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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="Abstractions for creating `io::Write` instances."><title>tracing_subscriber::fmt::writer - 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="tracing_subscriber" 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="alternate icon" type="image/png" href="../../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod"><!--[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="../../../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_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">Module writer</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#types">Type Aliases</a></li></ul></section><h2><a href="../index.html">In tracing_subscriber::fmt</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="../../../tracing_subscriber/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>Module <a href="../../index.html">tracing_subscriber</a>::<wbr><a href="../index.html">fmt</a>::<wbr><a class="mod" href="#">writer</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/tracing_subscriber/fmt/writer.rs.html#1-1463">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Abstractions for creating <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a> instances.</p>
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</div></details><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.ArcWriter.html" title="struct tracing_subscriber::fmt::writer::ArcWriter">ArcWriter</a></div><div class="desc docblock-short">Implements <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>std::io::Write</code></a> for an <a href="https://doc.rust-lang.org/1.76.0/alloc/sync/struct.Arc.html" title="struct alloc::sync::Arc"><code>Arc</code></a><W> where <code>&W: Write</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.BoxMakeWriter.html" title="struct tracing_subscriber::fmt::writer::BoxMakeWriter">BoxMakeWriter</a></div><div class="desc docblock-short">A writer that erases the specific <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a> and <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> types being used.</div></li><li><div class="item-name"><a class="struct" href="struct.MutexGuardWriter.html" title="struct tracing_subscriber::fmt::writer::MutexGuardWriter">MutexGuardWriter</a></div><div class="desc docblock-short">A type implementing <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a> for a <a href="https://doc.rust-lang.org/1.76.0/std/sync/mutex/struct.MutexGuard.html" title="struct std::sync::mutex::MutexGuard"><code>MutexGuard</code></a> where the type
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inside the <a href="https://doc.rust-lang.org/1.76.0/std/sync/mutex/struct.Mutex.html" title="struct std::sync::mutex::Mutex"><code>Mutex</code></a> implements <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.OrElse.html" title="struct tracing_subscriber::fmt::writer::OrElse">OrElse</a></div><div class="desc docblock-short">Combines a <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that returns an <a href="type.OptionalWriter.html" title="type tracing_subscriber::fmt::writer::OptionalWriter"><code>OptionalWriter</code></a> with another
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<a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>, so that the second <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> is used when the first
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<a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> returns <a href="enum.EitherWriter.html#method.none" title="associated function tracing_subscriber::fmt::writer::EitherWriter::none"><code>OptionalWriter::none</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.Tee.html" title="struct tracing_subscriber::fmt::writer::Tee">Tee</a></div><div class="desc docblock-short">Combines two types implementing <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> (or <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>std::io::Write</code></a>) to
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produce a writer that writes to both <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>’s returned writers.</div></li><li><div class="item-name"><a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::writer::TestWriter">TestWriter</a></div><div class="desc docblock-short">A writer intended to support <a href="https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output"><code>libtest</code>’s output capturing</a> for use in unit tests.</div></li><li><div class="item-name"><a class="struct" href="struct.WithFilter.html" title="struct tracing_subscriber::fmt::writer::WithFilter">WithFilter</a></div><div class="desc docblock-short">A <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> combinator that wraps a <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> with a predicate for
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span and event <a href="../../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata"><code>Metadata</code></a>, so that the <a href="../trait.MakeWriter.html#method.make_writer_for" title="method tracing_subscriber::fmt::MakeWriter::make_writer_for"><code>MakeWriter::make_writer_for</code></a>
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method returns <a href="enum.EitherWriter.html#method.some" title="associated function tracing_subscriber::fmt::writer::EitherWriter::some"><code>OptionalWriter::some</code></a> when the predicate returns <code>true</code>,
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and <a href="enum.EitherWriter.html#method.none" title="associated function tracing_subscriber::fmt::writer::EitherWriter::none"><code>OptionalWriter::none</code></a> when the predicate returns <code>false</code>.</div></li><li><div class="item-name"><a class="struct" href="struct.WithMaxLevel.html" title="struct tracing_subscriber::fmt::writer::WithMaxLevel">WithMaxLevel</a></div><div class="desc docblock-short">A <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> combinator that only returns an enabled <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write">writer</a> for spans
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and events with metadata at or below a specified verbosity <a href="../../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level"><code>Level</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.WithMinLevel.html" title="struct tracing_subscriber::fmt::writer::WithMinLevel">WithMinLevel</a></div><div class="desc docblock-short">A <a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> combinator that only returns an enabled <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write">writer</a> for spans
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and events with metadata at or above a specified verbosity <a href="../../../tracing_core/metadata/struct.Level.html" title="struct tracing_core::metadata::Level"><code>Level</code></a>.</div></li></ul><h2 id="enums" class="section-header"><a href="#enums">Enums</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.EitherWriter.html" title="enum tracing_subscriber::fmt::writer::EitherWriter">EitherWriter</a></div><div class="desc docblock-short">A <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write">writer</a> that is one of two types implementing <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a>.</div></li></ul><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::writer::MakeWriter">MakeWriter</a></div><div class="desc docblock-short">A type that can create <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write"><code>io::Write</code></a> instances.</div></li><li><div class="item-name"><a class="trait" href="trait.MakeWriterExt.html" title="trait tracing_subscriber::fmt::writer::MakeWriterExt">MakeWriterExt</a></div><div class="desc docblock-short">Extension trait adding combinators for working with types implementing
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<a href="../trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>.</div></li></ul><h2 id="types" class="section-header"><a href="#types">Type Aliases</a></h2><ul class="item-table"><li><div class="item-name"><a class="type" href="type.OptionalWriter.html" title="type tracing_subscriber::fmt::writer::OptionalWriter">OptionalWriter</a></div><div class="desc docblock-short">A <a href="https://doc.rust-lang.org/1.76.0/std/io/trait.Write.html" title="trait std::io::Write">writer</a> which may or may not be enabled.</div></li></ul></section></div></main></body></html>
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