preprocessor/list/at.hpp

0001 # /* Copyright (C) 2001
0002 #  * Housemarque Oy
0003 #  * http://www.housemarque.com
0004 #  *
0005 #  * Distributed under the Boost Software License, Version 1.0. (See
0006 #  * accompanying file LICENSE_1_0.txt or copy at
0007 #  * http://www.boost.org/LICENSE_1_0.txt)
0008 #  */
0009 0010 ">#
0011 # /* Revised by Paul Mensonides (2002) */
0012 0013 ">#
0014 # /* See http://www.boost.org for most recent version. */
0015 0016 ">#
0017 # ifndef BOOST_PREPROCESSOR_LIST_AT_HPP
0018 # define BOOST_PREPROCESSOR_LIST_AT_HPP
0019 0020 ">#
0021 # include <boost/preprocessor/config/config.hpp>
0022 # include <boost/preprocessor/list/adt.hpp>
0023 # include <boost/preprocessor/list/rest_n.hpp>
0024 0025 ">#
0026 # /* BOOST_PP_LIST_AT */
0027 0028 ">#
0029 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
0030 #    define BOOST_PP_LIST_AT(list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N(index, list))
0031 # else
0032 #    define BOOST_PP_LIST_AT(list, index) BOOST_PP_LIST_AT_I(list, index)
0033 #    define BOOST_PP_LIST_AT_I(list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N(index, list))
0034 # endif
0035 0036 ">#
0037 # /* BOOST_PP_LIST_AT_D */
0038 0039 ">#
0040 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
0041 #    define BOOST_PP_LIST_AT_D(d, list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N_D(d, index, list))
0042 # else
0043 #    define BOOST_PP_LIST_AT_D(d, list, index) BOOST_PP_LIST_AT_D_I(d, list, index)
0044 #    define BOOST_PP_LIST_AT_D_I(d, list, index) BOOST_PP_LIST_FIRST(BOOST_PP_LIST_REST_N_D(d, index, list))
0045 # endif
0046 0047 ">#
0048 # endif