From help-octave-request at bevo dot che dot wisc dot edu  Tue Jan 23 07:39:46 2001
Subject: Octave_map question.
From: Douglas Eck <doug at idsia dot ch>
To: "help-octave at bevo dot che dot wisc dot edu" <help-octave@bevo.che.wisc.edu>
Date: Tue, 23 Jan 2001 14:39:40 +0100

In 2.1.32 this code works fine. Just call it with something like
Octave2.1>testMap(struct('member',rand(10,10)))    
 
  #include <octave/oct.h>
  #include <octave/ov-struct.h>
  DEFUN_DLD (testMap, args, ,"Just testing.")
  {
    octave_value_list retval;
    Octave_map s = args(0).map_value();
    cout << s["member"].matrix_value() << endl;
    return retval;
  }  

*But* if we declare s and then assign it, the
program segfaults:
  #include <octave/oct.h>
  #include <octave/ov-struct.h>
  DEFUN_DLD (testMap, args, ,"Just testing.")
  {
    octave_value_list retval;
    Octave_map s;
    s = args(0).map_value();
    cout << s["member"].matrix_value() << endl;
    return retval;
  }  

Thus, I cannot do this (i.e. declare Octave_map s outside of an if statement
and assign it inside the if statement):

  Octave_map s;
  if (nargin>0  && args(0).is_map()
)
    s = args(0).map_value();

What should I change?

-Doug



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