https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60976
--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jonathan Wakely from comment #20) > (In reply to Giuseppe Ottaviano from comment #19) > > The regression might have been already solved in r225244, which uses yet > > another SFINAE pattern without extra template arguments, which I believe are > > the cause of the regression. However I haven't tested it yet. > > That would be nice to know, because I now use that kind of void_t-style > constraint in a few places, and plan to use it more widely. My measurements > do show that using void_t-style constraints result in small but measurable > reductions in compile time and memory use. Oh, I looked at the wrong bit of r225244, it's using SFINAE in a trailing-return-type that matters here, not the __detected_or_t_ changes.
