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In C++20 variadic data can be empty. This means that BOOST_PP_VARIADIC_SIZE now returns 0 for empty data instead of 1, and that conversions to and from empty variadic data and lists or arrays, which can be empty, work properly.

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Edward Diener
2020-06-29 21:57:23 -04:00
parent ffb26db146
commit 3ac4c915a3
14 changed files with 173 additions and 16 deletions
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16
include/boost/preprocessor/variadic/to_array.hpp
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@ -14,15 +14,23 @@
# define BOOST_PREPROCESSOR_VARIADIC_TO_ARRAY_HPP
#
# include <boost/preprocessor/config/config.hpp>
# include <boost/preprocessor/control/if.hpp>
# include <boost/preprocessor/tuple/to_array.hpp>
# if BOOST_PP_VARIADICS_MSVC
# include <boost/preprocessor/variadic/size.hpp>
# endif
# include <boost/preprocessor/variadic/has_opt.hpp>
# include <boost/preprocessor/variadic/size.hpp>
#
# /* BOOST_PP_VARIADIC_TO_ARRAY */
#
# if BOOST_PP_VARIADICS
# if BOOST_PP_VARIADICS_MSVC
# if BOOST_PP_VARIADIC_HAS_OPT()
# if BOOST_PP_VARIADICS_MSVC
# define BOOST_PP_VARIADIC_TO_ARRAY_NON_EMPTY(...) BOOST_PP_TUPLE_TO_ARRAY_2(BOOST_PP_VARIADIC_SIZE(__VA_ARGS__),(__VA_ARGS__))
# else
# define BOOST_PP_VARIADIC_TO_ARRAY_NON_EMPTY(...) BOOST_PP_TUPLE_TO_ARRAY((__VA_ARGS__))
# endif
# define BOOST_PP_VARIADIC_TO_ARRAY_EMPTY(...) (0,())
# define BOOST_PP_VARIADIC_TO_ARRAY(...) BOOST_PP_IF(BOOST_PP_VARIADIC_SIZE(__VA_ARGS__),BOOST_PP_VARIADIC_TO_ARRAY_NON_EMPTY,BOOST_PP_VARIADIC_TO_ARRAY_EMPTY)(__VA_ARGS__)
# elif BOOST_PP_VARIADICS_MSVC
# define BOOST_PP_VARIADIC_TO_ARRAY(...) BOOST_PP_TUPLE_TO_ARRAY_2(BOOST_PP_VARIADIC_SIZE(__VA_ARGS__),(__VA_ARGS__))
# else
# define BOOST_PP_VARIADIC_TO_ARRAY(...) BOOST_PP_TUPLE_TO_ARRAY((__VA_ARGS__))