From: Michal Rokos <rokosm@...>
Date: 2002-02-23T07:00:33+09:00
Subject: Re: dispatching and class references

Paul Brannan <paul@atdesk.com> wrote:
> It looks like you've frozen your container but not the objects inside.
> 
>  [pbrannan@zaphod src]$ irb
>  irb(main):001:0> a = "foo"
>  "foo"
>  irb(main):002:0> b = "bar"
>  "bar"
>  irb(main):003:0> arr = [a, b].freeze
>  ["foo", "bar"]
>  irb(main):004:0> arr[0] = 42
>  TypeError: can't modify frozen array
>          from (irb):4:in `[]='
>          from (irb):4
>  irb(main):005:0> a[0] = "b"
>  "b"
>  irb(main):006:0> p arr
>  ["boo", "bar"]
>  nil

	But objects inside are not frozen.

irb(main):012:0> c = ["A", "B"]
["A", "B"]
irb(main):013:0> c.freeze
["A", "B"]
irb(main):014:0> c.frozen?
true
irb(main):015:0> a = c[0]
"A"
irb(main):016:0> a << "XXXXXXXXXXXXXXXXXX"
"AXXXXXXXXXXXXXXXXXX"
irb(main):017:0> c
["AXXXXXXXXXXXXXXXXXX", "B"]
irb(main):018:0> c.frozen?
true

	Do we need deep_freeze?
	
		Michal
		
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Michal Rokos                           Czech Technical University, Prague
E-mail: m.rokos@sh.cvut.cz         Jabber: majkl@jabber.cz, ICQ: 36118339
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