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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><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc 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">&#9776;</button><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../tracing_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">MakeVisitor</a></h2><div class="sidebar-elems"><section><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Visitor">Visitor</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.make_visitor">make_visitor</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In tracing_subscriber::field</a></h2></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing_subscriber/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press S to search, ? for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="../index.html">tracing_subscriber</a>::<wbr><a href="index.html">field</a>::<wbr><a class="trait" href="#">MakeVisitor</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_subscriber/field/mod.rs.html#26-32">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></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 visitors 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 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 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/1.76.0/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/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>) -&gt; <a class="type" href="https://doc.rust-lang.org/1.76.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/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 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/1.76.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.76.0/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 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 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 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/1.76.0/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 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>