From: "David A. Black" <dblack@...>
Date: 2007-02-26T06:51:36+09:00
Subject: Re: Any way to undef a constant?

Hi --

On 2/25/07, Bill Kelly <billk@cts.com> wrote:
> From: "Patrick Hurley" <phurley@gmail.com>
> > On 2/23/07, Bill Kelly <billk@cts.com> wrote:
> >> Auuugh!!! How did I miss that !!!!!!!!!!!!!!!!!!!!!!!  :D
> >
> > You are not the first, I think it is the naming convention. We have
> > constants, const_get, const_set and remove_const (reversed naming).
>
> In my case it was "undef" vs. "remove".  I was used to
> undef_method.  So I did `ri undef`, and got:
>
>   Module#method_undefined, Module#undef_method,
>   Object#singleton_method_undefined, ObjectSpace#undefine_finalizer
>
> So there appeared to be no undef_constant.  However, once you pointed
> me to remove_const, I can see we have a much richer set of remove_
> methods, only about half of which have undef_ aliases.
>
>   Module#method_removed              Module#method_undefined
>   Module#remove_class_variable
>   Module#remove_const
>   Module#remove_method               Module#undef_method
>   Object#remove_instance_variable
>   Object#singleton_method_removed    Object#singleton_method_undefined
>   ObjectSpace#remove_finalizer       ObjectSpace#undefine_finalizer
>
>
> From my point of view, it would be nice to add the three
> missing _undef aliases.  (Is that worthy of an RCR ?)

They're not aliases, though. See ri undef_method for illustration of
the difference between undef_method and remove_method.


David

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