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diff --git a/src/boost/libs/serialization/example/log_archive.hpp b/src/boost/libs/serialization/example/log_archive.hpp
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+++ b/src/boost/libs/serialization/example/log_archive.hpp
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+#ifndef LOG_ARCHIVE_HPP
+#define LOG_ARCHIVE_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// log_archive.hpp
+
+// (C) Copyright 2010 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 <boost/archive/xml_oarchive.hpp>
+
+namespace boost {
+    namespace archive {
+        namespace detail {
+            template<class Archive> class interface_oarchive;
+        } // namespace detail
+    } // namespace archive
+} // boost
+
+/////////////////////////////////////////////////////////////////////////
+// log data to an output stream.  This illustrates a simpler implemenation
+// of text output which is useful for getting a formatted display of
+// any serializable class.  Intended to be useful as a debugging aid.
+class log_archive :
+    /* protected ? */
+    public boost::archive::xml_oarchive_impl<log_archive>
+{
+    typedef boost::archive::xml_oarchive_impl<log_archive> base;
+    // give serialization implementation access to this clas
+    friend class boost::archive::detail::interface_oarchive<log_archive>;
+    friend class boost::archive::basic_xml_oarchive<log_archive>;
+    friend class boost::archive::save_access;
+
+    /////////////////////////////////////////////////////////////////////
+    // Override functions defined in basic_xml_oarchive
+
+    // Anything not an attribute and not a name-value pair is an
+    // error and should be trapped here.
+    template<class T>
+    void save_override(T & t){
+        // make it a name-value pair and pass it on.
+        // this permits this to be used even with data types which
+        // are not wrapped with the name
+        base::save_override(boost::serialization::make_nvp(NULL, t));
+    }
+    template<class T>
+    void save_override(const boost::serialization::nvp< T > & t){
+        // this is here to remove the "const" requirement.  Since
+        // this class is to be used only for output, it's not required.
+        base::save_override(t);
+    }
+    // specific overrides for attributes - not name value pairs so we
+    // want to trap them before the above "fall through"
+    // since we don't want to see these in the output - make them no-ops.
+    void save_override(const boost::archive::object_id_type & t){}
+    void save_override(const boost::archive::object_reference_type & t){}
+    void save_override(const boost::archive::version_type & t){}
+    void save_override(const boost::archive::class_id_type & t){}
+    void save_override(const boost::archive::class_id_optional_type & t){}
+    void save_override(const boost::archive::class_id_reference_type & t){}
+    void save_override(const boost::archive::class_name_type & t){}
+    void save_override(const boost::archive::tracking_type & t){}
+public:
+    log_archive(std::ostream & os, unsigned int flags = 0) :
+        boost::archive::xml_oarchive_impl<log_archive>(
+            os,
+            flags | boost::archive::no_header
+        )
+    {}
+};
+
+#endif // LOG_ARCHIVE_HPP