From: "David A. Black" <dblack@...>
Date: 2005-10-06T04:51:24+09:00
Subject: Re: Module#const_missing redefinition

Hi --

On Thu, 6 Oct 2005, El Barto wrote:

> I try to redefine #const_missing but it does not behave as I expect.
>
> def Object.const_missing(sym)
>  puts "%s.const_missing: %s" % [self, sym]
> end
>
> class Test
>  def Test.const_missing(sym)
>    puts "%s.const_missing: %s" % [self, sym]
>  end
>
>  # OK: Test.const_missing
>  Bart
> end
>
> Test.new.instance_eval do
>  # Object.const_missing, why not Test.const_missing?
>  Bart
> end
>
> Test.module_eval do
>  # Object.const_missing, why not Test.const_missing?
>  Bart
> end

I believe it's because of the pseudo-static way in which constants are
resolved.  Spotted at parse-time, Bart is assumed to be a constant of
Object.  If you change the first one to self.class::Bart, and the
second one to self::Bart, they will be resolved as Test::Bart.


David

-- 
David A. Black
dblack@wobblini.net