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[Octave-bug-tracker] [bug #54800] Class method invocation errors

From: Amro
Subject: [Octave-bug-tracker] [bug #54800] Class method invocation errors
Date: Sun, 7 Oct 2018 07:07:36 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0


                 Summary: Class method invocation errors
                 Project: GNU Octave
            Submitted by: amro_octave
            Submitted on: Sun 07 Oct 2018 02:07:34 PM EEST
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: Any



I recently upgraded to Octave 4.4.1, and I noticed unexpected errors when
invoking a classdef object method.

Take this simple class definition (constructor, destructor, and a method):

classdef MyClass < handle
    function this = MyClass()
      disp('-- MyClass.MyClass')

    function delete(this)
      disp('-- MyClass.delete')

    function x = func(this)
      disp('-- MyClass.func')
      x = 1;

All the following should work for calling the class method:

obj = MyClass();
x = obj.func()
clear obj

obj = MyClass();
x = func(obj)
clear obj

x = MyClass().func()

x = func(MyClass())

But the last two are failing with:
"error: value on right hand side of assignment is undefined"

Interestingly, if I remove the destructor from the class (i.e "delete"
function), the last two invocations work again.

In comparison, all the above cases work as expected in MATLAB (dot notation
vs. function notation call, as well as using a temporary variable to store the
object vs. not)


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