Inheritance but only partly?

[Simon Brunning]

2008/10/3 Tim Rowe <digitig at gmail.com>:

> As others have said, no. What nobody seems to have said yet is why. If
> Y descends from X, you are saying that Y is an X; that a Y can be used
> anywhere an X can. If Y doesn't support some methods of X then it is
> *not* an X, and *can't* be used anywhere an X can.

See <http://en.wikipedia.org/wiki/Liskov_substitution_principle>.

-- 
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Simon B.
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