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+#ifndef BOOST_SERIALIZATION_ITEM_VERSION_TYPE_HPP
+#define BOOST_SERIALIZATION_ITEM_VERSION_TYPE_HPP
+
+// (C) Copyright 2010 Robert Ramey
+// 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)
+
+#include <boost/cstdint.hpp> // uint_least8_t
+#include <boost/integer_traits.hpp>
+#include <boost/serialization/level.hpp>
+#include <boost/serialization/is_bitwise_serializable.hpp>
+
+// fixes broken example build on x86_64-linux-gnu-gcc-4.6.0
+#include <boost/assert.hpp>
+
+namespace boost { 
+namespace serialization {
+
+#if defined(_MSC_VER)
+#pragma warning( push )
+#pragma warning( disable : 4244 4267 )
+#endif
+
+class item_version_type {
+private:
+    typedef unsigned int base_type;
+    base_type t;
+public:
+    // should be private - but MPI fails if it's not!!!
+    item_version_type(): t(0) {};
+    explicit item_version_type(const unsigned int t_) : t(t_){
+        BOOST_ASSERT(t_ <= boost::integer_traits<base_type>::const_max);
+    }
+    item_version_type(const item_version_type & t_) : 
+        t(t_.t)
+    {}
+    item_version_type & operator=(item_version_type rhs){
+        t = rhs.t; 
+        return *this;
+    }
+    // used for text output
+    operator base_type () const {
+        return t;
+    }                
+    // used for text input
+    operator base_type & () {
+        return t;
+    }
+    bool operator==(const item_version_type & rhs) const {
+        return t == rhs.t;
+    } 
+    bool operator<(const item_version_type & rhs) const {
+        return t < rhs.t;
+    }
+};
+
+#if defined(_MSC_VER)
+#pragma warning( pop )
+#endif
+
+} } // end namespace boost::serialization
+
+BOOST_IS_BITWISE_SERIALIZABLE(item_version_type)
+
+BOOST_CLASS_IMPLEMENTATION(item_version_type, primitive_type)
+
+#endif //BOOST_SERIALIZATION_ITEM_VERSION_TYPE_HPP