C++ auto copies as well, it's just a feature of value semantics. References must be taken manually - versus Java or C#, where we assume reference and then have

C++ auto copies as well, it's just a feature of value semantics. References must be taken manually - versus Java or C#, where we assume reference and then have to explicitly say copy. Rust, I believe, usually moves by default - not copy, but close - for most types. The nice thing about value semantics is they are very safe and can be very performant. Like in PHP, if we take array that's a copy. But not really - it's secretly COW under the hood. So it's actually very fast if we don't mutate, but we get the safety of value semantics anyway.