如何在Rust中传递对可变数据的引用? [英] How do I pass a reference to mutable data in Rust?

问题描述

我想在堆栈上创建一个可变结构，并通过辅助函数对其进行突变.

I want to create a mutable struct on the stack and mutate it from helper functions.

#[derive(Debug)]
struct Game {
    score: u32,
}

fn addPoint(game: &mut Game) {
    game.score += 1;
}

fn main() {
    let mut game = Game { score: 0 };

    println!("Initial game: {:?}", game);

    // This works:
    game.score += 1;

    // This gives a compile error:
    addPoint(&game);

    println!("Final game:   {:?}", game);
}

尝试将其编译为:

error[E0308]: mismatched types
  --> src/main.rs:19:14
   |
19 |     addPoint(&game);
   |              ^^^^^ types differ in mutability
   |
   = note: expected type `&mut Game`
              found type `&Game`

我在做什么错了?

推荐答案

该引用也需要标记为可变的:

The reference needs to be marked as mutable too:

addPoint(&mut game);

这篇关于如何在Rust中传递对可变数据的引用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！