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diff --git a/boost/serialization/valarray.hpp b/boost/serialization/valarray.hpp
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+#ifndef BOOST_SERIALIZATION_VALARAY_HPP
+#define BOOST_SERIALIZATION_VALARAY_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// valarray.hpp: serialization for stl vector templates
+
+// (C) Copyright 2005 Matthias Troyer . 
+// 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 <valarray>
+#include <boost/config.hpp>
+#include <boost/serialization/split_free.hpp>
+#include <boost/serialization/array.hpp>
+#include <boost/serialization/collection_size_type.hpp>
+#include <boost/serialization/detail/get_data.hpp>
+
+// function specializations must be defined in the appropriate
+// namespace - boost::serialization
+#if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
+#define STD _STLP_STD
+#else
+#define STD std
+#endif
+
+namespace boost { namespace serialization {
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// valarray< T >
+
+template<class Archive, class U>
+void save( Archive & ar, const STD::valarray<U> &t, const unsigned int /*file_version*/ )
+{
+  const collection_size_type count(t.size());
+  ar << BOOST_SERIALIZATION_NVP(count);
+  if (t.size())
+    ar << make_array(detail::get_data(t), t.size());
+}
+
+
+template<class Archive, class U>
+void load( Archive & ar, STD::valarray<U> &t,  const unsigned int /*file_version*/ )
+{
+  collection_size_type count;
+  ar >> BOOST_SERIALIZATION_NVP(count);
+  t.resize(count);
+  if (t.size())
+    ar >> make_array(detail::get_data(t), t.size());
+}
+
+// split non-intrusive serialization function member into separate
+// non intrusive save/load member functions
+template<class Archive, class U>
+inline void serialize( Archive & ar, STD::valarray<U> & t, const unsigned int file_version)
+{
+    boost::serialization::split_free(ar, t, file_version);
+}
+
+} } // end namespace boost::serialization
+
+#include <boost/serialization/collection_traits.hpp>
+
+BOOST_SERIALIZATION_COLLECTION_TRAITS(STD::valarray)
+#undef STD
+
+#endif // BOOST_SERIALIZATION_VALARAY_HPP