source: NonGTP/Boost/boost/preprocessor/seq/first_n.hpp @ 857

Revision 857, 1.4 KB checked in by igarcia, 19 years ago (diff)
Line 
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
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