Cannot get rid of "Warning: The class file for 'XXX' has been changed; but the change cannot be applied because objects based on the old class file still exist"

Hi all,

I tried to do 'clear', 'clear all', 'clear classes' etc (as suggested in the warning message itself!). I even embedded my test-code in a try catch:

try
    test_code
catch ME
    show_error(ME)
    clear classes
    clear all
end

as an attempt to clear data before leaving my test-function, but nothing helps. It now turns out that I have to restart MATLAB (R2012a) every time an error occurs in one of my classes in order to continue developing. Extremely annoying... Hopefully somebody has a remedy for this...

Best regards,

Jeroen

Answer 1

[Tushar Sinha]

Hi Jeroen,

You might be facing this issue as there might be an intermediate instance being created which is not being destroyed. To resolve this issue, make use of a destructor and then delete the object yourself instead of leaving the it to clear function to destroy it.

methods
   function delete(obj)
      % obj is always scalar
   ...
   end
end

You can destroy handle objects by explicitly calling delete on the object:

delete(obj)

Refer to the link below for more information on Handle Class Destructor: http://www.mathworks.com/help/matlab/matlab_oop/handle-class-destructors.html

Another way to handle this would be to use "clear classes" multiple times in your code

I hope this helps!

Thanks,

Tushar