From bug-request at octave dot org Thu Nov 17 06:38:26 2005
Subject: problem accessing structures
From: Stefan van der Walt <stefan at sun dot ac dot za>
To: bug at octave dot org
Date: Thu, 17 Nov 2005 14:41:46 +0200

I have problems assigning elements in structures (using Octave 2.1.71,
Ubuntu package).

Compile this OCT-file (from the wiki):

#include <octave/oct.h>
#include <octave/oct-map.h>
DEFUN_DLD (structure, args, , "quick and dirty demo")
{   
      octave_value_list retval;
      Octave_map a (args(0).map_value());
      Octave_map ab (a.contents (a.seek ("b"))(0).map_value());
      ab.assign ("c", -1.0);
      a.assign ("b", ab);
      retval(0) = a;
      return retval;
}

Then run the following sequence:

octave:1> a.a = 0; a.b.a = 1; a.b.b = 2;
octave:2> a = structure (a)
panic: Segmentation fault -- stopping myself...
attempting to save variables to `octave-core'...
save to `octave-core' complete
Segmentation fault

Can someone verify whether this behaviour is present in the latest
development release?  AFAIK, it is not present in the 2.9.x branch.

Stéfan



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