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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 `Layer` that logs formatted representations of `tracing` events."><title>Layer in tracing_subscriber::fmt - Rust</title><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"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tracing_subscriber" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.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 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="logo-container" href="../../tracing_subscriber/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_subscriber/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../../tracing_subscriber/index.html">tracing_subscriber</a><span class="version">0.3.18</span></h2></div><h2 class="location"><a href="#">Layer</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.compact">compact</a></li><li><a href="#method.event_format">event_format</a></li><li><a href="#method.fmt_fields">fmt_fields</a></li><li><a href="#method.log_internal_errors">log_internal_errors</a></li><li><a href="#method.map_event_format">map_event_format</a></li><li><a href="#method.map_fmt_fields">map_fmt_fields</a></li><li><a href="#method.map_writer">map_writer</a></li><li><a href="#method.new">new</a></li><li><a href="#method.pretty">pretty</a></li><li><a href="#method.set_ansi">set_ansi</a></li><li><a href="#method.with_ansi">with_ansi</a></li><li><a href="#method.with_file">with_file</a></li><li><a href="#method.with_level">with_level</a></li><li><a href="#method.with_line_number">with_line_number</a></li><li><a href="#method.with_span_events">with_span_events</a></li><li><a href="#method.with_target">with_target</a></li><li><a href="#method.with_test_writer">with_test_writer</a></li><li><a href="#method.with_thread_ids">with_thread_ids</a></li><li><a href="#method.with_thread_names">with_thread_names</a></li><li><a href="#method.with_timer">with_timer</a><
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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_subscriber/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_subscriber</a>::<wbr><a href="index.html">fmt</a>::<wbr><a class="struct" href="#">Layer</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_subscriber/fmt/fmt_layer.rs.html#64-77">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct Layer<S, N = <a class="struct" href="format/struct.DefaultFields.html" title="struct tracing_subscriber::fmt::format::DefaultFields">DefaultFields</a>, E = <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><<a class="struct" href="format/struct.Full.html" title="struct tracing_subscriber::fmt::format::Full">Full</a>>, W = <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.fn.html">fn</a>() -> <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/io/stdio/struct.Stdout.html" title="struct std::io::stdio::Stdout">Stdout</a>> { <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>A <a href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer"><code>Layer</code></a> that logs formatted representations of <code>tracing</code> events.</p>
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<h3 id="examples"><a href="#examples">Examples</a></h3>
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<p>Constructing a layer with the default configuration:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::{fmt, Registry};
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<span class="kw">use </span>tracing_subscriber::prelude::<span class="kw-2">*</span>;
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<span class="kw">let </span>subscriber = Registry::default()
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.with(fmt::Layer::default());
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tracing::subscriber::set_global_default(subscriber).unwrap();</code></pre></div>
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<p>Overriding the layer’s behavior:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::{fmt, Registry};
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<span class="kw">use </span>tracing_subscriber::prelude::<span class="kw-2">*</span>;
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<span class="kw">let </span>fmt_layer = fmt::layer()
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.with_target(<span class="bool-val">false</span>) <span class="comment">// don't include event targets when logging
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</span>.with_level(<span class="bool-val">false</span>); <span class="comment">// don't include event levels when logging
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</span><span class="kw">let </span>subscriber = Registry::default().with(fmt_layer);</code></pre></div>
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<p>Setting a custom event formatter:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::fmt::{<span class="self">self</span>, format, time};
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<span class="kw">use </span>tracing_subscriber::prelude::<span class="kw-2">*</span>;
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<span class="kw">let </span>fmt = format().with_timer(time::Uptime::default());
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<span class="kw">let </span>fmt_layer = fmt::layer()
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.event_format(fmt)
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.with_target(<span class="bool-val">false</span>);</code></pre></div>
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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-Layer%3CS%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#79-84">source</a><a href="#impl-Layer%3CS%3E" class="anchor">§</a><h3 class="code-header">impl<S> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#81-83">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -> Self</h4></section></summary><div class="docblock"><p>Returns a new <a href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer"><code>Layer</code></a> with the default configuration.</p>
