CODEWITHSUNDEEP
for-loopfilterrust
HiDefender
HiDefender

Reputation: 2368

Idiomatic way to use filter()

When using filter, you receive a reference because filter does not return ownership. However iter() already references what you are iterating over so you get code that looks like this:

fn main() {
    let mut vec: Vec<(bool, i32)> = Vec::new();
    vec.push((true, 1));
    vec.push((false, 2));
    vec.push((true, 3));
    for &(_, x) in vec.iter().filter(|&&(exists, _)| exists) {
        println!("{}", x);
    }
}

That seems like a lot of & to me. Is this considered the idiomatic way to implement filter()?

Upvotes: 1

Views: 76

Answers (1)

Jacob
Jacob

Reputation: 1553

In short yes. Although in your particular example you can use into_iter to get an iterator that does return ownership.

Upvotes: 4

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