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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-dd39b87e5fcfba68.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="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.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">0.14.5</span></h2></div><h2 class="location"><a href="#">RawEntryMut</a></h2><div class="sidebar-elems"><section><h3><a href="#variants">Variants</a></h3><ul class="block variant"><li><a href="#variant.Occupied">Occupied</a></li><li><a href="#variant.Vacant">Vacant</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.and_modify">and_modify</a></li><li><a href="#method.and_replace_entry_with">and_replace_entry_with</a></li><li><a href="#method.insert">insert</a></li><li><a href="#method.or_insert">or_insert</a></li><li><a href="#method.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">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">!UnwindSafe</a></li><li><a href="#impl-Freeze-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E">RefUnwindSafe</a></li><li><a href="#impl-Send-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E">Send</a></li><li><a href="#impl-Sync-for-RawEntryMut%3C'a,+K,+V,+S,+A%3E">Sync</a></li><li><a href="#impl-Unpin-for-RawEntryMut%3C'a,+K,+V,+S,+A%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<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li></ul></section><h2><a href="index.html">In hashbrown::hash_map</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Enum <a href="../index.html">hashbrown</a>::<wbr><a href="index.html">hash_map</a>::<wbr><a class="enum" href="#">RawEntryMut</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/hashbrown/map.rs.html#2942-2971">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub enum RawEntryMut<'a, K, V, S, A: Allocator = Global> {
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Occupied(<a class="struct" href="struct.RawOccupiedEntryMut.html" title="struct hashbrown::hash_map::RawOccupiedEntryMut">RawOccupiedEntryMut</a><'a, K, V, S, A>),
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Vacant(<a class="struct" href="struct.RawVacantEntryMut.html" title="struct hashbrown::hash_map::RawVacantEntryMut">RawVacantEntryMut</a><'a, K, V, S, A>),
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}</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>
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<p>This is a lower-level version of <a href="enum.Entry.html"><code>Entry</code></a>.</p>
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<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>,
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then calling one of the methods of that <a href="struct.RawEntryBuilderMut.html"><code>RawEntryBuilderMut</code></a>.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>core::hash::{BuildHasher, Hash};
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<span class="kw">use </span>hashbrown::hash_map::{HashMap, RawEntryMut, RawOccupiedEntryMut};
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<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
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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>)]);
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
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<span class="kw">fn </span>compute_hash<K: Hash + <span class="question-mark">?</span>Sized, S: BuildHasher>(hash_builder: <span class="kw-2">&</span>S, key: <span class="kw-2">&</span>K) -> u64 {
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<span class="kw">use </span>core::hash::Hasher;
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<span class="kw">let </span><span class="kw-2">mut </span>state = hash_builder.build_hasher();
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key.hash(<span class="kw-2">&mut </span>state);
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state.finish()
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}
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<span class="comment">// Existing key (insert)
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</span><span class="kw">let </span>raw: RawEntryMut<<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>> = map.raw_entry_mut().from_key(<span class="kw-2">&</span><span class="string">'a'</span>);
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<span class="kw">let </span>_raw_o: RawOccupiedEntryMut<<span class="kw">_</span>, <span class="kw">_</span>, <span class="kw">_</span>> = raw.insert(<span class="string">'a'</span>, <span class="number">10</span>);
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
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<span class="comment">// Nonexistent key (insert)
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</span>map.raw_entry_mut().from_key(<span class="kw-2">&</span><span class="string">'d'</span>).insert(<span class="string">'d'</span>, <span class="number">40</span>);
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">4</span>);
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<span class="comment">// Existing key (or_insert)
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</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&</span><span class="string">'b'</span>);
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<span class="kw">let </span>kv = map
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.raw_entry_mut()
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.from_key_hashed_nocheck(hash, <span class="kw-2">&</span><span class="string">'b'</span>)
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.or_insert(<span class="string">'b'</span>, <span class="number">20</span>);
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<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&mut </span><span class="string">'b'</span>, <span class="kw-2">&mut </span><span class="number">2</span>));
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<span class="kw-2">*</span>kv.<span class="number">1 </span>= <span class="number">20</span>;
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">4</span>);
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<span class="comment">// Nonexistent key (or_insert)
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</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&</span><span class="string">'e'</span>);
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<span class="kw">let </span>kv = map
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.raw_entry_mut()
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.from_key_hashed_nocheck(hash, <span class="kw-2">&</span><span class="string">'e'</span>)
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.or_insert(<span class="string">'e'</span>, <span class="number">50</span>);
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<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&mut </span><span class="string">'e'</span>, <span class="kw-2">&mut </span><span class="number">50</span>));
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">5</span>);
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<span class="comment">// Existing key (or_insert_with)
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</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&</span><span class="string">'c'</span>);
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<span class="kw">let </span>kv = map
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.raw_entry_mut()
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.from_hash(hash, |q| q == <span class="kw-2">&</span><span class="string">'c'</span>)
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.or_insert_with(|| (<span class="string">'c'</span>, <span class="number">30</span>));
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<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&mut </span><span class="string">'c'</span>, <span class="kw-2">&mut </span><span class="number">3</span>));
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<span class="kw-2">*</span>kv.<span class="number">1 </span>= <span class="number">30</span>;
