<!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="Source to the Rust file `libstd/collections/hash/set.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>set.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../light.css" id="themeStyle"><script src="../../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../../settings.html"><img src="../../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="kw">use</span> <span class="ident">borrow</span>::<span class="ident">Borrow</span>;
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">hash</span>::{<span class="ident">Hash</span>, <span class="ident">BuildHasher</span>};
<span class="kw">use</span> <span class="ident">iter</span>::{<span class="ident">Chain</span>, <span class="ident">FromIterator</span>, <span class="ident">FusedIterator</span>};
<span class="kw">use</span> <span class="ident">ops</span>::{<span class="ident">BitOr</span>, <span class="ident">BitAnd</span>, <span class="ident">BitXor</span>, <span class="ident">Sub</span>};
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Recover</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">map</span>::{<span class="self">self</span>, <span class="ident">HashMap</span>, <span class="ident">Keys</span>, <span class="ident">RandomState</span>};
<span class="comment">// Future Optimization (FIXME!)</span>
<span class="comment">// =============================</span>
<span class="comment">//</span>
<span class="comment">// Iteration over zero sized values is a noop. There is no need</span>
<span class="comment">// for `bucket.val` in the case of HashSet. I suppose we would need HKT</span>
<span class="comment">// to get rid of it properly.</span>
<span class="doccomment">/// A hash set implemented as a `HashMap` where the value is `()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// As with the [`HashMap`] type, a `HashSet` requires that the elements</span>
<span class="doccomment">/// implement the [`Eq`] and [`Hash`] traits. This can frequently be achieved by</span>
<span class="doccomment">/// using `#[derive(PartialEq, Eq, Hash)]`. If you implement these yourself,</span>
<span class="doccomment">/// it is important that the following property holds:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```text</span>
<span class="doccomment">/// k1 == k2 -> hash(k1) == hash(k2)</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In other words, if two keys are equal, their hashes must be equal.</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is a logic error for an item to be modified in such a way that the</span>
<span class="doccomment">/// item's hash, as determined by the [`Hash`] trait, or its equality, as</span>
<span class="doccomment">/// determined by the [`Eq`] trait, changes while it is in the set. This is</span>
<span class="doccomment">/// normally only possible through [`Cell`], [`RefCell`], global state, I/O, or</span>
<span class="doccomment">/// unsafe code.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// // Type inference lets us omit an explicit type signature (which</span>
<span class="doccomment">/// // would be `HashSet<String>` in this example).</span>
<span class="doccomment">/// let mut books = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Add some books.</span>
<span class="doccomment">/// books.insert("A Dance With Dragons".to_string());</span>
<span class="doccomment">/// books.insert("To Kill a Mockingbird".to_string());</span>
<span class="doccomment">/// books.insert("The Odyssey".to_string());</span>
<span class="doccomment">/// books.insert("The Great Gatsby".to_string());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Check for a specific one.</span>
<span class="doccomment">/// if !books.contains("The Winds of Winter") {</span>
<span class="doccomment">/// println!("We have {} books, but The Winds of Winter ain't one.",</span>
<span class="doccomment">/// books.len());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Remove a book.</span>
<span class="doccomment">/// books.remove("The Odyssey");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Iterate over everything.</span>
<span class="doccomment">/// for book in &books {</span>
<span class="doccomment">/// println!("{}", book);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The easiest way to use `HashSet` with a custom type is to derive</span>
<span class="doccomment">/// [`Eq`] and [`Hash`]. We must also derive [`PartialEq`], this will in the</span>
<span class="doccomment">/// future be implied by [`Eq`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// #[derive(Hash, Eq, PartialEq, Debug)]</span>
<span class="doccomment">/// struct Viking {</span>
<span class="doccomment">/// name: String,</span>
<span class="doccomment">/// power: usize,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut vikings = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// vikings.insert(Viking { name: "Einar".to_string(), power: 9 });</span>
<span class="doccomment">/// vikings.insert(Viking { name: "Einar".to_string(), power: 9 });</span>
<span class="doccomment">/// vikings.insert(Viking { name: "Olaf".to_string(), power: 4 });</span>
<span class="doccomment">/// vikings.insert(Viking { name: "Harald".to_string(), power: 8 });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Use derived implementation to print the vikings.</span>
<span class="doccomment">/// for x in &vikings {</span>
<span class="doccomment">/// println!("{:?}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A `HashSet` with fixed list of elements can be initialized from an array:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// let viking_names: HashSet<&'static str> =</span>
<span class="doccomment">/// [ "Einar", "Olaf", "Harald" ].iter().cloned().collect();</span>
