preprocessor/tuple/pop_front.hpp

0001 # /* **************************************************************************
0002 #  *                                                                          *
0003 #  *     (C) Copyright Edward Diener 2013.
0004 #  *     Distributed under the Boost Software License, Version 1.0. (See
0005 #  *     accompanying file LICENSE_1_0.txt or copy at
0006 #  *     http://www.boost.org/LICENSE_1_0.txt)
0007 #  *                                                                          *
0008 #  ************************************************************************** */
0009 #
0010 # /* See http://www.boost.org for most recent version. */
0011 #
0012 # ifndef BOOST_PREPROCESSOR_TUPLE_POP_FRONT_HPP
0013 # define BOOST_PREPROCESSOR_TUPLE_POP_FRONT_HPP
0014 #
0015 # include <boost/preprocessor/config/config.hpp>
0016 # include <boost/preprocessor/array/pop_front.hpp>
0017 # include <boost/preprocessor/array/to_tuple.hpp>
0018 # include <boost/preprocessor/comparison/greater.hpp>
0019 # include <boost/preprocessor/control/iif.hpp>
0020 # include <boost/preprocessor/tuple/size.hpp>
0021 # include <boost/preprocessor/tuple/to_array.hpp>
0022 #
0023 #
0024 # /* BOOST_PP_TUPLE_POP_FRONT */
0025 #
0026 # define BOOST_PP_TUPLE_POP_FRONT(tuple) \
0027     BOOST_PP_IIF \
0028         ( \
0029         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
0030         BOOST_PP_TUPLE_POP_FRONT_EXEC, \
0031         BOOST_PP_TUPLE_POP_FRONT_RETURN \
0032         ) \
0033     (tuple) \
0034 /**/
0035 #
0036 # define BOOST_PP_TUPLE_POP_FRONT_EXEC(tuple) \
0037     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_FRONT(BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
0038 /**/
0039 #
0040 # define BOOST_PP_TUPLE_POP_FRONT_RETURN(tuple) tuple
0041 #
0042 # /* BOOST_PP_TUPLE_POP_FRONT_Z */
0043 #
0044 # define BOOST_PP_TUPLE_POP_FRONT_Z(z, tuple) \
0045     BOOST_PP_IIF \
0046         ( \
0047         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
0048         BOOST_PP_TUPLE_POP_FRONT_Z_EXEC, \
0049         BOOST_PP_TUPLE_POP_FRONT_Z_RETURN \
0050         ) \
0051     (z, tuple) \
0052 /**/
0053 #
0054 # define BOOST_PP_TUPLE_POP_FRONT_Z_EXEC(z, tuple) \
0055     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_FRONT_Z(z, BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
0056 /**/
0057 #
0058 # define BOOST_PP_TUPLE_POP_FRONT_Z_RETURN(z, tuple) tuple
0059 #
0060 # endif // BOOST_PREPROCESSOR_TUPLE_POP_FRONT_HPP