forwardable を拡張する

forwardable.rb

require 'forwardable'

module Forwardable

  def delegate_to(accessor, *methods, **method_hash)
    methods.each do|method|
      def_instance_delegator(accessor, method)
    end
    method_hash.each do|method, ali|
      def_instance_delegator(accessor, method, ali)
    end
  end

end

class Queue

  extend Forwardable

  delegate_to :@array,
    :each,
    :push  => :enq,
    :shift => :deq

  def initialize
    @array = []
  end

end

q = Queue.new

q.enq 1
q.enq 2
q.enq 3
q.enq 4
q.enq 5

while n = q.deq
  p n
end