preprocessor/control/expr_iif.hpp

0001 # /* **************************************************************************
0002 #  *                                                                          *
0003 #  *     (C) Copyright Paul Mensonides 2002.
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_CONTROL_EXPR_IIF_HPP
0015 # define BOOST_PREPROCESSOR_CONTROL_EXPR_IIF_HPP
0016 0017 ">#
0018 # include <boost/preprocessor/config/config.hpp>
0019 0020 ">#
0021 # /* BOOST_PP_EXPR_IIF */
0022 0023 ">#
0024 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
0025 #    define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_EXPR_IIF_I(bit, expr)
0026 # else
0027 #    define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_EXPR_IIF_OO((bit, expr))
0028 #    define BOOST_PP_EXPR_IIF_OO(par) BOOST_PP_EXPR_IIF_I ## par
0029 # endif
0030 0031 ">#
0032 # define BOOST_PP_EXPR_IIF_I(bit, expr) BOOST_PP_EXPR_IIF_ ## bit(expr)
0033 0034 ">#
0035 # define BOOST_PP_EXPR_IIF_0(expr)
0036 # define BOOST_PP_EXPR_IIF_1(expr) expr
0037 0038 ">#
0039 # endif