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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 view into a single entry in a map, which may either be vacant or occupied."><title>RawEntryMut in hashbrown::hash_map - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-b0742ba02757f159.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="hashbrown" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0 (90b35a623 2024-11-26)" data-channel="1.83.0" data-search-js="search-f0d225181b97f9a4.js" data-settings-js="settings-805db61a62df4bd2.js" ><script src="../../static.files/storage-1d39b6787ed640ff.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-f070b9041d14864c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-0111fcff984fae8f.css"></noscript><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 enum"><!--[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="../../hashbrown/index.html">hashbrown</a><span class="version">0.12.3</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">RawEntry<wbr>Mut</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#variants">Variants</a></h3><ul class="block variant"><li><a href="#variant.Occupied" title="Occupied">Occupied</a></li><li><a href="#variant.Vacant" title="Vacant">Vacant</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.and_modify" title="and_modify">and_modify</a></li><li><a href="#method.and_replace_entry_with" title="and_replace_entry_with">and_replace_entry_with</a></li><li><a href="#method.insert" title="insert">insert</a></li><li><a href="#method.or_insert" title="or_insert">or_insert</a></li><li><a href="#method.or_insert_with" title="or_insert_with">or_insert_with</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Debug-for-RawEntryMut%3C'_,+K,+V,+S,+A%3E" title="Debug">Debug</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-UnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" title="!UnwindSafe">!UnwindSafe</a></li><li><a href="#impl-Freeze-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" title="Freeze">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" title="RefUnwindSafe">RefUnwindSafe</a></li><li><a href="#impl-Send-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" title="Send">Send</a></li><li><a href="#impl-Sync-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" title="Sync">Sync</a></li><li><a href="#impl-Unpin-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" title="Unpin">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a
Occupied(<a class="struct" href="struct.RawOccupiedEntryMut.html" title="struct hashbrown::hash_map::RawOccupiedEntryMut">RawOccupiedEntryMut</a>&lt;'a, K, V, S, A&gt;),
Vacant(<a class="struct" href="struct.RawVacantEntryMut.html" title="struct hashbrown::hash_map::RawVacantEntryMut">RawVacantEntryMut</a>&lt;'a, K, V, S, A&gt;),
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A view into a single entry in a map, which may either be vacant or occupied.</p>
<p>This is a lower-level version of <a href="enum.Entry.html"><code>Entry</code></a>.</p>
<p>This <code>enum</code> is constructed through the <a href="struct.HashMap.html#method.raw_entry_mut"><code>raw_entry_mut</code></a> method on <a href="struct.HashMap.html"><code>HashMap</code></a>,
then calling one of the methods of that <a href="struct.RawEntryBuilderMut.html"><code>RawEntryBuilderMut</code></a>.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>core::hash::{BuildHasher, Hash};
<span class="kw">use </span>hashbrown::hash_map::{HashMap, RawEntryMut, RawOccupiedEntryMut};
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
map.extend([(<span class="string">'a'</span>, <span class="number">1</span>), (<span class="string">'b'</span>, <span class="number">2</span>), (<span class="string">'c'</span>, <span class="number">3</span>)]);
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
<span class="kw">fn </span>compute_hash&lt;K: Hash + <span class="question-mark">?</span>Sized, S: BuildHasher&gt;(hash_builder: <span class="kw-2">&amp;</span>S, key: <span class="kw-2">&amp;</span>K) -&gt; u64 {
<span class="kw">use </span>core::hash::Hasher;
<span class="kw">let </span><span class="kw-2">mut </span>state = hash_builder.build_hasher();
key.hash(<span class="kw-2">&amp;mut </span>state);
state.finish()
}
<span class="comment">// Existing key (insert)
</span><span class="kw">let </span>raw: RawEntryMut&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>&gt; = map.raw_entry_mut().from_key(<span class="kw-2">&amp;</span><span class="string">'a'</span>);
<span class="kw">let </span>_raw_o: RawOccupiedEntryMut&lt;<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>&gt; = raw.insert(<span class="string">'a'</span>, <span class="number">10</span>);
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
<span class="comment">// Nonexistent key (insert)
</span>map.raw_entry_mut().from_key(<span class="kw-2">&amp;</span><span class="string">'d'</span>).insert(<span class="string">'d'</span>, <span class="number">40</span>);
<span class="macro">assert_eq!</span>(map.len(), <span class="number">4</span>);
<span class="comment">// Existing key (or_insert)
</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&amp;</span><span class="string">'b'</span>);
<span class="kw">let </span>kv = map
.raw_entry_mut()
.from_key_hashed_nocheck(hash, <span class="kw-2">&amp;</span><span class="string">'b'</span>)
.or_insert(<span class="string">'b'</span>, <span class="number">20</span>);
<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&amp;mut </span><span class="string">'b'</span>, <span class="kw-2">&amp;mut </span><span class="number">2</span>));
