On 4/28/2011 3:35 PM, Carl Banks wrote:
On Thursday, April 28, 2011 10:15:02 AM UTC-7, Ethan Furman wrote:
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!
That's not what we mean by composition. Composition is when one
object calls upon another object that it owns to implement some of
its behavior. Often used to model a part/whole relationship, hence
the name.
The distinction isn't that strong in Python, where an object
can't be part of another object. Object fields are references, not
the objects themselves.
In C++, you really can have an object as a field of an enclosing
object. The inner object's destructor will be called first.
Destructors and ownership tend not to be too important in Python,
because storage management is automatic.
John Nagle
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