ceph/src/boost/libs/fusion/include/boost/fusion/container/list/detail/build_cons.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 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(FUSION_BUILD_CONS_09232005_1222)
   8 #define FUSION_BUILD_CONS_09232005_1222
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/container/list/cons.hpp>
  12 #include <boost/fusion/iterator/equal_to.hpp>
  13 #include <boost/fusion/iterator/next.hpp>
  14 #include <boost/fusion/iterator/value_of.hpp>
  15 #include <boost/fusion/iterator/deref.hpp>
  16
  17 namespace boost { namespace fusion { namespace detail
  18 {
  19     template <
  20         typename First
  21       , typename Last
  22       , bool is_empty = result_of::equal_to<First, Last>::value>
  23     struct build_cons;
  24
  25     template <typename First, typename Last>
  26     struct build_cons<First, Last, true>
  27     {
  28         typedef nil_ type;
  29
  30         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  31         static nil_
  32         call(First const&, Last const&)
  33         {
  34             return nil_();
  35         }
  36     };
  37
  38     template <typename First, typename Last>
  39     struct build_cons<First, Last, false>
  40     {
  41         typedef
  42             build_cons<typename result_of::next<First>::type, Last>
  43         next_build_cons;
  44
  45         typedef cons<
  46             typename result_of::value_of<First>::type
  47           , typename next_build_cons::type>
  48         type;
  49
  50         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  51         static type
  52         call(First const& f, Last const& l)
  53         {
  54             typename result_of::value_of<First>::type v = *f;
  55             return type(v, next_build_cons::call(fusion::next(f), l));
  56         }
  57     };
  58
  59 }}}
  60
  61 #endif