[Octave-bug-tracker] [bug #42735] subclass inheritence: symbol ops (e.g., plus, mtimes) do not respect superiorto

[Colin Macdonald]

URL:
  <http://savannah.gnu.org/bugs/?42735>

                 Summary: subclass inheritence: symbol ops (e.g., plus,
mtimes) do not respect superiorto
                 Project: GNU Octave
            Submitted by: cbm
            Submitted on: Fri 11 Jul 2014 11:08:52 PM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

I have a class called parent and a class called child.

Say P is instance of parent and C is instance of child.

parent and child have "myplus" and "plus" methods.

1)  P+C and C+P call different plus methods, independent of whether
superiotor('parent') is set.  This behaviour DOES NOT match matlab.

2)  plus(P,C) and plus(C,P) call the child plus method if superiorto is set,
otherwise different methods.  This behaviour matches matlab 2008a.

3)  myplus(P,C) and myplus(C,P) call the child myplus method if superiorto is
set, otherwise different methods.  This behaviour matches matlab 2008a.

Tested with plus, minus, mtimes.  Tested on 3.8.1 and "hg - 1 month".

(personally, I don't see why I'd ever want the behaviour w/o superiorto, but
that is not the bug here)

I'll attach my minimal example: untar and run mytest.m



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File Attachments:


-------------------------------------------------------
Date: Fri 11 Jul 2014 11:08:52 PM GMT  Name: inheritance.tar  Size: 20kB   By:
cbm

<http://savannah.gnu.org/bugs/download.php?file_id=31704>

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