From: Jim Freeze <jim@...>
Date: 2001-05-18T02:27:11+09:00
Subject: [ruby-talk:15334] How do I copy an object?

Hi:

I want to copy an object that contains an array.
I want the new object to have its own array, not
a pointer to the original array. How is this done?
I have tried direct asignment, .dup and .clone,
but none work.

Here is some sample code:
class Stmt
  def initialize
    @s = []
    @s << "text 1"
    @s << "text 2"
  end

  def []=(i,val)
    @s[i] = val
  end

  def [](i)
    @s[i]
  end
end

def func(s)
  locals = s.dup  # have tried s, s.dup and s.clone
-----------^^^^^  # How do I get a local copy of object s?
  locals[0] = "local change"
end

## main
  s = Stmt.new

  puts s[0]
  func(s)
  puts s[0]
## end#main

With output:
text 1
local change

Thanks

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