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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="`MakeVisitor` wrappers for working with `fmt::Debug` fields."><title>tracing_subscriber::field::debug - 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 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" 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="#">Module debug</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Module <span>debug</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/field/debug.rs.html#1-111">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>MakeVisitor</code> wrappers for working with <code>fmt::Debug</code> fields.</p>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a></div><div class="desc docblock-short">A visitor wrapper that ensures any <code>fmt::Debug</code> fields are formatted using
the alternate (<code>:#</code>) formatter.</div></li></ul></section></div></main></body></html>

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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 `MakeVisitor` wrapper that separates formatted fields with a delimiter."><title>tracing_subscriber::field::delimited - 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 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" 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="#">Module delimited</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Module <span>delimited</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/field/delimited.rs.html#1-184">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A <code>MakeVisitor</code> wrapper that separates formatted fields with a delimiter.</p>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Delimited.html" title="struct tracing_subscriber::field::delimited::Delimited">Delimited</a></div><div class="desc docblock-short">A <code>MakeVisitor</code> wrapper that wraps a visitor that writes formatted output so
that a delimiter is inserted between writing formatted field values.</div></li><li><div class="item-name"><a class="struct" href="struct.VisitDelimited.html" title="struct tracing_subscriber::field::delimited::VisitDelimited">Visit<wbr>Delimited</a></div><div class="desc docblock-short">A visitor wrapper that inserts a delimiter after the wrapped visitor formats
a field value.</div></li></ul></section></div></main></body></html>

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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="`MakeVisitor` wrappers for working with `fmt::Display` fields."><title>tracing_subscriber::field::display - 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 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" 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="#">Module display</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Module <span>display</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/field/display.rs.html#1-117">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>MakeVisitor</code> wrappers for working with <code>fmt::Display</code> fields.</p>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a></div><div class="desc docblock-short">A visitor wrapper that ensures any strings named “message” are formatted
using <code>fmt::Display</code></div></li></ul></section></div></main></body></html>

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</div></details><h2 id="modules" class="section-header">Modules<a href="#modules" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="debug/index.html" title="mod tracing_subscriber::field::debug">debug</a></div><div class="desc docblock-short"><code>MakeVisitor</code> wrappers for working with <code>fmt::Debug</code> fields.</div></li><li><div class="item-name"><a class="mod" href="delimited/index.html" title="mod tracing_subscriber::field::delimited">delimited</a></div><div class="desc docblock-short">A <code>MakeVisitor</code> wrapper that separates formatted fields with a delimiter.</div></li><li><div class="item-name"><a class="mod" href="display/index.html" title="mod tracing_subscriber::field::display">display</a></div><div class="desc docblock-short"><code>MakeVisitor</code> wrappers for working with <code>fmt::Display</code> fields.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.MakeExt.html" title="trait tracing_subscriber::field::MakeExt">MakeExt</a></div><div class="desc docblock-short">Extension trait providing <code>MakeVisitor</code> combinators.</div></li><li><div class="item-name"><a class="trait" href="trait.MakeOutput.html" title="trait tracing_subscriber::field::MakeOutput">Make<wbr>Output</a></div><div class="desc docblock-short">Extension trait implemented for all <code>MakeVisitor</code> implementations that
produce a visitor implementing <code>VisitOutput</code>.</div></li><li><div class="item-name"><a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">Make<wbr>Visitor</a></div><div class="desc docblock-short">Creates new <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitors</a>.</div></li><li><div class="item-name"><a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">Record<wbr>Fields</a></div><div class="desc docblock-short">Extension trait implemented by types which can be recorded by a <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a>.</div></li><li><div class="item-name"><a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a></div><div class="desc docblock-short">Visits typed values.</div></li><li><div class="item-name"><a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">Visit<wbr>Fmt</a></div><div class="desc docblock-short">Extension trait implemented by visitors to indicate that they write to a
<code>fmt::Write</code> instance, and allow access to that writer.</div></li><li><div class="item-name"><a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">Visit<wbr>Output</a></div><div class="desc docblock-short">A <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a> that produces output once it has visited a set of fields.</div></li><li><div class="item-name"><a class="trait" href="trait.VisitWrite.html" title="trait tracing_subscriber::field::VisitWrite">Visit<wbr>Write</a></div><div class="desc docblock-short">Extension trait implemented by visitors to indicate that they write to an
<code>io::Write</code> instance, and allow access to that writer.</div></li></ul></section></div></main></body></html>

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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 providing `MakeVisitor` combinators."><title>MakeExt in tracing_subscriber::field - 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="#">MakeExt</a></h2><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.debug_alt" title="debug_alt">debug_alt</a></li><li><a href="#method.delimited" title="delimited">delimited</a></li><li><a href="#method.display_messages" title="display_messages">display_messages</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>field</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">field</a></span><h1>Trait <span class="trait">MakeExt</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/field/mod.rs.html#130-156">Source</a> </span></div><pre class="rust item-decl"><code>pub trait MakeExt&lt;T&gt;<div class="where">where
Self: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + Sealed&lt;MakeExtMarker&lt;T&gt;&gt;,</div>{
// Provided methods
fn <a href="#method.debug_alt" class="fn">debug_alt</a>(self) -&gt; <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;Self&gt; { ... }
<span class="item-spacer"></span> fn <a href="#method.display_messages" class="fn">display_messages</a>(self) -&gt; <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;Self&gt; { ... }
<span class="item-spacer"></span> fn <a href="#method.delimited" class="fn">delimited</a>&lt;D&gt;(self, delimiter: D) -&gt; <a class="struct" href="delimited/struct.Delimited.html" title="struct tracing_subscriber::field::delimited::Delimited">Delimited</a>&lt;D, Self&gt;
