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1 | /*! |
2 | @file | |
3 | Forward declares `boost::hana::union_`. | |
4 | ||
5 | @copyright Louis Dionne 2013-2017 | |
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_FWD_UNION_HPP | |
11 | #define BOOST_HANA_FWD_UNION_HPP | |
12 | ||
13 | #include <boost/hana/config.hpp> | |
14 | #include <boost/hana/core/when.hpp> | |
15 | ||
16 | ||
17 | BOOST_HANA_NAMESPACE_BEGIN | |
18 | // Note: This function is documented per datatype/concept only. | |
19 | //! @cond | |
20 | template <typename T, typename = void> | |
21 | struct union_impl : union_impl<T, when<true>> { }; | |
22 | //! @endcond | |
23 | ||
24 | struct union_t { | |
25 | template <typename Xs, typename Ys> | |
26 | constexpr auto operator()(Xs&&, Ys&&) const; | |
27 | }; | |
28 | ||
29 | constexpr union_t union_{}; | |
30 | BOOST_HANA_NAMESPACE_END | |
31 | ||
32 | #endif // !BOOST_HANA_FWD_UNION_HPP |