From: dblack@...
Date: 2006-10-12T04:13:33+09:00
Subject: Re: Singleton Class Constants

Hi --

On Thu, 12 Oct 2006, ara.t.howard@noaa.gov wrote:

> On Thu, 12 Oct 2006 jdance@gmail.com wrote:
>
>> 
>> class Object
>>  def singleton_class
>>    class << self; self; end
>>  end
>> end
>
> fyi.  i prefer
>
>  class Object
>    def singleton_class &block
>      sc = class << self; self; end
>      block ? sc.module_eval(&block) : sc
>    end
>  end
>
> for it allows
>
>  class C
>    singleton_class{
>      attr 'a'
>      alias_method 'b', 'a'
>    }
>  end

I prefer it without that, since that makes it deviate from the #class
method, which it's otherwise precisely parallel to.  I'd rather that
singleton_class work like class than that it work like class_eval.
Otherwise you've got a situation where all classes except singleton
classes have to call class_eval, and I don't see any grounds for
granting that privilege.

(I know we've hashed through this before, and don't agree; I just
wanted to summarize the dissident position :-)


David

-- 
                   David A. Black | dblack@wobblini.net
Author of "Ruby for Rails"   [1] | Ruby/Rails training & consultancy [3]
DABlog (DAB's Weblog)        [2] | Co-director, Ruby Central, Inc.   [4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org