ceph/src/boost/libs/vmd/include/boost/vmd/tuple/is_vmd_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_IS_VMD_TUPLE_HPP)
   8 #define BOOST_VMD_IS_VMD_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/vmd/identity.hpp>
  16 #include <boost/vmd/is_empty.hpp>
  17 #include <boost/vmd/is_tuple.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_IS_VMD_TUPLE(sequence)
  29
  30     \brief Determines if a sequence is a VMD tuple.
  31
  32     The macro checks that the sequence is a VMD tuple.
  33     A VMD tuple, which may be a Boost PP tuple or emptiness, is a superset of a Boost PP tuple.
  34     It returns 1 if it is a VMD tuple, else if returns 0.
  35
  36     sequence = a possible Boost PP tuple
  37
  38     returns = 1 if it a VMD tuple, else returns 0.
  39
  40 */
  41
  42 #define BOOST_VMD_IS_VMD_TUPLE(sequence) \
  43     BOOST_VMD_IDENTITY_RESULT \
  44         ( \
  45         BOOST_PP_IIF \
  46             ( \
  47             BOOST_VMD_IS_EMPTY(sequence), \
  48             BOOST_VMD_IDENTITY(1), \
  49             BOOST_VMD_IS_TUPLE \
  50             ) \
  51         (sequence) \
  52         ) \
  53 /**/
  54
  55 #endif /* BOOST_PP_VARIADICS */
  56 #endif /* BOOST_VMD_IS_VMD_TUPLE_HPP */