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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 synchronization primitive which can be used to run a one-time global initialization. Useful for one-time initialization for FFI or related functionality. This type can only be constructed with `Once::new()`."><title>Once in tracing_core - 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-5bc39a1768837dd0.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="tracing_core" data-themes="" data-resource-suffix="" data-rustdoc-version="1.77.1 (7cf61ebde 2024-03-27)" data-channel="1.77.1" data-search-js="search-dd67cee4cfa65049.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-4c98445ec4002617.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-48f368f3872407c8.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-04d5337699b92874.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../tracing_core/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_core/index.html"><img src="https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png" alt="logo"></a><h2><a href="../tracing_core/index.html">tracing_core</a><span class="version">0.1.32</span></h2></div><h2 class="location"><a href="#">Once</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.call_once">call_once</a></li><li><a href="#method.call_once_force">call_once_force</a></li><li><a href="#method.is_completed">is_completed</a></li><li><a href="#method.new">new</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-Once">Debug</a></li><li><a href="#impl-RefUnwindSafe-for-Once">RefUnwindSafe</a></li><li><a href="#impl-UnwindSafe-for-Once">UnwindSafe</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Send-for-Once">Send</a></li><li><a href="#impl-Sync-for-Once">Sync</a></li><li><a href="#impl-Unpin-for-Once">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li></ul></section><h2><a href="index.html">In crate tracing_core</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../tracing_core/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_core</a>::<wbr><a class="struct" href="#">Once</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"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#29">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct Once { <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 synchronization primitive which can be used to run a one-time global
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initialization. Useful for one-time initialization for FFI or related
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functionality. This type can only be constructed with <a href="struct.Once.html#method.new" title="associated function tracing_core::Once::new"><code>Once::new()</code></a>.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Once;
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<span class="kw">static </span>START: Once = Once::new();
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START.call_once(|| {
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<span class="comment">// run initialization here
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</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-Once" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#69">source</a><a href="#impl-Once" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.2.0, const since 1.32.0">1.2.0 (const: 1.32.0)</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#75">source</a></span><h4 class="code-header">pub const fn <a href="#method.new" class="fn">new</a>() -> <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h4></section></summary><div class="docblock"><p>Creates a new <code>Once</code> value.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.call_once" class="method"><a class="src rightside" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#139-141">source</a><h4 class="code-header">pub fn <a href="#method.call_once" class="fn">call_once</a><F>(&self, f: F)<div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(),</div></h4></section></summary><div class="docblock"><p>Performs an initialization routine once and only once. The given closure
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will be executed if this is the first time <code>call_once</code> has been called,
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and otherwise the routine will <em>not</em> be invoked.</p>
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<p>This method will block the calling thread if another initialization
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routine is currently running.</p>
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<p>When this function returns, it is guaranteed that some initialization
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has run and completed (it might not be the closure specified). It is also
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guaranteed that any memory writes performed by the executed closure can
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be reliably observed by other threads at this point (there is a
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happens-before relation between the closure and code executing after the
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return).</p>
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<p>If the given closure recursively invokes <code>call_once</code> on the same <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a>
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instance, the exact behavior is not specified: allowed outcomes are
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a panic or a deadlock.</p>
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<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Once;
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<span class="kw">static </span><span class="kw-2">mut </span>VAL: usize = <span class="number">0</span>;
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<span class="kw">static </span>INIT: Once = Once::new();
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<span class="comment">// Accessing a `static mut` is unsafe much of the time, but if we do so
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// in a synchronized fashion (e.g., write once or read all) then we're
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// good to go!
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//
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// This function will only call `expensive_computation` once, and will
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// otherwise always return the value returned from the first invocation.
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</span><span class="kw">fn </span>get_cached_val() -> usize {
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<span class="kw">unsafe </span>{
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INIT.call_once(|| {
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VAL = expensive_computation();
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});
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VAL
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}
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}
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<span class="kw">fn </span>expensive_computation() -> usize {
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<span class="comment">// ...
