ceph/src/boost/libs/hana/include/boost/hana/concept/sequence.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::Sequence`.
   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_CONCEPT_SEQUENCE_HPP
  11 #define BOOST_HANA_CONCEPT_SEQUENCE_HPP
  12
  13 #include <boost/hana/fwd/concept/sequence.hpp>
  14
  15 #include <boost/hana/config.hpp>
  16 #include <boost/hana/core/tag_of.hpp>
  17 #include <boost/hana/core/when.hpp>
  18
  19
  20 BOOST_HANA_NAMESPACE_BEGIN
  21     namespace detail {
  22         template <typename S, typename Tag = typename hana::tag_of<S>::type>
  23         struct sequence_dispatch {
  24             static constexpr bool value = hana::Sequence<Tag>::value;
  25         };
  26
  27         template <typename S>
  28         struct sequence_dispatch<S, S> {
  29             static constexpr bool value = false;
  30         };
  31     }
  32
  33     //! @cond
  34     template <typename S, bool condition>
  35     struct Sequence<S, when<condition>>
  36         : detail::sequence_dispatch<S>
  37     { };
  38     //! @endcond
  39 BOOST_HANA_NAMESPACE_END
  40
  41 #endif // !BOOST_HANA_CONCEPT_SEQUENCE_HPP