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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `OnceCell` struct in crate `once_cell`."><meta name="keywords" content="rust, rustlang, rust-lang, OnceCell"><title>once_cell::sync::OnceCell - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../once_cell/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Struct OnceCell</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#implementations">Methods</a><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.get_unchecked">get_unchecked</a><a href="#method.into_inner">into_inner</a><a href="#method.new">new</a><a href="#method.set">set</a><a href="#method.take">take</a></div><a class="sidebar-title" href="#trait-implementations">Trait Implementations</a><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-Eq">Eq</a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-PartialEq%3COnceCell%3CT%3E%3E">PartialEq<OnceCell<T>></a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-RefUnwindSafe">RefUnwindSafe</a><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">UnwindSafe</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow<T></a><a href="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><a href="#impl-From%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><p class="location"><a href="../index.html">once_cell</a>::<wbr><a href="index.html">sync</a></p><div id="sidebar-vars" data-name="OnceCell" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Struct <a href="../index.html">once_cell</a>::<wbr><a href="index.html">sync</a>::<wbr><a class="struct" href="">OnceCell</a></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/once_cell/lib.rs.html#699" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust struct">pub struct OnceCell<T>(_);</pre></div><div class="docblock"><p>A thread-safe cell which can be written to only once.</p>
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<p><code>OnceCell</code> provides <code>&</code> references to the contents without RAII guards.</p>
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<p>Reading a non-<code>None</code> value out of <code>OnceCell</code> establishes a
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happens-before relationship with a corresponding write. For example, if
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thread A initializes the cell with <code>get_or_init(f)</code>, and thread B
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subsequently reads the result of this call, B also observes all the side
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effects of <code>f</code>.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">once_cell</span>::<span class="ident">sync</span>::<span class="ident">OnceCell</span>;
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<span class="kw">static</span> <span class="ident">CELL</span>: <span class="ident">OnceCell</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">CELL</span>.<span class="ident">get</span>().<span class="ident">is_none</span>());
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<span class="ident">std</span>::<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="kw">let</span> <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">String</span> <span class="op">=</span> <span class="ident">CELL</span>.<span class="ident">get_or_init</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="string">"Hello, World!"</span>.<span class="ident">to_string</span>()
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});
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="string">"Hello, World!"</span>);
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}).<span class="ident">join</span>().<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">value</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="ident">CELL</span>.<span class="ident">get</span>();
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">is_some</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>.<span class="ident">unwrap</span>().<span class="ident">as_str</span>(), <span class="string">"Hello, World!"</span>);</pre></div>
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</div><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><h3 id="impl" class="impl"><code class="in-band">impl<T> <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#745-931" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.new" class="method"><code>pub const fn <a href="#method.new" class="fnname">new</a>() -> <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#747-749" title="goto source code">[src]</a></h4><div class="docblock"><p>Creates a new empty cell.</p>
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</div><h4 id="method.get" class="method"><code>pub fn <a href="#method.get" class="fnname">get</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#755-762" title="goto source code">[src]</a></h4><div class="docblock"><p>Gets the reference to the underlying value.</p>
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<p>Returns <code>None</code> if the cell is empty, or being initialized. This
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method never blocks.</p>
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</div><h4 id="method.get_mut" class="method"><code>pub fn <a href="#method.get_mut" class="fnname">get_mut</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#767-769" title="goto source code">[src]</a></h4><div class="docblock"><p>Gets the mutable reference to the underlying value.</p>
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<p>Returns <code>None</code> if the cell is empty.</p>
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</div><h4 id="method.get_unchecked" class="method"><code>pub unsafe fn <a href="#method.get_unchecked" class="fnname">get_unchecked</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><a class="srclink" href="../../src/once_cell/lib.rs.html#778-780" title="goto source code">[src]</a></h4><div class="docblock"><p>Get the reference to the underlying value, without checking if the
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cell is initialized.</p>
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<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
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<p>Caller must ensure that the cell is in initialized state, and that
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the contents are acquired by (synchronized to) this thread.</p>
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</div><h4 id="method.set" class="method"><code>pub fn <a href="#method.set" class="fnname">set</a>(&self, value: T) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#805-812" title="goto source code">[src]</a></h4><div class="docblock"><p>Sets the contents of this cell to <code>value</code>.</p>
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<p>Returns <code>Ok(())</code> if the cell was empty and <code>Err(value)</code> if it was
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full.</p>
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<h1 id="example-1" class="section-header"><a href="#example-1">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">once_cell</span>::<span class="ident">sync</span>::<span class="ident">OnceCell</span>;
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<span class="kw">static</span> <span class="ident">CELL</span>: <span class="ident">OnceCell</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">CELL</span>.<span class="ident">get</span>().<span class="ident">is_none</span>());
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<span class="ident">std</span>::<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CELL</span>.<span class="ident">set</span>(<span class="number">92</span>), <span class="prelude-val">Ok</span>(()));
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}).<span class="ident">join</span>().<span class="ident">unwrap</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CELL</span>.<span class="ident">set</span>(<span class="number">62</span>), <span class="prelude-val">Err</span>(<span class="number">62</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">CELL</span>.<span class="ident">get</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">92</span>));
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}</pre></div>
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</div><h4 id="method.get_or_init" class="method"><code>pub fn <a href="#method.get_or_init" class="fnname">get_or_init</a><F>(&self, f: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> T, </span></code><a class="srclink" href="../../src/once_cell/lib.rs.html#840-849" title="goto source code">[src]</a></h4><div class="docblock"><p>Gets the contents of the cell, initializing it with <code>f</code> if the cell
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was empty.</p>
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<p>Many threads may call <code>get_or_init</code> concurrently with different
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initializing functions, but it is guaranteed that only one function
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will be executed.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>If <code>f</code> panics, the panic is propagated to the caller, and the cell
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remains uninitialized.</p>
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<p>It is an error to reentrantly initialize the cell from <code>f</code>. The
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exact outcome is unspecified. Current implementation deadlocks, but
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this may be changed to a panic in the future.</p>
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<h1 id="example-2" class="section-header"><a href="#example-2">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">once_cell</span>::<span class="ident">sync</span>::<span class="ident">OnceCell</span>;
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<span class="kw">let</span> <span class="ident">cell</span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">cell</span>.<span class="ident">get_or_init</span>(<span class="op">|</span><span class="op">|</span> <span class="number">92</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="kw-2">&</span><span class="number">92</span>);
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<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">cell</span>.<span class="ident">get_or_init</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">unreachable</span><span class="macro">!</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="kw-2">&</span><span class="number">92</span>);</pre></div>
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</div><h4 id="method.get_or_try_init" class="method"><code>pub fn <a href="#method.get_or_try_init" class="fnname">get_or_try_init</a><F, E>(&self, f: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T, E> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, E>, </span></code><a class="srclink" href="../../src/once_cell/lib.rs.html#877-890" title="goto source code">[src]</a></h4><div class="docblock"><p>Gets the contents of the cell, initializing it with <code>f</code> if
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the cell was empty. If the cell was empty and <code>f</code> failed, an
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error is returned.</p>
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<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
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<p>If <code>f</code> panics, the panic is propagated to the caller, and
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the cell remains uninitialized.</p>
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<p>It is an error to reentrantly initialize the cell from <code>f</code>.
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The exact outcome is unspecified. Current implementation
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deadlocks, but this may be changed to a panic in the future.</p>
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<h1 id="example-3" class="section-header"><a href="#example-3">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">once_cell</span>::<span class="ident">sync</span>::<span class="ident">OnceCell</span>;
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<span class="kw">let</span> <span class="ident">cell</span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">get_or_try_init</span>(<span class="op">|</span><span class="op">|</span> <span class="prelude-val">Err</span>(())), <span class="prelude-val">Err</span>(()));
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">get</span>().<span class="ident">is_none</span>());
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<span class="kw">let</span> <span class="ident">value</span> <span class="op">=</span> <span class="ident">cell</span>.<span class="ident">get_or_try_init</span>(<span class="op">|</span><span class="op">|</span> <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">i32</span>, ()<span class="op">></span> {
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<span class="prelude-val">Ok</span>(<span class="number">92</span>)
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});
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">value</span>, <span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="number">92</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">get</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">92</span>))</pre></div>
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</div><h4 id="method.take" class="method"><code>pub fn <a href="#method.take" class="fnname">take</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#909-911" title="goto source code">[src]</a></h4><div class="docblock"><p>Takes the value out of this <code>OnceCell</code>, moving it back to an uninitialized state.</p>
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<p>Has no effect and returns <code>None</code> if the <code>OnceCell</code> hasn't been initialized.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">once_cell</span>::<span class="ident">sync</span>::<span class="ident">OnceCell</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cell</span>: <span class="ident">OnceCell</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">take</span>(), <span class="prelude-val">None</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cell</span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="ident">cell</span>.<span class="ident">set</span>(<span class="string">"hello"</span>.<span class="ident">to_string</span>()).<span class="ident">unwrap</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">take</span>(), <span class="prelude-val">Some</span>(<span class="string">"hello"</span>.<span class="ident">to_string</span>()));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">get</span>(), <span class="prelude-val">None</span>);</pre></div>
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</div><h4 id="method.into_inner" class="method"><code>pub fn <a href="#method.into_inner" class="fnname">into_inner</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#928-930" title="goto source code">[src]</a></h4><div class="docblock"><p>Consumes the <code>OnceCell</code>, returning the wrapped value. Returns
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<code>None</code> if the cell was empty.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
|
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<div class="example-wrap"><pre class="rust rust-example-rendered">
|
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<span class="kw">use</span> <span class="ident">once_cell</span>::<span class="ident">sync</span>::<span class="ident">OnceCell</span>;
|
||
|
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<span class="kw">let</span> <span class="ident">cell</span>: <span class="ident">OnceCell</span><span class="op"><</span><span class="ident">String</span><span class="op">></span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">into_inner</span>(), <span class="prelude-val">None</span>);
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<span class="kw">let</span> <span class="ident">cell</span> <span class="op">=</span> <span class="ident">OnceCell</span>::<span class="ident">new</span>();
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<span class="ident">cell</span>.<span class="ident">set</span>(<span class="string">"hello"</span>.<span class="ident">to_string</span>()).<span class="ident">unwrap</span>();
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">cell</span>.<span class="ident">into_inner</span>(), <span class="prelude-val">Some</span>(<span class="string">"hello"</span>.<span class="ident">to_string</span>()));</pre></div>
|
||
</div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><h3 id="impl-Clone" class="impl"><code class="in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl-Clone" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#716-727" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.clone" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone" class="fnname">clone</a>(&self) -> <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#717-726" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
|
||
</div><h4 id="method.clone_from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.reference.html">&</a>Self)</code><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/clone.rs.html#128" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
|
||
</div></div><h3 id="impl-Debug" class="impl"><code class="in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl-Debug" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#707-714" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.fmt" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class="srclink" href="../../src/once_cell/lib.rs.html#708-713" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
|
||
</div></div><h3 id="impl-Default" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl-Default" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#701-705" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.default" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default" class="fnname">default</a>() -> <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a class="srclink" href="../../src/once_cell/lib.rs.html#702-704" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
|
||
</div></div><h3 id="impl-Eq" class="impl"><code class="in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl-Eq" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#743" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-From%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl-From%3CT%3E" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#729-735" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(value: T) -> Self</code><a class="srclink" href="../../src/once_cell/lib.rs.html#730-734" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-PartialEq%3COnceCell%3CT%3E%3E" class="impl"><code class="in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a><<a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T>> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T></code><a href="#impl-PartialEq%3COnceCell%3CT%3E%3E" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#737-741" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.eq" class="method hidden"><code>fn <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq" class="fnname">eq</a>(&self, other: &<a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a class="srclink" href="../../src/once_cell/lib.rs.html#738-740" title="goto source code">[src]</a></h4><div class='docblock hidden'><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/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
||
</div><h4 id="method.ne" class="method hidden"><code><span class="docblock attributes">#[must_use]</span>pub fn <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne" class="fnname">ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Rhs) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/cmp.rs.html#213" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>This method tests for <code>!=</code>.</p>
|
||
</div></div></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><h3 id="impl-RefUnwindSafe" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a>, </span></code><a href="#impl-RefUnwindSafe" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Send" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code><a href="#impl-Send" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Sync" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>, </span></code><a href="#impl-Sync" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-Unpin" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>, </span></code><a href="#impl-Unpin" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div><h3 id="impl-UnwindSafe" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a> for <a class="struct" href="../../once_cell/sync/struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a>, </span></code><a href="#impl-UnwindSafe" class="anchor"></a><a class="srclink" href="../../src/once_cell/lib.rs.html#1" title="goto source code">[src]</a></h3><div class="impl-items"></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><h3 id="impl-Any" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-Any" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#131-135" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.type_id" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#132" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
|
||
</div></div><h3 id="impl-Borrow%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-Borrow%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#207-211" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#208" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
|
||
</div></div><h3 id="impl-BorrowMut%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214-218" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.borrow_mut" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#215" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
|
||
</div></div><h3 id="impl-From%3C!%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.never.html">!</a>> for T</code><a href="#impl-From%3C!%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#560-564" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-2" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.never.html">!</a>) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#561" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-From%3CT%3E-1" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</code><a href="#impl-From%3CT%3E-1" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#545-549" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.from-1" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#546" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-Into%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></code><a href="#impl-Into%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#534-541" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#538" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
|
||
</div></div><h3 id="impl-ToOwned" class="impl"><code class="in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/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/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, </span></code><a href="#impl-ToOwned" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#80-92" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Owned" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="type">Owned</a> = T</code></h4><div class='docblock'><p>The resulting type after obtaining ownership.</p>
|
||
</div><h4 id="method.to_owned" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fnname">to_owned</a>(&self) -> T</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#85" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></p>
|
||
</div><h4 id="method.clone_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fnname">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T)</code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#89" title="goto source code">[src]</a></h4><div class="item-info hidden"><div class="stab unstable"><details><summary><span class="emoji">🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code>)</summary><p>recently added</p>
|
||
</details></div></div><div class='docblock hidden'><p>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></p>
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</div></div><h3 id="impl-TryFrom%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></code><a href="#impl-TryFrom%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#582-591" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="type">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_from" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#588" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id="impl-TryInto%3CU%3E" class="impl"><code class="in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><a href="#impl-TryInto%3CU%3E" class="anchor"></a><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#568-577" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-1" class="type"><code>type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="type">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id="method.try_into" class="method hidden"><code>pub fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class="srclink" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#574" title="goto source code">[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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