>>708
class CounterClass
　　attr_reader :count_proc
　　def initialize
　　　　@count_proc = Proc.new{
　　　　　　counter=0
　　　　　　lambda{ counter+=1 }
　　　　}.call
　　end
end
counter1 = CounterClass.new
counter2 = CounterClass.new
p counter1.count_proc.call #=> 1
p counter1.count_proc.call #=> 2
p counter2.count_proc.call #=> 1