1/*!
2@file
3Defines `boost::hana::zip_shortest`.
4
5Copyright Louis Dionne 2013-2022
6Distributed 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
23namespace boost { namespace hana {
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}} // end namespace boost::hana
50
51#endif // !BOOST_HANA_ZIP_SHORTEST_HPP
52

source code of boost/libs/hana/include/boost/hana/zip_shortest.hpp