Implement "i++" style incremention in ruby.

inc.rb

class NumberProxy < BasicObject
  def initialize number
    @number = number
  end

  def method_missing *args
    @number.send *args
  end

  def inc!
    @number += 1
  end

  def coerce other
    return self, other
  end

  def to_ary
    [@number]
  end
end

class Numeric
  def proxy
    NumberProxy.new self
  end
end


n = 5.proxy
n.inc!
thirty_six = n * n

i = 0.proxy
while i.inc! <= 10
  puts i
end