hana/concept/comparable.hpp

0001 /*!
0002 @file
0003 Defines `boost::hana::Comparable`.
0004
0005 Copyright Louis Dionne 2013-2022
0006 Distributed under the Boost Software License, Version 1.0.
0007 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
0008  */
0009
0010 #ifndef BOOST_HANA_CONCEPT_COMPARABLE_HPP
0011 #define BOOST_HANA_CONCEPT_COMPARABLE_HPP
0012
0013 #include <boost/hana/fwd/concept/comparable.hpp>
0014
0015 #include <boost/hana/config.hpp>
0016 #include <boost/hana/core/default.hpp>
0017 #include <boost/hana/core/tag_of.hpp>
0018 #include <boost/hana/detail/integral_constant.hpp>
0019 #include <boost/hana/equal.hpp>
0020
0021
0022 namespace boost { namespace hana {
0023     template <typename T>
0024     struct Comparable
0025         : hana::integral_constant<bool,
0026             !is_default<equal_impl<typename tag_of<T>::type,
0027                                    typename tag_of<T>::type>>::value
0028         >
0029     { };
0030 }} // end namespace boost::hana
0031
0032 #endif // !BOOST_HANA_CONCEPT_COMPARABLE_HPP