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1 | # /* ************************************************************************** |
2 | # * * | |
3 | # * (C) Copyright Paul Mensonides 2002. | |
4 | # * Distributed under the Boost Software License, Version 1.0. (See | |
5 | # * accompanying file LICENSE_1_0.txt or copy at | |
6 | # * http://www.boost.org/LICENSE_1_0.txt) | |
7 | # * * | |
8 | # ************************************************************************** */ | |
9 | # | |
10 | # /* See http://www.boost.org for most recent version. */ | |
11 | # | |
12 | # ifndef BOOST_PREPROCESSOR_SEQ_FIRST_N_HPP | |
13 | # define BOOST_PREPROCESSOR_SEQ_FIRST_N_HPP | |
14 | # | |
15 | # include <boost/preprocessor/config/config.hpp> | |
16 | # include <boost/preprocessor/control/if.hpp> | |
17 | # include <boost/preprocessor/seq/detail/split.hpp> | |
18 | # include <boost/preprocessor/tuple/eat.hpp> | |
19 | # include <boost/preprocessor/tuple/elem.hpp> | |
20 | # | |
21 | # /* BOOST_PP_SEQ_FIRST_N */ | |
22 | # | |
23 | # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() | |
24 | # define BOOST_PP_SEQ_FIRST_N(n, seq) BOOST_PP_IF(n, BOOST_PP_TUPLE_ELEM, BOOST_PP_TUPLE_EAT_3)(2, 0, BOOST_PP_SEQ_SPLIT(n, seq (nil))) | |
25 | # else | |
26 | # define BOOST_PP_SEQ_FIRST_N(n, seq) BOOST_PP_SEQ_FIRST_N_I(n, seq) | |
27 | # define BOOST_PP_SEQ_FIRST_N_I(n, seq) BOOST_PP_IF(n, BOOST_PP_TUPLE_ELEM, BOOST_PP_TUPLE_EAT_3)(2, 0, BOOST_PP_SEQ_SPLIT(n, seq (nil))) | |
28 | # endif | |
29 | # | |
30 | # endif |