On Wed, 27 Jan 2021 at 20:54, Barry Revzin via Liaison < [email protected]> wrote:
> Eric Niebler actually asked this on StackOverflow a few years ago: > https://stackoverflow.com/q/48045470/2069064 > > The accepted answer there is: > > #define PP_THIRD_ARG(a,b,c,...) c#define VA_OPT_SUPPORTED_I(...) > PP_THIRD_ARG(__VA_OPT__(,),true,false,)#define VA_OPT_SUPPORTED > VA_OPT_SUPPORTED_I(?) > > Who is going to remember that without having to look it up though? The #ifdef __VA_OPT__ solution was my first thought, it's unfortunate we forbid it. If we can't have that then I think we do need a feature test macro. The voodoo above will make most developers wish they were using Rust.
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