<span class="where">where D: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
Self::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a></span> { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait providing <code>MakeVisitor</code> combinators.</p>
</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.debug_alt" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#137-139">Source</a><h4 class="code-header">fn <a href="#method.debug_alt" class="fn">debug_alt</a>(self) -&gt; <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;Self&gt;</h4></section></summary><div class="docblock"><p>Wraps <code>self</code> so that any <code>fmt::Debug</code> fields are recorded using the
alternate formatter (<code>{:#?}</code>).</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.display_messages" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#143-145">Source</a><h4 class="code-header">fn <a href="#method.display_messages" class="fn">display_messages</a>(self) -&gt; <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;Self&gt;</h4></section></summary><div class="docblock"><p>Wraps <code>self</code> so that any string fields named “message” are recorded
using <code>fmt::Display</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.delimited" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#149-155">Source</a><h4 class="code-header">fn <a href="#method.delimited" class="fn">delimited</a>&lt;D&gt;(self, delimiter: D) -&gt; <a class="struct" href="delimited/struct.Delimited.html" title="struct tracing_subscriber::field::delimited::Delimited">Delimited</a>&lt;D, Self&gt;<div class="where">where
D: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
Self::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,</div></h4></section></summary><div class="docblock"><p>Wraps <code>self</code> so that when fields are formatted to a writer, they are
separated by the provided <code>delimiter</code>.</p>
</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-MakeExt%3CT%3E-for-M" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#220-225">Source</a><a href="#impl-MakeExt%3CT%3E-for-M" class="anchor">§</a><h3 class="code-header">impl&lt;T, M&gt; <a class="trait" href="trait.MakeExt.html" title="trait tracing_subscriber::field::MakeExt">MakeExt</a>&lt;T&gt; for M<div class="where">where
M: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + Sealed&lt;MakeExtMarker&lt;T&gt;&gt;,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/field/trait.MakeExt.js" async></script></section></div></main></body></html>

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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 implemented for all `MakeVisitor` implementations that produce a visitor implementing `VisitOutput`."><title>MakeOutput in tracing_subscriber::field - 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="#">Make<wbr>Output</a></h2><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.visit_with" title="visit_with">visit_with</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>field</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">field</a></span><h1>Trait <span class="trait">MakeOutput</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/field/mod.rs.html#95-108">Source</a> </span></div><pre class="rust item-decl"><code>pub trait MakeOutput&lt;T, Out&gt;<div class="where">where
Self: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; + Sealed&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.tuple.html">(T, Out)</a>&gt;,
Self::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>: <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;Out&gt;,</div>{
// Provided method
fn <a href="#method.visit_with" class="fn">visit_with</a>&lt;F&gt;(&amp;self, target: T, fields: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;F</a>) -&gt; Out
<span class="where">where F: <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a></span> { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait implemented for all <code>MakeVisitor</code> implementations that
produce a visitor implementing <code>VisitOutput</code>.</p>
</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.visit_with" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#102-107">Source</a><h4 class="code-header">fn <a href="#method.visit_with" class="fn">visit_with</a>&lt;F&gt;(&amp;self, target: T, fields: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;F</a>) -&gt; Out<div class="where">where
F: <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>,</div></h4></section></summary><div class="docblock"><p>Visits all fields in <code>fields</code> with a new visitor constructed from
<code>target</code>.</p>
</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-MakeOutput%3CT,+Out%3E-for-M" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#211-216">Source</a><a href="#impl-MakeOutput%3CT,+Out%3E-for-M" class="anchor">§</a><h3 class="code-header">impl&lt;T, Out, M&gt; <a class="trait" href="trait.MakeOutput.html" title="trait tracing_subscriber::field::MakeOutput">MakeOutput</a>&lt;T, Out&gt; for M<div class="where">where
M: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;,
M::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>: <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;Out&gt;,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/field/trait.MakeOutput.js" async></script></section></div></main></body></html>

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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="Creates new visitors."><title>MakeVisitor in tracing_subscriber::field - 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="#">Make<wbr>Visitor</a></h2><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Visitor" title="Visitor">Visitor</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.make_visitor" title="make_visitor">make_visitor</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Trait <span class="trait">MakeVisitor</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/field/mod.rs.html#26-32">Source</a> </span></div><pre class="rust item-decl"><code>pub trait MakeVisitor&lt;T&gt; {
type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a>: <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>;
// Required method
fn <a href="#tymethod.make_visitor" class="fn">make_visitor</a>(&amp;self, target: T) -&gt; Self::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Creates new <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitors</a>.</p>
<p>A type implementing <code>MakeVisitor</code> represents a composable factory for types
implementing the <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit"><code>Visit</code> trait</a>. The <code>MakeVisitor</code> trait defines
a single function, <code>make_visitor</code>, which takes in a <code>T</code>-typed <code>target</code> and
returns a type implementing <code>Visit</code> configured for that target. A target may
be a string, output stream, or data structure that the visitor will record
data to, configuration variables that determine the visitor’s behavior, or
<code>()</code> when no input is required to produce a visitor.</p>
</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Visitor" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#28">Source</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a>: <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a></h4></section></summary><div class="docblock"><p>The visitor type produced by this <code>MakeVisitor</code>.</p>
