boost/preprocessor/detail/check.hpp
# /* ************************************************************************** # * * # * (C) Copyright Paul Mensonides 2002. # * Distributed under the Boost Software License, Version 1.0. (See # * accompanying file LICENSE_1_0.txt or copy at # * http://www.boost.org/LICENSE_1_0.txt) # * * # ************************************************************************** */ # # /* See http://www.boost.org for most recent version. */ # # ifndef BOOST_PREPROCESSOR_DETAIL_CHECK_HPP # define BOOST_PREPROCESSOR_DETAIL_CHECK_HPP # # include <boost/preprocessor/cat.hpp> # include <boost/preprocessor/config/config.hpp> # # /* BOOST_PP_CHECK */ # # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC() # define BOOST_PP_CHECK(x, type) BOOST_PP_CHECK_D(x, type) # else # define BOOST_PP_CHECK(x, type) BOOST_PP_CHECK_OO((x, type)) # define BOOST_PP_CHECK_OO(par) BOOST_PP_CHECK_D ## par # endif # # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_DMC() # define BOOST_PP_CHECK_D(x, type) BOOST_PP_CHECK_1(BOOST_PP_CAT(BOOST_PP_CHECK_RESULT_, type x)) # define BOOST_PP_CHECK_1(chk) BOOST_PP_CHECK_2(chk) # define BOOST_PP_CHECK_2(res, _) res # elif BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() # define BOOST_PP_CHECK_D(x, type) BOOST_PP_CHECK_1(type x) # define BOOST_PP_CHECK_1(chk) BOOST_PP_CHECK_2(chk) # define BOOST_PP_CHECK_2(chk) BOOST_PP_CHECK_3((BOOST_PP_CHECK_RESULT_ ## chk)) # define BOOST_PP_CHECK_3(im) BOOST_PP_CHECK_5(BOOST_PP_CHECK_4 im) # define BOOST_PP_CHECK_4(res, _) res # define BOOST_PP_CHECK_5(res) res # else // DMC # define BOOST_PP_CHECK_D(x, type) BOOST_PP_CHECK_OO((type x)) # define BOOST_PP_CHECK_OO(par) BOOST_PP_CHECK_0 ## par # define BOOST_PP_CHECK_0(chk) BOOST_PP_CHECK_1(BOOST_PP_CAT(BOOST_PP_CHECK_RESULT_, chk)) # define BOOST_PP_CHECK_1(chk) BOOST_PP_CHECK_2(chk) # define BOOST_PP_CHECK_2(res, _) res # endif # # define BOOST_PP_CHECK_RESULT_1 1, BOOST_PP_NIL # # endif