From: "Damián M. González" <lists@...>
Date: 2012-09-18T12:50:00+09:00
Subject: Re: "Anonymous classes or modules", what they are? (Marshaling)

> The alternative would be to return an anonymous class with the state of
> Foo at the time when f was serialized. However that's not an accurate
> representation of f (it wasn't pointing to an anonymous class, it was
> pointing to Foo). Moreover, we can't serialise anonymous classes anyway,
> because that would mean serializing all the methods of that class.

 Correct me if I'm wrong: the only way that I see to save the state of a
class object(like Foo in your example with his variable @count), is
appeal to some methods that save the current state and then load it
again when the programm start, something like this:

######################################################

class Foo
  @x = 1
  class << self
    attr_accessor :x
    def save_state
      a = Object.new
      a.instance_eval do
        @x = Foo.x
      end
      File.open('Foo_state.mrs', 'w+') do |f|
        Marshal.dump(a, f)
      end
    end
    def load_state
      b = Marshal.load(File.open('Foo_state.mrs').read)
      Foo.x = b.instance_variable_get(:@x)
    end
  end
end

if File.exist?('Foo_state.mrs') then Foo.load_state end

########################################################

#Start the program for the first time
Foo.x
#=> 1
Foo.x = 5
#=> 5
Foo.save_state
#=> #<File:Foo_state.mrs (closed)>
#Here I close the program....

#Then I start it again
Foo.x
#=> 5
#Was correctly saved and loaded

 I'll wait for your answers :)

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