cout.rb

module Kernel
  def std
    @@std ||= Module.new do
      def ios
        Module.new do
          def ios
            @@ios ||= Class.new do
              def initialize stream
                @stream = stream
              end
            end
          end
        end
      end
    
      def istream
        Module.new do
          include std::ios
          def istream
            @@istream ||= Class.new(std::ios) do
              def initialize stream
                super stream
              end
              
              def get
                @stream.read
              end
            end
          end
        end
      end
      
      def ostream
        Module.new do
          include std::ios
          def ostream
            @@ostream ||= Class.new(std::ios) do
              def initialize stream
                super stream
              end
              
              def << rhs
                @stream.write rhs
                self
              end
            end
          end
        end
      end
      
      def iostream    
        Module.new do
          include std::istream
          include std::ostream
        
          def cout
            @@cout ||= std::ostream.new(STDOUT)
          end
          
          def cerr
            @@cerr ||= std::ostream.new(STDERR)
          end
          
          def cin
            @@cin ||= std::istream.new(STDIN)
          end
          
          def endl
            "\n"
          end
        end
      end
    end
  end
end

include std

What have you done?.. :-(