有没有办法获取 Vec<T> 的可变子切片的引用？

Question

我想预先分配一个向量，然后写入它的切片，包括从 a 写入它TcpStream，它以 abuf: &mut [u8]作为参数。

// Create a vec with 256MB capacity
let mut myvec: Vec<u8> = Vec::with_capacity(268435456);

// Grow the vec to 256MB and initialize it with zeroes 
myvec.resize(268435456, 0x00);

// Try to get a mutable slice of the first 1kb of the vec
let body_slice: &mut [u8] = myvec[10..1034];

// Create a vec with 256MB capacity
let mut myvec: Vec<u8> = Vec::with_capacity(268435456);

// Grow the vec to 256MB and initialize it with zeroes 
myvec.resize(268435456, 0x00);

// Try to get a mutable slice of the first 1kb of the vec
let body_slice: &mut [u8] = myvec[10..1034];

Answer 1

你要这个：

let body_slice: &mut [u8] = &mut myvec[10..1034];