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- /*!
- @file
- Defines `boost::hana::Metafunction`.
- @copyright Louis Dionne 2013-2016
- Distributed under the Boost Software License, Version 1.0.
- (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- */
- #ifndef BOOST_HANA_CONCEPT_METAFUNCTION_HPP
- #define BOOST_HANA_CONCEPT_METAFUNCTION_HPP
- #include <boost/hana/fwd/concept/metafunction.hpp>
- #include <boost/hana/config.hpp>
- #include <boost/hana/core/tag_of.hpp>
- BOOST_HANA_NAMESPACE_BEGIN
- namespace detail {
- template <typename F, typename Tag = typename tag_of<F>::type>
- struct metafunction_dispatch {
- static constexpr bool value = Metafunction<Tag>::value;
- };
- template <typename F>
- struct metafunction_dispatch<F, F> {
- static constexpr bool value = false;
- };
- }
- template <typename F>
- struct Metafunction
- : detail::metafunction_dispatch<F>
- { };
- BOOST_HANA_NAMESPACE_END
- #endif // !BOOST_HANA_CONCEPT_METAFUNCTION_HPP
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