</div></details></div><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.make_visitor" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#31">Source</a><h4 class="code-header">fn <a href="#tymethod.make_visitor" class="fn">make_visitor</a>(&amp;self, target: T) -&gt; Self::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a></h4></section></summary><div class="docblock"><p>Make a new visitor for the provided <code>target</code>.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-DefaultFields" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1205-1212">Source</a><a href="#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-DefaultFields" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;<a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;&gt; for <a class="struct" href="../fmt/format/struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1206">Source</a><a href="#associatedtype.Visitor-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="../fmt/format/struct.DefaultVisitor.html" title="struct tracing_subscriber::fmt::format::DefaultVisitor">DefaultVisitor</a>&lt;'a&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-PrettyFields" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/pretty.rs.html#387-397">Source</a><a href="#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-PrettyFields" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;<a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;&gt; for <a class="struct" href="../fmt/format/struct.PrettyFields.html" title="struct tracing_subscriber::fmt::format::PrettyFields">PrettyFields</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/pretty.rs.html#388">Source</a><a href="#associatedtype.Visitor-2" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="../fmt/format/struct.PrettyVisitor.html" title="struct tracing_subscriber::fmt::format::PrettyVisitor">PrettyVisitor</a>&lt;'a&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-FieldFn%3CF%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1525-1538">Source</a><a href="#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-FieldFn%3CF%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, F&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;<a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;&gt; for <a class="struct" href="../fmt/format/struct.FieldFn.html" title="struct tracing_subscriber::fmt::format::FieldFn">FieldFn</a>&lt;F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&amp;mut <a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;, &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/1.84.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a> + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-3" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1529">Source</a><a href="#associatedtype.Visitor-3" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="../fmt/format/struct.FieldFnVisitor.html" title="struct tracing_subscriber::fmt::format::FieldFnVisitor">FieldFnVisitor</a>&lt;'a, F&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CT%3E-for-Delimited%3CD,+V%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/delimited.rs.html#27-38">Source</a><a href="#impl-MakeVisitor%3CT%3E-for-Delimited%3CD,+V%3E" class="anchor">§</a><h3 class="code-header">impl&lt;D, V, T&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; for <a class="struct" href="delimited/struct.Delimited.html" title="struct tracing_subscriber::field::delimited::Delimited">Delimited</a>&lt;D, V&gt;<div class="where">where
D: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
V: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;,
V::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-4" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/delimited.rs.html#33">Source</a><a href="#associatedtype.Visitor-4" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="delimited/struct.VisitDelimited.html" title="struct tracing_subscriber::field::delimited::VisitDelimited">VisitDelimited</a>&lt;D, &lt;V as <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;&gt;::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CT%3E-for-Alt%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/debug.rs.html#25-35">Source</a><a href="#impl-MakeVisitor%3CT%3E-for-Alt%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, V&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; for <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-5" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/debug.rs.html#29">Source</a><a href="#associatedtype.Visitor-5" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;&lt;V as <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;&gt;::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CT%3E-for-Messages%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/display.rs.html#27-37">Source</a><a href="#impl-MakeVisitor%3CT%3E-for-Messages%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, V&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; for <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-6" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/display.rs.html#31">Source</a><a href="#associatedtype.Visitor-6" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;&lt;V as <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt;&gt;::<a class="associatedtype" href="trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MakeVisitor%3CT%3E-for-F" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#193-202">Source</a><a href="#impl-MakeVisitor%3CT%3E-for-F" class="anchor">§</a><h3 class="code-header">impl&lt;T, V, F&gt; <a class="trait" href="trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;T&gt; for F<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(T) -&gt; V,
V: <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Visitor-7" class="associatedtype trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#198">Source</a><a href="#associatedtype.Visitor-7" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Visitor" class="associatedtype">Visitor</a> = V</h4></section></div></details></div><script src="../../trait.impl/tracing_subscriber/field/trait.MakeVisitor.js" async></script></section></div></main></body></html>

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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 implemented by types which can be recorded by a visitor."><title>RecordFields in tracing_subscriber::field - 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="#">Record<wbr>Fields</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.record" title="record">record</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-RecordFields-for-%26F" title="&#38;F">&#38;F</a></li><li><a href="#impl-RecordFields-for-Attributes%3C'_%3E" title="Attributes&#60;&#39;_&#62;">Attributes&#60;&#39;_&#62;</a></li><li><a href="#impl-RecordFields-for-Event%3C'_%3E" title="Event&#60;&#39;_&#62;">Event&#60;&#39;_&#62;</a></li><li><a href="#impl-RecordFields-for-Record%3C'_%3E" title="Record&#60;&#39;_&#62;">Record&#60;&#39;_&#62;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Trait <span class="trait">RecordFields</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/field/mod.rs.html#88-91">Source</a> </span></div><pre class="rust item-decl"><code>pub trait RecordFields: Sealed&lt;RecordFieldsMarker&gt; {
// Required method
fn <a href="#tymethod.record" class="fn">record</a>(&amp;self, visitor: &amp;mut dyn <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>);
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait implemented by types which can be recorded by a <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a>.</p>
<p>This allows writing code that is generic over <code>tracing_core</code>’s
<a href="../../tracing_core/span/struct.Attributes.html" title="struct tracing_core::span::Attributes"><code>span::Attributes</code></a>, <a href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record"><code>span::Record</code></a>, and <a href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a>
types. These types all provide inherent <code>record</code> methods that allow a
visitor to record their fields, but there is no common trait representing this.</p>
<p>With <code>RecordFields</code>, we can write code like this:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_core::field::Visit;
<span class="kw">use </span>tracing_subscriber::field::RecordFields;
<span class="kw">struct </span>MyVisitor {
<span class="comment">// ...
