| <!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 set implemented as a `HashMap` where the value is `()`."><meta name="keywords" content="rust, rustlang, rust-lang, HashSet"><title>HashSet in hashbrown::hash_set - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin 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class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../hashbrown/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../hashbrown/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">HashSet</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block"><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">contains</a></li><li><a href="#method.difference">difference</a></li><li><a href="#method.drain">drain</a></li><li><a href="#method.drain_filter">drain_filter</a></li><li><a href="#method.entry">entry</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_or_insert">get_or_insert</a></li><li><a href="#method.get_or_insert_owned">get_or_insert_owned</a></li><li><a href="#method.get_or_insert_with">get_or_insert_with</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.intersection">intersection</a></li><li><a href="#method.is_disjoint">is_disjoint</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.is_subset">is_subset</a></li><li><a href="#method.is_superset">is_superset</a></li><li><a href="#method.iter">iter</a></li><li><a href="#method.len">len</a></li><li><a href="#method.remove">remove</a></li><li><a href="#method.replace">replace</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.symmetric_difference">symmetric_difference</a></li><li><a href="#method.take">take</a></li><li><a href="#method.try_reserve">try_reserve</a></li><li><a href="#method.union">union</a></li><li><a href="#method.with_capacity_and_hasher">with_capacity_and_hasher</a></li><li><a href="#method.with_capacity_and_hasher_in">with_capacity_and_hasher_in</a></li><li><a href="#method.with_hasher">with_hasher</a></li><li><a href="#method.with_hasher_in">with_hasher_in</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-BitAnd%3C%26HashSet%3CT%2C%20S%2C%20A%3E%3E-for-%26HashSet%3CT%2C%20S%2C%20A%3E">BitAnd<&HashSet<T, S, A>></a></li><li><a href="#impl-BitOr%3C%26HashSet%3CT%2C%20S%2C%20A%3E%3E-for-%26HashSet%3CT%2C%20S%2C%20A%3E">BitOr<&HashSet<T, S, A>></a></li><li><a href="#impl-BitXor%3C%26HashSet%3CT%2C%20S%2C%20Global%3E%3E-for-%26HashSet%3CT%2C%20S%3E">BitXor<&HashSet<T, S, Global>></a></li><li><a href="#impl-Clone-for-HashSet%3CT%2C%20S%2C%20A%3E">Clone</a></li><li><a href="#impl-Debug-for-HashSet%3CT%2C%20S%2C%20A%3E">Debug</a></li><li><a href="#impl-Default-for-HashSet%3CT%2C%20S%2C%20A%3E">Default</a></li><li><a href="#impl-Eq-for-HashSet%3CT%2C%20S%2C%20A%3E">Eq</a></li><li><a href="#impl-Extend%3C%26%27a%20T%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">Extend<&'a T></a></li><li><a href="#impl-Extend%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">Extend<T></a></li><li><a href="#impl-From%3CHashMap%3CT%2C%20()%2C%20S%2C%20A%3E%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">From<HashMap<T, (), S, A>></a></li><li><a href="#impl-FromIterator%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">FromIterator<T></a></li><li><a href="#impl-IntoIterator-for-%26%27a%20HashSet%3CT%2C%20S%2C%20A%3E">IntoIterator</a></li><li><a href="#impl-IntoIterator-for-HashSet%3CT%2C%20S%2C%20A%3E">IntoIterator</a></li><li><a href="#impl-PartialEq%3CHashSet%3CT%2C%20S%2C%20A%3E%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">PartialEq<HashSet<T, S, A>></a></li><li><a href="#impl-Sub%3C%26HashSet%3CT%2C%20S%2C%20Global%3E%3E-for-%26HashSet%3CT%2C%20S%3E">Sub<&HashSet<T, S, Global>></a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block"><li><a href="#impl-RefUnwindSafe-for-HashSet%3CT%2C%20S%2C%20A%3E">RefUnwindSafe</a></li><li><a href="#impl-Send-for-HashSet%3CT%2C%20S%2C%20A%3E">Send</a></li><li><a href="#impl-Sync-for-HashSet%3CT%2C%20S%2C%20A%3E">Sync</a></li><li><a href="#impl-Unpin-for-HashSet%3CT%2C%20S%2C%20A%3E">Unpin</a></li><li><a href="#impl-UnwindSafe-for-HashSet%3CT%2C%20S%2C%20A%3E">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block"><li><a href="#impl-Any-for-HashSet%3CT%2C%20S%2C%20A%3E">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">Into<U></a></li><li><a href="#impl-ToOwned-for-HashSet%3CT%2C%20S%2C%20A%3E">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E">TryInto<U></a></li></ul></section><h2><a href="index.html">In hashbrown::hash_set</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Struct <a href="../index.html">hashbrown</a>::<wbr><a href="index.html">hash_set</a>::<wbr><a class="struct" href="#">HashSet</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../src/hashbrown/set.rs.html#115-117">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust struct"><code>pub struct HashSet<T, S = <a class="enum" href="../hash_map/enum.DefaultHashBuilder.html" title="enum hashbrown::hash_map::DefaultHashBuilder">DefaultHashBuilder</a>, A: Allocator + Clone = Global> { /* private fields */ }</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A hash set implemented as a <code>HashMap</code> where the value is <code>()</code>.</p> |
| <p>As with the <a href="struct.HashMap.html"><code>HashMap</code></a> type, a <code>HashSet</code> requires that the elements |
| 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. This can frequently be achieved by |
| using <code>#[derive(PartialEq, Eq, Hash)]</code>. If you implement these yourself, |
| it is important that the following property holds:</p> |
| <div class="example-wrap"><pre class="language-text"><code>k1 == k2 -> hash(k1) == hash(k2)</code></pre></div> |
| <p>In other words, if two keys are equal, their hashes must be equal.</p> |
| <p>It is a logic error for an item to be modified in such a way that the |
| item’s 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 the <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a> trait, changes while it is in the set. This is |
| normally only 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> |
| <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. |
| This is generally only possible if the trait is implemented manually. If a |
| panic does occur then the contents of the <code>HashSet</code> may become corrupted and |
| some items may be dropped from the table.</p> |
| <h2 id="examples"><a href="#examples">Examples</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="comment">// Type inference lets us omit an explicit type signature (which |
| // would be `HashSet<String>` in this example). |
| </span><span class="kw">let </span><span class="kw-2">mut </span>books = HashSet::new(); |
| |
| <span class="comment">// Add some books. |
| </span>books.insert(<span class="string">"A Dance With Dragons"</span>.to_string()); |
| books.insert(<span class="string">"To Kill a Mockingbird"</span>.to_string()); |
| books.insert(<span class="string">"The Odyssey"</span>.to_string()); |
| books.insert(<span class="string">"The Great Gatsby"</span>.to_string()); |
| |
| <span class="comment">// Check for a specific one. |
| </span><span class="kw">if </span>!books.contains(<span class="string">"The Winds of Winter"</span>) { |
| <span class="macro">println!</span>(<span class="string">"We have {} books, but The Winds of Winter ain't one."</span>, |
| books.len()); |
| } |
| |
| <span class="comment">// Remove a book. |
| </span>books.remove(<span class="string">"The Odyssey"</span>); |
| |
| <span class="comment">// Iterate over everything. |
| </span><span class="kw">for </span>book <span class="kw">in </span><span class="kw-2">&</span>books { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, book); |
| }</code></pre></div> |
| <p>The easiest way to use <code>HashSet</code> with a custom 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>. We must also derive <a href="https://doc.rust-lang.org/std/cmp/trait.PartialEq.html"><code>PartialEq</code></a>. This will in the |
| future be implied by <a href="https://doc.rust-lang.org/std/cmp/trait.Eq.html"><code>Eq</code></a>.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="attribute">#[derive(Hash, Eq, PartialEq, Debug)] |
| </span><span class="kw">struct </span>Viking { |
| name: String, |
| power: usize, |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>vikings = HashSet::new(); |
| |
| vikings.insert(Viking { name: <span class="string">"Einar"</span>.to_string(), power: <span class="number">9 </span>}); |
| vikings.insert(Viking { name: <span class="string">"Einar"</span>.to_string(), power: <span class="number">9 </span>}); |
| vikings.insert(Viking { name: <span class="string">"Olaf"</span>.to_string(), power: <span class="number">4 </span>}); |
| vikings.insert(Viking { name: <span class="string">"Harald"</span>.to_string(), power: <span class="number">8 </span>}); |
| |
| <span class="comment">// Use derived implementation to print the vikings. |
| </span><span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&</span>vikings { |
| <span class="macro">println!</span>(<span class="string">"{:?}"</span>, x); |
| }</code></pre></div> |
| <p>A <code>HashSet</code> with fixed list of elements can be initialized from an array:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>viking_names: HashSet<<span class="kw-2">&</span><span class="lifetime">'static </span>str> = |
| [ <span class="string">"Einar"</span>, <span class="string">"Olaf"</span>, <span class="string">"Harald" </span>].iter().cloned().collect(); |
| <span class="comment">// use the values stored in the set</span></code></pre></div> |
