new file mode 100644
--- /dev/null
+++ b/src/oct-lvalue.h
@@ -0,0 +1,112 @@
+/*
+
+Copyright (C) 1996, 1997 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 2, 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, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#if !defined (octave_lvalue_h)
+#define octave_lvalue_h 1
+
+class octave_value;
+class octave_value_list;
+
+#include <string>
+
+#include "oct-obj.h"
+#include "symtab.h"
+
+class
+octave_lvalue
+{
+public:
+
+  octave_lvalue (octave_value *v = 0, symbol_record::sv_function f = 0)
+    : val (v), idx (), chg_fcn (f), struct_elt_name () { }
+
+  octave_lvalue (octave_value *v, const string& nm,
+		 symbol_record::sv_function f = 0)
+    : val (v), idx (), chg_fcn (f), struct_elt_name (nm) { }
+
+  octave_lvalue (const octave_lvalue& vr)
+    : val (vr.val), idx (vr.idx), chg_fcn (vr.chg_fcn),
+      struct_elt_name (vr.struct_elt_name) { }
+
+  octave_lvalue& operator = (const octave_lvalue& vr)
+    {
+      if (this != &vr)
+	{
+	  val = vr.val;
+	  idx = vr.idx;
+	  chg_fcn = vr.chg_fcn;
+	  struct_elt_name = vr.struct_elt_name;
+	}
+
+      return *this;
+    }
+
+  ~octave_lvalue (void) { }
+
+  bool is_defined (void) { return val->is_defined (); }
+
+  bool is_undefined (void) { return val->is_undefined (); }
+
+  bool is_map (void) { return val->is_map (); }
+
+  void define (const octave_value& v) { *val = v; }
+
+  void assign (octave_value::assign_op, const octave_value&);
+
+  octave_lvalue struct_elt_ref (const string& nm)
+    { return val->struct_elt_ref (nm); }
+
+  void index (const octave_value_list& i) { idx = i; }
+
+  void increment (void) { val->increment (); }
+
+  void decrement (void) { val->decrement (); }
+
+  octave_value value (void)
+    {
+      return struct_elt_name.empty ()
+	? (idx.empty ()
+	   ? *val
+	   : val->do_index_op (idx))
+	: (idx.empty ()
+	   ? val->do_struct_elt_index_op (struct_elt_name)
+	   : val->do_struct_elt_index_op (struct_elt_name, idx));
+    }
+
+private:
+
+  octave_value *val;
+
+  octave_value_list idx;
+
+  symbol_record::sv_function chg_fcn;
+
+  string struct_elt_name;
+};
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/