</span>}
<span class="kw">impl </span>Visit <span class="kw">for </span>MyVisitor {
<span class="comment">// ...
</span>}
<span class="kw">fn </span>record_with_my_visitor&lt;R&gt;(r: R)
<span class="kw">where
</span>R: RecordFields,
{
<span class="kw">let </span><span class="kw-2">mut </span>visitor = MyVisitor::new();
r.record(<span class="kw-2">&amp;mut </span>visitor);
}</code></pre></div>
</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.record" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#90">Source</a><h4 class="code-header">fn <a href="#tymethod.record" class="fn">record</a>(&amp;self, visitor: &amp;mut dyn <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>)</h4></section></summary><div class="docblock"><p>Record all the fields in <code>self</code> with the provided <code>visitor</code>.</p>
</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-RecordFields-for-Event%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#161-165">Source</a><a href="#impl-RecordFields-for-Event%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a> for <a class="struct" href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event">Event</a>&lt;'_&gt;</h3></section></summary><div class="impl-items"><section id="method.record" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#162-164">Source</a><a href="#method.record" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.record" class="fn">record</a>(&amp;self, visitor: &amp;mut dyn <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-RecordFields-for-Attributes%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#168-172">Source</a><a href="#impl-RecordFields-for-Attributes%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a> for <a class="struct" href="../../tracing_core/span/struct.Attributes.html" title="struct tracing_core::span::Attributes">Attributes</a>&lt;'_&gt;</h3></section></summary><div class="impl-items"><section id="method.record-1" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#169-171">Source</a><a href="#method.record-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.record" class="fn">record</a>(&amp;self, visitor: &amp;mut dyn <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-RecordFields-for-Record%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#175-179">Source</a><a href="#impl-RecordFields-for-Record%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a> for <a class="struct" href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record">Record</a>&lt;'_&gt;</h3></section></summary><div class="impl-items"><section id="method.record-2" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#176-178">Source</a><a href="#method.record-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.record" class="fn">record</a>(&amp;self, visitor: &amp;mut dyn <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-RecordFields-for-%26F" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#182-189">Source</a><a href="#impl-RecordFields-for-%26F" class="anchor">§</a><h3 class="code-header">impl&lt;F&gt; <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a> for <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;F</a><div class="where">where
F: <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>,</div></h3></section></summary><div class="impl-items"><section id="method.record-3" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#186-188">Source</a><a href="#method.record-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.record" class="fn">record</a>(&amp;self, visitor: &amp;mut dyn <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>)</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/tracing_subscriber/field/trait.RecordFields.js" data-ignore-extern-crates="tracing_core" async></script></section></div></main></body></html>

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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="Visits typed values."><title>Visit in tracing_subscriber::field - 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="#">Visit</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.record_debug" title="record_debug">record_debug</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.record_bool" title="record_bool">record_bool</a></li><li><a href="#method.record_bytes" title="record_bytes">record_bytes</a></li><li><a href="#method.record_error" title="record_error">record_error</a></li><li><a href="#method.record_f64" title="record_f64">record_f64</a></li><li><a href="#method.record_i128" title="record_i128">record_i128</a></li><li><a href="#method.record_i64" title="record_i64">record_i64</a></li><li><a href="#method.record_str" title="record_str">record_str</a></li><li><a href="#method.record_u128" title="record_u128">record_u128</a></li><li><a href="#method.record_u64" title="record_u64">record_u64</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Visit-for-DebugMap%3C'a,+'b%3E" title="DebugMap&#60;&#39;a, &#39;b&#62;">DebugMap&#60;&#39;a, &#39;b&#62;</a></li><li><a href="#impl-Visit-for-DebugStruct%3C'a,+'b%3E" title="DebugStruct&#60;&#39;a, &#39;b&#62;">DebugStruct&#60;&#39;a, &#39;b&#62;</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Trait <span class="trait">Visit</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_core/field.rs.html#266">Source</a> </span></div><pre class="rust item-decl"><code>pub trait Visit {
// Required method
fn <a href="#tymethod.record_debug" class="fn">record_debug</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>);
// Provided methods
