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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 hash map implemented with quadratic probing and SIMD lookup."><title>HashMap 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-492a78a4a87dcc01.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="1.82.0 (f6e511eec 2024-10-15)" data-channel="1.82.0" data-search-js="search-a99f1315e7cc5121.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-921df33f47b8780c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-3b12f09e550e0385.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 struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../hashbrown/index.html">hashbrown</a><span class="version">0.15.0</span></h2></div><h2 class="location"><a href="#">HashMap</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.allocation_size">allocation_size</a></li><li><a href="#method.allocator">allocator</a></li><li><a href="#method.capacity">capacity</a></li><li><a href="#method.clear">clear</a></li><li><a href="#method.contains_key">contains_key</a></li><li><a href="#method.drain">drain</a></li><li><a href="#method.entry">entry</a></li><li><a href="#method.entry_ref">entry_ref</a></li><li><a href="#method.extract_if">extract_if</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_key_value">get_key_value</a></li><li><a href="#method.get_key_value_mut">get_key_value_mut</a></li><li><a href="#method.get_many_key_value_mut">get_many_key_value_mut</a></li><li><a href="#method.get_many_key_value_unchecked_mut">get_many_key_value_unchecked_mut</a></li><li><a href="#method.get_many_mut">get_many_mut</a></li><li><a href="#method.get_many_unchecked_mut">get_many_unchecked_mut</a></li><li><a href="#method.get_mut">get_mut</a></li><li><a href="#method.hasher">hasher</a></li><li><a href="#method.insert">insert</a></li><li><a href="#method.insert_unique_unchecked">insert_unique_unchecked</a></li><li><a href="#method.into_keys">into_keys</a></li><li><a href="#method.into_values">into_values</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.iter">iter</a></li><li><a href="#method.iter_mut">iter_mut</a></li><li><a href="#method.keys">keys</a></li><li><a href="#method.len">len</a></li><li><a href="#method.remove">remove</a></li><li><a href="#method.remove_entry">remove_entry</a></li><li><a href="#method.reserve">reserve</a></li><li><a href="#method.retain">retain</a></li><li><a href="#method.shrink_to">shrink_to</a></li><li><a href="#method.shrink_to_fit">shrink_to_fit</a></li><li><a href="#method.try_insert">try_i
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<p>The default hashing algorithm is currently <a href="https://crates.io/crates/foldhash"><code>foldhash</code></a>, though this is
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subject to change at any point in the future. This hash function is very
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fast for all types of keys, but this algorithm will typically <em>not</em> protect
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against attacks such as HashDoS.</p>
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<p>The hashing algorithm can be replaced on a per-<code>HashMap</code> basis using the
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<a href="#method.default"><code>default</code></a>, <a href="#method.with_hasher"><code>with_hasher</code></a>, and <a href="#method.with_capacity_and_hasher"><code>with_capacity_and_hasher</code></a> methods. Many
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alternative algorithms are available on crates.io, such as the <a href="https://crates.io/crates/fnv"><code>fnv</code></a> crate.</p>
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<p>It is required that the keys implement the <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> and <a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> traits, although
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this can frequently be achieved by using <code>#[derive(PartialEq, Eq, Hash)]</code>.
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If you implement these yourself, it is important that the following
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property holds:</p>
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<div class="example-wrap"><pre class="language-text"><code>k1 == k2 -> hash(k1) == hash(k2)
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</code></pre></div>
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<p>In other words, if two keys are equal, their hashes must be equal.</p>
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<p>It is a logic error for a key to be modified in such a way that the key’s
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hash, as determined by the <a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> trait, or its equality, as determined by
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the <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> trait, changes while it is in the map. This is normally only
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possible through <a href="https://doc.rust-lang.org/std/cell/struct.Cell.html"><code>Cell</code></a>, <a href="https://doc.rust-lang.org/std/cell/struct.RefCell.html"><code>RefCell</code></a>, global state, I/O, or unsafe code.</p>
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<p>It is also a logic error for the <a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> implementation of a key to panic.
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This is generally only possible if the trait is implemented manually. If a
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panic does occur then the contents of the <code>HashMap</code> may become corrupted and
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some items may be dropped from the table.</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>hashbrown::HashMap;
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<span class="comment">// Type inference lets us omit an explicit type signature (which
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// would be `HashMap<String, String>` in this example).
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</span><span class="kw">let </span><span class="kw-2">mut </span>book_reviews = HashMap::new();
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<span class="comment">// Review some books.
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</span>book_reviews.insert(
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<span class="string">"Adventures of Huckleberry Finn"</span>.to_string(),
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<span class="string">"My favorite book."</span>.to_string(),
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);
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book_reviews.insert(
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<span class="string">"Grimms' Fairy Tales"</span>.to_string(),
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<span class="string">"Masterpiece."</span>.to_string(),
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);
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book_reviews.insert(
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|
<span class="string">"Pride and Prejudice"</span>.to_string(),
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<span class="string">"Very enjoyable."</span>.to_string(),
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);
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book_reviews.insert(
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<span class="string">"The Adventures of Sherlock Holmes"</span>.to_string(),
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<span class="string">"Eye lyked it alot."</span>.to_string(),
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);
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<span class="comment">// Check for a specific one.
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// When collections store owned values (String), they can still be
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// queried using references (&str).
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</span><span class="kw">if </span>!book_reviews.contains_key(<span class="string">"Les Misérables"</span>) {
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<span class="macro">println!</span>(<span class="string">"We've got {} reviews, but Les Misérables ain't one."</span>,
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book_reviews.len());
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}
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<span class="comment">// oops, this review has a lot of spelling mistakes, let's delete it.
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</span>book_reviews.remove(<span class="string">"The Adventures of Sherlock Holmes"</span>);
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<span class="comment">// Look up the values associated with some keys.
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</span><span class="kw">let </span>to_find = [<span class="string">"Pride and Prejudice"</span>, <span class="string">"Alice's Adventure in Wonderland"</span>];
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<span class="kw">for </span><span class="kw-2">&</span>book <span class="kw">in </span><span class="kw-2">&</span>to_find {
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<span class="kw">match </span>book_reviews.get(book) {
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<span class="prelude-val">Some</span>(review) => <span class="macro">println!</span>(<span class="string">"{}: {}"</span>, book, review),
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<span class="prelude-val">None </span>=> <span class="macro">println!</span>(<span class="string">"{} is unreviewed."</span>, book)
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}
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}
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<span class="comment">// Look up the value for a key (will panic if the key is not found).
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</span><span class="macro">println!</span>(<span class="string">"Review for Jane: {}"</span>, book_reviews[<span class="string">"Pride and Prejudice"</span>]);
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|
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<span class="comment">// Iterate over everything.
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</span><span class="kw">for </span>(book, review) <span class="kw">in </span><span class="kw-2">&</span>book_reviews {
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<span class="macro">println!</span>(<span class="string">"{}: \"{}\""</span>, book, review);
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}</code></pre></div>
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<p><code>HashMap</code> also implements an <a href="#method.entry"><code>Entry API</code></a>, which allows
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for more complex methods of getting, setting, updating and removing keys and
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their values:</p>
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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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|
|
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<span class="comment">// type inference lets us omit an explicit type signature (which
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|
// would be `HashMap<&str, u8>` in this example).
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</span><span class="kw">let </span><span class="kw-2">mut </span>player_stats = HashMap::new();
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<span class="kw">fn </span>random_stat_buff() -> u8 {
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<span class="comment">// could actually return some random value here - let's just return
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// some fixed value for now
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</span><span class="number">42
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</span>}
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<span class="comment">// insert a key only if it doesn't already exist
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</span>player_stats.entry(<span class="string">"health"</span>).or_insert(<span class="number">100</span>);
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<span class="comment">// insert a key using a function that provides a new value only if it
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// doesn't already exist
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</span>player_stats.entry(<span class="string">"defence"</span>).or_insert_with(random_stat_buff);
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<span class="comment">// update a key, guarding against the key possibly not being set
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</span><span class="kw">let </span>stat = player_stats.entry(<span class="string">"attack"</span>).or_insert(<span class="number">100</span>);
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<span class="kw-2">*</span>stat += random_stat_buff();</code></pre></div>
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<p>The easiest way to use <code>HashMap</code> with a custom key type is to derive <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> and <a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a>.
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We must also derive <a href="https://doc.rust-lang.org/std/cmp/trait.PartialEq.html"><code>PartialEq</code></a>.</p>
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|
|
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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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|
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<span class="attr">#[derive(Hash, Eq, PartialEq, Debug)]
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</span><span class="kw">struct </span>Viking {
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|
name: String,
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|
country: String,
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}
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<span class="kw">impl </span>Viking {
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<span class="doccomment">/// Creates a new Viking.
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</span><span class="kw">fn </span>new(name: <span class="kw-2">&</span>str, country: <span class="kw-2">&</span>str) -> Viking {
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Viking { name: name.to_string(), country: country.to_string() }
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}
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}
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<span class="comment">// Use a HashMap to store the vikings' health points.
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</span><span class="kw">let </span><span class="kw-2">mut </span>vikings = HashMap::new();
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vikings.insert(Viking::new(<span class="string">"Einar"</span>, <span class="string">"Norway"</span>), <span class="number">25</span>);
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vikings.insert(Viking::new(<span class="string">"Olaf"</span>, <span class="string">"Denmark"</span>), <span class="number">24</span>);
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vikings.insert(Viking::new(<span class="string">"Harald"</span>, <span class="string">"Iceland"</span>), <span class="number">12</span>);
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|
|
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|||
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|
<span class="comment">// Use derived implementation to print the status of the vikings.
|
|||
|
|
</span><span class="kw">for </span>(viking, health) <span class="kw">in </span><span class="kw-2">&</span>vikings {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"{:?} has {} hp"</span>, viking, health);
|
|||
|
|
}</code></pre></div>
|
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|
|
<p>A <code>HashMap</code> with fixed list of elements can be initialized from an array:</p>
|
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|
|
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|||
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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>timber_resources: HashMap<<span class="kw-2">&</span>str, i32> = [(<span class="string">"Norway"</span>, <span class="number">100</span>), (<span class="string">"Denmark"</span>, <span class="number">50</span>), (<span class="string">"Iceland"</span>, <span class="number">10</span>)]
|
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|
.into_iter().collect();
|
|||
|
|
<span class="comment">// use the values stored in map</span></code></pre></div>
|
|||
|
|
</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-HashMap%3CK,+V,+S%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#420-504">source</a><a href="#impl-HashMap%3CK,+V,+S%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S> <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_hasher" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#456-461">source</a><h4 class="code-header">pub const fn <a href="#method.with_hasher" class="fn">with_hasher</a>(hash_builder: S) -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashMap</code> which will use the given hash builder to hash
|
|||
|
|
keys.</p>
|
|||
|
|
<p>The hash map is initially created with a capacity of 0, so it will not
|
|||
|
|
allocate until it is first inserted into.</p>
|
|||
|
|
<h5 id="hashdos-resistance"><a class="doc-anchor" href="#hashdos-resistance">§</a>HashDoS resistance</h5>
|
|||
|
|
<p>The <code>hash_builder</code> normally use a fixed key by default and that does
|
|||
|
|
not allow the <code>HashMap</code> to be protected against attacks such as <a href="https://en.wikipedia.org/wiki/Collision_attack"><code>HashDoS</code></a>.
