ceph/src/boost/boost/vmd/list/to_tuple.hpp

   1
   2 //  (C) Copyright Edward Diener 2015
   3 //  Use, modification and distribution are subject to the Boost Software License,
   4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 //  http://www.boost.org/LICENSE_1_0.txt).
   6
   7 #if !defined(BOOST_VMD_LIST_TO_TUPLE_HPP)
   8 #define BOOST_VMD_LIST_TO_TUPLE_HPP
   9
  10 #include <boost/vmd/detail/setup.hpp>
  11
  12 #if BOOST_PP_VARIADICS
  13
  14 #include <boost/preprocessor/control/iif.hpp>
  15 #include <boost/preprocessor/list/to_tuple.hpp>
  16 #include <boost/vmd/empty.hpp>
  17 #include <boost/vmd/is_empty_list.hpp>
  18
  19 /*
  20
  21   The succeeding comments in this file are in doxygen format.
  22
  23 */
  24
  25 /** \file
  26 */
  27
  28 /** \def BOOST_VMD_LIST_TO_TUPLE(list)
  29
  30     \brief converts a list to a tuple.
  31
  32     list = list to be converted.
  33
  34     If the list is an empty list (BOOST_PP_NIL) it is converted to an empty tuple.
  35     Otherwise the list is converted to a tuple with the same number of elements as the list.
  36 */
  37
  38 #define BOOST_VMD_LIST_TO_TUPLE(list) \
  39     BOOST_PP_IIF \
  40         ( \
  41         BOOST_VMD_IS_EMPTY_LIST(list), \
  42         BOOST_VMD_EMPTY, \
  43         BOOST_PP_LIST_TO_TUPLE \
  44         ) \
  45     (list) \
  46 /**/
  47
  48 #endif /* BOOST_PP_VARIADICS */
  49 #endif /* BOOST_VMD_LIST_TO_TUPLE_HPP */