<span class="kw-2">*</span>kv.<span class="number">1 </span>= <span class="number">20</span>;
<span class="macro">assert_eq!</span>(map.len(), <span class="number">4</span>);
<span class="comment">// Nonexistent key (or_insert)
</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&amp;</span><span class="string">'e'</span>);
<span class="kw">let </span>kv = map
.raw_entry_mut()
.from_key_hashed_nocheck(hash, <span class="kw-2">&amp;</span><span class="string">'e'</span>)
.or_insert(<span class="string">'e'</span>, <span class="number">50</span>);
<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&amp;mut </span><span class="string">'e'</span>, <span class="kw-2">&amp;mut </span><span class="number">50</span>));
<span class="macro">assert_eq!</span>(map.len(), <span class="number">5</span>);
<span class="comment">// Existing key (or_insert_with)
</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&amp;</span><span class="string">'c'</span>);
<span class="kw">let </span>kv = map
.raw_entry_mut()
.from_hash(hash, |q| q == <span class="kw-2">&amp;</span><span class="string">'c'</span>)
.or_insert_with(|| (<span class="string">'c'</span>, <span class="number">30</span>));
<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&amp;mut </span><span class="string">'c'</span>, <span class="kw-2">&amp;mut </span><span class="number">3</span>));
<span class="kw-2">*</span>kv.<span class="number">1 </span>= <span class="number">30</span>;
<span class="macro">assert_eq!</span>(map.len(), <span class="number">5</span>);
<span class="comment">// Nonexistent key (or_insert_with)
</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&amp;</span><span class="string">'f'</span>);
<span class="kw">let </span>kv = map
.raw_entry_mut()
.from_hash(hash, |q| q == <span class="kw-2">&amp;</span><span class="string">'f'</span>)
.or_insert_with(|| (<span class="string">'f'</span>, <span class="number">60</span>));
<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&amp;mut </span><span class="string">'f'</span>, <span class="kw-2">&amp;mut </span><span class="number">60</span>));
<span class="macro">assert_eq!</span>(map.len(), <span class="number">6</span>);
<span class="macro">println!</span>(<span class="string">"Our HashMap: {:?}"</span>, map);
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec&lt;<span class="kw">_</span>&gt; = map.iter().map(|(<span class="kw-2">&amp;</span>k, <span class="kw-2">&amp;</span>v)| (k, v)).collect();
<span class="comment">// The `Iter` iterator produces items in arbitrary order, so the
// items must be sorted to test them against a sorted array.
</span>vec.sort_unstable();
<span class="macro">assert_eq!</span>(vec, [(<span class="string">'a'</span>, <span class="number">10</span>), (<span class="string">'b'</span>, <span class="number">20</span>), (<span class="string">'c'</span>, <span class="number">30</span>), (<span class="string">'d'</span>, <span class="number">40</span>), (<span class="string">'e'</span>, <span class="number">50</span>), (<span class="string">'f'</span>, <span class="number">60</span>)]);</code></pre></div>
</div></details><h2 id="variants" class="variants section-header">Variants<a href="#variants" class="anchor">§</a></h2><div class="variants"><section id="variant.Occupied" class="variant"><a href="#variant.Occupied" class="anchor">§</a><h3 class="code-header">Occupied(<a class="struct" href="struct.RawOccupiedEntryMut.html" title="struct hashbrown::hash_map::RawOccupiedEntryMut">RawOccupiedEntryMut</a>&lt;'a, K, V, S, A&gt;)</h3></section><div class="docblock"><p>An occupied entry.</p>
<h4 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::{hash_map::RawEntryMut, HashMap};
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw">_</span>, <span class="kw">_</span>&gt; = [(<span class="string">"a"</span>, <span class="number">100</span>), (<span class="string">"b"</span>, <span class="number">200</span>)].into();
<span class="kw">match </span>map.raw_entry_mut().from_key(<span class="kw-2">&amp;</span><span class="string">"a"</span>) {
RawEntryMut::Vacant(<span class="kw">_</span>) =&gt; <span class="macro">unreachable!</span>(),
RawEntryMut::Occupied(<span class="kw">_</span>) =&gt; { }
}</code></pre></div>
</div><section id="variant.Vacant" class="variant"><a href="#variant.Vacant" class="anchor">§</a><h3 class="code-header">Vacant(<a class="struct" href="struct.RawVacantEntryMut.html" title="struct hashbrown::hash_map::RawVacantEntryMut">RawVacantEntryMut</a>&lt;'a, K, V, S, A&gt;)</h3></section><div class="docblock"><p>A vacant entry.</p>
<h4 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::{hash_map::RawEntryMut, HashMap};
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw-2">&amp;</span>str, i32&gt; = HashMap::new();
<span class="kw">match </span>map.raw_entry_mut().from_key(<span class="string">"a"</span>) {
RawEntryMut::Occupied(<span class="kw">_</span>) =&gt; <span class="macro">unreachable!</span>(),
RawEntryMut::Vacant(<span class="kw">_</span>) =&gt; { }
}</code></pre></div>
</div></div><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-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3292-3484">source</a><a href="#impl-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A: Allocator + <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3306-3318">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(self, key: K, value: V) -&gt; <a class="struct" href="struct.RawOccupiedEntryMut.html" title="struct hashbrown::hash_map::RawOccupiedEntryMut">RawOccupiedEntryMut</a>&lt;'a, K, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Sets the value of the entry, and returns a RawOccupiedEntryMut.</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">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw-2">&amp;</span>str, u32&gt; = HashMap::new();
