From: Lionel Thiry <lthiryidontwantspam@...>
Date: 2005-04-19T02:14:36+09:00
Subject: Re: [ANN] Article: Seeing Metaclasses Clearly

mark sparshatt a �crit :
> why the lucky stiff wrote:
> 
>> I've written a very nuts+bolts article on metaclasses (aka virtual 
>> classes or metaobjects), since they still lurk under a shroud of fear 
>> and enigma.
>>
>> <http://whytheluckystiff.net/articles/seeingMetaclassesClearly.html>
>>
>> I'm hoping this will help uncover the truth.  If anything is unclear, 
>> please report it.  Shed a light.
>>
> 
> One thing I found confusing was the comment for the class_def method
> 
>  ># Just defines a class method
>  >def class_def name, &blk
>  >  class_eval { define_method name, &blk }
>  >end
> 
> 
> However it actually defines an instance method
> 
> require "metaid"
> 
> class MyClass
>   class_def "class_method" do puts "success" end
> end
> 
> MyClass.class_method
>   #=> undefined method "class_method" for MyClass:Class
> 
> MyClass.new.class_method #=> success
> 

The only I've found to make your sample code work is to refactor class_def this way:
  def class_def name, &blk
   meta_eval { define_method name, &blk }
  end

I personnaly feel it weird I could not realise this whithout the help of the 
metaclass manipulation methods _why has added.

--
Lionel Thiry