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18 lines
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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="Trait implemented to allow a type to be used as a field key."><meta name="keywords" content="rust, rustlang, rust-lang, AsField"><title>AsField in tracing::field - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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<noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.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="sidebar"><div class="sidebar-menu" role="button">☰</div><a class="sidebar-logo" href="../../tracing/index.html"><div class="logo-container"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></div>
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</a><h2 class="location">Trait AsField</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><div class="sidebar-links"><a href="#tymethod.as_field">as_field</a></div><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><div class="sidebar-links"><a href="#impl-AsField-for-str">str</a></div><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div><h2 class="location">Other items in<br><a href="../index.html">tracing</a>::<wbr><a href="index.html">field</a></h2><div id="sidebar-vars" data-name="AsField" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../tracing/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Trait <a href="../index.html">tracing</a>::<wbr><a href="index.html">field</a>::<wbr><a class="trait" href="#">AsField</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../../src/tracing/field.rs.html#129-135" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust trait"><code>pub trait AsField: Sealed {
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fn <a href="#tymethod.as_field" class="fnname">as_field</a>(&self, metadata: &<a class="struct" href="../struct.Metadata.html" title="struct tracing::Metadata">Metadata</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Field.html" title="struct tracing::field::Field">Field</a>>;
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}</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Trait implemented to allow a type to be used as a field key.</p>
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<pre class="ignore" style="white-space:normal;font:inherit;">
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<strong>Note</strong>: Although this is implemented for both the
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<a href="./struct.Field.html"><code>Field</code></a> type <em>and</em> any
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type that can be borrowed as an <code>&str</code>, only <code>Field</code>
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allows <em>O</em>(1) access.
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Indexing a field with a string results in an iterative search that performs
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string comparisons. Thus, if possible, once the key for a field is known, it
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should be used whenever possible.
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</pre></div></details><h2 id="required-methods" class="small-section-header">Required methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="tymethod.as_field" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tracing/field.rs.html#134" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#tymethod.as_field" class="fnname">as_field</a>(&self, metadata: &<a class="struct" href="../struct.Metadata.html" title="struct tracing::Metadata">Metadata</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Field.html" title="struct tracing::field::Field">Field</a>></h4></div></summary><div class="docblock"><p>Attempts to convert <code>&self</code> into a <code>Field</code> with the specified <code>metadata</code>.</p>
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<p>If <code>metadata</code> defines this field, then the field is returned. Otherwise,
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this returns <code>None</code>.</p>
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</div></details></div><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-AsField-for-str" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tracing/field.rs.html#161-166" title="goto source code">[src]</a></div><a href="#impl-AsField-for-str" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.AsField.html" title="trait tracing::field::AsField">AsField</a> for <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.str.html">str</a></h3></div></summary><div class="impl-items"><div id="method.as_field" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tracing/field.rs.html#163-165" title="goto source code">[src]</a></div><a href="#method.as_field" class="anchor"></a><h4 class="code-header">fn <a href="#tymethod.as_field" class="fnname">as_field</a>(&self, metadata: &<a class="struct" href="../struct.Metadata.html" title="struct tracing::Metadata">Metadata</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Field.html" title="struct tracing::field::Field">Field</a>></h4></div></div></details><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><div id="impl-AsField" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tracing/field.rs.html#139-148" title="goto source code">[src]</a></div><a href="#impl-AsField" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="trait.AsField.html" title="trait tracing::field::AsField">AsField</a> for <a class="struct" href="struct.Field.html" title="struct tracing::field::Field">Field</a></h3></div><div id="impl-AsField-1" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tracing/field.rs.html#150-159" title="goto source code">[src]</a></div><a href="#impl-AsField-1" class="anchor"></a><h3 class="code-header in-band">impl<'a> <a class="trait" href="trait.AsField.html" title="trait tracing::field::AsField">AsField</a> for &'a <a class="struct" href="struct.Field.html" title="struct tracing::field::Field">Field</a></h3></div></div><script type="text/javascript" src="../../implementors/tracing/field/trait.AsField.js" async></script></section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="tracing" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.59.0 (9d1b2106e 2022-02-23)" ></div>
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