preprocessor/seq/cat.hpp

0001 # /* **************************************************************************
0002 #  *                                                                          *
0003 #  *     (C) Copyright Paul Mensonides 2002.
0004 #  *     Distributed under the Boost Software License, Version 1.0. (See
0005 #  *     accompanying file LICENSE_1_0.txt or copy at
0006 #  *     http://www.boost.org/LICENSE_1_0.txt)
0007 #  *                                                                          *
0008 #  ************************************************************************** */
0009 #
0010 # /* See http://www.boost.org for most recent version. */
0011 #
0012 # ifndef BOOST_PREPROCESSOR_SEQ_CAT_HPP
0013 # define BOOST_PREPROCESSOR_SEQ_CAT_HPP
0014 #
0015 # include <boost/preprocessor/arithmetic/dec.hpp>
0016 # include <boost/preprocessor/config/config.hpp>
0017 # include <boost/preprocessor/control/if.hpp>
0018 # include <boost/preprocessor/seq/fold_left.hpp>
0019 # include <boost/preprocessor/seq/seq.hpp>
0020 # include <boost/preprocessor/seq/size.hpp>
0021 # include <boost/preprocessor/tuple/eat.hpp>
0022 #
0023 # /* BOOST_PP_SEQ_CAT */
0024 #
0025 # define BOOST_PP_SEQ_CAT(seq) \
0026     BOOST_PP_IF( \
0027         BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \
0028         BOOST_PP_SEQ_CAT_I, \
0029         BOOST_PP_SEQ_HEAD \
0030     )(seq) \
0031     /**/
0032 # define BOOST_PP_SEQ_CAT_I(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))
0033 #
0034 # define BOOST_PP_SEQ_CAT_O(s, st, elem) BOOST_PP_SEQ_CAT_O_I(st, elem)
0035 # define BOOST_PP_SEQ_CAT_O_I(a, b) a ## b
0036 #
0037 # /* BOOST_PP_SEQ_CAT_S */
0038 #
0039 # define BOOST_PP_SEQ_CAT_S(s, seq) \
0040     BOOST_PP_IF( \
0041         BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \
0042         BOOST_PP_SEQ_CAT_S_I_A, \
0043         BOOST_PP_SEQ_CAT_S_I_B \
0044     )(s, seq) \
0045     /**/
0046 # define BOOST_PP_SEQ_CAT_S_I_A(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))
0047 # define BOOST_PP_SEQ_CAT_S_I_B(s, seq) BOOST_PP_SEQ_HEAD(seq)
0048 #
0049 # endif