On 09/05/2010 22:13, Henk Boom wrote:
> Use metatables. Accessing a key from any type
which doesn't have a metatable
> for it besides a table is an error.
>
> Cheers,
>
> Andre
>
That's what I've been doing; the question is should nil have a
metatable to make __index return nil (and perhaps print a warning)?
Printing a warning would make it pretty much
unusable as a normal feature though, so I don't see the point. It seems
to me you'd want it on all the way or not at all.
henk
I've never needed to set a metatable for nil, and the manual doesn't
make it clear (at least for me) whether it's possible or not to do
that. If it isn't I think it may be a nice feature to have.
Having the possibility to set a metatable for nil, the warning could be
emitted by the metamethods; it doesn't need to be emitted by the VM.
Not all environments where Lua runs have a console or some other mean
to output messages to the user.
Cheers,
Andre
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