|
|||
|
|
Users who require HashDoS resistance should explicitly use
|
|||
|
|
<a href="https://doc.rust-lang.org/std/collections/hash_map/struct.RandomState.html"><code>std::collections::hash_map::RandomState</code></a>
|
|||
|
|
as the hasher when creating a <a href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap"><code>HashMap</code></a>.</p>
|
|||
|
|
<p>The <code>hash_builder</code> passed should implement the <a href="https://doc.rust-lang.org/std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a> trait for
|
|||
|
|
the <code>HashMap</code> to be useful, see its documentation for details.</p>
|
|||
|
|
<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
|
|||
|
|
<span class="kw">use </span>hashbrown::DefaultHashBuilder;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>s = DefaultHashBuilder::default();
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::with_hasher(s);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">0</span>);
|
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|
|
<span class="macro">assert_eq!</span>(map.capacity(), <span class="number">0</span>);
|
|||
|
|
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">2</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_capacity_and_hasher" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#498-503">source</a><h4 class="code-header">pub fn <a href="#method.with_capacity_and_hasher" class="fn">with_capacity_and_hasher</a>(capacity: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>, hash_builder: S) -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashMap</code> with the specified capacity, using <code>hash_builder</code>
|
|||
|
|
to hash the keys.</p>
|
|||
|
|
<p>The hash map will be able to hold at least <code>capacity</code> elements without
|
|||
|
|
reallocating. If <code>capacity</code> is 0, the hash map will not allocate.</p>
|
|||
|
|
<h5 id="hashdos-resistance-1"><a class="doc-anchor" href="#hashdos-resistance-1">§</a>HashDoS resistance</h5>
|
|||
|
|
<p>The <code>hash_builder</code> normally use a fixed key by default and that does
|
|||
|
|
not allow the <code>HashMap</code> to be protected against attacks such as <a href="https://en.wikipedia.org/wiki/Collision_attack"><code>HashDoS</code></a>.
|
|||
|
|
Users who require HashDoS resistance should explicitly use
|
|||
|
|
<a href="https://doc.rust-lang.org/std/collections/hash_map/struct.RandomState.html"><code>std::collections::hash_map::RandomState</code></a>
|
|||
|
|
as the hasher when creating a <a href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap"><code>HashMap</code></a>.</p>
|
|||
|
|
<p>The <code>hash_builder</code> passed should implement the <a href="https://doc.rust-lang.org/std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a> trait for
|
|||
|
|
the <code>HashMap</code> to be useful, see its documentation for details.</p>
|
|||
|
|
<h5 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h5>
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
|
|||
|
|
<span class="kw">use </span>hashbrown::DefaultHashBuilder;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>s = DefaultHashBuilder::default();
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::with_capacity_and_hasher(<span class="number">10</span>, s);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">0</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">10</span>);
|
|||
|
|
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">2</span>);</code></pre></div>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#506-1066">source</a><a href="#impl-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A: Allocator> <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.allocator" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#509-511">source</a><h4 class="code-header">pub fn <a href="#method.allocator" class="fn">allocator</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&A</a></h4></section></summary><div class="docblock"><p>Returns a reference to the underlying allocator.</p>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_hasher_in" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#541-546">source</a><h4 class="code-header">pub const fn <a href="#method.with_hasher_in" class="fn">with_hasher_in</a>(hash_builder: S, alloc: A) -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashMap</code> which will use the given hash builder to hash
|
|||
|
|
keys. It will be allocated with the given allocator.</p>
|
|||
|
|
<p>The hash map is initially created with a capacity of 0, so it will not allocate until it
|
|||
|
|
is first inserted into.</p>
|
|||
|
|
<h5 id="hashdos-resistance-2"><a class="doc-anchor" href="#hashdos-resistance-2">§</a>HashDoS resistance</h5>
|
|||
|
|
<p>The <code>hash_builder</code> normally use a fixed key by default and that does
|
|||
|
|
not allow the <code>HashMap</code> to be protected against attacks such as <a href="https://en.wikipedia.org/wiki/Collision_attack"><code>HashDoS</code></a>.
|
|||
|
|
Users who require HashDoS resistance should explicitly use
|
|||
|
|
<a href="https://doc.rust-lang.org/std/collections/hash_map/struct.RandomState.html"><code>std::collections::hash_map::RandomState</code></a>
|
|||
|
|
as the hasher when creating a <a href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap"><code>HashMap</code></a>.</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">use </span>hashbrown::DefaultHashBuilder;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>s = DefaultHashBuilder::default();
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::with_hasher(s);
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">2</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.with_capacity_and_hasher_in" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#576-581">source</a><h4 class="code-header">pub fn <a href="#method.with_capacity_and_hasher_in" class="fn">with_capacity_and_hasher_in</a>(
|
|||
|
|
capacity: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>,
|
|||
|
|
hash_builder: S,
|
|||
|
|
alloc: A,
|
|||
|
|
) -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashMap</code> with the specified capacity, using <code>hash_builder</code>
|
|||
|
|
to hash the keys. It will be allocated with the given allocator.</p>
|
|||
|
|
<p>The hash map will be able to hold at least <code>capacity</code> elements without
|
|||
|
|
reallocating. If <code>capacity</code> is 0, the hash map will not allocate.</p>
|
|||
|
|
<h5 id="hashdos-resistance-3"><a class="doc-anchor" href="#hashdos-resistance-3">§</a>HashDoS resistance</h5>
|
|||
|
|
<p>The <code>hash_builder</code> normally use a fixed key by default and that does
|
|||
|
|
not allow the <code>HashMap</code> to be protected against attacks such as <a href="https://en.wikipedia.org/wiki/Collision_attack"><code>HashDoS</code></a>.
|
|||
|
|
Users who require HashDoS resistance should explicitly use
|
|||
|
|
<a href="https://doc.rust-lang.org/std/collections/hash_map/struct.RandomState.html"><code>std::collections::hash_map::RandomState</code></a>
|
|||
|
|
as the hasher when creating a <a href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap"><code>HashMap</code></a>.</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">use </span>hashbrown::DefaultHashBuilder;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>s = DefaultHashBuilder::default();
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::with_capacity_and_hasher(<span class="number">10</span>, s);
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">2</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.hasher" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#598-600">source</a><h4 class="code-header">pub fn <a href="#method.hasher" class="fn">hasher</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&S</a></h4></section></summary><div class="docblock"><p>Returns a reference to the map’s <a href="https://doc.rust-lang.org/std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a>.</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">use </span>hashbrown::DefaultHashBuilder;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>hasher = DefaultHashBuilder::default();
|
|||
|
|
<span class="kw">let </span>map: HashMap<i32, i32> = HashMap::with_hasher(hasher);
|
|||
|
|
<span class="kw">let </span>hasher: <span class="kw-2">&</span>DefaultHashBuilder = map.hasher();</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.capacity" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#616-618">source</a><h4 class="code-header">pub fn <a href="#method.capacity" class="fn">capacity</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of elements the map can hold without reallocating.</p>
|
|||
|
|
<p>This number is a lower bound; the <code>HashMap<K, V></code> might be able to hold
|
|||
|
|
more, but is guaranteed to be able to hold at least this many.</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>map: HashMap<i32, i32> = HashMap::with_capacity(<span class="number">100</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">0</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">100</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.keys" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#648-650">source</a><h4 class="code-header">pub fn <a href="#method.keys" class="fn">keys</a>(&self) -> <a class="struct" href="struct.Keys.html" title="struct hashbrown::hash_map::Keys">Keys</a><'_, K, V> <a href="#" class="tooltip" data-notable-ty="Keys<'_, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all keys in arbitrary order.
|
|||
|
|
The iterator element type is <code>&'a K</code>.</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">let </span><span class="kw-2">mut </span>map = HashMap::new();
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<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">let </span><span class="kw-2">mut </span>vec: Vec<<span class="kw-2">&</span>str> = Vec::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>key <span class="kw">in </span>map.keys() {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"{}"</span>, key);
|
|||
|
|
vec.push(<span class="kw-2">*</span>key);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="comment">// The `Keys` iterator produces keys in arbitrary order, so the
|
|||
|
|
// keys 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="string">"b"</span>, <span class="string">"c"</span>]);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.values" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#680-682">source</a><h4 class="code-header">pub fn <a href="#method.values" class="fn">values</a>(&self) -> <a class="struct" href="struct.Values.html" title="struct hashbrown::hash_map::Values">Values</a><'_, K, V> <a href="#" class="tooltip" data-notable-ty="Values<'_, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all values in arbitrary order.
|
|||
|
|
The iterator element type is <code>&'a V</code>.</p>
|
|||
|
|
<h5 id="examples-8"><a class="doc-anchor" href="#examples-8">§</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::new();
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<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">let </span><span class="kw-2">mut </span>vec: Vec<i32> = Vec::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>val <span class="kw">in </span>map.values() {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"{}"</span>, val);
|
|||
|
|
vec.push(<span class="kw-2">*</span>val);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="comment">// The `Values` iterator produces values in arbitrary order, so the
|
|||
|
|
// values must be sorted to test them against a sorted array.
|
|||
|
|
</span>vec.sort_unstable();
|
|||
|
|
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.values_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#718-722">source</a><h4 class="code-header">pub fn <a href="#method.values_mut" class="fn">values_mut</a>(&mut self) -> <a class="struct" href="struct.ValuesMut.html" title="struct hashbrown::hash_map::ValuesMut">ValuesMut</a><'_, K, V> <a href="#" class="tooltip" data-notable-ty="ValuesMut<'_, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all values mutably in arbitrary order.
|
|||
|
|
The iterator element type is <code>&'a mut V</code>.</p>
|
|||
|
|
<h5 id="examples-9"><a class="doc-anchor" href="#examples-9">§</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::new();
|
|||
|
|
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<span class="string">"c"</span>, <span class="number">3</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>val <span class="kw">in </span>map.values_mut() {
|
|||
|
|
<span class="kw-2">*</span>val = <span class="kw-2">*</span>val + <span class="number">10</span>;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<i32> = Vec::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>val <span class="kw">in </span>map.values() {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"{}"</span>, val);
|
|||
|
|
vec.push(<span class="kw-2">*</span>val);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="comment">// The `Values` iterator produces values in arbitrary order, so the
|
|||
|
|
// values must be sorted to test them against a sorted array.
|
|||
|
|
</span>vec.sort_unstable();
|
|||
|
|
<span class="macro">assert_eq!</span>(vec, [<span class="number">11</span>, <span class="number">12</span>, <span class="number">13</span>]);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.iter" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#752-760">source</a><h4 class="code-header">pub fn <a href="#method.iter" class="fn">iter</a>(&self) -> <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_map::Iter">Iter</a><'_, K, V> <a href="#" class="tooltip" data-notable-ty="Iter<'_, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all key-value pairs in arbitrary order.
