[Octave-bug-tracker] [bug #53911] default implementation of 'eq' for handle classes

[Richard]

Follow-up Comment #2, bug #53911 (project octave):

True, but I also need some way of uniquely identifying the instance, like
adding a random number property or something like this. I can probably come up
with something, but if there's some other method of uniquely identifying
objects that would be useful.

The default behaviour of isequal and == for handle classes is mentioned
briefly in this doc:

https://uk.mathworks.com/help/matlab/ref/handle.relationaloperators.html

A more comprehensive discussion is here:

https://uk.mathworks.com/help/matlab/matlab_oop/comparing-handle-and-value-classes.html

basically handle class has a default eq operator. == returns true if the
instances are the same, isequal returns true if the property values are the
same.

For value classes there is not a default eq operator, but isequal will return
true if the objects are of the same class and have the same property values.

There does seem to be a default ne operator for handle classes too:


>> y = x

y = 

  compare1 with properties:

    foo: 1.0000e+000

>> x ~= y

ans =

  logical

   0


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