Re: Why no pairs() for userdata, __len for tables?

["Anders Bergh" <anders1@...>]

One minor note: this can be done with Lua metatables aswell. It's not
limited to userdatum. I'm sure you know that already, but for those
who don't :-)

On 4/19/07, Rici Lake <lua@ricilake.net> wrote:
> Sam Roberts wrote:
> > On Thu, Apr 19, 2007 at 11:53:15AM -0700, Mark Hamburg wrote:
> >> Except that you can't get to userdata metatables from pure Lua. But one
> >> could certainly replace pairs with a C function that did this and you don't
> >> need to patch the Lua sources to do it.
> >
> > Maybe I misunderstand "get to", but  it appears that I can access
> > userdata from the io library. Is this a version thing?
>
> You can get the metatable of a userdata if it hasn't been locked
> with a __metatable key. Many of us routinely set this key, though,
> in order to protect the metatable


--
Anders