Space Age

https://exercism.org/tracks/rust/exercises/space-age

条件

初期コード

#[derive(Debug)]
pub struct Duration;

impl From<u64> for Duration {
    fn from(s: u64) -> Self {
        todo!("s, measured in seconds: {s}")
    }
}

pub trait Planet {
    fn years_during(d: &Duration) -> f64 {
        todo!("convert a duration ({d:?}) to the number of years on this planet for that duration");
    }
}

pub struct Mercury;
pub struct Venus;
pub struct Earth;
pub struct Mars;
pub struct Jupiter;
pub struct Saturn;
pub struct Uranus;
pub struct Neptune;

impl Planet for Mercury {}
impl Planet for Venus {}
impl Planet for Earth {}
impl Planet for Mars {}
impl Planet for Jupiter {}
impl Planet for Saturn {}
impl Planet for Uranus {}
impl Planet for Neptune {}

考察

メモ

• impl From について
  • FromおよびInto - Rust By Example 日本語版
• そもそも traitとは?