Re: userdata environment

[Mark Hamburg <mark@...>]

On Sep 13, 2009, at 11:55 PM, Juris Kalnins wrote:

> On Sat, 12 Sep 2009 21:30:30 +0300, Mark Hamburg <mark@grubmah.com>  
> wrote:
>
> > Personally, on Lightroom, I wished for the ability to store nil in  
> > the userdata environment table.
>
> That's harder. Currently it's a pointer to something that can be put  
> in GC
> list, which excludes nil, bools, numbers and lightuserdata. Changing  
> that
> would be a much bigger patch, and would increase size of userdata  
> header.

Nil doesn't require an expansion of the data structures since a NULL  
pointer will do. It does require an expansion in the C code to deal  
with that case but possibly not much more than the expansion needed to  
handle types other than a table.

Mark