ceph/src/boost/boost/preprocessor/tuple/pop_back.hpp

   1 # /* **************************************************************************
   2 #  *                                                                          *
   3 #  *     (C) Copyright Edward Diener 2013.
   4 #  *     Distributed under the Boost Software License, Version 1.0. (See
   5 #  *     accompanying file LICENSE_1_0.txt or copy at
   6 #  *     http://www.boost.org/LICENSE_1_0.txt)
   7 #  *                                                                          *
   8 #  ************************************************************************** */
   9 #
  10 # /* See http://www.boost.org for most recent version. */
  11 #
  12 # ifndef BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP
  13 # define BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP
  14 #
  15 # include <boost/preprocessor/config/config.hpp>
  16 # include <boost/preprocessor/array/pop_back.hpp>
  17 # include <boost/preprocessor/array/to_tuple.hpp>
  18 # include <boost/preprocessor/comparison/greater.hpp>
  19 # include <boost/preprocessor/control/iif.hpp>
  20 # include <boost/preprocessor/tuple/size.hpp>
  21 # include <boost/preprocessor/tuple/to_array.hpp>
  22 #
  23 # /* BOOST_PP_TUPLE_POP_BACK */
  24 #
  25 # define BOOST_PP_TUPLE_POP_BACK(tuple) \
  26     BOOST_PP_IIF \
  27         ( \
  28         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
  29         BOOST_PP_TUPLE_POP_BACK_EXEC, \
  30         BOOST_PP_TUPLE_POP_BACK_RETURN \
  31         ) \
  32     (tuple) \
  33 /**/
  34 #
  35 # define BOOST_PP_TUPLE_POP_BACK_EXEC(tuple) \
  36     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_BACK(BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
  37 /**/
  38 #
  39 # define BOOST_PP_TUPLE_POP_BACK_RETURN(tuple) tuple
  40 #
  41 # /* BOOST_PP_TUPLE_POP_BACK_Z */
  42 #
  43 # define BOOST_PP_TUPLE_POP_BACK_Z(z, tuple) \
  44     BOOST_PP_IIF \
  45         ( \
  46         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
  47         BOOST_PP_TUPLE_POP_BACK_Z_EXEC, \
  48         BOOST_PP_TUPLE_POP_BACK_Z_RETURN \
  49         ) \
  50     (z, tuple) \
  51 /**/
  52 #
  53 # define BOOST_PP_TUPLE_POP_BACK_Z_EXEC(z, tuple) \
  54     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_BACK_Z(z, BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
  55 /**/
  56 #
  57 # define BOOST_PP_TUPLE_POP_BACK_Z_RETURN(z, tuple) tuple
  58 #
  59 # endif // BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP