我想在堆栈上创建一个可变 struct ，并从助手函数中对其进行变异.
#[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);
}
try 编译此文件将提供:
error[E0308]: mismatched types
--> src/main.rs:19:14
|
19 | addPoint(&game);
| ^^^^^ types differ in mutability
|
= note: expected type `&mut Game`
found type `&Game`
我做错了什么？