| <!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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href="../../once_cell/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></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><h3><a href="#implementations">Methods</a></h3><ul class="block"><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><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><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><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><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><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><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></section><h2><a href="index.html">In once_cell::sync</a></h2></div></nav><main><div class="width-limiter"><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"><a href="../../help.html">?</a></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><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">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></h1><span class="out-of-band"><a class="srclink" href="../../src/once_cell/lib.rs.html#1257-1260">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct Lazy<T, F = fn() -> 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> |
| <p>This type is thread-safe and can be used in statics.</p> |
| <h2 id="example"><a href="#example">Example</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::collections::HashMap; |
| |
| <span class="kw">use </span>once_cell::sync::Lazy; |
| |
| <span class="kw">static </span>HASHMAP: Lazy<HashMap<i32, String>> = Lazy::new(|| { |
| <span class="macro">println!</span>(<span class="string">"initializing"</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>m = HashMap::new(); |
| m.insert(<span class="number">13</span>, <span class="string">"Spica"</span>.to_string()); |
| m.insert(<span class="number">74</span>, <span class="string">"Hoyten"</span>.to_string()); |
| m |
| }); |
| |
| <span class="kw">fn </span>main() { |
| <span class="macro">println!</span>(<span class="string">"ready"</span>); |
| std::thread::spawn(|| { |
| <span class="macro">println!</span>(<span class="string">"{:?}"</span>, HASHMAP.get(<span class="kw-2">&</span><span class="number">13</span>)); |
| }).join().unwrap(); |
| <span class="macro">println!</span>(<span class="string">"{:?}"</span>, HASHMAP.get(<span class="kw-2">&</span><span class="number">74</span>)); |
| |
| <span class="comment">// Prints: |
| // ready |
| // initializing |
| // Some("Spica") |
| // Some("Hoyten") |
| </span>}</code></pre></div> |
| </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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1277-1294">source</a><a href="#impl-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1280-1282">source</a><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 |
| function.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_value" class="method has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1287-1293">source</a><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>) -> Result<T, F></h4></section></summary><div class="docblock"><p>Consumes this <code>Lazy</code> returning the stored value.</p> |
| <p>Returns <code>Ok(value)</code> if <code>Lazy</code> is initialized and <code>Err(f)</code> otherwise.</p> |
| </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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1296-1373">source</a><a href="#impl-Lazy%3CT%2C%20F%3E-1" class="anchor"></a><h3 class="code-header">impl<T, F: FnOnce() -> 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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1310-1315">source</a><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>) -> &T</h4></section></summary><div class="docblock"><p>Forces the evaluation of this lazy value and |
| returns a reference to the result. This is equivalent |
| to the <code>Deref</code> impl, but is explicit.</p> |
| <h5 id="example-1"><a href="#example-1">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>once_cell::sync::Lazy; |
| |
| <span class="kw">let </span>lazy = Lazy::new(|| <span class="number">92</span>); |
| |
| <span class="macro">assert_eq!</span>(Lazy::force(<span class="kw-2">&</span>lazy), <span class="kw-2">&</span><span class="number">92</span>); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&*</span>lazy, <span class="kw-2">&</span><span class="number">92</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.force_mut" class="method has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1329-1338">source</a><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>) -> &mut T</h4></section></summary><div class="docblock"><p>Forces the evaluation of this lazy value and |
| returns a mutable reference to the result. This is equivalent |
| to the <code>Deref</code> impl, but is explicit.</p> |
| <h5 id="example-2"><a href="#example-2">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>once_cell::sync::Lazy; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>lazy = Lazy::new(|| <span class="number">92</span>); |
| |
| <span class="macro">assert_eq!</span>(Lazy::force_mut(<span class="kw-2">&mut </span>lazy), <span class="kw-2">&mut </span><span class="number">92</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get" class="method has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1353-1355">source</a><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>) -> Option<&T></h4></section></summary><div class="docblock"><p>Gets the reference to the result of this lazy value if |
| it was initialized, otherwise returns <code>None</code>.</p> |
| <h5 id="example-3"><a href="#example-3">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>once_cell::sync::Lazy; |
| |
| <span class="kw">let </span>lazy = Lazy::new(|| <span class="number">92</span>); |
| |
| <span class="macro">assert_eq!</span>(Lazy::get(<span class="kw-2">&</span>lazy), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&*</span>lazy, <span class="kw-2">&</span><span class="number">92</span>); |
| <span class="macro">assert_eq!</span>(Lazy::get(<span class="kw-2">&</span>lazy), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">92</span>));</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get_mut" class="method has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1370-1372">source</a><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>) -> Option<&mut T></h4></section></summary><div class="docblock"><p>Gets the reference to the result of this lazy value if |
| it was initialized, otherwise returns <code>None</code>.</p> |
