Re: "nesting" metatables

["Soni L." <fakedme@...>]

On 30/12/15 02:17 PM, Roberto Ierusalimschy wrote:
> > On Fri, Dec 25, 2015 at 12:00 AM, Jonathan Goble <jcgoble3@gmail.com> wrote:
> >
> > > On Thu, Dec 24, 2015 at 3:54 PM, Egor Skriptunoff
> > > <egor.skriptunoff@gmail.com> wrote:
> > > > On Thu, Dec 24, 2015 at 12:29 PM, Jonathan Goble <jcgoble3@gmail.com>
> > > wrote:
> > > > > This metatable chaining could theoretically continue indefinitely.
> > > > The nested metatable limit is 2000 levels for Lua 5.3 (and 100 for
> > > LuaJIT).
> > >
> > > Hence "theoretically". :)
> > >
> > > I figured there were recursion limits, as in practice stack overflow
> > > become a concern.
> > It seems that nesting of "__index" metamethods results in tail calls.
> The nesting of "__index" metamethods is done in a C loop, with no
> calls at all. The limit is there only to avoid infinite loops (with
> a table inheriting from itself).
>
> -- Roberto
I think they meant metamethods as in

mt.__index = function(t, k) return t.t2[k] end

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