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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 sharded slab."><title>Slab in sharded_slab - Rust</title><script> if (window.location.protocol !== "file:") document.write(`<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">`)</script><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-e935ef01ae1c1829.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="1.78.0 (9b00956e5 2024-04-29)" data-channel="1.78.0" data-search-js="search-42d8da7a6b9792c2.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-4c98445ec4002617.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-12cf3b4f4f9dc36d.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-04d5337699b92874.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 struct"><!--[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" title="show sidebar"></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="#">Slab</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Associated Constants</a></h3><ul class="block associatedconstant"><li><a href="#associatedconstant.USED_BITS">USED_BITS</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.contains">contains</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_owned">get_owned</a></li><li><a href="#method.insert">insert</a></li><li><a href="#method.new">new</a></li><li><a href="#method.new_with_config">new_with_config</a></li><li><a href="#method.remove">remove</a></li><li><a href="#method.take">take</a></li><li><a href="#method.unique_iter">unique_iter</a></li><li><a href="#method.vacant_entry">vacant_entry</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-Slab%3CT,+C%3E">Debug</a></li><li><a href="#impl-Default-for-Slab%3CT%3E">Default</a></li><li><a href="#impl-Send-for-Slab%3CT,+C%3E">Send</a></li><li><a href="#impl-Sync-for-Slab%3CT,+C%3E">Sync</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-Slab%3CT,+C%3E">!Freeze</a></li><li><a href="#impl-UnwindSafe-for-Slab%3CT,+C%3E">!UnwindSafe</a></li><li><a href="#impl-RefUnwindSafe-for-Slab%3CT,+C%3E">RefUnwindSafe</a></li><li><a href="#impl-Unpin-for-Slab%3CT,+C%3E">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow&lt;T&gt;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&lt;T&gt;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&lt;T&gt;</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into&lt;U&gt;</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom&lt;U&gt;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto&lt;U&gt;</a></li></ul></section><h2><a href="index.html">In crate sharded_slab</a></h2></div></nav><div class="sidebar-resizer"></div>
<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>Struct <a href="index.html">sharded_slab</a>::<wbr><a class="struct" href="#">Slab</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/lib.rs.html#235-238">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct Slab&lt;T, C: <a class="trait" href="trait.Config.html" title="trait sharded_slab::Config">Config</a> = <a class="struct" href="struct.DefaultConfig.html" title="struct sharded_slab::DefaultConfig">DefaultConfig</a>&gt; { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A sharded slab.</p>
<p>See the <a href="index.html" title="mod sharded_slab">crate-level documentation</a> for details on using this type.</p>
</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Slab%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#375-389">source</a><a href="#impl-Slab%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#377-379">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -&gt; Self</h4></section></summary><div class="docblock"><p>Returns a new slab with the default configuration parameters.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.new_with_config" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#382-388">source</a><h4 class="code-header">pub fn <a href="#method.new_with_config" class="fn">new_with_config</a>&lt;C: <a class="trait" href="trait.Config.html" title="trait sharded_slab::Config">Config</a>&gt;() -&gt; <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h4></section></summary><div class="docblock"><p>Returns a new slab with the provided configuration parameters.</p>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Slab%3CT,+C%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#391-763">source</a><a href="#impl-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, C: <a class="trait" href="trait.Config.html" title="trait sharded_slab::Config">Config</a>&gt; <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedconstant.USED_BITS" class="associatedconstant"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#403">source</a><h4 class="code-header">pub const <a href="#associatedconstant.USED_BITS" class="constant">USED_BITS</a>: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a> = C::USED_BITS</h4></section></summary><div class="docblock"><p>The number of bits in each index which are used by the slab.</p>
<p>If other data is packed into the <code>usize</code> indices returned by
<a href="struct.Slab.html#method.insert" title="method sharded_slab::Slab::insert"><code>Slab::insert</code></a>, user code is free to use any bits higher than the
<code>USED_BITS</code>-th bit freely.</p>
<p>This is determined by the <a href="trait.Config.html" title="trait sharded_slab::Config"><code>Config</code></a> type that configures the slab’s
parameters. By default, all bits are used; this can be changed by
overriding the <a href="trait.Config.html#RESERVED_BITS" title="trait sharded_slab::Config"><code>Config::RESERVED_BITS</code></a> constant.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#420-430">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(&amp;self, value: T) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a>&gt;</h4></section></summary><div class="docblock"><p>Inserts a value into the slab, returning the integer index at which that
