| # /* ************************************************************************** |
| # * * |
| # * (C) Copyright Edward Diener 2014,2019. |
| # * 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_FACILITIES_IS_EMPTY_VARIADIC_HPP |
| # define BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP |
| # |
| # include <boost/preprocessor/config/config.hpp> |
| # include <boost/preprocessor/punctuation/is_begin_parens.hpp> |
| # include <boost/preprocessor/facilities/detail/is_empty.hpp> |
| # |
| #if BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 |
| # |
| #define BOOST_PP_IS_EMPTY(param) \ |
| BOOST_PP_DETAIL_IS_EMPTY_IIF \ |
| ( \ |
| BOOST_PP_IS_BEGIN_PARENS \ |
| ( \ |
| param \ |
| ) \ |
| ) \ |
| ( \ |
| BOOST_PP_IS_EMPTY_ZERO, \ |
| BOOST_PP_DETAIL_IS_EMPTY_PROCESS \ |
| ) \ |
| (param) \ |
| /**/ |
| #define BOOST_PP_IS_EMPTY_ZERO(param) 0 |
| # else |
| # if defined(__cplusplus) && __cplusplus > 201703L |
| # include <boost/preprocessor/variadic/has_opt.hpp> |
| #define BOOST_PP_IS_EMPTY(...) \ |
| BOOST_PP_DETAIL_IS_EMPTY_IIF \ |
| ( \ |
| BOOST_PP_VARIADIC_HAS_OPT() \ |
| ) \ |
| ( \ |
| BOOST_PP_IS_EMPTY_OPT, \ |
| BOOST_PP_IS_EMPTY_NO_OPT \ |
| ) \ |
| (__VA_ARGS__) \ |
| /**/ |
| #define BOOST_PP_IS_EMPTY_FUNCTION2(...) \ |
| __VA_OPT__(0,) 1 \ |
| /**/ |
| #define BOOST_PP_IS_EMPTY_FUNCTION(...) \ |
| BOOST_PP_IS_EMPTY_FUNCTION2(__VA_ARGS__) \ |
| /**/ |
| #define BOOST_PP_IS_EMPTY_OPT(...) \ |
| BOOST_PP_VARIADIC_HAS_OPT_ELEM0(BOOST_PP_IS_EMPTY_FUNCTION(__VA_ARGS__),) \ |
| /**/ |
| # else |
| #define BOOST_PP_IS_EMPTY(...) \ |
| BOOST_PP_IS_EMPTY_NO_OPT(__VA_ARGS__) \ |
| /**/ |
| # endif /* defined(__cplusplus) && __cplusplus > 201703L */ |
| #define BOOST_PP_IS_EMPTY_NO_OPT(...) \ |
| BOOST_PP_DETAIL_IS_EMPTY_IIF \ |
| ( \ |
| BOOST_PP_IS_BEGIN_PARENS \ |
| ( \ |
| __VA_ARGS__ \ |
| ) \ |
| ) \ |
| ( \ |
| BOOST_PP_IS_EMPTY_ZERO, \ |
| BOOST_PP_DETAIL_IS_EMPTY_PROCESS \ |
| ) \ |
| (__VA_ARGS__) \ |
| /**/ |
| #define BOOST_PP_IS_EMPTY_ZERO(...) 0 |
| # endif /* BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 */ |
| # endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP */ |