preprocessor/tuple/pop_back.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 ">#
0011 # /* See http://www.boost.org for most recent version. */
0012 0013 ">#
0014 # ifndef BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP
0015 # define BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP
0016 0017 ">#
0018 # include <boost/preprocessor/config/config.hpp>
0019 # include <boost/preprocessor/array/pop_back.hpp>
0020 # include <boost/preprocessor/array/to_tuple.hpp>
0021 # include <boost/preprocessor/comparison/greater.hpp>
0022 # include <boost/preprocessor/control/iif.hpp>
0023 # include <boost/preprocessor/tuple/size.hpp>
0024 # include <boost/preprocessor/tuple/to_array.hpp>
0025 0026 ">#
0027 # /* BOOST_PP_TUPLE_POP_BACK */
0028 0029 ">#
0030 # define BOOST_PP_TUPLE_POP_BACK(tuple) \
0031     BOOST_PP_IIF \
0032         ( \
0033         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
0034         BOOST_PP_TUPLE_POP_BACK_EXEC, \
0035         BOOST_PP_TUPLE_POP_BACK_RETURN \
0036         ) \
0037     (tuple) \
0038 /**/
0039 0040 ">#
0041 # define BOOST_PP_TUPLE_POP_BACK_EXEC(tuple) \
0042     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_BACK(BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
0043 /**/
0044 0045 ">#
0046 # define BOOST_PP_TUPLE_POP_BACK_RETURN(tuple) tuple
0047 0048 ">#
0049 # /* BOOST_PP_TUPLE_POP_BACK_Z */
0050 0051 ">#
0052 # define BOOST_PP_TUPLE_POP_BACK_Z(z, tuple) \
0053     BOOST_PP_IIF \
0054         ( \
0055         BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \
0056         BOOST_PP_TUPLE_POP_BACK_Z_EXEC, \
0057         BOOST_PP_TUPLE_POP_BACK_Z_RETURN \
0058         ) \
0059     (z, tuple) \
0060 /**/
0061 0062 ">#
0063 # define BOOST_PP_TUPLE_POP_BACK_Z_EXEC(z, tuple) \
0064     BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_BACK_Z(z, BOOST_PP_TUPLE_TO_ARRAY(tuple))) \
0065 /**/
0066 0067 ">#
0068 # define BOOST_PP_TUPLE_POP_BACK_Z_RETURN(z, tuple) tuple
0069 0070 ">#
0071 # endif // BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP