From: Lionel Thiry <lthiryidontwantspam@...>
Date: 2005-05-15T10:00:29+09:00
Subject: infinite number of singleton_classes

Hello!

----8<----
a = Object.new

b = class << a
 class << self
  class << self
   class << self
    # "class << self".times(n)
     self
    # "end".times(n)
   end
  end
 end
end
# => #<Class:#<Class:#<Class:#<Class:#<Object:0x2aa8348>>>>>
----8<----

How many levels can we reach? It seems there is no limit.

I suppose those singleton_class exists only when needed? Otherwise, I really
wonder where does ruby hide all those singleton_classes...

But, sincerely, is it needed to have the singleton_class of a singleton_class?
Isn't it a non-sense? Shouldn't this raise an error?

---8<---
a = Object.new

begin
 b = class << a
  class << self
   self
  end
 end
rescue NewError
 puts "Sincerely, you don't need the singleton_class of the singleton_class!"
end
---8<---

What do you think of it? Isn't it worth an RCR?

-- 
Lionel Thiry

Personal website: http://users.skynet.be/lthiry/