| <!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/tokio-stream-0.1.14/src/stream_ext/try_next.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>try_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="../../../tokio_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="../../../tokio_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><span class="kw">crate</span>::stream_ext::Next; |
| <span class="kw">use </span><span class="kw">crate</span>::Stream; |
| |
| <span class="kw">use </span>core::future::Future; |
| <span class="kw">use </span>core::marker::PhantomPinned; |
| <span class="kw">use </span>core::pin::Pin; |
| <span class="kw">use </span>core::task::{Context, Poll}; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// Future for the [`try_next`](super::StreamExt::try_next) method. |
| /// |
| /// # Cancel safety |
| /// |
| /// This method is cancel safe. It only |
| /// holds onto a reference to the underlying stream, |
| /// so dropping it will never lose a value. |
| </span><span class="attribute">#[derive(Debug)] |
| #[must_use = <span class="string">"futures do nothing unless you `.await` or poll them"</span>] |
| </span><span class="kw">pub struct </span>TryNext<<span class="lifetime">'a</span>, St: <span class="question-mark">?</span>Sized> { |
| <span class="attribute">#[pin] |
| </span>inner: Next<<span class="lifetime">'a</span>, St>, |
| <span class="comment">// Make this future `!Unpin` for compatibility with async trait methods. |
| </span><span class="attribute">#[pin] |
| </span>_pin: PhantomPinned, |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, St: <span class="question-mark">?</span>Sized> TryNext<<span class="lifetime">'a</span>, St> { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(stream: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>St) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| inner: Next::new(stream), |
| _pin: PhantomPinned, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, E, St: <span class="question-mark">?</span>Sized + Stream<Item = <span class="prelude-ty">Result</span><T, E>> + Unpin> Future <span class="kw">for </span>TryNext<<span class="lifetime">'_</span>, St> { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><T>, E>; |
| |
| <span class="kw">fn </span>poll(<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> { |
| <span class="kw">let </span>me = <span class="self">self</span>.project(); |
| me.inner.poll(cx).map(Option::transpose) |
| } |
| } |
| </code></pre></div> |
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