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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="A trait encapsulating the operations required of a logger."><title>Log in log - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.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="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc trait"><!--[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">☰</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">0.4.20</span></h2></div><h2 class="location"><a href="#">Log</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.enabled">enabled</a></li><li><a href="#tymethod.flush">flush</a></li><li><a href="#tymethod.log">log</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Log-for-%26T">&T</a></li><li><a href="#impl-Log-for-Arc%3CT%3E">Arc<T></a></li><li><a href="#impl-Log-for-Box%3CT%3E">Box<T></a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate log</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../log/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">log</a>::<wbr><a class="trait" href="#">Log</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/log/lib.rs.html#1128-1154">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait Log: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> {
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// Required methods
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fn <a href="#tymethod.enabled" class="fn">enabled</a>(&self, metadata: &<a class="struct" href="struct.Metadata.html" title="struct log::Metadata">Metadata</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>;
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<span class="item-spacer"></span> fn <a href="#tymethod.log" class="fn">log</a>(&self, record: &<a class="struct" href="struct.Record.html" title="struct log::Record">Record</a><'_>);
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<span class="item-spacer"></span> fn <a href="#tymethod.flush" class="fn">flush</a>(&self);
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A trait encapsulating the operations required of a logger.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.enabled" class="method"><a class="src rightside" href="../src/log/lib.rs.html#1141">source</a><h4 class="code-header">fn <a href="#tymethod.enabled" class="fn">enabled</a>(&self, metadata: &<a class="struct" href="struct.Metadata.html" title="struct log::Metadata">Metadata</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Determines if a log message with the specified metadata would be
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logged.</p>
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<p>This is used by the <code>log_enabled!</code> macro to allow callers to avoid
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expensive computation of log message arguments if the message would be
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discarded anyway.</p>
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<h5 id="for-implementors"><a href="#for-implementors">For implementors</a></h5>
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<p>This method isn’t called automatically by the <code>log!</code> macros.
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It’s up to an implementation of the <code>Log</code> trait to call <code>enabled</code> in its own
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<code>log</code> method implementation to guarantee that filtering is applied.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.log" class="method"><a class="src rightside" href="../src/log/lib.rs.html#1150">source</a><h4 class="code-header">fn <a href="#tymethod.log" class="fn">log</a>(&self, record: &<a class="struct" href="struct.Record.html" title="struct log::Record">Record</a><'_>)</h4></section></summary><div class="docblock"><p>Logs the <code>Record</code>.</p>
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<h5 id="for-implementors-1"><a href="#for-implementors-1">For implementors</a></h5>
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<p>Note that <code>enabled</code> is <em>not</em> necessarily called before this method.
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Implementations of <code>log</code> should perform all necessary filtering
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internally.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.flush" class="method"><a class="src rightside" href="../src/log/lib.rs.html#1153">source</a><h4 class="code-header">fn <a href="#tymethod.flush" class="fn">flush</a>(&self)</h4></section></summary><div class="docblock"><p>Flushes any buffered records.</p>
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</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-Log-for-%26T" class="impl"><a class="src rightside" href="../src/log/lib.rs.html#1168-1182">source</a><a href="#impl-Log-for-%26T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&T</a><div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a>,</div></h3></section></summary><div class="impl-items"><section id="method.enabled" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1172-1174">source</a><a href="#method.enabled" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.enabled" class="fn">enabled</a>(&self, metadata: &<a class="struct" href="struct.Metadata.html" title="struct log::Metadata">Metadata</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section><section id="method.log" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1176-1178">source</a><a href="#method.log" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.log" class="fn">log</a>(&self, record: &<a class="struct" href="struct.Record.html" title="struct log::Record">Record</a><'_>)</h4></section><section id="method.flush" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1179-1181">source</a><a href="#method.flush" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.flush" class="fn">flush</a>(&self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Log-for-Box%3CT%3E" class="impl"><a class="src rightside" href="../src/log/lib.rs.html#1185-1199">source</a><a href="#impl-Log-for-Box%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><T><div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a>,</div></h3></section></summary><div class="impl-items"><section id="method.enabled-1" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1189-1191">source</a><a href="#method.enabled-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.enabled" class="fn">enabled</a>(&self, metadata: &<a class="struct" href="struct.Metadata.html" title="struct log::Metadata">Metadata</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section><section id="method.log-1" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1193-1195">source</a><a href="#method.log-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.log" class="fn">log</a>(&self, record: &<a class="struct" href="struct.Record.html" title="struct log::Record">Record</a><'_>)</h4></section><section id="method.flush-1" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1196-1198">source</a><a href="#method.flush-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.flush" class="fn">flush</a>(&self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Log-for-Arc%3CT%3E" class="impl"><a class="src rightside" href="../src/log/lib.rs.html#1202-1216">source</a><a href="#impl-Log-for-Arc%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/sync/struct.Arc.html" title="struct alloc::sync::Arc">Arc</a><T><div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a>,</div></h3></section></summary><div class="impl-items"><section id="method.enabled-2" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1206-1208">source</a><a href="#method.enabled-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.enabled" class="fn">enabled</a>(&self, metadata: &<a class="struct" href="struct.Metadata.html" title="struct log::Metadata">Metadata</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section><section id="method.log-2" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1210-1212">source</a><a href="#method.log-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.log" class="fn">log</a>(&self, record: &<a class="struct" href="struct.Record.html" title="struct log::Record">Record</a><'_>)</h4></section><section id="method.flush-2" class="method trait-impl"><a class="src rightside" href="../src/log/lib.rs.html#1213-1215">source</a><a href="#method.flush-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.flush" class="fn">flush</a>(&self)</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/log/trait.Log.js" data-ignore-extern-crates="alloc" async></script></section></div></main></body></html>
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