From: Christoph Neubauer <christoph.neubauer@...>
Date: 2004-09-17T17:09:46+09:00
Subject: Re: class variable weirdness

"Bob Sidebotham" <bob@windsong.bc.ca> wrote in message
news:F7v2d.432470$M95.325276@pd7tw1no...
>
> But if I remove the commented line, above, then I get:
>
>    uninitialized class variable @@var in Mod (NameError)
>
> This is with ruby 1.8.2 (2004-09-10) [i686-linux]
>
> Is this a bug, feature, or am I just missing something?
>
> Thanks,
> Bob Sidebotham
>


Hi Bob !

It's the same behaviour on ruby 1.6.8 (2002-12-24) [i586-mswin32]

"Programming Ruby, HTML Help edition (v0.3a)" says about Class Variables:

>> Unlike global and instance variables, class variables must be initialized
before they are used.
Often this initialization is just a simple assignment in the body of the
class definition. <<

As I understand Ruby and compiling/parsing techniques the error message
says,
that @@var is not initialized --> within the scope of Mod.

As Mod could be included 'anywhere and anyhow' it's the one and only scope
where it is possible in common  to check/grant variable initialization.

Kind Regards,
Chris