error using subsref and oop

[John W. Eaton]

On 27-Apr-2009, Bertrand Roessli wrote:

| I used the new oop feature in Octave that I am trying to 
| learn. 
| 
| For this function (found on the web) in the directory @date 
| 
| function [obj] = date(minute, hour, day, month, year)
| % constructor saved in file date.m
| 
| obj = struct;
| obj.minute = [];                % leave blank for whatever reason
| obj.hour = hour;
| obj.day = day;
| obj.month = month;
| obj.year = year;
| 
| obj = class(obj,'date');
| end
| 
| I can overload the operator "." by writing another function
| 
| function [value] = subsref(obj, S)
| 
| idx.type=S.type;
| idx.subs={S.subs};
| 
| 
| switch idx.type
|         case '.'
|                 switch idx.subs{:}
|                         case 'minute'
|                                 value=obj.minute;
|                         case 'hour'
|                                 value=obj.hour;
|                       ...
|                 endswitch
| endswitch
| 
| end
| 
| which works fine
| 
| octave:2> min=obj.minute;
| octave:3> min
| min = [](0x0)
| octave:4> min=obj.hour;
| octave:5> min
| min =  2
| 
| However, using 
| 
| builtin('subsref', obj, idx)
| 
| in
| 
| function [value] = subsref(obj, S)
| 
| idx.type=S.type;
| idx.subs={S.subs};
| 
| value = builtin('subsref', obj, idx);
| 
| end
| 
| results in an error in octave-3.1.55
| 
| octave:9> obj=date(12,2,3,11,2008);
| octave:10> min=obj.hour;
| error: max_recursion_limit exceeded

I checked in the following change.

  http://hg.savannah.gnu.org/hgweb/octave/rev/b2b8ed43b922

Please report bugs to the address@hidden list.

jwe