On Thu, Nov 5, 2009 at 9:58 AM, Romain Francois
<romain.francois@dbmail.com>wrote:

> Hello,
>
> Is it possible to have the effect of UserDefinedDatabase outside of
> "attached" environments ? Can I disguise an environment of the sys.frames()
> as a UserDefinedDatabase ?
>
> This seems to suggest that it might be possible :
>
> > f <- function(){ e <- environment(); class(e) <- "UserDefinedDatabase";
> ff }
> > f()
>
>
The UserDefinedDatabase support expects an R_ObjectTable C structure
embedded within an externalptr as the HASHTAB of the environment. So it's
really only possible from C.


>  *** caught segfault ***
> address (nil), cause 'unknown'
>
> Traceback:
>  1: f()
>
> Possible actions:
> 1: abort (with core dump, if enabled)
> 2: normal R exit
> 3: exit R without saving workspace
> 4: exit R saving workspace
>
>
> At the moment, it seems to be either lookup using UserDefinedDatabase or
> regular lookup. Has anyone tried to combine both ?
>
>
> --
> Romain Francois
> Professional R Enthusiast
> +33(0) 6 28 91 30 30
> http://romainfrancois.blog.free.fr
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