value was inserted. This index can then be used to access the entry.</p>
<p>If this function returns <code>None</code>, then the shard for the current thread
is full and no items can be added until some are removed, or the maximum
number of shards has been reached.</p>
<h5 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slab = Slab::new();
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="macro">assert_eq!</span>(slab.get(key).unwrap(), <span class="string">"hello world"</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.vacant_entry" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#455-467">source</a><h4 class="code-header">pub fn <a href="#method.vacant_entry" class="fn">vacant_entry</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.VacantEntry.html" title="struct sharded_slab::VacantEntry">VacantEntry</a>&lt;'_, T, C&gt;&gt;</h4></section></summary><div class="docblock"><p>Return a handle to a vacant entry allowing for further manipulation.</p>
<p>This function is useful when creating values that must contain their
slab index. The returned <a href="struct.VacantEntry.html" title="struct sharded_slab::VacantEntry"><code>VacantEntry</code></a> reserves a slot in the slab and
is able to return the index of the entry.</p>
<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slab = Slab::new();
<span class="kw">let </span>hello = {
<span class="kw">let </span>entry = slab.vacant_entry().unwrap();
<span class="kw">let </span>key = entry.key();
entry.insert((key, <span class="string">"hello"</span>));
key
};
<span class="macro">assert_eq!</span>(hello, slab.get(hello).unwrap().<span class="number">0</span>);
<span class="macro">assert_eq!</span>(<span class="string">"hello"</span>, slab.get(hello).unwrap().<span class="number">1</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.remove" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#512-525">source</a><h4 class="code-header">pub fn <a href="#method.remove" class="fn">remove</a>(&amp;self, idx: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Remove the value at the given index in the slab, returning <code>true</code> if a
value was removed.</p>
<p>Unlike <a href="struct.Slab.html#method.take" title="method sharded_slab::Slab::take"><code>take</code></a>, this method does <em>not</em> block the current thread until
the value can be removed. Instead, if another thread is currently
accessing that value, this marks it to be removed by that thread when it
finishes accessing the value.</p>
<h5 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slab = sharded_slab::Slab::new();
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="comment">// Remove the item from the slab.
</span><span class="macro">assert!</span>(slab.remove(key));
<span class="comment">// Now, the slot is empty.
</span><span class="macro">assert!</span>(!slab.contains(key));</code></pre></div>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Arc;
<span class="kw">let </span>slab = Arc::new(sharded_slab::Slab::new());
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="kw">let </span>slab2 = slab.clone();
<span class="kw">let </span>thread2 = std::thread::spawn(<span class="kw">move </span>|| {
<span class="comment">// Depending on when this thread begins executing, the item may
// or may not have already been removed...
</span><span class="kw">if let </span><span class="prelude-val">Some</span>(item) = slab2.get(key) {
<span class="macro">assert_eq!</span>(item, <span class="string">"hello world"</span>);
}
});
<span class="comment">// The item will be removed by thread2 when it finishes accessing it.
</span><span class="macro">assert!</span>(slab.remove(key));
thread2.join().unwrap();
<span class="macro">assert!</span>(!slab.contains(key));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#581-591">source</a><h4 class="code-header">pub fn <a href="#method.take" class="fn">take</a>(&amp;self, idx: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;</h4></section></summary><div class="docblock"><p>Removes the value associated with the given key from the slab, returning
it.</p>
<p>If the slab does not contain a value for that key, <code>None</code> is returned
instead.</p>
<p>If the value associated with the given key is currently being
accessed by another thread, this method will block the current thread
until the item is no longer accessed. If this is not desired, use
<a href="struct.Slab.html#method.remove" title="method sharded_slab::Slab::remove"><code>remove</code></a> instead.</p>
<p><strong>Note</strong>: This method blocks the calling thread by spinning until the
currently outstanding references are released. Spinning for long periods
of time can result in high CPU time and power consumption. Therefore,
<code>take</code> should only be called when other references to the slot are
expected to be dropped soon (e.g., when all accesses are relatively
short).</p>
<h5 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slab = sharded_slab::Slab::new();
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="comment">// Remove the item from the slab, returning it.
</span><span class="macro">assert_eq!</span>(slab.take(key), <span class="prelude-val">Some</span>(<span class="string">"hello world"</span>));
<span class="comment">// Now, the slot is empty.
</span><span class="macro">assert!</span>(!slab.contains(key));</code></pre></div>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Arc;
<span class="kw">let </span>slab = Arc::new(sharded_slab::Slab::new());
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="kw">let </span>slab2 = slab.clone();
<span class="kw">let </span>thread2 = std::thread::spawn(<span class="kw">move </span>|| {
<span class="comment">// Depending on when this thread begins executing, the item may
// or may not have already been removed...
