1 /*! 2 @file 3 Defines `boost::hana::Orderable`. 4 5 @copyright Louis Dionne 2013-2017 6 Distributed under the Boost Software License, Version 1.0. 7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) 8 */ 9 10 #ifndef BOOST_HANA_CONCEPT_ORDERABLE_HPP 11 #define BOOST_HANA_CONCEPT_ORDERABLE_HPP 12 13 #include <boost/hana/fwd/concept/orderable.hpp> 14 15 #include <boost/hana/config.hpp> 16 #include <boost/hana/core/default.hpp> 17 #include <boost/hana/core/tag_of.hpp> 18 #include <boost/hana/detail/integral_constant.hpp> 19 #include <boost/hana/less.hpp> 20 21 22 BOOST_HANA_NAMESPACE_BEGIN 23 template <typename Ord> 24 struct Orderable 25 : hana::integral_constant<bool, 26 !is_default<less_impl<typename tag_of<Ord>::type, 27 typename tag_of<Ord>::type>>::value 28 > 29 { }; 30 BOOST_HANA_NAMESPACE_END 31 32 #endif // !BOOST_HANA_CONCEPT_ORDERABLE_HPP 33