Marshalling

gistfile1.rb

class Test
  
  attr_reader :value
  
  def self.value_by_block(&block)
    @evaluator = block
  end

  def initialize
    @value = self.class.instance_variable_get(:@evaluator).call
  end

end

class TestSubClass < Test

  value_by_block { 2 + 2 }

end

my_instance = TestSubClass.new
p my_instance.value
p my_instance.class.instance_variable_get(:@evaluator)

data = Marshal.dump(my_instance)
my_reloaded_instance = Marshal.load(data)

p my_reloaded_instance.value
p my_reloaded_instance.class.instance_variable_get(:@evaluator)