| 1 | /*! |
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| 2 | @file |
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| 3 | Forward declares `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_FWD_SYMMETRIC_DIFFERENCE_HPP |
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| 11 | #define BOOST_HANA_FWD_SYMMETRIC_DIFFERENCE_HPP |
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| 12 | |
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| 13 | #include <boost/hana/config.hpp> |
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| 14 | #include <boost/hana/core/when.hpp> |
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| 15 | |
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| 16 | |
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| 17 | namespace boost { namespace hana { |
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| 18 | // Note: This function is documented per datatype/concept only. |
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| 19 | //! @cond |
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| 20 | template <typename S, typename = void> |
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| 21 | struct symmetric_difference_impl : symmetric_difference_impl<S, when<true>> { }; |
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| 22 | //! @endcond |
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| 23 | |
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| 24 | struct symmetric_difference_t { |
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| 25 | template <typename Xs, typename Ys> |
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| 26 | constexpr auto operator()(Xs&&, Ys&&) const; |
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| 27 | }; |
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| 28 | |
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| 29 | BOOST_HANA_INLINE_VARIABLE constexpr symmetric_difference_t symmetric_difference{}; |
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| 30 | }} // end namespace boost::hana |
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| 31 | |
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| 32 | #endif // !BOOST_HANA_FWD_SYMMETRIC_DIFFERENCE_HPP |
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| 33 | |
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