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</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Layer%3CS,+N,+E,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#87-159">source</a><a href="#impl-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> + for<'a> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>,
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N: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,
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W: for<'writer> <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a><'writer> + 'static,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.event_format" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#115-128">source</a><h4 class="code-header">pub fn <a href="#method.event_format" class="fn">event_format</a><E2>(self, e: E2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E2, W><div class="where">where
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E2: <a class="trait" href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent">FormatEvent</a><S, N> + 'static,</div></h4></section></summary><div class="docblock"><p>Sets the <a href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent">event formatter</a> that the layer being built will
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use to format events.</p>
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<p>The event formatter may be any type implementing the <a href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent"><code>FormatEvent</code></a>
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trait, which is implemented for all functions taking a <a href="struct.FmtContext.html" title="struct tracing_subscriber::fmt::FmtContext"><code>FmtContext</code></a>, a
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<a href="format/struct.Writer.html" title="struct tracing_subscriber::fmt::format::Writer"><code>Writer</code></a>, and an <a href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event"><code>Event</code></a>.</p>
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<h5 id="examples-1"><a href="#examples-1">Examples</a></h5>
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<p>Setting a type implementing <a href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent"><code>FormatEvent</code></a> as the formatter:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::fmt::{<span class="self">self</span>, format};
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<span class="kw">let </span>layer = fmt::layer()
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.event_format(format().compact());</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.map_event_format" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#145-158">source</a><h4 class="code-header">pub fn <a href="#method.map_event_format" class="fn">map_event_format</a><E2>(self, f: impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(E) -> E2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E2, W><div class="where">where
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E2: <a class="trait" href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent">FormatEvent</a><S, N> + 'static,</div></h4></section></summary><div class="docblock"><p>Updates the event formatter by applying a function to the existing event formatter.</p>
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<p>This sets the event formatter that the layer being built will use to record fields.</p>
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<h5 id="examples-2"><a href="#examples-2">Examples</a></h5>
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<p>Updating an event formatter:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>layer = tracing_subscriber::fmt::layer()
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.map_event_format(|e| e.compact());</code></pre></div>
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</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Layer%3CS,+N,+E,+W%3E-1" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#162-373">source</a><a href="#impl-Layer%3CS,+N,+E,+W%3E-1" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_writer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#179-192">source</a><h4 class="code-header">pub fn <a href="#method.with_writer" class="fn">with_writer</a><W2>(self, make_writer: W2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W2><div class="where">where
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W2: for<'writer> <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a><'writer> + 'static,</div></h4></section></summary><div class="docblock"><p>Sets the <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that the layer being built will use to write events.</p>
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<h5 id="examples-3"><a href="#examples-3">Examples</a></h5>
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<p>Using <code>stderr</code> rather than <code>stdout</code>:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::io;
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<span class="kw">use </span>tracing_subscriber::fmt;
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<span class="kw">let </span>layer = fmt::layer()
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.with_writer(io::stderr);</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.writer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#197-199">source</a><h4 class="code-header">pub fn <a href="#method.writer" class="fn">writer</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&W</a></h4></section></summary><div class="docblock"><p>Borrows the <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">writer</a> for this <a href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer"><code>Layer</code></a>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.writer_mut" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#228-230">source</a><h4 class="code-header">pub fn <a href="#method.writer_mut" class="fn">writer_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&mut W</a></h4></section></summary><div class="docblock"><p>Mutably borrows the <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">writer</a> for this <a href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer"><code>Layer</code></a>.</p>
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<p>This method is primarily expected to be used with the
