From: Leon Bogaert <leon@...>
Date: 2008-05-11T21:33:54+09:00
Subject: Re: Sharing variables between classes and instances

David A. Black wrote:
> Hi --
> 
> On Sun, 11 May 2008, Leon Bogaert wrote:
> 
>> Hi all,
>>
>> What I'm trying to achieve: add a variable to a class. Fill it with
>> data. Every nstance of that class should have access to the data in that
>> variable. But I want every instance be able to modify that variable,
>> without modifying the original value of the variable.
> 
> I'm not sure what you mean exactly. Do you mean each instance should
> have a copy of the object? If so, I would just do:
> 
> class Tester
> 
>    def self.vars
>      @vars ||= []
>    end
> 
>    def self.add_var(var)
>      self.vars << var
>    end
> 
>    def vars
>      @vars || self.class.vars
>    end
> 
>    def add_var(var)
>      @vars ||= self.class.vars.dup
>      vars << var
>    end
> end
> 
> That gives the results you expect in your test.
> 
> 
> David

Thanks David. That's a whole lot simpler. I think I'll stick with your 
example.
Except I think I'll merge @vars & self.class.vars each time vars() gets 
called. So you can update the original Tester class with new vars and 
that the instances have access to these new vars too.

Thanks!
-- 
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