From: Michael Neumann <mneumann@...>
Date: 2004-05-01T23:18:17+09:00
Subject: Don't understand hashing...

Hi,

Don't know why this happens:

  class Lazy
    self.methods.reject{|m| m =~ /^__(.*)__$/}.each {|m| 
      eval "def #{m}(*args, &block) __getobj__.send(:'#{m}', *args, &block) end"
    }

    def initialize(&block)
      @block = block
    end

    def __getobj__
      if @block
        @value = @block.call(*@args)
        @block = nil
      end
      return @value
    end

    def method_missing(id, *args, &block)
      __getobj__.send(id, *args, &block)
    end

    def hash
      __getobj__.hash
    end
  end

  id1 = Lazy.new {:Id}
  id2 = :Id

  p id1.hash == id2.hash # => true

  h1 = {}
  h2 = {}
  h1[id1] = "id1"
  h2[id2] = "id2"

  p h1[id2] # => nil  (expect: "id1")
  p h2[id1] # => "id2"

I would have expected "id1" for h1[id2].
Can someone enlighten me?

Thanks.

  Michael