gistfile1.rbx

####
# ( ++   B ).to_i #=> 3
# ( ++-  B ).to_i #=> 6
# ( ++-+ B ).to_i #=> 13
# ( 0 + ++-+ B )  #=> 13
class B
  class << self
    def +@; new.send(:"+@"); end
    def -@; new.send(:"-@"); end
  end

  def initialize
    @stack = []
  end

  def +@
    @stack << 1
    self
  end

  def -@
    @stack << 0
    self
  end

  def to_i
    @stack.reverse.inject(0) { |m,v| (m << 1) ^ v }
  end

  def coerce o
    [o, to_i]
  end
end