Am 25.05.2012 23:41, schrieb [email protected]:
If you do that, you won't have any simple way of recognising
ScalarFields, or things-like-rect.d_dx (what do you call them?), which
seems rather inconvenient. Worse than that, objects like (rect.x *
rect.d_dx) cannot possibly work satisfactorily.
Why would I want to recognize them? It is all about interface, not
what class they are.
I guess it depends on whether you're talking about a class that defines
an interface, or a class that was written to serve some other purpose.
(Putting an interface definition into a class is usually good design.)
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