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<a href="../reload/struct.Handle.html#method.modify" title="method tracing_subscriber::reload::Handle::modify"><code>reload::Handle::modify</code></a> method.</p>
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<h5 id="examples-4"><a href="#examples-4">Examples</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>layer = fmt::layer().with_writer(non_blocking(std::io::stderr()));
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<span class="kw">let </span>(layer, reload_handle) = reload::Layer::new(layer);
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<span class="macro">info!</span>(<span class="string">"This will be logged to stderr"</span>);
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reload_handle.modify(|layer| <span class="kw-2">*</span>layer.writer_mut() = non_blocking(std::io::stdout()));
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<span class="macro">info!</span>(<span class="string">"This will be logged to stdout"</span>);</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.set_ansi" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#240-242">source</a><h4 class="code-header">pub fn <a href="#method.set_ansi" class="fn">set_ansi</a>(&mut self, ansi: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>)</h4></section></summary><div class="docblock"><p>Sets whether this layer should use ANSI terminal formatting
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escape codes (such as colors).</p>
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<p>This method is primarily expected to be used with the
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<a href="../reload/struct.Handle.html#method.modify" title="method tracing_subscriber::reload::Handle::modify"><code>reload::Handle::modify</code></a> method when changing
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the writer.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.with_test_writer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#266-276">source</a><h4 class="code-header">pub fn <a href="#method.with_test_writer" class="fn">with_test_writer</a>(self) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, <a class="struct" href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter">TestWriter</a>></h4></section></summary><div class="docblock"><p>Configures the layer to support <a href="https://doc.rust-lang.org/book/ch11-02-running-tests.html#showing-function-output"><code>libtest</code>’s output capturing</a> when used in
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unit tests.</p>
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<p>See <a href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter"><code>TestWriter</code></a> for additional details.</p>
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<h5 id="examples-5"><a href="#examples-5">Examples</a></h5>
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<p>Using <a href="struct.TestWriter.html" title="struct tracing_subscriber::fmt::TestWriter"><code>TestWriter</code></a> to let <code>cargo test</code> capture test output:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::io;
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<span class="kw">use </span>tracing_subscriber::fmt;
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<span class="kw">let </span>layer = fmt::layer()
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.with_test_writer();</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.with_ansi" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#305-320">source</a><h4 class="code-header">pub fn <a href="#method.with_ansi" class="fn">with_ansi</a>(self, ansi: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> Self</h4></section></summary><div class="docblock"><p>Sets whether or not the formatter emits ANSI terminal escape codes
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for colors and other text formatting.</p>
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<p>When the “ansi” crate feature flag is enabled, ANSI colors are enabled
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by default unless the <a href="https://no-color.org/"><code>NO_COLOR</code></a> environment variable is set to
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a non-empty value. If the <a href="https://no-color.org/"><code>NO_COLOR</code></a> environment variable is set to
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any non-empty value, then ANSI colors will be suppressed by default.
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|
|
The <a href="Subscriber::with_ansi"><code>with_ansi</code></a> and <a href="Subscriber::set_ansi"><code>set_ansi</code></a> methods can be used to forcibly
|
|||
|
|
enable ANSI colors, overriding any <a href="https://no-color.org/"><code>NO_COLOR</code></a> environment variable.</p>
|
|||
|
|
<p>Enabling ANSI escapes (calling <code>with_ansi(true)</code>) requires the “ansi”
|
|||
|
|
crate feature flag. Calling <code>with_ansi(true)</code> without the “ansi”
|
|||
|
|
feature flag enabled will panic if debug assertions are enabled, or
|
|||
|
|
print a warning otherwise.</p>
|
|||
|
|
<p>This method itself is still available without the feature flag. This
|
|||
|
|
is to allow ANSI escape codes to be explicitly <em>disabled</em> without
|
|||
|
|
having to opt-in to the dependencies required to emit ANSI formatting.
|
|||
|
|
This way, code which constructs a formatter that should never emit
|
|||
|
|
ANSI escape codes can ensure that they are not used, regardless of
|
|||
|
|
whether or not other crates in the dependency graph enable the “ansi”
|
|||
|
|
feature flag.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.log_internal_errors" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#333-338">source</a><h4 class="code-header">pub fn <a href="#method.log_internal_errors" class="fn">log_internal_errors</a>(self, log_internal_errors: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> Self</h4></section></summary><div class="docblock"><p>Sets whether to write errors from <a href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent"><code>FormatEvent</code></a> to the writer.
