Composition instead of inheritance

[Ethan Furman]

For anybody interested in composition instead of multiple inheritance, I
have posted this recipe on ActiveState (for python 2.6/7, not 3.x):

http://code.activestate.com/recipes/577658-composition-of-classes-instead-of-multiple-inherit/

Comments welcome!

~Ethan~

 

[Dan Stromberg]

That's not what we mean by composition.  Composition is when one objectcalls upon another object that it owns to implement some of its behavior.  Often used to model a part/whole relationship, hence the name.

It's a pretty old idea, that seems to be getting revived in a big way
all of a sudden. Perhaps the Java people just rediscovered it?

In a Software Engineering class using Ada, the teacher called it
"Structural Inclusion", and of course it was an important concept in
Ada, because Ada had no inheritance. This was in 1989-1990.

 

[Alan Meyer]

For anybody interested in composition instead of multiple inheritance, I
have posted this recipe on ActiveState (for python 2.6/7, not 3.x):

http://code.activestate.com/recipes/577658-composition-of-classes-instead-of-multiple-inherit/


Comments welcome!

~Ethan~

That looks pretty clever. I tried adding this method to Spam:

def test_eggs_02(self):
print('testing eggs_02 from spam')

and it did just what we wanted.

I'm going to have to study this one.

Thanks.

Alan