From: Rick DeNatale <rick.denatale@...>
Date: 2009-12-21T13:16:15+09:00
Subject: [ruby-core:27258] Re: [Feature #2509] Recursive freezing?

On Sun, Dec 20, 2009 at 11:02 PM, Shyouhei Urabe <redmine@ruby-lang.org> wrote:
> Issue #2509 has been updated by Shyouhei Urabe.
>
>
>> It would be very nice if there was an easy way to freeze recursively arrays, hashes, etc...
>
> The difficult part is those "etc". �Imagine how can you freeze a lambda and its "everything"?
>
> �irb(main):001:0> a = 0
> �=> 0
> �irb(main):002:0> p = lambda { p a }.freeze
> �=> #<Proc:0x00007fc681b2e310@(irb):2>
> �irb(main):003:0> p.frozen?
> �=> true
> �irb(main):004:0> a = 1
> �=> 1
> �irb(main):005:0> p.call
> �1
> �=> nil
> �irb(main):006:0>
>

The other danger to consider is where does 'everything' end.  This
made me think of Ice Nine from Kurt Vonnegut's Cat's Cradle

http://en.wikipedia.org/wiki/Ice-nine

-- 
Rick DeNatale

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