How to assign obeject properties to another object

Hi, I have a superClass as follows:

classdef superClass < handle
    properties
        a = 0; 
        b = []
    end
    
    methods
        function obj = superClass(varargin)
            if (nargin>0)
                p = inputParser;
                p.addParameter('a', 0, @isnumeric);
                p.addParameter('b', 0, @isnumeric);
                
                p.parse(varargin{:});
                obj.a  = p.Results.a;
                obj.b  = p.Results.b;
                
            end
        end
    end
end    

which gives:

>> obj1=superClass('a',3,'b',5)

obj1 = 

  superClass with properties:

    a: 3
    b: 5
    

How do I create another object obj2 using a subclass such that

obj2 = subclass(obj1, 'c' , 7)
obj2 = 

  subClass with properties:

    a: 3
    b: 5
    c: 7

Thank you, in advance.

[per isakson]

The names SuperClass and SubClass make me think about inheritance. However, the signature subclass(obj1,'c',7) make me think about composition. See Composition over inheritance.

The output

obj2 = 
  subClass with properties:
    a: 3
    b: 5
    c: 7

speaks for inheritance.

Or are you intending something else?

Answer 1

[Matt J]

As long as the properties are not Dependent, you can use the attached routine to assist with the property-copying in the subclass constructor,

classdef subclass < superclass
        methods
           function obj=subclass(obj1,varargin)
         
                 obj=copyprops(obj1,obj);
        
                     if (nargin>1)
                        p = inputParser;
                        p.addParameter('c', 0, @isnumeric);
                        
                        p.parse(varargin{:});
        
                        obj=copyprops(p,obj);
                        
                    end
            end
        end
end