How do I handle BOTH MException and MSLException

I am very experienced with exceptions in C++ so the concept is nothing new to me. However. implementing it in the Mathworks world is. I have a handler function that I want to accept a generic exception object and inside the handler determine which exception ofject it is and act based on that determination. "isa" doesn't work since it returns a 1 regardless if I check it for MSLException or MException.

Bottom line, if I could figure out a way to determine if an exception object was either a MSLException or a MException then I can take it from there.

Any ideas?

Answer 1

[Virgil Bell]

I just figured out a workable solution.

"my_exception" is an exception object generated by my program.

 if (strcmp('MSLException',class(my_exception)))

     Temp_exception = MException(my_exception.identifier, my_exception.message);
     Temp_exception = addCause(Temp_exception, my_exception);

      % store exception info
      SAVE_MY_EXCEPION(Temp_exception); 
  else
      % it isn't so store my_exception info
      SAVE_MY_EXCEPION(my_exception); 
  end

Sure I sacrifice the MSLException handle information, but I get to store the exception information. I'd love to create storage for MSLException objects, but I don't see how to create that object. Creating it the same way as a MException doesn't work. a = MSLException('tempidentifier', 'tempmessage'); fails.

Answer 2

[Sean de Wolski]

MSLException inherits from MException so isa will return true for both. A regular MException is not necessary an MLSException, so test this:

kdlsjfajfe  % errors
ME = MException.last;
isa(ME,'MSLException')

[Virgil Bell]

Good idea but what if I throw a MException and then a MSLException? I need to handle based on the exception at hand and not based on what the previous exception was.

[Sean de Wolski]

That was just for me to create one for you.

In reality

try
% Whatever you're doing
catch ME
 if(isa(ME,'MSLException'))
   % it is
 else
   % it's a regular MException
 end
end