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diff --git a/src/boost/libs/serialization/example/demo_dll_b.hpp b/src/boost/libs/serialization/example/demo_dll_b.hpp
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+++ b/src/boost/libs/serialization/example/demo_dll_b.hpp
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+#ifndef BOOST_SERIALIZATION_TEST_B_HPP
+#define BOOST_SERIALIZATION_TEST_B_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// B.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)
+
+//  See http://www.boost.org for updates, documentation, and revision history.
+
+#include <cstdlib> // for rand()
+#include <boost/math/special_functions/next.hpp>
+
+#include <boost/config.hpp>
+#if defined(BOOST_NO_STDC_NAMESPACE)
+namespace std{
+    using ::rand; 
+}
+#endif
+
+#include <boost/serialization/version.hpp>
+#include <boost/serialization/split_member.hpp>
+#include <boost/serialization/base_object.hpp>
+
+#include "A.hpp"
+
+///////////////////////////////////////////////////////
+// Derived class test
+class B : public A
+{
+private:
+    friend class boost::serialization::access;
+    template<class Archive>
+    void save(Archive &ar, const unsigned int /* file_version */) const
+    {
+        // write any base class info to the archive
+        ar << BOOST_SERIALIZATION_BASE_OBJECT_NVP(A);
+
+        // write out members
+        ar << BOOST_SERIALIZATION_NVP(s);
+        ar << BOOST_SERIALIZATION_NVP(t);
+        ar << BOOST_SERIALIZATION_NVP(u);
+        ar << BOOST_SERIALIZATION_NVP(v);
+        ar << BOOST_SERIALIZATION_NVP(w);
+        ar << BOOST_SERIALIZATION_NVP(x);
+    }
+
+    template<class Archive>
+    void load(Archive & ar, const unsigned int file_version)
+    {
+        // read any base class info to the archive
+        ar >> BOOST_SERIALIZATION_BASE_OBJECT_NVP(A);
+        switch(file_version){
+        case 1:
+        case 2:
+            ar >> BOOST_SERIALIZATION_NVP(s);
+            ar >> BOOST_SERIALIZATION_NVP(t);
+            ar >> BOOST_SERIALIZATION_NVP(u);
+            ar >> BOOST_SERIALIZATION_NVP(v);
+            ar >> BOOST_SERIALIZATION_NVP(w);
+            ar >> BOOST_SERIALIZATION_NVP(x);
+        default:
+            break;
+        }
+    }
+
+    BOOST_SERIALIZATION_SPLIT_MEMBER()
+    signed char s;
+    unsigned char t;
+    signed int u;
+    unsigned int v;
+    float w;
+    double x;
+public:
+    B();
+    virtual ~B(){};
+    bool operator==(const B &rhs) const;
+};
+
+B::B() :
+    s(std::rand()),
+    t(std::rand()),
+    u(std::rand()),
+    v(std::rand()),
+    w((float)std::rand() / std::rand()),
+    x((double)std::rand() / std::rand())
+{
+}
+
+BOOST_CLASS_VERSION(B, 2)
+
+inline bool B::operator==(const B &rhs) const
+{
+    return
+        A::operator==(rhs)
+        && s == rhs.s 
+        && t == rhs.t 
+        && u == rhs.u 
+        && v == rhs.v 
+        && std::abs( boost::math::float_distance(w, rhs.w)) < 2
+        && std::abs( boost::math::float_distance(x, rhs.x)) < 2
+    ;
+}
+
+#endif // BOOST_SERIALIZATION_TEST_B_HPP