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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="An owned version of `Entered`, a guard representing a span which has been entered and is currently executing."><title>EnteredSpan in tracing::span - Rust</title><script> if (window.location.protocol !== "file:") document.write(`<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" 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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" title="show sidebar"></button><a class="logo-container" href="../../tracing/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/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing/index.html">tracing</a><span class="version">0.1.40</span></h2></div><h2 class="location"><a href="#">EnteredSpan</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.exit">exit</a></li><li><a href="#method.id">id</a></li></ul><h3><a href="#deref-methods-Span">Methods from Deref<Target=Span></a></h3><ul class="block deref-methods"><li><a href="#method.enter">enter</a></li><li><a href="#method.field">field</a></li><li><a href="#method.follows_from">follows_from</a></li><li><a href="#method.has_field">has_field</a></li><li><a href="#method.id-1">id</a></li><li><a href="#method.in_scope">in_scope</a></li><li><a href="#method.is_disabled">is_disabled</a></li><li><a href="#method.is_none">is_none</a></li><li><a href="#method.metadata">metadata</a></li><li><a href="#method.record">record</a></li><li><a href="#method.record_all">record_all</a></li><li><a href="#method.with_subscriber">with_subscriber</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-EnteredSpan">Debug</a></li><li><a href="#impl-Deref-for-EnteredSpan">Deref</a></li><li><a href="#impl-Drop-for-EnteredSpan">Drop</a></li><li><a href="#impl-From%3C%26EnteredSpan%3E-for-Option%3C%26Id%3E">From<&'a EnteredSpan></a></li><li><a href="#impl-From%3C%26EnteredSpan%3E-for-Option%3CId%3E">From<&'a EnteredSpan></a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-RefUnwindSafe-for-EnteredSpan">!RefUnwindSafe</a></li><li><a href="#impl-Send-for-EnteredSpan">!Send</a></li><li><a href="#impl-UnwindSafe-for-EnteredSpan">!UnwindSafe</a></li><li><a href="#impl-Freeze-for-EnteredSpan">Freeze</a></li><li><a href="#impl-Sync-for-EnteredSpan">Sync</a></li><li><a href="#impl-Unpin-for-EnteredSpan">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Instrument-for-T">Instrument</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li><li><a href="#impl-WithSubscriber-for-T">WithSubscriber</a></li></ul></section><h2><a href="index.html">In tracing::span</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../tracing/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</a>::<wbr><a href="index.html">span</a>::<wbr><a class="struct" href="#">EnteredSpan</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/span.rs.html#401-411">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct EnteredSpan { <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>An owned version of <a href="struct.Entered.html" title="struct tracing::span::Entered"><code>Entered</code></a>, a guard representing a span which has been
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entered and is currently executing.</p>
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<p>When the guard is dropped, the span will be exited.</p>
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<p>This is returned by the <a href="../struct.Span.html#method.entered" title="method tracing::Span::entered"><code>Span::entered</code></a> function.</p>
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</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-EnteredSpan" class="impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1540-1554">source</a><a href="#impl-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.id" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1542-1544">source</a><h4 class="code-header">pub fn <a href="#method.id" class="fn">id</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Id.html" title="struct tracing::span::Id">Id</a>></h4></section></summary><div class="docblock"><p>Returns this span’s <code>Id</code>, if it is enabled.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.exit" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1548-1553">source</a><h4 class="code-header">pub fn <a href="#method.exit" class="fn">exit</a>(self) -> <a class="struct" href="../struct.Span.html" title="struct tracing::Span">Span</a></h4></section></summary><div class="docblock"><p>Exits this span, returning the underlying <a href="../struct.Span.html" title="struct tracing::Span"><code>Span</code></a>.</p>
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</div></details></div></details></div><h2 id="deref-methods-Span" class="section-header"><span>Methods from <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a><Target = <a class="struct" href="../struct.Span.html" title="struct tracing::Span">Span</a>></span><a href="#deref-methods-Span" class="anchor">§</a></h2><div id="deref-methods-Span-1" class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.enter" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#785-788">source</a><h4 class="code-header">pub fn <a href="#method.enter" class="fn">enter</a>(&self) -> <a class="struct" href="struct.Entered.html" title="struct tracing::span::Entered">Entered</a><'_></h4></section></summary><div class="docblock"><p>Enters this span, returning a guard that will exit the span when dropped.</p>
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<p>If this span is enabled by the current subscriber, then this function will
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call <a href="../trait.Subscriber.html#tymethod.enter" title="method tracing::Subscriber::enter"><code>Subscriber::enter</code></a> with the span’s <a href="struct.Id.html" title="struct tracing::span::Id"><code>Id</code></a>, and dropping the guard
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will call <a href="../trait.Subscriber.html#tymethod.exit" title="method tracing::Subscriber::exit"><code>Subscriber::exit</code></a>. If the span is disabled, this does
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nothing.</p>
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<h5 id="in-asynchronous-code"><a class="doc-anchor" href="#in-asynchronous-code">§</a>In Asynchronous Code</h5>
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<p><strong>Warning</strong>: in asynchronous code that uses <a href="https://rust-lang.github.io/async-book/01_getting_started/04_async_await_primer.html">async/await syntax</a>,
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<code>Span::enter</code> should be used very carefully or avoided entirely. Holding
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the drop guard returned by <code>Span::enter</code> across <code>.await</code> points will
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result in incorrect traces. For example,</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">async fn </span>my_async_function() {
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<span class="kw">let </span>span = <span class="macro">info_span!</span>(<span class="string">"my_async_function"</span>);
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<span class="comment">// WARNING: This span will remain entered until this
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// guard is dropped...
