boost/preprocessor/seq/rest_n.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_REST_N_HPP
  13 # define BOOST_PREPROCESSOR_SEQ_REST_N_HPP
  14 #
  15 # include <boost/preprocessor/arithmetic/inc.hpp>
  16 # include <boost/preprocessor/comparison/not_equal.hpp>
  17 # include <boost/preprocessor/config/config.hpp>
  18 # include <boost/preprocessor/control/expr_iif.hpp>
  19 # include <boost/preprocessor/facilities/identity.hpp>
  20 # include <boost/preprocessor/logical/bitand.hpp>
  21 # include <boost/preprocessor/seq/detail/is_empty.hpp>
  22 # include <boost/preprocessor/seq/detail/split.hpp>
  23 # include <boost/preprocessor/tuple/elem.hpp>
  24 #
  25 # /* BOOST_PP_SEQ_REST_N */
  26 #
  27 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  28 #    define BOOST_PP_SEQ_REST_N(n, seq) BOOST_PP_SEQ_REST_N_DETAIL_EXEC(n, seq, BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq))
  29 # else
  30 #    define BOOST_PP_SEQ_REST_N(n, seq) BOOST_PP_SEQ_REST_N_I(n, seq)
  31 #    define BOOST_PP_SEQ_REST_N_I(n, seq) BOOST_PP_SEQ_REST_N_DETAIL_EXEC(n, seq, BOOST_PP_SEQ_DETAIL_EMPTY_SIZE(seq))
  32 # endif
  33 #
  34 #    define BOOST_PP_SEQ_REST_N_DETAIL_EXEC(n, seq, size) \
  35         BOOST_PP_EXPR_IIF \
  36             ( \
  37             BOOST_PP_BITAND \
  38                 ( \
  39                 BOOST_PP_SEQ_DETAIL_IS_NOT_EMPTY_SIZE(size), \
  40                 BOOST_PP_NOT_EQUAL(n,size) \
  41                 ), \
  42             BOOST_PP_TUPLE_ELEM(2, 1, BOOST_PP_SEQ_SPLIT(BOOST_PP_INC(n), BOOST_PP_IDENTITY( (nil) seq )))() \
  43             ) \
  44 /**/
  45 #
  46 # endif