From: Robert Klemme <bob.news@...>
Date: 2005-04-17T00:49:35+09:00
Subject: Re: self


"Trans" <transfire@gmail.com> schrieb im Newsbeitrag 
news:1113654704.368730.203380@l41g2000cwc.googlegroups.com...
>
> Robert Klemme wrote:
>> "Trans" <transfire@gmail.com> schrieb im Newsbeitrag
>> news:1113449849.596475.60490@z14g2000cwz.googlegroups.com...
>> > 1) use a superclass rather than a module:
>> >
>> >  class MySuperClass
>> >    def self.do_something
>> >      puts "success"
>> >    end
>> >  end
>> >
>> >  class MyClass < MySuperClass
>> >    do_something
>> >  end
>>
>> Did you verify that this works?  :-)
>
> Of course not! :-) But if that doesn't work then I need go back to
> training wheels!!! Did you verify that is doesn't? if so then then
> again! ;o)

Of course not - cause I *knew* that it does not work.  But if that comforts 
you

>> class MySuperClass
>>   def self.do_something
>>     puts "success"
>>   end
>> end
=> nil
>>
?> class MyClass < MySuperClass
>>   do_something
>> end
success
=> nil
>>

Oooops... :-)))

Looks like it's rather me that has to go back to school.  Now *you* explain 
why it works.

>> Here's what I do if I want to have a set of singleton methods
> available for
>> all classes in a class hierarchy:
>>
>> class Base
>>   module MySpecialClassMethods
>>     # make inheritance work:
>>     def inherited(cl) cl.extend MySpecialClassMethods end
>>
>>     attr_accessor :bar
>>     def foo() "foo" end
>>     # other methods...
>>   end
>>
>>   extend MySpecialClassMethods
>> end
>
> You're right, this is a great approach.

But apparently superfluous

>> class My2 < MyClass
>>   do_something
>> end
success
=> nil

Could it be that this didn't work in older versions?  I'm almost sure that I 
did try this once and it failed.  This is strange...

Thanks for crushing my certainty!

Kind regards

    robert