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