[1234554321a]

“Modern” C++ is completely different to the pre-2000 or even pre-2010 C++.

[waldrews]

For those of us who were last paid to write C++ in a different millenium, suggestions for a book to catch up?

[adastra22]

Yes: https://www.rust-lang.org/learn

(Less snark: just browse cppreference.com. The standard library is updated to make use of new features, so just check out the changes between C++14, C++17, C++20, etc.)