https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91780
--- Comment #10 from Mikael Persson <mikael.p.persson at gmail dot com> --- Thats great. Saw the dates on the other pr, jikes this has been around a while. Testing z.containers_[0]->i is clever, ill add a test for that ( or more generally z.containers_[0]->begin(), static_assert if i can figure out how. Is there a way to make the syntax for a zip iterator for(auto& [a,b...] :zip(...))? So for(auto [a,...] : zip(...)) Would create local copies as expected? As is i renamed it to zip::view, which seemed easier to read. ( And fixed a bunch of other things too, but adding static assert clang only meant its been practically unused. In particular as clang is still horrendously slow for std::random compared to gcc. ) On Fri, 17 Dec 2021, 11:51 redi at gcc dot gnu.org, < gcc-bugzi...@gcc.gnu.org> wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91780 > > --- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> --- > GCC 10.1 isn't using the deduction guide at all, it seems to prefer to > deduce > the class type using the zip(Containers...) constructor, which deduces > non-reference types. > > If I change the deduction guide to: > > template <typename... Container_types> > zip(Container_types&&... containers) -> zip<int>; > > Then GCC 10.1 still compiles it, because it doesn't use that guide anyway. > Whereas GCC 10.2 gives an error, because it does deduce as zip<int> and so > z.containers_[0]->i is invalid. > > -- > You are receiving this mail because: > You reported the bug.