fn <a href="#method.record_f64" class="fn">record_f64</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.f64.html">f64</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_i64" class="fn">record_i64</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.i64.html">i64</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_u64" class="fn">record_u64</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u64.html">u64</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_i128" class="fn">record_i128</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.i128.html">i128</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_u128" class="fn">record_u128</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u128.html">u128</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_bool" class="fn">record_bool</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_str" class="fn">record_str</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_bytes" class="fn">record_bytes</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u8.html">u8</a>]) { ... }
<span class="item-spacer"></span> fn <a href="#method.record_error" class="fn">record_error</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;(dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/error/trait.Error.html" title="trait core::error::Error">Error</a> + 'static)) { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Visits typed values.</p>
<p>An instance of <code>Visit</code> (“a visitor”) represents the logic necessary to
record field values of various types. When an implementor of <a href="../../tracing_core/field/trait.Value.html" title="trait tracing_core::field::Value"><code>Value</code></a> is
<a href="../../tracing_core/field/trait.Value.html#tymethod.record" title="method tracing_core::field::Value::record">recorded</a>, it calls the appropriate method on the provided visitor to
indicate the type that value should be recorded as.</p>
<p>When a <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> implementation <a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.event" title="method tracing_core::subscriber::Subscriber::event">records an <code>Event</code></a> or a
<a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.record" title="method tracing_core::subscriber::Subscriber::record">set of <code>Value</code>s added to a <code>Span</code></a>, it can pass an <code>&amp;mut Visit</code> to the
<code>record</code> method on the provided <a href="../../tracing_core/field/struct.ValueSet.html" title="struct tracing_core::field::ValueSet"><code>ValueSet</code></a> or <a href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a>. This visitor
will then be used to record all the field-value pairs present on that
<code>Event</code> or <code>ValueSet</code>.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<p>A simple visitor that writes to a string might be implemented like so:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::fmt::{<span class="self">self</span>, Write};
<span class="kw">use </span>tracing::field::{Value, Visit, Field};
<span class="kw">pub struct </span>StringVisitor&lt;<span class="lifetime">'a</span>&gt; {
string: <span class="kw-2">&amp;</span><span class="lifetime">'a </span><span class="kw-2">mut </span>String,
}
<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>&gt; Visit <span class="kw">for </span>StringVisitor&lt;<span class="lifetime">'a</span>&gt; {
<span class="kw">fn </span>record_debug(<span class="kw-2">&amp;mut </span><span class="self">self</span>, field: <span class="kw-2">&amp;</span>Field, value: <span class="kw-2">&amp;</span><span class="kw">dyn </span>fmt::Debug) {
<span class="macro">write!</span>(<span class="self">self</span>.string, <span class="string">"{} = {:?}; "</span>, field.name(), value).unwrap();
}
}</code></pre></div>
<p>This visitor will format each recorded value using <code>fmt::Debug</code>, and
append the field name and formatted value to the provided string,
regardless of the type of the recorded value. When all the values have
been recorded, the <code>StringVisitor</code> may be dropped, allowing the string
to be printed or stored in some other data structure.</p>
<p>The <code>Visit</code> trait provides default implementations for <code>record_i64</code>,
<code>record_u64</code>, <code>record_bool</code>, <code>record_str</code>, and <code>record_error</code>, which simply
forward the recorded value to <code>record_debug</code>. Thus, <code>record_debug</code> is the
only method which a <code>Visit</code> implementation <em>must</em> implement. However,
visitors may override the default implementations of these functions in
order to implement type-specific behavior.</p>
<p>Additionally, when a visitor receives a value of a type it does not care
about, it is free to ignore those values completely. For example, a
visitor which only records numeric data might look like this:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">pub struct </span>SumVisitor {
sum: i64,
}
<span class="kw">impl </span>Visit <span class="kw">for </span>SumVisitor {
<span class="kw">fn </span>record_i64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _field: <span class="kw-2">&amp;</span>Field, value: i64) {
<span class="self">self</span>.sum += value;
}
<span class="kw">fn </span>record_u64(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _field: <span class="kw-2">&amp;</span>Field, value: u64) {
<span class="self">self</span>.sum += value <span class="kw">as </span>i64;
}
<span class="kw">fn </span>record_debug(<span class="kw-2">&amp;mut </span><span class="self">self</span>, _field: <span class="kw-2">&amp;</span>Field, _value: <span class="kw-2">&amp;</span>fmt::Debug) {
<span class="comment">// Do nothing
</span>}
}</code></pre></div>
<p>This visitor (which is probably not particularly useful) keeps a running
sum of all the numeric values it records, and ignores all other values. A
more practical example of recording typed values is presented in
<code>examples/counters.rs</code>, which demonstrates a very simple metrics system
implemented using <code>tracing</code>.</p>
<div class="example-wrap" style="display:inline-block">
<pre class="ignore" style="white-space:normal;font:inherit;">
<strong>Note</strong>: The <code>record_error</code> trait method is only
available when the Rust standard library is present, as it requires the
<code>std::error::Error</code> trait.
