小编gui*_*tes的帖子

游戏的最小示例，玩家拥有一个位置并随着时间的流逝而走动。编译如下：

use std::thread::sleep;
use std::time::Duration;

struct Player {
    position: usize,
}

impl Player {
    fn new() -> Self {
        Self { position: 0 }
    }
}

impl Player {
    fn get_position(&self) -> usize {
        self.position
    }
}

impl Player {
    fn walk(&mut self) {
        self.position += 1;
    }
}

fn main() {
    let mut player = Player::new();
    loop {
        player.walk();
        sleep(Duration::from_secs(1));
    }
}

如果玩家借用该位置而不是拥有它，则不会编译：

use std::thread::sleep;
use std::time::Duration;

struct Player<'a> {
    position: &'a mut usize,
}

impl<'a> Player<'a> {
    fn …