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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