From: Peter Ertl <pertl@...>
Date: 2006-03-24T21:38:29+09:00
Subject: iterator class not working

Hi,

in order to understand ruby better (and for fun reasons of course) I try to
write an iterator class. this way I want to understand  'binding' and
'callcc' better.

however, it does not work! :-(

any help will be greatly appreciated!!!

---------------------------------------------

class Iterator

  def initialize(enum)
    @context = binding
  end

  def next
    enum = eval("enum", @context)
    @context, item = callcc do |cont|
      enum.each do |item|
        cont.call binding, item
      end
    end
    item
  end

end

names = %w{mary gordy john jane elwood}

it = Iterator.new(names)

3.times do
  puts it.next
end

> mary
> mary
> mary

Best regards
Peter