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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 thread-safe cell that can be written to only once."><meta name="keywords" content="rust, rustlang, rust-lang, OnceCell"><title>OnceCell in tokio::sync - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</a><h2 class="location">Struct OnceCell</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#implementations">Methods</a></h3><div class="sidebar-links"><a href="#method.get">get</a><a href="#method.get_mut">get_mut</a><a href="#method.get_or_init">get_or_init</a><a href="#method.get_or_try_init">get_or_try_init</a><a href="#method.initialized">initialized</a><a href="#method.into_inner">into_inner</a><a href="#method.new">new</a><a href="#method.new_with">new_with</a><a href="#method.set">set</a><a href="#method.take">take</a></div><h3 class="sidebar-title"><a href="#trait-implementations">Trait Implementations</a></h3><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a><a href="#impl-Drop">Drop</a><a href="#impl-Eq">Eq</a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-PartialEq%3COnceCell%3CT%3E%3E">PartialEq<OnceCell<T>></a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div><h3 class="sidebar-title"><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">UnwindSafe</a></div><h3 class="sidebar-title"><a href="#blanket-implementations">Blanket Implementations</a></h3><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%3C!%3E">From<!></a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Into%3CU%3E">Into<U></a><a href="#impl-ToOwned">ToOwned</a><a href="#impl-TryFrom%3CU%3E">TryFrom<U></a><a href="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><h2 class="location">Other items in<br><a href="../index.html">tokio</a>::<wbr><a href="index.html">sync</a></h2><div id="sidebar-vars" data-name="OnceCell" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../tokio/index.html"><img class="rust-logo" src="../../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><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" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Struct <a href="../index.html">tokio</a>::<wbr><a href="index.html">sync</a>::<wbr><a class="struct" href="#">OnceCell</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><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="../../src/tokio/sync/once_cell.rs.html#70-74" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust struct"><code>pub struct OnceCell<T> { /* fields omitted */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A thread-safe cell that can be written to only once.</p>
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<p>A <code>OnceCell</code> is typically used for global variables that need to be
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initialized once on first use, but need no further changes. The <code>OnceCell</code>
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in Tokio allows the initialization procedure to be asynchronous.</p>
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<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">tokio::sync::OnceCell</span>;
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">some_computation</span>() -> <span class="ident">u32</span> {
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<span class="number">1</span> <span class="op">+</span> <span class="number">1</span>
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}
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<span class="kw">static</span> <span class="ident">ONCE</span>: <span class="ident">OnceCell</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="ident">OnceCell::const_new</span>();
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<span class="attribute">#[<span class="ident">tokio::main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">ONCE</span>.<span class="ident">get_or_init</span>(<span class="ident">some_computation</span>).<span class="kw">await</span>;
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<span class="macro">assert_eq!</span>(<span class="kw-2">*</span><span class="ident">result</span>, <span class="number">2</span>);
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}</code></pre></div>
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<p>It is often useful to write a wrapper method for accessing the value.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">tokio::sync::OnceCell</span>;
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<span class="kw">static</span> <span class="ident">ONCE</span>: <span class="ident">OnceCell</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="ident">OnceCell::const_new</span>();
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">get_global_integer</span>() -> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">u32</span> {
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<span class="ident">ONCE</span>.<span class="ident">get_or_init</span>(<span class="op">|</span><span class="op">|</span> <span class="kw">async</span> {
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<span class="number">1</span> <span class="op">+</span> <span class="number">1</span>
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}).<span class="kw">await</span>
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}
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<span class="attribute">#[<span class="ident">tokio::main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">get_global_integer</span>().<span class="kw">await</span>;
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<span class="macro">assert_eq!</span>(<span class="kw-2">*</span><span class="ident">result</span>, <span class="number">2</span>);
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}</code></pre></div>
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</div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#127-402" title="goto source code">[src]</a></div><a href="#impl" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.new" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#129-135" title="goto source code">[src]</a></div><a href="#method.new" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.new" class="fnname">new</a>() -> Self</h4></div></summary><div class="docblock"><p>Creates a new empty <code>OnceCell</code> instance.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.new_with" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#142-148" title="goto source code">[src]</a></div><a href="#method.new_with" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.new_with" class="fnname">new_with</a>(value: <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T>) -> Self</h4></div></summary><div class="docblock"><p>Creates a new <code>OnceCell</code> that contains the provided value, if any.</p>
