Shared via Rust Playground

playground.rs

trait Hoge<A> {
    fn aaa(&self) -> A;
    fn bbb(&self) -> i32;
}

fn call_hoge_i32<X: Hoge<i32>>(hoge: &X) {
    println!("aaa => {}", hoge.aaa());
    println!("bbb => {}", hoge.bbb());
}

fn call_hoge_string<X: Hoge<String>>(hoge: &X) {
    println!("aaa => {}", hoge.aaa());
    println!("bbb => {}", hoge.bbb());   
}

fn call_hoge_generic<T: std::fmt::Display, X: Hoge<T>>(hoge: &X) {
    println!("aaa => {}", hoge.aaa());
    println!("bbb => {}", hoge.bbb());   
}

struct Cat;

impl Hoge<i32> for Cat {
    fn aaa(&self) -> i32 {
        return 11
    }
    fn bbb(&self) -> i32 {
        return 22
    }
}

impl Hoge<String> for Cat {
    fn aaa(&self) -> String {
        return "sss".to_string()
    }
    fn bbb(&self) -> i32 {
        return 33
    }
}

fn main() {
    let cat = Cat;
    call_hoge_i32(&cat);
    call_hoge_string(&cat);
    call_hoge_generic(&cat);
}