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</span><span class="kw">let </span>_enter = span.enter();
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<span class="comment">// ...but the `await` keyword may yield, causing the
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// runtime to switch to another task, while remaining in
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// this span!
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</span>some_other_async_function().<span class="kw">await
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</span><span class="comment">// ...
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</span>}</code></pre></div>
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<p>The drop guard returned by <code>Span::enter</code> exits the span when it is
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dropped. When an async function or async block yields at an <code>.await</code>
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point, the current scope is <em>exited</em>, but values in that scope are
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<strong>not</strong> dropped (because the async block will eventually resume
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execution from that await point). This means that <em>another</em> task will
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begin executing while <em>remaining</em> in the entered span. This results in
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an incorrect trace.</p>
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<p>Instead of using <code>Span::enter</code> in asynchronous code, prefer the
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following:</p>
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<ul>
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<li>
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<p>To enter a span for a synchronous section of code within an async
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block or function, prefer <a href="../struct.Span.html#method.in_scope" title="method tracing::Span::in_scope"><code>Span::in_scope</code></a>. Since <code>in_scope</code> takes a
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synchronous closure and exits the span when the closure returns, the
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span will always be exited before the next await point. For example:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">async fn </span>my_async_function() {
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<span class="kw">let </span>span = <span class="macro">info_span!</span>(<span class="string">"my_async_function"</span>);
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<span class="kw">let </span>some_value = span.in_scope(|| {
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<span class="comment">// run some synchronous code inside the span...
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</span>});
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<span class="comment">// This is okay! The span has already been exited before we reach
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// the await point.
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</span>some_other_async_function(some_value).<span class="kw">await</span>;
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<span class="comment">// ...
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</span>}</code></pre></div>
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</li>
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<li>
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<p>For instrumenting asynchronous code, <code>tracing</code> provides the
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<a href="../trait.Instrument.html" title="trait tracing::Instrument"><code>Future::instrument</code> combinator</a> for
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attaching a span to a future (async function or block). This will
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enter the span <em>every</em> time the future is polled, and exit it whenever
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the future yields.</p>
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<p><code>Instrument</code> can be used with an async block inside an async function:</p>
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<div class="example-wrap ignore"><a href="#" class="tooltip" title="This example is not tested">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::Instrument;
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<span class="kw">async fn </span>my_async_function() {
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<span class="kw">let </span>span = <span class="macro">info_span!</span>(<span class="string">"my_async_function"</span>);
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<span class="kw">async move </span>{
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<span class="comment">// This is correct! If we yield here, the span will be exited,
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// and re-entered when we resume.
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</span>some_other_async_function().<span class="kw">await</span>;
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<span class="comment">//more asynchronous code inside the span...
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</span>}
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<span class="comment">// instrument the async block with the span...
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</span>.instrument(span)
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<span class="comment">// ...and await it.
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</span>.<span class="kw">await
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</span>}</code></pre></div>
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<p>It can also be used to instrument calls to async functions at the
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callsite:</p>
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<div class="example-wrap ignore"><a href="#" class="tooltip" title="This example is not tested">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::Instrument;
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<span class="kw">async fn </span>my_async_function() {
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<span class="kw">let </span>some_value = some_other_async_function()
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.instrument(<span class="macro">debug_span!</span>(<span class="string">"some_other_async_function"</span>))
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.<span class="kw">await</span>;
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<span class="comment">// ...
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</span>}</code></pre></div>
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</li>
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<li>
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<p>The <a href="../attr.instrument.html" title="attr tracing::instrument"><code>#[instrument]</code> attribute macro</a> can automatically generate
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correct code when used on an async function:</p>
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<div class="example-wrap ignore"><a href="#" class="tooltip" title="This example is not tested">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="attr">#[tracing::instrument(level = <span class="string">"info"</span>)]
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</span><span class="kw">async fn </span>my_async_function() {
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<span class="comment">// This is correct! If we yield here, the span will be exited,
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// and re-entered when we resume.
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</span>some_other_async_function().<span class="kw">await</span>;
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<span class="comment">// ...
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</span>}</code></pre></div>
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</li>
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</ul>
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<h5 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span = <span class="macro">span!</span>(Level::INFO, <span class="string">"my_span"</span>);
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<span class="kw">let </span>guard = span.enter();
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<span class="comment">// code here is within the span
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</span>drop(guard);
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<span class="comment">// code here is no longer within the span
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</span></code></pre></div>
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<p>Guards need not be explicitly dropped:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">fn </span>my_function() -> String {
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<span class="comment">// enter a span for the duration of this function.
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</span><span class="kw">let </span>span = <span class="macro">trace_span!</span>(<span class="string">"my_function"</span>);
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<span class="kw">let </span>_enter = span.enter();
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<span class="comment">// anything happening in functions we call is still inside the span...
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</span>my_other_function();
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<span class="comment">// returning from the function drops the guard, exiting the span.
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</span><span class="kw">return </span><span class="string">"Hello world"</span>.to_owned();
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}
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<span class="kw">fn </span>my_other_function() {
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<span class="comment">// ...
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</span>}</code></pre></div>
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<p>Sub-scopes may be created to limit the duration for which the span is
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entered:</p>
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||
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span = <span class="macro">info_span!</span>(<span class="string">"my_great_span"</span>);
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||
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{
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<span class="kw">let </span>_enter = span.enter();
|
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<span class="comment">// this event occurs inside the span.
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</span><span class="macro">info!</span>(<span class="string">"i'm in the span!"</span>);
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<span class="comment">// exiting the scope drops the guard, exiting the span.
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</span>}
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<span class="comment">// this event is not inside the span.
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</span><span class="macro">info!</span>(<span class="string">"i'm outside the span!"</span>)</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.in_scope" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1100-1103">source</a><h4 class="code-header">pub fn <a href="#method.in_scope" class="fn">in_scope</a><F: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> T, T>(&self, f: F) -> T</h4></section></summary><div class="docblock"><p>Executes the given function in the context of this span.</p>
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<p>If this span is enabled, then this function enters the span, invokes <code>f</code>
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and then exits the span. If the span is disabled, <code>f</code> will still be
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invoked, but in the context of the currently-executing span (if there is
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one).</p>
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||
<p>Returns the result of evaluating <code>f</code>.</p>
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||
<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
|
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>my_span = <span class="macro">span!</span>(Level::TRACE, <span class="string">"my_span"</span>);
|
||
|
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my_span.in_scope(|| {
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||
<span class="comment">// this event occurs within the span.
|
||
</span><span class="macro">trace!</span>(<span class="string">"i'm in the span!"</span>);
|
||
});
|
||
|
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<span class="comment">// this event occurs outside the span.
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||
</span><span class="macro">trace!</span>(<span class="string">"i'm not in the span!"</span>);</code></pre></div>
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||
<p>Calling a function and returning the result:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">fn </span>hello_world() -> String {
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<span class="string">"Hello world!"</span>.to_owned()
|
||
}
|
||
|
||
<span class="kw">let </span>span = <span class="macro">info_span!</span>(<span class="string">"hello_world"</span>);
|
||
<span class="comment">// the span will be entered for the duration of the call to
|
||
// `hello_world`.