|
|||
|
|
Defaults to true.</p>
|
|||
|
|
<p>By default, <code>fmt::Layer</code> will write any <code>FormatEvent</code>-internal errors to
|
|||
|
|
the writer. These errors are unlikely and will only occur if there is a
|
|||
|
|
bug in the <code>FormatEvent</code> implementation or its dependencies.</p>
|
|||
|
|
<p>If writing to the writer fails, the error message is printed to stderr
|
|||
|
|
as a fallback.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.map_writer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#359-372">source</a><h4 class="code-header">pub fn <a href="#method.map_writer" class="fn">map_writer</a><W2>(self, f: impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(W) -> W2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W2><div class="where">where
|
|||
|
|
W2: for<'writer> <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a><'writer> + 'static,</div></h4></section></summary><div class="docblock"><p>Updates the <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> by applying a function to the existing <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a>.</p>
|
|||
|
|
<p>This sets the <a href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter"><code>MakeWriter</code></a> that the layer being built will use to write events.</p>
|
|||
|
|
<h5 id="examples-6"><a href="#examples-6">Examples</a></h5>
|
|||
|
|
<p>Redirect output to stderr if level is <= WARN:</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing::Level;
|
|||
|
|
<span class="kw">use </span>tracing_subscriber::fmt::{<span class="self">self</span>, writer::MakeWriterExt};
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>stderr = std::io::stderr.with_max_level(Level::WARN);
|
|||
|
|
<span class="kw">let </span>layer = fmt::layer()
|
|||
|
|
.map_writer(<span class="kw">move </span>|w| stderr.or_else(w));</code></pre></div>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Layer%3CS,+N,+Format%3CL,+T%3E,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#375-592">source</a><a href="#impl-Layer%3CS,+N,+Format%3CL,+T%3E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, L, T, W> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W><div class="where">where
|
|||
|
|
N: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_timer" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#393-403">source</a><h4 class="code-header">pub fn <a href="#method.with_timer" class="fn">with_timer</a><T2>(self, timer: T2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T2>, W></h4></section></summary><div class="docblock"><p>Use the given <a href="time/trait.FormatTime.html" title="trait tracing_subscriber::fmt::time::FormatTime"><code>timer</code></a> for span and event timestamps.</p>
|
|||
|
|
<p>See the <a href="time/index.html" title="mod tracing_subscriber::fmt::time"><code>time</code> module</a> for the provided timer implementations.</p>
|
|||
|
|
<p>Note that using the <code>"time</code>“” feature flag enables the
|
|||
|
|
additional time formatters <a href="super::time::UtcTime"><code>UtcTime</code></a> and <a href="super::time::LocalTime"><code>LocalTime</code></a>, which use the
|
|||
|
|
<a href="https://docs.rs/time/0.3"><code>time</code> crate</a> to provide more sophisticated timestamp formatting
|
|||
|
|
options.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.without_time" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#406-416">source</a><h4 class="code-header">pub fn <a href="#method.without_time" class="fn">without_time</a>(self) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.unit.html">()</a>>, W></h4></section></summary><div class="docblock"><p>Do not emit timestamps with spans and event.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_span_events" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#459-464">source</a><h4 class="code-header">pub fn <a href="#method.with_span_events" class="fn">with_span_events</a>(self, kind: <a class="struct" href="format/struct.FmtSpan.html" title="struct tracing_subscriber::fmt::format::FmtSpan">FmtSpan</a>) -> Self</h4></section></summary><div class="docblock"><p>Configures how synthesized events are emitted at points in the <a href="https://docs.rs/tracing/latest/tracing/span/index.html#the-span-lifecycle">span
|
|||
|
|
lifecycle</a>.</p>
|
|||
|
|
<p>The following options are available:</p>
|
|||
|
|
<ul>
|
|||
|
|
<li><code>FmtSpan::NONE</code>: No events will be synthesized when spans are
|
|||
|
|
created, entered, exited, or closed. Data from spans will still be
|
|||
|
|
included as the context for formatted events. This is the default.</li>
|
|||
|
|
<li><code>FmtSpan::NEW</code>: An event will be synthesized when spans are created.</li>
|
|||
|
|
<li><code>FmtSpan::ENTER</code>: An event will be synthesized when spans are entered.</li>
|
|||
|
|
<li><code>FmtSpan::EXIT</code>: An event will be synthesized when spans are exited.</li>
|
|||
|
|
<li><code>FmtSpan::CLOSE</code>: An event will be synthesized when a span closes. If
|
|||
|
|
<a href="struct.Layer.html#method.without_time" title="method tracing_subscriber::fmt::Layer::without_time">timestamps are enabled</a> for this formatter, the generated
|
|||
|
|
event will contain fields with the span’s <em>busy time</em> (the total
|
|||
|
|
time for which it was entered) and <em>idle time</em> (the total time that
|
|||
|
|
the span existed but was not entered).</li>
|
|||
|
|
<li><code>FmtSpan::ACTIVE</code>: Events will be synthesized when spans are entered
|
|||
|
|
or exited.</li>
|
|||
|
|
<li><code>FmtSpan::FULL</code>: Events will be synthesized whenever a span is
|
|||
|
|
created, entered, exited, or closed. If timestamps are enabled, the
|
|||
|
|
close event will contain the span’s busy and idle time, as
|
|||
|
|
described above.</li>
|
|||
|
|
</ul>
|
|||
|
|
<p>The options can be enabled in any combination. For instance, the following
|
|||
|
|
will synthesize events whenever spans are created and closed:</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::fmt;
|
|||
|
|
<span class="kw">use </span>tracing_subscriber::fmt::format::FmtSpan;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>subscriber = fmt()
|
|||
|
|
.with_span_events(FmtSpan::NEW | FmtSpan::CLOSE)
|
|||
|
|
.finish();</code></pre></div>
|
|||
|
|
<p>Note that the generated events will only be part of the log output by
|
|||
|
|
this formatter; they will not be recorded by other <code>Subscriber</code>s or by
|
|||
|
|
