无法在数组中的“&”引用中可变地借用数据

Cannot borrow data mutably in a `&` reference in array

我想更改另一个结构中数组中结构的值:

struct Foo<'a> {
    bar: &'a [&'a mut Bar]
}

struct Bar {
    baz: u16
}

impl<'a> Foo<'a> {
    fn add(&mut self, x: u16) {
        self.bar[0].add(x);
    }
}

impl Bar {
    fn add(&mut self, x: u16) {
        self.baz += x;
    }
}

这给出了一个错误:

error[E0389]: cannot borrow data mutably in a `&` reference
  --> src/main.rs:11:9
   |
11 |         self.bar[0].add(x);
   |         ^^^^^^^^^^^ assignment into an immutable reference

如何解决这个例子?

您可以通过附加 mut:

修复编译错误

bar: &'a [&'a mut Bar]bar: &'a mut [&'a mut Bar]