new file mode 100644
--- /dev/null
+++ b/src/pt-cbinop.h
@@ -0,0 +1,78 @@
+/*
+
+Copyright (C) 2008 Jaroslav Hajek
+
+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_tree_cbinop_h)
+#define octave_tree_cbinop_h 1
+
+#include <string>
+
+class tree_walker;
+
+class octave_value;
+class octave_value_list;
+class octave_lvalue;
+
+#include "ov.h"
+#include "pt-binop.h"
+#include "symtab.h"
+
+// Binary expressions that can be reduced to compound operations
+
+class
+tree_compound_binary_expression : public tree_binary_expression
+{
+public:
+
+  tree_compound_binary_expression (tree_expression *a, tree_expression *b,
+                                   int l, int c,
+                                   octave_value::binary_op t,
+                                   tree_expression *ca, tree_expression *cb,
+                                   octave_value::compound_binary_op ct)
+    : tree_binary_expression (a, b, l, c, t), op_lhs (ca), op_rhs (cb),
+      etype (ct) { }
+
+  octave_value rvalue (void);
+
+  octave_value::compound_binary_op cop_type (void) const { return etype; }
+
+private:
+
+  tree_expression *op_lhs;
+  tree_expression *op_rhs;
+  octave_value::compound_binary_op etype;
+};
+
+// a "virtual constructor"
+
+tree_binary_expression *
+maybe_compound_binary_expression (tree_expression *a, tree_expression *b,
+                                  int l = -1, int c = -1,
+                                  octave_value::binary_op t
+                                  = octave_value::unknown_binary_op);
+
+#endif
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; End: ***
+*/