| <!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-layer-0.3.2/src/stack.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>stack.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_layer/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_layer/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">super</span>::Layer; |
| <span class="kw">use </span>std::fmt; |
| |
| <span class="doccomment">/// Two middlewares chained together. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>Stack<Inner, Outer> { |
| inner: Inner, |
| outer: Outer, |
| } |
| |
| <span class="kw">impl</span><Inner, Outer> Stack<Inner, Outer> { |
| <span class="doccomment">/// Create a new `Stack`. |
| </span><span class="kw">pub fn </span>new(inner: Inner, outer: Outer) -> <span class="self">Self </span>{ |
| Stack { inner, outer } |
| } |
| } |
| |
| <span class="kw">impl</span><S, Inner, Outer> Layer<S> <span class="kw">for </span>Stack<Inner, Outer> |
| <span class="kw">where |
| </span>Inner: Layer<S>, |
| Outer: Layer<Inner::Service>, |
| { |
| <span class="kw">type </span>Service = Outer::Service; |
| |
| <span class="kw">fn </span>layer(<span class="kw-2">&</span><span class="self">self</span>, service: S) -> <span class="self">Self</span>::Service { |
| <span class="kw">let </span>inner = <span class="self">self</span>.inner.layer(service); |
| |
| <span class="self">self</span>.outer.layer(inner) |
| } |
| } |
| |
| <span class="kw">impl</span><Inner, Outer> fmt::Debug <span class="kw">for </span>Stack<Inner, Outer> |
| <span class="kw">where |
| </span>Inner: fmt::Debug, |
| Outer: fmt::Debug, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <span class="comment">// The generated output of nested `Stack`s is very noisy and makes |
| // it harder to understand what is in a `ServiceBuilder`. |
| // |
| // Instead, this output is designed assuming that a `Stack` is |
| // usually quite nested, and inside a `ServiceBuilder`. Therefore, |
| // this skips using `f.debug_struct()`, since each one would force |
| // a new layer of indentation. |
| // |
| // - In compact mode, a nested stack ends up just looking like a flat |
| // list of layers. |
| // |
| // - In pretty mode, while a newline is inserted between each layer, |
| // the `DebugStruct` used in the `ServiceBuilder` will inject padding |
| // to that each line is at the same indentation level. |
| // |
| // Also, the order of [outer, inner] is important, since it reflects |
| // the order that the layers were added to the stack. |
| </span><span class="kw">if </span>f.alternate() { |
| <span class="comment">// pretty |
| </span><span class="macro">write!</span>(f, <span class="string">"{:#?},\n{:#?}"</span>, <span class="self">self</span>.outer, <span class="self">self</span>.inner) |
| } <span class="kw">else </span>{ |
| <span class="macro">write!</span>(f, <span class="string">"{:?}, {:?}"</span>, <span class="self">self</span>.outer, <span class="self">self</span>.inner) |
| } |
| } |
| } |
| </code></pre></div> |
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