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<p>If the <code>Option</code> is <code>None</code>, this is equivalent to <code>OnceCell::new</code>.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.initialized" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#186-190" title="goto source code">[src]</a></div><a href="#method.initialized" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.initialized" class="fnname">initialized</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.bool.html">bool</a></h4></div></summary><div class="docblock"><p>Returns <code>true</code> if the <code>OnceCell</code> currently contains a value, and <code>false</code>
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otherwise.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.get" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#226-232" title="goto source code">[src]</a></div><a href="#method.get" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.get" class="fnname">get</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>T></h4></div></summary><div class="docblock"><p>Returns a reference to the value currently stored in the <code>OnceCell</code>, or
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<code>None</code> if the <code>OnceCell</code> is empty.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.get_mut" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#240-246" title="goto source code">[src]</a></div><a href="#method.get_mut" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.get_mut" class="fnname">get_mut</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&mut </a>T></h4></div></summary><div class="docblock"><p>Returns a mutable reference to the value currently stored in the
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<code>OnceCell</code>, or <code>None</code> if the <code>OnceCell</code> is empty.</p>
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<p>Since this call borrows the <code>OnceCell</code> mutably, it is safe to mutate the
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value inside the <code>OnceCell</code> — the mutable borrow statically guarantees
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no other references exist.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.set" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#259-284" title="goto source code">[src]</a></div><a href="#method.set" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.set" class="fnname">set</a>(&self, value: T) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.unit.html">()</a>, <a class="enum" href="enum.SetError.html" title="enum tokio::sync::SetError">SetError</a><T>></h4></div></summary><div class="docblock"><p>Sets the value of the <code>OnceCell</code> to the given value if the <code>OnceCell</code> is
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empty.</p>
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<p>If the <code>OnceCell</code> already has a value, this call will fail with an
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<a href="enum.SetError.html#variant.AlreadyInitializedError"><code>SetError::AlreadyInitializedError</code></a>.</p>
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<p>If the <code>OnceCell</code> is empty, but some other task is currently trying to
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set the value, this call will fail with <a href="enum.SetError.html#variant.InitializingError"><code>SetError::InitializingError</code></a>.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.get_or_init" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#299-332" title="goto source code">[src]</a></div><a href="#method.get_or_init" class="anchor"></a><h4 class="code-header">pub async fn <a href="#method.get_or_init" class="fnname">get_or_init</a><F, Fut>(&self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>T <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> Fut,<br> Fut: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T>, </span></h4></div></summary><div class="docblock"><p>Gets the value currently in the <code>OnceCell</code>, or initialize it with the
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given asynchronous operation.</p>
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<p>If some other task is currently working on initializing the <code>OnceCell</code>,
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this call will wait for that other task to finish, then return the value
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that the other task produced.</p>
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<p>If the provided operation is cancelled or panics, the initialization
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attempt is cancelled. If there are other tasks waiting for the value to
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be initialized, one of them will start another attempt at initializing
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the value.</p>
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<p>This will deadlock if <code>f</code> tries to initialize the cell recursively.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.get_or_try_init" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#347-383" title="goto source code">[src]</a></div><a href="#method.get_or_try_init" class="anchor"></a><h4 class="code-header">pub async fn <a href="#method.get_or_try_init" class="fnname">get_or_try_init</a><E, F, Fut>(&self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>T, E> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> Fut,<br> Fut: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E>>, </span></h4></div></summary><div class="docblock"><p>Gets the value currently in the <code>OnceCell</code>, or initialize it with the
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given asynchronous operation.</p>
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<p>If some other task is currently working on initializing the <code>OnceCell</code>,
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this call will wait for that other task to finish, then return the value
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that the other task produced.</p>
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<p>If the provided operation returns an error, is cancelled or panics, the
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initialization attempt is cancelled. If there are other tasks waiting
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for the value to be initialized, one of them will start another attempt
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at initializing the value.</p>
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<p>This will deadlock if <code>f</code> tries to initialize the cell recursively.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.into_inner" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#387-395" title="goto source code">[src]</a></div><a href="#method.into_inner" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.into_inner" class="fnname">into_inner</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></div></summary><div class="docblock"><p>Takes the value from the cell, destroying the cell in the process.
