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The Ultimate Guide to Rust Programming

Copy Values

Explore how Rust manages ownership and the Copy trait, enabling you to understand why some types can be copied automatically while others cannot. Gain clarity on value movement and how to work effectively with owned data.

We'll cover the following...

OK, I get it. A value has an owner, and you can’t use a value after it’s been moved to a new owner. Awesome. Then why does this code work?

Rust 1.40.0
fn count(apples: i32) {
    println!("You have {} apples", apples);
}
fn price(apples: i32) -> i32 {
    apples * 8
}
fn main() {
    let apples: i32 = 10;
    count(apples);
    let price = price(apples);
    println!("The apples are worth {} cents", price);
}

We create the value 10, owned by the main function, and put it in the apples variable. Then we call count(apples), which moves the value into the ...