| </div></details><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><div id="implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#211-383">source</a><a href="#impl-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A: Allocator + Clone> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.capacity" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#222-224">source</a><h4 class="code-header">pub fn <a href="#method.capacity" class="fnname">capacity</a>(&self) -> usize</h4></section></summary><div class="docblock"><p>Returns the number of elements the set can hold without reallocating.</p> |
| <h5 id="examples-1"><a href="#examples-1">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span>set: HashSet<i32> = HashSet::with_capacity(<span class="number">100</span>); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">100</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.iter" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#243-247">source</a><h4 class="code-header">pub fn <a href="#method.iter" class="fnname">iter</a>(&self) -> <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'_, T><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'a, K></span><code class="content"><span class="where fmt-newline">impl<'a, K> Iterator for <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'a, K></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = &'a K;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>An iterator visiting all elements in arbitrary order. |
| The iterator element type is <code>&'a T</code>.</p> |
| <h5 id="examples-2"><a href="#examples-2">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| set.insert(<span class="string">"a"</span>); |
| set.insert(<span class="string">"b"</span>); |
| |
| <span class="comment">// Will print in an arbitrary order. |
| </span><span class="kw">for </span>x <span class="kw">in </span>set.iter() { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, x); |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.len" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#262-264">source</a><h4 class="code-header">pub fn <a href="#method.len" class="fnname">len</a>(&self) -> usize</h4></section></summary><div class="docblock"><p>Returns the number of elements in the set.</p> |
| <h5 id="examples-3"><a href="#examples-3">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>v = HashSet::new(); |
| <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>); |
| v.insert(<span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(v.len(), <span class="number">1</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_empty" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#279-281">source</a><h4 class="code-header">pub fn <a href="#method.is_empty" class="fnname">is_empty</a>(&self) -> bool</h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the set contains no elements.</p> |
| <h5 id="examples-4"><a href="#examples-4">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>v = HashSet::new(); |
| <span class="macro">assert!</span>(v.is_empty()); |
| v.insert(<span class="number">1</span>); |
| <span class="macro">assert!</span>(!v.is_empty());</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.drain" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#301-305">source</a><h4 class="code-header">pub fn <a href="#method.drain" class="fnname">drain</a>(&mut self) -> <a class="struct" href="struct.Drain.html" title="struct hashbrown::hash_set::Drain">Drain</a><'_, T, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Drain.html" title="struct hashbrown::hash_set::Drain">Drain</a><'_, K, A></span><code class="content"><span class="where fmt-newline">impl<K, A: Allocator + Clone> Iterator for <a class="struct" href="struct.Drain.html" title="struct hashbrown::hash_set::Drain">Drain</a><'_, K, A></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = K;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Clears the set, returning all elements in an iterator.</p> |
| <h5 id="examples-5"><a href="#examples-5">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="macro">assert!</span>(!set.is_empty()); |
| |
| <span class="comment">// print 1, 2, 3 in an arbitrary order |
| </span><span class="kw">for </span>i <span class="kw">in </span>set.drain() { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, i); |
| } |
| |
| <span class="macro">assert!</span>(set.is_empty());</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.retain" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#321-326">source</a><h4 class="code-header">pub fn <a href="#method.retain" class="fnname">retain</a><F>(&mut self, f: F)<span class="where fmt-newline">where<br> F: FnMut(&T) -> bool,</span></h4></section></summary><div class="docblock"><p>Retains only the elements specified by the predicate.</p> |
| <p>In other words, remove all elements <code>e</code> such that <code>f(&e)</code> returns <code>false</code>.</p> |
| <h5 id="examples-6"><a href="#examples-6">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>xs = [<span class="number">1</span>,<span class="number">2</span>,<span class="number">3</span>,<span class="number">4</span>,<span class="number">5</span>,<span class="number">6</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<i32> = xs.iter().cloned().collect(); |
| set.retain(|<span class="kw-2">&</span>k| k % <span class="number">2 </span>== <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">3</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.drain_filter" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#354-365">source</a><h4 class="code-header">pub fn <a href="#method.drain_filter" class="fnname">drain_filter</a><F>(&mut self, f: F) -> <a class="struct" href="struct.DrainFilter.html" title="struct hashbrown::hash_set::DrainFilter">DrainFilter</a><'_, T, F, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.DrainFilter.html" title="struct hashbrown::hash_set::DrainFilter">DrainFilter</a><'_, K, F, A></span><code class="content"><span class="where fmt-newline">impl<K, F, A: Allocator + Clone> Iterator for <a class="struct" href="struct.DrainFilter.html" title="struct hashbrown::hash_set::DrainFilter">DrainFilter</a><'_, K, F, A><span class="where fmt-newline">where<br> F: FnMut(&K) -> bool,</span></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = K;</span></code></span></span></span></span><span class="where fmt-newline">where<br> F: FnMut(&T) -> bool,</span></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 elements <code>e</code> such that <code>f(&e)</code> returns <code>true</code> out |
| into another iterator.</p> |
| <p>When the returned DrainedFilter is dropped, any remaining elements that satisfy |
| the predicate are dropped from the set.</p> |
| <h5 id="examples-7"><a href="#examples-7">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<i32> = (<span class="number">0</span>..<span class="number">8</span>).collect(); |
| <span class="kw">let </span>drained: HashSet<i32> = set.drain_filter(|v| v % <span class="number">2 </span>== <span class="number">0</span>).collect(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>evens = drained.into_iter().collect::<Vec<<span class="kw">_</span>>>(); |
| <span class="kw">let </span><span class="kw-2">mut </span>odds = set.into_iter().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>]);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.clear" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#380-382">source</a><h4 class="code-header">pub fn <a href="#method.clear" class="fnname">clear</a>(&mut self)</h4></section></summary><div class="docblock"><p>Clears the set, removing all values.</p> |
| <h5 id="examples-8"><a href="#examples-8">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>v = HashSet::new(); |
| v.insert(<span class="number">1</span>); |
| v.clear(); |
| <span class="macro">assert!</span>(v.is_empty());</code></pre></div> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-HashSet%3CT%2C%20S%2C%20Global%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#385-451">source</a><a href="#impl-HashSet%3CT%2C%20S%2C%20Global%3E" class="anchor"></a><h3 class="code-header">impl<T, S> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.with_hasher" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#413-417">source</a><h4 class="code-header">pub const fn <a href="#method.with_hasher" class="fnname">with_hasher</a>(hasher: S) -> Self</h4></section></summary><div class="docblock"><p>Creates a new empty hash set which will use the given hasher to hash |
| keys.</p> |
| <p>The hash set is also created with the default initial capacity.</p> |
| <p>Warning: <code>hasher</code> is normally randomly generated, and |
| is designed to allow <code>HashSet</code>s to be resistant to attacks that |
| cause many collisions and very poor performance. Setting it |
| manually using this function can expose a DoS attack vector.</p> |
| <p>The <code>hash_builder</code> passed should implement the <a href="../../std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a> trait for |
| the HashMap to be useful, see its documentation for details.</p> |
| <h5 id="examples-9"><a href="#examples-9">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">use </span>hashbrown::hash_map::DefaultHashBuilder; |
| |
| <span class="kw">let </span>s = DefaultHashBuilder::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::with_hasher(s); |
| set.insert(<span class="number">2</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.with_capacity_and_hasher" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#446-450">source</a><h4 class="code-header">pub fn <a href="#method.with_capacity_and_hasher" class="fnname">with_capacity_and_hasher</a>(capacity: usize, hasher: S) -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashSet</code> with the specified capacity, using |
