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# ifndef BOOST_PREPROCESSOR_CONTROL_EXPR_IF_HPP
# define BOOST_PREPROCESSOR_CONTROL_EXPR_IF_HPP
#
# include <boost/preprocessor/config/config.hpp>
# include <boost/preprocessor/control/expr_iif.hpp>
# include <boost/preprocessor/logical/bool.hpp>
#
#
#
# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
# define BOOST_PP_EXPR_IF(cond, expr) BOOST_PP_EXPR_IIF(BOOST_PP_BOOL(cond), expr)
# else
# define BOOST_PP_EXPR_IF(cond, expr) BOOST_PP_EXPR_IF_I(cond, expr)
# define BOOST_PP_EXPR_IF_I(cond, expr) BOOST_PP_EXPR_IIF(BOOST_PP_BOOL(cond), expr)
# endif
#
# endif