高级特征 #

trait Container {
    type Item;
    
    fn get(&self) -> Option<&Self::Item>;
}

struct VecContainer<T> {
    items: Vec<T>,
}

impl<T> Container for VecContainer<T> {
    type Item = T;
    
    fn get(&self) -> Option<&Self::Item> {
        self.items.first()
    }
}

trait Add<Rhs = Self> {
    type Output;
    
    fn add(self, rhs: Rhs) -> Self::Output;
}

trait Pilot {
    fn fly(&self);
}

trait Wizard {
    fn fly(&self);
}

struct Human;

impl Pilot for Human {
    fn fly(&self) {
        println!("机长飞行");
    }
}

impl Wizard for Human {
    fn fly(&self) {
        println!("巫师飞行");
    }
}

fn main() {
    let person = Human;
    Pilot::fly(&person);
    Wizard::fly(&person);
}