compiler/boost/preprocessor/facilities/is_empty_variadic.hpp

   1 # /* **************************************************************************
   2 #  *                                                                          *
   3 #  *     (C) Copyright Edward Diener 2014.
   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_VARIADIC_HPP
  13 # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP
  14 #
  15 # include <boost/preprocessor/config/config.hpp>
  16 #
  17 # if BOOST_PP_VARIADICS
  18 #
  19 # include <boost/preprocessor/punctuation/is_begin_parens.hpp>
  20 # include <boost/preprocessor/facilities/detail/is_empty.hpp>
  21 #
  22 #if BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400
  23 #
  24 #define BOOST_PP_IS_EMPTY(param) \
  25     BOOST_PP_DETAIL_IS_EMPTY_IIF \
  26       ( \
  27       BOOST_PP_IS_BEGIN_PARENS \
  28         ( \
  29         param \
  30         ) \
  31       ) \
  32       ( \
  33       BOOST_PP_IS_EMPTY_ZERO, \
  34       BOOST_PP_DETAIL_IS_EMPTY_PROCESS \
  35       ) \
  36     (param) \
  37 /**/
  38 #define BOOST_PP_IS_EMPTY_ZERO(param) 0
  39 # else
  40 #define BOOST_PP_IS_EMPTY(...) \
  41     BOOST_PP_DETAIL_IS_EMPTY_IIF \
  42       ( \
  43       BOOST_PP_IS_BEGIN_PARENS \
  44         ( \
  45         __VA_ARGS__ \
  46         ) \
  47       ) \
  48       ( \
  49       BOOST_PP_IS_EMPTY_ZERO, \
  50       BOOST_PP_DETAIL_IS_EMPTY_PROCESS \
  51       ) \
  52     (__VA_ARGS__) \
  53 /**/
  54 #define BOOST_PP_IS_EMPTY_ZERO(...) 0
  55 # endif /* BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 */
  56 # endif /* BOOST_PP_VARIADICS */
  57 # endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP */