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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="Trait implemented by types which can be cleared in place, retaining any allocated memory."><title>Clear in sharded_slab - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="sharded_slab" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../sharded_slab/index.html">sharded_slab</a><span class="version">0.1.7</span></h2></div><h2 class="location"><a href="#">Clear</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.clear">clear</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Clear-for-Box%3CT%3E">Box<T></a></li><li><a href="#impl-Clear-for-HashMap%3CK,+V,+S%3E">HashMap<K, V, S></a></li><li><a href="#impl-Clear-for-HashSet%3CT,+S%3E">HashSet<T, S></a></li><li><a href="#impl-Clear-for-Mutex%3CT%3E">Mutex<T></a></li><li><a href="#impl-Clear-for-Option%3CT%3E">Option<T></a></li><li><a href="#impl-Clear-for-RwLock%3CT%3E">RwLock<T></a></li><li><a href="#impl-Clear-for-String">String</a></li><li><a href="#impl-Clear-for-Vec%3CT%3E">Vec<T></a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate sharded_slab</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../sharded_slab/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">sharded_slab</a>::<wbr><a class="trait" href="#">Clear</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/sharded_slab/clear.rs.html#24-27">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait Clear {
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// Required method
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fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self);
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Trait implemented by types which can be cleared in place, retaining any
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allocated memory.</p>
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<p>This is essentially a generalization of methods on standard library
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collection types, including as <a href="https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.clear"><code>Vec::clear</code></a>, <a href="https://doc.rust-lang.org/stable/std/string/struct.String.html#method.clear"><code>String::clear</code></a>, and
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<a href="https://doc.rust-lang.org/stable/std/collections/struct.HashMap.html#method.clear"><code>HashMap::clear</code></a>. These methods drop all data stored in the collection,
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but retain the collection’s heap allocation for future use. Types such as
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<code>BTreeMap</code>, whose <code>clear</code> methods drops allocations, should not
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implement this trait.</p>
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<p>When implemented for types which do not own a heap allocation, <code>Clear</code>
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should reset the type in place if possible. If the type has an empty state
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or stores <code>Option</code>s, those values should be reset to the empty state. For
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“plain old data” types, which hold no pointers to other data and do not have
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an empty or initial state, it’s okay for a <code>Clear</code> implementation to be a
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no-op. In that case, it essentially serves as a marker indicating that the
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type may be reused to store new data.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.clear" class="method"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#26">source</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></summary><div class="docblock"><p>Clear all data in <code>self</code>, retaining the allocated capacithy.</p>
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</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-String" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#74-79">source</a><a href="#impl-Clear-for-String" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h3></section></summary><div class="impl-items"><section id="method.clear" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#76-78">source</a><a href="#method.clear" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-HashMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#52-61">source</a><a href="#impl-Clear-for-HashMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/collections/hash/map/struct.HashMap.html" title="struct std::collections::hash::map::HashMap">HashMap</a><K, V, S><div class="where">where
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K: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
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S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="impl-items"><section id="method.clear-1" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#58-60">source</a><a href="#method.clear-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-Option%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#29-33">source</a><a href="#impl-Clear-for-Option%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></h3></section></summary><div class="impl-items"><section id="method.clear-2" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#30-32">source</a><a href="#method.clear-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-Box%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#35-43">source</a><a href="#impl-Clear-for-Box%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><T><div class="where">where
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T: <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a>,</div></h3></section></summary><div class="impl-items"><section id="method.clear-3" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#40-42">source</a><a href="#method.clear-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-Vec%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#45-50">source</a><a href="#impl-Clear-for-Vec%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><T></h3></section></summary><div class="impl-items"><section id="method.clear-4" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#47-49">source</a><a href="#method.clear-4" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-HashSet%3CT,+S%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#63-72">source</a><a href="#impl-Clear-for-HashSet%3CT,+S%3E" class="anchor">§</a><h3 class="code-header">impl<T, S> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S><div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
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S: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h3></section></summary><div class="impl-items"><section id="method.clear-5" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#69-71">source</a><a href="#method.clear-5" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-Mutex%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#81-86">source</a><a href="#impl-Clear-for-Mutex%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a>> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/sync/mutex/struct.Mutex.html" title="struct std::sync::mutex::Mutex">Mutex</a><T></h3></section></summary><div class="impl-items"><section id="method.clear-6" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#83-85">source</a><a href="#method.clear-6" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Clear-for-RwLock%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#88-93">source</a><a href="#impl-Clear-for-RwLock%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a>> <a class="trait" href="trait.Clear.html" title="trait sharded_slab::Clear">Clear</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/std/sync/rwlock/struct.RwLock.html" title="struct std::sync::rwlock::RwLock">RwLock</a><T></h3></section></summary><div class="impl-items"><section id="method.clear-7" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/clear.rs.html#90-92">source</a><a href="#method.clear-7" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.clear" class="fn">clear</a>(&mut self)</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/sharded_slab/clear/trait.Clear.js" data-ignore-extern-crates="alloc,core,std" async></script></section></div></main></body></html>
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