| 1 | /*! |
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| 2 | @file |
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| 3 | Defines `boost::hana::reverse_fold`. |
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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_REVERSE_FOLD_HPP |
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| 11 | #define BOOST_HANA_REVERSE_FOLD_HPP |
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| 12 | |
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| 13 | #include <boost/hana/fwd/reverse_fold.hpp> |
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| 14 | |
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| 15 | #include <boost/hana/config.hpp> |
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| 16 | #include <boost/hana/fold_right.hpp> |
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| 17 | #include <boost/hana/functional/flip.hpp> |
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| 18 | |
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| 19 | |
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| 20 | namespace boost { namespace hana { |
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| 21 | //! @cond |
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| 22 | template <typename Xs, typename S, typename F> |
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| 23 | constexpr decltype(auto) reverse_fold_t::operator()(Xs&& xs, S&& s, F&& f) const { |
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| 24 | return hana::fold_right(static_cast<Xs&&>(xs), |
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| 25 | static_cast<S&&>(s), |
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| 26 | hana::flip(static_cast<F&&>(f))); |
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| 27 | } |
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| 28 | |
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| 29 | template <typename Xs, typename F> |
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| 30 | constexpr decltype(auto) reverse_fold_t::operator()(Xs&& xs, F&& f) const { |
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| 31 | return hana::fold_right(static_cast<Xs&&>(xs), |
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| 32 | hana::flip(static_cast<F&&>(f))); |
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| 33 | } |
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| 34 | //! @endcond |
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| 35 | }} // end namespace boost::hana |
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| 36 | |
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| 37 | #endif // !BOOST_HANA_REVERSE_FOLD_HPP |
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| 38 | |
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