#[derive(Debug)]
struct YourType {
    value: usize
}

impl YourType {
    // This takes an "immutable" (non-changable) reference to the object its called on
    fn do_something(&self) -> usize {
        self.value + 1
    }

    // This takes an "mutable" (changable) reference to the object its called on
    fn do_edit(&mut self) {
        self.value += 1
    }

    // Consumes the object its called on
    fn eat(self) -> usize {
        self.value + 2
    }
}

fn main() {
    let mut a = YourType { value: 1 };
    println!("a: {:?}", a);
    a.do_edit();
    println!("b: {:?}", a);
    println!("consumed: {}", a.eat());
    // if you would try to use a beyond this point it would throw an error,
    // since a has been consumed
}