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Diffstat (limited to 'boost/hana/concept/metafunction.hpp')
-rw-r--r-- | boost/hana/concept/metafunction.hpp | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/boost/hana/concept/metafunction.hpp b/boost/hana/concept/metafunction.hpp new file mode 100644 index 0000000000..ed6d53ad87 --- /dev/null +++ b/boost/hana/concept/metafunction.hpp @@ -0,0 +1,38 @@ +/*! +@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 |