gistfile1.ex

defmodule Bitmap do
  defstruct value: 0

  defimpl Access do
    use Bitwise
    def access(%Bitmap{value: value}, bit) do
      if (value &&& (1 <<< bit)) == 0, do: 0, else: 1
    end
  end

end

fifty = %Bitmap{value: 50}

[5,4,3,2,1,0] |> Enum.each(fn bit -> IO.puts fifty[bit] end)