From: dblack@...
Date: 2007-07-23T22:49:01+09:00
Subject: Re: How do you "undef_method" for a class method?

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Hi --

On Mon, 23 Jul 2007, Dean Wampler wrote:

> On 7/22/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
>>=20
>> Hi --
>>=20
>> On Mon, 23 Jul 2007, Xavier Noria wrote:
>>=20
>> > El Jul 22, 2007, a las 6:44 PM, Dean Wampler escribi=F3:
>> >
>> >> Module#undef_method and Module#remove_method work fine for instance
>> >> methods,
>> >> but if you specify a class method, your get an error that it doesn't
>> exist.
>> >> (I'm using ruby 1.8.6.)
>> >
>> > You need to get into the singleton class:
>> >
>> > (class << Foo; self; end).send(:remove_method, :method)
>>=20
>> You're doing too much work :-)  See Robert D.'s answer:
>>
>>    class << Foo
>>      remove_method :method
>>    end
>>=20
>> Once you're in the class definition body, you can just go ahead and do
>> things; you don't have to grab the class and address it
>> programmatically unless there's a specific reason.
>
>
>
> That did it. Thanks. It didn't occur to me to open the singleton class on=
 a
> class itself, as opposed to opening the singleton class for an object. I
> assume that both are called singleton classes (?).

By me they are :-)  Sometimes you'll hear the singleton class of a
Class object referred to as a metaclass.  Then again, sometimes you'll
hear singleton classes in general referred to as metaclasses.  I'm
happy with "singleton class", but we're all waiting for a
pronouncement from Matz :-)


David

--=20
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