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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 value which is initialized on the first access."><meta name="keywords" content="rust, rustlang, rust-lang, Lazy"><title>Lazy in once_cell::sync - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" 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class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../once_cell/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../once_cell/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Lazy</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#implementations">Methods</a></h3><ul><li><a href="#method.force">force</a></li><li><a href="#method.force_mut">force_mut</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_mut">get_mut</a></li><li><a href="#method.into_value">into_value</a></li><li><a href="#method.new">new</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#trait-implementations">Trait Implementations</a></h3><ul><li><a href="#impl-Debug-for-Lazy%3CT%2C%20F%3E">Debug</a></li><li><a href="#impl-Default-for-Lazy%3CT%3E">Default</a></li><li><a href="#impl-Deref-for-Lazy%3CT%2C%20F%3E">Deref</a></li><li><a href="#impl-DerefMut-for-Lazy%3CT%2C%20F%3E">DerefMut</a></li><li><a href="#impl-RefUnwindSafe-for-Lazy%3CT%2C%20F%3E">RefUnwindSafe</a></li><li><a href="#impl-Sync-for-Lazy%3CT%2C%20F%3E">Sync</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul><li><a href="#impl-Send-for-Lazy%3CT%2C%20F%3E">Send</a></li><li><a href="#impl-Unpin-for-Lazy%3CT%2C%20F%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Lazy%3CT%2C%20F%3E">UnwindSafe</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#blanket-implementations">Blanket Implementations</a></h3><ul><li><a href="#impl-Any-for-Lazy%3CT%2C%20F%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-Lazy%3CT%2C%20F%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-Lazy%3CT%2C%20F%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-Lazy%3CT%2C%20F%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-Lazy%3CT%2C%20F%3E">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-Lazy%3CT%2C%20F%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-Lazy%3CT%2C%20F%3E">TryInto<U></a></li></ul></div></section><h2 class="location"><a href="index.html">In once_cell::sync</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../once_cell/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><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="#">Lazy</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/once_cell/lib.rs.html#1220-1223">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust struct"><code>pub struct Lazy<T, F = <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.fn.html">fn</a>() -> T> { /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A value which is initialized on the first access.</p>
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<p>This type is thread-safe and can be used in statics.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">std::collections::HashMap</span>;
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<span class="kw">use</span> <span class="ident">once_cell::sync::Lazy</span>;
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<span class="kw">static</span> <span class="ident">HASHMAP</span>: <span class="ident">Lazy</span><span class="op"><</span><span class="ident">HashMap</span><span class="op"><</span><span class="ident">i32</span>, <span class="ident">String</span><span class="op">></span><span class="op">></span> <span class="op">=</span> <span class="ident">Lazy::new</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="macro">println!</span>(<span class="string">"initializing"</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">HashMap::new</span>();
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<span class="ident">m</span>.<span class="ident">insert</span>(<span class="number">13</span>, <span class="string">"Spica"</span>.<span class="ident">to_string</span>());
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<span class="ident">m</span>.<span class="ident">insert</span>(<span class="number">74</span>, <span class="string">"Hoyten"</span>.<span class="ident">to_string</span>());
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<span class="ident">m</span>
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});
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="macro">println!</span>(<span class="string">"ready"</span>);
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<span class="ident">std::thread::spawn</span>(<span class="op">|</span><span class="op">|</span> {
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<span class="macro">println!</span>(<span class="string">"{:?}"</span>, <span class="ident">HASHMAP</span>.<span class="ident">get</span>(<span class="kw-2">&</span><span class="number">13</span>));
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}).<span class="ident">join</span>().<span class="ident">unwrap</span>();
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<span class="macro">println!</span>(<span class="string">"{:?}"</span>, <span class="ident">HASHMAP</span>.<span class="ident">get</span>(<span class="kw-2">&</span><span class="number">74</span>));
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<span class="comment">// Prints:</span>
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<span class="comment">// ready</span>
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<span class="comment">// initializing</span>
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<span class="comment">// Some("Spica")</span>
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<span class="comment">// Some("Hoyten")</span>
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}</code></pre></div>
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</div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1240-1257">source</a></span><a href="#impl-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F> <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.new" class="method has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1243-1245">source</a></span><h4 class="code-header">pub const fn <a href="#method.new" class="fnname">new</a>(f: F) -> <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F></h4></section></summary><div class="docblock"><p>Creates a new lazy value with the given initializing
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function.</p>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_value" class="method has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1250-1256">source</a></span><h4 class="code-header">pub fn <a href="#method.into_value" class="fnname">into_value</a>(this: <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, F></h4></section></summary><div class="docblock"><p>Consumes this <code>Lazy</code> returning the stored value.</p>
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<p>Returns <code>Ok(value)</code> if <code>Lazy</code> is initialized and <code>Err(f)</code> otherwise.</p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Lazy%3CT%2C%20F%3E-1" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1259-1330">source</a></span><a href="#impl-Lazy%3CT%2C%20F%3E-1" class="anchor"></a><h3 class="code-header in-band">impl<T, F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> T> <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.force" class="method has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1273-1278">source</a></span><h4 class="code-header">pub fn <a href="#method.force" class="fnname">force</a>(this: &<a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F>) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&</a>T</h4></section></summary><div class="docblock"><p>Forces the evaluation of this lazy value and
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returns a reference to the result. This is equivalent
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to the <code>Deref</code> impl, but is explicit.</p>
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<h5 id="example-1"><a href="#example-1">Example</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">once_cell::sync::Lazy</span>;
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<span class="kw">let</span> <span class="ident">lazy</span> <span class="op">=</span> <span class="ident">Lazy::new</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="ident">Lazy::force</span>(<span class="kw-2">&</span><span class="ident">lazy</span>), <span class="kw-2">&</span><span class="number">92</span>);
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<span class="macro">assert_eq!</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">lazy</span>, <span class="kw-2">&</span><span class="number">92</span>);</code></pre></div>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.force_mut" class="method has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1292-1295">source</a></span><h4 class="code-header">pub fn <a href="#method.force_mut" class="fnname">force_mut</a>(this: &mut <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F>) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&mut </a>T</h4></section></summary><div class="docblock"><p>Forces the evaluation of this lazy value and
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returns a mutable reference to the result. This is equivalent
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to the <code>Deref</code> impl, but is explicit.</p>
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<h5 id="example-2"><a href="#example-2">Example</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">once_cell::sync::Lazy</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lazy</span> <span class="op">=</span> <span class="ident">Lazy::new</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="ident">Lazy::force_mut</span>(<span class="kw-2">&mut</span> <span class="ident">lazy</span>), <span class="kw-2">&mut</span> <span class="number">92</span>);</code></pre></div>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get" class="method has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1310-1312">source</a></span><h4 class="code-header">pub fn <a href="#method.get" class="fnname">get</a>(this: &<a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&</a>T></h4></section></summary><div class="docblock"><p>Gets the reference to the result of this lazy value if
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it was initialized, otherwise returns <code>None</code>.</p>
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<h5 id="example-3"><a href="#example-3">Example</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">once_cell::sync::Lazy</span>;
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<span class="kw">let</span> <span class="ident">lazy</span> <span class="op">=</span> <span class="ident">Lazy::new</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="ident">Lazy::get</span>(<span class="kw-2">&</span><span class="ident">lazy</span>), <span class="prelude-val">None</span>);
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<span class="macro">assert_eq!</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">lazy</span>, <span class="kw-2">&</span><span class="number">92</span>);
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<span class="macro">assert_eq!</span>(<span class="ident">Lazy::get</span>(<span class="kw-2">&</span><span class="ident">lazy</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">92</span>));</code></pre></div>
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</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get_mut" class="method has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1327-1329">source</a></span><h4 class="code-header">pub fn <a href="#method.get_mut" class="fnname">get_mut</a>(this: &mut <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F>) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&mut </a>T></h4></section></summary><div class="docblock"><p>Gets the reference to the result of this lazy value if
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it was initialized, otherwise returns <code>None</code>.</p>
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<h5 id="example-4"><a href="#example-4">Example</a></h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">once_cell::sync::Lazy</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lazy</span> <span class="op">=</span> <span class="ident">Lazy::new</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="ident">Lazy::get_mut</span>(<span class="kw-2">&mut</span> <span class="ident">lazy</span>), <span class="prelude-val">None</span>);
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<span class="macro">assert_eq!</span>(<span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">lazy</span>, <span class="kw-2">&</span><span class="number">92</span>);
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<span class="macro">assert_eq!</span>(<span class="ident">Lazy::get_mut</span>(<span class="kw-2">&mut</span> <span class="ident">lazy</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&mut</span> <span class="number">92</span>));</code></pre></div>
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</div></details></div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Debug-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1225-1229">source</a></span><a href="#impl-Debug-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, F> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1226-1228">source</a></span><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fnname">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.64.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.64.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.64.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Default-for-Lazy%3CT%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1346-1351">source</a></span><a href="#impl-Default-for-Lazy%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a>> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.default" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1348-1350">source</a></span><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/default/trait.Default.html#tymethod.default" class="fnname">default</a>() -> <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T></h4></section></summary><div class="docblock"><p>Creates a new lazy value using <code>Default</code> as the initializing function.</p>
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</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Deref-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1332-1337">source</a></span><a href="#impl-Deref-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> T> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Target" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.64.0/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = T</h4></section></summary><div class='docblock'><p>The resulting type after dereferencing.</p>
|
||
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1334-1336">source</a></span><a href="#method.deref" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/ops/deref/trait.Deref.html#tymethod.deref" class="fnname">deref</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&</a>T</h4></section></summary><div class='docblock'><p>Dereferences the value.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-DerefMut-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1339-1344">source</a></span><a href="#impl-DerefMut-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> T> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.deref_mut" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1340-1343">source</a></span><a href="#method.deref_mut" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/ops/deref/trait.DerefMut.html#tymethod.deref_mut" class="fnname">deref_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&mut </a>T</h4></section></summary><div class='docblock'><p>Mutably dereferences the value.</p>
|
||
</div></details></div></details><section id="impl-RefUnwindSafe-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1238">source</a></span><a href="#impl-RefUnwindSafe-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F> <span class="where fmt-newline">where<br> <a class="struct" href="struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T>: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>, </span></h3></section><section id="impl-Sync-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../../src/once_cell/lib.rs.html#1235">source</a></span><a href="#impl-Sync-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F> <span class="where fmt-newline">where<br> <a class="struct" href="struct.OnceCell.html" title="struct once_cell::sync::OnceCell">OnceCell</a><T>: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>, </span></h3></section></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"><section id="impl-Send-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><a href="#impl-Send-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></h3></section><section id="impl-Unpin-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><a href="#impl-Unpin-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>, </span></h3></section><section id="impl-UnwindSafe-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, F> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Lazy.html" title="struct once_cell::sync::Lazy">Lazy</a><T, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>, </span></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/any.rs.html#203">source</a></span><a href="#impl-Any-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/any.rs.html#204">source</a></span><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.64.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.64.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/borrow.rs.html#209">source</a></span><a href="#impl-Borrow%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/borrow.rs.html#211">source</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&</a>T</h4></section></summary><div class='docblock'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.64.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/borrow.rs.html#218">source</a></span><a href="#impl-BorrowMut%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/borrow.rs.html#219">source</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.reference.html">&mut </a>T</h4></section></summary><div class='docblock'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.64.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#557">source</a></span><a href="#impl-From%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#559">source</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#541">source</a></span><a href="#impl-Into%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#549">source</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html#tymethod.into" class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
|
||
<p>That is, this conversion is whatever the implementation of
|
||
<code><a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.From.html" title="From">From</a><T> for U</code> chooses to do.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#598">source</a></span><a href="#impl-TryFrom%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'><p>The type returned in the event of a conversion error.</p>
|
||
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#604">source</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fnname">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'><p>Performs the conversion.</p>
|
||
</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#583">source</a></span><a href="#impl-TryInto%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header in-band">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'><p>The type returned in the event of a conversion error.</p>
|
||
</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="rightside"><span class="since" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span> · <a class="srclink" href="https://doc.rust-lang.org/1.64.0/src/core/convert/mod.rs.html#589">source</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fnname">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'><p>Performs the conversion.</p>
|
||
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