compiler/boost/preprocessor/arithmetic/sub.hpp

   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