MATLAB - create reference (handle?) to variable

Question

Suppose I have the following class:

classdef myClass < handle
    properties
        A = 1
    end
    methods
        function obj = myClass(val)
                   


        

Answer 1

You could do this by with a PropertyReference class

classdef PropertyReference < handle
    %PropertyReference Reference to a property in another object    
    properties
        sourceHandle
        sourceFieldName
    end

    properties (Dependent = true)
         Value
    end

    methods                
        function obj = PropertyReference (source, fieldName)            
            obj.sourceHandle = source;
            obj.sourceFieldName = fieldName
        end
        function value = get.Value( obj )
            value = obj.sourceHandle.(obj.sourceFieldName);
        end

        function set.Value( obj, value )
            obj.sourceHandle.(obj.sourceFieldName) = value;
        end
        function disp( obj )
            disp(obj.Value);
        end
    end              
end

Continuing your example, you could then use PropertyReference as follows:

q = myClass(10);
>> q.A = 15;
>> ref = PropertyReference(q,'A');
>> disp(ref)
   15
>> q.A = 42;
>> disp(ref)
   42

Usage of the PropertyReference class is a bit awkward but the original class remains unchanged.

EDIT - Added disp function overload as per strictlyrude27 comment