[asdfasgasdgasdg]

They've been in the language for about a decade now, and before that we had the tr1 hash_map classes that were available in most environments.

[mcguire]

C++: the language that's been around for 40 years and is completely new!

[einpoklum]

Actually, C++ has barely been around at all. It is only with C++20, IIANM, that they key features Bjarne Stroustrup wanted to imbue it with are in place (IIRC; see his "Design & Evolution of C++" book from 1994). Some might even argue that the language C++ _should_ be is not even all here; it's still gradually arriving.