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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="API documentation for the Rust `Once` struct in crate `tracing_core`."><meta name="keywords" content="rust, rustlang, rust-lang, Once"><title>tracing_core::Once - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../tracing_core/index.html'><div class='logo-container'><img src='https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png' alt='logo'></div></a><p class="location">Struct Once</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#implementations">Methods</a><div class="sidebar-links"><a href="#method.call_once">call_once</a><a href="#method.call_once_force">call_once_force</a><a href="#method.is_completed">is_completed</a><a href="#method.new">new</a></div><a class="sidebar-title" href="#trait-implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">!UnwindSafe</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow<T></a><a href="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Into%3CU%3E">Into<U></a><a href="#impl-TryFrom%3CU%3E">TryFrom<U></a><a href="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><p class="location"><a href="index.html">tracing_core</a></p><div id="sidebar-vars" data-name="Once" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Struct <a href="index.html">tracing_core</a>::<wbr><a class="struct" href="">Once</a></span><span class="out-of-band"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#112-117" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust struct">pub struct Once { /* fields omitted */ }</pre></div><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="../tracing_core/struct.Once.html#method.new" title="Once::new()"><code>Once::new()</code></a>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Once</span>;
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<span class="kw">static</span> <span class="ident">START</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
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<span class="ident">START</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="comment">// run initialization here</span>
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});</pre></div>
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</div><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><h3 id="impl" class="impl"><code class="in-band">impl <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#184-432" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.new" class="method"><code>pub const fn <a href="#method.new" class="fnname">new</a>() -> <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><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="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#189" title="goto source code">[src]</a></h4><div class="docblock"><p>Creates a new <code>Once</code> value.</p>
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</div><h4 id="method.call_once" class="method"><code>pub fn <a href="#method.call_once" class="fnname">call_once</a><F>(&self, f: F) <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(), </span></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#251-253" title="goto source code">[src]</a></h4><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 may 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="../tracing_core/struct.Once.html" title="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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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Once</span>;
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<span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">VAL</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
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<span class="kw">static</span> <span class="ident">INIT</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
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<span class="comment">// Accessing a `static mut` is unsafe much of the time, but if we do so</span>
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<span class="comment">// in a synchronized fashion (e.g., write once or read all) then we're</span>
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<span class="comment">// good to go!</span>
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<span class="comment">//</span>
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<span class="comment">// This function will only call `expensive_computation` once, and will</span>
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<span class="comment">// otherwise always return the value returned from the first invocation.</span>
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<span class="kw">fn</span> <span class="ident">get_cached_val</span>() <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
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<span class="kw">unsafe</span> {
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="ident">VAL</span> <span class="op">=</span> <span class="ident">expensive_computation</span>();
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});
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<span class="ident">VAL</span>
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}
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}
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<span class="kw">fn</span> <span class="ident">expensive_computation</span>() <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
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<span class="comment">// ...</span>
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}</pre></div>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>The closure <code>f</code> will only be executed once 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="../tracing_core/struct.Once.html" title="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><h4 id="method.call_once_force" class="method"><code>pub fn <a href="#method.call_once_force" class="fnname">call_once_force</a><F>(&self, f: F) <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&<a class="struct" href="https://doc.rust-lang.org/nightly/std/sync/once/struct.OnceState.html" title="struct std::sync::once::OnceState">OnceState</a>), </span></code><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#309-311" title="goto source code">[src]</a></h4><div class="docblock"><p>Performs the same function as <a href="../tracing_core/struct.Once.html#method.call_once"><code>call_once()</code></a> except ignores poisoning.</p>
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<p>Unlike <a href="../tracing_core/struct.Once.html#method.call_once"><code>call_once()</code></a>, if this <a href="../tracing_core/struct.Once.html" title="Once"><code>Once</code></a> has been poisoned (i.e., a previous
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call to <a href="../tracing_core/struct.Once.html#method.call_once"><code>call_once()</code></a> or <a href="../tracing_core/struct.Once.html#method.call_once_force"><code>call_once_force()</code></a> caused a panic), calling
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<a href="../tracing_core/struct.Once.html#method.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="../tracing_core/struct.Once.html" title="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="../tracing_core/struct.Once.html" title="Once"><code>Once</code></a> will no
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longer be in a poison state and all future calls to <a href="../tracing_core/struct.Once.html#method.call_once"><code>call_once()</code></a> or
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<a href="../tracing_core/struct.Once.html#method.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/nightly/std/sync/once/struct.OnceState.html" title="OnceState"><code>OnceState</code></a> structure which can be used
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to query the poison status of the <a href="../tracing_core/struct.Once.html" title="Once"><code>Once</code></a>.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Once</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
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<span class="kw">static</span> <span class="ident">INIT</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
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<span class="comment">// poison the once</span>
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<span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">panic</span><span class="macro">!</span>());
