| 1 | /*! |
|---|---|
| 2 | @file |
| 3 | Defines `boost::hana::IntegralConstant`. |
| 4 | |
| 5 | Copyright Louis Dionne 2013-2022 |
| 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_INTEGRAL_CONSTANT_HPP |
| 11 | #define BOOST_HANA_CONCEPT_INTEGRAL_CONSTANT_HPP |
| 12 | |
| 13 | #include <boost/hana/fwd/concept/integral_constant.hpp> |
| 14 | |
| 15 | #include <boost/hana/config.hpp> |
| 16 | #include <boost/hana/core/tag_of.hpp> |
| 17 | #include <boost/hana/detail/integral_constant.hpp> |
| 18 | |
| 19 | |
| 20 | namespace boost { namespace hana { |
| 21 | namespace detail { |
| 22 | template <typename C, typename Tag = typename tag_of<C>::type> |
| 23 | struct integral_constant_dispatch |
| 24 | : hana::integral_constant<bool, |
| 25 | hana::IntegralConstant<Tag>::value |
| 26 | > |
| 27 | { }; |
| 28 | |
| 29 | template <typename C> |
| 30 | struct integral_constant_dispatch<C, C> |
| 31 | : hana::integral_constant<bool, false> |
| 32 | { }; |
| 33 | } |
| 34 | |
| 35 | //! @cond |
| 36 | template <typename C> |
| 37 | struct IntegralConstant |
| 38 | : detail::integral_constant_dispatch<C> |
| 39 | { }; |
| 40 | //! @endcond |
| 41 | }} // end namespace boost::hana |
| 42 | |
| 43 | #endif // !BOOST_HANA_CONCEPT_INTEGRAL_CONSTANT_HPP |
| 44 |