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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `set_logger` fn in crate `log`."><metaname="keywords"content="rust, rustlang, rust-lang, set_logger"><title>log::set_logger - Rust</title><linkrel="stylesheet"type="text/css"href="../normalize.css"><linkrel="stylesheet"type="text/css"href="../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../dark.css"><linkrel="stylesheet"type="text/css"href="../light.css"id="themeStyle"><scriptsrc="../storage.js"></script><noscript><linkrel="stylesheet"href="../noscript.css"></noscript><linkrel="shortcut icon"href="https://www.rust-lang.org/favicon.ico"><styletype="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><bodyclass="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../log/index.html'><divclass='logo-container'><imgsrc='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png'alt='logo'></div></a><divclass="sidebar-elems"><pclass='location'><ahref='index.html'>log</a></p><script>window.sidebarCurrent={name:'set_logger',ty:'fn',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../settings.html"><imgsrc="../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../src/log/lib.rs.html#701-704'title='goto source code'>[src]</a></span><spanclass='in-band'>Function <ahref='index.html'>log</a>::<wbr><aclass="fn"href=''>set_logger</a></span></h1><preclass='rust fn'>pub fn set_logger<M>(make_logger: M) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <aclass="struct"href="../log/struct.SetLoggerError.html"title="struct log::SetLoggerError">SetLoggerError</a>><spanclass="where fmt-newline">where<br> M: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html"title="trait core::ops::function::FnOnce">FnOnce</a>(<aclass="struct"href="../log/struct.MaxLogLevelFilter.html"title="struct log::MaxLogLevelFilter">MaxLogLevelFilter</a>) -><aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html"title="struct alloc::boxed::Box">Box</a><dyn <aclass="trait"href="../log/trait.Log.html"title="trait log::Log">Log</a>>, </span></pre><divclass='docblock'><p>Sets the global logger.</p>
<p>The <code>make_logger</code> closure is passed a <code>MaxLogLevel</code> object, which the
logger should use to keep the global maximum log level in sync with the
highest log level that the logger will not ignore.</p>
<p>This function may only be called once in the lifetime of a program. Any log
events that occur before the call to <code>set_logger</code> completes will be
ignored.</p>
<p>This function does not typically need to be called manually. Logger
implementations should provide an initialization method that calls
<code>set_logger</code> internally.</p>
<p>Requires the <code>use_std</code> feature (enabled by default).</p>
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