summaryrefslogtreecommitdiff
path: root/boost/units/detail/dimensionless_unit.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'boost/units/detail/dimensionless_unit.hpp')
-rw-r--r--boost/units/detail/dimensionless_unit.hpp88
1 files changed, 88 insertions, 0 deletions
diff --git a/boost/units/detail/dimensionless_unit.hpp b/boost/units/detail/dimensionless_unit.hpp
new file mode 100644
index 0000000..291bec4
--- /dev/null
+++ b/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