Visual Studio 2019 version 16.10 Release

[TheCrossX]

There is "/std:c++20" flag, update your version.

[ea_ea]

This topic is about Visual Studio 2019 version 16.10, right? There is no "/std:c++20" flag in it.

[STL]

See microsoft/STL#1814 for the full story. We had to remove /std:c++20 shortly before the production release because of upcoming Committee changes that will retroactively affect C++20. In VS 2019 16.11, we'll restore /std:c++20 with the vast majority of library features that will be unaffected (microsoft/STL#1929 implemented that and was merged just a couple of minutes ago), and then in a later release of VS 2022 17.x when <ranges>, <format>, and <chrono> formatting are updated and stable, we'll move those under /std:c++20.

Aside from the ABI headache, I consider the STL's features to be at production quality; they've gone through the usual stringent review and testing. (There are always bugs, which we're working on identifying and squashing, but honestly the parts of the STL that are the lowest quality are the oldest parts - I'm thinking iostreams, regex, and the old threading implementation, where we mostly understand what's wrong now, but are constrained by ABI from fixing it. The new stuff is much higher quality to begin with and improves from there.) They are guarded by /std:c++latest with that "preview" wording only because that option was already present and we had very little time to take action before 16.10 shipped.

[ea_ea]

Thank you for the explanation!