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Returns <code>None</code> if the cell is empty.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.take" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#399-401" title="goto source code">[src]</a></div><a href="#method.take" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.take" class="fnname">take</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></div></summary><div class="docblock"><p>Takes ownership of the current value, leaving the cell empty. Returns
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<code>None</code> if the cell is empty.</p>
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</div></details></div></details><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Clone" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#90-94" title="goto source code">[src]</a></div><a href="#impl-Clone" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.clone" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#91-93" title="goto source code">[src]</a></div><a href="#method.clone" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html#tymethod.clone" class="fnname">clone</a>(&self) -> <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h4></div></summary><div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.clone_from" class="method trait-impl has-srclink"><div class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/clone.rs.html#130" title="goto source code">[src]</a></div><a href="#method.clone_from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html#method.clone_from" class="fnname">clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>Self)</h4></div></summary><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Debug" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#82-88" title="goto source code">[src]</a></div><a href="#impl-Debug" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.fmt" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#83-87" title="goto source code">[src]</a></div><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, fmt: &mut <a class="struct" href="https://doc.rust-lang.org/1.59.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.59.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></div></summary><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.59.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Default" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#76-80" title="goto source code">[src]</a></div><a href="#impl-Default" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.default" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#77-79" title="goto source code">[src]</a></div><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/default/trait.Default.html#tymethod.default" class="fnname">default</a>() -> <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h4></div></summary><div class='docblock'><p>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.59.0/core/default/trait.Default.html#tymethod.default">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Drop" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#104-113" title="goto source code">[src]</a></div><a href="#impl-Drop" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.drop" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#105-112" title="goto source code">[src]</a></div><a href="#method.drop" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/ops/drop/trait.Drop.html#tymethod.drop" class="fnname">drop</a>(&mut self)</h4></div></summary><div class='docblock'><p>Executes the destructor for this type. <a href="https://doc.rust-lang.org/1.59.0/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-From%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#115-125" title="goto source code">[src]</a></div><a href="#impl-From%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.from" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#116-124" title="goto source code">[src]</a></div><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(value: T) -> Self</h4></div></summary><div class='docblock'><p>Performs the conversion.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-PartialEq%3COnceCell%3CT%3E%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#96-100" title="goto source code">[src]</a></div><a href="#impl-PartialEq%3COnceCell%3CT%3E%3E" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a><<a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T>> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.eq" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#97-99" title="goto source code">[src]</a></div><a href="#method.eq" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.PartialEq.html#tymethod.eq" class="fnname">eq</a>(&self, other: &<a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T>) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.bool.html">bool</a></h4></div></summary><div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used
|
||
by <code>==</code>. <a href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
||
</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.ne" class="method trait-impl has-srclink"><div class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/cmp.rs.html#219" title="goto source code">[src]</a></div><a href="#method.ne" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.PartialEq.html#method.ne" class="fnname">ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>Rhs) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.bool.html">bool</a></h4></div></summary><div class='docblock'><p>This method tests for <code>!=</code>.</p>
|
||
</div></details></div></details><div id="impl-Eq" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#102" title="goto source code">[src]</a></div><a href="#impl-Eq" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div><div id="impl-Send" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#414" title="goto source code">[src]</a></div><a href="#impl-Send" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div><div id="impl-Sync" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/tokio/sync/once_cell.rs.html#409" title="goto source code">[src]</a></div><a href="#impl-Sync" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></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"><div id="impl-RefUnwindSafe" class="impl has-srclink"><div class="rightside"></div><a href="#impl-RefUnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl<T> !<a class="trait" href="https://doc.rust-lang.org/1.59.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></div><div id="impl-Unpin" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Unpin" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>, </span></h3></div><div id="impl-UnwindSafe" class="impl has-srclink"><div class="rightside"></div><a href="#impl-UnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>, </span></h3></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"><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Any" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/any.rs.html#132-136" title="goto source code">[src]</a></div><a href="#impl-Any" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/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/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.type_id" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/any.rs.html#133" title="goto source code">[src]</a></div><a href="#method.type_id" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.59.