From: Doug Glidden <41mortimer@...>
Date: 2008-09-09T03:20:42+09:00
Subject: Re: "Pointer" to an object? (i.e. reflect changes to origina

Calamitas wrote:
[snip]
> Or closer to the pointer solution you want:
> 
>   p.primary_email = lambda { p.personal_email }
>   p.personal_email = 'me@gmail.com'
>   puts p.primary_email.call
> 
> The lambda expression corresponds to the address operator, the .call
> corresponds to a pointer dereference.
> 
> Peter

Peter,

Thanks!  I had just (literally within the last ten minutes) thought of 
the possibility of using an enclosure of some sort to do the trick.  I 
was playing around with using a proc, you used a lambda, I think either 
one will probably work with some tweaking.  This is the "perfect" 
solution, I think.

I'm a little curious how this will react if p.primary_email.call is 
executed when p is not in scope, e.g. if something like the following 
occurs, so I'm going to play around:

  def do_something(person)
    email = person.primary_email.call
    # do more stuff...
  end

  p = Person.new
  p.personal_email = 'me@home.com'
  p.primary_email = lambda {p.personal_email}
  do_something p

Will the lambda be able to handle that situation?  Like I said, I'm 
going to play around with it.

Thanks again,
Doug
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