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 51