into lua and that's what you get back.
>
> Setting the metatable from C and then checking it seems to be the way
> to ensure type safety.
Unfortunately, this won't work, because light userdatas cannot have
metatables. They are intended for internal use by C modules, and
shouldn't generally be shown to Lua code.
The principal is about right though. You want a full userdata that
contains just a pointer. Then you can use a metatable for type
checking and to provide the object with methods.
-- Jamie Webb