gistfile1.txt

[12] pry(main):1> class O
[12] pry(main):1*   def self.new(*args, &block)
[12] pry(main):1*     @counter ||= 0
[12] pry(main):1*     @counter += 1
[12] pry(main):1*     super
[12] pry(main):1*   end
[12] pry(main):1* end
=> nil
[13] pry(main):1> O.new
=> #<O:0x4484b20>
[14] pry(main):1> O.instance_eval { @counter }
=> 1
[15] pry(main):1> O.new
=> #<O:0x45bd3d8>
[16] pry(main):1> O.instance_eval { @counter }
=> 2
[17] pry(main):1>