Re: Difference between inheritance and package use

[milt@lax.pe-nelson.com (Milt Ratcliff)]

>]>   A tractor does not share much interface with a wheel or an engine.
>]>Describing a tractor as inheriting from Wheel and Engine, would be
>]>stupid.

>Agreed, stupid it would be. It would also, by the way, be
>a great example of multiple inheritance. ;-)

Perhaps, but it would be a very BAD example of multiple inheritance since
a tractor is NEITHER a wheel nor an engine.  A tractor which uses a wheel
or engine would actually be a form of composition.

If the tractor inherits from some 'vehicle' object of which it is a true
specialization the inheritance would be more correct.

I have rarely seen inheritance used without the posibility of also using
composition to provide part of the specialization.

Milt
-- 
Milt Ratcliff                                            milt@pe-nelson.com
PE-Nelson                                                +1.408.725.1107
10040 Bubb Road
Cupertino, CA  95014
-- 
Milt Ratcliff                                            milt@pe-nelson.com
PE-Nelson                                                +1.408.725.1107
10040 Bubb Road
Cupertino, CA  95014