From: Adam Prescott <adam@...>
Date: 2011-04-05T21:50:07+09:00
Subject: Re: Autoconvert object from one class1 to other class2 in class1 def

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On Tue, Apr 5, 2011 at 10:15 AM, Luk Mus <support@fit4u.su> wrote:

> Brian Candler wrote in post #990955:
> >> or how get name of variable in class method?
> >
> > That's not possible either. The same object could be pointed to by many
> > variables (local and/or global and/or instance), or by none. For
> > example, maybe the only reference to the object is as a value in a Hash.
>
> Thanks!
>
> But i can get object_id:
>
> class String
>  def get_id
>    puts self.__id__
>    puts self.object_id
>  end
> end
>
> Is it realy to get name by ID?


I suppose just for the local variable case, you could use Kernel's
`local_variables`, combined with a binding, and having a single reference to
the object you're trying to find all local variable references to. ("_" here
is because of irb.)

Equivalent gist paste for the below: https://gist.github.com/903529

>> local_variables
=> ["_"]
>> a = ""
=> ""
>> local_variables
=> ["_", "a"]
>> b = binding; local_variables.select { |var| b.eval(var).object_id ==
a.object_id }
=> ["a"]
>> x = a
=> ""
>> local_variables
=> ["_", "a", "b", "x"]
>> b = binding; local_variables.select { |var| b.eval(var).object_id ==
a.object_id }
=> ["a", "x"]

Not a very useful exercise, though, I think, more an interesting one.

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