1 # /* ************************************************************************** 2 # * * 3 # * (C) Copyright Edward Diener 2013. 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_TUPLE_POP_BACK_HPP 13 # define BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP 14 # 15 # include <boost/preprocessor/config/config.hpp> 16 # 17 # if BOOST_PP_VARIADICS 18 # 19 # include <boost/preprocessor/array/pop_back.hpp> 20 # include <boost/preprocessor/array/to_tuple.hpp> 21 # include <boost/preprocessor/comparison/greater.hpp> 22 # include <boost/preprocessor/control/iif.hpp> 23 # include <boost/preprocessor/tuple/size.hpp> 24 # include <boost/preprocessor/tuple/to_array.hpp> 25 # 26 # /* BOOST_PP_TUPLE_POP_BACK */ 27 # 28 # define BOOST_PP_TUPLE_POP_BACK(tuple) \ 29 BOOST_PP_IIF \ 30 ( \ 31 BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \ 32 BOOST_PP_TUPLE_POP_BACK_EXEC, \ 33 BOOST_PP_TUPLE_POP_BACK_RETURN \ 34 ) \ 35 (tuple) \ 36 /**/ 37 # 38 # define BOOST_PP_TUPLE_POP_BACK_EXEC(tuple) \ 39 BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_BACK(BOOST_PP_TUPLE_TO_ARRAY(tuple))) \ 40 /**/ 41 # 42 # define BOOST_PP_TUPLE_POP_BACK_RETURN(tuple) tuple 43 # 44 # /* BOOST_PP_TUPLE_POP_BACK_Z */ 45 # 46 # define BOOST_PP_TUPLE_POP_BACK_Z(z, tuple) \ 47 BOOST_PP_IIF \ 48 ( \ 49 BOOST_PP_GREATER(BOOST_PP_TUPLE_SIZE(tuple),1), \ 50 BOOST_PP_TUPLE_POP_BACK_Z_EXEC, \ 51 BOOST_PP_TUPLE_POP_BACK_Z_RETURN \ 52 ) \ 53 (z, tuple) \ 54 /**/ 55 # 56 # define BOOST_PP_TUPLE_POP_BACK_Z_EXEC(z, tuple) \ 57 BOOST_PP_ARRAY_TO_TUPLE(BOOST_PP_ARRAY_POP_BACK_Z(z, BOOST_PP_TUPLE_TO_ARRAY(tuple))) \ 58 /**/ 59 # 60 # define BOOST_PP_TUPLE_POP_BACK_Z_RETURN(z, tuple) tuple 61 # 62 # endif // BOOST_PP_VARIADICS 63 # 64 # endif // BOOST_PREPROCESSOR_TUPLE_POP_BACK_HPP 65