Added boost header

test/external/boost/units/detail/dimensionless_unit.hpp

@@ -0,0 +1,88 @@
+// 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) 2007-2008 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_DETAIL_DIMENSIONLESS_UNIT_HPP
+#define BOOST_UNITS_DETAIL_DIMENSIONLESS_UNIT_HPP
+
+#include <boost/mpl/bool.hpp>
+#include <boost/units/units_fwd.hpp>
+
+namespace boost {
+namespace units {
+
+template<class T>
+struct heterogeneous_system;
+
+template<class T>
+struct homogeneous_system;
+
+template<class T1, class T2, class Scale>
+struct heterogeneous_system_impl;
+
+typedef boost::units::heterogeneous_system<
+    boost::units::heterogeneous_system_impl<
+        boost::units::dimensionless_type,
+        boost::units::dimensionless_type,
+        boost::units::dimensionless_type
+    >
+> heterogeneous_dimensionless_system;
+
+namespace detail {
+
+template<class System>
+struct void_if_dimensionless {
+    typedef int type;
+};
+
+template<class T>
+struct void_if_dimensionless<boost::units::homogeneous_system<T> > {
+    typedef void type;
+};
+
+template<>
+struct void_if_dimensionless<heterogeneous_dimensionless_system> {
+    typedef void type;
+};
+
+template<class System, class Test = void>
+struct void_if_heterogeneous {
+    typedef void type;
+};
+
+template<class System>
+struct void_if_heterogeneous<System, typename void_if_dimensionless<System>::type> {
+    typedef int type;
+};
+
+template<class System, class Enable=void>
+struct is_dimensionless_system : mpl::false_ {};
+
+template<class System>
+struct is_dimensionless_system<System, typename void_if_dimensionless<System>::type> : mpl::true_ {};
+
+#define BOOST_UNITS_DIMENSIONLESS_UNIT(T)\
+    boost::units::unit<\
+        boost::units::dimensionless_type,\
+        T,\
+        typename ::boost::units::detail::void_if_dimensionless<T>::type\
+    >
+
+#define BOOST_UNITS_HETEROGENEOUS_DIMENSIONLESS_UNIT(T)\
+    boost::units::unit<\
+        boost::units::dimensionless_type,\
+        T,\
+        typename ::boost::units::detail::void_if_heterogeneous<T>::type\
+    >
+
+}
+}
+}
+
+#endif