More flexible refcount to account for owned back-references. * libinterp/octave-value/ov-classdef.h (cdef_object_rep::static_count, cdef_object_rep::destroy): New virtual methods. (cdef_object_rep::refcount): Use octave_idx_type as counter type. (cdef_object_rep::release): New method. (cdef_object::~cdef_object, cdef_object::cdef_object (cdef_object)): Use it. (cdef_class::cdef_class_rep::member_count): New member. (cdef_class::cdef_class_rep::cdef_class_rep ()): Initialize it. (cdef_class::cdef_class_rep::static_count, cdef_class::cdef_class_rep::destroy): New methods. (cdef_package::cdef_package_rep::member_count): New member. (cdef_package::cdef_package_rep::cdef_package_rep ()): Initialize it. (cdef_package::cdef_package_rep::static_count, cdef_package::cdef_package_rep::destroy): New methods. * libinterp/octave-value/ov-classdef.cc (octave_classdef_proxy::~octave_classdef_proxy): Remove owned cdef_class from all_classes. (cdef_class::cdef_class_rep::cdef_class_rep (std::list<cdef_class>)): Initialize member_count. (cdef_class::cdef_class_rep::install_method, cdef_class::cdef_class_rep::install_property): Increment member_count. (cdef_package::cdef_package_rep::install_class, cdef_package::cdef_package_rep::install_package): Likewise.

#include <octave/oct.h>

DEFUN_DLD (stringdemo, args, , "String Demo")
{
  int nargin = args.length ();
  octave_value_list retval;

  if (nargin != 1)
    print_usage ();
  else
    {
      charMatrix ch = args(0).char_matrix_value ();

      if (! error_state)
        {
          if (args(0).is_sq_string ())
            retval(1) = octave_value (ch, true);
          else
            retval(1) = octave_value (ch, true, '\'');

          octave_idx_type nr = ch.rows ();
          for (octave_idx_type i = 0; i < nr / 2; i++)
            {
              std::string tmp = ch.row_as_string (i);
              ch.insert (ch.row_as_string (nr-i-1).c_str (),
                         i, 0);
              ch.insert (tmp.c_str (), nr-i-1, 0);
            }
          retval(0) = octave_value (ch, true);
        }
    }
  return retval;
}