|
||
</span><span class="kw">let </span>a_string = span.in_scope(hello_world);</code></pre></div>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.field" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1107-1112">source</a><h4 class="code-header">pub fn <a href="#method.field" class="fn">field</a><Q>(&self, field: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../field/struct.Field.html" title="struct tracing::field::Field">Field</a>><div class="where">where
|
||
Q: <a class="trait" href="../field/trait.AsField.html" title="trait tracing::field::AsField">AsField</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns a <a href="../field/struct.Field.html" title="struct tracing::field::Field"><code>Field</code></a> for the field with the
|
||
given <code>name</code>, if one exists,</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.has_field" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1117-1122">source</a><h4 class="code-header">pub fn <a href="#method.has_field" class="fn">has_field</a><Q>(&self, field: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Q</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a><div class="where">where
|
||
Q: <a class="trait" href="../field/trait.AsField.html" title="trait tracing::field::AsField">AsField</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns true if this <code>Span</code> has a field for the given
|
||
<a href="../field/struct.Field.html" title="struct tracing::field::Field"><code>Field</code></a> or field name.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.record" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1194-1210">source</a><h4 class="code-header">pub fn <a href="#method.record" class="fn">record</a><Q, V>(&self, field: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Q</a>, value: V) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Self</a><div class="where">where
|
||
Q: <a class="trait" href="../field/trait.AsField.html" title="trait tracing::field::AsField">AsField</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
|
||
V: <a class="trait" href="../trait.Value.html" title="trait tracing::Value">Value</a>,</div></h4></section></summary><div class="docblock"><p>Records that the field described by <code>field</code> has the value <code>value</code>.</p>
|
||
<p>This may be used with <a href="../field/struct.Empty.html" title="struct tracing::field::Empty"><code>field::Empty</code></a> to declare fields whose values
|
||
are not known when the span is created, and record them later:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::{trace_span, field};
|
||
|
||
<span class="comment">// Create a span with two fields: `greeting`, with the value "hello world", and
|
||
// `parting`, without a value.
|
||
</span><span class="kw">let </span>span = <span class="macro">trace_span!</span>(<span class="string">"my_span"</span>, greeting = <span class="string">"hello world"</span>, parting = field::Empty);
|
||
|
||
<span class="comment">// ...
|
||
|
||
// Now, record a value for parting as well.
|
||
// (note that the field name is passed as a string slice)
|
||
</span>span.record(<span class="string">"parting"</span>, <span class="string">"goodbye world!"</span>);</code></pre></div>
|
||
<p>However, it may also be used to record a <em>new</em> value for a field whose
|
||
value was already recorded:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::info_span;
|
||
|
||
<span class="comment">// Initially, let's assume that our attempt to do something is going okay...
|
||
</span><span class="kw">let </span>span = <span class="macro">info_span!</span>(<span class="string">"doing_something"</span>, is_okay = <span class="bool-val">true</span>);
|
||
<span class="kw">let </span>_e = span.enter();
|
||
|
||
<span class="kw">match </span>do_something() {
|
||
<span class="prelude-val">Ok</span>(something) => {
|
||
<span class="comment">// ...
|
||
</span>}
|
||
<span class="prelude-val">Err</span>(<span class="kw">_</span>) => {
|
||
<span class="comment">// Things are no longer okay!
|
||
</span>span.record(<span class="string">"is_okay"</span>, <span class="bool-val">false</span>);
|
||
}
|
||
}</code></pre></div>
|
||
<pre class="ignore" style="white-space:normal;font:inherit;">
|
||
<strong>Note</strong>: The fields associated with a span are part
|
||
of its <a href="../struct.Metadata.html"><code>Metadata</code></a>.
|
||
The <a href="../struct.Metadata.html"><code>Metadata</code></a>
|
||
describing a particular span is constructed statically when the span
|
||
is created and cannot be extended later to add new fields. Therefore,
|
||
you cannot record a value for a field that was not specified when the
|
||
span was created:
|
||
</pre>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::{trace_span, field};
|
||
|
||
<span class="comment">// Create a span with two fields: `greeting`, with the value "hello world", and
|
||
// `parting`, without a value.
|
||
</span><span class="kw">let </span>span = <span class="macro">trace_span!</span>(<span class="string">"my_span"</span>, greeting = <span class="string">"hello world"</span>, parting = field::Empty);
|
||
|
||
<span class="comment">// ...
|
||
|
||
// Now, you try to record a value for a new field, `new_field`, which was not
|
||
// declared as `Empty` or populated when you created `span`.
|
||
// You won't get any error, but the assignment will have no effect!
