Rust Essentials - Second Edition

Inheritance with traits

Traits can also inherit from other traits, indicated with the : operator:

      trait Trait1 : SuperTrait 

Look at the following code, where trait Monster inherits from trait SuperMonster. In such a case any type that implements Monster must also implement SuperMonster, in this specific case its super1() method:

// see code in Chapter 6/code/super_traits.rs struct Zombie { health: u32, damage: u32 } trait SuperMonster { fn super1(&self); } trait Monster : SuperMonster { fn new(hlt: u32, dam: u32) -> Self; fn attack(&self); fn noise(&self) -> &'static str; } impl SuperMonster for Zombie { fn super1(&self) { println!("I am a SuperMonster"); } } impl Monster for Zombie { fn new(mut h: u32, d: u32) -> Zombie { if h > 100 { ...