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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="Extension trait adding utility methods for subscriber initialization."><title>SubscriberInitExt in tracing_subscriber::util - 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-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.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 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" title="show sidebar"></button><a class="logo-container" href="../../tracing_subscriber/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_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_<wbr>subscriber</a><span class="version">0.3.19</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Subscriber<wbr>Init<wbr>Ext</a></h2><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.init" title="init">init</a></li><li><a href="#method.set_default" title="set_default">set_default</a></li><li><a href="#method.try_init" title="try_init">try_init</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>util</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_subscriber</a>::<wbr><a href="index.html">util</a></span><h1>Trait <span class="trait">SubscriberInitExt</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="../../src/tracing_subscriber/util.rs.html#23-93">Source</a> </span></div><pre class="rust item-decl"><code>pub trait SubscriberInitExt<div class="where">where
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Self: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>>,</div>{
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// Provided methods
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fn <a href="#method.set_default" class="fn">set_default</a>(self) -> <a class="struct" href="../../tracing_core/dispatcher/struct.DefaultGuard.html" title="struct tracing_core::dispatcher::DefaultGuard">DefaultGuard</a> { ... }
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<span class="item-spacer"></span> fn <a href="#method.try_init" class="fn">try_init</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="struct.TryInitError.html" title="struct tracing_subscriber::util::TryInitError">TryInitError</a>> { ... }
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<span class="item-spacer"></span> fn <a href="#method.init" class="fn">init</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>Extension trait adding utility methods for subscriber initialization.</p>
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<p>This trait provides extension methods to make configuring and setting a
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<a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">default subscriber</a> more ergonomic. It is automatically implemented for all
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types that can be converted into a <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html">trace dispatcher</a>. Since <code>Dispatch</code>
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implements <code>From<T></code> for all <code>T: Subscriber</code>, all <code>Subscriber</code>
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implementations will implement this extension trait as well. Types which
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can be converted into <code>Subscriber</code>s, such as builders that construct a
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<code>Subscriber</code>, may implement <code>Into<Dispatch></code>, and will also receive an
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implementation of this trait.</p>
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</div></details><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.set_default" class="method"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#38-43">Source</a><h4 class="code-header">fn <a href="#method.set_default" class="fn">set_default</a>(self) -> <a class="struct" href="../../tracing_core/dispatcher/struct.DefaultGuard.html" title="struct tracing_core::dispatcher::DefaultGuard">DefaultGuard</a></h4></section></summary><div class="docblock"><p>Sets <code>self</code> as the <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">default subscriber</a> in the current scope, returning a
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guard that will unset it when dropped.</p>
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<p>If the “tracing-log” feature flag is enabled, this will also initialize
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a <a href="https://crates.io/log"><code>log</code></a> compatibility layer. This allows the subscriber to consume
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<code>log::Record</code>s as though they were <code>tracing</code> <code>Event</code>s.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.try_init" class="method"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#58-74">Source</a><h4 class="code-header">fn <a href="#method.try_init" class="fn">try_init</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="struct.TryInitError.html" title="struct tracing_subscriber::util::TryInitError">TryInitError</a>></h4></section></summary><div class="docblock"><p>Attempts to set <code>self</code> as the <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">global default subscriber</a> in the current
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scope, returning an error if one is already set.</p>
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<p>If the “tracing-log” feature flag is enabled, this will also attempt to
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initialize a <a href="https://crates.io/log"><code>log</code></a> compatibility layer. This allows the subscriber to
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consume <code>log::Record</code>s as though they were <code>tracing</code> <code>Event</code>s.</p>
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<p>This method returns an error if a global default subscriber has already
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been set, or if a <code>log</code> logger has already been set (when the
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“tracing-log” feature is enabled).</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.init" class="method"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#89-92">Source</a><h4 class="code-header">fn <a href="#method.init" class="fn">init</a>(self)</h4></section></summary><div class="docblock"><p>Attempts to set <code>self</code> as the <a href="https://docs.rs/tracing/0.1.21/tracing/dispatcher/index.html#setting-the-default-subscriber">global default subscriber</a> in the current
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scope, panicking if this fails.</p>
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<p>If the “tracing-log” feature flag is enabled, this will also attempt to
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initialize a <a href="https://crates.io/log"><code>log</code></a> compatibility layer. This allows the subscriber to
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consume <code>log::Record</code>s as though they were <code>tracing</code> <code>Event</code>s.</p>
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<p>This method panics if a global default subscriber has already been set,
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or if a <code>log</code> logger has already been set (when the “tracing-log”
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feature is enabled).</p>
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</div></details></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.84.1/reference/items/traits.html#object-safety">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-SubscriberInitExt-for-T" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/util.rs.html#95">Source</a><a href="#impl-SubscriberInitExt-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.SubscriberInitExt.html" title="trait tracing_subscriber::util::SubscriberInitExt">SubscriberInitExt</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>>,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/util/trait.SubscriberInitExt.js" async></script></section></div></main></body></html> |