| <code>hasher</code> to hash the keys.</p> |
| <p>The hash set will be able to hold at least <code>capacity</code> elements without |
| reallocating. If <code>capacity</code> is 0, the hash set will not allocate.</p> |
| <p>Warning: <code>hasher</code> is normally randomly generated, and |
| is designed to allow <code>HashSet</code>s to be resistant to attacks that |
| cause many collisions and very poor performance. Setting it |
| manually using this function can expose a DoS attack vector.</p> |
| <p>The <code>hash_builder</code> passed should implement the <a href="../../std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a> trait for |
| the HashMap to be useful, see its documentation for details.</p> |
| <h5 id="examples-10"><a href="#examples-10">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">use </span>hashbrown::hash_map::DefaultHashBuilder; |
| |
| <span class="kw">let </span>s = DefaultHashBuilder::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::with_capacity_and_hasher(<span class="number">10</span>, s); |
| set.insert(<span class="number">1</span>);</code></pre></div> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-HashSet%3CT%2C%20S%2C%20A%3E-1" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#453-536">source</a><a href="#impl-HashSet%3CT%2C%20S%2C%20A%3E-1" class="anchor"></a><h3 class="code-header">impl<T, S, A> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.allocator" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#459-461">source</a><h4 class="code-header">pub fn <a href="#method.allocator" class="fnname">allocator</a>(&self) -> &A</h4></section></summary><div class="docblock"><p>Returns a reference to the underlying allocator.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.with_hasher_in" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#484-488">source</a><h4 class="code-header">pub fn <a href="#method.with_hasher_in" class="fnname">with_hasher_in</a>(hasher: S, alloc: A) -> Self</h4></section></summary><div class="docblock"><p>Creates a new empty hash set which will use the given hasher to hash |
| keys.</p> |
| <p>The hash set is also created with the default initial capacity.</p> |
| <p>Warning: <code>hasher</code> is normally randomly generated, and |
| is designed to allow <code>HashSet</code>s to be resistant to attacks that |
| cause many collisions and very poor performance. Setting it |
| manually using this function can expose a DoS attack vector.</p> |
| <h5 id="examples-11"><a href="#examples-11">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">use </span>hashbrown::hash_map::DefaultHashBuilder; |
| |
| <span class="kw">let </span>s = DefaultHashBuilder::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::with_hasher(s); |
| set.insert(<span class="number">2</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.with_capacity_and_hasher_in" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#512-516">source</a><h4 class="code-header">pub fn <a href="#method.with_capacity_and_hasher_in" class="fnname">with_capacity_and_hasher_in</a>(capacity: usize, hasher: S, alloc: A) -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashSet</code> with the specified capacity, using |
| <code>hasher</code> to hash the keys.</p> |
| <p>The hash set will be able to hold at least <code>capacity</code> elements without |
| reallocating. If <code>capacity</code> is 0, the hash set will not allocate.</p> |
| <p>Warning: <code>hasher</code> is normally randomly generated, and |
| is designed to allow <code>HashSet</code>s to be resistant to attacks that |
| cause many collisions and very poor performance. Setting it |
| manually using this function can expose a DoS attack vector.</p> |
| <h5 id="examples-12"><a href="#examples-12">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">use </span>hashbrown::hash_map::DefaultHashBuilder; |
| |
| <span class="kw">let </span>s = DefaultHashBuilder::default(); |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::with_capacity_and_hasher(<span class="number">10</span>, s); |
| set.insert(<span class="number">1</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.hasher" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#533-535">source</a><h4 class="code-header">pub fn <a href="#method.hasher" class="fnname">hasher</a>(&self) -> &S</h4></section></summary><div class="docblock"><p>Returns a reference to the set’s <a href="https://doc.rust-lang.org/std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a>.</p> |
| <h5 id="examples-13"><a href="#examples-13">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">use </span>hashbrown::hash_map::DefaultHashBuilder; |
| |
| <span class="kw">let </span>hasher = DefaultHashBuilder::default(); |
| <span class="kw">let </span>set: HashSet<i32> = HashSet::with_hasher(hasher); |
| <span class="kw">let </span>hasher: <span class="kw-2">&</span>DefaultHashBuilder = set.hasher();</code></pre></div> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-HashSet%3CT%2C%20S%2C%20A%3E-2" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#538-1145">source</a><a href="#impl-HashSet%3CT%2C%20S%2C%20A%3E-2" class="anchor"></a><h3 class="code-header">impl<T, S, A> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.reserve" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#561-563">source</a><h4 class="code-header">pub fn <a href="#method.reserve" class="fnname">reserve</a>(&mut self, additional: usize)</h4></section></summary><div class="docblock"><p>Reserves capacity for at least <code>additional</code> more elements to be inserted |
| in the <code>HashSet</code>. The collection may reserve more space to avoid |
| frequent reallocations.</p> |
| <h5 id="panics"><a href="#panics">Panics</a></h5> |
| <p>Panics if the new allocation size overflows <code>usize</code>.</p> |
| <h5 id="examples-14"><a href="#examples-14">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<i32> = HashSet::new(); |
| set.reserve(<span class="number">10</span>); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">10</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_reserve" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#582-584">source</a><h4 class="code-header">pub fn <a href="#method.try_reserve" class="fnname">try_reserve</a>(&mut self, additional: usize) -> Result<(), <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>HashSet<K,V></code>. The collection may reserve more space to avoid |
| frequent reallocations.</p> |
| <h5 id="errors"><a href="#errors">Errors</a></h5> |
| <p>If the capacity overflows, or the allocator reports a failure, then an error |
| is returned.</p> |
| <h5 id="examples-15"><a href="#examples-15">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<i32> = HashSet::new(); |
| set.try_reserve(<span class="number">10</span>).expect(<span class="string">"why is the test harness OOMing on 10 bytes?"</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.shrink_to_fit" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#603-605">source</a><h4 class="code-header">pub fn <a href="#method.shrink_to_fit" class="fnname">shrink_to_fit</a>(&mut self)</h4></section></summary><div class="docblock"><p>Shrinks the capacity of the set 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-16"><a href="#examples-16">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::with_capacity(<span class="number">100</span>); |
| set.insert(<span class="number">1</span>); |
| set.insert(<span class="number">2</span>); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">100</span>); |
| set.shrink_to_fit(); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">2</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.shrink_to" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#629-631">source</a><h4 class="code-header">pub fn <a href="#method.shrink_to" class="fnname">shrink_to</a>(&mut self, min_capacity: usize)</h4></section></summary><div class="docblock"><p>Shrinks the capacity of the set 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>Panics if the current capacity is smaller than the supplied |
| minimum capacity.</p> |
| <h5 id="examples-17"><a href="#examples-17">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::with_capacity(<span class="number">100</span>); |
| set.insert(<span class="number">1</span>); |
| set.insert(<span class="number">2</span>); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">100</span>); |
| set.shrink_to(<span class="number">10</span>); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">10</span>); |
| set.shrink_to(<span class="number">0</span>); |
| <span class="macro">assert!</span>(set.capacity() >= <span class="number">2</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.difference" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#657-662">source</a><h4 class="code-header">pub fn <a href="#method.difference" class="fnname">difference</a><'a>(&'a self, other: &'a Self) -> <a class="struct" href="struct.Difference.html" title="struct hashbrown::hash_set::Difference">Difference</a><'a, T, S, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Difference.html" title="struct hashbrown::hash_set::Difference">Difference</a><'a, T, S, A></span><code class="content"><span class="where fmt-newline">impl<'a, T, S, A> Iterator for <a class="struct" href="struct.Difference.html" title="struct hashbrown::hash_set::Difference">Difference</a><'a, T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = &'a T;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Visits the values representing the difference, |
