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