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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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9
include/boost/preprocessor/tuple/to_array.hpp
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@ -15,9 +15,11 @@
#
# include <boost/preprocessor/cat.hpp>
# include <boost/preprocessor/config/config.hpp>
# include <boost/preprocessor/control/if.hpp>
# include <boost/preprocessor/facilities/overload.hpp>
# include <boost/preprocessor/tuple/size.hpp>
# include <boost/preprocessor/variadic/size.hpp>
# include <boost/preprocessor/variadic/has_opt.hpp>
#
# /* BOOST_PP_TUPLE_TO_ARRAY */
#
@ -29,7 +31,12 @@
# define BOOST_PP_TUPLE_TO_ARRAY_1(tuple) (BOOST_PP_TUPLE_SIZE(tuple), tuple)
# else
# define BOOST_PP_TUPLE_TO_ARRAY(...) BOOST_PP_OVERLOAD(BOOST_PP_TUPLE_TO_ARRAY_, __VA_ARGS__)(__VA_ARGS__)
# define BOOST_PP_TUPLE_TO_ARRAY_1(tuple) (BOOST_PP_VARIADIC_SIZE tuple, tuple)
# if BOOST_PP_VARIADIC_HAS_OPT()
# define BOOST_PP_TUPLE_TO_ARRAY_1(tuple) BOOST_PP_TUPLE_TO_ARRAY_1_SIZE(BOOST_PP_VARIADIC_SIZE tuple, tuple)
# define BOOST_PP_TUPLE_TO_ARRAY_1_SIZE(size,tuple) (BOOST_PP_IF(size,size,1), tuple)
# else
# define BOOST_PP_TUPLE_TO_ARRAY_1(tuple) (BOOST_PP_VARIADIC_SIZE tuple, tuple)
# endif
# endif
# define BOOST_PP_TUPLE_TO_ARRAY_2(size, tuple) (size, tuple)
# else