advancedLifetimes
Lifetime in Structs
Use lifetimes in struct definitions.
Lifetime in Structs
Use lifetimes in struct definitions.
Difficulty
Advanced
Code
rust
#[derive(Debug)]
struct Excerpt<'a> {
text: &'a str,
}
impl<'a> Excerpt<'a> {
fn level(&self) -> i32 {
3
}
}
fn main() {
let novel = String::from("Call me Ishmael. Some years ago...");
let first_sentence = novel.split('.').next().expect("no period");
let excerpt = Excerpt { text: first_sentence };
println!("{:?}", excerpt);
println!("level: {}", excerpt.level());
}Explanation
Structs with references need lifetime annotations.
Key Concepts
- Read the code carefully and understand the data flow
- Try modifying the example to see how it changes behavior
- Run this code in the Rust Playground
Related Topics
Browse more examples in the lifetimes category to build a complete understanding of this topic.