From: Yuguo Wang <yxw@...>
Date: 2001-07-31T21:32:02+09:00
Subject: [ruby-talk:18884] Re: Rubywin uses hard-coded "/cygdrive" prefix.

Hi, all:
  I am a new user of Ruby. Could anyone please tell me why in the
follwoing code, the string object is copied while the array is not. To
my understanding, dup and clone both should do shallow copy.
  Thanks a lot.

class A
	attr_accessor :str, :ary
	def initialize
		@str = "hello"
		@ary =[1,2,3,4]
	end

	def to_s
		puts "Str: #{@str}, Array: #{@ary} \n"
	end
end

a = A.new
b = a.dup
a.to_s           ->Str: hello, Array: 1234
b.to_s           ->Str: hello, Array: 1234
b.str = "Hello"
b.ary[0]="cat"
a.to_s           ->Str: hello, Array:cat234
b.to_s           ->Str: Hello, Array:cat234