| i.e., the values that are in <code>self</code> but not in <code>other</code>.</p> |
| <h5 id="examples-18"><a href="#examples-18">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = [<span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].iter().cloned().collect(); |
| |
| <span class="comment">// Can be seen as `a - b`. |
| </span><span class="kw">for </span>x <span class="kw">in </span>a.difference(<span class="kw-2">&</span>b) { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, x); <span class="comment">// Print 1 |
| </span>} |
| |
| <span class="kw">let </span>diff: HashSet<<span class="kw">_</span>> = a.difference(<span class="kw-2">&</span>b).collect(); |
| <span class="macro">assert_eq!</span>(diff, [<span class="number">1</span>].iter().collect()); |
| |
| <span class="comment">// Note that difference is not symmetric, |
| // and `b - a` means something else: |
| </span><span class="kw">let </span>diff: HashSet<<span class="kw">_</span>> = b.difference(<span class="kw-2">&</span>a).collect(); |
| <span class="macro">assert_eq!</span>(diff, [<span class="number">4</span>].iter().collect());</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.symmetric_difference" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#686-690">source</a><h4 class="code-header">pub fn <a href="#method.symmetric_difference" class="fnname">symmetric_difference</a><'a>(<br> &'a self,<br> other: &'a Self<br>) -> <a class="struct" href="struct.SymmetricDifference.html" title="struct hashbrown::hash_set::SymmetricDifference">SymmetricDifference</a><'a, T, S, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.SymmetricDifference.html" title="struct hashbrown::hash_set::SymmetricDifference">SymmetricDifference</a><'a, T, S, A></span><code class="content"><span class="where fmt-newline">impl<'a, T, S, A> Iterator for <a class="struct" href="struct.SymmetricDifference.html" title="struct hashbrown::hash_set::SymmetricDifference">SymmetricDifference</a><'a, T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = &'a T;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Visits the values representing the symmetric difference, |
| i.e., the values that are in <code>self</code> or in <code>other</code> but not in both.</p> |
| <h5 id="examples-19"><a href="#examples-19">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = [<span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].iter().cloned().collect(); |
| |
| <span class="comment">// Print 1, 4 in arbitrary order. |
| </span><span class="kw">for </span>x <span class="kw">in </span>a.symmetric_difference(<span class="kw-2">&</span>b) { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, x); |
| } |
| |
| <span class="kw">let </span>diff1: HashSet<<span class="kw">_</span>> = a.symmetric_difference(<span class="kw-2">&</span>b).collect(); |
| <span class="kw">let </span>diff2: HashSet<<span class="kw">_</span>> = b.symmetric_difference(<span class="kw-2">&</span>a).collect(); |
| |
| <span class="macro">assert_eq!</span>(diff1, diff2); |
| <span class="macro">assert_eq!</span>(diff1, [<span class="number">1</span>, <span class="number">4</span>].iter().collect());</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.intersection" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#711-721">source</a><h4 class="code-header">pub fn <a href="#method.intersection" class="fnname">intersection</a><'a>(&'a self, other: &'a Self) -> <a class="struct" href="struct.Intersection.html" title="struct hashbrown::hash_set::Intersection">Intersection</a><'a, T, S, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Intersection.html" title="struct hashbrown::hash_set::Intersection">Intersection</a><'a, T, S, A></span><code class="content"><span class="where fmt-newline">impl<'a, T, S, A> Iterator for <a class="struct" href="struct.Intersection.html" title="struct hashbrown::hash_set::Intersection">Intersection</a><'a, T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = &'a T;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Visits the values representing the intersection, |
| i.e., the values that are both in <code>self</code> and <code>other</code>.</p> |
| <h5 id="examples-20"><a href="#examples-20">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = [<span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].iter().cloned().collect(); |
| |
| <span class="comment">// Print 2, 3 in arbitrary order. |
| </span><span class="kw">for </span>x <span class="kw">in </span>a.intersection(<span class="kw-2">&</span>b) { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, x); |
| } |
| |
| <span class="kw">let </span>intersection: HashSet<<span class="kw">_</span>> = a.intersection(<span class="kw-2">&</span>b).collect(); |
| <span class="macro">assert_eq!</span>(intersection, [<span class="number">2</span>, <span class="number">3</span>].iter().collect());</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.union" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#742-753">source</a><h4 class="code-header">pub fn <a href="#method.union" class="fnname">union</a><'a>(&'a self, other: &'a Self) -> <a class="struct" href="struct.Union.html" title="struct hashbrown::hash_set::Union">Union</a><'a, T, S, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Union.html" title="struct hashbrown::hash_set::Union">Union</a><'a, T, S, A></span><code class="content"><span class="where fmt-newline">impl<'a, T, S, A> Iterator for <a class="struct" href="struct.Union.html" title="struct hashbrown::hash_set::Union">Union</a><'a, T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = &'a T;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Visits the values representing the union, |
| i.e., all the values in <code>self</code> or <code>other</code>, without duplicates.</p> |
| <h5 id="examples-21"><a href="#examples-21">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = [<span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].iter().cloned().collect(); |
| |
| <span class="comment">// Print 1, 2, 3, 4 in arbitrary order. |
| </span><span class="kw">for </span>x <span class="kw">in </span>a.union(<span class="kw-2">&</span>b) { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, x); |
| } |
| |
| <span class="kw">let union</span>: HashSet<<span class="kw">_</span>> = a.union(<span class="kw-2">&</span>b).collect(); |
| <span class="macro">assert_eq!</span>(union, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].iter().collect());</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.contains" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#774-780">source</a><h4 class="code-header">pub fn <a href="#method.contains" class="fnname">contains</a><Q: ?Sized>(&self, value: &Q) -> bool<span class="where fmt-newline">where<br> T: Borrow<Q>,<br> Q: Hash + Eq,</span></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the set contains a value.</p> |
| <p>The value may be any borrowed form of the set’s value 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 value type.</p> |
| <h5 id="examples-22"><a href="#examples-22">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>set: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="macro">assert_eq!</span>(set.contains(<span class="kw-2">&</span><span class="number">1</span>), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(set.contains(<span class="kw-2">&</span><span class="number">4</span>), <span class="bool-val">false</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#801-811">source</a><h4 class="code-header">pub fn <a href="#method.get" class="fnname">get</a><Q: ?Sized>(&self, value: &Q) -> Option<&T><span class="where fmt-newline">where<br> T: Borrow<Q>,<br> Q: Hash + Eq,</span></h4></section></summary><div class="docblock"><p>Returns a reference to the value in the set, if any, that is equal to the given value.</p> |
| <p>The value may be any borrowed form of the set’s value 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 value type.</p> |
| <h5 id="examples-23"><a href="#examples-23">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>set: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="macro">assert_eq!</span>(set.get(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(set.get(<span class="kw-2">&</span><span class="number">4</span>), <span class="prelude-val">None</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get_or_insert" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#828-836">source</a><h4 class="code-header">pub fn <a href="#method.get_or_insert" class="fnname">get_or_insert</a>(&mut self, value: T) -> &T</h4></section></summary><div class="docblock"><p>Inserts the given <code>value</code> into the set if it is not present, then |
| returns a reference to the value in the set.</p> |
| <h5 id="examples-24"><a href="#examples-24">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">3</span>); |
| <span class="macro">assert_eq!</span>(set.get_or_insert(<span class="number">2</span>), <span class="kw-2">&</span><span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(set.get_or_insert(<span class="number">100</span>), <span class="kw-2">&</span><span class="number">100</span>); |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">4</span>); <span class="comment">// 100 was inserted</span></code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get_or_insert_owned" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#857-869">source</a><h4 class="code-header">pub fn <a href="#method.get_or_insert_owned" class="fnname">get_or_insert_owned</a><Q: ?Sized>(&mut self, value: &Q) -> &T<span class="where fmt-newline">where<br> T: Borrow<Q>,<br> Q: Hash + Eq + ToOwned<Owned = T>,</span></h4></section></summary><div class="docblock"><p>Inserts an owned copy of the given <code>value</code> into the set if it is not |