|
|||
|
|
The iterator element type is <code>(&'a K, &'a V)</code>.</p>
|
|||
|
|
<h5 id="examples-10"><a class="doc-anchor" href="#examples-10">§</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::new();
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<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">let </span><span class="kw-2">mut </span>vec: Vec<(<span class="kw-2">&</span>str, i32)> = Vec::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>(key, val) <span class="kw">in </span>map.iter() {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"key: {} val: {}"</span>, key, val);
|
|||
|
|
vec.push((<span class="kw-2">*</span>key, <span class="kw-2">*</span>val));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<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">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>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.iter_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#797-805">source</a><h4 class="code-header">pub fn <a href="#method.iter_mut" class="fn">iter_mut</a>(&mut self) -> <a class="struct" href="struct.IterMut.html" title="struct hashbrown::hash_map::IterMut">IterMut</a><'_, K, V> <a href="#" class="tooltip" data-notable-ty="IterMut<'_, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all key-value pairs in arbitrary order,
|
|||
|
|
with mutable references to the values.
|
|||
|
|
The iterator element type is <code>(&'a K, &'a mut V)</code>.</p>
|
|||
|
|
<h5 id="examples-11"><a class="doc-anchor" href="#examples-11">§</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::new();
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<span class="string">"c"</span>, <span class="number">3</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Update all values
|
|||
|
|
</span><span class="kw">for </span>(<span class="kw">_</span>, val) <span class="kw">in </span>map.iter_mut() {
|
|||
|
|
<span class="kw-2">*</span>val <span class="kw-2">*</span>= <span class="number">2</span>;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<(<span class="kw-2">&</span>str, i32)> = Vec::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>(key, val) <span class="kw">in </span><span class="kw-2">&</span>map {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"key: {} val: {}"</span>, key, val);
|
|||
|
|
vec.push((<span class="kw-2">*</span>key, <span class="kw-2">*</span>val));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<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">2</span>), (<span class="string">"b"</span>, <span class="number">4</span>), (<span class="string">"c"</span>, <span class="number">6</span>)]);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">3</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.len" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#826-828">source</a><h4 class="code-header">pub fn <a href="#method.len" class="fn">len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of elements in the map.</p>
|
|||
|
|
<h5 id="examples-12"><a class="doc-anchor" href="#examples-12">§</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>a = HashMap::new();
|
|||
|
|
<span class="macro">assert_eq!</span>(a.len(), <span class="number">0</span>);
|
|||
|
|
a.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(a.len(), <span class="number">1</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_empty" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#843-845">source</a><h4 class="code-header">pub fn <a href="#method.is_empty" class="fn">is_empty</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the map contains no elements.</p>
|
|||
|
|
<h5 id="examples-13"><a class="doc-anchor" href="#examples-13">§</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>a = HashMap::new();
|
|||
|
|
<span class="macro">assert!</span>(a.is_empty());
|
|||
|
|
a.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert!</span>(!a.is_empty());</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.drain" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#886-890">source</a><h4 class="code-header">pub fn <a href="#method.drain" class="fn">drain</a>(&mut self) -> <a class="struct" href="struct.Drain.html" title="struct hashbrown::hash_map::Drain">Drain</a><'_, K, V, A> <a href="#" class="tooltip" data-notable-ty="Drain<'_, K, V, A>">ⓘ</a></h4></section></summary><div class="docblock"><p>Clears the map, returning all key-value pairs as an iterator. Keeps the
|
|||
|
|
allocated memory for reuse.</p>
|
|||
|
|
<p>If the returned iterator is dropped before being fully consumed, it
|
|||
|
|
drops the remaining key-value pairs. The returned iterator keeps a
|
|||
|
|
mutable borrow on the vector to optimize its implementation.</p>
|
|||
|
|
<h5 id="examples-14"><a class="doc-anchor" href="#examples-14">§</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>a = HashMap::new();
|
|||
|
|
a.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
a.insert(<span class="number">2</span>, <span class="string">"b"</span>);
|
|||
|
|
<span class="kw">let </span>capacity_before_drain = a.capacity();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>(k, v) <span class="kw">in </span>a.drain().take(<span class="number">1</span>) {
|
|||
|
|
<span class="macro">assert!</span>(k == <span class="number">1 </span>|| k == <span class="number">2</span>);
|
|||
|
|
<span class="macro">assert!</span>(v == <span class="string">"a" </span>|| v == <span class="string">"b"</span>);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="comment">// As we can see, the map is empty and contains no element.
|
|||
|
|
</span><span class="macro">assert!</span>(a.is_empty() && a.len() == <span class="number">0</span>);
|
|||
|
|
<span class="comment">// But map capacity is equal to old one.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(a.capacity(), capacity_before_drain);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>a = HashMap::new();
|
|||
|
|
a.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
a.insert(<span class="number">2</span>, <span class="string">"b"</span>);
|
|||
|
|
|
|||
|
|
{ <span class="comment">// Iterator is dropped without being consumed.
|
|||
|
|
</span><span class="kw">let </span>d = a.drain();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="comment">// But the map is empty even if we do not use Drain iterator.
|
|||
|
|
</span><span class="macro">assert!</span>(a.is_empty());</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.retain" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#915-928">source</a><h4 class="code-header">pub fn <a href="#method.retain" class="fn">retain</a><F>(&mut self, f: F)<div class="where">where
|
|||
|
|
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Retains only the elements specified by the predicate. Keeps the
|
|||
|
|
allocated memory for reuse.</p>
|
|||
|
|
<p>In other words, remove all pairs <code>(k, v)</code> such that <code>f(&k, &mut v)</code> returns <code>false</code>.
|
|||
|
|
The elements are visited in unsorted (and unspecified) order.</p>
|
|||
|
|
<h5 id="examples-15"><a class="doc-anchor" href="#examples-15">§</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<i32, i32> = (<span class="number">0</span>..<span class="number">8</span>).map(|x|(x, x<span class="kw-2">*</span><span class="number">10</span>)).collect();
|
|||
|
|
<span class="macro">assert_eq!</span>(map.len(), <span class="number">8</span>);
|
|||
|
|
|
|||
|
|
map.retain(|<span class="kw-2">&</span>k, <span class="kw">_</span>| k % <span class="number">2 </span>== <span class="number">0</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// We can see, that the number of elements inside map is changed.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.len(), <span class="number">4</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<(i32, i32)> = map.iter().map(|(<span class="kw-2">&</span>k, <span class="kw-2">&</span>v)| (k, v)).collect();
|
|||
|
|
vec.sort_unstable();
|
|||
|
|
<span class="macro">assert_eq!</span>(vec, [(<span class="number">0</span>, <span class="number">0</span>), (<span class="number">2</span>, <span class="number">20</span>), (<span class="number">4</span>, <span class="number">40</span>), (<span class="number">6</span>, <span class="number">60</span>)]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.extract_if" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#974-985">source</a><h4 class="code-header">pub fn <a href="#method.extract_if" class="fn">extract_if</a><F>(&mut self, f: F) -> <a class="struct" href="struct.ExtractIf.html" title="struct hashbrown::hash_map::ExtractIf">ExtractIf</a><'_, K, V, F, A> <a href="#" class="tooltip" data-notable-ty="ExtractIf<'_, K, V, F, A>">ⓘ</a><div class="where">where
|
|||
|
|
F: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Drains elements which are true under the given predicate,
|
|||
|
|
and returns an iterator over the removed items.</p>
|
|||
|
|
<p>In other words, move all pairs <code>(k, v)</code> such that <code>f(&k, &mut v)</code> returns <code>true</code> out
|
|||
|
|
into another iterator.</p>
|
|||
|
|
<p>Note that <code>extract_if</code> lets you mutate every value in the filter closure, regardless of
|
|||
|
|
whether you choose to keep or remove it.</p>
|
|||
|
|
<p>If the returned <code>ExtractIf</code> is not exhausted, e.g. because it is dropped without iterating
|
|||
|
|
or the iteration short-circuits, then the remaining elements will be retained.
|
|||
|
|
Use <a href="struct.HashMap.html#method.retain" title="method hashbrown::hash_map::HashMap::retain"><code>retain()</code></a> with a negated predicate if you do not need the returned iterator.</p>
|
|||
|
|
<p>Keeps the allocated memory for reuse.</p>
|
|||
|
|
<h5 id="examples-16"><a class="doc-anchor" href="#examples-16">§</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<i32, i32> = (<span class="number">0</span>..<span class="number">8</span>).map(|x| (x, x)).collect();
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>drained: HashMap<i32, i32> = map.extract_if(|k, _v| k % <span class="number">2 </span>== <span class="number">0</span>).collect();
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>evens = drained.keys().cloned().collect::<Vec<<span class="kw">_</span>>>();
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>odds = map.keys().cloned().collect::<Vec<<span class="kw">_</span>>>();
|
|||
|
|
evens.sort();
|
|||
|
|
odds.sort();
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(evens, <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">2</span>, <span class="number">4</span>, <span class="number">6</span>]);
|
|||
|
|
<span class="macro">assert_eq!</span>(odds, <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">7</span>]);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<i32, i32> = (<span class="number">0</span>..<span class="number">8</span>).map(|x| (x, x)).collect();
|
|||
|
|
|
|||
|
|
{ <span class="comment">// Iterator is dropped without being consumed.
|
|||
|
|
</span><span class="kw">let </span>d = map.extract_if(|k, _v| k % <span class="number">2 </span>!= <span class="number">0</span>);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="comment">// ExtractIf was not exhausted, therefore no elements were drained.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.len(), <span class="number">8</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.clear" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1007-1009">source</a><h4 class="code-header">pub fn <a href="#method.clear" class="fn">clear</a>(&mut self)</h4></section></summary><div class="docblock"><p>Clears the map, removing all key-value pairs. Keeps the allocated memory
|
|||
|
|
for reuse.</p>
|
|||
|
|
<h5 id="examples-17"><a class="doc-anchor" href="#examples-17">§</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>a = HashMap::new();
|
|||
|
|
a.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="kw">let </span>capacity_before_clear = a.capacity();
|
|||
|
|
|
|||
|
|
a.clear();
|
|||
|
|
|
|||
|
|
<span class="comment">// Map is empty.
|
|||
|
|
</span><span class="macro">assert!</span>(a.is_empty());
|
|||
|
|
<span class="comment">// But map capacity is equal to old one.
|
|||
|
|
</span><span class="macro">assert_eq!</span>(a.capacity(), capacity_before_clear);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.into_keys" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1033-1037">source</a><h4 class="code-header">pub fn <a href="#method.into_keys" class="fn">into_keys</a>(self) -> <a class="struct" href="struct.IntoKeys.html" title="struct hashbrown::hash_map::IntoKeys">IntoKeys</a><K, V, A> <a href="#" class="tooltip" data-notable-ty="IntoKeys<K, V, A>">ⓘ</a></h4></section></summary><div class="docblock"><p>Creates a consuming iterator visiting all the keys in arbitrary order.
|
|||
|
|
The map cannot be used after calling this.
|
|||
|
|
The iterator element type is <code>K</code>.</p>
|
|||
|
|
<h5 id="examples-18"><a class="doc-anchor" href="#examples-18">§</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::new();
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<span class="string">"c"</span>, <span class="number">3</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<<span class="kw-2">&</span>str> = map.into_keys().collect();
|
|||
|
|
|
|||
|
|
<span class="comment">// The `IntoKeys` iterator produces keys in arbitrary order, so the
|
|||
|
|
// keys 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="string">"b"</span>, <span class="string">"c"</span>]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.into_values" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1061-1065">source</a><h4 class="code-header">pub fn <a href="#method.into_values" class="fn">into_values</a>(self) -> <a class="struct" href="struct.IntoValues.html" title="struct hashbrown::hash_map::IntoValues">IntoValues</a><K, V, A> <a href="#" class="tooltip" data-notable-ty="IntoValues<K, V, A>">ⓘ</a></h4></section></summary><div class="docblock"><p>Creates a consuming iterator visiting all the values in arbitrary order.
