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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 writer to which formatted representations of spans and events are written."><title>Writer in tracing_subscriber::fmt::format - 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 struct"><!--[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="#">Writer</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.by_ref">by_ref</a></li><li><a href="#method.has_ansi_escapes">has_ansi_escapes</a></li><li><a href="#method.new">new</a></li><li><a href="#method.write_char">write_char</a></li><li><a href="#method.write_fmt">write_fmt</a></li><li><a href="#method.write_str">write_str</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-Writer%3C'_%3E">Debug</a></li><li><a href="#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-DefaultFields">MakeVisitor&lt;Writer&lt;&#x27;a&gt;&gt;</a></li><li><a href="#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-FieldFn%3CF%3E">MakeVisitor&lt;Writer&lt;&#x27;a&gt;&gt;</a></li><li><a href="#impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-PrettyFields">MakeVisitor&lt;Writer&lt;&#x27;a&gt;&gt;</a></li><li><a href="#impl-Write-for-Writer%3C'_%3E">Write</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Ref
<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>Struct <a href="../../index.html">tracing_subscriber</a>::<wbr><a href="../index.html">fmt</a>::<wbr><a href="index.html">format</a>::<wbr><a class="struct" href="#">Writer</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#306-310">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct Writer&lt;'writer&gt; { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A writer to which formatted representations of spans and events are written.</p>
<p>This type is provided as input to the <a href="../trait.FormatEvent.html#tymethod.format_event" title="method tracing_subscriber::fmt::FormatEvent::format_event"><code>FormatEvent::format_event</code></a> and
<a href="../trait.FormatFields.html#tymethod.format_fields" title="method tracing_subscriber::fmt::FormatFields::format_fields"><code>FormatFields::format_fields</code></a> methods, which will write formatted
representations of <a href="../../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a>s and <a href="../../../tracing_core/field/index.html" title="mod tracing_core::field">fields</a> to the <code>Writer</code>.</p>
<p>This type implements the <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> trait, allowing it to be used
with any function that takes an instance of <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a>.
Additionally, it can be used with the standard librarys <a href="https://doc.rust-lang.org/1.76.0/core/macro.write.html" title="macro core::write"><code>std::write!</code></a> and
<a href="https://doc.rust-lang.org/1.76.0/core/macro.writeln.html" title="macro core::writeln"><code>std::writeln!</code></a> macros.</p>
<p>Additionally, a <code>Writer</code> may expose additional <code>tracing</code>-specific
information to the formatter implementation.</p>
</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Writer%3C'writer%3E" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#416-559">source</a><a href="#impl-Writer%3C'writer%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'writer&gt; <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'writer&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#433-438">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>(writer: &amp;'writer mut impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write">Write</a>) -&gt; Self</h4></section></summary><div class="docblock"><p>Create a new <a href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a> from any type that implements <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>fmt::Write</code></a>.</p>
<p>The returned <code>Writer</code> value may be passed as an argument to methods
such as <a href="struct.Format.html#method.format_event" title="method tracing_subscriber::fmt::format::Format::format_event"><code>Format::format_event</code></a>. Since constructing a <code>Writer</code>
mutably borrows the underlying <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>fmt::Write</code></a> instance, that value may
be accessed again once the <code>Writer</code> is dropped. For example, if the
value implementing <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>fmt::Write</code></a> is a <a href="https://doc.rust-lang.org/1.76.0/alloc/string/struct.String.html" title="struct alloc::string::String"><code>String</code></a>, it will contain
the formatted output of <a href="struct.Format.html#method.format_event" title="method tracing_subscriber::fmt::format::Format::format_event"><code>Format::format_event</code></a>, which may then be
used for other purposes.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.by_ref" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#450-456">source</a><h4 class="code-header">pub fn <a href="#method.by_ref" class="fn">by_ref</a>(&amp;mut self) -&gt; <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Return a new <code>Writer</code> that mutably borrows <code>self</code>.</p>
<p>This can be used to temporarily borrow a <code>Writer</code> to pass a new <code>Writer</code>
to a function that takes a <code>Writer</code> by value, allowing the original writer
