From: Joel VanderWerf <vjoel@...>
Date: 2009-08-11T05:43:12+09:00
Subject: Re: instance_variables vs. local_variables

David Whetstone wrote:
> So the implication here is that there is no way to define a local 
> variable at run time.  Investigating this question is, in fact, what 
> lead me the above discovery.  This is disappointing if true.
> 
> I can use method_missing to simulate late binding of local variables, 
> but it is inefficient to have method_missing called every time such a 
> variable is referenced. (No, I have not profiled to see if this is 
> really a performance concern, it just smells bad to me.)
> 
> Am I correct?  Is what I would like to do currently impossible?

If you are eval-ing code, then you can eval against a binding, and 
define locals at run time in that binding:

def get_empty_binding
   binding
end
b = get_empty_binding

eval("a=1", b)
p eval("a", b) # ==> 1

Not sure this is what you're looking for.

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407