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+// Copyright 2009-2010 Vicente J. Botet Escriba
+
+// Distributed under the Boost Software License, Version 1.0.
+// See http://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_CHRONO_DETAIL_SYSTEM_HPP
+#define BOOST_CHRONO_DETAIL_SYSTEM_HPP
+
+#include <boost/version.hpp>
+#include <boost/system/error_code.hpp>
+
+#if ((BOOST_VERSION / 100000) < 2) && ((BOOST_VERSION / 100 % 1000) < 44)
+#define BOOST_CHRONO_SYSTEM_CATEGORY boost::system::system_category
+#else
+#define BOOST_CHRONO_SYSTEM_CATEGORY boost::system::system_category()
+#endif
+
+#ifdef BOOST_SYSTEM_NO_DEPRECATED
+#define BOOST_CHRONO_THROWS boost::throws()
+#define BOOST_CHRONO_IS_THROWS(EC) (&EC==&boost::throws())
+#else
+#define BOOST_CHRONO_THROWS boost::system::throws
+#define BOOST_CHRONO_IS_THROWS(EC) (&EC==&boost::system::throws)
+#endif
+
+#endif