to still be used once that function returns.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.write_str" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#475-477">source</a><h4 class="code-header">pub fn <a href="#method.write_str" class="fn">write_str</a>(&amp;mut self, s: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</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></h4></section></summary><div class="docblock"><p>Writes a string slice into this <code>Writer</code>, returning whether the write succeeded.</p>
<p>This method can only succeed if the entire string slice was successfully
written, and this method will not return until all data has been written
or an error occurs.</p>
<p>This is identical to calling the <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#tymethod.write_str" title="method core::fmt::Write::write_str"><code>write_str</code> method</a> from the <code>Writer</code>s
<a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> implementation. However, it is also provided as an
inherent method, so that <code>Writer</code>s can be used without needing to import the
<a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> trait.</p>
<h5 id="errors"><a href="#errors">Errors</a></h5>
<p>This function will return an instance of <a href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Error.html" title="struct core::fmt::Error"><code>std::fmt::Error</code></a> on error.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.write_char" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#497-499">source</a><h4 class="code-header">pub fn <a href="#method.write_char" class="fn">write_char</a>(&amp;mut self, c: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html">char</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></h4></section></summary><div class="docblock"><p>Writes a <a href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html" title="primitive char"><code>char</code></a> into this writer, returning whether the write succeeded.</p>
<p>A single <a href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html" title="primitive char"><code>char</code></a> may be encoded as more than one byte.
This method can only succeed if the entire byte sequence was successfully
written, and this method will not return until all data has been
written or an error occurs.</p>
<p>This is identical to calling the <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#method.write_char" title="method core::fmt::Write::write_char"><code>write_char</code> method</a> from the <code>Writer</code>s
<a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> implementation. However, it is also provided as an
inherent method, so that <code>Writer</code>s can be used without needing to import the
<a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> trait.</p>
<h5 id="errors-1"><a href="#errors-1">Errors</a></h5>
<p>This function will return an instance of <a href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Error.html" title="struct core::fmt::Error"><code>std::fmt::Error</code></a> on error.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.write_fmt" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#513-515">source</a><h4 class="code-header">pub fn <a href="#method.write_fmt" class="fn">write_fmt</a>(&amp;mut self, args: <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Arguments.html" title="struct core::fmt::Arguments">Arguments</a>&lt;'_&gt;) -&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></h4></section></summary><div class="docblock"><p>Glue for usage of the <a href="https://doc.rust-lang.org/1.76.0/core/macro.write.html" title="macro core::write"><code>write!</code></a> macro with <code>Writer</code>s.</p>
<p>This method should generally not be invoked manually, but rather through
the <a href="https://doc.rust-lang.org/1.76.0/core/macro.write.html" title="macro core::write"><code>write!</code></a> macro itself.</p>
<p>This is identical to calling the <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#method.write_fmt" title="method core::fmt::Write::write_fmt"><code>write_fmt</code> method</a> from the <code>Writer</code>s
<a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> implementation. However, it is also provided as an
inherent method, so that <code>Writer</code>s can be used with the [<code>write!</code> macro]
without needing to import the
<a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html" title="trait core::fmt::Write"><code>std::fmt::Write</code></a> trait.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.has_ansi_escapes" class="method"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#523-525">source</a><h4 class="code-header">pub fn <a href="#method.has_ansi_escapes" class="fn">has_ansi_escapes</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if <a href="https://en.wikipedia.org/wiki/ANSI_escape_code">ANSI escape codes</a> may be used to add colors
and other formatting when writing to this <code>Writer</code>.</p>
