Comment by tialaramex

For one thing, some of the places which would publish this kind of thing will authorize authors to provide anybody and everybody pre-prints but not the final copy they published.

In principle you could go (pay to†) read the actual final published copy, maybe it's different, but almost always it's basically the same, the text is enough to qualify.

If you go to https://eel.is/c++draft/ you'll find the "Draft" C++ standard, and it has this text:

Note: this is an early draft. It's known to be incomplet and incorrekt, and it has lots of bad formatting.

Nevertheless, the people who wrote your C++ compiler used that "draft" document, because it isn't reasonable to wait a few years for ISO to publish the "real" document which is identical other than lacking that scary text and having a bunch of verbiage about how ISO owns this document and it mustn't be republished.

And you might be thinking "OK, I'm sure those GNU hippies don't pay for a real published copy, but surely the Microsoft Corporation buys their engineers a real one". Nope. Waste of money.

† If you have a relationship with a research institution it might have this or be willing to help you order it from somewhere else at no personal cost.