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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="Sets the global logger to a `&'static Log`."><meta name="keywords" content="rust, rustlang, rust-lang, set_logger"><title>set_logger in log - Rust</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" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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<noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc fn"><!--[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="sidebar-logo" href="../log/index.html"><div class="logo-container"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png" alt="logo"></div>
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<img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png" alt="logo"></div>
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</a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In log</a></h2><div id="sidebar-vars" data-name="set_logger" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../log/index.html">
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<h1 class="fqn"><span class="in-band">Function <a href="index.html">log</a>::<wbr><a class="fn" href="#">set_logger</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/log/lib.rs.html#1465-1467">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn set_logger(logger: &'static dyn <a class="trait" href="trait.Log.html" title="trait log::Log">Log</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/core/primitive.unit.html">()</a>, <a class="struct" href="struct.SetLoggerError.html" title="struct log::SetLoggerError">SetLoggerError</a>></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Sets the global logger to a <code>&'static Log</code>.</p>
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<p>This function may only be called once in the lifetime of a program. Any log
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events that occur before the call to <code>set_logger</code> completes will be ignored.</p>
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<p>This function does not typically need to be called manually. Logger
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implementations should provide an initialization method that installs the
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logger internally.</p>
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<h2 id="availability"><a href="#availability">Availability</a></h2>
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<p>This method is available even when the <code>std</code> feature is disabled. However,
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it is currently unavailable on <code>thumbv6</code> targets, which lack support for
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some atomic operations which are used by this function. Even on those
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targets, <a href="fn.set_logger_racy.html"><code>set_logger_racy</code></a> will be available.</p>
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<h2 id="errors"><a href="#errors">Errors</a></h2>
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<p>An error is returned if a logger has already been set.</p>
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<h2 id="examples"><a href="#examples">Examples</a></h2>
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<div class='information'><div class='tooltip edition' data-edition="2018">ⓘ</div></div><div class="example-wrap"><pre class="rust rust-example-rendered edition"><code><span class="kw">use</span> <span class="ident">log</span>::{<span class="ident">error</span>, <span class="ident">info</span>, <span class="ident">warn</span>, <span class="ident">Record</span>, <span class="ident">Level</span>, <span class="ident">Metadata</span>, <span class="ident">LevelFilter</span>};
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<span class="kw">static</span> <span class="ident">MY_LOGGER</span>: <span class="ident">MyLogger</span> <span class="op">=</span> <span class="ident">MyLogger</span>;
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<span class="kw">struct</span> <span class="ident">MyLogger</span>;
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<span class="kw">impl</span> <span class="ident">log::Log</span> <span class="kw">for</span> <span class="ident">MyLogger</span> {
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<span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">metadata</span>: <span class="kw-2">&</span><span class="ident">Metadata</span>) -> <span class="ident">bool</span> {
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<span class="ident">metadata</span>.<span class="ident">level</span>() <span class="op"><</span><span class="op">=</span> <span class="ident">Level::Info</span>
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}
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<span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">record</span>: <span class="kw-2">&</span><span class="ident">Record</span>) {
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<span class="kw">if</span> <span class="self">self</span>.<span class="ident">enabled</span>(<span class="ident">record</span>.<span class="ident">metadata</span>()) {
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<span class="macro">println!</span>(<span class="string">"{} - {}"</span>, <span class="ident">record</span>.<span class="ident">level</span>(), <span class="ident">record</span>.<span class="ident">args</span>());
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}
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}
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<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="self">self</span>) {}
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}
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<span class="ident">log::set_logger</span>(<span class="kw-2">&</span><span class="ident">MY_LOGGER</span>).<span class="ident">unwrap</span>();
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<span class="ident">log::set_max_level</span>(<span class="ident">LevelFilter::Info</span>);
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<span class="macro">info!</span>(<span class="string">"hello log"</span>);
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<span class="macro">warn!</span>(<span class="string">"warning"</span>);
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<span class="macro">error!</span>(<span class="string">"oops"</span>);</code></pre></div>
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