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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="A procedural macro attribute for instrumenting functions with `tracing`."><title>tracing_attributes - 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" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2">`)</script><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-e935ef01ae1c1829.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="tracing_attributes" data-themes="" data-resource-suffix="" data-rustdoc-version="1.78.0 (9b00956e5 2024-04-29)" data-channel="1.78.0" data-search-js="search-42d8da7a6b9792c2.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-4c98445ec4002617.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-12cf3b4f4f9dc36d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-04d5337699b92874.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[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_attributes/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_attributes/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../tracing_attributes/index.html">tracing_attributes</a><span class="version">0.1.27</span></h2></div><div class="sidebar-elems"><ul class="block">
<li><a id="all-types" href="all.html">All Items</a></li></ul><section><ul class="block"><li><a href="#attributes">Attribute Macros</a></li></ul></section></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../tracing_attributes/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>Crate <a class="mod" href="#">tracing_attributes</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_attributes/lib.rs.html#1-695">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A procedural macro attribute for instrumenting functions with <a href="https://crates.io/crates/tracing"><code>tracing</code></a>.</p>
<p><a href="https://crates.io/crates/tracing"><code>tracing</code></a> is a framework for instrumenting Rust programs to collect
structured, event-based diagnostic information. This crate provides the
<a href="attr.instrument.html" title="attr tracing_attributes::instrument"><code>#[instrument]</code></a> procedural macro attribute.</p>
<p>Note that this macro is also re-exported by the main <code>tracing</code> crate.</p>
<p><em>Compiler support: <a href="#supported-rust-versions">requires <code>rustc</code> 1.56+</a></em></p>
<h3 id="usage"><a class="doc-anchor" href="#usage">§</a>Usage</h3>
<p>In the <code>Cargo.toml</code>:</p>
<div class="example-wrap"><pre class="language-toml"><code>[dependencies]
tracing-attributes = &quot;0.1.24&quot;
</code></pre></div>
<p>The <a href="attr.instrument.html" title="attr tracing_attributes::instrument"><code>#[instrument]</code></a> attribute can now be added to a function
to automatically create and enter <code>tracing</code> <a href="https://docs.rs/tracing/latest/tracing/span/index.html">span</a> when that function is
called. For example:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::instrument;
<span class="attr">#[instrument]
</span><span class="kw">pub fn </span>my_function(my_arg: usize) {
<span class="comment">// ...
</span>}
</code></pre></div>
<h3 id="supported-rust-versions"><a class="doc-anchor" href="#supported-rust-versions">§</a>Supported Rust Versions</h3>
<p>Tracing is built against the latest stable release. The minimum supported
version is 1.56. The current Tracing version is not guaranteed to build on
Rust versions earlier than the minimum supported version.</p>
<p>Tracing follows the same compiler support policies as the rest of the Tokio
project. The current stable Rust compiler and the three most recent minor
versions before it will always be supported. For example, if the current
stable compiler version is 1.69, the minimum supported version will not be
increased past 1.66, three minor versions prior. Increasing the minimum
supported compiler version is not considered a semver breaking change as
long as doing so complies with this policy.</p>
</div></details><h2 id="attributes" class="section-header">Attribute Macros<a href="#attributes" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="attr" href="attr.instrument.html" title="attr tracing_attributes::instrument">instrument</a></div><div class="desc docblock-short">Instruments a function to create and enter a <code>tracing</code> <a href="https://docs.rs/tracing/latest/tracing/span/index.html">span</a> every time
the function is called.</div></li></ul></section></div></main></body></html>
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