<span class="kw">let </span>entry = map.raw_entry_mut().from_key(<span class="string">"horseyland"</span>).insert(<span class="string">"horseyland"</span>, <span class="number">37</span>);
<span class="macro">assert_eq!</span>(entry.remove_entry(), (<span class="string">"horseyland"</span>, <span class="number">37</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.or_insert" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3337-3346">source</a><h4 class="code-header">pub fn <a href="#method.or_insert" class="fn">or_insert</a>(self, default_key: K, default_val: V) -&gt; (<a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;'a mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;'a mut V</a>)<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Ensures a value is in the entry by inserting the default if empty, and returns
mutable references to the key and value in the entry.</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">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw-2">&amp;</span>str, u32&gt; = HashMap::new();
map.raw_entry_mut().from_key(<span class="string">"poneyland"</span>).or_insert(<span class="string">"poneyland"</span>, <span class="number">3</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">3</span>);
<span class="kw-2">*</span>map.raw_entry_mut().from_key(<span class="string">"poneyland"</span>).or_insert(<span class="string">"poneyland"</span>, <span class="number">10</span>).<span class="number">1 </span><span class="kw-2">*</span>= <span class="number">2</span>;
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">6</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.or_insert_with" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3365-3378">source</a><h4 class="code-header">pub fn <a href="#method.or_insert_with" class="fn">or_insert_with</a>&lt;F&gt;(self, default: F) -&gt; (<a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;'a mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;'a mut V</a>)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.tuple.html">(K, V)</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,</div></h4></section></summary><div class="docblock"><p>Ensures a value is in the entry by inserting the result of the default function if empty,
and returns mutable references to the key and value in the entry.</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>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw-2">&amp;</span>str, String&gt; = HashMap::new();
map.raw_entry_mut().from_key(<span class="string">"poneyland"</span>).or_insert_with(|| {
(<span class="string">"poneyland"</span>, <span class="string">"hoho"</span>.to_string())
});
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="string">"hoho"</span>.to_string());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.and_modify" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3403-3417">source</a><h4 class="code-header">pub fn <a href="#method.and_modify" class="fn">and_modify</a>&lt;F&gt;(self, f: F) -&gt; Self<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;mut V</a>),</div></h4></section></summary><div class="docblock"><p>Provides in-place mutable access to an occupied entry before any
potential inserts into the map.</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">use </span>hashbrown::HashMap;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw-2">&amp;</span>str, u32&gt; = HashMap::new();
map.raw_entry_mut()
.from_key(<span class="string">"poneyland"</span>)
.and_modify(|_k, v| { <span class="kw-2">*</span>v += <span class="number">1 </span>})
.or_insert(<span class="string">"poneyland"</span>, <span class="number">42</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">42</span>);
map.raw_entry_mut()
.from_key(<span class="string">"poneyland"</span>)
.and_modify(|_k, v| { <span class="kw-2">*</span>v += <span class="number">1 </span>})
.or_insert(<span class="string">"poneyland"</span>, <span class="number">0</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">43</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.and_replace_entry_with" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3475-3483">source</a><h4 class="code-header">pub fn <a href="#method.and_replace_entry_with" class="fn">and_replace_entry_with</a>&lt;F&gt;(self, f: F) -&gt; Self<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/primitive.reference.html">&amp;K</a>, V) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.83.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;V&gt;,</div></h4></section></summary><div class="docblock"><p>Provides shared access to the key and owned access to the value of
an occupied entry and allows to replace or remove it based on the
value of the returned option.</p>
<h5 id="examples-7"><a class="doc-anchor" href="#examples-7">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
<span class="kw">use </span>hashbrown::hash_map::RawEntryMut;
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap&lt;<span class="kw-2">&amp;</span>str, u32&gt; = HashMap::new();
<span class="kw">let </span>entry = map
.raw_entry_mut()
.from_key(<span class="string">"poneyland"</span>)
.and_replace_entry_with(|_k, _v| <span class="macro">panic!</span>());
<span class="kw">match </span>entry {
RawEntryMut::Vacant(<span class="kw">_</span>) =&gt; {},
RawEntryMut::Occupied(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(),
}
map.insert(<span class="string">"poneyland"</span>, <span class="number">42</span>);
<span class="kw">let </span>entry = map
.raw_entry_mut()
.from_key(<span class="string">"poneyland"</span>)
.and_replace_entry_with(|k, v| {
<span class="macro">assert_eq!</span>(k, <span class="kw-2">&amp;</span><span class="string">"poneyland"</span>);
<span class="macro">assert_eq!</span>(v, <span class="number">42</span>);
<span class="prelude-val">Some</span>(v + <span class="number">1</span>)
});
<span class="kw">match </span>entry {
RawEntryMut::Occupied(e) =&gt; {
<span class="macro">assert_eq!</span>(e.key(), <span class="kw-2">&amp;</span><span class="string">"poneyland"</span>);
<span class="macro">assert_eq!</span>(e.get(), <span class="kw-2">&amp;</span><span class="number">43</span>);
},
RawEntryMut::Vacant(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(),
}
<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">43</span>);
<span class="kw">let </span>entry = map
.raw_entry_mut()
.from_key(<span class="string">"poneyland"</span>)
.and_replace_entry_with(|_k, _v| <span class="prelude-val">None</span>);
<span class="kw">match </span>entry {
RawEntryMut::Vacant(<span class="kw">_</span>) =&gt; {},
RawEntryMut::Occupied(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(),
}
<span class="macro">assert!</span>(!map.contains_key(<span class="string">"poneyland"</span>));</code></pre></div>
</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-RawEntryMut%3C'_,+K,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4037-4044">source</a><a href="#impl-Debug-for-RawEntryMut%3C'_,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, V: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, S, A: Allocator + <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'_, K, V, S, A&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/hashbrown/map.rs.html#4038-4043">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.83.0/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/1.83.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.83.0/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/1.83.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details></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-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a href="#impl-Freeze-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&gt;</h3></section><section id="impl-RefUnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a href="#impl-RefUnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
A: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a href="#impl-Send-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
A: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a href="#impl-Sync-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
V: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
S: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
A: <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a href="#impl-Unpin-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A&gt; <a class="trait" href="https://doc.rust-lang.org/1.83.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&gt;</h3></section><section id="impl-UnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="impl"><a href="#impl-UnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, A = Global&gt; !<a class="trait" href="https://doc.rust-lang.org/1.83.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a>&lt;'a, K, V, S, A&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/1.83.0/src/core/any.rs.html#138">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/1.83.0/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/1.83.0/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/1.83.0/src/core/any.rs.html#139">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/src/core/borrow.rs.html#209">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/1.83.0/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/1.83.0/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/1.83.0/src/core/borrow.rs.html#211">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.83.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.83.0/core/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/1.83.0/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/1.83.0/src/core/borrow.rs.html#217">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/1.83.0/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/1.83.0/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/1.83.0/src/core/borrow.rs.html#218">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.83.0/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/1.83.0/core/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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 class="src rightside" href="https://doc.rust-lang.org/1.83.0/src/core/convert/mod.rs.html#809">source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.83.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/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 class="src rightside" href="https://doc.rust-lang.org/1.83.0/src/core/convert/mod.rs.html#794">source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.83.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.83.0/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/1.83.0/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/1.83.0/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/1.83.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.83.0/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/1.83.0/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/1.83.0/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></section></div></main></body></html>
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