| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/async-stream-0.3.5/src/next.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>next.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../async_stream/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../async_stream/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>futures_core::Stream; |
| <span class="kw">use </span>std::future::Future; |
| <span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| |
| <span class="comment">// This is equivalent to the `futures::StreamExt::next` method. |
| // But we want to make this crate dependency as small as possible, so we define our `next` function. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub fn </span>next<S>(stream: <span class="kw-2">&mut </span>S) -> <span class="kw">impl </span>Future<Output = <span class="prelude-ty">Option</span><S::Item>> + <span class="lifetime">'_ |
| </span><span class="kw">where |
| </span>S: Stream + Unpin, |
| { |
| Next { stream } |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>Next<<span class="lifetime">'a</span>, S> { |
| stream: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>S, |
| } |
| |
| <span class="kw">impl</span><S> Unpin <span class="kw">for </span>Next<<span class="lifetime">'_</span>, S> <span class="kw">where </span>S: Unpin {} |
| |
| <span class="kw">impl</span><S> Future <span class="kw">for </span>Next<<span class="lifetime">'_</span>, S> |
| <span class="kw">where |
| </span>S: Stream + Unpin, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Option</span><S::Item>; |
| |
| <span class="kw">fn </span>poll(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="self">Self</span>::Output> { |
| Pin::new(<span class="kw-2">&mut </span><span class="self">self</span>.stream).poll_next(cx) |
| } |
| } |
| </code></pre></div> |
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