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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="Opt-in mutable access to `Entry` keys."><title>MutableEntryKey in indexmap::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="indexmap" 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 trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../indexmap/index.html">indexmap</a><span class="version">2.7.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Mutable<wbr>Entry<wbr>Key</a></h2><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Key" title="Key">Key</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.key_mut" title="key_mut">key_mut</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In indexmap::<wbr>map</a></h2></div></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"><span class="rustdoc-breadcrumbs"><a href="../index.html">indexmap</a>::<wbr><a href="index.html">map</a></span><h1>Trait <span class="trait">MutableEntryKey</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/indexmap/map/mutable.rs.html#107-113">source</a> </span></div><pre class="rust item-decl"><code>pub trait MutableEntryKey: Sealed {
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type <a href="#associatedtype.Key" class="associatedtype">Key</a>;
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// Required method
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fn <a href="#tymethod.key_mut" class="fn">key_mut</a>(&mut self) -> &mut Self::<a class="associatedtype" href="trait.MutableEntryKey.html#associatedtype.Key" title="type indexmap::map::MutableEntryKey::Key">Key</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>Opt-in mutable access to <a href="enum.Entry.html" title="enum indexmap::map::Entry"><code>Entry</code></a> keys.</p>
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<p>These methods expose <code>&mut K</code>, mutable references to the key as it is stored
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in the map.
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You are allowed to modify the keys in the map <strong>if the modification
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does not change the key’s hash and equality</strong>.</p>
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<p>If keys are modified erroneously, you can no longer look them up.
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This is sound (memory safe) but a logical error hazard (just like
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implementing <code>PartialEq</code>, <code>Eq</code>, or <code>Hash</code> incorrectly would be).</p>
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<p><code>use</code> this trait to enable its methods for <code>Entry</code>.</p>
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<p>This trait is sealed and cannot be implemented for types outside this crate.</p>
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</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><section id="associatedtype.Key" class="method"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#108">source</a><h4 class="code-header">type <a href="#associatedtype.Key" class="associatedtype">Key</a></h4></section></div><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.key_mut" class="method"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#112">source</a><h4 class="code-header">fn <a href="#tymethod.key_mut" class="fn">key_mut</a>(&mut self) -> &mut Self::<a class="associatedtype" href="trait.MutableEntryKey.html#associatedtype.Key" title="type indexmap::map::MutableEntryKey::Key">Key</a></h4></section></summary><div class="docblock"><p>Gets a mutable reference to the entry’s key, either within the map if occupied,
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or else the new key that was used to find the entry.</p>
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</div></details></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><details class="toggle implementors-toggle"><summary><section id="impl-MutableEntryKey-for-Entry%3C'_,+K,+V%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#118-126">source</a><a href="#impl-MutableEntryKey-for-Entry%3C'_,+K,+V%3E" class="anchor">§</a><h3 class="code-header">impl<K, V> <a class="trait" href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey">MutableEntryKey</a> for <a class="enum" href="enum.Entry.html" title="enum indexmap::map::Entry">Entry</a><'_, K, V></h3></section></summary><div class="docblock"><p>Opt-in mutable access to <a href="enum.Entry.html" title="enum indexmap::map::Entry"><code>Entry</code></a> keys.</p>
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<p>See <a href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey"><code>MutableEntryKey</code></a> for more information.</p>
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</div><div class="impl-items"><section id="associatedtype.Key-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#119">source</a><a href="#associatedtype.Key-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Key" class="associatedtype">Key</a> = K</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MutableEntryKey-for-IndexedEntry%3C'_,+K,+V%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#151-156">source</a><a href="#impl-MutableEntryKey-for-IndexedEntry%3C'_,+K,+V%3E" class="anchor">§</a><h3 class="code-header">impl<K, V> <a class="trait" href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey">MutableEntryKey</a> for <a class="struct" href="struct.IndexedEntry.html" title="struct indexmap::map::IndexedEntry">IndexedEntry</a><'_, K, V></h3></section></summary><div class="docblock"><p>Opt-in mutable access to <a href="struct.IndexedEntry.html" title="struct indexmap::map::IndexedEntry"><code>IndexedEntry</code></a> keys.</p>
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<p>See <a href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey"><code>MutableEntryKey</code></a> for more information.</p>
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</div><div class="impl-items"><section id="associatedtype.Key-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#152">source</a><a href="#associatedtype.Key-2" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Key" class="associatedtype">Key</a> = K</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MutableEntryKey-for-OccupiedEntry%3C'_,+K,+V%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#131-136">source</a><a href="#impl-MutableEntryKey-for-OccupiedEntry%3C'_,+K,+V%3E" class="anchor">§</a><h3 class="code-header">impl<K, V> <a class="trait" href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey">MutableEntryKey</a> for <a class="struct" href="struct.OccupiedEntry.html" title="struct indexmap::map::OccupiedEntry">OccupiedEntry</a><'_, K, V></h3></section></summary><div class="docblock"><p>Opt-in mutable access to <a href="struct.OccupiedEntry.html" title="struct indexmap::map::OccupiedEntry"><code>OccupiedEntry</code></a> keys.</p>
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<p>See <a href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey"><code>MutableEntryKey</code></a> for more information.</p>
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</div><div class="impl-items"><section id="associatedtype.Key-3" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#132">source</a><a href="#associatedtype.Key-3" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Key" class="associatedtype">Key</a> = K</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-MutableEntryKey-for-VacantEntry%3C'_,+K,+V%3E" class="impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#141-146">source</a><a href="#impl-MutableEntryKey-for-VacantEntry%3C'_,+K,+V%3E" class="anchor">§</a><h3 class="code-header">impl<K, V> <a class="trait" href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey">MutableEntryKey</a> for <a class="struct" href="struct.VacantEntry.html" title="struct indexmap::map::VacantEntry">VacantEntry</a><'_, K, V></h3></section></summary><div class="docblock"><p>Opt-in mutable access to <a href="struct.VacantEntry.html" title="struct indexmap::map::VacantEntry"><code>VacantEntry</code></a> keys.</p>
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<p>See <a href="trait.MutableEntryKey.html" title="trait indexmap::map::MutableEntryKey"><code>MutableEntryKey</code></a> for more information.</p>
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</div><div class="impl-items"><section id="associatedtype.Key-4" class="associatedtype trait-impl"><a class="src rightside" href="../../src/indexmap/map/mutable.rs.html#142">source</a><a href="#associatedtype.Key-4" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Key" class="associatedtype">Key</a> = K</h4></section></div></details></div><script src="../../trait.impl/indexmap/map/mutable/trait.MutableEntryKey.js" async></script></section></div></main></body></html>
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