<p>If this returns <code>false</code>, formatters should not emit ANSI escape codes.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-Writer%3C'_%3E" class="impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#578-585">source</a><a href="#impl-Debug-for-Writer%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'_&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#579-584">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&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></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><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="../../field/trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;<a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;&gt; for <a class="struct" href="struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Visitor-2" class="associatedtype trait-impl"><a href="#associatedtype.Visitor-2" class="anchor">§</a><h4 class="code-header">type <a href="../../field/trait.MakeVisitor.html#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="struct.DefaultVisitor.html" title="struct tracing_subscriber::fmt::format::DefaultVisitor">DefaultVisitor</a>&lt;'a&gt;</h4></section></summary><div class='docblock'>The visitor type produced by this <code>MakeVisitor</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.make_visitor-2" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#1209-1211">source</a><a href="#method.make_visitor-2" class="anchor">§</a><h4 class="code-header">fn <a href="../../field/trait.MakeVisitor.html#tymethod.make_visitor" class="fn">make_visitor</a>(&amp;self, target: <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;) -&gt; Self::<a class="associatedtype" href="../../field/trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a></h4></section></summary><div class='docblock'>Make a new visitor for the provided <code>target</code>.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-MakeVisitor%3CWriter%3C'a%3E%3E-for-FieldFn%3CF%3E" class="impl"><a class="src
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="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"><details class="toggle" open><summary><section id="associatedtype.Visitor-1" class="associatedtype trait-impl"><a href="#associatedtype.Visitor-1" class="anchor">§</a><h4 class="code-header">type <a href="../../field/trait.MakeVisitor.html#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="struct.FieldFnVisitor.html" title="struct tracing_subscriber::fmt::format::FieldFnVisitor">FieldFnVisitor</a>&lt;'a, F&gt;</h4></section></summary><div class='docblock'>The visitor type produced by this <code>MakeVisitor</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.make_visitor-1" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#1531-1537">source</a><a href="#method.make_visitor-1" class="anchor">§</a><h4 class="code-header">fn <a href="../../field/trait.MakeVisitor.html#tymethod.make_visitor" class="fn">make_visitor</a>(&amp;self, writer: <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;) -&gt; Self::<a class="associatedtype" href="../../field/trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a></h4></section></summary><div class='docblock'>Make a new visitor for the provided <code>target</code>.</div></details></div></details><details class="toggle implementors-toggle" open><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="../../field/trait.MakeVisitor.html" title="trait tracing_subscriber::field::MakeVisitor">MakeVisitor</a>&lt;<a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'a&gt;&gt; for <a class="struct" href="struct.PrettyFields.html" title="struct tracing_subscriber::fmt::format::PrettyFields">PrettyFields</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Visitor" class="associatedtype trait-impl"><a href="#associatedtype.Visitor" class="anchor">§</a><h4 class="code-header">type <a href="../../field/trait.MakeVisitor.html#associatedtype.Visitor" class="associatedtype">Visitor</a> = <a class="struct" href="struct.PrettyVisitor.html" title="struct tracing_subscriber::fmt::format::PrettyVisitor">PrettyVisitor</a>&lt;'a&gt;</h4></section></summary><div class='docblock'>The visitor type produced by this <code>MakeVisitor</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.make_visitor" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/pretty.rs.html#391-396">source</a><a href="#method.make_visitor" class="anchor">§</a><h4 class="code-header">fn <a href="../../field/trait.MakeVisitor.html#tymethod.make_visitor" class="fn">make_visitor</a>(&amp;self, target: <a class="struct" href="struct.Writer.html" title
succeeded. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#tymethod.write_str">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.write_char-1" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#568-570">source</a><a href="#method.write_char-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#method.write_char" class="fn">write_char</a>(&amp;mut self, c: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html">char</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></h4></section></summary><div class='docblock'>Writes a <a href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html" title="primitive char"><code>char</code></a> into this writer, returning whether the write succeeded. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#method.write_char">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.write_fmt-1" class="method trait-impl"><a class="src rightside" href="../../../src/tracing_subscriber/fmt/format/mod.rs.html#573-575">source</a><a href="#method.write_fmt-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#method.write_fmt" class="fn">write_fmt</a>(&amp;mut self, args: <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Arguments.html" title="struct core::fmt::Arguments">Arguments</a>&lt;'_&gt;) -&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></h4></section></summary><div class='docblock'>Glue for usage of the <a href="https://doc.rust-lang.org/1.76.0/core/macro.write.html" title="macro core::write"><code>write!