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</span>}</code></pre></div>
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<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
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<p>The closure <code>f</code> will only be executed once even if this is called
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concurrently amongst many threads. If that closure panics, however, then
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it will <em>poison</em> this <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a> instance, causing all future invocations of
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<code>call_once</code> to also panic.</p>
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<p>This is similar to <a href="struct.Mutex.html#poisoning">poisoning with mutexes</a>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.call_once_force" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#198-200">source</a></span><h4 class="code-header">pub fn <a href="#method.call_once_force" class="fn">call_once_force</a><F>(&self, f: F)<div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&<a class="struct" href="https://doc.rust-lang.org/1.77.1/std/sync/once/struct.OnceState.html" title="struct std::sync::once::OnceState">OnceState</a>),</div></h4></section></summary><div class="docblock"><p>Performs the same function as <a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a> except ignores poisoning.</p>
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<p>Unlike <a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a>, if this <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a> has been poisoned (i.e., a previous
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call to <a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a> or <a href="struct.Once.html#method.call_once_force" title="method tracing_core::Once::call_once_force"><code>call_once_force()</code></a> caused a panic), calling
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<a href="struct.Once.html#method.call_once_force" title="method tracing_core::Once::call_once_force"><code>call_once_force()</code></a> will still invoke the closure <code>f</code> and will <em>not</em>
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result in an immediate panic. If <code>f</code> panics, the <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a> will remain
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in a poison state. If <code>f</code> does <em>not</em> panic, the <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a> will no
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longer be in a poison state and all future calls to <a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a> or
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<a href="struct.Once.html#method.call_once_force" title="method tracing_core::Once::call_once_force"><code>call_once_force()</code></a> will be no-ops.</p>
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<p>The closure <code>f</code> is yielded a <a href="https://doc.rust-lang.org/1.77.1/std/sync/once/struct.OnceState.html" title="struct std::sync::once::OnceState"><code>OnceState</code></a> structure which can be used
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to query the poison status of the <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a>.</p>
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<h5 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Once;
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<span class="kw">use </span>std::thread;
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<span class="kw">static </span>INIT: Once = Once::new();
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<span class="comment">// poison the once
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</span><span class="kw">let </span>handle = thread::spawn(|| {
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INIT.call_once(|| <span class="macro">panic!</span>());
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});
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<span class="macro">assert!</span>(handle.join().is_err());
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<span class="comment">// poisoning propagates
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</span><span class="kw">let </span>handle = thread::spawn(|| {
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INIT.call_once(|| {});
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});
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<span class="macro">assert!</span>(handle.join().is_err());
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<span class="comment">// call_once_force will still run and reset the poisoned state
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</span>INIT.call_once_force(|state| {
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<span class="macro">assert!</span>(state.is_poisoned());
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});
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<span class="comment">// once any success happens, we stop propagating the poison
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</span>INIT.call_once(|| {});</code></pre></div>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.is_completed" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.43.0">1.43.0</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#254">source</a></span><h4 class="code-header">pub fn <a href="#method.is_completed" class="fn">is_completed</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.77.1/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if some <a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a> call has completed
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successfully. Specifically, <code>is_completed</code> will return false in
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the following situations:</p>
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<ul>
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<li><a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a> was not called at all,</li>
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<li><a href="struct.Once.html#method.call_once" title="method tracing_core::Once::call_once"><code>call_once()</code></a> was called, but has not yet completed,</li>
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<li>the <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a> instance is poisoned</li>
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</ul>
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<p>This function returning <code>false</code> does not mean that <a href="struct.Once.html" title="struct tracing_core::Once"><code>Once</code></a> has not been
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executed. For example, it may have been executed in the time between
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when <code>is_completed</code> starts executing and when it returns, in which case
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the <code>false</code> return value would be stale (but still permissible).</p>
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<h5 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Once;
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<span class="kw">static </span>INIT: Once = Once::new();
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<span class="macro">assert_eq!</span>(INIT.is_completed(), <span class="bool-val">false</span>);
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INIT.call_once(|| {
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<span class="macro">assert_eq!</span>(INIT.is_completed(), <span class="bool-val">false</span>);
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});
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<span class="macro">assert_eq!</span>(INIT.is_completed(), <span class="bool-val">true</span>);</code></pre></div>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Once;
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<span class="kw">use </span>std::thread;
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<span class="kw">static </span>INIT: Once = Once::new();
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<span class="macro">assert_eq!</span>(INIT.is_completed(), <span class="bool-val">false</span>);
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<span class="kw">let </span>handle = thread::spawn(|| {
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INIT.call_once(|| <span class="macro">panic!</span>());
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});
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<span class="macro">assert!</span>(handle.join().is_err());
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<span class="macro">assert_eq!</span>(INIT.is_completed(), <span class="bool-val">false</span>);</code></pre></div>
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</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-Once" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.16.0">1.16.0</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#270">source</a></span><a href="#impl-Debug-for-Once" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#271">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.77.1/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.77.1/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/1.77.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.77.1/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.77.1/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.77.1/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><section id="impl-RefUnwindSafe-for-Once" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.59.0">1.59.0</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#37">source</a></span><a href="#impl-RefUnwindSafe-for-Once" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section><section id="impl-UnwindSafe-for-Once" class="impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.59.0">1.59.0</span> · <a class="src" href="https://doc.rust-lang.org/1.77.1/src/std/sync/once.rs.html#34">source</a></span><a href="#impl-UnwindSafe-for-Once" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section></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-Send-for-Once" class="impl"><a href="#impl-Send-for-Once" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section><section id="impl-Sync-for-Once" class="impl"><a href="#impl-Sync-for-Once" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section><section id="impl-Unpin-for-Once" class="impl"><a href="#impl-Unpin-for-Once" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Once.html" title="struct tracing_core::Once">Once</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#764">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/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#767">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.77.1/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-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/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/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#757">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.77.1/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/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#804-806">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/1.77.1/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/1.77.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#811">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.77.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#789-791">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/1.77.1/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/1.77.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.77.1/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/1.77.1/src/core/convert/mod.rs.html#796">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.77.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.77.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |