| 1 | /*! |
|---|---|
| 2 | @file |
| 3 | Defines `boost::hana::Hashable`. |
| 4 | |
| 5 | Copyright Louis Dionne 2016 |
| 6 | Copyright Jason Rice 2016 |
| 7 | Distributed under the Boost Software License, Version 1.0. |
| 8 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
| 9 | */ |
| 10 | |
| 11 | #ifndef BOOST_HANA_CONCEPT_HASHABLE_HPP |
| 12 | #define BOOST_HANA_CONCEPT_HASHABLE_HPP |
| 13 | |
| 14 | #include <boost/hana/fwd/concept/hashable.hpp> |
| 15 | |
| 16 | #include <boost/hana/config.hpp> |
| 17 | #include <boost/hana/core/default.hpp> |
| 18 | #include <boost/hana/core/tag_of.hpp> |
| 19 | #include <boost/hana/detail/integral_constant.hpp> |
| 20 | #include <boost/hana/hash.hpp> |
| 21 | |
| 22 | |
| 23 | namespace boost { namespace hana { |
| 24 | template <typename T> |
| 25 | struct Hashable |
| 26 | : hana::integral_constant<bool, |
| 27 | !is_default<hash_impl<typename tag_of<T>::type>>::value |
| 28 | > |
| 29 | { }; |
| 30 | }} // end namespace boost::hana |
| 31 | |
| 32 | #endif // !BOOST_HANA_CONCEPT_HASHABLE_HPP |
| 33 |