From: Robert Klemme <shortcutter@...>
Date: 2011-08-02T16:30:38+09:00
Subject: Re: system stack error in ObjectSpace.each_object

luke gruber wrote in post #1014312:
>> I assume you created some weird kind of recursion via
>> define_finalizer.  I'm not really sure what's going on.  Can you
>> explain what your code is supposed to do?

> Yeah, it was just for fun and to learn some of these metaprogramming
> methods, but what I was meaning to do was to be able to make a 'leader'
> object of, say, class Foo. Upon choosing the leader object, you have to
> choose a subordinate class to lead (which could be the same class as the
> leader object, ie: Foo.
>
> Basically the implementation was to take all the objects of the
> subordinate class, then override all of the instance methods in the
> leader object's class by putting new methods in the leader's singleton
> class with the same name as the instance methods in the leader's class.
> Every time these new 'leader' methods are called (ie: the leader
> responds to a method that's defined in the leader's own class), it sends
> the same method (with the same args &block) to all the subordinate
> objects.

Not sure what this is supposed to do but I would always make the
connection between those objects explicit.  And I would separate the
leading from determining the set of instances to lead.  Here's one way

class Leader < BasicObject
  def lead(source)
    @objs = source
  end

  def method_missing(*a,&b)
    @objs.map {|o| o.send(*a,&b)}
  end
end

class Module
  Source = Struct.new :cl do
    include Enumerable

    def each(&b)
      return to_enum(:each) unless b
      ObjectSpace.each_object(cl, &b)
      self
    end
  end

  def lemmings
    Source.new self
  end
end

l = Leader.new
l.lead Hash.lemmings

p l.size

Kind regards

robert

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