| 1 | /*! |
|---|---|
| 2 | @file |
| 3 | Defines `boost::hana::any`. |
| 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_ANY_HPP |
| 11 | #define BOOST_HANA_ANY_HPP |
| 12 | |
| 13 | #include <boost/hana/fwd/any.hpp> |
| 14 | |
| 15 | #include <boost/hana/any_of.hpp> |
| 16 | #include <boost/hana/concept/searchable.hpp> |
| 17 | #include <boost/hana/config.hpp> |
| 18 | #include <boost/hana/core/dispatch.hpp> |
| 19 | #include <boost/hana/functional/id.hpp> |
| 20 | |
| 21 | |
| 22 | namespace boost { namespace hana { |
| 23 | //! @cond |
| 24 | template <typename Xs> |
| 25 | constexpr auto any_t::operator()(Xs&& xs) const { |
| 26 | using S = typename hana::tag_of<Xs>::type; |
| 27 | using Any = BOOST_HANA_DISPATCH_IF(any_impl<S>, |
| 28 | hana::Searchable<S>::value |
| 29 | ); |
| 30 | |
| 31 | #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS |
| 32 | static_assert(hana::Searchable<S>::value, |
| 33 | "hana::any(xs) requires 'xs' to be a Searchable"); |
| 34 | #endif |
| 35 | |
| 36 | return Any::apply(static_cast<Xs&&>(xs)); |
| 37 | } |
| 38 | //! @endcond |
| 39 | |
| 40 | template <typename S, bool condition> |
| 41 | struct any_impl<S, when<condition>> : default_ { |
| 42 | template <typename Xs> |
| 43 | static constexpr auto apply(Xs&& xs) |
| 44 | { return hana::any_of(static_cast<Xs&&>(xs), hana::id); } |
| 45 | }; |
| 46 | }} // end namespace boost::hana |
| 47 | |
| 48 | #endif // !BOOST_HANA_ANY_HPP |
| 49 |