#!/usr/bin/env ruby
# This code comes from http://ruby-it.org/pages/Iteratori+Esterni
# Check the page for copyright notice and explanations



 irb(main):001:0> require 'generator'
 => true
 irb(main):002:0> a=[1,3,5,7,9] # un Array, un oggetto Enumerable
 => [1, 3, 5, 7, 9]
 irb(main):003:0> g=Generator.new a
 => #<Generator:0x27dcd40 @queue=[1], @cont_endp=nil, @index=0, @block=#<Proc:0x
 27db600@C:/Programmi/ruby-1.8/ruby/lib/ruby/1.8/generator.rb:69>, @cont_yield=#
 Continuation:0x27dca70>, @cont_next=nil>
 irb(main):004:0> g.current
 => 1
 irb(main):005:0> g.next
 => 1
 irb(main):006:0> g.next
 => 3
 irb(main):007:0> g.next
 => 5
 irb(main):008:0> g.next?
 => true
 irb(main):009:0> g.next
 => 7
 irb(main):010:0> g.next?
 => true
 irb(main):011:0> g.next
 => 9
 irb(main):012:0> g.next?
 => false