James Foster a écrit :
> 
> On Nov 25, 2008, at 7:45 PM, Igor Stasenko wrote:
>> My understanding of inheritance is different, in short:
>> A subclass of particular class is a _specialization_ of base class,
>> not  _expansion_.
> 
> In this context, I sometimes wonder if Square should inherit from 
> Rectangle (a specialization in which width and height are equal), or 
> Rectangle should inherit from Square (adding an instance variable). Am I 
> right that you would have Square inherits from Rectangle (Square being 
> more specialized)? But then it feels like we are wasting an instance 
> variable (since Rectangle would have two).
> 
> James
> 
> 

Beware, you're dangerously sliping to multiple inheritance because your 
Square might also be a lozenge :)

Nicolas