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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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21
test/test.h
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@ -14,24 +14,7 @@
# ifndef BOOST_LIBS_PREPROCESSOR_REGRESSION_TEST_H
# define BOOST_LIBS_PREPROCESSOR_REGRESSION_TEST_H
#
# include <boost/preprocessor/cat.hpp>
# include <libs/preprocessor/test/test_macro.h>
# include <libs/preprocessor/test/test_main.h>
#
# define BEGIN typedef int BOOST_PP_CAT(test_, __LINE__)[((
# define END )==1) ? 1 : -1];
#if defined(__cplusplus)
#include <cstdio>
#if !defined(_STLP_MSVC) || _STLP_MSVC >= 1300
namespace std { }
using namespace std;
#endif
#else
#include <stdio.h>
#endif
int main(void) {
printf("pass " __TIME__);
return 0;
}
# endif