[英]How do you make the value of a Some returned from HashMap::get mutable?
I can't figure out how to modify the value returned by Some
: 我不知道如何修改Some
返回的值:
fn add_employee(
employees: &mut HashMap<String, Vec<String>>,
employee_name: &String,
department_name: &String,
) {
match employees.get(department_name) {
Some(members) => {
members.push(employee_name.clone()); // what I want, but it doesn't work
}
None => {}
}
}
The compiler complains: 编译器抱怨:
error[E0596]: cannot borrow immutable borrowed content `*members` as mutable
--> src/main.rs:10:13
|
10 | members.push(employee_name.clone());
| ^^^^^^^ cannot borrow as mutable
使用get_mut()
代替get()
。
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