Re: Object-relational impedence
Date: Thu, 13 Mar 2008 12:02:23 -0500
Message-ID: <2008031312022329267-unclebob_at_objectmentorcom>
On 2008-03-12 04:21:53 -0500, JOG <jog_at_cs.nott.ac.uk> said:
> What I am questioning whether we
> need the concept of inheritance /whatsoever/.
Is inheritance necessary? Certainly not. Is it useful? Certainly.
> It does not exist in
> logic, it has no underlying theoretical justification, and is purely
> an ad hoc mechanism thrown together at xerox parc.
I think it was "thrown together" in Norway by Dahl and Nygaard. I could be wrong. But so what? It's a useful tool.
> Is it not true that
> inheritance has lost favour over the years -
Overuse, yes. Not use.
> composition is generally preferred,
Generally, yes.
> unless one is defining interfaces (and whether that should
> still be called "inheritance" is open to debate).
Inheritance is the redeclaration of functions and variables within a subscope. That fits rather well with the abstract methods of an interface.
-- Robert C. Martin (Uncle Bob) | email: unclebob_at_objectmentor.com Object Mentor Inc. | blog: www.butunclebob.com The Agile Transition Experts | web: www.objectmentor.com 800-338-6716 |Received on Thu Mar 13 2008 - 18:02:23 CET