| 1 | /*! |
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| 2 | @file |
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| 3 | Defines `boost::hana::detail::nested_by`. |
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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_DETAIL_NESTED_BY_HPP |
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| 11 | #define BOOST_HANA_DETAIL_NESTED_BY_HPP |
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| 12 | |
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| 13 | #include <boost/hana/config.hpp> |
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| 14 | #include <boost/hana/detail/nested_by_fwd.hpp> |
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| 15 | |
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| 16 | #include <boost/hana/functional/flip.hpp> |
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| 17 | #include <boost/hana/functional/partial.hpp> |
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| 18 | |
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| 19 | |
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| 20 | namespace boost { namespace hana { namespace detail { |
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| 21 | //! @cond |
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| 22 | template <typename Algorithm> |
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| 23 | template <typename Predicate, typename Object> |
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| 24 | constexpr decltype(auto) nested_by_t<Algorithm>:: |
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| 25 | operator()(Predicate&& predicate, Object&& object) const { |
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| 26 | return Algorithm{}(static_cast<Object&&>(object), |
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| 27 | static_cast<Predicate&&>(predicate)); |
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| 28 | } |
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| 29 | |
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| 30 | template <typename Algorithm> |
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| 31 | template <typename Predicate> |
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| 32 | constexpr decltype(auto) |
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| 33 | nested_by_t<Algorithm>::operator()(Predicate&& predicate) const { |
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| 34 | return hana::partial(hana::flip(Algorithm{}), |
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| 35 | static_cast<Predicate&&>(predicate)); |
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| 36 | } |
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| 37 | //! @endcond |
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| 38 | } }} // end namespace boost::hana |
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| 39 | |
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| 40 | #endif // !BOOST_HANA_DETAIL_NESTED_BY_HPP |
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| 41 | |
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