63e88f80
 Hu Chunming
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/*!
@file
Defines `boost::hana::Metafunction`.
Copyright Louis Dionne 2013-2022
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>
namespace boost { namespace hana {
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>
{ };
}} // end namespace boost::hana
#endif // !BOOST_HANA_CONCEPT_METAFUNCTION_HPP
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