tokio::net::TcpStream 如何实现 tokio::prelude::Stream? [英] How does tokio::net::TcpStream implement tokio::prelude::Stream?

问题描述

在 tokio.rs 文档中，我们看到以下片段

In the tokio.rs docs we see the following snippet

// split the socket stream into readable and writable parts
let (reader, writer) = socket.split();
// copy bytes from the reader into the writer
let amount = io::copy(reader, writer);

我假设 split 确实是 Stream::split，但我无法弄清楚这个特性如何应用于 TcpStream 鉴于流页面没有提到 TcpStream 和副反之.

I am assuming that split is indeed Stream::split, but I can't figure out how this trait applies to TcpStream given that the stream page doesn't mention TcpStream and vice versa.

推荐答案

tokio::net::TcpStream 实现了 AsyncRead.

AsyncRead 提供的方法之一是 split():

One of the provided methods from AsyncRead is split():

fn split(self) -> (ReadHalf<Self>, WriteHalf<Self>)
where
    Self: AsyncWrite, 

所以在这种情况下，它不是 Stream::split 作为您的问题所建议的，因为根据您的观察 tokio::net::TcpStream 不是实现者Stream.

So in this case it isn't Stream::split as your question suggested because as per your observation tokio::net::TcpStream isn't an implementor of Stream.

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