compiler/boost/preprocessor/control/expr_iif.hpp

   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