From: Gary Wright <gwtmp01@...>
Date: 2007-03-30T15:12:47+09:00
Subject: Re: class methods and instance variables in ActiveRecord::Base


On Mar 30, 2007, at 1:20 AM, zig wrote:

> On Mar 25, 11:42 am, "zig" <ziggur...@gmail.com> wrote:
>>  Therefore class instance
>> variables are not the same thing as class variables.
>>
>
> One thing we _can_ say is that class instance *methods* are the same
> thing as class methods, right?  In fact, the term "class instance
> method" doesn't exist as a distinct concept, precisely because they
> are the same.

I'm not sure that 'class instance methods' is a well-defined term.

I think what you are after is
   instance methods of a singleton class of a class
are the same as
   singleton methods of a class
are the same as
   class singleton methods
are the same as
   class methods

Via irb:

 >> Array.singleton_methods
=> ["[]"]
 >> Regexp.singleton_methods
=> ["escape", "quote", "last_match", "compile", "union"]
 >> Time.singleton_methods
=> ["rfc822", "gm", "zone_offset", "parse", "iso8601", "rfc2822",  
"utc", "xmlschema", "today", "at", "mktime", "now", "_load",  
"httpdate", "local", "times"]

But 'Class instance methods' is well-defined:

 >> Class.instance_methods(false)
=> ["new", "superclass", "allocate"]