|
||
</span>span.record(<span class="string">"new_field"</span>, <span class="string">"interesting_value_you_really_need"</span>);
|
||
|
||
<span class="comment">// Instead, all fields that may be recorded after span creation should be declared up front,
|
||
// using field::Empty when a value is not known, as we did for `parting`.
|
||
// This `record` call will indeed replace field::Empty with "you will be remembered".
|
||
</span>span.record(<span class="string">"parting"</span>, <span class="string">"you will be remembered"</span>);</code></pre></div>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.record_all" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1213-1235">source</a><h4 class="code-header">pub fn <a href="#method.record_all" class="fn">record_all</a>(&self, values: &<a class="struct" href="../field/struct.ValueSet.html" title="struct tracing::field::ValueSet">ValueSet</a><'_>) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Self</a></h4></section></summary><div class="docblock"><p>Records all the fields in the provided <code>ValueSet</code>.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_disabled" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1244-1246">source</a><h4 class="code-header">pub fn <a href="#method.is_disabled" class="fn">is_disabled</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if this span was disabled by the subscriber and does not
|
||
exist.</p>
|
||
<p>See also <a href="../struct.Span.html#method.is_none" title="method tracing::Span::is_none"><code>is_none</code></a>.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_none" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1259-1261">source</a><h4 class="code-header">pub fn <a href="#method.is_none" class="fn">is_none</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if this span was constructed by <a href="../struct.Span.html#method.none" title="associated function tracing::Span::none"><code>Span::none</code></a> and is
|
||
empty.</p>
|
||
<p>If <code>is_none</code> returns <code>true</code> for a given span, then <a href="../struct.Span.html#method.is_disabled" title="method tracing::Span::is_disabled"><code>is_disabled</code></a> will
|
||
also return <code>true</code>. However, when a span is disabled by the subscriber
|
||
rather than constructed by <code>Span::none</code>, this method will return
|
||
<code>false</code>, while <code>is_disabled</code> will return <code>true</code>.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.follows_from" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1310-1317">source</a><h4 class="code-header">pub fn <a href="#method.follows_from" class="fn">follows_from</a>(&self, from: impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Id.html" title="struct tracing::span::Id">Id</a>>>) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&Self</a></h4></section></summary><div class="docblock"><p>Indicates that the span with the given ID has an indirect causal
|
||
relationship with this span.</p>
|
||
<p>This relationship differs somewhat from the parent-child relationship: a
|
||
span may have any number of prior spans, rather than a single one; and
|
||
spans are not considered to be executing <em>inside</em> of the spans they
|
||
follow from. This means that a span may close even if subsequent spans
|
||
that follow from it are still open, and time spent inside of a
|
||
subsequent span should not be included in the time its precedents were
|
||
executing. This is used to model causal relationships such as when a
|
||
single future spawns several related background tasks, et cetera.</p>
|
||
<p>If this span is disabled, or the resulting follows-from relationship
|
||
would be invalid, this function will do nothing.</p>
|
||
<h5 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h5>
|
||
<p>Setting a <code>follows_from</code> relationship with a <code>Span</code>:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span1 = <span class="macro">span!</span>(Level::INFO, <span class="string">"span_1"</span>);
|
||
<span class="kw">let </span>span2 = <span class="macro">span!</span>(Level::DEBUG, <span class="string">"span_2"</span>);
|
||
span2.follows_from(span1);</code></pre></div>
|
||
<p>Setting a <code>follows_from</code> relationship with the current span:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span = <span class="macro">span!</span>(Level::INFO, <span class="string">"hello!"</span>);
|
||
span.follows_from(Span::current());</code></pre></div>
|
||
<p>Setting a <code>follows_from</code> relationship with a <code>Span</code> reference:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span = <span class="macro">span!</span>(Level::INFO, <span class="string">"hello!"</span>);
|
||
<span class="kw">let </span>curr = Span::current();
|
||
span.follows_from(<span class="kw-2">&</span>curr);</code></pre></div>
|
||
<p>Setting a <code>follows_from</code> relationship with an <code>Id</code>:</p>
|
||
|
||
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>span = <span class="macro">span!</span>(Level::INFO, <span class="string">"hello!"</span>);
|
||
<span class="kw">let </span>id = span.id();
|
||
span.follows_from(id);</code></pre></div>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.id-1" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1320-1322">source</a><h4 class="code-header">pub fn <a href="#method.id-1" class="fn">id</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Id.html" title="struct tracing::span::Id">Id</a>></h4></section></summary><div class="docblock"><p>Returns this span’s <code>Id</code>, if it is enabled.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.metadata" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1325-1327">source</a><h4 class="code-header">pub fn <a href="#method.metadata" class="fn">metadata</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'static <a class="struct" href="../struct.Metadata.html" title="struct tracing::Metadata">Metadata</a><'static>></h4></section></summary><div class="docblock"><p>Returns this span’s <code>Metadata</code>, if it is enabled.</p>
|
||
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method"><a class="src rightside" href="../../src/tracing/span.rs.html#1368-1372">source</a><h4 class="code-header">pub fn <a href="#method.with_subscriber" class="fn">with_subscriber</a><T>(
|
||
&self,
|
||
f: impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>((&<a class="struct" href="struct.Id.html" title="struct tracing::span::Id">Id</a>, &<a class="struct" href="../struct.Dispatch.html" title="struct tracing::Dispatch">Dispatch</a>)) -> T
|
||
) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></section></summary><div class="docblock"><p>Invokes a function with a reference to this span’s ID and subscriber.</p>
|
||
<p>if this span is enabled, the provided function is called, and the result is returned.
