--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libinterp/corefcn/oct-handle.h	Wed Oct 02 19:52:39 2013 -0400
@@ -0,0 +1,147 @@
+/*
+
+Copyright (C) 2007-2012 John W. Eaton
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#if !defined (octave_handle_h)
+#define octave_handle_h 1
+
+#include "dMatrix.h"
+#include "lo-ieee.h"
+
+#include "ov.h"
+
+// ---------------------------------------------------------------------
+
+class octave_handle
+{
+public:
+  octave_handle (void) : val (octave_NaN) { }
+
+  octave_handle (const octave_value& a)
+    : val (octave_NaN)
+  {
+    if (a.is_empty ())
+      /* do nothing */;
+    else
+      {
+        double tval = a.double_value ();
+
+        if (! error_state)
+          val = tval;
+        else
+          error ("invalid handle");
+      }
+  }
+
+  octave_handle (int a) : val (a) { }
+
+  octave_handle (double a) : val (a) { }
+
+  octave_handle (const octave_handle& a) : val (a.val) { }
+
+  octave_handle& operator = (const octave_handle& a)
+  {
+    if (&a != this)
+      val = a.val;
+
+    return *this;
+  }
+
+  ~octave_handle (void) { }
+
+  double value (void) const { return val; }
+
+  octave_value as_octave_value (void) const
+  {
+    return ok () ? octave_value (val) : octave_value (Matrix ());
+  }
+
+  // Prefix increment/decrement operators.
+  octave_handle& operator ++ (void)
+  {
+    ++val;
+    return *this;
+  }
+
+  octave_handle& operator -- (void)
+  {
+    --val;
+    return *this;
+  }
+
+  // Postfix increment/decrement operators.
+  const octave_handle operator ++ (int)
+  {
+    octave_handle old_value = *this;
+    ++(*this);
+    return old_value;
+  }
+
+  const octave_handle operator -- (int)
+  {
+    octave_handle old_value = *this;
+    --(*this);
+    return old_value;
+  }
+
+  bool ok (void) const { return ! xisnan (val); }
+
+private:
+  double val;
+};
+
+inline bool
+operator == (const octave_handle& a, const octave_handle& b)
+{
+  return a.value () == b.value ();
+}
+
+inline bool
+operator != (const octave_handle& a, const octave_handle& b)
+{
+  return a.value () != b.value ();
+}
+
+inline bool
+operator < (const octave_handle& a, const octave_handle& b)
+{
+  return a.value () < b.value ();
+}
+
+inline bool
+operator <= (const octave_handle& a, const octave_handle& b)
+{
+  return a.value () <= b.value ();
+}
+
+inline bool
+operator >= (const octave_handle& a, const octave_handle& b)
+{
+  return a.value () >= b.value ();
+}
+
+inline bool
+operator > (const octave_handle& a, const octave_handle& b)
+{
+  return a.value () > b.value ();
+}
+
+#endif