]>
Commit | Line | Data |
---|---|---|
1 | /*! | |
2 | @file | |
3 | Defines `boost::hana::zip_shortest`. | |
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_ZIP_SHORTEST_HPP | |
11 | #define BOOST_HANA_ZIP_SHORTEST_HPP | |
12 | ||
13 | #include <boost/hana/fwd/zip_shortest.hpp> | |
14 | ||
15 | #include <boost/hana/concept/sequence.hpp> | |
16 | #include <boost/hana/config.hpp> | |
17 | #include <boost/hana/core/dispatch.hpp> | |
18 | #include <boost/hana/detail/fast_and.hpp> | |
19 | #include <boost/hana/tuple.hpp> | |
20 | #include <boost/hana/zip_shortest_with.hpp> | |
21 | ||
22 | ||
23 | BOOST_HANA_NAMESPACE_BEGIN | |
24 | //! @cond | |
25 | template <typename Xs, typename ...Ys> | |
26 | constexpr auto zip_shortest_t::operator()(Xs&& xs, Ys&& ...ys) const { | |
27 | #ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS | |
28 | static_assert(detail::fast_and< | |
29 | hana::Sequence<Xs>::value, hana::Sequence<Ys>::value... | |
30 | >::value, | |
31 | "hana::zip_shortest(xs, ys...) requires 'xs' and 'ys...' to be Sequences"); | |
32 | #endif | |
33 | ||
34 | return zip_shortest_impl<typename hana::tag_of<Xs>::type>::apply( | |
35 | static_cast<Xs&&>(xs), | |
36 | static_cast<Ys&&>(ys)... | |
37 | ); | |
38 | } | |
39 | //! @endcond | |
40 | ||
41 | template <typename S, bool condition> | |
42 | struct zip_shortest_impl<S, when<condition>> : default_ { | |
43 | template <typename ...Xs> | |
44 | static constexpr decltype(auto) apply(Xs&& ...xs) { | |
45 | return hana::zip_shortest_with(hana::make_tuple, | |
46 | static_cast<Xs&&>(xs)...); | |
47 | } | |
48 | }; | |
49 | BOOST_HANA_NAMESPACE_END | |
50 | ||
51 | #endif // !BOOST_HANA_ZIP_SHORTEST_HPP |