| present, then returns a reference to the value in the set.</p> |
| <h5 id="examples-25"><a href="#examples-25">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<String> = [<span class="string">"cat"</span>, <span class="string">"dog"</span>, <span class="string">"horse"</span>] |
| .iter().map(|<span class="kw-2">&</span>pet| pet.to_owned()).collect(); |
| |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">3</span>); |
| <span class="kw">for </span><span class="kw-2">&</span>pet <span class="kw">in </span><span class="kw-2">&</span>[<span class="string">"cat"</span>, <span class="string">"dog"</span>, <span class="string">"fish"</span>] { |
| <span class="kw">let </span>value = set.get_or_insert_owned(pet); |
| <span class="macro">assert_eq!</span>(value, pet); |
| } |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">4</span>); <span class="comment">// a new "fish" was inserted</span></code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.get_or_insert_with" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#890-903">source</a><h4 class="code-header">pub fn <a href="#method.get_or_insert_with" class="fnname">get_or_insert_with</a><Q: ?Sized, F>(&mut self, value: &Q, f: F) -> &T<span class="where fmt-newline">where<br> T: Borrow<Q>,<br> Q: Hash + Eq,<br> F: FnOnce(&Q) -> T,</span></h4></section></summary><div class="docblock"><p>Inserts a value computed from <code>f</code> into the set if the given <code>value</code> is |
| not present, then returns a reference to the value in the set.</p> |
| <h5 id="examples-26"><a href="#examples-26">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<String> = [<span class="string">"cat"</span>, <span class="string">"dog"</span>, <span class="string">"horse"</span>] |
| .iter().map(|<span class="kw-2">&</span>pet| pet.to_owned()).collect(); |
| |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">3</span>); |
| <span class="kw">for </span><span class="kw-2">&</span>pet <span class="kw">in </span><span class="kw-2">&</span>[<span class="string">"cat"</span>, <span class="string">"dog"</span>, <span class="string">"fish"</span>] { |
| <span class="kw">let </span>value = set.get_or_insert_with(pet, str::to_owned); |
| <span class="macro">assert_eq!</span>(value, pet); |
| } |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">4</span>); <span class="comment">// a new "fish" was inserted</span></code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.entry" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#939-944">source</a><h4 class="code-header">pub fn <a href="#method.entry" class="fnname">entry</a>(&mut self, value: T) -> <a class="enum" href="enum.Entry.html" title="enum hashbrown::hash_set::Entry">Entry</a><'_, T, S, A></h4></section></summary><div class="docblock"><p>Gets the given value’s corresponding entry in the set for in-place manipulation.</p> |
| <h5 id="examples-27"><a href="#examples-27">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">use </span>hashbrown::hash_set::Entry::<span class="kw-2">*</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>singles = HashSet::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>dupes = HashSet::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">if let </span>Vacant(dupe_entry) = dupes.entry(ch) { |
| <span class="comment">// We haven't already seen a duplicate, so |
| // check if we've at least seen it once. |
| </span><span class="kw">match </span>singles.entry(ch) { |
| Vacant(single_entry) => { |
| <span class="comment">// We found a new character for the first time. |
| </span>single_entry.insert() |
| } |
| Occupied(single_entry) => { |
| <span class="comment">// We've already seen this once, "move" it to dupes. |
| </span>single_entry.remove(); |
| dupe_entry.insert(); |
| } |
| } |
| } |
| } |
| |
| <span class="macro">assert!</span>(!singles.contains(<span class="kw-2">&</span><span class="string">'t'</span>) && dupes.contains(<span class="kw-2">&</span><span class="string">'t'</span>)); |
| <span class="macro">assert!</span>(singles.contains(<span class="kw-2">&</span><span class="string">'u'</span>) && !dupes.contains(<span class="kw-2">&</span><span class="string">'u'</span>)); |
| <span class="macro">assert!</span>(!singles.contains(<span class="kw-2">&</span><span class="string">'v'</span>) && !dupes.contains(<span class="kw-2">&</span><span class="string">'v'</span>));</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_disjoint" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#963-965">source</a><h4 class="code-header">pub fn <a href="#method.is_disjoint" class="fnname">is_disjoint</a>(&self, other: &Self) -> bool</h4></section></summary><div class="docblock"><p>Returns <code>true</code> if <code>self</code> has no elements in common with <code>other</code>. |
| This is equivalent to checking for an empty intersection.</p> |
| <h5 id="examples-28"><a href="#examples-28">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>b = HashSet::new(); |
| |
| <span class="macro">assert_eq!</span>(a.is_disjoint(<span class="kw-2">&</span>b), <span class="bool-val">true</span>); |
| b.insert(<span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(a.is_disjoint(<span class="kw-2">&</span>b), <span class="bool-val">true</span>); |
| b.insert(<span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(a.is_disjoint(<span class="kw-2">&</span>b), <span class="bool-val">false</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_subset" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#984-986">source</a><h4 class="code-header">pub fn <a href="#method.is_subset" class="fnname">is_subset</a>(&self, other: &Self) -> bool</h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the set is a subset of another, |
| i.e., <code>other</code> contains at least all the values in <code>self</code>.</p> |
| <h5 id="examples-29"><a href="#examples-29">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>sup: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| |
| <span class="macro">assert_eq!</span>(set.is_subset(<span class="kw-2">&</span>sup), <span class="bool-val">true</span>); |
| set.insert(<span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(set.is_subset(<span class="kw-2">&</span>sup), <span class="bool-val">true</span>); |
| set.insert(<span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(set.is_subset(<span class="kw-2">&</span>sup), <span class="bool-val">false</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.is_superset" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1009-1011">source</a><h4 class="code-header">pub fn <a href="#method.is_superset" class="fnname">is_superset</a>(&self, other: &Self) -> bool</h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the set is a superset of another, |
| i.e., <code>self</code> contains at least all the values in <code>other</code>.</p> |
| <h5 id="examples-30"><a href="#examples-30">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>sub: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>].iter().cloned().collect(); |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| |
| <span class="macro">assert_eq!</span>(set.is_superset(<span class="kw-2">&</span>sub), <span class="bool-val">false</span>); |
| |
| set.insert(<span class="number">0</span>); |
| set.insert(<span class="number">1</span>); |
| <span class="macro">assert_eq!</span>(set.is_superset(<span class="kw-2">&</span>sub), <span class="bool-val">false</span>); |
| |
| set.insert(<span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(set.is_superset(<span class="kw-2">&</span>sub), <span class="bool-val">true</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.insert" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1031-1033">source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fnname">insert</a>(&mut self, value: T) -> bool</h4></section></summary><div class="docblock"><p>Adds a value to the set.</p> |
| <p>If the set did not have this value present, <code>true</code> is returned.</p> |
| <p>If the set did have this value present, <code>false</code> is returned.</p> |
| <h5 id="examples-31"><a href="#examples-31">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| |
| <span class="macro">assert_eq!</span>(set.insert(<span class="number">2</span>), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(set.insert(<span class="number">2</span>), <span class="bool-val">false</span>); |
| <span class="macro">assert_eq!</span>(set.len(), <span class="number">1</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.insert_unique_unchecked" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1055-1057">source</a><h4 class="code-header">pub fn <a href="#method.insert_unique_unchecked" class="fnname">insert_unique_unchecked</a>(&mut self, value: T) -> &T</h4></section></summary><div class="docblock"><p>Insert a value the set without checking if the value already exists in the set.</p> |
| <p>Returns a reference to the value just inserted.</p> |
| <p>This operation is safe if a value does not exist in the set.</p> |
| <p>However, if a value exists in the set already, the behavior is unspecified: |
| this operation may panic, loop forever, or any following operation with the set |
