At Thursday 21/9/2006 07:34, LorcanM wrote:
I think there's a basic misunderstanding about the nature of
inheritance on my side.
What I want to do is instantiate the sub class (derived class) from
within the animal class. I then expect the sub class to have inherited
some basic properties that it knows it has (weight, colour). If I can
expand the example I gave previously to try to make this a little
clearer:
As an analogy: a certain animal, a given individual, is of a kind
"from birth". You don't have an abstract, unshaped, animal, that by
some kind of magic later becomes a bird, or a mammal...
When you construct an object instance, it is of a certain type from
that precise moment, and you can't change that afterwards.
So, you construct a bird, which is a kind of animal (class
inheritance is the way of modelling that "is a kind of" relationship).
Hope it becomes clearer now.
Gabriel Genellina
Softlab SRL
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