sub.hpp 1.8 KB

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  1. # /* Copyright (C) 2001
  2. # * Housemarque Oy
  3. # * http://www.housemarque.com
  4. # *
  5. # * Distributed under the Boost Software License, Version 1.0. (See
  6. # * accompanying file LICENSE_1_0.txt or copy at
  7. # * http://www.boost.org/LICENSE_1_0.txt)
  8. # */
  9. #
  10. # /* Revised by Paul Mensonides (2002) */
  11. #
  12. # /* See http://www.boost.org for most recent version. */
  13. #
  14. # ifndef BOOST_PREPROCESSOR_ARITHMETIC_SUB_HPP
  15. # define BOOST_PREPROCESSOR_ARITHMETIC_SUB_HPP
  16. #
  17. # include <boost/preprocessor/arithmetic/dec.hpp>
  18. # include <boost/preprocessor/config/config.hpp>
  19. # include <boost/preprocessor/control/while.hpp>
  20. # include <boost/preprocessor/tuple/elem.hpp>
  21. #
  22. # /* BOOST_PP_SUB */
  23. #
  24. # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  25. # define BOOST_PP_SUB(x, y) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE(BOOST_PP_SUB_P, BOOST_PP_SUB_O, (x, y)))
  26. # else
  27. # define BOOST_PP_SUB(x, y) BOOST_PP_SUB_I(x, y)
  28. # define BOOST_PP_SUB_I(x, y) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE(BOOST_PP_SUB_P, BOOST_PP_SUB_O, (x, y)))
  29. # endif
  30. #
  31. # define BOOST_PP_SUB_P(d, xy) BOOST_PP_TUPLE_ELEM(2, 1, xy)
  32. #
  33. # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
  34. # define BOOST_PP_SUB_O(d, xy) BOOST_PP_SUB_O_I xy
  35. # else
  36. # define BOOST_PP_SUB_O(d, xy) BOOST_PP_SUB_O_I(BOOST_PP_TUPLE_ELEM(2, 0, xy), BOOST_PP_TUPLE_ELEM(2, 1, xy))
  37. # endif
  38. #
  39. # define BOOST_PP_SUB_O_I(x, y) (BOOST_PP_DEC(x), BOOST_PP_DEC(y))
  40. #
  41. # /* BOOST_PP_SUB_D */
  42. #
  43. # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  44. # define BOOST_PP_SUB_D(d, x, y) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE_ ## d(BOOST_PP_SUB_P, BOOST_PP_SUB_O, (x, y)))
  45. # else
  46. # define BOOST_PP_SUB_D(d, x, y) BOOST_PP_SUB_D_I(d, x, y)
  47. # define BOOST_PP_SUB_D_I(d, x, y) BOOST_PP_TUPLE_ELEM(2, 0, BOOST_PP_WHILE_ ## d(BOOST_PP_SUB_P, BOOST_PP_SUB_O, (x, y)))
  48. # endif
  49. #
  50. # endif