Re: Changing metatable contents

[Mark Hamburg <mhamburg@...>]

Title: Re: Changing metatable contents

Thank you. I had misremembered the admonition.

Mark

on 3/25/04 8:04 PM, RLake@oxfam.org.pe at RLake@oxfam.org.pe wrote:

> If you look at line 487 of table.c, you will see that Lua already does just as you suggest 
> with the fasttm cache flags. 
>
> I'm going way out on a limb here, but as far as I know, the admonition only applies to the __mode key 
> (at least that is the text I found in the manual); changing the weak mode of a table which already has 
> elements is likely to lead to undefined (if not undefinable) behaviour. 
>
> So the only issue I can see is that changing a metatable will clear the cache flags, which may 
> have some minimal short-term performance impact. 
>
> R.