From: "Christoph R." <chr_news@...>
Date: 2003-09-17T23:33:51+09:00
Subject: Re: Class variables, module inclusion and instance_eval

Christoph R. wrote:

.....
> This has to do with Ruby's scoping rules - here is an example I changed
> ``append_feature'' to the more modern ``included''

I maybe the following example is instructive too

---
module Nod
end

class A
    def Nod.included(aModule)
       # scope of @@bar is class A .. end
       aModule.module_eval do @@bar = aModule.name end
   end
end

class B
   include Nod
end

class A
   puts @@bar
end

# However

class B
   begin
    @@bar
   rescue => mes
     puts mes
   end
end
---

results in

---
B
uninitialized class variable @@bar in B
---


/Christoph