From: nobu.nokada@...
Date: 2004-05-26T08:41:34+09:00
Subject: Re: $SAFE idiom (Re: defining condititions)

Hi,

At Wed, 26 May 2004 08:13:25 +0900,
Joel VanderWerf wrote in [ruby-talk:101419]:
> > You don't need save $SAFE, which is always thread local.  And,
> > Proc also preserves its $SAFE value.  Though this was an
> > unofficial feature in 1.6, guaranteed from 1.8.
> 
> Hm. Didn't know that. Also, methods preserve $SAFE:
> 
> def foo; $SAFE=3; end
> # => nil
> $SAFE
> # => 0
> foo
> # => 3
> $SAFE
> # => 0

Do you mean Method object?

  $ ruby19 -ve 'def foo;$SAFE=3;$SAFE;end;p method(:foo).call;p $SAFE'
  ruby 1.9.0 (2004-05-25) [i686-linux]
  3
  0

  $ ruby19 -ve 'def foo;$SAFE=3;$SAFE;end;p foo;p $SAFE'
  ruby 1.9.0 (2004-05-25) [i686-linux]
  3
  3

  $ ruby18 -ve 'def foo;$SAFE=3;$SAFE;end;p foo;p $SAFE'
  ruby 1.8.2 (2004-05-24) [i686-linux]
  3
  3

-- 
Nobu Nakada