</span><span class="kw">if let </span><span class="prelude-val">Some</span>(item) = slab2.get(key) {
<span class="macro">assert_eq!</span>(item, <span class="string">"hello world"</span>);
}
});
<span class="comment">// The item will only be removed when the other thread finishes
// accessing it.
</span><span class="macro">assert_eq!</span>(slab.take(key), <span class="prelude-val">Some</span>(<span class="string">"hello world"</span>));
thread2.join().unwrap();
<span class="macro">assert!</span>(!slab.contains(key));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#608-623">source</a><h4 class="code-header">pub fn <a href="#method.get" class="fn">get</a>(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.Entry.html" title="struct sharded_slab::Entry">Entry</a>&lt;'_, T, C&gt;&gt;</h4></section></summary><div class="docblock"><p>Return a reference to the value associated with the given key.</p>
<p>If the slab does not contain a value for the given key, or if the
maximum number of concurrent references to the slot has been reached,
<code>None</code> is returned instead.</p>
<h5 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slab = sharded_slab::Slab::new();
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="macro">assert_eq!</span>(slab.get(key).unwrap(), <span class="string">"hello world"</span>);
<span class="macro">assert!</span>(slab.get(<span class="number">12345</span>).is_none());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_owned" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#706-721">source</a><h4 class="code-header">pub fn <a href="#method.get_owned" class="fn">get_owned</a>(self: <a class="struct" href="https://doc.rust-lang.org/1.78.0/alloc/sync/struct.Arc.html" title="struct alloc::sync::Arc">Arc</a>&lt;Self&gt;, key: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.OwnedEntry.html" title="struct sharded_slab::OwnedEntry">OwnedEntry</a>&lt;T, C&gt;&gt;</h4></section></summary><div class="docblock"><p>Return an owned reference to the value at the given index.</p>
<p>If the slab does not contain a value for the given key, <code>None</code> is
returned instead.</p>
<p>Unlike <a href="struct.Slab.html#method.get" title="method sharded_slab::Slab::get"><code>get</code></a>, which borrows the slab, this method <em>clones</em> the <a href="https://doc.rust-lang.org/1.78.0/alloc/sync/struct.Arc.html" title="struct alloc::sync::Arc"><code>Arc</code></a>
around the slab. This means that the returned <a href="struct.OwnedEntry.html" title="struct sharded_slab::OwnedEntry"><code>OwnedEntry</code></a> can be held
for an arbitrary lifetime. However, this method requires that the slab
itself be wrapped in an <code>Arc</code>.</p>
<h5 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::sync::Arc;
<span class="kw">let </span>slab: Arc&lt;Slab&lt;<span class="kw-2">&amp;</span><span class="lifetime">'static </span>str&gt;&gt; = Arc::new(Slab::new());
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="comment">// Look up the created key, returning an `OwnedEntry`.
</span><span class="kw">let </span>value = slab.clone().get_owned(key).unwrap();
<span class="comment">// Now, the original `Arc` clone of the slab may be dropped, but the
// returned `OwnedEntry` can still access the value.
</span><span class="macro">assert_eq!</span>(value, <span class="string">"hello world"</span>);</code></pre></div>
<p>Unlike <a href="struct.Entry.html" title="struct sharded_slab::Entry"><code>Entry</code></a>, an <code>OwnedEntry</code> may be stored in a struct which must live
for the <code>'static</code> lifetime:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>sharded_slab::OwnedEntry;
<span class="kw">use </span>std::sync::Arc;
<span class="kw">pub struct </span>MyStruct {
entry: OwnedEntry&lt;<span class="kw-2">&amp;</span><span class="lifetime">'static </span>str&gt;,
<span class="comment">// ... other fields ...
</span>}
<span class="comment">// Suppose this is some arbitrary function which requires a value that
// lives for the 'static lifetime...
</span><span class="kw">fn </span>function_requiring_static&lt;T: <span class="lifetime">'static</span>&gt;(t: <span class="kw-2">&amp;</span>T) {
<span class="comment">// ... do something extremely important and interesting ...
</span>}
<span class="kw">let </span>slab: Arc&lt;Slab&lt;<span class="kw-2">&amp;</span><span class="lifetime">'static </span>str&gt;&gt; = Arc::new(Slab::new());
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="comment">// Look up the created key, returning an `OwnedEntry`.
</span><span class="kw">let </span>entry = slab.clone().get_owned(key).unwrap();
<span class="kw">let </span>my_struct = MyStruct {
entry,
<span class="comment">// ...