| <h5 id="example-4"><a href="#example-4">Example</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>once_cell::sync::Lazy; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>lazy = Lazy::new(|| <span class="number">92</span>); |
| |
| <span class="macro">assert_eq!</span>(Lazy::get_mut(<span class="kw-2">&mut </span>lazy), <span class="prelude-val">None</span>); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&*</span>lazy, <span class="kw-2">&</span><span class="number">92</span>); |
| <span class="macro">assert_eq!</span>(Lazy::get_mut(<span class="kw-2">&mut </span>lazy), <span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">92</span>));</code></pre></div> |
| </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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1262-1266">source</a><a href="#impl-Debug-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T: Debug, F> Debug 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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1263-1265">source</a><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a class="fnname">fmt</a>(&self, f: &mut Formatter<'_>) -> Result</h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Default-for-Lazy%3CT%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1388-1393">source</a><a href="#impl-Default-for-Lazy%3CT%3E" class="anchor"></a><h3 class="code-header">impl<T: Default> Default 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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1390-1392">source</a><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a 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> |
| </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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1375-1380">source</a><a href="#impl-Deref-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, F: FnOnce() -> T> Deref 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 class="associatedtype">Target</a> = T</h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1377-1379">source</a><a href="#method.deref" class="anchor"></a><h4 class="code-header">fn <a class="fnname">deref</a>(&self) -> &T</h4></section></summary><div class='docblock'>Dereferences the value.</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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1382-1386">source</a><a href="#impl-DerefMut-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, F: FnOnce() -> T> DerefMut 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"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1383-1385">source</a><a href="#method.deref_mut" class="anchor"></a><h4 class="code-header">fn <a class="fnname">deref_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably dereferences the value.</div></details></div></details><section id="impl-RefUnwindSafe-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1275">source</a><a href="#impl-RefUnwindSafe-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, F: RefUnwindSafe> RefUnwindSafe 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>: RefUnwindSafe,</span></h3></section><section id="impl-Sync-for-Lazy%3CT%2C%20F%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/once_cell/lib.rs.html#1272">source</a><a href="#impl-Sync-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, F: Send> Sync 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>: Sync,</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">impl<T, F> Send 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: Send,<br> T: Send,</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">impl<T, F> Unpin 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: Unpin,<br> T: Unpin,</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">impl<T, F> UnwindSafe 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: UnwindSafe,<br> T: UnwindSafe,</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"><a href="#impl-Any-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> Any for T<span class="where fmt-newline">where<br> T: 'static + ?Sized,</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"><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a class="fnname">type_id</a>(&self) -> TypeId</h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a>Read more</a></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"><a href="#impl-Borrow%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> Borrow<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</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="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow</a>(&self) -> &T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a>Read more</a></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"><a href="#impl-BorrowMut%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> BorrowMut<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</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="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a>Read more</a></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"><a href="#impl-From%3CT%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T> From<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="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a 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"><a href="#impl-Into%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, U> Into<U> for T<span class="where fmt-newline">where<br> U: From<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="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a 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>[From]<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"><a href="#impl-TryFrom%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryFrom<U> for T<span class="where fmt-newline">where<br> U: Into<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 class="associatedtype">Error</a> = Infallible</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_from</a>(value: U) -> Result<T, <T as TryFrom<U>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</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"><a href="#impl-TryInto%3CU%3E-for-Lazy%3CT%2C%20F%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryInto<U> for T<span class="where fmt-newline">where<br> U: TryFrom<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 class="associatedtype">Error</a> = <U as TryFrom<T>>::Error</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_into</a>(self) -> Result<U, <U as TryFrom<T>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="once_cell" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
