Program to an interface, not an implementation
egbert at bork.demon.nl
Fri Jun 7 10:48:22 CEST 2002
All your comments are crystal clear. Thanks.
My next problem is on nearly the same page (17) of the GoF book:
class versus interface (== type) inheritance, but in the python context.
"In C++ and Eiffel inheritance means both interface and implementation
"in Smalltalk inheritance means just implementation inheritance".
I don't know any of these languages.
Now in my simplistic worldview, if you inherit from a class,
you inherit everything, implementation and interface,
because the implementation defines the interface as well.
Even if all methods of the superclass only contain 'pass'.
But I may be wrong.
Egbert Bouwman - Keizersgracht 197 II - 1016 DS Amsterdam - 020 6257991
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