<code>Layer</code>s added to this subscriber.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_target" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#467-472">source</a><h4 class="code-header">pub fn <a href="#method.with_target" class="fn">with_target</a>(self, display_target: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W></h4></section></summary><div class="docblock"><p>Sets whether or not an event’s target is displayed.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_file" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#477-482">source</a><h4 class="code-header">pub fn <a href="#method.with_file" class="fn">with_file</a>(self, display_filename: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W></h4></section></summary><div class="docblock"><p>Sets whether or not an event’s <a href="../../tracing_core/metadata/struct.Metadata.html#method.file" title="method tracing_core::metadata::Metadata::file">source code file path</a> is
|
|||
|
|
displayed.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_line_number" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#488-496">source</a><h4 class="code-header">pub fn <a href="#method.with_line_number" class="fn">with_line_number</a>(
|
|||
|
|
self,
|
|||
|
|
display_line_number: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>
|
|||
|
|
) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W></h4></section></summary><div class="docblock"><p>Sets whether or not an event’s <a href="../../tracing_core/metadata/struct.Metadata.html#method.line" title="method tracing_core::metadata::Metadata::line">source code line number</a> is
|
|||
|
|
displayed.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_level" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#499-504">source</a><h4 class="code-header">pub fn <a href="#method.with_level" class="fn">with_level</a>(self, display_level: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W></h4></section></summary><div class="docblock"><p>Sets whether or not an event’s level is displayed.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_thread_ids" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#510-515">source</a><h4 class="code-header">pub fn <a href="#method.with_thread_ids" class="fn">with_thread_ids</a>(
|
|||
|
|
self,
|
|||
|
|
display_thread_ids: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>
|
|||
|
|
) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W></h4></section></summary><div class="docblock"><p>Sets whether or not the <a href="https://doc.rust-lang.org/1.76.0/std/thread/struct.ThreadId.html" title="struct std::thread::ThreadId">thread ID</a> of the current thread is displayed
|
|||
|
|
when formatting events.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_thread_names" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#521-529">source</a><h4 class="code-header">pub fn <a href="#method.with_thread_names" class="fn">with_thread_names</a>(
|
|||
|
|
self,
|
|||
|
|
display_thread_names: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>
|
|||
|
|
) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><L, T>, W></h4></section></summary><div class="docblock"><p>Sets whether or not the <a href="https://doc.rust-lang.org/1.76.0/std/thread/index.html#naming-threads" title="mod std::thread">name</a> of the current thread is displayed
|
|||
|
|
when formatting events.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.compact" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#532-545">source</a><h4 class="code-header">pub fn <a href="#method.compact" class="fn">compact</a>(self) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><<a class="struct" href="format/struct.Compact.html" title="struct tracing_subscriber::fmt::format::Compact">Compact</a>, T>, W><div class="where">where
|
|||
|
|
N: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h4></section></summary><div class="docblock"><p>Sets the layer being built to use a <a href="format/struct.Compact.html" title="struct tracing_subscriber::fmt::format::Compact">less verbose formatter</a>.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.pretty" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#550-560">source</a><h4 class="code-header">pub fn <a href="#method.pretty" class="fn">pretty</a>(self) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, <a class="struct" href="format/struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty">Pretty</a>, <a class="struct" href="format/struct.Format.html" title="struct tracing_subscriber::fmt::format::Format">Format</a><<a class="struct" href="format/struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty">Pretty</a>, T>, W></h4></section></summary><div class="docblock"><p>Sets the layer being built to use an <a href="format/struct.Pretty.html" title="struct tracing_subscriber::fmt::format::Pretty">excessively pretty, human-readable formatter</a>.</p>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Layer%3CS,+N,+E,+W%3E-2" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#642-690">source</a><a href="#impl-Layer%3CS,+N,+E,+W%3E-2" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt_fields" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#645-658">source</a><h4 class="code-header">pub fn <a href="#method.fmt_fields" class="fn">fmt_fields</a><N2>(self, fmt_fields: N2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N2, E, W><div class="where">where
|
|||
|
|
N2: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h4></section></summary><div class="docblock"><p>Sets the field formatter that the layer being built will use to record
|
|||
|
|
fields.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.map_fmt_fields" class="method"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#676-689">source</a><h4 class="code-header">pub fn <a href="#method.map_fmt_fields" class="fn">map_fmt_fields</a><N2>(self, f: impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(N) -> N2) -> <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N2, E, W><div class="where">where
|
|||
|
|
N2: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,</div></h4></section></summary><div class="docblock"><p>Updates the field formatter by applying a function to the existing field formatter.</p>
|
|||
|
|
<p>This sets the field formatter that the layer being built will use to record fields.</p>
|
|||
|
|
<h5 id="examples-7"><a href="#examples-7">Examples</a></h5>
|
|||
|
|
<p>Updating a field formatter:</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tracing_subscriber::field::MakeExt;
|
|||
|
|
<span class="kw">let </span>layer = tracing_subscriber::fmt::layer()
|
|||
|
|
.map_fmt_fields(|f| f.debug_alt());</code></pre></div>
|
|||
|
|
