Interesting thanks. Seems the reason I couldn't find anything on that is because it's internal only and not a feature you're actually meant to use? https://git

Interesting thanks. Seems the reason I couldn't find anything on that is because it's internal only and not a feature you're actually meant to use? https://github.com/microsoft/STL/issues/586 https://github.com/microsoft/STL/issues/586 > We talked about this at the weekly maintainer meeting and decided that we're not comfortable enough with the (lack of) design of this feature to begin documenting it for wide usage.