</code></a> macro with implementors of this trait. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Write.html#method.write_fmt">Read more</a></div></details></div></details></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-Writer%3C'writer%3E" class="impl"><a href="#impl-RefUnwindSafe-for-Writer%3C'writer%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'writer&gt; !<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'writer&gt;</h3></section><section id="impl-Send-for-Writer%3C'writer%3E" class="impl"><a href="#impl-Send-for-Writer%3C'writer%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'writer&gt; !<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'writer&gt;</h3></section><section id="impl-Sync-for-Writer%3C'writer%3E" class="impl"><a href="#impl-Sync-for-Writer%3C'writer%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'writer&gt; !<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a>&lt;'writer&gt;</h3></section><section id="impl-Unpin-for-Writer%3C'writer%3E" class="impl"><a href="#impl-Unpin-for-Writer%3C'writer%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'writer&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" hre
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#763">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#766">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Instrument-for-T" class="impl"><a class="src rightside" href="../../../src/tracing/instrument.rs.html#325">source</a><a href="#impl-Instrument-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../../../tracing/instrument/trait.Instrument.html" title="trait tracing::instrument::Instrument">Instrument</a> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.instrument" class="method trait-impl"><a class="src rightside" href="../../../src/tracing/instrument.rs.html#86">source</a><a href="#method.instrument" class="anchor">§</a><h4 class="code-header">fn <a href="../../../tracing/instrument/trait.Instrument.html#method.instrument" class="fn">instrument</a>(self, span: <a class="struct" href="../../../tracing/span/struct.Span.html" title="struct tracing::span::Span">Span</a>) -&gt; <a class="struct" href="../../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the provided <a href="../../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a href="../../../tracing/instrument/trait.Instrument.html#method.instrument">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.in_current_span" class="method trait-impl"><a class="src rightside" href="../../../src/tracing/instrument.rs.html#128">source</a><a href="#method.in_current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../../tracing/instrument/trait.Instrument.html#method.in_current_span" class="fn">in_current_span</a>(self) -&gt; <a class="struct" href="../../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the <a href="../../../tracing/span/struct.Span.html#method.current" title="associated function tracing::span::Span::current">current</a> <a href="../../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a href="../../../tracing/instrument/trait.Instrument.html#method.in_current_span">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#747-749">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#756">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#803-805">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#810">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#788-790">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#795">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-WithSubscriber-for-T" class="impl"><a class="src rightside" href="../../../src/tracing/instrument.rs.html#393">source</a><a href="#impl-WithSubscriber-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="../../../tracing/instrument/trait.WithSubscriber.html" title="trait tracing::instrument::WithSubscriber">WithSubscriber</a> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method trait-impl"><a class="src rightside" href="../../../src/tracing/instrument.rs.html#176-178">source</a><a href="#method.with_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber" class="fn">with_subscriber</a>&lt;S&gt;(self, subscriber: S) -&gt; <a class="struct" href="../../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a>&lt;Self&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="../../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>&gt;,</div></h4></section></summary><div class='docblock'>Attaches the provided <a href="../../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<a href="../../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_current_subscriber" class="method trait-impl"><a class="src rightside" href="../../../src/tracing/instrument.rs.html#228">source</a><a href="#method.with_current_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -&gt; <a class="struct" href="../../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a>&lt;Self&gt;</h4></section></summary><div class='docblock'>Attaches the current <a href="../../../tracing/dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> <a href="../../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
<a href="../../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber">Read more</a></div></details></div></details></div></section></div></main></body></html>