</div></details></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-Layer%3CS,+N,+E,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#63">source</a><a href="#impl-Debug-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, E: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, W: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W></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_subscriber/fmt/fmt_layer.rs.html#63">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-Layer%3CS%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#692-708">source</a><a href="#impl-Default-for-Layer%3CS%3E" class="anchor">§</a><h3 class="code-header">impl<S> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#693-707">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -> Self</h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.76.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Layer%3CS%3E-for-Layer%3CS,+N,+E,+W%3E" class="impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#804-1008">source</a><a href="#impl-Layer%3CS%3E-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="trait" href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer">Layer</a><S> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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S: <a class="trait" href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber">Subscriber</a> + for<'a> <a class="trait" href="../registry/trait.LookupSpan.html" title="trait tracing_subscriber::registry::LookupSpan">LookupSpan</a><'a>,
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N: for<'writer> <a class="trait" href="trait.FormatFields.html" title="trait tracing_subscriber::fmt::FormatFields">FormatFields</a><'writer> + 'static,
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E: <a class="trait" href="trait.FormatEvent.html" title="trait tracing_subscriber::fmt::FormatEvent">FormatEvent</a><S, N> + 'static,
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W: for<'writer> <a class="trait" href="trait.MakeWriter.html" title="trait tracing_subscriber::fmt::MakeWriter">MakeWriter</a><'writer> + 'static,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.on_new_span" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#811-846">source</a><a href="#method.on_new_span" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_new_span" class="fn">on_new_span</a>(&self, attrs: &<a class="struct" href="../../tracing_core/span/struct.Attributes.html" title="struct tracing_core::span::Attributes">Attributes</a><'_>, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that a new span was constructed with the given
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<code>Attributes</code> and <code>Id</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_record" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#848-865">source</a><a href="#method.on_record" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_record" class="fn">on_record</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, values: &<a class="struct" href="../../tracing_core/span/struct.Record.html" title="struct tracing_core::span::Record">Record</a><'_>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that a span with the given <code>Id</code> recorded the given
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<code>values</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_enter" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#867-885">source</a><a href="#method.on_enter" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_enter" class="fn">on_enter</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that a span with the given ID was entered.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_exit" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#887-905">source</a><a href="#method.on_exit" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_exit" class="fn">on_exit</a>(&self, id: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that the span with the given ID was exited.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_close" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#907-942">source</a><a href="#method.on_close" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_close" class="fn">on_close</a>(&self, id: <a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that the span with the given ID has been closed.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_event" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/fmt/fmt_layer.rs.html#944-993">source</a><a href="#method.on_event" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_event" class="fn">on_event</a>(&self, event: &<a class="struct" href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event">Event</a><'_>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that an event has occurred.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_register_dispatch" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#753-755">source</a><a href="#method.on_register_dispatch" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_register_dispatch" class="fn">on_register_dispatch</a>(&self, subscriber: &<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>)</h4></section></summary><div class='docblock'>Performs late initialization when installing this layer as a
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<a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>. <a href="../layer/trait.Layer.html#method.on_register_dispatch">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.on_layer" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#784-786">source</a><a href="#method.on_layer" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_layer" class="fn">on_layer</a>(&mut self, subscriber: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&mut S</a>)</h4></section></summary><div class='docblock'>Performs late initialization when attaching a <code>Layer</code> to a
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<a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>. <a href="../layer/trait.Layer.html#method.on_layer">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.register_callsite" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#828-834">source</a><a href="#method.register_callsite" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.register_callsite" class="fn">register_callsite</a>(&self, metadata: &'static <a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a><'static>) -> <a class="struct" href="../../tracing_core/subscriber/struct.Interest.html" title="struct tracing_core::subscriber::Interest">Interest</a></h4></section></summary><div class='docblock'>Registers a new callsite with this layer, returning whether or not
|
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the layer is interested in being notified about the callsite, similarly
