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_CONTROL_EXPR_IIF_HPP
13# define BOOST_PREPROCESSOR_CONTROL_EXPR_IIF_HPP
14#
15# include <boost/preprocessor/config/config.hpp>
16#
17# /* BOOST_PP_EXPR_IIF */
18#
19# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
20# define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_EXPR_IIF_I(bit, expr)
21# else
22# define BOOST_PP_EXPR_IIF(bit, expr) BOOST_PP_EXPR_IIF_OO((bit, expr))
23# define BOOST_PP_EXPR_IIF_OO(par) BOOST_PP_EXPR_IIF_I ## par
24# endif
25#
26# define BOOST_PP_EXPR_IIF_I(bit, expr) BOOST_PP_EXPR_IIF_ ## bit(expr)
27#
28# define BOOST_PP_EXPR_IIF_0(expr)
29# define BOOST_PP_EXPR_IIF_1(expr) expr
30#
31# endif
32

source code of boost/boost/preprocessor/control/expr_iif.hpp