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Change to a less wasteful use of BOOST_PP_VARIADIC_OPT in BOOST_PP_IS_EMPTY code.

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This commit is contained in:
Edward Diener
2019-09-26 00:43:46 -04:00
parent 22deb165b6
commit 0cdd09e6e1
1 changed files with 21 additions and 15 deletions
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36
include/boost/preprocessor/facilities/is_empty_variadic.hpp
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@ -16,20 +16,6 @@
#
# if BOOST_PP_VARIADICS
#
# include <boost/preprocessor/variadic/opt.hpp>
#
# if BOOST_PP_VARIADIC_OPT()
#
#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(...) \
BOOST_PP_VARIADIC_OPT_ELEM0(BOOST_PP_IS_EMPTY_FUNCTION(__VA_ARGS__),) \
/**/
# else
# include <boost/preprocessor/punctuation/is_begin_parens.hpp>
# include <boost/preprocessor/facilities/detail/is_empty.hpp>
#
@ -51,7 +37,19 @@
/**/
#define BOOST_PP_IS_EMPTY_ZERO(param) 0
# else
# include <boost/preprocessor/variadic/opt.hpp>
#define BOOST_PP_IS_EMPTY(...) \
BOOST_PP_DETAIL_IS_EMPTY_IIF \
( \
BOOST_PP_VARIADIC_OPT() \
) \
( \
BOOST_PP_IS_EMPTY_OPT, \
BOOST_PP_IS_EMPTY_NO_OPT \
) \
(__VA_ARGS__) \
/**/
#define BOOST_PP_IS_EMPTY_NO_OPT(...) \
BOOST_PP_DETAIL_IS_EMPTY_IIF \
( \
BOOST_PP_IS_BEGIN_PARENS \
@ -66,7 +64,15 @@
(__VA_ARGS__) \
/**/
#define BOOST_PP_IS_EMPTY_ZERO(...) 0
#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_OPT_ELEM0(BOOST_PP_IS_EMPTY_FUNCTION(__VA_ARGS__),) \
/**/
# endif /* BOOST_PP_VARIADICS_MSVC && _MSC_VER <= 1400 */
# endif /* BOOST_PP_VARIADIC_OPT() */
# endif /* BOOST_PP_VARIADICS */
# endif /* BOOST_PREPROCESSOR_FACILITIES_IS_EMPTY_VARIADIC_HPP */