ceph/src/boost/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
  27 namespace boost { namespace fusion
  28 {
  29     struct vector_tag;
  30
  31     namespace vector_detail
  32     {
  33         template <std::size_t I, typename T>
  34         struct store;
  35
  36         template <std::size_t N, typename U>
  37         static inline BOOST_FUSION_GPU_ENABLED
  38         U value_at_impl(store<N, U> const volatile*);
  39     }
  40
  41     namespace extension
  42     {
  43         template <typename Tag>
  44         struct value_at_impl;
  45
  46         template <>
  47         struct value_at_impl<vector_tag>
  48         {
  49             template <typename Sequence, typename N>
  50             struct apply
  51             {
  52                 typedef
  53                     decltype(vector_detail::value_at_impl<N::value>(boost::declval<Sequence*>()))
  54                 type;
  55             };
  56         };
  57     }
  58 }}
  59
  60 #endif
  61 #endif
  62