[dennou-ruby:000099] Re: deep copy

[gotoken@xxxxxx (GOTO Kentaro)]

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In message "[dennou-ruby:000098] deep copy"
    on 99/09/23, Takeshi Horinouchi <horinout@xxxxxx> writes:

>dup �ä� shallow �ʥ��ԡ��Ǥ���͡�deep �ʥ��ԡ���Ȥ���ˡ�Ϥʤ�

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>�������ѿ��˴ؤ��Ƥ��� dup ���Ƥ����Ф����ΤǤ�����
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>  instance_variables.each{|i| i=org.i.dup}
>
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module DeepCopieable
  def deep_copy
    res = self.dup
    instance_variables.each{|v| 
      res.instance_eval "#{v} = #{v}.clone" 
    }
    res
  end
end

class Foo
  include DeepCopieable
  attr_accessor :a, :b
end

foo = Foo.new
foo.a = "helo"
foo.b = ["hi"]
bar = foo.deep_copy
p [foo.a.id, bar.a.id] # id returns an unique value for each objects
p [foo.b[0].id, bar.b[0].id]  # containers are not supported

-- gotoken