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to <a href="../../tracing_core/subscriber/trait.Subscriber.html#method.register_callsite" title="method tracing_core::subscriber::Subscriber::register_callsite"><code>Subscriber::register_callsite</code></a>. <a href="../layer/trait.Layer.html#method.register_callsite">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.enabled" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#868-871">source</a><a href="#method.enabled" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.enabled" class="fn">enabled</a>(&self, metadata: &<a class="struct" href="../../tracing_core/metadata/struct.Metadata.html" title="struct tracing_core::metadata::Metadata">Metadata</a><'_>, ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Returns <code>true</code> if this layer is interested in a span or event with the
|
|||
|
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given <code>metadata</code> in the current <a href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context"><code>Context</code></a>, similarly to
|
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<a href="../../tracing_core/subscriber/trait.Subscriber.html#tymethod.enabled" title="method tracing_core::subscriber::Subscriber::enabled"><code>Subscriber::enabled</code></a>. <a href="../layer/trait.Layer.html#method.enabled">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.on_follows_from" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#899">source</a><a href="#method.on_follows_from" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_follows_from" class="fn">on_follows_from</a>(&self, _span: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, _follows: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, _ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that a span with the ID <code>span</code> recorded that it
|
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follows from the span with the ID <code>follows</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.event_enabled" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#922-924">source</a><a href="#method.event_enabled" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.event_enabled" class="fn">event_enabled</a>(&self, _event: &<a class="struct" href="../../tracing_core/event/struct.Event.html" title="struct tracing_core::event::Event">Event</a><'_>, _ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Called before <a href="../layer/trait.Layer.html#method.on_event"><code>on_event</code></a>, to determine if <code>on_event</code> should be called.</div></details><details class="toggle method-toggle" open><summary><section id="method.on_id_change" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#940">source</a><a href="#method.on_id_change" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.on_id_change" class="fn">on_id_change</a>(&self, _old: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, _new: &<a class="struct" href="../../tracing_core/span/struct.Id.html" title="struct tracing_core::span::Id">Id</a>, _ctx: <a class="struct" href="../layer/struct.Context.html" title="struct tracing_subscriber::layer::Context">Context</a><'_, S>)</h4></section></summary><div class='docblock'>Notifies this layer that a span ID has been cloned, and that the
|
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subscriber returned a different ID.</div></details><details class="toggle method-toggle" open><summary><section id="method.and_then" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#1039-1046">source</a><a href="#method.and_then" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.and_then" class="fn">and_then</a><L>(self, layer: L) -> <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a><L, Self, S><div class="where">where
|
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L: <a class="trait" href="../layer/trait.Layer.html" title="trait tracing_subscriber::layer::Layer">Layer</a><S>,
|
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Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Composes this layer around the given <code>Layer</code>, returning a <code>Layered</code>
|
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struct implementing <code>Layer</code>. <a href="../layer/trait.Layer.html#method.and_then">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#1091-1098">source</a><a href="#method.with_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.with_subscriber" class="fn">with_subscriber</a>(self, inner: S) -> <a class="struct" href="../layer/struct.Layered.html" title="struct tracing_subscriber::layer::Layered">Layered</a><Self, S><div class="where">where
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Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Composes this <code>Layer</code> with the given <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>, returning a
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<code>Layered</code> struct that implements <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a>. <a href="../layer/trait.Layer.html#method.with_subscriber">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_filter" class="method trait-impl"><a class="src rightside" href="../../src/tracing_subscriber/layer/mod.rs.html#1110-1116">source</a><a href="#method.with_filter" class="anchor">§</a><h4 class="code-header">fn <a href="../layer/trait.Layer.html#method.with_filter" class="fn">with_filter</a><F>(self, filter: F) -> <a class="struct" href="../filter/struct.Filtered.html" title="struct tracing_subscriber::filter::Filtered">Filtered</a><Self, F, S><div class="where">where
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Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
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F: <a class="trait" href="../layer/trait.Filter.html" title="trait tracing_subscriber::layer::Filter">Filter</a><S>,</div></h4></section></summary><div class='docblock'>Combines <code>self</code> with a <a href="../layer/trait.Filter.html" title="trait tracing_subscriber::layer::Filter"><code>Filter</code></a>, returning a <a href="../filter/struct.Filtered.html" title="struct tracing_subscriber::filter::Filtered"><code>Filtered</code></a> layer. <a href="../layer/trait.Layer.html#method.with_filter">Read more</a></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-RefUnwindSafe-for-Layer%3CS,+N,+E,+W%3E" class="impl"><a href="#impl-RefUnwindSafe-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
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N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
