Hi all,
Sorry if the post's title is confusing... I'll explain:
I have a class, called A say, and N>1 subclasses of A, called
A1, A2, A3, ..., AN say.
Instances of each subclass can sensibly be joined together with other
instances of the *same subclass*. The syntax of the join method is
identical for each of the N subclasses, so it would make sense to
implement a *single* method called join in the toplevel class A, and
then do:
a = A1()
b = A1()
a.join(b) #I want the join method to be inherited from class A
d = A2()
e = A2()
d.join(e)
But I want to raise an exception if my code finds:
f = A1()
g = A2()
f.join(g) #should raise exception, as cannot join an
#instance of A1 to an instance of A2.
How can I verify in a method defined in class A that the subclasses I
am joining are exactly the same? Or is there a design flaw here I
haven't spotted that makes this a bad idea? Or do I need to code N
join methods?
Many thanks,
Andy
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