compiler/boost/preprocessor/facilities/is_empty.hpp

   1 # /* **************************************************************************
   2 #  *                                                                          *
   3 #  *     (C) Copyright Paul Mensonides 2003.
   4 #  *     (C) Copyright Edward Diener 2014.
   5 #  *     Distributed under the Boost Software License, Version 1.0. (See
   6 #  *     accompanying file LICENSE_1_0.txt or copy at
   7 #  *     http://www.boost.org/LICENSE_1_0.txt)
   8 #  *                                                                          *
   9 #  ************************************************************************** */
  10 #
  11 # /* See http://www.boost.org for most recent version. */
  12 #
  13 # ifndef BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP
  14 # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP
  15 #
  16 # include <boost/preprocessor/config/config.hpp>
  17 #
  18 # if BOOST_PP_VARIADICS
  19 #
  20 # include <boost/preprocessor/facilities/is_empty_variadic.hpp>
  21 #
  22 # else
  23 #
  24 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
  25 # include <boost/preprocessor/tuple/elem.hpp>
  26 # include <boost/preprocessor/facilities/identity.hpp>
  27 # else
  28 # include <boost/preprocessor/cat.hpp>
  29 # include <boost/preprocessor/detail/split.hpp>
  30 # endif
  31 #
  32 # /* BOOST_PP_IS_EMPTY */
  33 #
  34 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
  35 #    define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(x BOOST_PP_IS_EMPTY_HELPER)
  36 #    define BOOST_PP_IS_EMPTY_I(contents) BOOST_PP_TUPLE_ELEM(2, 1, (BOOST_PP_IS_EMPTY_DEF_ ## contents()))
  37 #    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 1, BOOST_PP_IDENTITY(1)
  38 #    define BOOST_PP_IS_EMPTY_HELPER() , 0
  39 # else
  40 #    if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
  41 #        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(BOOST_PP_IS_EMPTY_HELPER x ())
  42 #        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)))
  43 #        define BOOST_PP_IS_EMPTY_II(id) id
  44 #    else
  45 #        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I((BOOST_PP_IS_EMPTY_HELPER x ()))
  46 #        define BOOST_PP_IS_EMPTY_I(par) BOOST_PP_IS_EMPTY_II ## par
  47 #        define BOOST_PP_IS_EMPTY_II(test) BOOST_PP_SPLIT(0, BOOST_PP_CAT(BOOST_PP_IS_EMPTY_DEF_, test))
  48 #    endif
  49 #    define BOOST_PP_IS_EMPTY_HELPER() 1
  50 #    define BOOST_PP_IS_EMPTY_DEF_1 1, BOOST_PP_NIL
  51 #    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 0, BOOST_PP_NIL
  52 # endif
  53 #
  54 # endif /* BOOST_PP_VARIADICS */
  55 #
  56 # endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP */