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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="The standard logging macro."><title>log in log - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.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-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="log" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></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="../log/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../log/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png" alt="logo"></a><h2><a href="../log/index.html">log</a><span class="version">0.4.22</span></h2></div><div class="sidebar-elems"></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"><h1>Macro <a href="index.html">log</a>::<wbr><a class="macro" href="#">log</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../src/log/macros.rs.html#31-60">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><span class="macro">macro_rules!</span> log {
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(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$key</span>:tt $(:<span class="macro-nonterminal">$capture</span>:tt)<span class="question-mark">? </span>$(= <span class="macro-nonterminal">$value</span>:expr)<span class="question-mark">?</span>),+; $(<span class="macro-nonterminal">$arg</span>:tt)+) => { ... };
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(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => { ... };
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(<span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => { ... };
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}</pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>The standard logging macro.</p>
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<p>This macro will generically log with the specified <code>Level</code> and <code>format!</code>
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based argument list.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>log::{log, Level};
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<span class="kw">let </span>data = (<span class="number">42</span>, <span class="string">"Forty-two"</span>);
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<span class="kw">let </span>private_data = <span class="string">"private"</span>;
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<span class="macro">log!</span>(Level::Error, <span class="string">"Received errors: {}, {}"</span>, data.<span class="number">0</span>, data.<span class="number">1</span>);
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<span class="macro">log!</span>(target: <span class="string">"app_events"</span>, Level::Warn, <span class="string">"App warning: {}, {}, {}"</span>,
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data.<span class="number">0</span>, data.<span class="number">1</span>, private_data);</code></pre></div>
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</div></details></section></div></main></body></html> |