example-trait.rs

trait Hash {
    fn hash(&self) -> u64;
}

impl Hash for bool {
    fn hash(&self) -> u64 {
        if *self { 0 } else { 1 }
    }
}

impl Hash for i64 {
    fn hash(&self) -> u64 {
        *self as u64
    }
}

fn print_hash<T: Hash>(t: &T) {
    println!("The hash is {}", t.hash())
}

struct HashMap<Key: Hash + Eq, Value> {
    // Silly construct ... Just for demo purpose!
    k: Key,
    v: Value,
}

fn process(v: Vec<&Hash>) {
    // whatever
}

fn main() {
  
}