| <!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="Metadata describing a span or event."><meta name="keywords" content="rust, rustlang, rust-lang, Metadata"><title>Metadata in tracing_core - 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" href="../normalize.css"><link rel="stylesheet" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../ayu.css" disabled><link rel="stylesheet" href="../dark.css" disabled><link rel="stylesheet" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><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 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">☰</button><a class="sidebar-logo" href="../tracing_core/index.html"><div class="logo-container"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../tracing_core/index.html"><div class="logo-container"> |
| <img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></div></a><h2 class="location"><a href="#">Metadata</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><li><a href="#method.callsite">callsite</a></li><li><a href="#method.fields">fields</a></li><li><a href="#method.file">file</a></li><li><a href="#method.is_event">is_event</a></li><li><a href="#method.is_span">is_span</a></li><li><a href="#method.level">level</a></li><li><a href="#method.line">line</a></li><li><a href="#method.module_path">module_path</a></li><li><a href="#method.name">name</a></li><li><a href="#method.new">new</a></li><li><a href="#method.target">target</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-Debug-for-Metadata%3C%27a%3E">Debug</a></li><li><a href="#impl-Eq-for-Metadata%3C%27a%3E">Eq</a></li><li><a href="#impl-PartialEq%3CMetadata%3C%27a%3E%3E-for-Metadata%3C%27a%3E">PartialEq<Metadata<'a>></a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-Metadata%3C%27a%3E">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-Metadata%3C%27a%3E">Send</a></li><li><a href="#impl-Sync-for-Metadata%3C%27a%3E">Sync</a></li><li><a href="#impl-Unpin-for-Metadata%3C%27a%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Metadata%3C%27a%3E">!UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-Metadata%3C%27a%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-Metadata%3C%27a%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-Metadata%3C%27a%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-Metadata%3C%27a%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-Metadata%3C%27a%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-Metadata%3C%27a%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-Metadata%3C%27a%3E">TryInto<U></a></li></ul></section><h2><a href="index.html">In tracing_core</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Struct <a href="index.html">tracing_core</a>::<wbr><a class="struct" href="#">Metadata</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></h1><span class="out-of-band"><a class="srclink" href="../src/tracing_core/metadata.rs.html#57-86">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct Metadata<'a> { /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Metadata describing a <a href="span/index.html">span</a> or <a href="event/index.html">event</a>.</p> |
| <p>All spans and events have the following metadata:</p> |
| <ul> |
| <li>A <a href="struct.Metadata.html#method.name">name</a>, represented as a static string.</li> |
| <li>A <a href="struct.Metadata.html#method.target">target</a>, a string that categorizes part of the system where the span |
| or event occurred. The <code>tracing</code> macros default to using the module |
| path where the span or event originated as the target, but it may be |
| overridden.</li> |
| <li>A <a href="struct.Metadata.html#method.level">verbosity level</a>. This determines how verbose a given span or event |
| is, and allows enabling or disabling more verbose diagnostics |
| situationally. See the documentation for the <a href="struct.Level.html" title="Level"><code>Level</code></a> type for details.</li> |
| <li>The names of the <a href="struct.Metadata.html#method.fields">fields</a> defined by the span or event.</li> |
| <li>Whether the metadata corresponds to a span or event.</li> |
| </ul> |
| <p>In addition, the following optional metadata describing the source code |
| location where the span or event originated <em>may</em> be provided:</p> |
| <ul> |
| <li>The <a href="struct.Metadata.html#method.file">file name</a></li> |
| <li>The <a href="struct.Metadata.html#method.line">line number</a></li> |
| <li>The <a href="struct.Metadata.html#method.module_path">module path</a></li> |
| </ul> |
| <p>Metadata is used by <a href="trait.Subscriber.html"><code>Subscriber</code></a>s when filtering spans and events, and it |
| may also be used as part of their data payload.</p> |
| <p>When created by the <code>event!</code> or <code>span!</code> macro, the metadata describing a |
| particular event or span is constructed statically and exists as a single |
| static instance. Thus, the overhead of creating the metadata is |
| <em>significantly</em> lower than that of creating the actual span. Therefore, |
| filtering is based on metadata, rather than on the constructed span.</p> |
| <h3 id="equality"><a href="#equality">Equality</a></h3> |
| <p>In well-behaved applications, two <code>Metadata</code> with equal |
| <a href="struct.Metadata.html#method.callsite">callsite identifiers</a> will be equal in all other ways (i.e., have the same |
| <code>name</code>, <code>target</code>, etc.). Consequently, in release builds, <a href="struct.Metadata.html#method.eq" title="Metadata::eq"><code>Metadata::eq</code></a> |
| <em>only</em> checks that its arguments have equal callsites. However, the equality |
| of <code>Metadata</code>’s other fields is checked in debug builds.</p> |
| </div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#250-334">source</a><a href="#impl-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.new" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#253-273">source</a><h4 class="code-header">pub const fn <a href="#method.new" class="fnname">new</a>(<br> name: &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>,<br> target: &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>,<br> level: <a class="struct" href="struct.Level.html" title="struct tracing_core::Level">Level</a>,<br> file: <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>>,<br> line: <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>>,<br> module_path: <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>>,<br> fields: <a class="struct" href="field/struct.FieldSet.html" title="struct tracing_core::field::FieldSet">FieldSet</a>,<br> kind: <a class="struct" href="metadata/struct.Kind.html" title="struct tracing_core::metadata::Kind">Kind</a><br>) -> Self</h4></section></summary><div class="docblock"><p>Construct new metadata for a span or event, with a name, target, level, field |
| names, and optional source code location.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fields" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#277-279">source</a><h4 class="code-header">pub fn <a href="#method.fields" class="fnname">fields</a>(&self) -> &<a class="struct" href="field/struct.FieldSet.html" title="struct tracing_core::field::FieldSet">FieldSet</a></h4></section></summary><div class="docblock"><p>Returns the names of the fields on the described span or event.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.level" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#282-284">source</a><h4 class="code-header">pub fn <a href="#method.level" class="fnname">level</a>(&self) -> &<a class="struct" href="struct.Level.html" title="struct tracing_core::Level">Level</a></h4></section></summary><div class="docblock"><p>Returns the level of verbosity of the described span or event.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.name" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#287-289">source</a><h4 class="code-header">pub fn <a href="#method.name" class="fnname">name</a>(&self) -> &'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Returns the name of the span.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.target" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#296-298">source</a><h4 class="code-header">pub fn <a href="#method.target" class="fnname">target</a>(&self) -> &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></h4></section></summary><div class="docblock"><p>Returns a string describing the part of the system where the span or |
