/*! @file Defines `boost::hana::zip_shortest`. @copyright Louis Dionne 2013-2016 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_SHORTEST_HPP #define BOOST_HANA_ZIP_SHORTEST_HPP #include <boost/hana/fwd/zip_shortest.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_shortest_with.hpp> BOOST_HANA_NAMESPACE_BEGIN //! @cond template <typename Xs, typename ...Ys> constexpr auto zip_shortest_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_shortest(xs, ys...) requires 'xs' and 'ys...' to be Sequences"); #endif return zip_shortest_impl<typename hana::tag_of<Xs>::type>::apply( static_cast<Xs&&>(xs), static_cast<Ys&&>(ys)... ); } //! @endcond template <typename S, bool condition> struct zip_shortest_impl<S, when<condition>> : default_ { template <typename ...Xs> static constexpr decltype(auto) apply(Xs&& ...xs) { return hana::zip_shortest_with(hana::make_tuple, static_cast<Xs&&>(xs)...); } }; BOOST_HANA_NAMESPACE_END #endif // !BOOST_HANA_ZIP_SHORTEST_HPP