问题描述
我有一个包含RefCell
的结构,该结构包装了Tlsstream<Tcpstream>
。我测试了将Tlsstream<IO>
替换为i32
并能够变异struct成员,但是使用流时编译器错误。尝试写入时出现以下错误:
error[E0596]: cannot borrow data in a `&` reference as mutable
--> src/main.rs:18:9
|
18 | / self.i
19 | | .tcp4_stream
20 | | .borrow_mut()
21 | | .as_ref()
22 | | .unwrap()
| |_____________________^ cannot borrow as mutable
MCVE:
[package]
name = "mvce"
version = "0.1.0"
authors = ["Joshua Abraham <sinisterpatrician@gmail.com>"]
edition = "2018"
# See more keys and their deFinitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
async-std = "1.6.3"
async-tls = "0.9.0"
use async_std::net::Tcpstream;
use async_std::prelude::*;
use async_tls::client::Tlsstream;
use std::{cell::RefCell,rc::Rc};
#[derive(Default,Clone)]
struct Client {
i: Rc<ClientInternal>,}
#[derive(Default)]
struct ClientInternal {
tcp4_stream: RefCell<Option<Tlsstream<Tcpstream>>>,}
impl Client {
async fn send(&self) {
self.i
.tcp4_stream
.borrow_mut()
.as_ref()
.unwrap()
.write_all(b"Hello World!")
.await;
}
}
fn main() {
println!("Hello,world!");
}
如何在这里利用内部可变性?
解决方法
暂无找到可以解决该程序问题的有效方法,小编努力寻找整理中!
如果你已经找到好的解决方法,欢迎将解决方案带上本链接一起发送给小编。
小编邮箱:dio#foxmail.com (将#修改为@)