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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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This commit is contained in:
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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15
test/array.cxx
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@ -23,6 +23,7 @@
# if BOOST_PP_VARIADICS
# include <boost/preprocessor/variadic/size.hpp>
# include <boost/preprocessor/variadic/elem.hpp>
# include <boost/preprocessor/variadic/has_opt.hpp>
# endif
# define ARRAY_EMPTY (0, ())
@ -66,10 +67,19 @@ BEGIN BOOST_PP_VARIADIC_SIZE(BOOST_PP_ARRAY_ENUM((5, (0, 1, 2, 3, 4)))) == 5 END
BEGIN BOOST_PP_VARIADIC_SIZE(BOOST_PP_ARRAY_ENUM(ARRAY_LARGE)) == 33 END
BEGIN BOOST_PP_VARIADIC_SIZE(BOOST_PP_ARRAY_ENUM(ARRAY_VERY_LARGE)) == 64 END
BEGIN BOOST_PP_VARIADIC_SIZE(BOOST_PP_ARRAY_ENUM((64, (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)))) == 64 END
# if BOOST_PP_VARIADIC_HAS_OPT()
BEGIN BOOST_PP_VARIADIC_SIZE(BOOST_PP_ARRAY_ENUM(ARRAY_ONE)) == 0 END
# else
BEGIN BOOST_PP_VARIADIC_SIZE(BOOST_PP_ARRAY_ENUM(ARRAY_ONE)) == 1 END
# endif
# endif
// to_list
BEGIN BOOST_PP_LIST_AT(BOOST_PP_ARRAY_TO_LIST(ARRAY), 1) == 1 END
@ -184,7 +194,10 @@ BEGIN BOOST_PP_ARRAY_ELEM(28, BOOST_PP_ARRAY_REPLACE(ARRAY_VERY_LARGE, 28, 1)) =
// reverse
BEGIN BOOST_PP_ARRAY_SIZE(BOOST_PP_ARRAY_REVERSE(ARRAY_VERY_LARGE)) == 64 END
BEGIN BOOST_PP_IS_EMPTY(BOOST_PP_ARRAY_ELEM(0, BOOST_PP_ARRAY_REVERSE(ARRAY_ONE))) == 1 END
// BEGIN BOOST_PP_IS_EMPTY(BOOST_PP_ARRAY_ELEM(0, BOOST_PP_ARRAY_REVERSE(ARRAY_ONE))) == 1 END
BEGIN BOOST_PP_IS_EMPTY(BOOST_PP_ARRAY_ELEM(0, ARRAY_ONE)) == 1 END
BEGIN BOOST_PP_ARRAY_ELEM(0, BOOST_PP_ARRAY_REVERSE(ARRAY)) == 2 END
BEGIN BOOST_PP_ARRAY_ELEM(29, BOOST_PP_ARRAY_REVERSE(ARRAY_LARGE)) == 3 END
BEGIN BOOST_PP_ARRAY_ELEM(38, BOOST_PP_ARRAY_REVERSE(ARRAY_VERY_LARGE)) == 25 END