</span>};
<span class="comment">// We can use `my_struct` anywhere where it is required to have the
// `'static` lifetime:
</span>function_requiring_static(<span class="kw-2">&amp;</span>my_struct);</code></pre></div>
<p><a href="struct.OwnedEntry.html" title="struct sharded_slab::OwnedEntry"><code>OwnedEntry</code></a>s may be sent between threads:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::{thread, sync::Arc};
<span class="kw">let </span>slab: Arc&lt;Slab&lt;<span class="kw-2">&amp;</span><span class="lifetime">'static </span>str&gt;&gt; = Arc::new(Slab::new());
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="comment">// Look up the created key, returning an `OwnedEntry`.
</span><span class="kw">let </span>value = slab.clone().get_owned(key).unwrap();
thread::spawn(<span class="kw">move </span>|| {
<span class="macro">assert_eq!</span>(value, <span class="string">"hello world"</span>);
<span class="comment">// ...
</span>}).join().unwrap();</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.contains" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#736-738">source</a><h4 class="code-header">pub fn <a href="#method.contains" class="fn">contains</a>(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the slab contains a value for the given key.</p>
<h5 id="examples-6"><a class="doc-anchor" href="#examples-6">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slab = sharded_slab::Slab::new();
<span class="kw">let </span>key = slab.insert(<span class="string">"hello world"</span>).unwrap();
<span class="macro">assert!</span>(slab.contains(key));
slab.take(key).unwrap();
<span class="macro">assert!</span>(!slab.contains(key));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.unique_iter" class="method"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#745-762">source</a><h4 class="code-header">pub fn <a href="#method.unique_iter" class="fn">unique_iter</a>(&amp;mut self) -&gt; <a class="struct" href="struct.UniqueIter.html" title="struct sharded_slab::UniqueIter">UniqueIter</a>&lt;'_, T, C&gt; <a href="#" class="tooltip" data-notable-ty="UniqueIter&lt;&#39;_, T, C&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Returns an iterator over all the items in the slab.</p>
<p>Because this iterator exclusively borrows the slab (i.e. it holds an
<code>&amp;mut Slab&lt;T&gt;</code>), elements will not be added or removed while the
iteration is in progress.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-Slab%3CT,+C%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#771-778">source</a><a href="#impl-Debug-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, C: <a class="trait" href="trait.Config.html" title="trait sharded_slab::Config">Config</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#772-777">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.78.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.78.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.78.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-Slab%3CT%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#765-769">source</a><a href="#impl-Default-for-Slab%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#766-768">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -&gt; Self</h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.78.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><section id="impl-Send-for-Slab%3CT,+C%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#780">source</a><a href="#impl-Send-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, C: <a class="trait" href="trait.Config.html" title="trait sharded_slab::Config">Config</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h3></section><section id="impl-Sync-for-Slab%3CT,+C%3E" class="impl"><a class="src rightside" href="../src/sharded_slab/lib.rs.html#781">source</a><a href="#impl-Sync-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>, C: <a class="trait" href="trait.Config.html" title="trait sharded_slab::Config">Config</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-Slab%3CT,+C%3E" class="impl"><a href="#impl-Freeze-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, C = <a class="struct" href="struct.DefaultConfig.html" title="struct sharded_slab::DefaultConfig">DefaultConfig</a>&gt; !<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h3></section><section id="impl-RefUnwindSafe-for-Slab%3CT,+C%3E" class="impl"><a href="#impl-RefUnwindSafe-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, C&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;<div class="where">where
C: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Unpin-for-Slab%3CT,+C%3E" class="impl"><a href="#impl-Unpin-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, C&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;<div class="where">where
C: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-Slab%3CT,+C%3E" class="impl"><a href="#impl-UnwindSafe-for-Slab%3CT,+C%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T, C = <a class="struct" href="struct.DefaultConfig.html" title="struct sharded_slab::DefaultConfig">DefaultConfig</a>&gt; !<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Slab.html" title="struct sharded_slab::Slab">Slab</a>&lt;T, C&gt;</h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.78.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.78.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.78.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.78.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.78.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; 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/1.78.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.78.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.78.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.78.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div><script type="text/json" id="notable-traits-data">{"UniqueIter<'_, T, C>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.UniqueIter.html\" title=\"struct sharded_slab::UniqueIter\">UniqueIter</a>&lt;'a, T, C&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T, C: <a class=\"trait\" href=\"trait.Config.html\" title=\"trait sharded_slab::Config\">Config</a>&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.UniqueIter.html\" title=\"struct sharded_slab::UniqueIter\">UniqueIter</a>&lt;'a, T, C&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.78.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.78.0/std/primitive.reference.html\">&amp;'a T</a>;</div>"}</script></section></div></main></body></html>
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