ceph/src/boost/libs/vmd/include/boost/vmd/detail/is_empty_tuple.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_DETAIL_IS_EMPTY_TUPLE_HPP)
   8 #define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_HPP
   9
  10 #include <boost/preprocessor/comparison/equal.hpp>
  11 #include <boost/preprocessor/control/iif.hpp>
  12 #include <boost/preprocessor/tuple/elem.hpp>
  13 #include <boost/preprocessor/tuple/size.hpp>
  14 #include <boost/vmd/identity.hpp>
  15 #include <boost/vmd/is_empty.hpp>
  16 #include <boost/vmd/is_tuple.hpp>
  17
  18 #define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_CEM(tuple) \
  19     BOOST_VMD_IS_EMPTY(BOOST_PP_TUPLE_ELEM(0,tuple)) \
  20 /**/
  21
  22 #define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE(tuple) \
  23     BOOST_VMD_IDENTITY_RESULT \
  24         ( \
  25         BOOST_PP_IIF \
  26             ( \
  27             BOOST_PP_EQUAL(BOOST_PP_TUPLE_SIZE(tuple),1), \
  28             BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_CEM, \
  29             BOOST_VMD_IDENTITY(0) \
  30             ) \
  31         (tuple) \
  32         ) \
  33 /**/
  34
  35 #define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE_D(d,tuple) \
  36     BOOST_VMD_IDENTITY_RESULT \
  37         ( \
  38         BOOST_PP_IIF \
  39             ( \
  40             BOOST_PP_EQUAL_D(d,BOOST_PP_TUPLE_SIZE(tuple),1), \
  41             BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_CEM, \
  42             BOOST_VMD_IDENTITY(0) \
  43             ) \
  44         (tuple) \
  45         ) \
  46 /**/
  47
  48 #define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE(tuple) \
  49     BOOST_VMD_IDENTITY_RESULT \
  50         ( \
  51         BOOST_PP_IIF \
  52             ( \
  53             BOOST_VMD_IS_TUPLE(tuple), \
  54             BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE, \
  55             BOOST_VMD_IDENTITY(0) \
  56             ) \
  57         (tuple) \
  58         ) \
  59 /**/
  60
  61 #define BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_D(d,tuple) \
  62     BOOST_VMD_IDENTITY_RESULT \
  63         ( \
  64         BOOST_PP_IIF \
  65             ( \
  66             BOOST_VMD_IS_TUPLE(tuple), \
  67             BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_SIZE_D, \
  68             BOOST_VMD_IDENTITY(0) \
  69             ) \
  70         (d,tuple) \
  71         ) \
  72 /**/
  73
  74 #endif /* BOOST_VMD_DETAIL_IS_EMPTY_TUPLE_HPP */