boost/units/is_unit_of_system.hpp

0001 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
0002 // unit/quantity manipulation and conversion
0003 //
0004 // Copyright (C) 2003-2008 Matthias Christian Schabel
0005 // Copyright (C) 2008 Steven Watanabe
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See
0008 // accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010
0011 #ifndef BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP
0012 #define BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP
0013
0014 ///
0015 /// \file
0016 /// \brief Check that a type is a unit in a specified system.
0017 ///
0018
0019 #include <boost/mpl/bool.hpp>
0020 #include <boost/units/units_fwd.hpp>
0021
0022 namespace boost {
0023
0024 namespace units {
0025
0026 /// Check that a type is a unit in a specified system.
0027 template<class T,class System>
0028 struct is_unit_of_system :
0029     public mpl::false_
0030 { };
0031
0032 template<class Dim,class System>
0033 struct is_unit_of_system< unit<Dim,System>,System > :
0034     public mpl::true_
0035 { };
0036
0037 template<class Dim,class System>
0038 struct is_unit_of_system< absolute<unit<Dim,System> >,System > :
0039     public mpl::true_
0040 { };
0041
0042 } // namespace units
0043
0044 } // namespace boost
0045
0046 #endif // BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP