boost/preprocessor/seq/cat.hpp

   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_CAT_HPP
  13 # define BOOST_PREPROCESSOR_SEQ_CAT_HPP
  14 #
  15 # include <boost/preprocessor/arithmetic/dec.hpp>
  16 # include <boost/preprocessor/config/config.hpp>
  17 # include <boost/preprocessor/control/if.hpp>
  18 # include <boost/preprocessor/seq/fold_left.hpp>
  19 # include <boost/preprocessor/seq/seq.hpp>
  20 # include <boost/preprocessor/seq/size.hpp>
  21 # include <boost/preprocessor/tuple/eat.hpp>
  22 #
  23 # /* BOOST_PP_SEQ_CAT */
  24 #
  25 # define BOOST_PP_SEQ_CAT(seq) \
  26     BOOST_PP_IF( \
  27         BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \
  28         BOOST_PP_SEQ_CAT_I, \
  29         BOOST_PP_SEQ_HEAD \
  30     )(seq) \
  31     /**/
  32 # 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))
  33 #
  34 # define BOOST_PP_SEQ_CAT_O(s, st, elem) BOOST_PP_SEQ_CAT_O_I(st, elem)
  35 # define BOOST_PP_SEQ_CAT_O_I(a, b) a ## b
  36 #
  37 # /* BOOST_PP_SEQ_CAT_S */
  38 #
  39 # define BOOST_PP_SEQ_CAT_S(s, seq) \
  40     BOOST_PP_IF( \
  41         BOOST_PP_DEC(BOOST_PP_SEQ_SIZE(seq)), \
  42         BOOST_PP_SEQ_CAT_S_I_A, \
  43         BOOST_PP_SEQ_CAT_S_I_B \
  44     )(s, seq) \
  45     /**/
  46 # 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))
  47 # define BOOST_PP_SEQ_CAT_S_I_B(s, seq) BOOST_PP_SEQ_HEAD(seq)
  48 #
  49 # endif