| <!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/tower-0.4.13/src/discover/list.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>list.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="../../../tower/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="../../../tower/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> |
| <span id="2">2</span> |
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| </pre><pre class="rust"><code><span class="kw">use super</span>::{error::Never, Change}; |
| <span class="kw">use </span>futures_core::Stream; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| <span class="kw">use </span>std::iter::{Enumerate, IntoIterator}; |
| <span class="kw">use </span>std::{ |
| pin::Pin, |
| task::{Context, Poll}, |
| }; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// Static service discovery based on a predetermined list of services. |
| /// |
| /// [`ServiceList`] is created with an initial list of services. The discovery |
| /// process will yield this list once and do nothing after. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ServiceList<T> |
| <span class="kw">where |
| </span>T: IntoIterator, |
| { |
| inner: Enumerate<T::IntoIter>, |
| } |
| } |
| |
| <span class="kw">impl</span><T, U> ServiceList<T> |
| <span class="kw">where |
| </span>T: IntoIterator<Item = U>, |
| { |
| <span class="attribute">#[allow(missing_docs)] |
| </span><span class="kw">pub fn </span>new<Request>(services: T) -> ServiceList<T> |
| <span class="kw">where |
| </span>U: Service<Request>, |
| { |
| ServiceList { |
| inner: services.into_iter().enumerate(), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, U> Stream <span class="kw">for </span>ServiceList<T> |
| <span class="kw">where |
| </span>T: IntoIterator<Item = U>, |
| { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Result</span><Change<usize, U>, Never>; |
| |
| <span class="kw">fn </span>poll_next(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> { |
| <span class="kw">match </span><span class="self">self</span>.project().inner.next() { |
| <span class="prelude-val">Some</span>((i, service)) => Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(Change::Insert(i, service)))), |
| <span class="prelude-val">None </span>=> Poll::Ready(<span class="prelude-val">None</span>), |
| } |
| } |
| } |
| |
| <span class="comment">// check that List can be directly over collections |
| </span><span class="attribute">#[cfg(test)] |
| #[allow(dead_code)] |
| </span><span class="kw">type </span>ListVecTest<T> = ServiceList<Vec<T>>; |
| |
| <span class="attribute">#[cfg(test)] |
| #[allow(dead_code)] |
| </span><span class="kw">type </span>ListVecIterTest<T> = ServiceList<::std::vec::IntoIter<T>>; |
| </code></pre></div> |
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