class inheritance

[David Bateman]

There is one final feature of the OOP classes that I see is missing in 
Octave. That is class inheritance. For example

@uppertri/uppertri.m

might be a constructor for an upper matrix class and it should inherit 
from the "double" class and so I'd expect the class to class in the 
contructor to look like

a = class (a, "uppertri", b)

where b is of class "double" and contains the matrix. Should we 
implement this? Frankly, I'm not sure of the complexity involved in such 
an implementation.

D.

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