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

#  *                                                                          *

#  *     (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