|
|||
|
|
The map cannot be used after calling this.
|
|||
|
|
The iterator element type is <code>V</code>.</p>
|
|||
|
|
<h5 id="examples-19"><a class="doc-anchor" href="#examples-19">§</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::new();
|
|||
|
|
map.insert(<span class="string">"a"</span>, <span class="number">1</span>);
|
|||
|
|
map.insert(<span class="string">"b"</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<span class="string">"c"</span>, <span class="number">3</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<i32> = map.into_values().collect();
|
|||
|
|
|
|||
|
|
<span class="comment">// The `IntoValues` iterator produces values in arbitrary order, so
|
|||
|
|
// the values must be sorted to test them against a sorted array.
|
|||
|
|
</span>vec.sort_unstable();
|
|||
|
|
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-HashMap%3CK,+V,+S,+A%3E-1" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1068-2008">source</a><a href="#impl-HashMap%3CK,+V,+S,+A%3E-1" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.reserve" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1101-1104">source</a><h4 class="code-header">pub fn <a href="#method.reserve" class="fn">reserve</a>(&mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Reserves capacity for at least <code>additional</code> more elements to be inserted
|
|||
|
|
in the <code>HashMap</code>. The collection may reserve more space to avoid
|
|||
|
|
frequent reallocations.</p>
|
|||
|
|
<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
|
|||
|
|
<p>Panics if the new capacity exceeds <a href="https://doc.rust-lang.org/std/primitive.isize.html"><code>isize::MAX</code></a> bytes and <a href="https://doc.rust-lang.org/alloc/alloc/fn.handle_alloc_error.html"><code>abort</code></a> the program
|
|||
|
|
in case of allocation error. Use <a href="struct.HashMap.html#method.try_reserve" title="method hashbrown::hash_map::HashMap::try_reserve"><code>try_reserve</code></a> instead
|
|||
|
|
if you want to handle memory allocation failure.</p>
|
|||
|
|
<h5 id="examples-20"><a class="doc-anchor" href="#examples-20">§</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, i32> = HashMap::new();
|
|||
|
|
<span class="comment">// Map is empty and doesn't allocate memory
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.capacity(), <span class="number">0</span>);
|
|||
|
|
|
|||
|
|
map.reserve(<span class="number">10</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// And now map can hold at least 10 elements
|
|||
|
|
</span><span class="macro">assert!</span>(map.capacity() >= <span class="number">10</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.try_reserve" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1151-1154">source</a><h4 class="code-header">pub fn <a href="#method.try_reserve" class="fn">try_reserve</a>(&mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.unit.html">()</a>, <a class="enum" href="../enum.TryReserveError.html" title="enum hashbrown::TryReserveError">TryReserveError</a>></h4></section></summary><div class="docblock"><p>Tries to reserve capacity for at least <code>additional</code> more elements to be inserted
|
|||
|
|
in the given <code>HashMap<K,V></code>. The collection may reserve more space to avoid
|
|||
|
|
frequent reallocations.</p>
|
|||
|
|
<h5 id="errors"><a class="doc-anchor" href="#errors">§</a>Errors</h5>
|
|||
|
|
<p>If the capacity overflows, or the allocator reports a failure, then an error
|
|||
|
|
is returned.</p>
|
|||
|
|
<h5 id="examples-21"><a class="doc-anchor" href="#examples-21">§</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, isize> = HashMap::new();
|
|||
|
|
<span class="comment">// Map is empty and doesn't allocate memory
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.capacity(), <span class="number">0</span>);
|
|||
|
|
|
|||
|
|
map.try_reserve(<span class="number">10</span>).expect(<span class="string">"why is the test harness OOMing on 10 bytes?"</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// And now map can hold at least 10 elements
|
|||
|
|
</span><span class="macro">assert!</span>(map.capacity() >= <span class="number">10</span>);</code></pre></div>
|
|||
|
|
<p>If the capacity overflows, or the allocator reports a failure, then an error
|
|||
|
|
is returned:</p>
|
|||
|
|
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashMap;
|
|||
|
|
<span class="kw">use </span>hashbrown::TryReserveError;
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map: HashMap<i32, i32> = HashMap::new();
|
|||
|
|
|
|||
|
|
<span class="kw">match </span>map.try_reserve(usize::MAX) {
|
|||
|
|
<span class="prelude-val">Err</span>(error) => <span class="kw">match </span>error {
|
|||
|
|
TryReserveError::CapacityOverflow => {}
|
|||
|
|
<span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"TryReserveError::AllocError ?"</span>),
|
|||
|
|
},
|
|||
|
|
<span class="kw">_ </span>=> <span class="macro">panic!</span>(),
|
|||
|
|
}</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.shrink_to_fit" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1173-1176">source</a><h4 class="code-header">pub fn <a href="#method.shrink_to_fit" class="fn">shrink_to_fit</a>(&mut self)</h4></section></summary><div class="docblock"><p>Shrinks the capacity of the map as much as possible. It will drop
|
|||
|
|
down as much as possible while maintaining the internal rules
|
|||
|
|
and possibly leaving some space in accordance with the resize policy.</p>
|
|||
|
|
<h5 id="examples-22"><a class="doc-anchor" href="#examples-22">§</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<i32, i32> = HashMap::with_capacity(<span class="number">100</span>);
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<span class="number">3</span>, <span class="number">4</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">100</span>);
|
|||
|
|
map.shrink_to_fit();
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">2</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.shrink_to" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1202-1205">source</a><h4 class="code-header">pub fn <a href="#method.shrink_to" class="fn">shrink_to</a>(&mut self, min_capacity: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Shrinks the capacity of the map with a lower limit. It will drop
|
|||
|
|
down no lower than the supplied limit while maintaining the internal rules
|
|||
|
|
and possibly leaving some space in accordance with the resize policy.</p>
|
|||
|
|
<p>This function does nothing if the current capacity is smaller than the
|
|||
|
|
supplied minimum capacity.</p>
|
|||
|
|
<h5 id="examples-23"><a class="doc-anchor" href="#examples-23">§</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<i32, i32> = HashMap::with_capacity(<span class="number">100</span>);
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">2</span>);
|
|||
|
|
map.insert(<span class="number">3</span>, <span class="number">4</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">100</span>);
|
|||
|
|
map.shrink_to(<span class="number">10</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">10</span>);
|
|||
|
|
map.shrink_to(<span class="number">0</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">2</span>);
|
|||
|
|
map.shrink_to(<span class="number">10</span>);
|
|||
|
|
<span class="macro">assert!</span>(map.capacity() >= <span class="number">2</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.entry" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1227-1242">source</a><h4 class="code-header">pub fn <a href="#method.entry" class="fn">entry</a>(&mut self, key: K) -> <a class="enum" href="enum.Entry.html" title="enum hashbrown::hash_map::Entry">Entry</a><'_, K, V, S, A></h4></section></summary><div class="docblock"><p>Gets the given key’s corresponding entry in the map for in-place manipulation.</p>
|
|||
|
|
<h5 id="examples-24"><a class="doc-anchor" href="#examples-24">§</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>letters = HashMap::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>ch <span class="kw">in </span><span class="string">"a short treatise on fungi"</span>.chars() {
|
|||
|
|
<span class="kw">let </span>counter = letters.entry(ch).or_insert(<span class="number">0</span>);
|
|||
|
|
<span class="kw-2">*</span>counter += <span class="number">1</span>;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(letters[<span class="kw-2">&</span><span class="string">'s'</span>], <span class="number">2</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(letters[<span class="kw-2">&</span><span class="string">'t'</span>], <span class="number">3</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(letters[<span class="kw-2">&</span><span class="string">'u'</span>], <span class="number">1</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(letters.get(<span class="kw-2">&</span><span class="string">'y'</span>), <span class="prelude-val">None</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.entry_ref" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1262-1280">source</a><h4 class="code-header">pub fn <a href="#method.entry_ref" class="fn">entry_ref</a><'a, 'b, Q>(
|
|||
|
|
&'a mut self,
|
|||
|
|
key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'b Q</a>,
|
|||
|
|
) -> <a class="enum" href="enum.EntryRef.html" title="enum hashbrown::hash_map::EntryRef">EntryRef</a><'a, 'b, K, Q, V, S, A><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Gets the given key’s corresponding entry by reference in the map for in-place manipulation.</p>
|
|||
|
|
<h5 id="examples-25"><a class="doc-anchor" href="#examples-25">§</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>words: HashMap<String, usize> = HashMap::new();
|
|||
|
|
<span class="kw">let </span>source = [<span class="string">"poneyland"</span>, <span class="string">"horseyland"</span>, <span class="string">"poneyland"</span>, <span class="string">"poneyland"</span>];
|
|||
|
|
<span class="kw">for </span>(i, <span class="kw-2">&</span>s) <span class="kw">in </span>source.iter().enumerate() {
|
|||
|
|
<span class="kw">let </span>counter = words.entry_ref(s).or_insert(<span class="number">0</span>);
|
|||
|
|
<span class="kw-2">*</span>counter += <span class="number">1</span>;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(words[<span class="string">"poneyland"</span>], <span class="number">3</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(words[<span class="string">"horseyland"</span>], <span class="number">1</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1302-1311">source</a><h4 class="code-header">pub fn <a href="#method.get" class="fn">get</a><Q>(&self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&V</a>><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns a reference to the value corresponding to the key.</p>
|
|||
|
|
<p>The key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-26"><a class="doc-anchor" href="#examples-26">§</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::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">"a"</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">None</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_key_value" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1333-1342">source</a><h4 class="code-header">pub fn <a href="#method.get_key_value" class="fn">get_key_value</a><Q>(&self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&V</a>)><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns the key-value pair corresponding to the supplied key.</p>
|
|||
|
|
<p>The supplied key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-27"><a class="doc-anchor" href="#examples-27">§</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::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get_key_value(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span><span class="string">"a"</span>)));
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get_key_value(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">None</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_key_value_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1381-1390">source</a><h4 class="code-header">pub fn <a href="#method.get_key_value_mut" class="fn">get_key_value_mut</a><Q>(&mut self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>)><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns the key-value pair corresponding to the supplied key, with a mutable reference to value.</p>
|
|||
|
|
<p>The supplied key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-28"><a class="doc-anchor" href="#examples-28">§</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::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="kw">let </span>(k, v) = map.get_key_value_mut(<span class="kw-2">&</span><span class="number">1</span>).unwrap();
