Re: really fast metatable lookup in C

[Adrian Sietsma <adrian_groups@...>]

Asko Kauppi wrote:

> Based on the enum/int32 implementation for Lua, I'm in the need for an 
> extremely fast integer -> metatable lookup on the C side.
>
> Currently, I use 'glua_meta_nn' keys into the registry, but there must 
> be a better way.
>
> Could I, say, have a set of some 1000 :) virtual indices s.a. 
> 'REGISTRYINDEX' all for my own need. I could maintain that range by 
> myself (store table references there, in neat order) as long as it would 
> be sure no-one else is dealing with those 'slots'.
>
> Does Lua already provide this, or could such a range be considered for 
> the future?
>
> -ak
if you are on the c-side, could you use upvalues ?
(push them all at lib init time maybe ?)

is there a limit to the number of upvalues allowed ?

Adrian