From: "K.Kosako" <kosako@...>
Date: 2001-01-19T12:46:45+09:00
Subject: [ruby-talk:9535] Re: Strange Hash behavior

Hash use "eql?" method for key equality.

class C
  def initialize(obj)
    @o = obj
  end
  def hash
    @o.hash
  end
  def o
    @o
  end
  def eql?(obj)
    @o.eql?(obj.o)
  end
  def inspect
    @o.inspect
  end
end

h = {}
h[C.new(1)] = 1
h[C.new(1)] = 2
puts h.inspect     #=> {1=>2}
----
K.Kosako