| <!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`."><meta name="keywords" content="rust, rustlang, rust-lang, tracing_attributes"><title>tracing_attributes - 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="../crates.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 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">☰</button><a class="sidebar-logo" href="../tracing_attributes/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_attributes/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="#">Crate tracing_attributes</a></h2><div class="sidebar-elems"><ul class="block"><li class="version">Version 0.1.24</li><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><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">Crate <a class="mod" href="#">tracing_attributes</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_attributes/lib.rs.html#1-695">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><details class="rustdoc-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"><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 href="#usage">Usage</a></h3> |
| <p>In the <code>Cargo.toml</code>:</p> |
| <div class="example-wrap"><pre class="language-toml"><code>[dependencies] |
| tracing-attributes = "0.1.24"</code></pre></div> |
| <p>The <a href="attr.instrument.html"><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="attribute">#[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 href="#supported-rust-versions">Supported Rust Versions</a></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="small-section-header"><a href="#attributes">Attribute Macros</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="attr" href="attr.instrument.html" title="tracing_attributes::instrument attr">instrument</a></div><div class="item-right 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></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="tracing_attributes" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
