From: Jim Weirich <jweirich@...>
Date: 2003-05-21T11:46:51+09:00
Subject: Re: An Object Going Out Of Scope

On Tue, 2003-05-20 at 16:14, MikkelFJ wrote:
> 
> "Jim Weirich" <jweirich@one.net> wrote in message
> >    auto(foo=MyObject.new, :cleanup) do
> >      # use foo
> >    end
> 
> fine if you can handle multiple objects this way. Mauricios suggestion does
> that, but does not allow you to specify cleanup method. This, of course can
> be done in many ways.

The syntax is not a big deal.  One idea is to allow "auto" to take a
list of variables.  Here's another idea that's more general approach
(although a bit more verbose ...)

  auto_block do |closer|
    a = closer.register(Thing.new) { |thing| thing.close }
    b = closer.register(Stuff.new) { |x| x.shut_down }
    # do stuff with a & b...
  end  # closer will close anything registered with it.

-- 
-- Jim Weirich     jweirich@one.net    http://jimweirich.umlcoop.net
---------------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct, 
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)