Re: A proposal for faster userdata type checking

["Alex Davies" <alex.mania@...>]

Does anyone else think it would be nice to simply have a byte tag stored 
with each userdata? Couldn't be quicker to check, and it'd have the added 
benefit of allowing custom metatables per userdata object. (Only useful in a 
few cases, but still).

- Alex

----- Original Message ----- 
From: "Taj Khattra"

> On Thu, Feb 28, 2008 at 7:57 AM, Chris <coderight@gmail.com> wrote:
> >  fine but luaL_checkudata adds a significant amount of overhead when
> >  making heavy use of calls that need to check userdata types (which is
> >  very important when creating "safe" APIs).
>
> did you compare the performance of storing the metatable in the C function
> environment instead of the registry?
>
> i seem to recall mike pall posting some performance numbers comparing
> the two approaches, but google is failing me at the moment.