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);
}
Trying to compile this gives:
error[E0308]: mismatched types
--> src/main.rs:19:14
|
19 | addPoint(&game);
| ^^^^^ types differ in mutability
|
= note: expected type `&mut Game`
found type `&Game`
What am I doing wrong?
引用也需要标记为可变:
addPoint(&mut game);
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