compiler/boost/preprocessor/list/at.hpp

   1 # /* Copyright (C) 2001
   2 #  * Housemarque Oy
   3 #  * http://www.housemarque.com
   4 #  *
   5 #  * Distributed under the Boost Software License, Version 1.0. (See
   6 #  * accompanying file LICENSE_1_0.txt or copy at
   7 #  * http://www.boost.org/LICENSE_1_0.txt)
   8 #  */
   9 #
  10 # /* Revised by Paul Mensonides (2002) */
  11 #
  12 # /* See http://www.boost.org for most recent version. */
  13 #
  14 # ifndef BOOST_PREPROCESSOR_LIST_AT_HPP
  15 # define BOOST_PREPROCESSOR_LIST_AT_HPP
  16 #
  17 # include <boost/preprocessor/config/config.hpp>
  18 # include <boost/preprocessor/list/adt.hpp>
  19 # include <boost/preprocessor/list/rest_n.hpp>
  20 #
  21 # /* BOOST_PP_LIST_AT */
  22 #
  23 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  24 #    define BOOST_PP_LIST_AT(list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N(index, list))
  25 # else
  26 #    define BOOST_PP_LIST_AT(list, index) BOOST_PP_LIST_AT_I(list, index)
  27 #    define BOOST_PP_LIST_AT_I(list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N(index, list))
  28 # endif
  29 #
  30 # /* BOOST_PP_LIST_AT_D */
  31 #
  32 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
  33 #    define BOOST_PP_LIST_AT_D(d, list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N_D(d, index, list))
  34 # else
  35 #    define BOOST_PP_LIST_AT_D(d, list, index) BOOST_PP_LIST_AT_D_I(d, list, index)
  36 #    define BOOST_PP_LIST_AT_D_I(d, list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N_D(d, index, list))
  37 # endif
  38 #
  39 # endif