小编cod*_*oob的帖子

我正在尝试在Rust中编写一个echo服务器.

use std::net::{TcpStream, TcpListener};
use std::io::prelude::*;

fn main() {
    let listener = TcpListener::bind("0.0.0.0:8000").unwrap();
    for stream in listener.incoming() {
        let stream = stream.unwrap();
        println!("A connection established");
        handle_connection(stream);
    }

}

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 512];

    stream.read(&mut buffer).unwrap();

    println!("Request: {}", String::from_utf8_lossy(&buffer[..]));
    stream.write(&buffer[..]).unwrap();
    stream.flush().unwrap();
}

第一个请求nc localhost 8000正在按预期工作,但后续请求不是.我究竟做错了什么？服务器如何读取客户端请求的问题是什么？虽然服务器端没有错误.

我通过在终端上输入数据来发送数据:

$ nc localhost 8000
hi
hi
hello
# no response
# on pressing enter
Ncat: Broken pipe.

Go 通道可用于在 goroutine 之间进行通信。类似地，yield 和 next 语法可用于在两个生成器之间进行通信。我的假设正确吗？如果不是，我哪里错了？

我正在尝试实现greps项目,我陷入了搜索功能.

fn search<'a, T>(query: &T, contents: &'a str) -> Vec<&'a str> {
    let mut results = Vec::new();

    for line in contents.lines() {
        if line.contains(query) {
            results.push(line);
        }
    }
    results
}

我收到此错误:

rustc 1.18.0 (03fc9d622 2017-06-06)
error[E0277]: the trait bound `T: std::ops::Fn<(char,)>` is not satisfied
  --> <anon>:39:17
   |
39 |         if line.contains(query) {
   |                 ^^^^^^^^ the trait `std::ops::Fn<(char,)>` is not implemented for `T`
   |
   = help: consider adding a `where T: std::ops::Fn<(char,)>` bound
   = note: required because of the requirements on …