ceph/src/boost/libs/vmd/include/boost/vmd/tuple/to_array.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_TUPLE_TO_ARRAY_HPP)
   8 #define BOOST_VMD_TUPLE_TO_ARRAY_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/tuple/to_array.hpp>
  16 #include <boost/vmd/identity.hpp>
  17 #include <boost/vmd/is_empty.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_TUPLE_TO_ARRAY(tuple)
  29
  30     \brief converts a tuple to an array.
  31
  32     tuple = tuple to be converted.
  33
  34     If the tuple is an empty tuple it is converted to an array with 0 elements.
  35     Otherwise the tuple is converted to an array with the same number of elements as the tuple.
  36 */
  37
  38 #define BOOST_VMD_TUPLE_TO_ARRAY(tuple) \
  39     BOOST_VMD_IDENTITY_RESULT \
  40         ( \
  41         BOOST_PP_IIF \
  42             ( \
  43             BOOST_VMD_IS_EMPTY(tuple), \
  44             BOOST_VMD_IDENTITY((0,())), \
  45             BOOST_PP_TUPLE_TO_ARRAY \
  46             ) \
  47         (tuple) \
  48         ) \
  49 /**/
  50
  51 #endif /* BOOST_PP_VARIADICS */
  52 #endif /* BOOST_VMD_TUPLE_TO_ARRAY_HPP */