Question

我正在尝试通过频道发送包含Cow<[u8]>的消息。但是，生命周期规则不允许我忽略它。

use std::borrow::Cow;
use std::sync::mpsc;

#[derive(Debug, Default, PartialEq, Clone)]
pub struct PlayerAction<'a> {
    pub data: Cow<'a, [u8]>,
}

#[derive(Debug, Clone)]
pub enum NetworkMessage<'a> {
    PlayerActionMessage(PlayerAction<'a>),
}

pub struct ConnectionsManager<'a> {
    channel: mpsc::Sender<NetworkMessage<'a>>,
}

pub struct MessageHandler<'a> {
    pub connection_manager: ConnectionsManager<'a>,
}

fn read_message<'a>(bytes: &'a Vec<u8>) -> NetworkMessage {
    NetworkMessage::PlayerActionMessage(PlayerAction {
        data: Cow::Borrowed(&bytes),
    })
}

impl<'a> MessageHandler<'a> {
    fn on_message(&mut self, msg: Vec<u8>) {
        let readm = read_message(&msg);
        self.connection_manager.channel.send(readm);
    }
}

fn main() {}

Playground

error[E0597]: `msg` does not live long enough
  --> src/main.rs:30:35
   |
30 |         let readm = read_message(&msg);
   |                                   ^^^ borrowed value does not live long enough
31 |         self.connection_manager.channel.send(readm);
32 |     }
   |     - borrowed value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the impl at 28:1...
  --> src/main.rs:28:1
   |
28 | impl<'a> MessageHandler<'a> {
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

MessageHandler比Vec<u8>寿命更长，但是我不知道如何通过其他任何方式传递它。

是否有任何方法可以传递Vec<u8>，使其比on_message函数的寿命更长？

变量的生存期不足以通过渠道发送

0 个答案: