ceph/src/boost/libs/hana/include/boost/hana/zip.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::zip`.
   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_HPP
  11 #define BOOST_HANA_ZIP_HPP
  12
  13 #include <boost/hana/fwd/zip.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_with.hpp>
  21
  22
  23 BOOST_HANA_NAMESPACE_BEGIN
  24     //! @cond
  25     template <typename Xs, typename ...Ys>
  26     constexpr auto zip_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(xs, ys...) requires 'xs' and 'ys...' to be Sequences");
  32     #endif
  33
  34         return zip_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_impl<S, when<condition>> : default_ {
  43         template <typename ...Xs>
  44         static constexpr decltype(auto) apply(Xs&& ...xs) {
  45             return hana::zip_with(hana::make_tuple, static_cast<Xs&&>(xs)...);
  46         }
  47     };
  48 BOOST_HANA_NAMESPACE_END
  49
  50 #endif // !BOOST_HANA_ZIP_HPP