| 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>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 set. |
| For example, when constructing a set from another set, we know |
| that values are unique.</p> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.replace" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1075-1083">source</a><h4 class="code-header">pub fn <a href="#method.replace" class="fnname">replace</a>(&mut self, value: T) -> Option<T></h4></section></summary><div class="docblock"><p>Adds a value to the set, replacing the existing value, if any, that is equal to the given |
| one. Returns the replaced value.</p> |
| <h5 id="examples-32"><a href="#examples-32">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| set.insert(Vec::<i32>::new()); |
| |
| <span class="macro">assert_eq!</span>(set.get(<span class="kw-2">&</span>[][..]).unwrap().capacity(), <span class="number">0</span>); |
| set.replace(Vec::with_capacity(<span class="number">10</span>)); |
| <span class="macro">assert_eq!</span>(set.get(<span class="kw-2">&</span>[][..]).unwrap().capacity(), <span class="number">10</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.remove" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1107-1113">source</a><h4 class="code-header">pub fn <a href="#method.remove" class="fnname">remove</a><Q: ?Sized>(&mut self, value: &Q) -> bool<span class="where fmt-newline">where<br> T: Borrow<Q>,<br> Q: Hash + Eq,</span></h4></section></summary><div class="docblock"><p>Removes a value from the set. Returns whether the value was |
| present in the set.</p> |
| <p>The value may be any borrowed form of the set’s value 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 value type.</p> |
| <h5 id="examples-33"><a href="#examples-33">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| |
| set.insert(<span class="number">2</span>); |
| <span class="macro">assert_eq!</span>(set.remove(<span class="kw-2">&</span><span class="number">2</span>), <span class="bool-val">true</span>); |
| <span class="macro">assert_eq!</span>(set.remove(<span class="kw-2">&</span><span class="number">2</span>), <span class="bool-val">false</span>);</code></pre></div> |
| </div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.take" class="method has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1134-1144">source</a><h4 class="code-header">pub fn <a href="#method.take" class="fnname">take</a><Q: ?Sized>(&mut self, value: &Q) -> Option<T><span class="where fmt-newline">where<br> T: Borrow<Q>,<br> Q: Hash + Eq,</span></h4></section></summary><div class="docblock"><p>Removes and returns the value in the set, if any, that is equal to the given one.</p> |
| <p>The value may be any borrowed form of the set’s value 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 value type.</p> |
| <h5 id="examples-34"><a href="#examples-34">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>set: HashSet<<span class="kw">_</span>> = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].iter().cloned().collect(); |
| <span class="macro">assert_eq!</span>(set.take(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| <span class="macro">assert_eq!</span>(set.take(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">None</span>);</code></pre></div> |
| </div></details></div></details></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor"></a></h2><div id="trait-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-BitAnd%3C%26HashSet%3CT%2C%20S%2C%20A%3E%3E-for-%26HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1319-1350">source</a><a href="#impl-BitAnd%3C%26HashSet%3CT%2C%20S%2C%20A%3E%3E-for-%26HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> BitAnd<&<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A>> for &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash + Clone,<br> S: BuildHasher + Default,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.bitand" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1347-1349">source</a><a href="#method.bitand" class="anchor"></a><h4 class="code-header">fn <a class="fnname">bitand</a>(self, rhs: &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A>) -> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S></h4></section></summary><div class="docblock"><p>Returns the intersection of <code>self</code> and <code>rhs</code> as a new <code>HashSet<T, S></code>.</p> |
| <h5 id="examples-36"><a href="#examples-36">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].into_iter().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].into_iter().collect(); |
| |
| <span class="kw">let </span>set = <span class="kw-2">&</span>a & <span class="kw-2">&</span>b; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">let </span>expected = [<span class="number">2</span>, <span class="number">3</span>]; |
| <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&</span>set { |
| <span class="macro">assert!</span>(expected.contains(x)); |
| i += <span class="number">1</span>; |
| } |
| <span class="macro">assert_eq!</span>(i, expected.len());</code></pre></div> |
| </div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.Output-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Output-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Output</a> = <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global></h4></section></summary><div class='docblock'>The resulting type after applying the <code>&</code> operator.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-BitOr%3C%26HashSet%3CT%2C%20S%2C%20A%3E%3E-for-%26HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1286-1317">source</a><a href="#impl-BitOr%3C%26HashSet%3CT%2C%20S%2C%20A%3E%3E-for-%26HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> BitOr<&<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A>> for &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash + Clone,<br> S: BuildHasher + Default,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.bitor" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1314-1316">source</a><a href="#method.bitor" class="anchor"></a><h4 class="code-header">fn <a class="fnname">bitor</a>(self, rhs: &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A>) -> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S></h4></section></summary><div class="docblock"><p>Returns the union of <code>self</code> and <code>rhs</code> as a new <code>HashSet<T, S></code>.</p> |
| <h5 id="examples-35"><a href="#examples-35">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].into_iter().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>].into_iter().collect(); |
| |
| <span class="kw">let </span>set = <span class="kw-2">&</span>a | <span class="kw-2">&</span>b; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">let </span>expected = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]; |
| <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&</span>set { |
| <span class="macro">assert!</span>(expected.contains(x)); |
| i += <span class="number">1</span>; |
| } |
| <span class="macro">assert_eq!</span>(i, expected.len());</code></pre></div> |
| </div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.Output" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Output" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Output</a> = <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global></h4></section></summary><div class='docblock'>The resulting type after applying the <code>|</code> operator.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-BitXor%3C%26HashSet%3CT%2C%20S%2C%20Global%3E%3E-for-%26HashSet%3CT%2C%20S%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1352-1382">source</a><a href="#impl-BitXor%3C%26HashSet%3CT%2C%20S%2C%20Global%3E%3E-for-%26HashSet%3CT%2C%20S%3E" class="anchor"></a><h3 class="code-header">impl<T, S> BitXor<&<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global>> for &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S><span class="where fmt-newline">where<br> T: Eq + Hash + Clone,<br> S: BuildHasher + Default,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.bitxor" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1379-1381">source</a><a href="#method.bitxor" class="anchor"></a><h4 class="code-header">fn <a class="fnname">bitxor</a>(self, rhs: &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S>) -> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S></h4></section></summary><div class="docblock"><p>Returns the symmetric difference of <code>self</code> and <code>rhs</code> as a new <code>HashSet<T, S></code>.</p> |
| <h5 id="examples-37"><a href="#examples-37">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].into_iter().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>].into_iter().collect(); |
| |
| <span class="kw">let </span>set = <span class="kw-2">&</span>a ^ <span class="kw-2">&</span>b; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">let </span>expected = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>, <span class="number">5</span>]; |
| <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&</span>set { |
| <span class="macro">assert!</span>(expected.contains(x)); |
| i += <span class="number">1</span>; |
| } |
| <span class="macro">assert_eq!</span>(i, expected.len());</code></pre></div> |
