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|
struct Animal {
age: i32,
}
type Cat = Animal;
type Dog = Animal;
type LoudDog = Dog;
trait Talk {
fn talk(&self) -> ();
}
impl Talk for Animal {
default fn talk(&self) { // note the use of the default
println!("<silence>");
}
}
impl Talk for Cat {
fn talk(&self) {
println!("Meow");
}
}
impl Talk for Dog {
fn talk(&self) {
println!("Woof!");
}
}
impl Talk for LoudDog {
fn talk(&self) {
println!("WOOF!!");
}
}
fn main() {
let fluffy = Cat(Animal { age: 4 });
let max = Dog(Animal { age: 2 });
let neighbours_dog = LoudDog(Animal { age: 7 });
fluffy.talk();
max.talk();
neighbours_dog.talk();
}
|
