Chapter 21 Smart Pointers

• 21.1 Introduction to smart pointers
• 21.2 Box<T>
• 21.3 Deref and deref coercion
• 21.4 Drop in depth
• 21.5 Rc<T>
• 21.6 RefCell and interior mutability
• 21.7 Reference cycles and Weak
• 21.x Chapter 21 summary and quiz