包含可变切片的结构[重复]

我试图理解生命周期并在结构中存储可变切片。

我提出了一个带有切片和 take 将返回的函数 n 元素(如果存在)并将其余部分存储在结构本身中。此代码不可编译。

fn main() {
    let mut v: Vec<u8> = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    let mut blah = Blah { slice: &mut v[..] };

    let b = blah.take(5);

    println!("b: {:?}", b);
}

#[derive(Debug)]
struct Blah<'a> {
    slice: &'a mut [u8],
}

impl<'a> Blah<'a> {
    pub fn take(&'a mut self, n: usize) -> Option<Self> {
        if self.slice.len() > n {
            let blah = Blah {
                slice: &mut self.slice[..n],
            };
            self.slice = &mut self.slice[n..];
            Some(blah)
        } else {
            None
        }
    }
}

error[E0499]: cannot borrow `*self.slice` as mutable more than once at a time
  --> src/main.rs:21:31
   |
15 | impl<'a> Blah<'a> {
   |      -- lifetime `'a` defined here
...
19 |                 slice: &mut self.slice[..n],
   |                             ---------- first mutable borrow occurs here
20 |             };
21 |             self.slice = &mut self.slice[n..];
   |                               ^^^^^^^^^^ second mutable borrow occurs here
22 |             Some(blah)
   |             ---------- returning this value requires that `*self.slice` is borrowed for `'a`

我有一个大的内存缓冲区,我不想复制。相反,我希望通过携带“胖指针”(类似于偏移量+长度)来继续引用相同的内存。