[libcxx-commits] [libcxx] [libc++] Deprecates and removes shared_ptr::unqiue. (PR #76576)

[Nico Weber via libcxx-commits]

nico wrote:

@ldionne 

As always, please provide an opt-out for this for a release, so that it's possible to roll this in, and then do the cleanup async after the update.

(The basic_string<unsigned char> removal for example took us months due to depa being slow in accepting PRs. That's done now, but without advance notice before the removal, we we wouldn't have been able to update libc++ for months, and in the meantime a bunch of similar things would have landed.)

https://github.com/llvm/llvm-project/pull/76576