require 'memor'

  class Foo
    include Memor

    attr_accessor :age

    def slow_method1
      memor binding do
        # slow stuff
      end
    end

    def slow_method2(a, b)
      memor binding do
        # slow stuff
      end
    end

    def slow_method3(a, *args)
      memor binding do
        # slow stuff
      end
    end

    def double_age
      # this block would explicitly depend on the 'age' state of current instance
      memor binding, :age do
        age * 2
      end
    end

  end

  foo = Foo.new

  foo.age = 2
  foo.double_age # 4

  foo.age = 3
  foo.double_age # 6