Rust Advanced Concepts - Programming

Lifetimes describe how long references remain valid so the borrow checker can guarantee no reference outlives the data it points to. Most are inferred, but when relationships are ambiguous you annotate them so the compiler can prove there are no dangling references.

Use generics with trait bounds for zero-cost static dispatch when types are known at compile time, producing monomorphized fast code. Use a dyn trait object when you need a heterogeneous collection or want to reduce code size, accepting a small runtime dispatch cost.

Interior mutability lets you mutate data through a shared reference, moving borrow checking to runtime. RefCell provides this for single-threaded code and Mutex for multithreaded code, useful when a type API needs mutation but the ownership graph only allows shared references.

Types implement the Send trait if they can move between threads and Sync if they can be shared by reference. The compiler only allows sharing across threads when these traits hold, so ownership and borrowing rules combine to reject data races before running.

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