From: nobu.nokada@...
Date: 2002-10-12T01:26:44+09:00
Subject: Re: Different Behavior of Class Variables w.r.t ||=

Hi,

At Sat, 12 Oct 2002 00:57:04 +0900,
Kent Dahl wrote:
> > > Yes, if the class var is already initialized.  However (1.6.7):
> > 
> > >   candle:~$ ruby -ve 'a ||= 3; @a ||= 3; @@a ||= 3'
> > >   ruby 1.6.7 (2002-03-01) [i686-linux]
> > 
> > This is very interesting.  Should Ruby be more consistent in this respect?
> 
> That might be a bad idea, since class variables are more "magical" than
> both instance variables and local variables.
> 
> The inheritance hierarchy level where the class variable is first
> defined decides where it is visible. This is not a problem with local
> variables nor instance variables. Although it is alot more verbose,
> using the "@@a = 1 unless defined? @@a" trick gives you the same
> functionality, but is easier to spot while reading, if it causes a bug.

Oops, 1.7 behavior has changed.  Bad idea?
# [ruby-talk:50421] & [ruby-dev:18278]

-- 
Nobu Nakada