ceph/src/boost/libs/fusion/include/boost/fusion/container/map/detail/build_map.hpp

   1 /*=============================================================================
   2     Copyright (c) 2005-2013 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_FUSION_BUILD_MAP_02042013_1448)
   8 #define BOOST_FUSION_BUILD_MAP_02042013_1448
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/iterator/equal_to.hpp>
  12 #include <boost/fusion/iterator/next.hpp>
  13 #include <boost/fusion/iterator/value_of.hpp>
  14 #include <boost/fusion/iterator/deref.hpp>
  15 #include <boost/fusion/sequence/intrinsic/begin.hpp>
  16 #include <boost/fusion/sequence/intrinsic/end.hpp>
  17 #include <boost/fusion/container/map/map.hpp>
  18 #include <boost/fusion/algorithm/transformation/push_front.hpp>
  19
  20 namespace boost { namespace fusion { namespace detail
  21 {
  22     template <typename First, typename Last, bool is_assoc
  23       , bool is_empty = result_of::equal_to<First, Last>::value
  24     >
  25     struct build_map;
  26
  27     template <typename First, typename Last, bool is_assoc>
  28     struct build_map<First, Last, is_assoc, true>
  29     {
  30         typedef map<> type;
  31         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  32         static type
  33         call(First const&, Last const&)
  34         {
  35             return type();
  36         }
  37     };
  38
  39     template <typename T, typename Rest>
  40     struct push_front_map;
  41
  42     template <typename T, typename ...Rest>
  43     struct push_front_map<T, map<Rest...>>
  44     {
  45         typedef map<T, Rest...> type;
  46
  47         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  48         static type
  49         call(T const& first, map<Rest...> const& rest)
  50         {
  51             return type(push_front(rest, first));
  52         }
  53     };
  54
  55     template <typename First, typename Last, bool is_assoc>
  56     struct build_map<First, Last, is_assoc, false>
  57     {
  58         typedef
  59             build_map<typename result_of::next<First>::type, Last, is_assoc>
  60         next_build_map;
  61
  62         typedef push_front_map<
  63             typename pair_from<First, is_assoc>::type
  64           , typename next_build_map::type>
  65         push_front;
  66
  67         typedef typename push_front::type type;
  68
  69         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  70         static type
  71         call(First const& f, Last const& l)
  72         {
  73             return push_front::call(
  74                 pair_from<First, is_assoc>::call(f)
  75               , next_build_map::call(fusion::next(f), l));
  76         }
  77     };
  78 }}}
  79
  80 #endif