|
||
If the span is disabled, the function is not called, and this method returns <code>None</code>
|
||
instead.</p>
|
||
</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-EnteredSpan" class="impl"><a class="src rightside" href="../../src/tracing/span.rs.html#399">source</a><a href="#impl-Debug-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></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/span.rs.html#399">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.78.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Deref-for-EnteredSpan" class="impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1556-1563">source</a><a href="#impl-Deref-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl"><a href="#associatedtype.Target" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.78.0/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = <a class="struct" href="../struct.Span.html" title="struct tracing::Span">Span</a></h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1560-1562">source</a><a href="#method.deref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/ops/deref/trait.Deref.html#tymethod.deref" class="fn">deref</a>(&self) -> &<a class="struct" href="../struct.Span.html" title="struct tracing::Span">Span</a></h4></section></summary><div class='docblock'>Dereferences the value.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Drop-for-EnteredSpan" class="impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1572-1577">source</a><a href="#impl-Drop-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.drop" class="method trait-impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1574-1576">source</a><a href="#method.drop" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/ops/drop/trait.Drop.html#tymethod.drop" class="fn">drop</a>(&mut self)</h4></section></summary><div class='docblock'>Executes the destructor for this type. <a href="https://doc.rust-lang.org/1.78.0/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3C%26EnteredSpan%3E-for-Option%3C%26Id%3E" class="impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1443-1447">source</a><a href="#impl-From%3C%26EnteredSpan%3E-for-Option%3C%26Id%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><&'a <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a>> for <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><&'a <a class="struct" href="struct.Id.html" title="struct tracing::span::Id">Id</a>></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1444-1446">source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(span: &'a <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3C%26EnteredSpan%3E-for-Option%3CId%3E" class="impl"><a class="src rightside" href="../../src/tracing/span.rs.html#1449-1453">source</a><a href="#impl-From%3C%26EnteredSpan%3E-for-Option%3CId%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><&'a <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a>> for <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Id.html" title="struct tracing::span::Id">Id</a>></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="../../src/tracing/span.rs.html#1450-1452">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(span: &'a <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</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-Freeze-for-EnteredSpan" class="impl"><a href="#impl-Freeze-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section><section id="impl-RefUnwindSafe-for-EnteredSpan" class="impl"><a href="#impl-RefUnwindSafe-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section><section id="impl-Send-for-EnteredSpan" class="impl"><a href="#impl-Send-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section><section id="impl-Sync-for-EnteredSpan" class="impl"><a href="#impl-Sync-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section><section id="impl-Unpin-for-EnteredSpan" class="impl"><a href="#impl-Unpin-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section><section id="impl-UnwindSafe-for-EnteredSpan" class="impl"><a href="#impl-UnwindSafe-for-EnteredSpan" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.EnteredSpan.html" title="struct tracing::span::EnteredSpan">EnteredSpan</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
|
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.78.0/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/1.78.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
|
||
T: ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/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/1.78.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.78.0/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/1.78.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-2" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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||
</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<T> <a class="trait" href="../trait.Instrument.html" title="trait tracing::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#86-91">source</a><a href="#method.instrument" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Instrument.html#method.instrument" class="fn">instrument</a>(self, span: <a class="struct" href="../struct.Span.html" title="struct tracing::Span">Span</a>) -> <a class="struct" href="../instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a><Self> <a href="#" class="tooltip" data-notable-ty="Instrumented<Self>">ⓘ</a></h4></section></summary><div class='docblock'>Instruments this type with the provided <a href="../struct.Span.html" title="struct tracing::Span"><code>Span</code></a>, returning an
