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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_LIST_FIRST_N_HPP | |
15 | # define BOOST_PREPROCESSOR_LIST_FIRST_N_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/list/adt.hpp> | |
21 | # include <boost/preprocessor/list/reverse.hpp> | |
22 | # include <boost/preprocessor/tuple/elem.hpp> | |
23 | # include <boost/preprocessor/tuple/rem.hpp> | |
24 | # | |
25 | # /* BOOST_PP_LIST_FIRST_N */ | |
26 | # | |
27 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() | |
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)))) | |
29 | # else | |
30 | # define BOOST_PP_LIST_FIRST_N(count, list) BOOST_PP_LIST_FIRST_N_I(count, list) | |
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)))) | |
32 | # endif | |
33 | # | |
34 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() | |
35 | # define BOOST_PP_LIST_FIRST_N_P(d, data) BOOST_PP_TUPLE_ELEM(3, 0, data) | |
36 | # else | |
37 | # define BOOST_PP_LIST_FIRST_N_P(d, data) BOOST_PP_LIST_FIRST_N_P_I data | |
38 | # define BOOST_PP_LIST_FIRST_N_P_I(c, l, nl) c | |
39 | # endif | |
40 | # | |
41 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC() | |
42 | # define BOOST_PP_LIST_FIRST_N_O(d, data) BOOST_PP_LIST_FIRST_N_O_D data | |
43 | # else | |
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)) | |
45 | # endif | |
46 | # | |
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)) | |
48 | # | |
49 | # /* BOOST_PP_LIST_FIRST_N_D */ | |
50 | # | |
51 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() | |
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)))) | |
53 | # else | |
54 | # define BOOST_PP_LIST_FIRST_N_D(d, count, list) BOOST_PP_LIST_FIRST_N_D_I(d, count, list) | |
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)))) | |
56 | # endif | |
57 | # | |
58 | # endif |