</pre></div>
</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.record_debug" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#331">Source</a><h4 class="code-header">fn <a href="#tymethod.record_debug" class="fn">record_debug</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>)</h4></section></summary><div class="docblock"><p>Visit a value implementing <code>fmt::Debug</code>.</p>
</div></details></div><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.record_f64" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#277">Source</a><h4 class="code-header">fn <a href="#method.record_f64" class="fn">record_f64</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.f64.html">f64</a>)</h4></section></summary><div class="docblock"><p>Visit a double-precision floating point value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_i64" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#282">Source</a><h4 class="code-header">fn <a href="#method.record_i64" class="fn">record_i64</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.i64.html">i64</a>)</h4></section></summary><div class="docblock"><p>Visit a signed 64-bit integer value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_u64" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#287">Source</a><h4 class="code-header">fn <a href="#method.record_u64" class="fn">record_u64</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u64.html">u64</a>)</h4></section></summary><div class="docblock"><p>Visit an unsigned 64-bit integer value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_i128" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#292">Source</a><h4 class="code-header">fn <a href="#method.record_i128" class="fn">record_i128</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.i128.html">i128</a>)</h4></section></summary><div class="docblock"><p>Visit a signed 128-bit integer value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_u128" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#297">Source</a><h4 class="code-header">fn <a href="#method.record_u128" class="fn">record_u128</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u128.html">u128</a>)</h4></section></summary><div class="docblock"><p>Visit an unsigned 128-bit integer value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_bool" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#302">Source</a><h4 class="code-header">fn <a href="#method.record_bool" class="fn">record_bool</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.bool.html">bool</a>)</h4></section></summary><div class="docblock"><p>Visit a boolean value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_str" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#307">Source</a><h4 class="code-header">fn <a href="#method.record_str" class="fn">record_str</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>)</h4></section></summary><div class="docblock"><p>Visit a string value.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_bytes" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#312">Source</a><h4 class="code-header">fn <a href="#method.record_bytes" class="fn">record_bytes</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;[<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.u8.html">u8</a>])</h4></section></summary><div class="docblock"><p>Visit a byte slice.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_error" class="method"><a class="src rightside" href="../../src/tracing_core/field.rs.html#326">Source</a><h4 class="code-header">fn <a href="#method.record_error" class="fn">record_error</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;(dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/error/trait.Error.html" title="trait core::error::Error">Error</a> + 'static))</h4></section></summary><div class="docblock"><p>Records a type implementing <code>Error</code>.</p>
<div class="example-wrap" style="display:inline-block">
<pre class="ignore" style="white-space:normal;font:inherit;">
<strong>Note</strong>: This is only enabled when the Rust standard library is
present.
</pre>
</div></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-Visit-for-DebugMap%3C'a,+'b%3E" class="impl"><a class="src rightside" href="../../src/tracing_core/field.rs.html#416">Source</a><a href="#impl-Visit-for-DebugMap%3C'a,+'b%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/fmt/builders/struct.DebugMap.html" title="struct core::fmt::builders::DebugMap">DebugMap</a>&lt;'a, 'b&gt;</h3></section></summary><div class="impl-items"><section id="method.record_debug" class="method trait-impl"><a class="src rightside" href="../../src/tracing_core/field.rs.html#417">Source</a><a href="#method.record_debug" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.record_debug" class="fn">record_debug</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Visit-for-DebugStruct%3C'a,+'b%3E" class="impl"><a class="src rightside" href="../../src/tracing_core/field.rs.html#410">Source</a><a href="#impl-Visit-for-DebugStruct%3C'a,+'b%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, 'b&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/fmt/builders/struct.DebugStruct.html" title="struct core::fmt::builders::DebugStruct">DebugStruct</a>&lt;'a, 'b&gt;</h3></section></summary><div class="impl-items"><section id="method.record_debug-1" class="method trait-impl"><a class="src rightside" href="../../src/tracing_core/field.rs.html#411">Source</a><a href="#method.record_debug-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.record_debug" class="fn">record_debug</a>(&amp;mut self, field: &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, value: &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>)</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-Visit-for-DefaultVisitor%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1240-1299">Source</a><a href="#impl-Visit-for-DefaultVisitor%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="../fmt/format/struct.DefaultVisitor.html" title="struct tracing_subscriber::fmt::format::DefaultVisitor">DefaultVisitor</a>&lt;'_&gt;</h3></section><section id="impl-Visit-for-PrettyVisitor%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/pretty.rs.html#440-498">Source</a><a href="#impl-Visit-for-PrettyVisitor%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="../fmt/format/struct.PrettyVisitor.html" title="struct tracing_subscriber::fmt::format::PrettyVisitor">PrettyVisitor</a>&lt;'_&gt;</h3></section><section id="impl-Visit-for-FieldFnVisitor%3C'a,+F%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1540-1549">Source</a><a href="#impl-Visit-for-FieldFnVisitor%3C'a,+F%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, F&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="../fmt/format/struct.FieldFnVisitor.html" title="struct tracing_subscriber::fmt::format::FieldFnVisitor">FieldFnVisitor</a>&lt;'a, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&amp;mut <a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;, &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/1.84.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>,</div></h3></section><section id="impl-Visit-for-VisitDelimited%3CD,+V%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/delimited.rs.html#83-112">Source</a><a href="#impl-Visit-for-VisitDelimited%3CD,+V%3E" class="anchor">§</a><h3 class="code-header">impl&lt;D, V&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="delimited/struct.VisitDelimited.html" title="struct tracing_subscriber::field::delimited::VisitDelimited">VisitDelimited</a>&lt;D, V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,