|
|||
|
|
<span class="macro">assert_eq!</span>(k, <span class="kw-2">&</span><span class="number">1</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&mut </span><span class="string">"a"</span>);
|
|||
|
|
<span class="kw-2">*</span>v = <span class="string">"b"</span>;
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get_key_value_mut(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&mut </span><span class="string">"b"</span>)));
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get_key_value_mut(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">None</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.contains_key" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1412-1417">source</a><h4 class="code-header">pub fn <a href="#method.contains_key" class="fn">contains_key</a><Q>(&self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the map contains a value for the specified key.</p>
|
|||
|
|
<p>The key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-29"><a class="doc-anchor" href="#examples-29">§</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::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.contains_key(<span class="kw-2">&</span><span class="number">1</span>), <span class="bool-val">true</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.contains_key(<span class="kw-2">&</span><span class="number">2</span>), <span class="bool-val">false</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1443-1452">source</a><h4 class="code-header">pub fn <a href="#method.get_mut" class="fn">get_mut</a><Q>(&mut self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Returns a mutable reference to the value corresponding to the key.</p>
|
|||
|
|
<p>The key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-30"><a class="doc-anchor" href="#examples-30">§</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::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
<span class="kw">if let </span><span class="prelude-val">Some</span>(x) = map.get_mut(<span class="kw-2">&</span><span class="number">1</span>) {
|
|||
|
|
<span class="kw-2">*</span>x = <span class="string">"b"</span>;
|
|||
|
|
}
|
|||
|
|
<span class="macro">assert_eq!</span>(map[<span class="kw-2">&</span><span class="number">1</span>], <span class="string">"b"</span>);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.get_mut(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">None</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_many_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1532-1537">source</a><h4 class="code-header">pub fn <a href="#method.get_many_mut" class="fn">get_many_mut</a><Q, const N: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>>(
|
|||
|
|
&mut self,
|
|||
|
|
ks: [<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>],
|
|||
|
|
) -> [<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>]<div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Attempts to get mutable references to <code>N</code> values in the map at once.</p>
|
|||
|
|
<p>Returns an array of length <code>N</code> with the results of each query. For soundness, at most one
|
|||
|
|
mutable reference will be returned to any value. <code>None</code> will be used if the key is missing.</p>
|
|||
|
|
<h5 id="panics-1"><a class="doc-anchor" href="#panics-1">§</a>Panics</h5>
|
|||
|
|
<p>Panics if any keys are overlapping.</p>
|
|||
|
|
<h5 id="examples-31"><a class="doc-anchor" href="#examples-31">§</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>libraries = HashMap::new();
|
|||
|
|
libraries.insert(<span class="string">"Bodleian Library"</span>.to_string(), <span class="number">1602</span>);
|
|||
|
|
libraries.insert(<span class="string">"Athenæum"</span>.to_string(), <span class="number">1807</span>);
|
|||
|
|
libraries.insert(<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="number">1691</span>);
|
|||
|
|
libraries.insert(<span class="string">"Library of Congress"</span>.to_string(), <span class="number">1800</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Get Athenæum and Bodleian Library
|
|||
|
|
</span><span class="kw">let </span>[<span class="prelude-val">Some</span>(a), <span class="prelude-val">Some</span>(b)] = libraries.get_many_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
]) <span class="kw">else </span>{ <span class="macro">panic!</span>() };
|
|||
|
|
|
|||
|
|
<span class="comment">// Assert values of Athenæum and Library of Congress
|
|||
|
|
</span><span class="kw">let </span>got = libraries.get_many_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"Library of Congress"</span>,
|
|||
|
|
]);
|
|||
|
|
<span class="macro">assert_eq!</span>(
|
|||
|
|
got,
|
|||
|
|
[
|
|||
|
|
<span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1807</span>),
|
|||
|
|
<span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1800</span>),
|
|||
|
|
],
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
<span class="comment">// Missing keys result in None
|
|||
|
|
</span><span class="kw">let </span>got = libraries.get_many_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"New York Public Library"</span>,
|
|||
|
|
]);
|
|||
|
|
<span class="macro">assert_eq!</span>(
|
|||
|
|
got,
|
|||
|
|
[
|
|||
|
|
<span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1807</span>),
|
|||
|
|
<span class="prelude-val">None
|
|||
|
|
</span>]
|
|||
|
|
);</code></pre></div>
|
|||
|
|
|
|||
|
|
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><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>libraries = HashMap::new();
|
|||
|
|
libraries.insert(<span class="string">"Athenæum"</span>.to_string(), <span class="number">1807</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Duplicate keys panic!
|
|||
|
|
</span><span class="kw">let </span>got = libraries.get_many_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_many_unchecked_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1592-1601">source</a><h4 class="code-header">pub unsafe fn <a href="#method.get_many_unchecked_mut" class="fn">get_many_unchecked_mut</a><Q, const N: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>>(
|
|||
|
|
&mut self,
|
|||
|
|
ks: [<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>],
|
|||
|
|
) -> [<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>]<div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Attempts to get mutable references to <code>N</code> values in the map at once, without validating that
|
|||
|
|
the values are unique.</p>
|
|||
|
|
<p>Returns an array of length <code>N</code> with the results of each query. <code>None</code> will be used if
|
|||
|
|
the key is missing.</p>
|
|||
|
|
<p>For a safe alternative see <a href="struct.HashMap.html#method.get_many_mut" title="method hashbrown::hash_map::HashMap::get_many_mut"><code>get_many_mut</code></a>.</p>
|
|||
|
|
<h5 id="safety"><a class="doc-anchor" href="#safety">§</a>Safety</h5>
|
|||
|
|
<p>Calling this method with overlapping keys is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em> even if the resulting
|
|||
|
|
references are not used.</p>
|
|||
|
|
<h5 id="examples-32"><a class="doc-anchor" href="#examples-32">§</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>libraries = HashMap::new();
|
|||
|
|
libraries.insert(<span class="string">"Bodleian Library"</span>.to_string(), <span class="number">1602</span>);
|
|||
|
|
libraries.insert(<span class="string">"Athenæum"</span>.to_string(), <span class="number">1807</span>);
|
|||
|
|
libraries.insert(<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="number">1691</span>);
|
|||
|
|
libraries.insert(<span class="string">"Library of Congress"</span>.to_string(), <span class="number">1800</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// SAFETY: The keys do not overlap.
|
|||
|
|
</span><span class="kw">let </span>[<span class="prelude-val">Some</span>(a), <span class="prelude-val">Some</span>(b)] = (<span class="kw">unsafe </span>{ libraries.get_many_unchecked_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
]) }) <span class="kw">else </span>{ <span class="macro">panic!</span>() };
|
|||
|
|
|
|||
|
|
<span class="comment">// SAFETY: The keys do not overlap.
|
|||
|
|
</span><span class="kw">let </span>got = <span class="kw">unsafe </span>{ libraries.get_many_unchecked_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"Library of Congress"</span>,
|
|||
|
|
]) };
|
|||
|
|
<span class="macro">assert_eq!</span>(
|
|||
|
|
got,
|
|||
|
|
[
|
|||
|
|
<span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1807</span>),
|
|||
|
|
<span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1800</span>),
|
|||
|
|
],
|
|||
|
|
);
|
|||
|
|
|
|||
|
|
<span class="comment">// SAFETY: The keys do not overlap.
|
|||
|
|
</span><span class="kw">let </span>got = <span class="kw">unsafe </span>{ libraries.get_many_unchecked_mut([
|
|||
|
|
<span class="string">"Athenæum"</span>,
|
|||
|
|
<span class="string">"New York Public Library"</span>,
|
|||
|
|
]) };
|
|||
|
|
<span class="comment">// Missing keys result in None
|
|||
|
|
</span><span class="macro">assert_eq!</span>(got, [<span class="prelude-val">Some</span>(<span class="kw-2">&mut </span><span class="number">1807</span>), <span class="prelude-val">None</span>]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_many_key_value_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1657-1666">source</a><h4 class="code-header">pub fn <a href="#method.get_many_key_value_mut" class="fn">get_many_key_value_mut</a><Q, const N: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>>(
|
|||
|
|
&mut self,
|
|||
|
|
ks: [<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>],
|
|||
|
|
) -> [<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>)>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>]<div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Attempts to get mutable references to <code>N</code> values in the map at once, with immutable
|
|||
|
|
references to the corresponding keys.</p>
|
|||
|
|
<p>Returns an array of length <code>N</code> with the results of each query. For soundness, at most one
|
|||
|
|
mutable reference will be returned to any value. <code>None</code> will be used if the key is missing.</p>
|
|||
|
|
<h5 id="panics-2"><a class="doc-anchor" href="#panics-2">§</a>Panics</h5>
|
|||
|
|
<p>Panics if any keys are overlapping.</p>
|
|||
|
|
<h5 id="examples-33"><a class="doc-anchor" href="#examples-33">§</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>libraries = HashMap::new();
|
|||
|
|
libraries.insert(<span class="string">"Bodleian Library"</span>.to_string(), <span class="number">1602</span>);
|
|||
|
|
libraries.insert(<span class="string">"Athenæum"</span>.to_string(), <span class="number">1807</span>);
|
|||
|
|
libraries.insert(<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="number">1691</span>);
|
|||
|
|
libraries.insert(<span class="string">"Library of Congress"</span>.to_string(), <span class="number">1800</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>got = libraries.get_many_key_value_mut([
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>,
|
|||
|
|
]);
|
|||
|
|
<span class="macro">assert_eq!</span>(
|
|||
|
|
got,
|
|||
|
|
[
|
|||
|
|
<span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="string">"Bodleian Library"</span>.to_string(), <span class="kw-2">&mut </span><span class="number">1602</span>)),
|
|||
|
|
<span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="kw-2">&mut </span><span class="number">1691</span>)),
|
|||
|
|
],
|
|||
|
|
);
|
|||
|
|
<span class="comment">// Missing keys result in None
|
|||
|
|
</span><span class="kw">let </span>got = libraries.get_many_key_value_mut([
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
<span class="string">"Gewandhaus"</span>,
|
|||
|
|
]);
|
|||
|
|
<span class="macro">assert_eq!</span>(got, [<span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="string">"Bodleian Library"</span>.to_string(), <span class="kw-2">&mut </span><span class="number">1602</span>)), <span class="prelude-val">None</span>]);</code></pre></div>
|
|||
|
|
|
|||
|
|
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><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>libraries = HashMap::new();
|
|||
|
|
libraries.insert(<span class="string">"Bodleian Library"</span>.to_string(), <span class="number">1602</span>);
|
|||
|
|
libraries.insert(<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="number">1691</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Duplicate keys result in panic!
