compiler/boost/preprocessor/facilities/is_empty.hpp

   1 # /* **************************************************************************
   2 #  *                                                                          *
   3 #  *     (C) Copyright Paul Mensonides 2003.
   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_FACILITIES_IS_EMPTY_HPP
  13 # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP
  14 #
  15 # include <boost/preprocessor/config/config.hpp>
  16 # include <boost/preprocessor/cat.hpp>
  17 # include <boost/preprocessor/tuple/elem.hpp>
  18 # include <boost/preprocessor/facilities/empty.hpp>
  19 # include <boost/preprocessor/detail/split.hpp>
  20 #
  21 # /* BOOST_PP_IS_EMPTY */
  22 #
  23 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
  24 #    define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(x BOOST_PP_IS_EMPTY_HELPER)
  25 #    define BOOST_PP_IS_EMPTY_I(contents) BOOST_PP_TUPLE_ELEM(2, 1, (BOOST_PP_IS_EMPTY_DEF_ ## contents()))
  26 #    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 1, 1 BOOST_PP_EMPTY
  27 #    define BOOST_PP_IS_EMPTY_HELPER() , 0
  28 # else
  29 #    if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
  30 #        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(BOOST_PP_IS_EMPTY_HELPER x ())
  31 #        define BOOST_PP_IS_EMPTY_I(test) BOOST_PP_IS_EMPTY_II(BOOST_PP_SPLIT(0, BOOST_PP_CAT(BOOST_PP_IS_EMPTY_DEF_, test)))
  32 #        define BOOST_PP_IS_EMPTY_II(id) id
  33 #    else
  34 #        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I((BOOST_PP_IS_EMPTY_HELPER x ()))
  35 #        define BOOST_PP_IS_EMPTY_I(par) BOOST_PP_IS_EMPTY_II ## par
  36 #        define BOOST_PP_IS_EMPTY_II(test) BOOST_PP_SPLIT(0, BOOST_PP_CAT(BOOST_PP_IS_EMPTY_DEF_, test))
  37 #    endif
  38 #    define BOOST_PP_IS_EMPTY_HELPER() 1
  39 #    define BOOST_PP_IS_EMPTY_DEF_1 1, BOOST_PP_NIL
  40 #    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 0, BOOST_PP_NIL
  41 # endif
  42 #
  43 # endif