text: # /* **************************************************************************
  #  *                                                                          *
  #  *     (C) Copyright Paul Mensonides 2003.
  #  *     (C) Copyright Edward Diener 2014.
  #  *     Distributed under the Boost Software License, Version 1.0. (See
  #  *     accompanying file LICENSE_1_0.txt or copy at
  #  *     http://www.boost.org/LICENSE_1_0.txt)
  #  *                                                                          *
  #  ************************************************************************** */
  #
  # /* See http://www.boost.org for most recent version. */
  #
  # ifndef BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP
  # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP
  #
  # include <lib/preprocessor/config/config.hpp>
  #
  # if BOOST_PP_VARIADICS
  #
  # include <lib/preprocessor/facilities/is_empty_variadic.hpp>
  #
  # else
  #
  # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
  # include <lib/preprocessor/tuple/elem.hpp>
  # include <lib/preprocessor/facilities/identity.hpp>
  # else
  # include <lib/preprocessor/cat.hpp>
  # include <lib/preprocessor/detail/split.hpp>
  # endif
  #
  # /* BOOST_PP_IS_EMPTY */
  #
  # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
  #    define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(x BOOST_PP_IS_EMPTY_HELPER)
  #    define BOOST_PP_IS_EMPTY_I(contents) BOOST_PP_TUPLE_ELEM(2, 1, (BOOST_PP_IS_EMPTY_DEF_ ## contents()))
  #    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 1, BOOST_PP_IDENTITY(1)
  #    define BOOST_PP_IS_EMPTY_HELPER() , 0
  # else
  #    if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
  #        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I(BOOST_PP_IS_EMPTY_HELPER x ())
  #        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)))
  #        define BOOST_PP_IS_EMPTY_II(id) id
  #    else
  #        define BOOST_PP_IS_EMPTY(x) BOOST_PP_IS_EMPTY_I((BOOST_PP_IS_EMPTY_HELPER x ()))
  #        define BOOST_PP_IS_EMPTY_I(par) BOOST_PP_IS_EMPTY_II ## par
  #        define BOOST_PP_IS_EMPTY_II(test) BOOST_PP_SPLIT(0, BOOST_PP_CAT(BOOST_PP_IS_EMPTY_DEF_, test))
  #    endif
  #    define BOOST_PP_IS_EMPTY_HELPER() 1
  #    define BOOST_PP_IS_EMPTY_DEF_1 1, BOOST_PP_NIL
  #    define BOOST_PP_IS_EMPTY_DEF_BOOST_PP_IS_EMPTY_HELPER 0, BOOST_PP_NIL
  # endif
  #
  # endif /* BOOST_PP_VARIADICS */
  #
  # endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_HPP */
  