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+#ifndef BOOST_SERIALIZATION_STATE_SAVER_HPP
+#define BOOST_SERIALIZATION_STATE_SAVER_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
+// state_saver.hpp:
+
+// (C) Copyright 2003-4 Pavel Vozenilek and 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/libs/serialization for updates, documentation, and revision history.
+
+// Inspired by Daryle Walker's iostate_saver concept. This saves the original
+// value of a variable when a state_saver is constructed and restores
+// upon destruction. Useful for being sure that state is restored to
+// variables upon exit from scope.
+
+
+#include <boost/config.hpp>
+#ifndef BOOST_NO_EXCEPTIONS
+ #include <exception>
+#endif
+
+#include <boost/call_traits.hpp>
+#include <boost/noncopyable.hpp>
+#include <boost/type_traits/has_nothrow_copy.hpp>
+#include <boost/detail/no_exceptions_support.hpp>
+
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/identity.hpp>
+
+namespace boost {
+namespace serialization {
+
+template<class T>
+// T requirements:
+// - POD or object semantic (cannot be reference, function, ...)
+// - copy constructor
+// - operator = (no-throw one preferred)
+class state_saver : private boost::noncopyable
+{
+private:
+ const T previous_value;
+ T & previous_ref;
+
+ struct restore {
+ static void invoke(T & previous_ref, const T & previous_value){
+ previous_ref = previous_value; // won't throw
+ }
+ };
+
+ struct restore_with_exception {
+ static void invoke(T & previous_ref, const T & previous_value){
+ BOOST_TRY{
+ previous_ref = previous_value;
+ }
+ BOOST_CATCH(::std::exception &) {
+ // we must ignore it - we are in destructor
+ }
+ BOOST_CATCH_END
+ }
+ };
+
+public:
+ state_saver(
+ T & object
+ ) :
+ previous_value(object),
+ previous_ref(object)
+ {}
+
+ ~state_saver() {
+ #ifndef BOOST_NO_EXCEPTIONS
+ typedef BOOST_DEDUCED_TYPENAME mpl::eval_if<
+ has_nothrow_copy< T >,
+ mpl::identity<restore>,
+ mpl::identity<restore_with_exception>
+ >::type typex;
+ typex::invoke(previous_ref, previous_value);
+ #else
+ previous_ref = previous_value;
+ #endif
+ }
+
+}; // state_saver<>
+
+} // serialization
+} // boost
+
+#endif //BOOST_SERIALIZATION_STATE_SAVER_HPP