The Ultimate Guide to Rust Programming/

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Clone and Derive

Clone and Derive

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We’ve seen the clone() method for Strings as a way to create a duplicate of an owned String. In some cases, this can be relevant for dealing with ownership issues. As a reminder, this code fails due to usage of a moved value:

Rust 1.40.0
struct Fruit {
    apples: i32,
    bananas: i32,
}
// Should use a reference, but I'm proving a point
fn print_fruit(fruit: Fruit) {
    println!("Apples: {}, bananas: {}", fruit.apples, fruit.bananas);
}
fn main() {
    let mut fruit = Fruit { apples: 5, bananas: 10 };
    print_fruit(fruit); // moved here
    fruit.apples *= 2; // this will fail
    fruit.bananas *= 3;
    print_fruit(fruit);
}

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