[libcxx-commits] [libcxx] [String] Allow fancy pointer as pointer type of basic_string allocator (PR #191023)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

Currently, we're sometimes using plain assignment to start lifetime for some union members in `basic_string`. This doesn't work for `offset_ptr`. I think we should use `__construct_at` instead (at least conditionally).

https://github.com/llvm/llvm-project/pull/191023