1 // Boost.Units - A C++ library for zero-overhead dimensional analysis and 2 // unit/quantity manipulation and conversion 3 // 4 // Copyright (C) 2003-2008 Matthias Christian Schabel 5 // Copyright (C) 2008 Steven Watanabe 6 // 7 // Distributed under the Boost Software License, Version 1.0. (See 8 // accompanying file LICENSE_1_0.txt or copy at 9 // http://www.boost.org/LICENSE_1_0.txt) 10 11 #ifndef BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP 12 #define BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP 13 14 /// 15 /// \file 16 /// \brief Check that a type is a unit in a specified system. 17 /// 18 19 #include <boost/mpl/bool.hpp> 20 #include <boost/units/units_fwd.hpp> 21 22 namespace boost { 23 24 namespace units { 25 26 /// Check that a type is a unit in a specified system. 27 template<class T,class System> 28 struct is_unit_of_system : 29 public mpl::false_ 30 { }; 31 32 template<class Dim,class System> 33 struct is_unit_of_system< unit<Dim,System>,System > : 34 public mpl::true_ 35 { }; 36 37 template<class Dim,class System> 38 struct is_unit_of_system< absolute<unit<Dim,System> >,System > : 39 public mpl::true_ 40 { }; 41 42 } // namespace units 43 44 } // namespace boost 45 46 #endif // BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP 47