I didn't thinks so, but was not sure. I have not done much with Abstract classes. I will have to think about that and its design implications. Thanks for the suggestion. Jimmie On 12/22/20 8:01 PM, Richard Sargent wrote:

Is there a way force allSubclasses to implement the method?

No. Pretty much, you need to avoid subclassing concrete classes. i.e. if A has subclasses B and C, refactor to create an abstract A' and move A to be a leaf subclass of A'.

-----Original Message----- From: Jimmie Houchin [mailto:jlhouchin@gmail.com] Sent: December 22, 2020 15:08 To: Any question about pharo is welcome Subject: [Pharo-users] subclassResponsibility

Hello,

I have created a class which will have many subclasses some of which will have subclasses of their own.

I want every single class to implement a class method #shortName which will provide a short string as a human readable short identifier to the object.

I have in the highest superClass

shortName

    self subclassResponsibility

But the moment I implement it in a subclass which has subclasses. Those subclasses are now using their closest superClasses implementation.

Is there a way force allSubclasses to implement the method?

Thanks.

Jimmie