George He

I'm an experienced C++ programmer, but still feel that I need a mindset shift when starting to work with Rust.

• References can be immutable (&) or mutable (&mut), which is straightforward for simplest cases. There are more complex cases, e.g. there are data types with interior mutability (e.g. RefCell), there are multi-level references (& &mut).
• Rust also models memory safety in multi-thread scenarios, so there's Send and Sync. They have intricate rules related to various types of references, e.g. when &T is Send or Sync? How about &mut T?
• There are various data types, like Rc , Arc, Cell, RefCell, Mutex, RwLock, Cow . When to pick which?