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_DETAIL_CHECK_HPP
13# define BOOST_PREPROCESSOR_DETAIL_CHECK_HPP
14#
15# include <boost/preprocessor/cat.hpp>
16# include <boost/preprocessor/config/config.hpp>
17#
18# /* BOOST_PP_CHECK */
19#
20# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
21# define BOOST_PP_CHECK(x, type) BOOST_PP_CHECK_D(x, type)
22# else
23# define BOOST_PP_CHECK(x, type) BOOST_PP_CHECK_OO((x, type))
24# define BOOST_PP_CHECK_OO(par) BOOST_PP_CHECK_D ## par
25# endif
26#
27# if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC() && ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_DMC()
28# define BOOST_PP_CHECK_D(x, type) BOOST_PP_CHECK_1(BOOST_PP_CAT(BOOST_PP_CHECK_RESULT_, type x))
29# define BOOST_PP_CHECK_1(chk) BOOST_PP_CHECK_2(chk)
30# define BOOST_PP_CHECK_2(res, _) res
31# elif BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
32# define BOOST_PP_CHECK_D(x, type) BOOST_PP_CHECK_1(type x)
33# define BOOST_PP_CHECK_1(chk) BOOST_PP_CHECK_2(chk)
34# define BOOST_PP_CHECK_2(chk) BOOST_PP_CHECK_3((BOOST_PP_CHECK_RESULT_ ## chk))
35# define BOOST_PP_CHECK_3(im) BOOST_PP_CHECK_5(BOOST_PP_CHECK_4 im)
36# define BOOST_PP_CHECK_4(res, _) res
37# define BOOST_PP_CHECK_5(res) res
38# else /* DMC */
39# define BOOST_PP_CHECK_D(x, type) BOOST_PP_CHECK_OO((type x))
40# define BOOST_PP_CHECK_OO(par) BOOST_PP_CHECK_0 ## par
41# define BOOST_PP_CHECK_0(chk) BOOST_PP_CHECK_1(BOOST_PP_CAT(BOOST_PP_CHECK_RESULT_, chk))
42# define BOOST_PP_CHECK_1(chk) BOOST_PP_CHECK_2(chk)
43# define BOOST_PP_CHECK_2(res, _) res
44# endif
45#
46# define BOOST_PP_CHECK_RESULT_1 1, BOOST_PP_NIL
47#
48# endif
49

source code of boost/boost/preprocessor/detail/check.hpp