|
|||
|
|
</span><span class="kw">let </span>got = libraries.get_many_key_value_mut([
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>,
|
|||
|
|
<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>,
|
|||
|
|
]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_many_key_value_unchecked_mut" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1718-1727">source</a><h4 class="code-header">pub unsafe fn <a href="#method.get_many_key_value_unchecked_mut" class="fn">get_many_key_value_unchecked_mut</a><Q, const N: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>>(
|
|||
|
|
&mut self,
|
|||
|
|
ks: [<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>],
|
|||
|
|
) -> [<a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>)>; <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.array.html">N</a>]<div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Attempts to get mutable references to <code>N</code> values in the map at once, with immutable
|
|||
|
|
references to the corresponding keys, without validating that the values are unique.</p>
|
|||
|
|
<p>Returns an array of length <code>N</code> with the results of each query. <code>None</code> will be returned if
|
|||
|
|
any of the keys are missing.</p>
|
|||
|
|
<p>For a safe alternative see <a href="struct.HashMap.html#method.get_many_key_value_mut" title="method hashbrown::hash_map::HashMap::get_many_key_value_mut"><code>get_many_key_value_mut</code></a>.</p>
|
|||
|
|
<h5 id="safety-1"><a class="doc-anchor" href="#safety-1">§</a>Safety</h5>
|
|||
|
|
<p>Calling this method with overlapping keys is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em> even if the resulting
|
|||
|
|
references are not used.</p>
|
|||
|
|
<h5 id="examples-34"><a class="doc-anchor" href="#examples-34">§</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>libraries = HashMap::new();
|
|||
|
|
libraries.insert(<span class="string">"Bodleian Library"</span>.to_string(), <span class="number">1602</span>);
|
|||
|
|
libraries.insert(<span class="string">"Athenæum"</span>.to_string(), <span class="number">1807</span>);
|
|||
|
|
libraries.insert(<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="number">1691</span>);
|
|||
|
|
libraries.insert(<span class="string">"Library of Congress"</span>.to_string(), <span class="number">1800</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>got = libraries.get_many_key_value_mut([
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
<span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>,
|
|||
|
|
]);
|
|||
|
|
<span class="macro">assert_eq!</span>(
|
|||
|
|
got,
|
|||
|
|
[
|
|||
|
|
<span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="string">"Bodleian Library"</span>.to_string(), <span class="kw-2">&mut </span><span class="number">1602</span>)),
|
|||
|
|
<span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="string">"Herzogin-Anna-Amalia-Bibliothek"</span>.to_string(), <span class="kw-2">&mut </span><span class="number">1691</span>)),
|
|||
|
|
],
|
|||
|
|
);
|
|||
|
|
<span class="comment">// Missing keys result in None
|
|||
|
|
</span><span class="kw">let </span>got = libraries.get_many_key_value_mut([
|
|||
|
|
<span class="string">"Bodleian Library"</span>,
|
|||
|
|
<span class="string">"Gewandhaus"</span>,
|
|||
|
|
]);
|
|||
|
|
<span class="macro">assert_eq!</span>(
|
|||
|
|
got,
|
|||
|
|
[
|
|||
|
|
<span class="prelude-val">Some</span>((<span class="kw-2">&</span><span class="string">"Bodleian Library"</span>.to_string(), <span class="kw-2">&mut </span><span class="number">1602</span>)),
|
|||
|
|
<span class="prelude-val">None</span>,
|
|||
|
|
],
|
|||
|
|
);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1788-1799">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(&mut self, k: K, v: V) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><V></h4></section></summary><div class="docblock"><p>Inserts a key-value pair into the map.</p>
|
|||
|
|
<p>If the map did not have this key present, <a href="https://doc.rust-lang.org/std/option/enum.Option.html#variant.None"><code>None</code></a> is returned.</p>
|
|||
|
|
<p>If the map did have this key present, the value is updated, and the old
|
|||
|
|
value is returned. The key is not updated, though; this matters for
|
|||
|
|
types that can be <code>==</code> without being identical. See the <a href="https://doc.rust-lang.org/std/collections/index.html"><code>std::collections</code></a>
|
|||
|
|
<a href="https://doc.rust-lang.org/std/collections/index.html#insert-and-complex-keys">module-level documentation</a> for more.</p>
|
|||
|
|
<h5 id="examples-35"><a class="doc-anchor" href="#examples-35">§</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::new();
|
|||
|
|
<span class="macro">assert_eq!</span>(map.insert(<span class="number">37</span>, <span class="string">"a"</span>), <span class="prelude-val">None</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.is_empty(), <span class="bool-val">false</span>);
|
|||
|
|
|
|||
|
|
map.insert(<span class="number">37</span>, <span class="string">"b"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map.insert(<span class="number">37</span>, <span class="string">"c"</span>), <span class="prelude-val">Some</span>(<span class="string">"b"</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(map[<span class="kw-2">&</span><span class="number">37</span>], <span class="string">"c"</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert_unique_unchecked" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1875-1882">source</a><h4 class="code-header">pub unsafe fn <a href="#method.insert_unique_unchecked" class="fn">insert_unique_unchecked</a>(&mut self, k: K, v: V) -> (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>)</h4></section></summary><div class="docblock"><p>Insert a key-value pair into the map without checking
|
|||
|
|
if the key already exists in the map.</p>
|
|||
|
|
<p>This operation is faster than regular insert, because it does not perform
|
|||
|
|
lookup before insertion.</p>
|
|||
|
|
<p>This operation is useful during initial population of the map.
|
|||
|
|
For example, when constructing a map from another map, we know
|
|||
|
|
that keys are unique.</p>
|
|||
|
|
<p>Returns a reference to the key and value just inserted.</p>
|
|||
|
|
<h5 id="safety-2"><a class="doc-anchor" href="#safety-2">§</a>Safety</h5>
|
|||
|
|
<p>This operation is safe if a key does not exist in the map.</p>
|
|||
|
|
<p>However, if a key exists in the map already, the behavior is unspecified:
|
|||
|
|
this operation may panic, loop forever, or any following operation with the map
|
|||
|
|
may panic, loop forever or return arbitrary result.</p>
|
|||
|
|
<p>That said, this operation (and following operations) are guaranteed to
|
|||
|
|
not violate memory safety.</p>
|
|||
|
|
<p>However this operation is still unsafe because the resulting <code>HashMap</code>
|
|||
|
|
may be passed to unsafe code which does expect the map to behave
|
|||
|
|
correctly, and would cause unsoundness as a result.</p>
|
|||
|
|
<h5 id="examples-36"><a class="doc-anchor" href="#examples-36">§</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>map1 = HashMap::new();
|
|||
|
|
<span class="macro">assert_eq!</span>(map1.insert(<span class="number">1</span>, <span class="string">"a"</span>), <span class="prelude-val">None</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map1.insert(<span class="number">2</span>, <span class="string">"b"</span>), <span class="prelude-val">None</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map1.insert(<span class="number">3</span>, <span class="string">"c"</span>), <span class="prelude-val">None</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map1.len(), <span class="number">3</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map2 = HashMap::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>(key, value) <span class="kw">in </span>map1.into_iter() {
|
|||
|
|
<span class="kw">unsafe </span>{
|
|||
|
|
map2.insert_unique_unchecked(key, value);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>(key, value) = <span class="kw">unsafe </span>{ map2.insert_unique_unchecked(<span class="number">4</span>, <span class="string">"d"</span>) };
|
|||
|
|
<span class="macro">assert_eq!</span>(key, <span class="kw-2">&</span><span class="number">4</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(value, <span class="kw-2">&mut </span><span class="string">"d"</span>);
|
|||
|
|
<span class="kw-2">*</span>value = <span class="string">"e"</span>;
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map2[<span class="kw-2">&</span><span class="number">1</span>], <span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map2[<span class="kw-2">&</span><span class="number">2</span>], <span class="string">"b"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map2[<span class="kw-2">&</span><span class="number">3</span>], <span class="string">"c"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map2[<span class="kw-2">&</span><span class="number">4</span>], <span class="string">"e"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map2.len(), <span class="number">4</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.try_insert" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1913-1922">source</a><h4 class="code-header">pub fn <a href="#method.try_insert" class="fn">try_insert</a>(
|
|||
|
|
&mut self,
|
|||
|
|
key: K,
|
|||
|
|
value: V,
|
|||
|
|
) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut V</a>, <a class="struct" href="struct.OccupiedError.html" title="struct hashbrown::hash_map::OccupiedError">OccupiedError</a><'_, K, V, S, A>></h4></section></summary><div class="docblock"><p>Tries to insert a key-value pair into the map, and returns
|
|||
|
|
a mutable reference to the value in the entry.</p>
|
|||
|
|
<h5 id="errors-1"><a class="doc-anchor" href="#errors-1">§</a>Errors</h5>
|
|||
|
|
<p>If the map already had this key present, nothing is updated, and
|
|||
|
|
an error containing the occupied entry and the value is returned.</p>
|
|||
|
|
<h5 id="examples-37"><a class="doc-anchor" href="#examples-37">§</a>Examples</h5>
|
|||
|
|
<p>Basic usage:</p>
|
|||
|
|
|
|||
|
|
<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::OccupiedError;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
|
|||
|
|
<span class="macro">assert_eq!</span>(map.try_insert(<span class="number">37</span>, <span class="string">"a"</span>).unwrap(), <span class="kw-2">&</span><span class="string">"a"</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">match </span>map.try_insert(<span class="number">37</span>, <span class="string">"b"</span>) {
|
|||
|
|
<span class="prelude-val">Err</span>(OccupiedError { entry, value }) => {
|
|||
|
|
<span class="macro">assert_eq!</span>(entry.key(), <span class="kw-2">&</span><span class="number">37</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(entry.get(), <span class="kw-2">&</span><span class="string">"a"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(value, <span class="string">"b"</span>);
|
|||
|
|
}
|
|||
|
|
<span class="kw">_ </span>=> <span class="macro">panic!</span>()
|
|||
|
|
}</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.remove" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1952-1961">source</a><h4 class="code-header">pub fn <a href="#method.remove" class="fn">remove</a><Q>(&mut self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><V><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Removes a key from the map, returning the value at the key if the key
|
|||
|
|
was previously in the map. Keeps the allocated memory for reuse.</p>
|
|||
|
|
<p>The key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-38"><a class="doc-anchor" href="#examples-38">§</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::new();
|
|||
|
|
<span class="comment">// The map is empty
|
|||
|
|
</span><span class="macro">assert!</span>(map.is_empty() && map.capacity() == <span class="number">0</span>);
|
|||
|
|
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.remove(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="string">"a"</span>));
|
|||
|
|
<span class="macro">assert_eq!</span>(map.remove(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">None</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Now map holds none elements
|
|||
|
|
</span><span class="macro">assert!</span>(map.is_empty());</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.remove_entry" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#1991-1997">source</a><h4 class="code-header">pub fn <a href="#method.remove_entry" class="fn">remove_entry</a><Q>(&mut self, k: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>><div class="where">where
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Removes a key from the map, returning the stored key and value if the
|
|||
|
|
key was previously in the map. Keeps the allocated memory for reuse.</p>
|
|||
|
|
<p>The key may be any borrowed form of the map’s key type, but
|
|||
|
|
<a href="https://doc.rust-lang.org/std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the key type.</p>
|
|||
|
|
<h5 id="examples-39"><a class="doc-anchor" href="#examples-39">§</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::new();
|
|||
|
|
<span class="comment">// The map is empty
|
|||
|
|
</span><span class="macro">assert!</span>(map.is_empty() && map.capacity() == <span class="number">0</span>);
|
|||
|
|
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="string">"a"</span>);
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map.remove_entry(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>((<span class="number">1</span>, <span class="string">"a"</span>)));
|
|||
|
|
<span class="macro">assert_eq!</span>(map.remove(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">None</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Now map hold none elements
|
|||
|
|
</span><span class="macro">assert!</span>(map.is_empty());</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.allocation_size" class="method"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2005-2007">source</a><h4 class="code-header">pub fn <a href="#method.allocation_size" class="fn">allocation_size</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the total amount of memory allocated internally by the hash
|
|||
|
|
set, in bytes.</p>
|
|||
|
|
<p>The returned number is informational only. It is intended to be
|
|||
|
|
primarily used for memory profiling.</p>
|
|||
|
|
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#190-204">source</a><a href="#impl-Clone-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>, A: Allocator + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#191-196">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> Self</h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#198-203">source</a><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: &Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2036-2045">source</a><a href="#impl-Debug-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>,
|
|||
|
|
A: Allocator,</div></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#2042-2044">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.82.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2047-2071">source</a><a href="#impl-Default-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a>,
|
|||
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> + Allocator,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2068-2070">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashMap<K, V, S, A></code>, with the <code>Default</code> value for the hasher and allocator.</p>
|
|||
|
|
<h5 id="examples-40"><a class="doc-anchor" href="#examples-40">§</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>std::collections::hash_map::RandomState;
|
|||
|
|
|
|||
|
|
<span class="comment">// You can specify all types of HashMap, including hasher and allocator.
