Re: lua hacking wondering

[Dimitris Papavasiliou <jimmyp@...>]

Roberto Ierusalimschy wrote:

> The metatable itself has these bits. When we modify a table there
> is no way to know which objects use it as a metatable, so there would
> be no way to reset their bits.
>  
Wouldn't it be possible to store a pointer the the internal table 
structure of the metatable that is ssigned to each table/udata? That way 
the cost of checking wether a metamethod exists would be one pointer 
lookup and some bit testing wich is negligible (plus maybe some overhead 
in lua_setmetatable), and we would be able to have our precious 
__settable ,__gettable and maybe __next metamethods.

-- Dimitris