boost/boost/preprocessor/facilities/is_empty_or_1.hpp

   1 # /* **************************************************************************\r
   2 #  *                                                                          *\r
   3 #  *     (C) Copyright Paul Mensonides 2003.\r
   4 #  *     Distributed under the Boost Software License, Version 1.0. (See\r
   5 #  *     accompanying file LICENSE_1_0.txt or copy at\r
   6 #  *     http://www.boost.org/LICENSE_1_0.txt)\r
   7 #  *                                                                          *\r
   8 #  ************************************************************************** */\r
   9 #\r
  10 # /* See http://www.boost.org for most recent version. */\r
  11 #\r
  12 # ifndef BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_OR_1_HPP\r
  13 # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_OR_1_HPP\r
  14 #\r
  15 # include <boost/preprocessor/control/iif.hpp>\r
  16 # include <boost/preprocessor/facilities/empty.hpp>\r
  17 # include <boost/preprocessor/facilities/is_1.hpp>\r
  18 # include <boost/preprocessor/facilities/is_empty.hpp>\r
  19 #\r
  20 # /* BOOST_PP_IS_EMPTY_OR_1 */\r
  21 #\r
  22 # define BOOST_PP_IS_EMPTY_OR_1(x) \\r
  23     BOOST_PP_IIF( \\r
  24         BOOST_PP_IS_EMPTY(x BOOST_PP_EMPTY()), \\r
  25         1 BOOST_PP_EMPTY, \\r
  26         BOOST_PP_IS_1 \\r
  27     )(x) \\r
  28     /**/\r
  29 #\r
  30 # endif\r