Rust by Example

Annotation of lifetimes in trait methods basically are similar to functions. Note that impl may have annotation of lifetimes too.

// A struct with annotation of lifetimes.

#[derive(Debug)]

struct Borrowed<'a> {

x: &'a i32,

}

// Annotate lifetimes to impl.

impl<'a> Default for Borrowed<'a> {

fn default() -> Self {

Self {

x: &10,

}

}

}

fn main() {

let b: Borrowed = Default::default();

println!("b is {:?}", b);

}

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