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| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*! |
| 2 | @file | |
| 3 | Forward declares `boost::hana::intersection`. | |
| 4 | ||
| 5 | @copyright Louis Dionne 2013-2016 | |
| 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_INTERSECTION_HPP | |
| 11 | #define BOOST_HANA_FWD_INTERSECTION_HPP | |
| 12 | ||
| 13 | #include <boost/hana/config.hpp> | |
| 14 | #include <boost/hana/core/when.hpp> | |
| 15 | ||
| 16 | ||
| 17 | BOOST_HANA_NAMESPACE_BEGIN | |
| 18 | //! Returns the intersection of two sets. | |
| 19 | //! @relates hana::set | |
| 20 | //! | |
| 21 | //! Given two sets `xs` and `ys`, `intersection(xs, ys)` is a new set | |
| 22 | //! containing exactly those elements that are present both in `xs` and | |
| 23 | //! in `ys`. In other words, the following holds for any object `x`: | |
| 24 | //! @code | |
| 25 | //! x ^in^ intersection(xs, ys) if and only if x ^in^ xs && x ^in^ ys | |
| 26 | //! @endcode | |
| 27 | //! | |
| 28 | //! | |
| 29 | //! @param xs, ys | |
| 30 | //! Two sets to intersect. | |
| 31 | //! | |
| 32 | //! | |
| 33 | //! Example | |
| 34 | //! ------- | |
| 35 | //! @include example/intersection.cpp | |
| 36 | #ifdef BOOST_HANA_DOXYGEN_INVOKED | |
| 37 | constexpr auto intersection = [](auto&& xs, auto&& ys) { | |
| 38 | return tag-dispatched; | |
| 39 | }; | |
| 40 | #else | |
| 41 | template <typename S, typename = void> | |
| 42 | struct intersection_impl : intersection_impl<S, when<true>> { }; | |
| 43 | ||
| 44 | struct intersection_t { | |
| 45 | template <typename Xs, typename Ys> | |
| 46 | constexpr auto operator()(Xs&& xs, Ys&& ys) const; | |
| 47 | }; | |
| 48 | ||
| 49 | constexpr intersection_t intersection{}; | |
| 50 | #endif | |
| 51 | BOOST_HANA_NAMESPACE_END | |
| 52 | ||
| 53 | #endif // !BOOST_HANA_FWD_INTERSECTION_HPP |