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></div></summary><div class='docblock'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.59.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Borrow%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/borrow.rs.html#209-214" title="goto source code">[src]</a></div><a href="#impl-Borrow%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/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/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.borrow" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/borrow.rs.html#211" title="goto source code">[src]</a></div><a href="#method.borrow" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&</a>T</h4></div></summary><div class='docblock'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.59.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-BorrowMut%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/borrow.rs.html#218-222" title="goto source code">[src]</a></div><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/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/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.borrow_mut" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/borrow.rs.html#219" title="goto source code">[src]</a></div><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&mut </a>T</h4></div></summary><div class='docblock'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.59.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-From%3C!%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#566-570" title="goto source code">[src]</a></div><a href="#impl-From%3C!%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.never.html">!</a>> for T</h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.from-1" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#567" title="goto source code">[src]</a></div><a href="#method.from-1" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.never.html">!</a>) -> T</h4></div></summary><div class='docblock'><p>Performs the conversion.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-From%3CT%3E-1" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#550-554" title="goto source code">[src]</a></div><a href="#impl-From%3CT%3E-1" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.from-2" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#551" title="goto source code">[src]</a></div><a href="#method.from-2" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</h4></div></summary><div class='docblock'><p>Performs the conversion.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Into%3CU%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#538-545" title="goto source code">[src]</a></div><a href="#impl-Into%3CU%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.59.0/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/1.59.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.into" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#542" title="goto source code">[src]</a></div><a href="#method.into" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</h4></div></summary><div class='docblock'><p>Performs the conversion.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-ToOwned" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/alloc/borrow.rs.html#84-96" title="goto source code">[src]</a></div><a href="#impl-ToOwned" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.59.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><div id="associatedtype.Owned" class="type trait-impl has-srclink"><a href="#associatedtype.Owned" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.59.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></div></summary><div class='docblock'><p>The resulting type after obtaining ownership.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.to_owned" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/alloc/borrow.rs.html#89" title="goto source code">[src]</a></div><a href="#method.to_owned" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fnname">to_owned</a>(&self) -> T</h4></div></summary><div class='docblock'><p>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.59.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.clone_into" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/alloc/borrow.rs.html#93" title="goto source code">[src]</a></div><a href="#method.clone_into" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fnname">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.59.0/std/primitive.reference.html">&mut </a>T)</h4></div></summary><div class="item-info"><div class="stab unstable"><span class="emoji">🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code>)</div></div><div class='docblock'><p>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.59.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-TryFrom%3CU%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#588-597" title="goto source code">[src]</a></div><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.59.0/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/1.59.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><div id="associatedtype.Error-1" class="type trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></div></summary><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.try_from" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#594" title="goto source code">[src]</a></div><a href="#method.try_from" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></div></summary><div class='docblock'><p>Performs the conversion.</p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-TryInto%3CU%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#574-583" title="goto source code">[src]</a></div><a href="#impl-TryInto%3CU%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.59.0/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/1.59.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><div id="associatedtype.Error" class="type trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></div></summary><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><div id="method.try_into" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.59.0/src/core/convert/mod.rs.html#580" title="goto source code">[src]</a></div><a href="#method.try_into" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.59.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.59.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></div></summary><div class='docblock'><p>Performs the conversion.</p>
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