On Thu, Jan 28, 2021 at 4:12 AM Jonathan Wakely <[email protected]> wrote:
> > > 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. > Yeah but isn't the purpose of StackOverflow's existence to copy and paste code from it? Just need to remember how to google the question. Barry
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