From: Rick DeNatale <rick.denatale@...>
Date: 2007-12-29T05:21:39+09:00
Subject: Re: Matz says namespaces are too hard to implement - why?

On Dec 28, 2007 1:28 PM, Paul Brannan <pbrannan@atdesk.com> wrote:
> On Sat, Dec 29, 2007 at 12:54:28AM +0900, Rick DeNatale wrote:
> > > > def divide(a, b)
> > > >    use namespace Mathn
> > > >    a / b
> > > >  end
> > > >
> > > > Now, I'd think you would want:
> > > >
> > > > 1 / 2 #=> 1
> > > >
> > > > divide(1,2) #=> 1 / 2
> ...
> > What causes the integer 1 to use the '/' method monkeypatched in Mathn
> > in one case and not the other?
>
> In the first case (1 / 2), the Mathn namespace is not active, so the
> usual integer division method applies.
>
> In the second case (divide), the Mathn namespace is active, so Integer#/
> defined in the Mathn namespace applies.

Okay, I read your pastie again, and I understand the unnatural acts
being performed a bit more.  All I can say is that it makes me want to
run away in horror.

There are also some other little issues, for example, the way mathn
changes Fixnum and Bignum

class Fixnum
  alias / quo
end

class Bignum
  alias / quo
end

and in Ruby 1.9 these become:

class Fixnum
  remove_method :/
  alias / quo
end

class Bignum
  remove_method :/
  alias / quo
end




-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/