compiler/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/config/config.hpp>
  16 # include <boost/preprocessor/seq/fold_left.hpp>
  17 # include <boost/preprocessor/seq/seq.hpp>
  18 #
  19 # /* BOOST_PP_SEQ_CAT */
  20 #
  21 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  22 #    define BOOST_PP_SEQ_CAT(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))
  23 # else
  24 #    define BOOST_PP_SEQ_CAT(seq) BOOST_PP_SEQ_CAT_I(seq)
  25 #    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))
  26 # endif
  27 #
  28 # define BOOST_PP_SEQ_CAT_O(s, st, elem) BOOST_PP_SEQ_CAT_O_I(st, elem)
  29 # define BOOST_PP_SEQ_CAT_O_I(a, b) a ## b
  30 #
  31 # /* BOOST_PP_SEQ_CAT_S */
  32 #
  33 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  34 #    define BOOST_PP_SEQ_CAT_S(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_CAT_O, BOOST_PP_SEQ_HEAD(seq), BOOST_PP_SEQ_TAIL(seq))
  35 # else
  36 #    define BOOST_PP_SEQ_CAT_S(s, seq) BOOST_PP_SEQ_CAT_S_I(s, seq)
  37 #    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))
  38 # endif
  39 #
  40 # endif