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_DIMENSION_LIST_HPP 12 #define BOOST_UNITS_IS_DIMENSION_LIST_HPP 13 14 /// 15 /// \file 16 /// \brief Check that a type is a valid dimension list. 17 /// 18 19 #include <boost/mpl/bool.hpp> 20 21 #include <boost/units/units_fwd.hpp> 22 23 namespace boost { 24 25 namespace units { 26 27 /// Check that a type is a valid dimension list. 28 template<typename Seq> 29 struct is_dimension_list : 30 public mpl::false_ 31 { }; 32 33 template<typename Item, typename Next> 34 struct is_dimension_list<list<Item, Next> > : 35 public mpl::true_ 36 { }; 37 38 template<> 39 struct is_dimension_list<dimensionless_type> : 40 public mpl::true_ 41 { }; 42 43 } // namespace units 44 45 } // namespace boost 46 47 #endif // BOOST_UNITS_IS_DIMENSION_LIST_HPP 48