From: ts <decoux@...>
Date: 2002-05-11T20:56:09+09:00
Subject: Re: Class variable weirdness

>>>>> "C" == Cristian Szegedy <szegedy@t-online.de> writes:

C> My Ruby is:

C> ruby 1.6.7 (2002-03-01) [i686-linux]

 Well, there is a bug in your version of linux :-)))

pigeon% cat b.rb
#!/usr/bin/ruby -v
class A
   @@x = 1
   def A.f
     puts @@x
     @@x = 2
     puts @@x
   end
end

class << A
   def g
     puts @@x
     @@x = 3
     puts @@x
   end
end

A.f
A.g
pigeon% 

pigeon% b.rb
ruby 1.6.7 (2002-03-01) [i686-linux]
ruby 1.6.7 (2002-03-01) [i686-linux]
1
2
2
3
pigeon% 

 Now be carefull with this because this is modified with 1.7.x

pigeon% ./ruby -v ~/b.rb
ruby 1.7.2 (2002-05-10) [i686-linux]
1
2
/home/ts/b.rb:13: warning: class variable access from toplevel singleton method
/home/ts/b.rb:13:in `g': uninitialized class variable @@x in Object (NameError)
        from /home/ts/b.rb:20
pigeon% 


Guy Decoux