|
|||
|
|
// Created map is empty and don't allocate memory
|
|||
|
|
</span><span class="kw">let </span>map: HashMap<u32, String> = Default::default();
|
|||
|
|
<span class="macro">assert_eq!</span>(map.capacity(), <span class="number">0</span>);
|
|||
|
|
<span class="kw">let </span>map: HashMap<u32, String, RandomState> = HashMap::default();
|
|||
|
|
<span class="macro">assert_eq!</span>(map.capacity(), <span class="number">0</span>);</code></pre></div>
|
|||
|
|
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C%26(K,+V)%3E-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4584-4640">source</a><a href="#impl-Extend%3C%26(K,+V)%3E-for-HashMap%3CK,+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/1.82.0/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a><&'a <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></summary><div class="docblock"><p>Inserts all new key-values from the iterator and replaces values with existing
|
|||
|
|
keys with new values returned from the iterator.</p>
|
|||
|
|
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend-2" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4625-4627">source</a><a href="#method.extend-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a><T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = &'a <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>>>(&mut self, iter: T)</h4></section></summary><div class="docblock"><p>Inserts all new key-values from the iterator to existing <code>HashMap<K, V, S, A></code>.
|
|||
|
|
Replace values with existing keys with new values returned from the iterator.
|
|||
|
|
The keys and values must implement <a href="https://doc.rust-lang.org/core/marker/trait.Copy.html"><code>Copy</code></a> trait.</p>
|
|||
|
|
<h5 id="examples-47"><a class="doc-anchor" href="#examples-47">§</a>Examples</h5>
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::hash_map::HashMap;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">100</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>arr = [(<span class="number">1</span>, <span class="number">1</span>), (<span class="number">2</span>, <span class="number">2</span>)];
|
|||
|
|
<span class="kw">let </span>some_iter = arr.iter();
|
|||
|
|
map.extend(some_iter);
|
|||
|
|
<span class="comment">// Replace values with existing keys with new values returned from the iterator.
|
|||
|
|
// So that the map.get(&1) doesn't return Some(&100).
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.get(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_vec: Vec<<span class="kw">_</span>> = <span class="macro">vec!</span>[(<span class="number">3</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">4</span>)];
|
|||
|
|
map.extend(<span class="kw-2">&</span>some_vec);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_arr = [(<span class="number">5</span>, <span class="number">5</span>), (<span class="number">6</span>, <span class="number">6</span>)];
|
|||
|
|
map.extend(<span class="kw-2">&</span>some_arr);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<<span class="kw">_</span>> = map.into_iter().collect();
|
|||
|
|
<span class="comment">// The `IntoIter` 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="number">1</span>, <span class="number">1</span>), (<span class="number">2</span>, <span class="number">2</span>), (<span class="number">3</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">4</span>), (<span class="number">5</span>, <span class="number">5</span>), (<span class="number">6</span>, <span class="number">6</span>)]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one-2" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#454">source</a><a href="#method.extend_one-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve-2" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#462">source</a><a href="#method.extend_reserve-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C(%26K,+%26V)%3E-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4519-4580">source</a><a href="#impl-Extend%3C(%26K,+%26V)%3E-for-HashMap%3CK,+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/1.82.0/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a><(<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a V</a>)> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></summary><div class="docblock"><p>Inserts all new key-values from the iterator and replaces values with existing
|
|||
|
|
keys with new values returned from the iterator.</p>
|
|||
|
|
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend-1" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4565-4567">source</a><a href="#method.extend-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a><T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a V</a>)>>(&mut self, iter: T)</h4></section></summary><div class="docblock"><p>Inserts all new key-values from the iterator to existing <code>HashMap<K, V, S, A></code>.
|
|||
|
|
Replace values with existing keys with new values returned from the iterator.
|
|||
|
|
The keys and values must implement <a href="https://doc.rust-lang.org/core/marker/trait.Copy.html"><code>Copy</code></a> trait.</p>
|
|||
|
|
<h5 id="examples-46"><a class="doc-anchor" href="#examples-46">§</a>Examples</h5>
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::hash_map::HashMap;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">100</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>arr = [(<span class="number">1</span>, <span class="number">1</span>), (<span class="number">2</span>, <span class="number">2</span>)];
|
|||
|
|
<span class="kw">let </span>some_iter = arr.iter().map(|(k, v)| (k, v));
|
|||
|
|
map.extend(some_iter);
|
|||
|
|
<span class="comment">// Replace values with existing keys with new values returned from the iterator.
|
|||
|
|
// So that the map.get(&1) doesn't return Some(&100).
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.get(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_vec: Vec<<span class="kw">_</span>> = <span class="macro">vec!</span>[(<span class="number">3</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">4</span>)];
|
|||
|
|
map.extend(some_vec.iter().map(|(k, v)| (k, v)));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_arr = [(<span class="number">5</span>, <span class="number">5</span>), (<span class="number">6</span>, <span class="number">6</span>)];
|
|||
|
|
map.extend(some_arr.iter().map(|(k, v)| (k, v)));
|
|||
|
|
|
|||
|
|
<span class="comment">// You can also extend from another HashMap
|
|||
|
|
</span><span class="kw">let </span><span class="kw-2">mut </span>new_map = HashMap::new();
|
|||
|
|
new_map.extend(<span class="kw-2">&</span>map);
|
|||
|
|
<span class="macro">assert_eq!</span>(new_map, map);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<<span class="kw">_</span>> = new_map.into_iter().collect();
|
|||
|
|
<span class="comment">// The `IntoIter` 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="number">1</span>, <span class="number">1</span>), (<span class="number">2</span>, <span class="number">2</span>), (<span class="number">3</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">4</span>), (<span class="number">5</span>, <span class="number">5</span>), (<span class="number">6</span>, <span class="number">6</span>)]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#454">source</a><a href="#method.extend_one-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#462">source</a><a href="#method.extend_reserve-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C(K,+V)%3E-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4436-4515">source</a><a href="#impl-Extend%3C(K,+V)%3E-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></summary><div class="docblock"><p>Inserts all new key-values from the iterator and replaces values with existing
|
|||
|
|
keys with new values returned from the iterator.</p>
|
|||
|
|
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4478-4493">source</a><a href="#method.extend" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a><T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>>>(&mut self, iter: T)</h4></section></summary><div class="docblock"><p>Inserts all new key-values from the iterator to existing <code>HashMap<K, V, S, A></code>.
|
|||
|
|
Replace values with existing keys with new values returned from the iterator.</p>
|
|||
|
|
<h5 id="examples-45"><a class="doc-anchor" href="#examples-45">§</a>Examples</h5>
|
|||
|
|
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::hash_map::HashMap;
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
|
|||
|
|
map.insert(<span class="number">1</span>, <span class="number">100</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_iter = [(<span class="number">1</span>, <span class="number">1</span>), (<span class="number">2</span>, <span class="number">2</span>)].into_iter();
|
|||
|
|
map.extend(some_iter);
|
|||
|
|
<span class="comment">// Replace values with existing keys with new values returned from the iterator.
|
|||
|
|
// So that the map.get(&1) doesn't return Some(&100).
|
|||
|
|
</span><span class="macro">assert_eq!</span>(map.get(<span class="kw-2">&</span><span class="number">1</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_vec: Vec<<span class="kw">_</span>> = <span class="macro">vec!</span>[(<span class="number">3</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">4</span>)];
|
|||
|
|
map.extend(some_vec);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span>some_arr = [(<span class="number">5</span>, <span class="number">5</span>), (<span class="number">6</span>, <span class="number">6</span>)];
|
|||
|
|
map.extend(some_arr);
|
|||
|
|
<span class="kw">let </span>old_map_len = map.len();
|
|||
|
|
|
|||
|
|
<span class="comment">// You can also extend from another HashMap
|
|||
|
|
</span><span class="kw">let </span><span class="kw-2">mut </span>new_map = HashMap::new();
|
|||
|
|
new_map.extend(map);
|
|||
|
|
<span class="macro">assert_eq!</span>(new_map.len(), old_map_len);
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<<span class="kw">_</span>> = new_map.into_iter().collect();
|
|||
|
|
<span class="comment">// The `IntoIter` 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="number">1</span>, <span class="number">1</span>), (<span class="number">2</span>, <span class="number">2</span>), (<span class="number">3</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">4</span>), (<span class="number">5</span>, <span class="number">5</span>), (<span class="number">6</span>, <span class="number">6</span>)]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#454">source</a><a href="#method.extend_one" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/iter/traits/collect.rs.html#462">source</a><a href="#method.extend_reserve" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CHashMap%3CT,+(),+S,+A%3E%3E-for-HashSet%3CT,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/set.rs.html#1254-1261">source</a><a href="#impl-From%3CHashMap%3CT,+(),+S,+A%3E%3E-for-HashSet%3CT,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<T, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><T, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.unit.html">()</a>, S, A>> for <a class="struct" href="../hash_set/struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><div class="where">where
|
|||
|
|
A: Allocator,</div></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="../../src/hashbrown/set.rs.html#1258-1260">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(map: <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><T, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.unit.html">()</a>, S, A>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-FromIterator%3C(K,+V)%3E-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4416-4432">source</a><a href="#impl-FromIterator%3C(K,+V)%3E-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.FromIterator.html" title="trait core::iter::traits::collect::FromIterator">FromIterator</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a>,
|
|||
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> + Allocator,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from_iter" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#4423-4431">source</a><a href="#method.from_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter" class="fn">from_iter</a><T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a><Item = <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a>>>(iter: T) -> Self</h4></section></summary><div class='docblock'>Creates a value from an iterator. <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Index%3C%26Q%3E-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2073-2102">source</a><a href="#impl-Index%3C%26Q%3E-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, Q, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
|
|||
|
|
Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.index" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2099-2101">source</a><a href="#method.index" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html#tymethod.index" class="fn">index</a>(&self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Q</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&V</a></h4></section></summary><div class="docblock"><p>Returns a reference to the value corresponding to the supplied key.</p>
|
|||
|
|
<h5 id="panics-3"><a class="doc-anchor" href="#panics-3">§</a>Panics</h5>
|
|||
|
|
<p>Panics if the key is not present in the <code>HashMap</code>.</p>
|
|||
|
|
<h5 id="examples-41"><a class="doc-anchor" href="#examples-41">§</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>map: HashMap<<span class="kw">_</span>, <span class="kw">_</span>> = [(<span class="string">"a"</span>, <span class="string">"One"</span>), (<span class="string">"b"</span>, <span class="string">"Two"</span>)].into();
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map[<span class="kw-2">&</span><span class="string">"a"</span>], <span class="string">"One"</span>);
|
|||
|
|
<span class="macro">assert_eq!</span>(map[<span class="kw-2">&</span><span class="string">"b"</span>], <span class="string">"Two"</span>);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle" open><summary><section id="associatedtype.Output" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2080">source</a><a href="#associatedtype.Output" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/ops/index/trait.Index.html#associatedtype.Output" class="associatedtype">Output</a> = V</h4></section></summary><div class='docblock'>The returned type after indexing.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3057-3087">source</a><a href="#impl-IntoIterator-for-%26HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<'a, K, V, S, A: Allocator> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &'a <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into_iter" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3084-3086">source</a><a href="#method.into_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -> <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_map::Iter">Iter</a><'a, K, V> <a href="#" class="tooltip" data-notable-ty="Iter<'a, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>Creates an iterator over the entries of a <code>HashMap</code> in arbitrary order.
