From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-06-22T23:36:10+09:00
Subject: Re: [ANN] traits-0.3.0

On Wed, 22 Jun 2005, Ralph "PJPizza" Siegler wrote:

> On Wed, Jun 22, 2005 at 09:18:13PM +0900, Ara.T.Howard wrote:
>>
>> URLS
>>
>>   http://raa.ruby-lang.org/search.rhtml?search=traits
>>   http://codeforpeople.com/lib/ruby/traits
>>
>> ABOUT
>>
>>   traits.rb aims to be a better set of attr_* methods and encourages better
>>   living through meta-programming and uniform access priciples.  traits.rb
>>   supercedes attributes.rb.  why?  the name is shorter ;-)
>
> Hello Ara,
>
> would it be possible to have a kind  of observer on traits, kind of like Apple/obc/cocoa's   KVO?
>
> Ralph "PJPizza" Siegler

can you give me a little code snippet to show how you'd like it to look?  i'm
imagining something like

   class C
     has 'a', 'default' => 42,
              'pre' => proc{|this| puts "pre a : #{ this.a }"},
              'post' => proc{|this| puts "post a : #{ this.a }"},
   end

   obj = C::new
   obj.a('forty-two')

would result in

   pre a : 42
   post a : forty-two

being printed

or were you thinking more like

   class C
     some_observer = SomeObserver::new

     has 'a', 'default' => 42,
              'observer' => some_observer
   end

and observer.notify(self, value) would be called or something?

cheers.

-a
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