--- a/src/ov-base.h	Fri Nov 12 16:18:17 1999 +0000
+++ b/src/ov-base.h	Mon Nov 15 16:17:06 1999 +0000
@@ -40,6 +40,7 @@
 #include "ov.h"
 #include "ov-typeinfo.h"
 
+class Cell;
 class Octave_map;
 class octave_value_list;
 
@@ -92,6 +93,8 @@
 
   bool is_defined (void) const { return false; }
 
+  bool is_cell (void) const { return false; }
+
   bool is_real_scalar (void) const { return false; }
 
   bool is_real_matrix (void) const { return false; }
@@ -163,6 +166,8 @@
   double scalar_value (bool frc_str_conv = false) const
     { return double_value (frc_str_conv); }
 
+  Cell cell_value (bool = false) const;
+
   Matrix matrix_value (bool = false) const;
 
   Complex complex_value (bool = false) const;