CaseyCarter added a comment. In https://reviews.llvm.org/D49118#1157438, @mclow.lists wrote:
> > I've conservatively hidden everything behind _LIBCPP_STD_VER > 17, > > although it could be made available in C++11 mode with some edits. > > If we have a use for this in pre c++2a code, the libc++ convention would be > to implement `__common_reference` that works most everywhere, and then have > `common_reference` that only works > 17, but inherits from the ugly name. > > That might be difficult in this case, because users can extend > `common_reference`. I was thinking more about implementing the new bullet for `common_type` unconditionally. Despite that it wouldn't quite conform in older modes, it would avoid introducing an obscure difference between 20-mode `common_type` and 11-mode `common_type`. That said, I wouldn't do so in MSFTL so I assumed you wouldn't in libc++. https://reviews.llvm.org/D49118 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
