[Octave-bug-tracker] [bug #38261] fdisp not called for objects stored in structs or cell arrays

[John W. Eaton]

URL:
  <http://savannah.gnu.org/bugs/?38261>

                 Summary: fdisp not called for objects stored in structs or
cell arrays
                 Project: GNU Octave
            Submitted by: jwe
            Submitted on: Tue 05 Feb 2013 04:20:24 AM GMT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: jwe
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Given the following simple (old-style) class definition and overloaded
methods:


% @foo/foo.m:
function obj = foo ()
  obj = class (struct ('x', 13), 'foo');
end

% @foo/display.m:
function display (obj)
  disp (obj.x);
end

% @foo/fdisp.m:
function fdisp (fid, obj)
  fdisp (fid, obj.x);
end


(For ease of duplicating the problem, a tar file with these functions is
attached).

fdisp is not called as one might expect when an object of class foo is stored
in a struct or cell array:


octave:1> obj = foo
 13
octave:2> fid = fopen ('foo.out', 'w');
octave:3> fdisp (fid, {obj})
   13
octave:4> fdisp (fid, struct ('x', obj));
octave:5> fclose (fid);


This bug is why we are currently seeing output from the tests that were
recently added for concatenation of class objects with built-in types.

Further, I suspect that display and disp are not called by the interpreter as
described in the Matlab documentation.




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File Attachments:


-------------------------------------------------------
Date: Tue 05 Feb 2013 04:20:24 AM GMT  Name: @foo.tar  Size: 10kB   By: jwe

<http://savannah.gnu.org/bugs/download.php?file_id=27390>

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