diff --git a/example/simple_log_archive.hpp b/example/simple_log_archive.hpp
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+++ b/example/simple_log_archive.hpp
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+#ifndef BOOST_SIMPLE_LOG_ARCHIVE_HPP
+#define BOOST_SIMPLE_LOG_ARCHIVE_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// simple_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 <ostream>
+#include <cstddef> // std::size_t
+
+#include <boost/config.hpp>
+#if defined(BOOST_NO_STDC_NAMESPACE)
+namespace std{ 
+    using ::size_t; 
+} // namespace std
+#endif
+
+#include <boost/type_traits/is_enum.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/int.hpp>
+#include <boost/mpl/equal_to.hpp>
+#include <boost/serialization/nvp.hpp>
+#include <boost/serialization/array.hpp>
+#include <boost/serialization/string.hpp>
+#include <boost/serialization/access.hpp>
+
+/////////////////////////////////////////////////////////////////////////
+// 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 simple_log_archive {
+    std::ostream & m_os;
+    unsigned int m_depth;
+
+    template<class Archive>
+    struct save_enum_type {
+        template<class T>
+        static void invoke(Archive &ar, const T &t){
+            ar.m_os << static_cast<int>(t);
+        }
+    };
+    template<class Archive>
+    struct save_primitive {
+        template<class T>
+        static void invoke(Archive & ar, const T & t){
+            ar.m_os << t;
+        }
+    };
+    template<class Archive>
+    struct save_only {
+        template<class T>
+        static void invoke(Archive & ar, const T & t){
+            // make sure call is routed through the highest interface that might
+            // be specialized by the user.
+            boost::serialization::serialize_adl(
+                ar, 
+                const_cast<T &>(t), 
+                ::boost::serialization::version< T >::value
+            );
+        }
+    };
+    template<class T>
+    void save(const T &t){
+        typedef 
+            BOOST_DEDUCED_TYPENAME boost::mpl::eval_if<boost::is_enum< T >,
+                boost::mpl::identity<save_enum_type<simple_log_archive> >,
+            //else
+            BOOST_DEDUCED_TYPENAME boost::mpl::eval_if<
+                // if its primitive
+                    boost::mpl::equal_to<
+                        boost::serialization::implementation_level< T >,
+                        boost::mpl::int_<boost::serialization::primitive_type>
+                    >,
+                    boost::mpl::identity<save_primitive<simple_log_archive> >,
+            // else
+                boost::mpl::identity<save_only<simple_log_archive> >
+            > >::type typex;
+        typex::invoke(*this, t);
+    }    
+    #ifndef BOOST_NO_STD_WSTRING
+    void save(const std::wstring &ws){
+        m_os << "wide string types not suported in log archive";
+    }
+    #endif
+
+public:
+    ///////////////////////////////////////////////////
+    // Implement requirements for archive concept
+
+    typedef boost::mpl::bool_<false> is_loading;
+    typedef boost::mpl::bool_<true> is_saving;
+
+    // this can be a no-op since we ignore pointer polymorphism
+    template<class T>
+    void register_type(const T * = NULL){}
+
+    unsigned int get_library_version(){
+        return 0;
+    }
+
+    void 
+    save_binary(const void *address, std::size_t count){
+        m_os << "save_binary not implemented";
+    }
+
+    // the << operators 
+    template<class T>
+    simple_log_archive & operator<<(T const & t){
+        m_os << ' ';
+        save(t);
+        return * this;
+    }
+    template<class T>
+    simple_log_archive & operator<<(T * const t){
+        m_os << " ->";
+        if(NULL == t)
+            m_os << " null";
+        else
+            *this << * t;
+        return * this;
+    }
+    template<class T, int N>
+    simple_log_archive & operator<<(const T (&t)[N]){
+        return *this << boost::serialization::make_array(
+            static_cast<const T *>(&t[0]),
+            N
+        );
+    }
+    template<class T>
+    simple_log_archive & operator<<(const boost::serialization::nvp< T > & t){
+        m_os << '\n'; // start line with each named object
+        // indent according to object depth
+        for(unsigned int i = 0; i < m_depth; ++i)
+            m_os << ' ';
+        ++m_depth;
+        m_os << t.name(); // output the name of the object
+        * this << t.const_value();
+        --m_depth;
+        return * this;
+    }
+
+    // the & operator 
+    template<class T>
+    simple_log_archive & operator&(const T & t){
+            return * this << t;
+    }
+    ///////////////////////////////////////////////
+
+    simple_log_archive(std::ostream & os) :
+        m_os(os),
+        m_depth(0)
+    {}
+};
+
+#endif // BOOST_SIMPLE_LOG_ARCHIVE_HPP