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/*! @file Defines `boost::hana::Metafunction`. @copyright Louis Dionne 2013-2017 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> #include <boost/hana/detail/integral_constant.hpp> BOOST_HANA_NAMESPACE_BEGIN namespace detail { template <typename F, typename Tag = typename tag_of<F>::type> struct metafunction_dispatch : hana::integral_constant<bool, Metafunction<Tag>::value > { }; template <typename F> struct metafunction_dispatch<F, F> : hana::integral_constant<bool, false> { }; } template <typename F> struct Metafunction : detail::metafunction_dispatch<F> { }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_CONCEPT_METAFUNCTION_HPP
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