From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-06-23T06:00:41+09:00
Subject: Re: [ANN] traits-0.3.0

On Thu, 23 Jun 2005, Joel VanderWerf wrote:

> 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
>
> I'm not sure what those observers do, but the observable module on RAA can be 
> used orthogonally with any pair of methods #attr and #attr=, as in the 
> following example:
>
> [~] cat foo.rb
> require 'observable'
> class A
>  def foo; 3; end
>  def foo=(x); p x; end
>  extend Observable
>  observable :foo
> end
>
> a = A.new
>
> a.when_foo(Object) {|val| p "changing foo to #{val.inspect}"}
>
> a.foo = "zap"
>
> [~] ruby foo.rb
> "changing foo to 3"
> "zap"
> "changing foo to \"zap\""
>
>
> So presumably this could be used with traits without modifying either 
> library.

good because it was giving me fits ;-)  bascially it's tough to tell this

   trait 'a', 'default' => 42

from

   trait 'default' => 42

or this

   trait 'a', 'pre' => a_proc

from this

   trait 'pre' => a_proc

because i already allow this list syntax

   traits 'a', 'b', 'c' => 42', 'd' => 'forty-two'

orthogonal is good!  i didn't know about that btw... nice.

cheers.

-a
-- 
===============================================================================
| email :: ara [dot] t [dot] howard [at] noaa [dot] gov
| phone :: 303.497.6469
| My religion is very simple.  My religion is kindness.
| --Tenzin Gyatso
===============================================================================