From: matz@... (Yukihiro Matsumoto)
Date: 2001-11-24T01:09:42+09:00
Subject: [ruby-talk:26238] Re: OO Singletons and Marshalling (bug?)

Hi,

In message "[ruby-talk:25963] OO Singletons and Marshalling (bug?)"
    on 01/11/21, chr_news@gmx.net <chr_news@gmx.net> writes:

|the current (i.e. cvs) implementation of the  OO Singleton pattern has 
|no strategy with respect to marshalling - the following script illustrates
|the problem.
|
|---------------
|require 'singleton'
|class A
|   include Singleton
|end
|
|resurrect = Marshal.load(Marshal.dump(A.instance))
|p resurrect == A.instance # => false
|---------------
|
|The attached script fixes this problem - it is a variation of
|the current cvs strategy and implements the following idea
|*  Ensure that only one instance of the class can be (regularly)
|   created
|*  The ``instance'' is created at ``instanciation time'' - i.e. 
|   the first call of #instance
|*  This behavior is preserved under inheritance

I like this one.  Can I merge it to the standard distribution, under
the terms identical to the rest of Ruby?

							matz.