| event that this metadata describes occurred.</p> |
| <p>Typically, this is the module path, but alternate targets may be set |
| when spans or events are constructed.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.module_path" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#302-304">source</a><h4 class="code-header">pub fn <a href="#method.module_path" class="fnname">module_path</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>></h4></section></summary><div class="docblock"><p>Returns the path to the Rust module where the span occurred, or |
| <code>None</code> if the module path is unknown.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.file" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#308-310">source</a><h4 class="code-header">pub fn <a href="#method.file" class="fnname">file</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>></h4></section></summary><div class="docblock"><p>Returns the name of the source code file where the span |
| occurred, or <code>None</code> if the file is unknown</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.line" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#314-316">source</a><h4 class="code-header">pub fn <a href="#method.line" class="fnname">line</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a>></h4></section></summary><div class="docblock"><p>Returns the line number in the source code file where the span |
| occurred, or <code>None</code> if the line number is unknown.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.callsite" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#321-323">source</a><h4 class="code-header">pub fn <a href="#method.callsite" class="fnname">callsite</a>(&self) -> <a class="struct" href="callsite/struct.Identifier.html" title="struct tracing_core::callsite::Identifier">Identifier</a></h4></section></summary><div class="docblock"><p>Returns an opaque <code>Identifier</code> that uniquely identifies the callsite |
| this <code>Metadata</code> originated from.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_event" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#326-328">source</a><h4 class="code-header">pub fn <a href="#method.is_event" class="fnname">is_event</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if the callsite kind is <code>Event</code>.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_span" class="method has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#331-333">source</a><h4 class="code-header">pub fn <a href="#method.is_span" class="fnname">is_span</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Return true if the callsite kind is <code>Span</code>.</p> |
| </div></details></div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Debug-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#336-367">source</a><a href="#impl-Debug-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#337-366">source</a><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-PartialEq%3CMetadata%3C%27a%3E%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#446-498">source</a><a href="#impl-PartialEq%3CMetadata%3C%27a%3E%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a><<a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a>> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#448-497">source</a><a href="#method.eq" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq" class="fnname">eq</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used |
| by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/cmp.rs.html#227">source</a></span><a href="#method.ne" class="anchor"></a><h4 class="code-header">const fn <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne" class="fnname">ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Rhs) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>This method tests for <code>!=</code>. The default implementation is almost always |
| sufficient, and should not be overridden without very good reason. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne">Read more</a></div></details></div></details><section id="impl-Eq-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="../src/tracing_core/metadata.rs.html#444">source</a><a href="#impl-Eq-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-Metadata%3C%27a%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> !<a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section><section id="impl-Send-for-Metadata%3C%27a%3E" class="impl has-srclink"><a href="#impl-Send-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section><section id="impl-Sync-for-Metadata%3C%27a%3E" class="impl has-srclink"><a href="#impl-Sync-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section><section id="impl-Unpin-for-Metadata%3C%27a%3E" class="impl has-srclink"><a href="#impl-Unpin-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section><section id="impl-UnwindSafe-for-Metadata%3C%27a%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<'a> !<a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Metadata.html" title="struct tracing_core::Metadata">Metadata</a><'a></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#200">source</a><a href="#impl-Any-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#201">source</a><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/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/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#211">source</a><a href="#impl-Borrow%3CT%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213">source</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#220">source</a><a href="#impl-BorrowMut%3CT%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#221">source</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#733">source</a><a href="#impl-From%3CT%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#736">source</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#717">source</a><a href="#impl-Into%3CU%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#725">source</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> 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/nightly/core/convert/trait.From.html" title="From">From</a><T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#775">source</a><a href="#impl-TryFrom%3CU%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/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="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#781">source</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-Metadata%3C%27a%3E" class="impl has-srclink"><a class="srclink rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#760">source</a><a href="#impl-TryInto%3CU%3E-for-Metadata%3C%27a%3E" class="anchor"></a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/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="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#766">source</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="tracing_core" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
