From: ptkwt@...1.aracnet.com (Phil Tomson)
Date: 2002-11-17T07:26:13+09:00
Subject: Re: Proc#binding ?

In article <3DD6AC3E.1020804@path.berkeley.edu>,
Joel VanderWerf  <vjoel@PATH.Berkeley.EDU> wrote:
>Phil Tomson wrote:
>> Just a thinking out loud here, I have no pressing need for this, but...
>> We've got Kernel#binding which returns the Binding object of the current 
>> execution context.  It would seem that Proc objects also have bindings as 
>> well, but there is no Proc#binding method that allows us to access them.
>> Should there be?
>
>Seems to be there in 1.7.3. But you could always implement it with eval:
>
>class Proc
>   def get_binding
>     eval "binding", self
>   end
>end
>
>class A
>   def foo
>     x = 1
>     Proc.new {}
>   end
>end
>
>pr = A.new.foo
>
>p (eval "x", pr.binding)
I think this will report a private method access error.

>p (eval "x", pr.get_binding)
>
>
Hmmm....  actually even in 1.7.3 Proc#binding seems to be a private 
method:

irb(main):001:0> a = proc { i = 5; puts i; }
#<Proc:0x401fb380>
irb(main):002:0> a.binding
NameError: private method `binding' called for #<Proc:0x401fb380>
        from (irb):2

but it looks like your get_binding method definition will work.

Phil