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 |
59 | |