newbie question on using octave structures in external C++ functions

[Jim H]

Hi,
I would like to know how to determine the data type of a field in an octave
data structure passed to a c++ function.  The manual and wiki provide some
good examples, but my problem is to pass in a structure and assign values to
c++ variables used by the external function.  To assign those values, it
seems I need to know if the field is an integer, string, etc.  Here's a
brief example where I could use some help.

#include <octave/oct.h>
#include <octave/ov-struct.h>
int aval;
DEFUN_DLD(shombs_defs,args, , "show mbs defaults")
{
  int nargin = args.length ();
  octave_value_list retval;

  if (nargin != 2)
    print_usage ();
  else
    {
      Octave_map arg0 = args(0).map_value ();
      std::string arg1 = args(1).string_value ();
              for (Octave_map::iterator p0 = arg0.begin() ; 
                    p0 != arg0.end(); p0++ )  {
                     // print keys and values
                     std::cout << " key =>" << arg0.key( p0 ) << std::endl;
                    octave_value( arg0.contents( p0 ) ).print( std::cout ,
false );
                    // how do I do the following?
                    if ( arg0.key(p0) IS "foo" AND arg0.contents(p0)  IS
INTEGER ) {
                          aval = arg0.contents(p0);
                    }
...

Thanks in advance for hints on this, and if there is good place to read
about c++-callable methods that apply to structures, please direct me there.

Jim

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