compiler/boost/preprocessor/facilities/detail/is_empty.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_DETAIL_IS_EMPTY_HPP
  13 #define BOOST_PREPROCESSOR_DETAIL_IS_EMPTY_HPP
  14
  15 #include <boost/preprocessor/punctuation/is_begin_parens.hpp>
  16
  17 #if BOOST_PP_VARIADICS_MSVC
  18
  19 # pragma warning(once:4002)
  20
  21 #define BOOST_PP_DETAIL_IS_EMPTY_IIF_0(t, b) b
  22 #define BOOST_PP_DETAIL_IS_EMPTY_IIF_1(t, b) t
  23
  24 #else
  25
  26 #define BOOST_PP_DETAIL_IS_EMPTY_IIF_0(t, ...) __VA_ARGS__
  27 #define BOOST_PP_DETAIL_IS_EMPTY_IIF_1(t, ...) t
  28
  29 #endif
  30
  31 #if BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400
  32
  33 #define BOOST_PP_DETAIL_IS_EMPTY_PROCESS(param) \
  34         BOOST_PP_IS_BEGIN_PARENS \
  35         ( \
  36         BOOST_PP_DETAIL_IS_EMPTY_NON_FUNCTION_C param () \
  37         ) \
  38 /**/
  39
  40 #else
  41
  42 #define BOOST_PP_DETAIL_IS_EMPTY_PROCESS(...) \
  43         BOOST_PP_IS_BEGIN_PARENS \
  44         ( \
  45         BOOST_PP_DETAIL_IS_EMPTY_NON_FUNCTION_C __VA_ARGS__ () \
  46         ) \
  47 /**/
  48
  49 #endif
  50
  51 #define BOOST_PP_DETAIL_IS_EMPTY_PRIMITIVE_CAT(a, b) a ## b
  52 #define BOOST_PP_DETAIL_IS_EMPTY_IIF(bit) BOOST_PP_DETAIL_IS_EMPTY_PRIMITIVE_CAT(BOOST_PP_DETAIL_IS_EMPTY_IIF_,bit)
  53 #define BOOST_PP_DETAIL_IS_EMPTY_NON_FUNCTION_C(...) ()
  54
  55 #endif /* BOOST_PREPROCESSOR_DETAIL_IS_EMPTY_HPP */