From: Anders Bengtsson <ndrsbngtssn@...>
Date: 2001-04-17T20:07:12+09:00
Subject: [ruby-talk:13740] Wrapping objects

Hi everyone,

I'm developing a simple persistence mechanism for Ruby
using wrappers (or proxies) around objects.
Is it possible somehow to override the constructors of
a class so that it will always return an instance of
another class?

Something like this:

class PersistentWrapper
    def initialize(persistable)
       #...
    end
end

module Persistable
    #...
end

class Foo
    include Persistable
    #...
end

Foo.new   # ==> an instance of PersistentWrapper

.. that is, every class that has Persistable mixed in
should return wrapped instances, instead of the
instances directly.
I've looked at the various callback methods in Module,
but I haven't figured out any way to do this yet. Does
anyone have any ideas on how to do this?

thanks,

/Anders

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__________________________________________________
Anders Bengtsson              ndrsbngtssn@yahoo.se
Stockholm, Sweden

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