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});
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">handle</span>.<span class="ident">join</span>().<span class="ident">is_err</span>());
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<span class="comment">// poisoning propagates</span>
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<span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {});
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});
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">handle</span>.<span class="ident">join</span>().<span class="ident">is_err</span>());
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<span class="comment">// call_once_force will still run and reset the poisoned state</span>
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<span class="ident">INIT</span>.<span class="ident">call_once_force</span>(<span class="op">|</span><span class="ident">state</span><span class="op">|</span> {
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">state</span>.<span class="ident">is_poisoned</span>());
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});
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<span class="comment">// once any success happens, we stop propagating the poison</span>
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {});</pre></div>
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</div><h4 id="method.is_completed" class="method"><code>pub fn <a href="#method.is_completed" class="fnname">is_completed</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><span class="since" title="Stable since Rust version 1.43.0">1.43.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#365" title="goto source code">[src]</a></h4><div class="docblock"><p>Returns <code>true</code> if some <a href="../tracing_core/struct.Once.html#method.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="../tracing_core/struct.Once.html#method.call_once"><code>call_once()</code></a> was not called at all,</li>
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<li><a href="../tracing_core/struct.Once.html#method.call_once"><code>call_once()</code></a> was called, but has not yet completed,</li>
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<li>the <a href="../tracing_core/struct.Once.html" title="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="../tracing_core/struct.Once.html" title="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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<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Once</span>;
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<span class="kw">static</span> <span class="ident">INIT</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">INIT</span>.<span class="ident">is_completed</span>(), <span class="bool-val">false</span>);
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">INIT</span>.<span class="ident">is_completed</span>(), <span class="bool-val">false</span>);
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});
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">INIT</span>.<span class="ident">is_completed</span>(), <span class="bool-val">true</span>);</pre></div>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Once</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
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<span class="kw">static</span> <span class="ident">INIT</span>: <span class="ident">Once</span> <span class="op">=</span> <span class="ident">Once</span>::<span class="ident">new</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">INIT</span>.<span class="ident">is_completed</span>(), <span class="bool-val">false</span>);
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<span class="kw">let</span> <span class="ident">handle</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="ident">INIT</span>.<span class="ident">call_once</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">panic</span><span class="macro">!</span>());
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});
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">handle</span>.<span class="ident">join</span>().<span class="ident">is_err</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">INIT</span>.<span class="ident">is_completed</span>(), <span class="bool-val">false</span>);</pre></div>
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</div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><h3 id="impl-Debug" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl-Debug" class="anchor"></a><span class="since" title="Stable since Rust version 1.16.0">1.16.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#482-486" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.fmt" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#483" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id="impl-Send" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl-Send" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#124" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Sync" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl-Sync" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/std/sync/once.rs.html#122" title="goto source code">[src]</a></h3><div class="impl-items"></div></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><h3 id="impl-RefUnwindSafe" class="impl"><code class="in-band">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl-RefUnwindSafe" class="anchor"></a><a class="srclink" href="../src/tracing_core/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Unpin" class="impl"><code class="in-band">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl-Unpin" class="anchor"></a><a class="srclink" href="../src/tracing_core/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-UnwindSafe" class="impl"><code class="in-band">impl !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a> for <a class="struct" href="../tracing_core/struct.Once.html" title="struct tracing_core::Once">Once</a></code><a href="#impl-UnwindSafe" class="anchor"></a><a class="srclink" href="../src/tracing_core/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><h3 id="impl-Any" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-Any" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#131-135" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.type_id" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#132" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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</div></div><h3 id="impl-Borrow%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-Borrow%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#207-211" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#208" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
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</div></div><h3 id="impl-BorrowMut%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214-218" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow_mut" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#215" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
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</div></div><h3 id="impl-From%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</code><a href="#impl-From%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#545-549" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#546" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-Into%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></code><a href="#impl-Into%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#534-541" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#538" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-TryFrom%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></code><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#582-591" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="type">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#588" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-TryInto%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><a href="#impl-TryInto%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#568-577" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-1" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="type">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#574" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div></div></section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="tracing_core"></div>
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