On Dec 19, 2016, at 5:27 PM, Richard Smith <richard@metafoo.co.uk> wrote:

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/p0195r2.html suggests a feature test macro of __cpp_variadic_using; the value would presumably be 201611. Does that seem OK to everyone?

I think it is okay.

I think it is slightly odd as the change is to allow multiple names in a using-declaration, but the expected use case is for variadics.

I’d also be okay with something like __cpp_multi_using.

__cpp_variadic_using had more support when it was discussed in core, FWIW.

John.