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



 class Multiplexer
  def initialize(*oggetti)
   @ogg=oggetti
  end
  def method_missing(metodo,*args,&blk)
   @ogg.each { |o| o.send(metodo,*args,&blk) }
  end
 end

 >> require 'multiplexer'
 => true
 >> require 'stringio'
 => true
 >> f1,f2 = StringIO.new, StringIO.new
 => [#<StringIO:0x27e17a0>, #<StringIO:0x27e1650>]
 >> m=Multiplexer.new(f1,f2)
 => #<Multiplexer:0x27d9868 @ogg=[#<StringIO:0x27e17a0>, #<StringIO:0x27e1650>]>
 >> m.puts 'ciao!'
 => [#<StringIO:0x27e17a0>, #<StringIO:0x27e1650>]
 >> f1.string
 => "ciao!\n"
 >> f2.string
 => "ciao!\n"
 => nil

 >> str,ary= 'ciao', [1]
 => ["ciao", [1]]
 >> m=Multiplexer.new(str,ary)
 => #<Multiplexer:0x27c57f8 @ogg=["ciao", [1]]>
 >> m << 'accodiamo'  # tutti e due gli oggetti rispondono a '<<'
 => ["ciaoaccodiamo", [1, "accodiamo"]]
 >> str
 => "ciaoaccodiamo"
 >> ary
 => [1, "accodiamo"]
 >> m.upcase!   # un array non sa come diventare maiuscolo!
 NoMethodError: undefined method `upcase' for [1, "accodiamo"]:Array
        from ./multiplexer.rb:6:in `send'
        from ./multiplexer.rb:6:in `method_missing'
        from ./multiplexer.rb:6:in `each'
        from ./multiplexer.rb:6:in `method_missing'
        from (irb):16
 print x if x == 'ciao'
 def method_missing(met,*arg,&blk)
   @ogg.each do |o|
    o.send(met,*arg,&blk) rescue nil
   end
  end

 >> m=Multiplexer.new('ciao',[])
 => #<Multiplexer:0x2751ea8 @ogg=["ciao", []]>
 >> m.capitalize!
 => ["Ciao", []]