| </div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.Output-2" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Output-2" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Output</a> = <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global></h4></section></summary><div class='docblock'>The resulting type after applying the <code>^</code> operator.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Clone-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#119-129">source</a><a href="#impl-Clone-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T: Clone, S: Clone, A: Allocator + Clone> Clone for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#120-124">source</a><a href="#method.clone" class="anchor"></a><h4 class="code-header">fn <a class="fnname">clone</a>(&self) -> Self</h4></section></summary><div class='docblock'>Returns a copy of the value. <a>Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#126-128">source</a><a href="#method.clone_from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">clone_from</a>(&mut self, source: &Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Debug-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1170-1178">source</a><a href="#impl-Debug-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Debug for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Debug,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1175-1177">source</a><a href="#method.fmt" class="anchor"></a><h4 class="code-header">fn <a class="fnname">fmt</a>(&self, f: &mut Formatter<'_>) -> Result</h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Default-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1272-1284">source</a><a href="#impl-Default-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Default for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> S: Default,<br> A: Default + Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.default" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1279-1283">source</a><a href="#method.default" class="anchor"></a><h4 class="code-header">fn <a class="fnname">default</a>() -> Self</h4></section></summary><div class="docblock"><p>Creates an empty <code>HashSet<T, S></code> with the <code>Default</code> value for the hasher.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Extend%3C%26%27a%20T%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1248-1270">source</a><a href="#impl-Extend%3C%26%27a%20T%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<'a, T, S, A> Extend<&'a T> for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: 'a + Eq + Hash + Copy,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.extend-1" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1255-1257">source</a><a href="#method.extend-1" class="anchor"></a><h4 class="code-header">fn <a class="fnname">extend</a><I: IntoIterator<Item = &'a T>>(&mut self, iter: I)</h4></section></summary><div class='docblock'>Extends a collection with the contents of an iterator. <a>Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.extend_one-1" class="method trait-impl has-srclink"><a href="#method.extend_one-1" class="anchor"></a><h4 class="code-header">fn <a class="fnname">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="rustdoc-toggle method-toggle" open><summary><section id="method.extend_reserve-1" class="method trait-impl has-srclink"><a href="#method.extend_reserve-1" class="anchor"></a><h4 class="code-header">fn <a class="fnname">extend_reserve</a>(&mut self, additional: usize)</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>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Extend%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1224-1246">source</a><a href="#impl-Extend%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Extend<T> for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.extend" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1231-1233">source</a><a href="#method.extend" class="anchor"></a><h4 class="code-header">fn <a class="fnname">extend</a><I: IntoIterator<Item = T>>(&mut self, iter: I)</h4></section></summary><div class='docblock'>Extends a collection with the contents of an iterator. <a>Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.extend_one" class="method trait-impl has-srclink"><a href="#method.extend_one" class="anchor"></a><h4 class="code-header">fn <a class="fnname">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="rustdoc-toggle method-toggle" open><summary><section id="method.extend_reserve" class="method trait-impl has-srclink"><a href="#method.extend_reserve" class="anchor"></a><h4 class="code-header">fn <a class="fnname">extend_reserve</a>(&mut self, additional: usize)</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>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-From%3CHashMap%3CT%2C%20()%2C%20S%2C%20A%3E%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1180-1187">source</a><a href="#impl-From%3CHashMap%3CT%2C%20()%2C%20S%2C%20A%3E%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> From<<a class="struct" href="../hash_map/struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><T, (), S, A>> for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1184-1186">source</a><a href="#method.from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">from</a>(map: <a class="struct" href="../hash_map/struct.HashMap.html" title="struct hashbrown::hash_map::HashMap">HashMap</a><T, (), S, A>) -> Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-FromIterator%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1189-1201">source</a><a href="#impl-FromIterator%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> FromIterator<T> for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher + Default,<br> A: Default + Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from_iter" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1196-1200">source</a><a href="#method.from_iter" class="anchor"></a><h4 class="code-header">fn <a class="fnname">from_iter</a><I: IntoIterator<Item = T>>(iter: I) -> Self</h4></section></summary><div class='docblock'>Creates a value from an iterator. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26%27a%20HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1514-1522">source</a><a href="#impl-IntoIterator-for-%26%27a%20HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<'a, T, S, A: Allocator + Clone> IntoIterator for &'a <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Item" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Item" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Item</a> = &'a T</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.IntoIter" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.IntoIter" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">IntoIter</a> = <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'a, T></h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_iter" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1519-1521">source</a><a href="#method.into_iter" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into_iter</a>(self) -> <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'a, T><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'a, K></span><code class="content"><span class="where fmt-newline">impl<'a, K> Iterator for <a class="struct" href="struct.Iter.html" title="struct hashbrown::hash_set::Iter">Iter</a><'a, K></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = &'a K;</span></code></span></span></span></span></h4></section></summary><div class='docblock'>Creates an iterator from a value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1524-1554">source</a><a href="#impl-IntoIterator-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A: Allocator + Clone> IntoIterator for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into_iter-1" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1549-1553">source</a><a href="#method.into_iter-1" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into_iter</a>(self) -> <a class="struct" href="struct.IntoIter.html" title="struct hashbrown::hash_set::IntoIter">IntoIter</a><T, A><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.IntoIter.html" title="struct hashbrown::hash_set::IntoIter">IntoIter</a><K, A></span><code class="content"><span class="where fmt-newline">impl<K, A: Allocator + Clone> Iterator for <a class="struct" href="struct.IntoIter.html" title="struct hashbrown::hash_set::IntoIter">IntoIter</a><K, A></span><span class="where fmt-newline"> type <a class="associatedtype">Item</a> = K;</span></code></span></span></span></span></h4></section></summary><div class="docblock"><p>Creates a consuming iterator, that is, one that moves each value out |
| of the set in arbitrary order. The set cannot be used after calling |
| this.</p> |
| <h5 id="examples-39"><a href="#examples-39">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| <span class="kw">let </span><span class="kw-2">mut </span>set = HashSet::new(); |
| set.insert(<span class="string">"a"</span>.to_string()); |
| set.insert(<span class="string">"b"</span>.to_string()); |
| |
| <span class="comment">// Not possible to collect to a Vec<String> with a regular `.iter()`. |
| </span><span class="kw">let </span>v: Vec<String> = set.into_iter().collect(); |
| |
| <span class="comment">// Will print in an arbitrary order. |
| </span><span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&</span>v { |
| <span class="macro">println!</span>(<span class="string">"{}"</span>, x); |
| }</code></pre></div> |
