From: elbows@... (Nathan Weston)
Date: 2003-12-06T04:12:03+09:00
Subject: Re: Using Modules as Decorators

nobu.nokada@softhome.net wrote in message news:<200312040501.hB451XUm013568@sharui.nakada.kanuma.tochigi.jp>...
> Hi,
> 
> At Thu, 4 Dec 2003 07:17:07 +0900,
> Nathan Weston wrote:
> >       def decorate(obj, name)
> >         #We have to eval string to avoid scope issues:
> >         #class << obj
> >         #  alias_method(:orig_name(name), :name)  <-- These variables
> >         #                    are substituted through string expansion
> >         #end 
> >         eval("class << obj\nalias_method(:#{orig_name(name)}, :#{name})\nend")
> >       end
>         def decorate(obj, name)
>           orig = orig_name(name)
>           (class << obj; self; end).class_eval {alias_method(orig, name)}
>         end

Cool! I was wondering if there was a syntax for that, but I couldn't
figure it out so I just gave up and used eval.

> 
> >       #Call the original definition of name on object
> >       def call_orig(obj, name, *args)
> > 	obj.send(orig_name(name), *args)
> >       end
>         def call_orig(obj, name, *args, &block)
>           obj.__send__(orig_name(name), *args, &block)
>         end

What does __send__ do? And what's the block for?

Nathan