|
|||
|
|
The iterator element type is <code>(&'a K, &'a V)</code>.</p>
|
|||
|
|
<p>Return the same <code>Iter</code> struct as by the <a href="struct.HashMap.html#method.iter"><code>iter</code></a> method on <a href="struct.HashMap.html"><code>HashMap</code></a>.</p>
|
|||
|
|
<h5 id="examples-42"><a class="doc-anchor" href="#examples-42">§</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>map_one: HashMap<<span class="kw">_</span>, <span class="kw">_</span>> = [(<span class="number">1</span>, <span class="string">"a"</span>), (<span class="number">2</span>, <span class="string">"b"</span>), (<span class="number">3</span>, <span class="string">"c"</span>)].into();
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>map_two = HashMap::new();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>(key, value) <span class="kw">in </span><span class="kw-2">&</span>map_one {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"Key: {}, Value: {}"</span>, key, value);
|
|||
|
|
map_two.insert(<span class="kw-2">*</span>key, <span class="kw-2">*</span>value);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq!</span>(map_one, map_two);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle" open><summary><section id="associatedtype.Item" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3058">source</a><a href="#associatedtype.Item" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a V</a>)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3059">source</a><a href="#associatedtype.IntoIter" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_map::Iter">Iter</a><'a, K, V></h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26mut+HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3089-3124">source</a><a href="#impl-IntoIterator-for-%26mut+HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<'a, K, V, S, A: Allocator> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &'a mut <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into_iter-1" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3121-3123">source</a><a href="#method.into_iter-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -> <a class="struct" href="struct.IterMut.html" title="struct hashbrown::hash_map::IterMut">IterMut</a><'a, K, V> <a href="#" class="tooltip" data-notable-ty="IterMut<'a, K, V>">ⓘ</a></h4></section></summary><div class="docblock"><p>Creates an iterator over the entries of a <code>HashMap</code> in arbitrary order
|
|||
|
|
with mutable references to the values. The iterator element type is
|
|||
|
|
<code>(&'a K, &'a mut V)</code>.</p>
|
|||
|
|
<p>Return the same <code>IterMut</code> struct as by the <a href="struct.HashMap.html#method.iter_mut"><code>iter_mut</code></a> method on
|
|||
|
|
<a href="struct.HashMap.html"><code>HashMap</code></a>.</p>
|
|||
|
|
<h5 id="examples-43"><a class="doc-anchor" href="#examples-43">§</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">_</span>, <span class="kw">_</span>> = [(<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>)].into();
|
|||
|
|
|
|||
|
|
<span class="kw">for </span>(key, value) <span class="kw">in </span><span class="kw-2">&mut </span>map {
|
|||
|
|
<span class="macro">println!</span>(<span class="string">"Key: {}, Value: {}"</span>, key, value);
|
|||
|
|
<span class="kw-2">*</span>value <span class="kw-2">*</span>= <span class="number">2</span>;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="kw">let </span><span class="kw-2">mut </span>vec = map.iter().collect::<Vec<<span class="kw">_</span>>>();
|
|||
|
|
<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="kw-2">&</span><span class="string">"a"</span>, <span class="kw-2">&</span><span class="number">2</span>), (<span class="kw-2">&</span><span class="string">"b"</span>, <span class="kw-2">&</span><span class="number">4</span>), (<span class="kw-2">&</span><span class="string">"c"</span>, <span class="kw-2">&</span><span class="number">6</span>)]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle" open><summary><section id="associatedtype.Item-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3090">source</a><a href="#associatedtype.Item-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (<a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a K</a>, <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&'a mut V</a>)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3091">source</a><a href="#associatedtype.IntoIter-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.IterMut.html" title="struct hashbrown::hash_map::IterMut">IterMut</a><'a, K, V></h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3126-3154">source</a><a href="#impl-IntoIterator-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A: Allocator> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into_iter-2" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3149-3153">source</a><a href="#method.into_iter-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -> <a class="struct" href="struct.IntoIter.html" title="struct hashbrown::hash_map::IntoIter">IntoIter</a><K, V, A> <a href="#" class="tooltip" data-notable-ty="IntoIter<K, V, A>">ⓘ</a></h4></section></summary><div class="docblock"><p>Creates a consuming iterator, that is, one that moves each key-value
|
|||
|
|
pair out of the map in arbitrary order. The map cannot be used after
|
|||
|
|
calling this.</p>
|
|||
|
|
<h5 id="examples-44"><a class="doc-anchor" href="#examples-44">§</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>map: HashMap<<span class="kw">_</span>, <span class="kw">_</span>> = [(<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>)].into();
|
|||
|
|
|
|||
|
|
<span class="comment">// Not possible with .iter()
|
|||
|
|
</span><span class="kw">let </span><span class="kw-2">mut </span>vec: Vec<(<span class="kw-2">&</span>str, i32)> = map.into_iter().collect();
|
|||
|
|
<span class="comment">// The `IntoIter` 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">1</span>), (<span class="string">"b"</span>, <span class="number">2</span>), (<span class="string">"c"</span>, <span class="number">3</span>)]);</code></pre></div>
|
|||
|
|
</div></details><details class="toggle" open><summary><section id="associatedtype.Item-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3127">source</a><a href="#associatedtype.Item-2" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html">(K, V)</a></h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#3128">source</a><a href="#associatedtype.IntoIter-2" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.IntoIter.html" title="struct hashbrown::hash_map::IntoIter">IntoIter</a><K, V, A></h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2010-2025">source</a><a href="#impl-PartialEq-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2017-2024">source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">eq</a>(&self, other: &Self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.82.0/src/core/cmp.rs.html#261">source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&Rhs</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>!=</code>. The default implementation is almost always sufficient,
|
|||
|
|
and should not be overridden without very good reason.</div></details></div></details><section id="impl-Eq-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a class="src rightside" href="../../src/hashbrown/map.rs.html#2027-2034">source</a><a href="#impl-Eq-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>,
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,
|
|||
|
|
A: Allocator,</div></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a href="#impl-Freeze-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a>,
|
|||
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a>,</div></h3></section><section id="impl-RefUnwindSafe-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a href="#impl-RefUnwindSafe-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/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/1.82.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a href="#impl-Send-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
|
|||
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a href="#impl-Sync-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
|||
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a href="#impl-Unpin-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
|
|||
|
|
S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
|
|||
|
|
A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
|
|||
|
|
K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,
|
|||
|
|
V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-HashMap%3CK,+V,+S,+A%3E" class="impl"><a href="#impl-UnwindSafe-for-HashMap%3CK,+V,+S,+A%3E" class="anchor">§</a><h3 class="code-header">impl<K, V, S, A> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><K, V, S, A><div class="where">where
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S: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
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A: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
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K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,
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V: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,</div></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/1.82.0/src/core/any.rs.html#138">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/1.82.0/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/1.82.0/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/1.82.0/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/1.82.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/src/core/borrow.rs.html#209">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/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/1.82.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/src/core/borrow.rs.html#217">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-CloneToUninit-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/clone.rs.html#273">source</a><a href="#impl-CloneToUninit-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.CloneToUninit.html" title="trait core::clone::CloneToUninit">CloneToUninit</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone_to_uninit" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/clone.rs.html#275">source</a><a href="#method.clone_to_uninit" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit" class="fn">clone_to_uninit</a>(&self, dst: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.pointer.html">*mut T</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>clone_to_uninit</code>)</span></div></span><div class='docblock'>Performs copy-assignment from <code>self</code> to <code>dst</code>. <a href="https://doc.rust-lang.org/1.82.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Equivalent%3CK%3E-for-Q" class="impl"><a class="src rightside" href="../../src/hashbrown/lib.rs.html#155-163">source</a><a href="#impl-Equivalent%3CK%3E-for-Q" class="anchor">§</a><h3 class="code-header">impl<Q, K> <a class="trait" href="../trait.Equivalent.html" title="trait hashbrown::Equivalent">Equivalent</a><K> for Q<div class="where">where
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Q: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
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K: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><Q> + ?<a class="trait" href="https://doc.rust-lang.org/1.82.0/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.equivalent" class="method trait-impl"><a class="src rightside" href="../../src/hashbrown/lib.rs.html#160-162">source</a><a href="#method.equivalent" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.Equivalent.html#tymethod.equivalent" class="fn">equivalent</a>(&self, key: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&K</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Checks if this value is equivalent to the given key. <a href="../trait.Equivalent.html#tymethod.equivalent">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/1.82.0/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/1.82.0/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-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/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>
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</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/1.82.0/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/1.82.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/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
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<code><a href="https://doc.rust-lang.org/1.82.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#82-84">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#86">source</a><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#87">source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/src/alloc/borrow.rs.html#91">source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.82.0/core/primitive.reference.html">&mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.82.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></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/1.82.0/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/1.82.0/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/1.82.0/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-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/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/1.82.0/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" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/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/1.82.0/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/1.82.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.82.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.82.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.82.0/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><script type="text/json" id="notable-traits-data">{"Drain<'_, K, V, A>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Drain.html\" title=\"struct hashbrown::hash_map::Drain\">Drain</a><'a, K, V, A></code></h3><pre><code><div class=\"where\">impl<'a, K, V, A: Allocator> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Drain.html\" title=\"struct hashbrown::hash_map::Drain\">Drain</a><'a, K, V, A></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.82.0/core/primitive.tuple.html\">(K, V)</a>;</div>","ExtractIf<'_, K, V, F, A>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.ExtractIf.html\" title=\"struct hashbrown::hash_map::ExtractIf\">ExtractIf</a><'_, K, V, F, A></code></h3><pre><code><div class=\"where\">impl<K, V, F, A> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.82.0/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.ExtractIf.html\" title=\"struct hashbrown::hash_map::ExtractIf\">ExtractIf</a><'_, K, V, F, A><div class=\"where\">where\n F: <a class=\"trait\" href=\"https://doc.rust-lang.org/1.82.0/core/ops/function/trait.FnMut.html\" title=\"trait core::ops::function::FnMut\">FnMut</a>(<a class=\"primitive\" href=\"https://doc.rust-lang.org/1.82.0/core/primitive.reference.html\">&K</a>, <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.82.0/core/primitive.reference.html\">&mut V</a>) -> <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.82.0/core/primitive.bool.html\">bool</a>,\n A: Allocator,</div></div><div cla
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