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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 type that can format a set of fields to a `Writer`."><title>FormatFields in tracing_subscriber::fmt - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.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-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.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="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><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" 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_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">FormatFields</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.format_fields">format_fields</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.add_fields">add_fields</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In tracing_subscriber::fmt</a></h2></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"><h1>Trait <a href="../index.html">tracing_subscriber</a>::<wbr><a href="index.html">fmt</a>::<wbr><a class="trait" href="#">FormatFields</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#232-251">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait FormatFields<'writer> {
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// Required method
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fn <a href="#tymethod.format_fields" class="fn">format_fields</a><R: <a class="trait" href="../field/trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>>(
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&self,
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writer: <a class="struct" href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a><'writer>,
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fields: R,
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) -> <a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>;
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// Provided method
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fn <a href="#method.add_fields" class="fn">add_fields</a>(
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&self,
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current: &'writer mut <a class="struct" href="struct.FormattedFields.html" title="struct tracing_subscriber::fmt::FormattedFields">FormattedFields</a><Self>,
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fields: &<a class="struct" href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record">Record</a><'_>,
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) -> <a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a> { ... }
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A type that can format a <a href="../field/trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">set of fields</a> to a <a href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a>.</p>
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<p><code>FormatFields</code> is primarily used in the context of <a href="struct.Subscriber.html" title="struct tracing_subscriber::fmt::Subscriber"><code>FmtSubscriber</code></a>. Each
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time a span or event with fields is recorded, the subscriber will format
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those fields with its associated <code>FormatFields</code> implementation.</p>
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</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.format_fields" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#234">source</a><h4 class="code-header">fn <a href="#tymethod.format_fields" class="fn">format_fields</a><R: <a class="trait" href="../field/trait.RecordFields.html" title="trait tracing_subscriber::field::RecordFields">RecordFields</a>>(
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&self,
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writer: <a class="struct" href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a><'writer>,
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fields: R,
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) -> <a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class="docblock"><p>Format the provided <code>fields</code> to the provided <a href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a>, returning a result.</p>
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</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.add_fields" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#241-250">source</a><h4 class="code-header">fn <a href="#method.add_fields" class="fn">add_fields</a>(
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&self,
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current: &'writer mut <a class="struct" href="struct.FormattedFields.html" title="struct tracing_subscriber::fmt::FormattedFields">FormattedFields</a><Self>,
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fields: &<a class="struct" href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record">Record</a><'_>,
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) -> <a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class="docblock"><p>Record additional field(s) on an existing span.</p>
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<p>By default, this appends a space to the current set of fields if it is
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non-empty, and then calls <code>self.format_fields</code>. If different behavior is
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required, the default implementation of this method can be overridden.</p>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.80.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-FormatFields%3C'writer%3E-for-FmtContext%3C'cx,+S,+N%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#1023-1035">source</a><a href="#impl-FormatFields%3C'writer%3E-for-FmtContext%3C'cx,+S,+N%3E" class="anchor">§</a><h3 class="code-header">impl<'cx, 'writer, S, N> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> for <a class="struct" href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext">FmtContext</a><'cx, S, N><div class="where">where
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S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> + for<'lookup> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'lookup>,
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N: <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h3></section><section id="impl-FormatFields%3C'writer%3E-for-Pretty" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/pretty.rs.html#337-355">source</a><a href="#impl-FormatFields%3C'writer%3E-for-Pretty" class="anchor">§</a><h3 class="code-header">impl<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> for <a class="struct" href="format/struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty">Pretty</a></h3></section><section id="impl-FormatFields%3C'writer%3E-for-M" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/format/mod.rs.html#1159-1169">source</a><a href="#impl-FormatFields%3C'writer%3E-for-M" class="anchor">§</a><h3 class="code-header">impl<'writer, M> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> for M<div class="where">where
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M: <a class="trait" href="../field/trait.MakeOutput.html" title="trait tracing_subscriber::field::MakeOutput">MakeOutput</a><<a class="struct" href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer">Writer</a><'writer>, <a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>>,
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M::<a class="associatedtype" href="../field/trait.MakeVisitor.html#associatedtype.Visitor" title="type tracing_subscriber::field::MakeVisitor::Visitor">Visitor</a>: <a class="trait" href="../field/trait.VisitFmt.html" title="trait tracing_subscriber::field::VisitFmt">VisitFmt</a> + <a class="trait" href="../field/trait.VisitOutput.html" title="trait tracing_subscriber::field::VisitOutput">VisitOutput</a><<a class="type" href="https://doc.rust-lang.org/1.80.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>>,</div></h3></section></div><script src="../../trait.impl/tracing_subscriber/fmt/format/trait.FormatFields.js" async></script></section></div></main></body></html> |