[libcxx-commits] [libcxx] [libc++] Add `__exchange` as a C++11 utility (PR #187953)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

> @frederick-vs-ja what is inconvenient about manually writing out `std::__exchange(__obj, _Tp())`?

I think this is still convenient enough as long as `_Tp` is easy to spell.

https://github.com/llvm/llvm-project/pull/187953