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Re: [PATCH v2] New mechanism for declaring const-covariant string functions.


On 11/21/2016 06:46 PM, Zack Weinberg wrote:

diff --git a/string/bits/const-covariance.h b/string/bits/const-covariance.h
+#define __CC_VA_NARGS(...)  __CC_VA_NARGS_(__VA_ARGS__, __CC_RSEQ)
+#define __CC_VA_NARGS_(...) __CC_VA_NARGS__(__VA_ARGS__)
+#define __CC_VA_NARGS__(_1, _2, _3, _4, _5, _6, _7, _8, N, ...) N
+#define __CC_RSEQ 8, 7, 6, 5, 4, 3, 2, 1

It's not clear to me what ensures that variadic macros are available at this point. <bits/const-covariance.h> seems to be included unconditionally, not just for GNU or C++11. I don't think you can use variadic macros for this.

Florian


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