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1 | /*! | |
2 | @file | |
3 | Defines `boost::hana::Metafunction`. | |
4 | ||
5 | @copyright Louis Dionne 2013-2016 | |
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_METAFUNCTION_HPP | |
11 | #define BOOST_HANA_CONCEPT_METAFUNCTION_HPP | |
12 | ||
13 | #include <boost/hana/fwd/concept/metafunction.hpp> | |
14 | ||
15 | #include <boost/hana/config.hpp> | |
16 | #include <boost/hana/core/tag_of.hpp> | |
17 | ||
18 | ||
19 | BOOST_HANA_NAMESPACE_BEGIN | |
20 | namespace detail { | |
21 | template <typename F, typename Tag = typename tag_of<F>::type> | |
22 | struct metafunction_dispatch { | |
23 | static constexpr bool value = Metafunction<Tag>::value; | |
24 | }; | |
25 | ||
26 | template <typename F> | |
27 | struct metafunction_dispatch<F, F> { | |
28 | static constexpr bool value = false; | |
29 | }; | |
30 | } | |
31 | ||
32 | template <typename F> | |
33 | struct Metafunction | |
34 | : detail::metafunction_dispatch<F> | |
35 | { }; | |
36 | BOOST_HANA_NAMESPACE_END | |
37 | ||
38 | #endif // !BOOST_HANA_CONCEPT_METAFUNCTION_HPP |