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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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test/variadic.cxx
+14
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@@ -26,6 +26,12 @@
#define VDATA_LARGE 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
#define VDATA_VERY_LARGE 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
#if BOOST_PP_VARIADIC_HAS_OPT()
#define VDATA_EMPTY
#endif
BEGIN BOOST_PP_VARIADIC_ELEM(4,VDATA) == 4 END
BEGIN BOOST_PP_VARIADIC_ELEM(6,7,11,3,8,14,85,56,92,165) == 56 END
BEGIN BOOST_PP_VARIADIC_ELEM(29,VDATA_LARGE) == 29 END
@@ -36,6 +42,14 @@ BEGIN BOOST_PP_VARIADIC_SIZE(7,11,3,8,14,85,56,92,165) == 9 END
BEGIN BOOST_PP_VARIADIC_SIZE(VDATA_LARGE) == 33 END
BEGIN BOOST_PP_VARIADIC_SIZE(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 END
BEGIN BOOST_PP_VARIADIC_SIZE(VDATA_VERY_LARGE) == 64 END
#if BOOST_PP_VARIADIC_HAS_OPT()
BEGIN BOOST_PP_VARIADIC_SIZE(VDATA_EMPTY) == 0 END
BEGIN BOOST_PP_VARIADIC_SIZE() == 0 END
#endif
BEGIN BOOST_PP_ARRAY_SIZE(BOOST_PP_VARIADIC_TO_ARRAY(VDATA)) == 7 END
BEGIN BOOST_PP_ARRAY_SIZE(BOOST_PP_VARIADIC_TO_ARRAY(VDATA_VERY_LARGE)) == 64 END
BEGIN BOOST_PP_ARRAY_ELEM(4,BOOST_PP_VARIADIC_TO_ARRAY(7,11,3,8,14,85,56,92,165)) == 14 END