ceph/src/boost/boost/fusion/adapted/boost_tuple/detail/build_cons.hpp

   1 /*=============================================================================
   2     Copyright (c) 2012-2014 Kohei Takahashi
   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_CONS_10172012_0130)
   8 #define BOOST_FUSION_BUILD_CONS_10172012_0130
   9
  10 #include <boost/tuple/tuple.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
  16 namespace boost { namespace fusion { namespace detail
  17 {
  18     template <
  19         typename First
  20       , typename Last
  21       , bool is_empty = result_of::equal_to<First, Last>::value>
  22     struct build_tuple_cons;
  23
  24     template <typename First, typename Last>
  25     struct build_tuple_cons<First, Last, true>
  26     {
  27         typedef boost::tuples::null_type type;
  28
  29         BOOST_FUSION_GPU_ENABLED
  30         static type
  31         call(First const&, Last const&)
  32         {
  33             return type();
  34         }
  35     };
  36
  37     template <typename First, typename Last>
  38     struct build_tuple_cons<First, Last, false>
  39     {
  40         typedef
  41             build_tuple_cons<typename result_of::next<First>::type, Last>
  42         next_build_tuple_cons;
  43
  44         typedef boost::tuples::cons<
  45             typename result_of::value_of<First>::type
  46           , typename next_build_tuple_cons::type>
  47         type;
  48
  49         BOOST_FUSION_GPU_ENABLED
  50         static type
  51         call(First const& f, Last const& l)
  52         {
  53             typename result_of::value_of<First>::type v = *f;
  54             return type(v, next_build_tuple_cons::call(fusion::next(f), l));
  55         }
  56     };
  57 }}}
  58
  59 #endif