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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// Distributed under 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)
+
+#ifndef BOOST_UNITS_SI_BASE_HPP
+#define BOOST_UNITS_SI_BASE_HPP
+
+#include <string>
+
+#include <boost/units/static_constant.hpp>
+#include <boost/units/unit.hpp>
+#include <boost/units/make_system.hpp>
+
+#include <boost/units/base_units/si/meter.hpp>
+#include <boost/units/base_units/si/kilogram.hpp>
+#include <boost/units/base_units/si/second.hpp>
+#include <boost/units/base_units/si/ampere.hpp>
+#include <boost/units/base_units/si/kelvin.hpp>
+#include <boost/units/base_units/si/mole.hpp>
+#include <boost/units/base_units/si/candela.hpp>
+#include <boost/units/base_units/angle/radian.hpp>
+#include <boost/units/base_units/angle/steradian.hpp>
+
+namespace boost {
+
+namespace units {
+
+namespace si {
+
+/// placeholder class defining si unit system
+typedef make_system<meter_base_unit,
+ kilogram_base_unit,
+ second_base_unit,
+ ampere_base_unit,
+ kelvin_base_unit,
+ mole_base_unit,
+ candela_base_unit,
+ angle::radian_base_unit,
+ angle::steradian_base_unit>::type system;
+
+/// dimensionless si unit
+typedef unit<dimensionless_type,system> dimensionless;
+
+} // namespace si
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_SI_BASE_HPP