How to override inherited methods?

classdef superClass < matlab.mixin.SetGet  % SuperClass
    properties
        prop1 = [];
        prop2 = [];
    end
    methods
        function obj = superClass( )
            obj.set( 'prop1', 'Hello!' );
            obj.set( 'prop2', 'My name is' );
        end
        function set.prop1( self, value ) % Method that I want to override.
            self.prop1 = value;
        end
        function set.prop2( self, value ) % I don't want to override all of them.
            self.prop2 = value;
        end
    end
end
classdef subClass < superClass
    properties
        prop3 = [];
    end
    methods
        function obj = subClass( )
            obj.set( 'prop1', 'Hello' );
            obj.set( 'prop2', 'My name is' );
            obj.set( 'prop3', 'Dom.' );
        end
        function set.prop1( self, value ) % Override here, somehow...
            value = strcat( value, ', World!' )
            self.prop1 = value;
        end
        function set.prop3( self, value )
            self.prop3 = value
        end
    end
end

Is there a way to override set.prop1() in 'subClass'? Do I need to change the methods attributes of the superClass set method, or the property attributes in 'subClass'/'superClass'? Here is the error when I try to define a subClass() instance:

----------------------------

"Error using subClass

Error: File: subClass.m Line: 1 Column: 10

Cannot specify a set function for property 'prop1' in class 'subClass', because that property is

not defined by that class."

----------------------------

If you create a 'prop1' property in 'subClass' and then again try to define an instance, then I get this error:

----------------------------

"Error using subClass

Cannot define property 'prop1' in class 'subClass' because the property has already been defined in the superclass

'superClass'."

----------------------------

Answer 1

[Steven Lord]

You can't do what you asked. If you could, you could relax the property setting validation to the point where your subClass instance wouldn't be a valid superClass instance.

You may be able to do what you want, however. Your superClass's property setter could call a normal instance method that subClass could overload. See the trustedSubclassSetterHelper methods in the attached superClass495080 and subClass495080. That helper doesn't actually set the property (otherwise you get into a loop) but merely provides the updated value. This means that the value would have to be something both superClass495080 (in set.prop1) and subClass495080 (in trustedSubclassSetterHelper) accept as a valid value.

>> Q = superClass495080

Q = 

  superClass495080 with properties:

    prop1: 'Hello!'
    prop2: 'My name is'

>> Q2 = subClass495080

Q2 = 

  subClass495080 with properties:

    prop3: 'Dom.'
    prop1: 'Hello World!'
    prop2: 'My name is'