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">5</span>);
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<span class="comment">// Nonexistent key (or_insert_with)
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</span><span class="kw">let </span>hash = compute_hash(map.hasher(), <span class="kw-2">&</span><span class="string">'f'</span>);
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<span class="kw">let </span>kv = map
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.raw_entry_mut()
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.from_hash(hash, |q| q == <span class="kw-2">&</span><span class="string">'f'</span>)
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.or_insert_with(|| (<span class="string">'f'</span>, <span class="number">60</span>));
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<span class="macro">assert_eq!</span>(kv, (<span class="kw-2">&mut </span><span class="string">'f'</span>, <span class="kw-2">&mut </span><span class="number">60</span>));
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<span class="macro">assert_eq!</span>(map.len(), <span class="number">6</span>);
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<span class="macro">println!</span>(<span class="string">"Our HashMap: {:?}"</span>, map);
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<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<<span class="kw">_</span>> = map.iter().map(|(<span class="kw-2">&</span>k, <span class="kw-2">&</span>v)| (k, v)).collect();
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<span class="comment">// The `Iter` iterator produces items in arbitrary order, so the
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// items must be sorted to test them against a sorted array.
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</span>vec.sort_unstable();
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<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>
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</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><'a, K, V, S, A>)</h3></section><div class="docblock"><p>An occupied entry.</p>
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<h4 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h4>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::{hash_map::RawEntryMut, HashMap};
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<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<<span class="kw">_</span>, <span class="kw">_</span>> = [(<span class="string">"a"</span>, <span class="number">100</span>), (<span class="string">"b"</span>, <span class="number">200</span>)].into();
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<span class="kw">match </span>map.raw_entry_mut().from_key(<span class="kw-2">&</span><span class="string">"a"</span>) {
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RawEntryMut::Vacant(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(),
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RawEntryMut::Occupied(<span class="kw">_</span>) => { }
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}</code></pre></div>
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</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><'a, K, V, S, A>)</h3></section><div class="docblock"><p>A vacant entry.</p>
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<h4 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h4>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::{hash_map::RawEntryMut, HashMap};
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<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<<span class="kw-2">&</span>str, i32> = HashMap::new();
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<span class="kw">match </span>map.raw_entry_mut().from_key(<span class="string">"a"</span>) {
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RawEntryMut::Occupied(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(),
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RawEntryMut::Vacant(<span class="kw">_</span>) => { }
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}</code></pre></div>
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</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#3348-3540">source</a><a href="#impl-RawEntryMut%3C'a,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<'a, K, V, S, A: Allocator> <a class="enum" href="enum.RawEntryMut.html" title="enum hashbrown::hash_map::RawEntryMut">RawEntryMut</a><'a, K, V, S, A></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#3362-3374">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(self, key: K, value: V) -> <a class="struct" href="struct.RawOccupiedEntryMut.html" title="struct hashbrown::hash_map::RawOccupiedEntryMut">RawOccupiedEntryMut</a><'a, K, V, S, A><div class="where">where
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K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
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S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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>
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<h5 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
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<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<<span class="kw-2">&</span>str, u32> = HashMap::new();
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<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>);
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<span class="macro">assert_eq!</span>(entry.remove_entry(), (<span class="string">"horseyland"</span>, <span class="number">37</span>));</code></pre></div>
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</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#3393-3402">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) -> (<a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&'a mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&'a mut V</a>)<div class="where">where
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K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
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S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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
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mutable references to the key and value in the entry.</p>
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<h5 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
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<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<<span class="kw-2">&</span>str, u32> = HashMap::new();
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map.raw_entry_mut().from_key(<span class="string">"poneyland"</span>).or_insert(<span class="string">"poneyland"</span>, <span class="number">3</span>);
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<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">3</span>);
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<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>;
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<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="number">6</span>);</code></pre></div>
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</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#3421-3434">source</a><h4 class="code-header">pub fn <a href="#method.or_insert_with" class="fn">or_insert_with</a><F>(self, default: F) -> (<a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&'a mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&'a mut V</a>)<div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.tuple.html">(K, V)</a>,
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K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
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S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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,
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and returns mutable references to the key and value in the entry.</p>