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<code>Instrumented</code> wrapper. <a href="../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#128-130">source</a><a href="#method.in_current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Instrument.html#method.in_current_span" class="fn">in_current_span</a>(self) -> <a class="struct" href="../instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a><Self> <a href="#" class="tooltip" data-notable-ty="Instrumented<Self>">ⓘ</a></h4></section></summary><div class='docblock'>Instruments this type with the <a href="../struct.Span.html#method.current" title="associated function tracing::Span::current">current</a> <a href="../struct.Span.html" title="struct tracing::Span"><code>Span</code></a>, returning an
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<code>Instrumented</code> wrapper. <a href="../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/1.78.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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||
U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</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/1.78.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</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/1.78.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</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/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/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="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</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/1.78.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/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/1.78.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/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="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<T> <a class="trait" href="../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-1" class="method trait-impl"><a class="src rightside" href="../../src/tracing/instrument.rs.html#176-184">source</a><a href="#method.with_subscriber-1" class="anchor">§</a><h4 class="code-header">fn <a href="../instrument/trait.WithSubscriber.html#method.with_subscriber" class="fn">with_subscriber</a><S>(self, subscriber: S) -> <a class="struct" href="../instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self> <a href="#" class="tooltip" data-notable-ty="WithDispatch<Self>">ⓘ</a><div class="where">where
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S: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../struct.Dispatch.html" title="struct tracing::Dispatch">Dispatch</a>>,</div></h4></section></summary><div class='docblock'>Attaches the provided <a href="../trait.Subscriber.html" title="trait tracing::Subscriber"><code>Subscriber</code></a> to this type, returning a
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<a href="../instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../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#228-233">source</a><a href="#method.with_current_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../instrument/trait.WithSubscriber.html#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -> <a class="struct" href="../instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self> <a href="#" class="tooltip" data-notable-ty="WithDispatch<Self>">ⓘ</a></h4></section></summary><div class='docblock'>Attaches the current <a href="../dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> <a href="../trait.Subscriber.html" title="trait tracing::Subscriber"><code>Subscriber</code></a> to this type, returning a
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<a href="../instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../instrument/trait.WithSubscriber.html#method.with_current_subscriber">Read more</a></div></details></div></details></div><script type="text/json" id="notable-traits-data">{"Instrumented<Self>":"<h3>Notable traits for <code><a class=\"struct\" href=\"../instrument/struct.Instrumented.html\" title=\"struct tracing::instrument::Instrumented\">Instrumented</a><T></code></h3><pre><code><div class=\"where\">impl<T: <a class=\"trait\" href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html\" title=\"trait core::future::future::Future\">Future</a>> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html\" title=\"trait core::future::future::Future\">Future</a> for <a class=\"struct\" href=\"../instrument/struct.Instrumented.html\" title=\"struct tracing::instrument::Instrumented\">Instrumented</a><T></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html#associatedtype.Output\" class=\"associatedtype\">Output</a> = T::<a class=\"associatedtype\" href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html#associatedtype.Output\" title=\"type core::future::future::Future::Output\">Output</a>;</div>","WithDispatch<Self>":"<h3>Notable traits for <code><a class=\"struct\" href=\"../instrument/struct.WithDispatch.html\" title=\"struct tracing::instrument::WithDispatch\">WithDispatch</a><T></code></h3><pre><code><div class=\"where\">impl<T: <a class=\"trait\" href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html\" title=\"trait core::future::future::Future\">Future</a>> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html\" title=\"trait core::future::future::Future\">Future</a> for <a class=\"struct\" href=\"../instrument/struct.WithDispatch.html\" title=\"struct tracing::instrument::WithDispatch\">WithDispatch</a><T></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html#associatedtype.Output\" class=\"associatedtype\">Output</a> = T::<a class=\"associatedtype\" href=\"https://doc.rust-lang.org/1.78.0/core/future/future/trait.Future.html#associatedtype.Output\" title=\"type core::future::future::Future::Output\">Output</a>;</div>"}</script></section></div></main></body></html> |