D: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>&gt;,</div></h3></section><section id="impl-Visit-for-F" class="impl"><a class="src rightside" href="../../src/tracing_core/field.rs.html#422-424">Source</a><a href="#impl-Visit-for-F" class="anchor">§</a><h3 class="code-header">impl&lt;F&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for F<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>),</div></h3></section><section id="impl-Visit-for-Alt%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/debug.rs.html#37-75">Source</a><a href="#impl-Visit-for-Alt%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>,</div></h3></section><section id="impl-Visit-for-Messages%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/display.rs.html#39-81">Source</a><a href="#impl-Visit-for-Messages%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V&gt; <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> for <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a>,</div></h3></section></div><script src="../../trait.impl/tracing_core/field/trait.Visit.js" data-ignore-extern-crates="core" async></script></section></div></main></body></html>

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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 implemented by visitors to indicate that they write to a `fmt::Write` instance, and allow access to that writer."><title>VisitFmt in tracing_subscriber::field - 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="#">Visit<wbr>Fmt</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.writer" title="writer">writer</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Trait <span class="trait">VisitFmt</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/field/mod.rs.html#124-127">Source</a> </span></div><pre class="rust item-decl"><code>pub trait VisitFmt: <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;<a class="type" href="https://doc.rust-lang.org/1.84.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>&gt; {
// Required method
fn <a href="#tymethod.writer" class="fn">writer</a>(&amp;mut self) -&gt; &amp;mut dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Write.html" title="trait core::fmt::Write">Write</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait implemented by visitors to indicate that they write to a
<code>fmt::Write</code> instance, and allow access to that writer.</p>
</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.writer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#126">Source</a><h4 class="code-header">fn <a href="#tymethod.writer" class="fn">writer</a>(&amp;mut self) -&gt; &amp;mut dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Write.html" title="trait core::fmt::Write">Write</a></h4></section></summary><div class="docblock"><p>Returns the formatter that this visitor writes to.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-VisitFmt-for-DefaultVisitor%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1307-1311">Source</a><a href="#impl-VisitFmt-for-DefaultVisitor%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> for <a class="struct" href="../fmt/format/struct.DefaultVisitor.html" title="struct tracing_subscriber::fmt::format::DefaultVisitor">DefaultVisitor</a>&lt;'_&gt;</h3></section><section id="impl-VisitFmt-for-PrettyVisitor%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/pretty.rs.html#507-511">Source</a><a href="#impl-VisitFmt-for-PrettyVisitor%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> for <a class="struct" href="../fmt/format/struct.PrettyVisitor.html" title="struct tracing_subscriber::fmt::format::PrettyVisitor">PrettyVisitor</a>&lt;'_&gt;</h3></section><section id="impl-VisitFmt-for-FieldFnVisitor%3C'a,+F%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1560-1567">Source</a><a href="#impl-VisitFmt-for-FieldFnVisitor%3C'a,+F%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, F&gt; <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> for <a class="struct" href="../fmt/format/struct.FieldFnVisitor.html" title="struct tracing_subscriber::fmt::format::FieldFnVisitor">FieldFnVisitor</a>&lt;'a, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&amp;mut <a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;, &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/1.84.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>,</div></h3></section><section id="impl-VisitFmt-for-VisitDelimited%3CD,+V%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/delimited.rs.html#125-133">Source</a><a href="#impl-VisitFmt-for-VisitDelimited%3CD,+V%3E" class="anchor">§</a><h3 class="code-header">impl&lt;D, V&gt; <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> for <a class="struct" href="delimited/struct.VisitDelimited.html" title="struct tracing_subscriber::field::delimited::VisitDelimited">VisitDelimited</a>&lt;D, V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,
D: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>&gt;,</div></h3></section><section id="impl-VisitFmt-for-Alt%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/debug.rs.html#103-111">Source</a><a href="#impl-VisitFmt-for-Alt%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V&gt; <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> for <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,</div></h3></section><section id="impl-VisitFmt-for-Messages%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/display.rs.html#109-117">Source</a><a href="#impl-VisitFmt-for-Messages%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V&gt; <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> for <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/field/trait.VisitFmt.js" async></script></section></div></main></body></html>

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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 visitor that produces output once it has visited a set of fields."><title>VisitOutput in tracing_subscriber::field - 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="#">Visit<wbr>Output</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.finish" title="finish">finish</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.visit" title="visit">visit</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Trait <span class="trait">VisitOutput</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/field/mod.rs.html#37-53">Source</a> </span></div><pre class="rust item-decl"><code>pub trait VisitOutput&lt;Out&gt;: <a class="trait" href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">Visit</a> {
// Required method
fn <a href="#tymethod.finish" class="fn">finish</a>(self) -&gt; Out;
// Provided method
fn <a href="#method.visit" class="fn">visit</a>&lt;R&gt;(self, fields: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;R</a>) -&gt; Out
<span class="where">where R: <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>,
Self: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a></span> { ... }
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A <a href="trait.Visit.html" title="trait tracing_subscriber::field::Visit">visitor</a> that produces output once it has visited a set of fields.</p>
</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.finish" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#41">Source</a><h4 class="code-header">fn <a href="#tymethod.finish" class="fn">finish</a>(self) -&gt; Out</h4></section></summary><div class="docblock"><p>Completes the visitor, returning any output.</p>
