[Octave-bug-tracker] [bug #62077] classdef: cannot fully recover cleared object variable

[Kai Torben Ohlhus]

URL:
  <https://savannah.gnu.org/bugs/?62077>

                 Summary: classdef: cannot fully recover cleared object
variable
                 Project: GNU Octave
            Submitted by: siko1056
            Submitted on: Fri 18 Feb 2022 06:55:44 PM JST
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: Any

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Details:

Given the class


classdef bad_class
  methods (Access = 'private')
    function foo1(obj)
      disp ('call foo1');
    end
    function foo2(obj)
      disp ('call foo2');
      clear all;
      obj = evalin ('caller', 'obj');
      disp ('     clear all');
      obj.foo1 ();
    end
  end
  methods
    function foo3(obj)
      obj.foo2();
    end
  end
end


In member function `foo2` the command `clear all` clears all variables in the
current scope.  This is conform with Matlab R2021a.

In Matlab one can recover the lost variable as described in `foo2`.  In Octave
6.4.0, 7, and 8 the output is:


call foo2
     clear all
error: subsref: method 'foo1' has private access and cannot be run in this
context
error: called from
    foo2 at line 11 column 7
    foo3 at line 16 column 7


A workaround is declaring everything as "public".  Same problem with
"protected"

Similar to bug #56953.  




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