On 18.01.2009 14:07, Zhao Yi wrote:
> David A. Black wrote:
>> It's a class variable, which is actually a class-hierarchy variable
>> (shared between a class and its descendants), and also visible to all
>> the instances of all of those classes.
>>
>> In other words, it's a kind of class-hierarchy-scoped global. Think of
>> it as $$name :-)

> Ok thanks. That's why I always got error when access to this variable 
> outside of the class-hierarchy.

Actually I would recommend against using this beast.  There are some 
subtle issues with regard to definition order.  Better use an instance 
variable of the class instance.

Kind regards

	robert

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