From: Trans <transfire@...>
Date: 2006-11-09T03:55:13+09:00
Subject: Re: Proc as Observer


Tim Pease wrote:
> Working with an Observable object, I wanted to be able to add a Proc
> as an observer. Observable requires all observers to implement an
> update method. When the Observable state changes, this is the method
> that will be called to notify observers of the state change.

Interesting... I'd like to see a simple example of this.

> My generic solution was to create a module that adds an update method
> for Proc objects.
>
> module ProcAsObserver
>   def update( *args )
>     self.call *args
>   end
> end
>
> To use this module ...
>
> method = lambda {|*args| args.each {|x| puts x}}
> method.extend ProcAsObserver
>
> my_observable_object.add_observer(method)
>
> That's it!  Just a handy little tip for anyone working with Observable objects.

Given your approach I think I'd just go ahead and do:

  class Proc
    alias :update :call
  end

T.