Rust Generics

playground.rs

#[derive(Debug)]
struct Person<T> {
    id: T,
    title: String
}

impl <T> Person<T> {
  fn new<I: Into<String>>(id: T, title: I) -> Self {
    Person {
      id: id,
      title: title.into()
    }
  }
}

//Traits can be implemented for specific bounds, or blanket
//Without specialisation, if your bounds collide then you're gonna have a bad time
impl ToString for Person<i32> {
    fn to_string(&self) -> String {
        format!("i32: {}, {}", self.id, self.title)
    }
}

impl ToString for Person<bool> {
    fn to_string(&self) -> String {
        format!("bool: {}, {}", self.id, self.title)
    }
}

fn main() {
  let person1 = Person::new(1, "Joe");
  let person2 = Person::new(true, String::from("Jan"));
  
  println!("1: {} 2: {}", person1.to_string(), person2.to_string());
}