[libcxx-commits] [libcxx] [libc++] Document the strengthened noexcept convention (PR #203869)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

> First, how did you get that number?

By searching `strengthened` in comments in MSVC STL's headers, excluding a quite small numbers of potential exceptions. Most occurrences `strengthened` mean "noexcept-specification strengthened". There're currently ~2190 such occurrences, and only ~10 of them refer to strengthening from `noexcept(Cond)` to `noexcept(true)`.

> Second, why is it not helpful?

Perhaps because I'm somehow thinking these along with MSVC STL's defaults...

On the other hand, introducing `// strengthened` is a bit MSVC-STL-ism. I guess the initial introduction of it into libc++ was under the influence of MSVC STL, and the issue is also investigating "whether we want to do the same".

https://github.com/llvm/llvm-project/pull/203869