[1022] | 1 | # /* Copyright (C) 2001 |
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| 2 | # * Housemarque Oy |
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| 3 | # * http://www.housemarque.com |
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| 4 | # * |
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| 5 | # * Distributed under the Boost Software License, Version 1.0. (See |
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| 6 | # * accompanying file LICENSE_1_0.txt or copy at |
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| 7 | # * http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | # */ |
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| 9 | # |
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| 10 | # /* Revised by Paul Mensonides (2002) */ |
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| 11 | # |
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| 12 | # /* See http://www.boost.org for most recent version. */ |
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| 13 | # |
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| 14 | # ifndef BOOST_PREPROCESSOR_LIST_FIRST_N_HPP |
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| 15 | # define BOOST_PREPROCESSOR_LIST_FIRST_N_HPP |
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| 16 | # |
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| 17 | # include <boost/preprocessor/arithmetic/dec.hpp> |
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| 18 | # include <boost/preprocessor/config/config.hpp> |
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| 19 | # include <boost/preprocessor/control/while.hpp> |
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| 20 | # include <boost/preprocessor/list/adt.hpp> |
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| 21 | # include <boost/preprocessor/list/reverse.hpp> |
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| 22 | # include <boost/preprocessor/tuple/elem.hpp> |
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| 23 | # include <boost/preprocessor/tuple/rem.hpp> |
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| 24 | # |
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| 25 | # /* BOOST_PP_LIST_FIRST_N */ |
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| 26 | # |
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| 27 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() |
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| 28 | # define BOOST_PP_LIST_FIRST_N(count, list) BOOST_PP_LIST_REVERSE(BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_WHILE(BOOST_PP_LIST_FIRST_N_P, BOOST_PP_LIST_FIRST_N_O, (count, list, BOOST_PP_NIL)))) |
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| 29 | # else |
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| 30 | # define BOOST_PP_LIST_FIRST_N(count, list) BOOST_PP_LIST_FIRST_N_I(count, list) |
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| 31 | # define BOOST_PP_LIST_FIRST_N_I(count, list) BOOST_PP_LIST_REVERSE(BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_WHILE(BOOST_PP_LIST_FIRST_N_P, BOOST_PP_LIST_FIRST_N_O, (count, list, BOOST_PP_NIL)))) |
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| 32 | # endif |
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| 33 | # |
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| 34 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() |
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| 35 | # define BOOST_PP_LIST_FIRST_N_P(d, data) BOOST_PP_TUPLE_ELEM(3, 0, data) |
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| 36 | # else |
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| 37 | # define BOOST_PP_LIST_FIRST_N_P(d, data) BOOST_PP_LIST_FIRST_N_P_I data |
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| 38 | # define BOOST_PP_LIST_FIRST_N_P_I(c, l, nl) c |
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| 39 | # endif |
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| 40 | # |
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| 41 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC() |
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| 42 | # define BOOST_PP_LIST_FIRST_N_O(d, data) BOOST_PP_LIST_FIRST_N_O_D data |
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| 43 | # else |
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| 44 | # define BOOST_PP_LIST_FIRST_N_O(d, data) BOOST_PP_LIST_FIRST_N_O_D(BOOST_PP_TUPLE_ELEM(3, 0, data), BOOST_PP_TUPLE_ELEM(3, 1, data), BOOST_PP_TUPLE_ELEM(3, 2, data)) |
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| 45 | # endif |
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| 46 | # |
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| 47 | # define BOOST_PP_LIST_FIRST_N_O_D(c, l, nl) (BOOST_PP_DEC(c), BOOST_PP_LIST_REST(l), (BOOST_PP_LIST_FIRST(l), nl)) |
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| 48 | # |
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| 49 | # /* BOOST_PP_LIST_FIRST_N_D */ |
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| 50 | # |
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| 51 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() |
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| 52 | # define BOOST_PP_LIST_FIRST_N_D(d, count, list) BOOST_PP_LIST_REVERSE_D(d, BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_WHILE_ ## d(BOOST_PP_LIST_FIRST_N_P, BOOST_PP_LIST_FIRST_N_O, (count, list, BOOST_PP_NIL)))) |
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| 53 | # else |
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| 54 | # define BOOST_PP_LIST_FIRST_N_D(d, count, list) BOOST_PP_LIST_FIRST_N_D_I(d, count, list) |
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| 55 | # define BOOST_PP_LIST_FIRST_N_D_I(d, count, list) BOOST_PP_LIST_REVERSE_D(d, BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_WHILE_ ## d(BOOST_PP_LIST_FIRST_N_P, BOOST_PP_LIST_FIRST_N_O, (count, list, BOOST_PP_NIL)))) |
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| 56 | # endif |
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| 57 | # |
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| 58 | # endif |
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