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<h5 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h5>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
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<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<<span class="kw-2">&</span>str, String> = HashMap::new();
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map.raw_entry_mut().from_key(<span class="string">"poneyland"</span>).or_insert_with(|| {
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(<span class="string">"poneyland"</span>, <span class="string">"hoho"</span>.to_string())
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});
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<span class="macro">assert_eq!</span>(map[<span class="string">"poneyland"</span>], <span class="string">"hoho"</span>.to_string());</code></pre></div>
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</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#3459-3473">source</a><h4 class="code-header">pub fn <a href="#method.and_modify" class="fn">and_modify</a><F>(self, f: F) -> Self<div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&mut K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&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>
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<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<<span class="kw-2">&</span>str, u32> = HashMap::new();
|
|
|
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map.raw_entry_mut()
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.from_key(<span class="string">"poneyland"</span>)
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.and_modify(|_k, v| { <span class="kw-2">*</span>v += <span class="number">1 </span>})
|
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.or_insert(<span class="string">"poneyland"</span>, <span class="number">42</span>);
|
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<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#3531-3539">source</a><h4 class="code-header">pub fn <a href="#method.and_replace_entry_with" class="fn">and_replace_entry_with</a><F>(self, f: F) -> Self<div class="where">where
|
|
F: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&K</a>, V) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><V>,</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;
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|
<span class="kw">use </span>hashbrown::hash_map::RawEntryMut;
|
|
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<<span class="kw-2">&</span>str, u32> = HashMap::new();
|
|
|
|
<span class="kw">let </span>entry = map
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.raw_entry_mut()
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.from_key(<span class="string">"poneyland"</span>)
|
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.and_replace_entry_with(|_k, _v| <span class="macro">panic!</span>());
|
|
|
|
<span class="kw">match </span>entry {
|
|
RawEntryMut::Vacant(<span class="kw">_</span>) => {},
|
|
RawEntryMut::Occupied(<span class="kw">_</span>) => <span class="macro">panic!</span>(),
|
|
}
|
|
|
|
map.insert(<span class="string">"poneyland"</span>, <span class="number">42</span>);
|
|
|
|
<span class="kw">let </span>entry = map
|
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.raw_entry_mut()
|
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.from_key(<span class="string">"poneyland"</span>)
|
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.and_replace_entry_with(|k, v| {
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|
<span class="macro">assert_eq!</span>(k, <span class="kw-2">&</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) => {
|
|
<span class="macro">assert_eq!</span>(e.key(), <span class="kw-2">&</span><span class="string">"poneyland"</span>);
|
|
<span class="macro">assert_eq!</span>(e.get(), <span class="kw-2">&</span><span class="number">43</span>);
|
|
},
|
|
RawEntryMut::Vacant(<span class="kw">_</span>) => <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>) => {},
|
|
RawEntryMut::Occupied(<span class="kw">_</span>) => <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#4093-4100">source</a><a href="#impl-Debug-for-RawEntryMut%3C'_,+K,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, V: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>, S, A: Allocator> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'_, K, V, S, A></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#4094-4099">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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<'a, K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'a, K, V, S, A></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<'a, K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'a, K, V, S, A><div class="where">where
|
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S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
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K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,
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V: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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<'a, K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'a, K, V, S, A><div class="where">where
|
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K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
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V: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
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S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
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A: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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<'a, K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'a, K, V, S, A><div class="where">where
|
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K: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.80.0/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<'a, K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'a, K, V, S, A></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<'a, K, V, S, A = Global> !<a class="trait" href="https://doc.rust-lang.org/1.80.0/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><'a, K, V, S, A></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/1.80.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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|
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
|
|
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.80.0/core/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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<T> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> 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/1.80.0/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<T, U> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
|
|
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</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/1.80.0/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/1.80.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
|
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<p>That is, this conversion is whatever the implementation of
|
|
<code><a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> 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/1.80.0/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<T, U> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</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/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></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/1.80.0/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<T, U> <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</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/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/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/1.80.0/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/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |