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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."><title>OnceCell in tokio::sync - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="tokio" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">OnceCell</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../tokio/index.html">tokio</a><span class="version">1.49.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Once<wbr>Cell</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.const_new" title="const_new">const_new</a></li><li><a href="#method.const_new_with" title="const_new_with">const_new_with</a></li><li><a href="#method.get" title="get">get</a></li><li><a href="#method.get_mut" title="get_mut">get_mut</a></li><li><a href="#method.get_or_init" title="get_or_init">get_or_init</a></li><li><a href="#method.get_or_try_init" title="get_or_try_init">get_or_try_init</a></li><li><a href="#method.initialized" title="initialized">initialized</a></li><li><a href="#method.into_inner" title="into_inner">into_inner</a></li><li><a href="#method.new" title="new">new</a></li><li><a href="#method.new_with" title="new_with">new_with</a></li><li><a href="#method.set" title="set">set</a></li><li><a href="#method.take" title="take">take</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-OnceCell%3CT%3E" title="Clone">Clone</a></li><li><a href="#impl-Debug-for-OnceCell%3CT%3E" title="Debug">Debug</a></li><li><a href="#impl-Default-for-OnceCell%3CT%3E" title="Default">Default</a></li><li><a href="#impl-Drop-for-OnceCell%3CT%3E" title="Drop">Drop</a></li><li><a href="#impl-Eq-for-OnceCell%3CT%3E" title="Eq">Eq</a></li><li><a href="#impl-From%3CT%3E-for-OnceCell%3CT%3E" title="From<T>">From<T></a></li><li><a href="#impl-PartialEq-for-OnceCell%3CT%3E" title="PartialEq">PartialEq</a></li><li><a href="#impl-Send-for-OnceCell%3CT%3E" title="Send">Send</a></li><li><a href="#impl-Sync-for-OnceCell%3CT%3E" title="Sync">Sync</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-OnceCell%3CT%3E" title="!Freeze">!Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-OnceCell%3CT%3E" title="!RefUnwindSafe">!RefUnwindSafe</a></li><li><a href="#impl-UnwindSafe-for-OnceCell%3CT%3E" title="!UnwindSafe">!UnwindSafe</a></li><li><a href="#impl-Unpin-for-OnceCell%3CT%3E" title="Unpin">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T" title="Any">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T" title="Borrow<T>">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T" title="BorrowMut<T>">BorrowMut<T></a></li><li><a href="#impl-CloneToUninit-for-T" title="CloneToUninit">CloneToUninit</a></li><li><a href="#impl-From%3C!%3E-for-T" title="From<!>">From<!></a></li><li><a href="#impl-From%3CT%3E-for-T" title="From<T>">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T" title="Into<U>">Into<U></a></li><li><a href="#impl-ToOwned-for-T" title="ToOwned">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T" title="TryFrom<U>">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T" title="TryInto<U>">TryInto<U></a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In tokio::<wbr>sync</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">tokio</a>::<wbr><a href="index.html">sync</a></div><h1>Struct <span class="struct">Once<wbr>Cell</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/tokio/sync/once_cell.rs.html#70-74">Source</a> </span></div><pre class="rust item-decl"><code>pub struct OnceCell<T> { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A 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"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio::sync::OnceCell;
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<span class="kw">async fn </span>some_computation() -> u32 {
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<span class="number">1 </span>+ <span class="number">1
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</span>}
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<span class="kw">static </span>ONCE: OnceCell<u32> = OnceCell::const_new();
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<span class="kw">let </span>result = ONCE.get_or_init(some_computation).<span class="kw">await</span>;
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<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>result, <span class="number">2</span>);</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>tokio::sync::OnceCell;
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<span class="kw">static </span>ONCE: OnceCell<u32> = OnceCell::const_new();
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<span class="kw">async fn </span>get_global_integer() -> <span class="kw-2">&</span><span class="lifetime">'static </span>u32 {
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ONCE.get_or_init(|| <span class="kw">async </span>{
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<span class="number">1 </span>+ <span class="number">1
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</span>}).<span class="kw">await
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</span>}
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<span class="kw">let </span>result = get_global_integer().<span class="kw">await</span>;
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<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>result, <span class="number">2</span>);</code></pre></div></div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#125-457">Source</a><a href="#impl-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#127-133">Source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -> Self</h4></section></summary><div class="docblock"><p>Creates a new empty <code>OnceCell</code> instance.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.const_new" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#168-174">Source</a><h4 class="code-header">pub const fn <a href="#method.const_new" class="fn">const_new</a>() -> Self</h4></section></summary><div class="docblock"><p>Creates a new empty <code>OnceCell</code> instance.</p>
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<p>Equivalent to <code>OnceCell::new</code>, except that it can be used in static
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variables.</p>
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<p>When using the <code>tracing</code> <a href="../index.html#unstable-features" title="mod tokio">unstable feature</a>, a <code>OnceCell</code> created with
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<code>const_new</code> will not be instrumented. As such, it will not be visible
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in <a href="https://github.com/tokio-rs/console"><code>tokio-console</code></a>. Instead, <a href="struct.OnceCell.html#method.new" title="associated function tokio::sync::OnceCell::new"><code>OnceCell::new</code></a> should be used to
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create an instrumented object if that is needed.</p>
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<h5 id="example"><a class="doc-anchor" href="#example">§</a>Example</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio::sync::OnceCell;
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<span class="kw">static </span>ONCE: OnceCell<u32> = OnceCell::const_new();
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<span class="kw">async fn </span>get_global_integer() -> <span class="kw-2">&</span><span class="lifetime">'static </span>u32 {
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ONCE.get_or_init(|| <span class="kw">async </span>{
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<span class="number">1 </span>+ <span class="number">1
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</span>}).<span class="kw">await
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</span>}
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<span class="kw">let </span>result = get_global_integer().<span class="kw">await</span>;
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<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>result, <span class="number">2</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.new_with" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#185-191">Source</a><h4 class="code-header">pub fn <a href="#method.new_with" class="fn">new_with</a>(value: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T>) -> Self</h4></section></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="toggle method-toggle" open><summary><section id="method.const_new_with" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#223-229">Source</a><h4 class="code-header">pub const fn <a href="#method.const_new_with" class="fn">const_new_with</a>(value: T) -> Self</h4></section></summary><div class="docblock"><p>Creates a new <code>OnceCell</code> that contains the provided value.</p>
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<h5 id="example-1"><a class="doc-anchor" href="#example-1">§</a>Example</h5>
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<p>When using the <code>tracing</code> <a href="../index.html#unstable-features" title="mod tokio">unstable feature</a>, a <code>OnceCell</code> created with
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<code>const_new_with</code> will not be instrumented. As such, it will not be
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visible in <a href="https://github.com/tokio-rs/console"><code>tokio-console</code></a>. Instead, <a href="struct.OnceCell.html#method.new_with" title="associated function tokio::sync::OnceCell::new_with"><code>OnceCell::new_with</code></a> should be
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used to create an instrumented object if that is needed.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio::sync::OnceCell;
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<span class="kw">static </span>ONCE: OnceCell<u32> = OnceCell::const_new_with(<span class="number">1</span>);
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<span class="kw">async fn </span>get_global_integer() -> <span class="kw-2">&</span><span class="lifetime">'static </span>u32 {
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ONCE.get_or_init(|| <span class="kw">async </span>{
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<span class="number">1 </span>+ <span class="number">1
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</span>}).<span class="kw">await
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</span>}
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<span class="kw">let </span>result = get_global_integer().<span class="kw">await</span>;
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<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>result, <span class="number">1</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.initialized" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#233-237">Source</a><h4 class="code-header">pub fn <a href="#method.initialized" class="fn">initialized</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a></h4></section></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="toggle method-toggle" open><summary><section id="method.get" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#277-283">Source</a><h4 class="code-header">pub fn <a href="#method.get" class="fn">get</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&T</a>></h4></section></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="toggle method-toggle" open><summary><section id="method.get_mut" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#291-297">Source</a><h4 class="code-header">pub fn <a href="#method.get_mut" class="fn">get_mut</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&mut T</a>></h4></section></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="toggle method-toggle" open><summary><section id="method.set" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#310-335">Source</a><h4 class="code-header">pub fn <a href="#method.set" class="fn">set</a>(&self, value: T) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, <a class="enum" href="enum.SetError.html" title="enum tokio::sync::SetError">SetError</a><T>></h4></section></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" title="variant tokio::sync::SetError::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" title="variant tokio::sync::SetError::InitializingError"><code>SetError::InitializingError</code></a>.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.get_or_init" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#350-385">Source</a><h4 class="code-header">pub async fn <a href="#method.get_or_init" class="fn">get_or_init</a><F, Fut>(&self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&T</a><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> Fut,
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Fut: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T>,</div></h4></section></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="toggle method-toggle" open><summary><section id="method.get_or_try_init" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#400-438">Source</a><h4 class="code-header">pub async fn <a href="#method.get_or_try_init" class="fn">get_or_try_init</a><E, F, Fut>(&self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&T</a>, E><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> Fut,
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Fut: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E>>,</div></h4></section></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="toggle method-toggle" open><summary><section id="method.into_inner" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#442-450">Source</a><h4 class="code-header">pub fn <a href="#method.into_inner" class="fn">into_inner</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></section></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="toggle method-toggle" open><summary><section id="method.take" class="method"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#454-456">Source</a><h4 class="code-header">pub fn <a href="#method.take" class="fn">take</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h4></section></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></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#90-94">Source</a><a href="#impl-Clone-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#91-93">Source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h4></section></summary><div class='docblock'>Returns a duplicate of the value. <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.93.1/src/core/clone.rs.html#245-247">Source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: &Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#82-88">Source</a><a href="#impl-Debug-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#83-87">Source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, fmt: &mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.93.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#76-80">Source</a><a href="#impl-Default-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#77-79">Source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -> <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.93.1/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Drop-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#104-113">Source</a><a href="#impl-Drop-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.drop" class="method trait-impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#105-112">Source</a><a href="#method.drop" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/ops/drop/trait.Drop.html#tymethod.drop" class="fn">drop</a>(&mut self)</h4></section></summary><div class='docblock'>Executes the destructor for this type. <a href="https://doc.rust-lang.org/1.93.1/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CT%3E-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#115-123">Source</a><a href="#impl-From%3CT%3E-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#116-122">Source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: T) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#96-100">Source</a><a href="#impl-PartialEq-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#97-99">Source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">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/1.93.1/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.93.1/src/core/cmp.rs.html#264">Source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&Rhs</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>!=</code>. The default implementation is almost always sufficient,
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and should not be overridden without very good reason.</div></details></div></details><section id="impl-Eq-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#102">Source</a><a href="#impl-Eq-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section><section id="impl-Send-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#469">Source</a><a href="#impl-Send-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section><section id="impl-Sync-for-OnceCell%3CT%3E" class="impl"><a class="src rightside" href="../../src/tokio/sync/once_cell.rs.html#464">Source</a><a href="#impl-Sync-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-OnceCell%3CT%3E" class="impl"><a href="#impl-Freeze-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> !<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.OnceCell.html" title="struct tokio::sync::OnceCell">OnceCell</a><T></h3></section><section id="impl-RefUnwindSafe-for-OnceCell%3CT%3E" class="impl"><a href="#impl-RefUnwindSafe-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> !<a class="trait" href="https://doc.rust-lang.org/1.93.1/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></section><section id="impl-Unpin-for-OnceCell%3CT%3E" class="impl"><a href="#impl-Unpin-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/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><div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-OnceCell%3CT%3E" class="impl"><a href="#impl-UnwindSafe-for-OnceCell%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> !<a class="trait" href="https://doc.rust-lang.org/1.93.1/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></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/any.rs.html#138">Source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/any.rs.html#139">Source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#212">Source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#214">Source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#221">Source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#222">Source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-CloneToUninit-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/clone.rs.html#547">Source</a><a href="#impl-CloneToUninit-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.CloneToUninit.html" title="trait core::clone::CloneToUninit">CloneToUninit</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone_to_uninit" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/clone.rs.html#549">Source</a><a href="#method.clone_to_uninit" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit" class="fn">clone_to_uninit</a>(&self, dest: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.pointer.html">*mut </a><a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>clone_to_uninit</code>)</span></div></span><div class='docblock'>Performs copy-assignment from <code>self</code> to <code>dest</code>. <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3C!%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#802">Source</a><a href="#impl-From%3C!%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.never.html">!</a>> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-2" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#803">Source</a><a href="#method.from-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.never.html">!</a>) -> T</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#785">Source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#788">Source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#767-769">Source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#777">Source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#85-87">Source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#89">Source</a><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#90">Source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#94">Source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#827-829">Source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#831">Source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#834">Source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#811-813">Source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#815">Source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#818">Source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |