[Octave-bug-tracker] [bug #55810] sizeof() returns 0 for classdef objects

[Mike Miller]

Update of bug #55810 (project octave):

                Severity:              3 - Normal => 2 - Minor              
                Priority:              5 - Normal => 3 - Low                

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Follow-up Comment #6:

Since 'sizeof' is not a defined Matlab function or object method, it's
intentionally not used as an override when getting the size of objects in
'whos'.

I tested with 'containers.Map' in the Matlab online feature, and the size of
the map object is 8 bytes, regardless of how many entries are added to the
map.

I found this:
https://www.mathworks.com/matlabcentral/answers/14837-how-to-get-size-of-an-object

Where a Mathworks employee wrote

> Unfortunately, there is no way to check the amount of memory that is being
> occupied by class objects, since MATLAB is storing references to C++
> objects. As you say, whos is representing the size of the pointer to the
> created object, which will be 60 bytes (in 32-bit) or 112 bytes (in
64-bit).
> 
> However, you can create a function in your class and calculate the real
> memory of the object by manually querying for the memory of each of the
> properties in the class, like you do with whos for a matrix.

So I think we can choose to return whatever we want to for 'whos' and 'sizeof'
on class objects, since there is no compatibility problem here.

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