From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-06-16T01:01:11+09:00
Subject: Re: Why the lack of mixing-in support for Class methods?

#class_extension is now private, the magic has been moved to 
#append_features, and #class_extension has been undefined in Class, per 
T's request.

   class Module
     alias_method :__append_features__, :append_features

     def class_extension(&block)
       @class_extension ||= Module.new do
         def self.append_features(mod)
           __append_features__(mod)
         end
       end
       @class_extension.module_eval(&block) if block_given?
       @class_extension
     end

     private :class_extension

     def append_features(mod)
       __append_features__(mod)
       mod.extend(class_extension)
       if mod.instance_of? Module
         mod.send(:class_extension).send(:include, class_extension)
       end
     end
   end

   class Class
     undef_method :class_extension
   end

#send must of course be replaced with #funcall in 1.9 -- has there been 
any progress with the naming of that? I checked the archives, but 
couldn't find anything never than August '05... it sounds like a "fun 
call", if you know what I mean... hopefully you don't.


Daniel