I'm just starting to wrap my head around the "matlab.mixin.Heterogeneous" class. I understand why methods must be declared "Sealed" in order for me to call them on heterogeneous arrays, e.g. a base class with something like:
dbtype Base
classdef Base < matlab.mixin.Heterogeneous
methods (Sealed)
function tf = isValid(this)
...
end
end
end
allows me to create a heterogeneous array of two subclasses Sub1 and Sub2 and then call the isValid method on the array:
array = [Sub1(1) Sub2(NaN)];
isValid(array)
ans =
0 1
However, I don't see why I shouldn't be able to inherit functionality from further up the chain. Imagine I factor some of Base's functionality out into a parent class, Parent, giving me the class hierarchy:
matlab.mixin.Heterogeneous
|
Parent
|
Base
/ \
Sub1 Sub2
and Base now looks something like this:
dbtype
classdef Base < Parent
methods (Sealed)
function tf = isValid(this)
tf = isValid@Parent(this);
...
end
end
end
Base's isValid method is still Sealed, but it inherits some useful functionality from Parent's version of isValid. When my array is not heterogeneous, e.g.
array = [Sub1(1) Sub1(NaN)]
isValid(array)
ans =
1 0
then isValid works as expected. However, when I create a Heterogeneous array, MATLAB throws an exception:
array = [Sub1(1) Sub2(NaN)]
isValid(array)
Cannot call method 'isValid' because 'this' is heterogeneous and 'isValid' is not sealed. For more details please see the method dispatching rules for heterogeneous arrays.
The doc on method dispatching seems to say that I should be able to do what I'm trying to do ("The method Must be defined for the class of the heterogeneous array, either directly by the class of the array or inherited from a superclass."). Also, it seems obvious to me that this should work, since my heterogeneous array is now of type Base and Base inherits from Parent.
Could someone please help me either (1) figure out what I've got wrong, or (2) confirm that this should work but doesn't so I can put it in as a feature request? Thanks!
