Re: Lua registry, environment, and threads.

[Frank Meier-Dörnberg <frank@...>]

Frank Meier-Dörnberg schrieb:
> Leo Razoumov schrieb:
> > On 2010-01-09, steve donovan <steve.j.donovan@gmail.com> wrote:
> >  
> > >  (BTW, a safer 5.2 idom is:
> > >
> > >  local loadstring = loadstring
> > >  in {x = 1, y = 10} do fn = loadstring 'return x + y' end
> > >
> > >  Given that loadstring is potentially a nasty function in a sandbox)
> > >
> > >  steve d.
> > >     
> >
> > Can one do the following instead?
> >
> > local fn = loadstring 'return x + y' --first compile the chunk for 
> > future use
> >
> > in {x = 1, y = 10, print=print} do print(fn()) end  -- 11
> > in {x = 2, y = 20, print=print} do print(fn()) end  -- 22
> >
> > --Leo--
> >
> >   
> Potentially I totally missed the point, but if isolation is the 
> problem, what is with (untestet):
>
> local fn = loadstring ' function(env) do' .. 'return x + y' .. 'end'
Ehm, I mean:

local fn = loadstring ' function(env) do in env do ' .. 'return x + y' 
..  ' end end'
> in {} do print(fn{x = 1, y = 10, print=print}) end -- 11
> in {} do print(fn{x = 2, y = 20, print=print}) end -- 22
>
> ?
> Frank