From: David Maciejak <david.maciejak@...>
Date: 2009-06-09T18:52:12+09:00
Subject: ruby dup unexpected behaviour

Hi,

I got no answer on ubuntu entry at
https://bugs.launchpad.net/ubuntu/+source/ruby1.8/+bug/384265
so I resend it here. Does someone have any clues on this ?

Thanks,
david


--------------------------------------------------------------------------------------

Hi,

got some strange result in ruby1.8 (1.8.7.72-3) on jaunty (up to date).
Don't know if I use correctly dup function but my duped hash is
modified even if i call the freeze method. Below the quick and dirty
test case showing that @c member of the class Global is modified


#!/usr/bin/ruby

class Testme
 attr_accessor :value
 def initialize(val)
  @value=val
 end
 def Testme::bou(val)
  $a["b"].value=val
 end
 def to_str()
  print @value,"\n"
 end
end

class Global

 def initialize
  @c=nil
 end

 def go()
  @c=$a.dup
  @c.freeze
  #print value before the changes
  to_str()
 end
 def to_str()
  print @c,"\n"
 end

end

$a=Hash.new
$a["a"]=Testme.new(1)
$a["b"]=Testme.new(2)

main=Global.new
main.go()
Testme::bou(3)
#print value after the changes
main.to_str()