# /* **************************************************************************

 #  *                                                                          *

 #  *     (C) Copyright Paul Mensonides 2002.

 #  *     Distributed under the Boost Software License, Version 1.0. (See

 #  *     accompanying file LICENSE_1_0.txt or copy at

 #  *     http://www.boost.org/LICENSE_1_0.txt)

 #  *                                                                          *

 #  ************************************************************************** */

 #

 # /* See http://www.boost.org for most recent version. */

 #

 # ifndef BOOST_PREPROCESSOR_SEQ_CAT_HPP

 # define BOOST_PREPROCESSOR_SEQ_CAT_HPP

 #

 # include <boost/preprocessor/arithmetic/dec.hpp>

 # include <boost/preprocessor/config/config.hpp>

 # include <boost/preprocessor/control/if.hpp>

 # include <boost/preprocessor/seq/fold_left.hpp>

 # include <boost/preprocessor/seq/seq.hpp>

 # include <boost/preprocessor/seq/size.hpp>

 # include <boost/preprocessor/tuple/eat.hpp>

 #

 # /* BOOST_PP_SEQ_CAT */

 #

 # define BOOST_PP_SEQ_CAT(seq) \

     BOOST_PP_IF( \

         BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \

         BOOST_PP_SEQ_CAT_I, \

         BOOST_PP_SEQ_HEAD(seq) BOOST_PP_TUPLE_EAT_1 \

     )(seq) \

     /**/

 # 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))

 #

 # define BOOST_PP_SEQ_CAT_O(s, st, elem) BOOST_PP_SEQ_CAT_O_I(st, elem)

 # define BOOST_PP_SEQ_CAT_O_I(a, b) a ## b

 #

 # /* BOOST_PP_SEQ_CAT_S */

 #

 # define BOOST_PP_SEQ_CAT_S(s, seq) \

     BOOST_PP_IF( \

         BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \

         BOOST_PP_SEQ_CAT_S_I, \

         BOOST_PP_SEQ_HEAD(seq) BOOST_PP_TUPLE_EAT_2 \

     )(s, seq) \

     /**/

 # define BOOST_PP_SEQ_CAT_S_I(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))

 #

 # endif