is_empty_variadic.hpp 1.7 KB

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  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 */