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W: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-Layer%3CS,+N,+E,+W%3E" class="impl"><a href="#impl-Send-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
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N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
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W: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-Layer%3CS,+N,+E,+W%3E" class="impl"><a href="#impl-Sync-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
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N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
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W: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-Layer%3CS,+N,+E,+W%3E" class="impl"><a href="#impl-Unpin-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
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N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
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W: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-Layer%3CS,+N,+E,+W%3E" class="impl"><a href="#impl-UnwindSafe-for-Layer%3CS,+N,+E,+W%3E" class="anchor">§</a><h3 class="code-header">impl<S, N, E, W> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Layer.html" title="struct tracing_subscriber::fmt::Layer">Layer</a><S, N, E, W><div class="where">where
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E: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
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N: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
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W: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,</div></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/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#763">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/1.76.0/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" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#766">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/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="../../tracing/instrument/trait.Instrument.html" title="trait tracing::instrument::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">source</a><a href="#method.instrument" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.Instrument.html#method.instrument" class="fn">instrument</a>(self, span: <a class="struct" href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span">Span</a>) -> <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a><Self></h4></section></summary><div class='docblock'>Instruments this type with the provided <a href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
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<code>Instrumented</code> wrapper. <a href="../../tracing/instrument/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">source</a><a href="#method.in_current_span" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.Instrument.html#method.in_current_span" class="fn">in_current_span</a>(self) -> <a class="struct" href="../../tracing/instrument/struct.Instrumented.html" title="struct tracing::instrument::Instrumented">Instrumented</a><Self></h4></section></summary><div class='docblock'>Instruments this type with the <a href="../../tracing/span/struct.Span.html#method.current" title="associated function tracing::span::Span::current">current</a> <a href="../../tracing/span/struct.Span.html" title="struct tracing::span::Span"><code>Span</code></a>, returning an
|
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<code>Instrumented</code> wrapper. <a href="../../tracing/instrument/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/1.76.0/src/core/convert/mod.rs.html#747-749">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/1.76.0/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/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#756">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#803-805">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/1.76.0/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/1.76.0/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" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#810">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#788-790">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/1.76.0/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/1.76.0/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-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/1.76.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#795">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/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="../../tracing/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#176-178">source</a><a href="#method.with_subscriber-1" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_subscriber" class="fn">with_subscriber</a><S>(self, subscriber: S) -> <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self><div class="where">where
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S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="struct" href="../../tracing_core/dispatcher/struct.Dispatch.html" title="struct tracing_core::dispatcher::Dispatch">Dispatch</a>>,</div></h4></section></summary><div class='docblock'>Attaches the provided <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
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<a href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../tracing/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">source</a><a href="#method.with_current_subscriber" class="anchor">§</a><h4 class="code-header">fn <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber" class="fn">with_current_subscriber</a>(self) -> <a class="struct" href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch">WithDispatch</a><Self></h4></section></summary><div class='docblock'>Attaches the current <a href="../../tracing/dispatcher/index.html#setting-the-default-subscriber" title="mod tracing::dispatcher">default</a> <a href="../../tracing_core/subscriber/trait.Subscriber.html" title="trait tracing_core::subscriber::Subscriber"><code>Subscriber</code></a> to this type, returning a
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<a href="../../tracing/instrument/struct.WithDispatch.html" title="struct tracing::instrument::WithDispatch"><code>WithDispatch</code></a> wrapper. <a href="../../tracing/instrument/trait.WithSubscriber.html#method.with_current_subscriber">Read more</a></div></details></div></details></div></section></div></main></body></html>
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