ceph/src/boost/libs/fusion/include/boost/fusion/container/vector/detail/value_at_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 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 #ifndef FUSION_VALUE_AT_IMPL_16122014_1641
   8 #define FUSION_VALUE_AT_IMPL_16122014_1641
   9
  10 #include <boost/config.hpp>
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/fusion/container/vector/detail/config.hpp>
  13
  14 ///////////////////////////////////////////////////////////////////////////////
  15 // Without variadics, we will use the PP version
  16 ///////////////////////////////////////////////////////////////////////////////
  17 #if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
  18 # include <boost/fusion/container/vector/detail/cpp03/value_at_impl.hpp>
  19 #else
  20
  21 ///////////////////////////////////////////////////////////////////////////////
  22 // C++11 interface
  23 ///////////////////////////////////////////////////////////////////////////////
  24 #include <boost/fusion/container/vector/vector_fwd.hpp>
  25 #include <boost/type_traits/declval.hpp>
  26 #include <boost/type_traits/remove_cv.hpp>
  27
  28 namespace boost { namespace fusion
  29 {
  30     struct vector_tag;
  31
  32     namespace vector_detail
  33     {
  34         template <typename I, typename ...T>
  35         struct vector_data;
  36     }
  37
  38     namespace extension
  39     {
  40         template <typename Tag>
  41         struct value_at_impl;
  42
  43         template <>
  44         struct value_at_impl<vector_tag>
  45         {
  46             template <typename Sequence, typename N>
  47             struct apply
  48             {
  49                 typedef typename boost::remove_cv<Sequence>::type seq;
  50                 typedef typename mpl::identity<decltype(seq::template value_at_impl<N::value>(boost::declval<seq*>()))>::type::type type;
  51             };
  52         };
  53     }
  54 }}
  55
  56 #endif
  57 #endif
  58