1 # /* ************************************************************************** 2 # * * 3 # * (C) Copyright Paul Mensonides 2002. 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_SEQ_FILTER_HPP 13 # define BOOST_PREPROCESSOR_SEQ_FILTER_HPP 14 # 15 # include <boost/preprocessor/config/config.hpp> 16 # include <boost/preprocessor/control/expr_if.hpp> 17 # include <boost/preprocessor/facilities/empty.hpp> 18 # include <boost/preprocessor/seq/fold_left.hpp> 19 # include <boost/preprocessor/seq/seq.hpp> 20 # include <boost/preprocessor/tuple/elem.hpp> 21 # include <boost/preprocessor/tuple/rem.hpp> 22 # 23 # /* BOOST_PP_SEQ_FILTER */ 24 # 25 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() 26 # define BOOST_PP_SEQ_FILTER(pred, data, seq) BOOST_PP_SEQ_TAIL(BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_FILTER_O, (pred, data, (nil)), seq))) 27 # else 28 # define BOOST_PP_SEQ_FILTER(pred, data, seq) BOOST_PP_SEQ_FILTER_I(pred, data, seq) 29 # define BOOST_PP_SEQ_FILTER_I(pred, data, seq) BOOST_PP_SEQ_TAIL(BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_FILTER_O, (pred, data, (nil)), seq))) 30 # endif 31 # 32 # if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_STRICT() 33 # define BOOST_PP_SEQ_FILTER_O(s, st, elem) BOOST_PP_SEQ_FILTER_O_IM(s, BOOST_PP_TUPLE_REM_3 st, elem) 34 # define BOOST_PP_SEQ_FILTER_O_IM(s, im, elem) BOOST_PP_SEQ_FILTER_O_I(s, im, elem) 35 # else 36 # define BOOST_PP_SEQ_FILTER_O(s, st, elem) BOOST_PP_SEQ_FILTER_O_I(s, BOOST_PP_TUPLE_ELEM(3, 0, st), BOOST_PP_TUPLE_ELEM(3, 1, st), BOOST_PP_TUPLE_ELEM(3, 2, st), elem) 37 # endif 38 # 39 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_DMC() 40 # define BOOST_PP_SEQ_FILTER_O_I(s, pred, data, res, elem) (pred, data, res BOOST_PP_EXPR_IF(pred(s, data, elem), (elem))) 41 # else 42 # define BOOST_PP_SEQ_FILTER_O_I(s, pred, data, res, elem) (pred, data, res BOOST_PP_EXPR_IF(pred##(s, data, elem), (elem))) 43 # endif 44 # 45 # /* BOOST_PP_SEQ_FILTER_S */ 46 # 47 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG() 48 # define BOOST_PP_SEQ_FILTER_S(s, pred, data, seq) BOOST_PP_SEQ_TAIL(BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_FILTER_O, (pred, data, (nil)), seq))) 49 # else 50 # define BOOST_PP_SEQ_FILTER_S(s, pred, data, seq) BOOST_PP_SEQ_FILTER_S_I(s, pred, data, seq) 51 # define BOOST_PP_SEQ_FILTER_S_I(s, pred, data, seq) BOOST_PP_SEQ_TAIL(BOOST_PP_TUPLE_ELEM(3, 2, BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_FILTER_O, (pred, data, (nil)), seq))) 52 # endif 53 # 54 # endif 55