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Added OPT macro to determine whether C++20's __VA_OPT__ is supported or not. Updated the undocumented variadic IS_EMPTY to use the functionality of __VA_OPT__ if it exists to provide perfect functionality for testing for emptiness.

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This commit is contained in:
Edward Diener
2019-09-25 06:29:04 -04:00
parent c436de6142
commit e476f10f52
11 changed files with 167 additions and 24 deletions
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10
test/isempty_variadic_standard_failure2.cxx
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@ -16,8 +16,18 @@
#define FUNC_GEN9(x,y,z) anything
#if defined(__cplusplus) && __cplusplus > 201703L
# include <boost/preprocessor/variadic/opt.hpp>
BEGIN BOOST_PP_IS_EMPTY(FUNC_GEN9) == BOOST_PP_VARIADIC_OPT() END
#else
BEGIN BOOST_PP_IS_EMPTY(FUNC_GEN9) == 0 END
#endif
#else
BEGIN 1 == 0 END