From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-05-20T01:15:39+09:00
Subject: Re: An Object Going Out Of Scope

On Tue, May 20, 2003 at 12:55:59AM +0900, MikkelFJ wrote:
> 
> "MikkelFJ" <mikkelfj-anti-spam@bigfoot.com> wrote in message
> news:3ec7e99c$0$83055$edfadb0f@dtext01.news.tele.dk...
> 
> > { auto(:foo, :cleanup); foo = foo.new } # calling foo.cleanup on scope
> exit
> 
> Thinking about it... isn't this what ensure does?
> 
> begin
>  foo.new
> ensure
>   foo.cleanup
> end
> 
> 
> or from PickAxe
> 
> f = File.open("testfile")
> begin
>   # .. process
> rescue
>   # .. handle error
> else
>   puts "Congratulations-- no errors!"
> ensure
>   f.close unless f.nil?
> end
> 

This makes me think of that posting were somebody wanted to rebind a
proc. If that were possible, we'd be able to do

def auto(*vars, &block)
   begin
     block.rebind(binding).call
   ensure
     vars.each { |x| eval "#{x}.cleanup if #{x}" }
   end
end

or something like that and then

auto(:a,:b) {
 a = Foo.new
 b = Foo.new
}

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