598bfd3f
 Hu Chunming
提交_GLIBCXX_USE_CX...
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/*!
@file
Defines `boost::hana::zip`.
Copyright Louis Dionne 2013-2022
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_ZIP_HPP
#define BOOST_HANA_ZIP_HPP
#include <boost/hana/fwd/zip.hpp>
#include <boost/hana/concept/sequence.hpp>
#include <boost/hana/config.hpp>
#include <boost/hana/core/dispatch.hpp>
#include <boost/hana/detail/fast_and.hpp>
#include <boost/hana/tuple.hpp>
#include <boost/hana/zip_with.hpp>
namespace boost { namespace hana {
//! @cond
template <typename Xs, typename ...Ys>
constexpr auto zip_t::operator()(Xs&& xs, Ys&& ...ys) const {
#ifndef BOOST_HANA_CONFIG_DISABLE_CONCEPT_CHECKS
static_assert(detail::fast_and<
hana::Sequence<Xs>::value, hana::Sequence<Ys>::value...
>::value,
"hana::zip(xs, ys...) requires 'xs' and 'ys...' to be Sequences");
#endif
return zip_impl<typename hana::tag_of<Xs>::type>::apply(
static_cast<Xs&&>(xs),
static_cast<Ys&&>(ys)...
);
}
//! @endcond
template <typename S, bool condition>
struct zip_impl<S, when<condition>> : default_ {
template <typename ...Xs>
static constexpr decltype(auto) apply(Xs&& ...xs) {
return hana::zip_with(hana::make_tuple, static_cast<Xs&&>(xs)...);
}
};
}} // end namespace boost::hana
#endif // !BOOST_HANA_ZIP_HPP
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