You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pad.rb
    path of file: ./repos/truffleruby/bench/optcarrot/lib/optcarrot
    
    the code of the file until where you have to start completion: module Optcarrot
  # Pad pair implementation (NES has two built-in game pad.)
  class Pads
    def inspect
      "#<#{ self.class }>"
    end

    ###########################################################################
    # initialization

 
    
    def poll_state
      state = @buttons

      # prohibit impossible simultaneous keydown (right and left, up and down)
      state &= 0b11001111 if state & 0b00110000 == 0b00110000
      state &= 0b00111111 if state & 0b11000000 == 0b11000000

      state
    end

    attr_accessor :buttons
  end