ceph/src/boost/libs/compute/include/boost/compute/detail/mpl_vector_to_tuple.hpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013 Kyle Lutz <kyle.r.lutz@gmail.com>
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 // See http://boostorg.github.com/compute for more information.
   9 //---------------------------------------------------------------------------//
  10
  11 #ifndef BOOST_COMPUTE_DETAIL_MPL_VECTOR_TO_TUPLE_HPP
  12 #define BOOST_COMPUTE_DETAIL_MPL_VECTOR_TO_TUPLE_HPP
  13
  14 #include <boost/mpl/copy.hpp>
  15 #include <boost/mpl/vector.hpp>
  16 #include <boost/tuple/tuple.hpp>
  17 #include <boost/fusion/include/mpl.hpp>
  18 #include <boost/fusion/adapted/boost_tuple.hpp>
  19 #include <boost/preprocessor/repetition.hpp>
  20
  21 #include <boost/compute/config.hpp>
  22
  23 namespace boost {
  24 namespace compute {
  25 namespace detail {
  26
  27 namespace mpl = boost::mpl;
  28
  29 template<class Vector, size_t N>
  30 struct mpl_vector_to_tuple_impl;
  31
  32 #define BOOST_COMPUTE_PRINT_ELEM(z, n, unused)                                 \
  33     typename mpl::at_c<Vector, n>::type
  34
  35 #define BOOST_COMPUTE_VEC2TUP(z, n, unused)                                    \
  36 template<class Vector>                                                         \
  37 struct mpl_vector_to_tuple_impl<Vector, n>                                     \
  38 {                                                                              \
  39     typedef typename                                                           \
  40         boost::tuple<                                                          \
  41             BOOST_PP_ENUM(n, BOOST_COMPUTE_PRINT_ELEM, ~)                      \
  42         > type;                                                                \
  43 };
  44
  45 BOOST_PP_REPEAT_FROM_TO(1, BOOST_COMPUTE_MAX_ARITY, BOOST_COMPUTE_VEC2TUP, ~)
  46
  47 #undef BOOST_COMPUTE_VEC2TUP
  48 #undef BOOST_COMPUTE_PRINT_ELEM
  49
  50 // meta-function which converts a mpl::vector to a boost::tuple
  51 template<class Vector>
  52 struct mpl_vector_to_tuple
  53 {
  54     typedef typename
  55         mpl_vector_to_tuple_impl<
  56             Vector,
  57             mpl::size<Vector>::value
  58         >::type type;
  59 };
  60
  61 } // end detail namespace
  62 } // end compute namespace
  63 } // end boost namespace
  64
  65 #endif // BOOST_COMPUTE_DETAIL_MPL_VECTOR_TO_TUPLE_HPP