From: ts <decoux@...>
Date: 2001-12-16T20:31:53+09:00
Subject: [ruby-talk:28669] Re: assigning to class variable works in string,  not in block

>>>>> "J" == Joel VanderWerf <vjoel@PATH.Berkeley.EDU> writes:

J> Was the problem that @@base_class was not getting bound to the class
J> variable of BaseClass, because it was referenced in a block whose scope
J> was module M?

 For class variable (like for constant) you have 2 steps : declaration and
 assignement. Because @@base_class was seen in a singleton method, ruby
 think that it's an assignement. It's error message was to say that it
 can't find a *pre-declared* class variable @@base_class.

 With "class << self; def xxx() end; end", the class variable is seen in a
 method and for ruby it's a declaration. In this case the variable is
 created if it don't exist.

Guy Decoux