我有一个结构体,其中包含另一个结构体类型的向量。
struct Element {
val: String,
}
struct Collection {
elements: Vec<Element>,
}
impl Collection {
fn process(&mut self) {
for entry in &self.elements.iter_mut() {
entry.val = "New value".to_string();
println!("{}", entry.val);
}
}
}
fn main() {
let e1 = Element {
val: "My first entry".to_string(),
};
let e2 = Element {
val: "My second entry".to_string(),
};
let mut c = Collection { elements: vec![] };
c.elements.push(e1);
c.elements.push(e2);
c.process();
}
当我尝试迭代它时,会出现以下错误:
error[E0277]: the trait bound `&std::slice::IterMut<'_, Element>: std::iter::Iterator` is not satisfied
--> src/main.rs:11:22
|
11 | for entry in &self.elements.iter_mut() {
| -^^^^^^^^^^^^^^^^^^^^^^^^
| |
| `&std::slice::IterMut<'_, Element>` is not an iterator; maybe try calling `.iter()` or a similar method
| help: consider removing 1 leading `&`-references
|
= help: the trait `std::iter::Iterator` is not implemented for `&std::slice::IterMut<'_, Element>`
= note: required by `std::iter::IntoIterator::into_iter`
我认为这是因为
&self.elements
实际上是一个引用。使用self.elements
也可以工作,但我希望修改实际的对象而不是副本。有什么正确的方法来做到这一点吗?