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diff --git a/misc/swig/callback/callback.swigcxx b/misc/swig/callback/callback.swigcxx
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+++ b/misc/swig/callback/callback.swigcxx
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+/* Copyright 2011 The Go Authors. All rights reserved.
+   Use of this source code is governed by a BSD-style
+   license that can be found in the LICENSE file.  */
+
+/* An example of writing a C++ virtual function in Go.  */
+
+%module(directors="1") callback
+
+%{
+#include <string>
+#include "callback.h"
+%}
+
+%include "std_string.i"
+
+%feature("director");
+
+%include "callback.h"