[PATCH] D32385: [libcxx] optional: Implement LWG 2900 and P0602
Casey Carter via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Thu May 4 09:02:56 PDT 2017
CaseyCarter added a comment.
In https://reviews.llvm.org/D32385#745771, @EricWF wrote:
> So Itanium ABI has this quirk where trivial types are passed using different conventions than non-trivial types. This means changing the triviality of `std::optional` for any instantiation is potentially ABI breaking. I'll need to do more investigation to find out how this will affect libc++, and if we can take this change.
libc++ committed to ABI stability for `optional`, a new feature of C++17, before the standard shipped?
More information about the cfe-commits