CODEWITHSUNDEEP
rust
Brady Dean
Brady Dean

Reputation: 3573

Expected &mut [u8] when calling Read::read

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() {}

I'm getting mismatched types:

<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);
                                                        ^~~~~~~~~~~~~~~~~~~~~

Upvotes: 0

Views: 5145

Answers (1)

krzysz00
krzysz00

Reputation: 2103

You need to use &mut received_message_buf instead of &.

&mut creates a mutable reference (so read() can put things into your buffer), while & creates an immutable reference.

Upvotes: 4

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