delegate.rb

#simple delegate, can not use in production
class Module
  def delegate(*methods)
    options = methods.pop
    unless options.is_a?(Hash) && to = options[:to]
      raise ArgumentError, "Delegation need a target.Supply an options with a :to key as the last argument(e.g. delegate :hello, to: :greet"
    end
    to = to.to_s

    file, line = caller(1,1).first.split(':')
    line = line.to_i

    methods.each do |method|
      module_eval <<~EOF, file, line
      def #{method}(*args, &block)
        _ = #{to}
        _.#{method}(*args, &block)
      end
      EOF
    end
  end
end
class Stack
  attr_reader :que
  def initialize()
    @que = []
  end
  delegate :push, :pop, to: :que
end
Stack.new.push 1