<p>This is called once a full set of fields has been visited.</p>
</div></details></div><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.visit" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#45-52">Source</a><h4 class="code-header">fn <a href="#method.visit" class="fn">visit</a>&lt;R&gt;(self, fields: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;R</a>) -&gt; Out<div class="where">where
R: <a class="trait" href="trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>,
Self: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Visit a set of fields, and return the output of finishing the visitor
once the fields have been visited.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-DefaultVisitor%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1301-1305">Source</a><a href="#impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-DefaultVisitor%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>&gt;&gt; for <a class="struct" href="../fmt/format/struct.DefaultVisitor.html" title="struct tracing_subscriber::fmt::format::DefaultVisitor">DefaultVisitor</a>&lt;'_&gt;</h3></section><section id="impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-PrettyVisitor%3C'_%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/pretty.rs.html#500-505">Source</a><a href="#impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-PrettyVisitor%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>&gt;&gt; for <a class="struct" href="../fmt/format/struct.PrettyVisitor.html" title="struct tracing_subscriber::fmt::format::PrettyVisitor">PrettyVisitor</a>&lt;'_&gt;</h3></section><section id="impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-FieldFnVisitor%3C'a,+F%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1551-1558">Source</a><a href="#impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-FieldFnVisitor%3C'a,+F%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, F&gt; <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>&gt;&gt; for <a class="struct" href="../fmt/format/struct.FieldFnVisitor.html" title="struct tracing_subscriber::fmt::format::FieldFnVisitor">FieldFnVisitor</a>&lt;'a, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(&amp;mut <a class="struct" href="../fmt/format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;, &amp;<a class="struct" href="../../tracing_core/field/struct.Field.html" title="struct tracing_core::field::Field">Field</a>, &amp;dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/1.84.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>,</div></h3></section><section id="impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-VisitDelimited%3CD,+V%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/delimited.rs.html#114-123">Source</a><a href="#impl-VisitOutput%3CResult%3C(),+Error%3E%3E-for-VisitDelimited%3CD,+V%3E" class="anchor">§</a><h3 class="code-header">impl&lt;D, V&gt; <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.84.1/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>&gt;&gt; for <a class="struct" href="delimited/struct.VisitDelimited.html" title="struct tracing_subscriber::field::delimited::VisitDelimited">VisitDelimited</a>&lt;D, V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a>,
D: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.str.html">str</a>&gt;,</div></h3></section><section id="impl-VisitOutput%3CO%3E-for-Alt%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/debug.rs.html#77-85">Source</a><a href="#impl-VisitOutput%3CO%3E-for-Alt%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V, O&gt; <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;O&gt; for <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;O&gt;,</div></h3></section><section id="impl-VisitOutput%3CO%3E-for-Messages%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/display.rs.html#83-91">Source</a><a href="#impl-VisitOutput%3CO%3E-for-Messages%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V, O&gt; <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;O&gt; for <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;O&gt;,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/field/trait.VisitOutput.js" async></script></section></div></main></body></html>

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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 implemented by visitors to indicate that they write to an `io::Write` instance, and allow access to that writer."><title>VisitWrite in tracing_subscriber::field - 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="#">Visit<wbr>Write</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.writer" title="writer">writer</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In tracing_<wbr>subscriber::<wbr>field</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">field</a></span><h1>Trait <span class="trait">VisitWrite</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/field/mod.rs.html#116-119">Source</a> </span></div><pre class="rust item-decl"><code>pub trait VisitWrite: <a class="trait" href="trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.84.1/std/io/error/struct.Error.html" title="struct std::io::error::Error">Error</a>&gt;&gt; {
// Required method
fn <a href="#tymethod.writer" class="fn">writer</a>(&amp;mut self) -&gt; &amp;mut dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/std/io/trait.Write.html" title="trait std::io::Write">Write</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Extension trait implemented by visitors to indicate that they write to an
<code>io::Write</code> instance, and allow access to that writer.</p>
</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.writer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/field/mod.rs.html#118">Source</a><h4 class="code-header">fn <a href="#tymethod.writer" class="fn">writer</a>(&amp;mut self) -&gt; &amp;mut dyn <a class="trait" href="https://doc.rust-lang.org/1.84.1/std/io/trait.Write.html" title="trait std::io::Write">Write</a></h4></section></summary><div class="docblock"><p>Returns the writer that this visitor writes to.</p>
</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-VisitWrite-for-Alt%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/debug.rs.html#92-100">Source</a><a href="#impl-VisitWrite-for-Alt%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V&gt; <a class="trait" href="trait.VisitWrite.html" title="trait tracing_subscriber::field::VisitWrite">VisitWrite</a> for <a class="struct" href="debug/struct.Alt.html" title="struct tracing_subscriber::field::debug::Alt">Alt</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitWrite.html" title="trait tracing_subscriber::field::VisitWrite">VisitWrite</a>,</div></h3></section><section id="impl-VisitWrite-for-Messages%3CV%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/field/display.rs.html#98-106">Source</a><a href="#impl-VisitWrite-for-Messages%3CV%3E" class="anchor">§</a><h3 class="code-header">impl&lt;V&gt; <a class="trait" href="trait.VisitWrite.html" title="trait tracing_subscriber::field::VisitWrite">VisitWrite</a> for <a class="struct" href="display/struct.Messages.html" title="struct tracing_subscriber::field::display::Messages">Messages</a>&lt;V&gt;<div class="where">where
V: <a class="trait" href="trait.VisitWrite.html" title="trait tracing_subscriber::field::VisitWrite">VisitWrite</a>,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/field/trait.VisitWrite.js" async></script></section></div></main></body></html>