ceph/src/boost/libs/vmd/include/boost/vmd/is_empty_list.hpp

   1
   2 //  (C) Copyright Edward Diener 2011-2015
   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_EMPTY_LIST_HPP)
   8 #define BOOST_VMD_IS_EMPTY_LIST_HPP
   9
  10 #include <boost/vmd/detail/setup.hpp>
  11
  12 #if BOOST_PP_VARIADICS
  13
  14 #include <boost/vmd/detail/is_list.hpp>
  15
  16 /*
  17
  18   The succeeding comments in this file are in doxygen format.
  19
  20 */
  21
  22 /** \file
  23 */
  24
  25 /** \def BOOST_VMD_IS_EMPTY_LIST(sequence)
  26
  27     \brief Tests whether a sequence is an empty Boost PP list.
  28
  29     An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'.
  30     This identifier also serves as a list terminator for a non-empty list.
  31
  32     sequence = a preprocessor parameter
  33
  34     returns = 1 if the sequence is an empty Boost PP list
  35               0 if it is not.
  36
  37     The macro will generate a preprocessing error if the input
  38     as an empty list marker, instead of being an identifier, is
  39     a preprocessor token which VMD cannot parse, as in the
  40     example '&BOOST_PP_NIL'.
  41
  42 */
  43
  44 #define BOOST_VMD_IS_EMPTY_LIST(sequence) \
  45     BOOST_VMD_DETAIL_IS_LIST_IS_EMPTY_LIST_PROCESS(sequence) \
  46 /**/
  47
  48 /** \def BOOST_VMD_IS_EMPTY_LIST_D(d,sequence)
  49
  50     \brief Tests whether a sequence is an empty Boost PP list. Re-entrant version.
  51
  52     An empty Boost PP list consists of the single identifier 'BOOST_PP_NIL'.
  53     This identifier also serves as a list terminator for a non-empty list.
  54
  55     d        = The next available BOOST_PP_WHILE iteration
  56     sequence = a preprocessor parameter
  57
  58     returns = 1 if the sequence is an empty Boost PP list
  59               0 if it is not.
  60
  61     The macro will generate a preprocessing error if the input
  62     as an empty list marker, instead of being an identifier, is
  63     a preprocessor token which VMD cannot parse, as in the
  64     example '&BOOST_PP_NIL'.
  65
  66 */
  67
  68 #define BOOST_VMD_IS_EMPTY_LIST_D(d,sequence) \
  69     BOOST_VMD_DETAIL_IS_LIST_IS_EMPTY_LIST_PROCESS_D(d,sequence) \
  70 /**/
  71
  72 #endif /* BOOST_PP_VARIADICS */
  73 #endif /* BOOST_VMD_IS_EMPTY_LIST_HPP */