| </div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.Item-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Item-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Item</a> = T</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.IntoIter-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.IntoIter-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">IntoIter</a> = <a class="struct" href="struct.IntoIter.html" title="struct hashbrown::hash_set::IntoIter">IntoIter</a><T, A></h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-PartialEq%3CHashSet%3CT%2C%20S%2C%20A%3E%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1147-1160">source</a><a href="#impl-PartialEq%3CHashSet%3CT%2C%20S%2C%20A%3E%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> PartialEq<<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A>> for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1153-1159">source</a><a href="#method.eq" class="anchor"></a><h4 class="code-header">fn <a class="fnname">eq</a>(&self, other: &Self) -> bool</h4></section></summary><div class='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used |
| by <code>==</code>. <a>Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl has-srclink"><span class="since rightside" title="Stable since Rust version 1.0.0">1.0.0</span><a href="#method.ne" class="anchor"></a><h4 class="code-header">const fn <a class="fnname">ne</a>(&self, other: &Rhs) -> bool</h4></section></summary><div class='docblock'>This method tests for <code>!=</code>. The default implementation is almost always |
| sufficient, and should not be overridden without very good reason. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><section id="impl-Sub%3C%26HashSet%3CT%2C%20S%2C%20Global%3E%3E-for-%26HashSet%3CT%2C%20S%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1384-1414">source</a><a href="#impl-Sub%3C%26HashSet%3CT%2C%20S%2C%20Global%3E%3E-for-%26HashSet%3CT%2C%20S%3E" class="anchor"></a><h3 class="code-header">impl<T, S> Sub<&<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global>> for &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S><span class="where fmt-newline">where<br> T: Eq + Hash + Clone,<br> S: BuildHasher + Default,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.sub" class="method trait-impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1411-1413">source</a><a href="#method.sub" class="anchor"></a><h4 class="code-header">fn <a class="fnname">sub</a>(self, rhs: &<a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S>) -> <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S></h4></section></summary><div class="docblock"><p>Returns the difference of <code>self</code> and <code>rhs</code> as a new <code>HashSet<T, S></code>.</p> |
| <h5 id="examples-38"><a href="#examples-38">Examples</a></h5> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hashbrown::HashSet; |
| |
| <span class="kw">let </span>a: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].into_iter().collect(); |
| <span class="kw">let </span>b: HashSet<<span class="kw">_</span>> = <span class="macro">vec!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>].into_iter().collect(); |
| |
| <span class="kw">let </span>set = <span class="kw-2">&</span>a - <span class="kw-2">&</span>b; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>; |
| <span class="kw">let </span>expected = [<span class="number">1</span>, <span class="number">2</span>]; |
| <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&</span>set { |
| <span class="macro">assert!</span>(expected.contains(x)); |
| i += <span class="number">1</span>; |
| } |
| <span class="macro">assert_eq!</span>(i, expected.len());</code></pre></div> |
| </div></details><details class="rustdoc-toggle" open><summary><section id="associatedtype.Output-3" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Output-3" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Output</a> = <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, Global></h4></section></summary><div class='docblock'>The resulting type after applying the <code>-</code> operator.</div></details></div></details><section id="impl-Eq-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a class="srclink rightside" href="../../src/hashbrown/set.rs.html#1162-1168">source</a><a href="#impl-Eq-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Eq for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> T: Eq + Hash,<br> S: BuildHasher,<br> A: Allocator + Clone,</span></h3></section></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-RefUnwindSafe-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> RefUnwindSafe for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: RefUnwindSafe,<br> S: RefUnwindSafe,<br> T: RefUnwindSafe,</span></h3></section><section id="impl-Send-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-Send-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Send for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: Send,<br> S: Send,<br> T: Send,</span></h3></section><section id="impl-Sync-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-Sync-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Sync for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: Sync,<br> S: Sync,<br> T: Sync,</span></h3></section><section id="impl-Unpin-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-Unpin-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> Unpin for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: Unpin,<br> S: Unpin,<br> T: Unpin,</span></h3></section><section id="impl-UnwindSafe-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-UnwindSafe-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, S, A> UnwindSafe for <a class="struct" href="struct.HashSet.html" title="struct hashbrown::hash_set::HashSet">HashSet</a><T, S, A><span class="where fmt-newline">where<br> A: UnwindSafe,<br> S: UnwindSafe,<br> T: UnwindSafe,</span></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Any-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-Any-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T> Any for T<span class="where fmt-newline">where<br> T: 'static + ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl has-srclink"><a href="#method.type_id" class="anchor"></a><h4 class="code-header">fn <a class="fnname">type_id</a>(&self) -> TypeId</h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-Borrow%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T> Borrow<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow</a>(&self) -> &T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-BorrowMut%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T> BorrowMut<T> for T<span class="where fmt-newline">where<br> T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/91522" title="Tracking issue for const_borrow">unstable</a></span><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">fn <a class="fnname">borrow_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-From%3CT%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T> From<T> for T</h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.from-1" class="anchor"></a><h4 class="code-header">fn <a class="fnname">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-Into%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, U> Into<U> for T<span class="where fmt-newline">where<br> U: From<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><section id="method.into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p> |
| <p>That is, this conversion is whatever the implementation of |
| <code>[From]<T> for U</code> chooses to do.</p> |
| </div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-ToOwned-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-ToOwned-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T> ToOwned for T<span class="where fmt-newline">where<br> T: Clone,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Owned" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl has-srclink"><a href="#method.to_owned" class="anchor"></a><h4 class="code-header">fn <a class="fnname">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a>Read more</a></div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl has-srclink"><a href="#method.clone_into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">clone_into</a>(&self, target: &mut T)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a>Read more</a></div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-TryFrom%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryFrom<U> for T<span class="where fmt-newline">where<br> U: Into<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error-1" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = Infallible</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_from" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_from</a>(value: U) -> Result<T, <T as TryFrom<U>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="rustdoc-toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="impl has-srclink"><a href="#impl-TryInto%3CU%3E-for-HashSet%3CT%2C%20S%2C%20A%3E" class="anchor"></a><h3 class="code-header">impl<T, U> TryInto<U> for T<span class="where fmt-newline">where<br> U: TryFrom<T>,</span></h3></section></summary><div class="impl-items"><details class="rustdoc-toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl has-srclink"><a href="#associatedtype.Error" class="anchor"></a><h4 class="code-header">type <a class="associatedtype">Error</a> = <U as TryFrom<T>>::Error</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="rustdoc-toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl has-srclink"><span class="since rightside" title="const unstable">const: <a href="https://github.com/rust-lang/rust/issues/88674" title="Tracking issue for const_convert">unstable</a></span><a href="#method.try_into" class="anchor"></a><h4 class="code-header">fn <a class="fnname">try_into</a>(self) -> Result<U, <U as TryFrom<T>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="hashbrown" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
