| 1 | /*! |
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| 2 | @file |
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| 3 | Defines `boost::hana::symmetric_difference`. |
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| 4 | |
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| 5 | Copyright Louis Dionne 2013-2022 |
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| 6 | Distributed under the Boost Software License, Version 1.0. |
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| 7 | (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt) |
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| 8 | */ |
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| 9 | |
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| 10 | #ifndef BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP |
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| 11 | #define BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP |
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| 12 | |
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| 13 | #include <boost/hana/fwd/symmetric_difference.hpp> |
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| 14 | |
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| 15 | #include <boost/hana/config.hpp> |
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| 16 | #include <boost/hana/core/dispatch.hpp> |
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| 17 | #include <boost/hana/difference.hpp> |
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| 18 | #include <boost/hana/union.hpp> |
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| 19 | |
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| 20 | |
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| 21 | namespace boost { namespace hana { |
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| 22 | //! @cond |
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| 23 | template <typename Xs, typename Ys> |
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| 24 | constexpr auto symmetric_difference_t::operator()(Xs&& xs, Ys&& ys) const { |
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| 25 | using S = typename hana::tag_of<Xs>::type; |
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| 26 | using SymmetricDifference = BOOST_HANA_DISPATCH_IF(symmetric_difference_impl<S>, |
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| 27 | true |
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| 28 | ); |
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| 29 | |
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| 30 | return SymmetricDifference::apply(static_cast<Xs&&>(xs), static_cast<Ys&&>(ys)); |
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| 31 | } |
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| 32 | //! @endcond |
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| 33 | |
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| 34 | template <typename S, bool condition> |
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| 35 | struct symmetric_difference_impl<S, when<condition>> : default_ { |
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| 36 | template <typename Xs, typename Ys> |
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| 37 | static constexpr auto apply(Xs&& xs, Ys&& ys) { |
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| 38 | return hana::union_( |
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| 39 | hana::difference(xs, ys), |
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| 40 | hana::difference(ys, xs) |
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| 41 | ); |
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| 42 | } |
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| 43 | }; |
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| 44 | }} // end namespace boost::hana |
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| 45 | |
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| 46 | #endif // !BOOST_HANA_SYMMETRIC_DIFFERENCE_HPP |
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| 47 | |
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