From: Jim Freeze <jim@...>
Date: 2001-05-18T03:08:55+09:00
Subject: [ruby-talk:15335] Re: How to clone an object?

Sorry for responding to my own post, but the
text below may be a bit more clear.

I have run across the following interesting situtation:

class K
  attr_accessor :a
  def initialize
    @a = [1,2]
  end
end

k1 = K.new
k2 =k1.clone

## Choose one of the next two line
k2.a = [4,5]   -> #<K:0xe6170  @a=[1, 2]>
                  #<K:0xe60e0  @a=[4, 5]>

k2.a[0] = 5    -> #<K:0xe6140  @a=[5, 2]>
               -> #<K:0xe60b0  @a=[5, 2]>

puts k1.inspect
puts k2.inspect
----

I guess that
k2.a = <array>
is assigning a new array to k2.a
while
k2.a[n] = <value>
keeps the same array object in k2.a

The question is, how do I get a copy of
k2 where k2.a is a copy of k1.a and not a reference?

Thanks
=========================================================
Jim Freeze
jim@freeze.org
---------------------------------------------------------
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http://www.freeze.org
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