From: nobu.nokada@...
Date: 2003-12-06T09:11:15+09:00
Subject: Re: Using Modules as Decorators

Hi,

At Sat, 6 Dec 2003 04:12:03 +0900,
Nathan Weston wrote:
> >         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.

This construct sometimes appears here.

> >         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?

#send may be overridden, e.g. Socket, however, redefinition of
__send__ is warned.

  $ ruby -e 'class Foo;def __send__;end;end'
  -e:1: warning: redefining `__send__' may cause serious problem

When the original method yields, you have to pass the given
block.

-- 
Nobu Nakada