How to reverse an array in Ruby in O(1)

class ReverseArray < Struct.new(:array)
  include Enumerable
  def each(&blk)
    i = array.length - 1
    while i >= 0 do
      yield array[i]
      i -= 1
    end 
  end
end

array = (0..10000).to_a
reverse_array = ReverseArray.new(array)

array.last == reverse_array.first
=> true