read &mut [u8]调用Read::read

Question

use std::io::Read;
use std::net::TcpListener;

struct Server<'a> {
    ip_addr: &'a str,
}

impl<'a> Server<'a> {
    fn receive(&self) {
        let mut received_message_buf: [u8; 100];

        let tcp_listener = TcpListener::bind(self.ip_addr).unwrap();
        tcp_listener.accept().unwrap().0.read(&received_message_buf);
    }
}

fn main() {}

我得到了不匹配的类型：

<anon>:13:47: 13:68 error: mismatched types:
 expected `&mut [u8]`,
    found `&[u8; 100]`
(values differ in mutability) [E0308]
<anon>:13         tcp_listener.accept().unwrap().0.read(&received_message_buf);
                                                        ^~~~~~~~~~~~~~~~~~~~~

Answer 1

您需要使用&mut received_message_buf而不是&。

&mut创建一个可变引用(因此read()可以将内容放入缓冲区)，而&则创建一个不可变的引用。