Is there a callback to check if any of the objects properties are changed using OOP in MATLAB 7.6 ( R2008a)?

I am working with object oriented programming (OOP) in MATLAB 7.6 (R2008a).

I am looking for a function which is called a if any of the objects properties are changed using the dot operator. How can this be done in MATLAB?

Answer 1

[MathWorks Support Team]

There is no easy way to do this. However you can use the SUBSASGN function which is used for subscripted assignment for objects. An example is given below:

classdef foo < handle

      properties(SetObservable = true)

          val = 1;

      end

      methods

          function obj = subsasgn(obj, s, val)

              disp('hello');

              val = builtin('subsasgn', obj, s, val);

          end

      end

end

Now, at the MATLAB Command prompt, if you type:

f = foo;

f(1)

would give you the output:

 ans = 

 foo handle

 properties:

     val: 1

 lists of methods, events, superclasses

or typing

f.val

would give you the following output:

 ans =

      1