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boost_preprocessor/include/boost/preprocessor/control/expr_iif.hpp

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2002-09-08 10:22:48 +00:00
# /* **************************************************************************
# * *
# * (C) Copyright Paul Mensonides 2002. Permission to copy, use, *
# * modify, sell, and distribute this software is granted provided *
# * this copyright notice appears in all copies. This software is *
# * provided "as is" without express or implied warranty, and with *
# * no claim at to its suitability for any purpose. *
# * *
# ************************************************************************** */
#
# /* See http://www.boost.org for most recent version. */
#
# ifndef BOOST_PREPROCESSOR_CONTROL_EXPR_IIF_HPP
# define BOOST_PREPROCESSOR_CONTROL_EXPR_IIF_HPP
#
# include <boost/preprocessor/cat.hpp>
# include <boost/preprocessor/config/config.hpp>
#
# /* BOOST_PP_EXPR_IIF */
#
# if BOOST_PP_CONFIG_FLAGS & BOOST_PP_CONFIG_IDEAL
# define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_CAT(BOOST_PP_EXPR_IIF_, bit)(expr)
# else
# if ~BOOST_PP_CONFIG_FLAGS & BOOST_PP_CONFIG_MWCW
# define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_EXPR_IIF_D(bit, expr)
# else
# define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_EVIL_EXPR_IIF_D((bit, expr))
# define BOOST_PP_EVIL_EXPR_IIF_D(par) BOOST_PP_EXPR_IIF_D ## par
# endif
# define BOOST_PP_EXPR_IIF_D(bit, expr) BOOST_PP_EXPR_IIF_ ## bit(expr)
# endif
#
# define BOOST_PP_EXPR_IIF_0(expr)
# define BOOST_PP_EXPR_IIF_1(expr) expr
#
# endif