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diff --git a/src/boost/libs/serialization/example/demo_polymorphic_A.hpp b/src/boost/libs/serialization/example/demo_polymorphic_A.hpp
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+++ b/src/boost/libs/serialization/example/demo_polymorphic_A.hpp
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+#ifndef BOOST_SERIALIZATION_EXAMPLE_DEMO_POLYMORPHIC_A_HPP
+#define BOOST_SERIALIZATION_EXAMPLE_DEMO_POLYMORPHIC_A_HPP
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// demo_polymorphic_A.hpp
+
+// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+namespace boost {
+namespace archive {
+
+class polymorphic_iarchive;
+class polymorphic_oarchive;
+
+} // namespace archive
+} // namespace boost
+
+struct A {
+    // class a contains a pointer to a "hidden" declaration
+    template<class Archive>
+    void serialize(
+        Archive & ar,
+        const unsigned int file_version
+    ){
+        ar & data;
+    }
+    int data;
+    bool operator==(const A & rhs) const {
+        return data == rhs.data;
+    }
+    A() :
+        data(0)
+    {}
+};
+
+#endif // BOOST_SERIALIZATION_EXAMPLE_DEMO_POLYMORPHIC_A_HPP