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<!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="Concatenates literals into a byte slice."><title>concat_bytes in tracing::stdlib - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-46132b98.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing" data-themes="" data-resource-suffix="" data-rustdoc-version="1.85.0 (4d91de4e4 2025-02-17)" data-channel="1.85.0" data-search-js="search-75f5ac3e.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing/index.html">tracing</a><span class="version">0.1.41</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">concat_<wbr>bytes</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing::<wbr>stdlib</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../index.html">tracing</a>::<wbr><a href="index.html">stdlib</a></span><h1>Macro <span class="macro">concat_bytes</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="https://doc.rust-lang.org/1.85.0/src/core/macros/mod.rs.html#1196">Source</a> </span></div><pre class="rust item-decl"><code>macro_rules! concat_bytes {
($($e:literal),+ $(,)?) => { ... };
}</code></pre><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>concat_bytes</code> <a href="https://github.com/tokio-rs/tracing/issues/87555">#87555</a>)</span></div></span><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Concatenates literals into a byte slice.</p>
<p>This macro takes any number of comma-separated literals, and concatenates them all into
one, yielding an expression of type <code>&[u8; _]</code>, which represents all of the literals
concatenated left-to-right. The literals passed can be any combination of:</p>
<ul>
<li>byte literals (<code>b'r'</code>)</li>
<li>byte strings (<code>b"Rust"</code>)</li>
<li>arrays of bytes/numbers (<code>[b'A', 66, b'C']</code>)</li>
</ul>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(concat_bytes)]
</span><span class="kw">let </span>s: <span class="kw-2">&</span>[u8; <span class="number">6</span>] = <span class="macro">concat_bytes!</span>(<span class="string">b'A'</span>, <span class="string">b"BC"</span>, [<span class="number">68</span>, <span class="string">b'E'</span>, <span class="number">70</span>]);
<span class="macro">assert_eq!</span>(s, <span class="string">b"ABCDEF"</span>);</code></pre></div>
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