williamr@2: # /* Copyright (C) 2001
williamr@2: #  * Housemarque Oy
williamr@2: #  * http://www.housemarque.com
williamr@2: #  *
williamr@2: #  * Distributed under the Boost Software License, Version 1.0. (See
williamr@2: #  * accompanying file LICENSE_1_0.txt or copy at
williamr@2: #  * http://www.boost.org/LICENSE_1_0.txt)
williamr@2: #  */
williamr@2: #
williamr@2: # /* Revised by Paul Mensonides (2002) */
williamr@2: #
williamr@2: # /* See http://www.boost.org for most recent version. */
williamr@2: #
williamr@2: # ifndef BOOST_PREPROCESSOR_ARITHMETIC_SUB_HPP
williamr@2: # define BOOST_PREPROCESSOR_ARITHMETIC_SUB_HPP
williamr@2: #
williamr@2: # include <boost/preprocessor/arithmetic/dec.hpp>
williamr@2: # include <boost/preprocessor/config/config.hpp>
williamr@2: # include <boost/preprocessor/control/while.hpp>
williamr@2: # include <boost/preprocessor/tuple/elem.hpp>
williamr@2: #
williamr@2: # /* BOOST_PP_SUB */
williamr@2: #
williamr@2: # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
williamr@2: #    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)))
williamr@2: # else
williamr@2: #    define BOOST_PP_SUB(x, y) BOOST_PP_SUB_I(x, y)
williamr@2: #    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)))
williamr@2: # endif
williamr@2: #
williamr@2: # define BOOST_PP_SUB_P(d, xy) BOOST_PP_TUPLE_ELEM(2, 1, xy)
williamr@2: #
williamr@2: # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
williamr@2: #    define BOOST_PP_SUB_O(d, xy) BOOST_PP_SUB_O_I xy
williamr@2: # else
williamr@2: #    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))
williamr@2: # endif
williamr@2: #
williamr@2: # define BOOST_PP_SUB_O_I(x, y) (BOOST_PP_DEC(x), BOOST_PP_DEC(y))
williamr@2: #
williamr@2: # /* BOOST_PP_SUB_D */
williamr@2: #
williamr@2: # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
williamr@2: #    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)))
williamr@2: # else
williamr@2: #    define BOOST_PP_SUB_D(d, x, y) BOOST_PP_SUB_D_I(d, x, y)
williamr@2: #    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)))
williamr@2: # endif
williamr@2: #
williamr@2: # endif