Lifetimes

Overview

Lifetimes in Rust ensure references are valid for as long as they are needed, preventing dangling references.

Topics

• Lifetime Annotations
• Borrow Checker
• Lifetime Elision

Examples

fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
    if x.len() > y.len() {
        x
    } else {
        y
    }
}

let string1 = String::from("long string");
let string2 = "short";
let result = longest(&string1, string2);
println!("The longest string is {}", result);

Tags

#rust #lifetimes #references