<span class="doccomment">/// // use the values stored in the set</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Cell`]: ../../std/cell/struct.Cell.html</span>
<span class="doccomment">/// [`Eq`]: ../../std/cmp/trait.Eq.html</span>
<span class="doccomment">/// [`Hash`]: ../../std/hash/trait.Hash.html</span>
<span class="doccomment">/// [`HashMap`]: struct.HashMap.html</span>
<span class="doccomment">/// [`PartialEq`]: ../../std/cmp/trait.PartialEq.html</span>
<span class="doccomment">/// [`RefCell`]: ../../std/cell/struct.RefCell.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span> <span class="op">=</span> <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">map</span>: <span class="ident">HashMap</span><span class="op"><</span><span class="ident">T</span>, (), <span class="ident">S</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Eq</span><span class="op">></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="doccomment">/// Creates an empty `HashSet`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The hash set is initially created with a capacity of 0, so it will not allocate until it</span>
<span class="doccomment">/// is first inserted into.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let set: HashSet<i32> = HashSet::new();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">HashSet</span> { <span class="ident">map</span>: <span class="ident">HashMap</span>::<span class="ident">new</span>() }
}
<span class="doccomment">/// Creates an empty `HashSet` with the specified capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The hash set will be able to hold at least `capacity` elements without</span>
<span class="doccomment">/// reallocating. If `capacity` is 0, the hash set will not allocate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let set: HashSet<i32> = HashSet::with_capacity(10);</span>
<span class="doccomment">/// assert!(set.capacity() >= 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_capacity</span>(<span class="ident">capacity</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">HashSet</span> { <span class="ident">map</span>: <span class="ident">HashMap</span>::<span class="ident">with_capacity</span>(<span class="ident">capacity</span>) }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="doccomment">/// Creates a new empty hash set which will use the given hasher to hash</span>
<span class="doccomment">/// keys.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The hash set is also created with the default initial capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Warning: `hasher` is normally randomly generated, and</span>
<span class="doccomment">/// is designed to allow `HashSet`s to be resistant to attacks that</span>
<span class="doccomment">/// cause many collisions and very poor performance. Setting it</span>
<span class="doccomment">/// manually using this function can expose a DoS attack vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// use std::collections::hash_map::RandomState;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let s = RandomState::new();</span>
<span class="doccomment">/// let mut set = HashSet::with_hasher(s);</span>
<span class="doccomment">/// set.insert(2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hashmap_build_hasher"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_hasher</span>(<span class="ident">hasher</span>: <span class="ident">S</span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">HashSet</span> { <span class="ident">map</span>: <span class="ident">HashMap</span>::<span class="ident">with_hasher</span>(<span class="ident">hasher</span>) }
}
<span class="doccomment">/// Creates an empty `HashSet` with with the specified capacity, using</span>
<span class="doccomment">/// `hasher` to hash the keys.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The hash set will be able to hold at least `capacity` elements without</span>
<span class="doccomment">/// reallocating. If `capacity` is 0, the hash set will not allocate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Warning: `hasher` is normally randomly generated, and</span>
<span class="doccomment">/// is designed to allow `HashSet`s to be resistant to attacks that</span>
<span class="doccomment">/// cause many collisions and very poor performance. Setting it</span>
<span class="doccomment">/// manually using this function can expose a DoS attack vector.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// use std::collections::hash_map::RandomState;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let s = RandomState::new();</span>
<span class="doccomment">/// let mut set = HashSet::with_capacity_and_hasher(10, s);</span>
<span class="doccomment">/// set.insert(1);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hashmap_build_hasher"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.7.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_capacity_and_hasher</span>(<span class="ident">capacity</span>: <span class="ident">usize</span>, <span class="ident">hasher</span>: <span class="ident">S</span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">HashSet</span> { <span class="ident">map</span>: <span class="ident">HashMap</span>::<span class="ident">with_capacity_and_hasher</span>(<span class="ident">capacity</span>, <span class="ident">hasher</span>) }
}
<span class="doccomment">/// Returns a reference to the set's [`BuildHasher`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`BuildHasher`]: ../../std/hash/trait.BuildHasher.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// use std::collections::hash_map::RandomState;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let hasher = RandomState::new();</span>
<span class="doccomment">/// let set: HashSet<i32> = HashSet::with_hasher(hasher);</span>
<span class="doccomment">/// let hasher: &RandomState = set.hasher();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hashmap_public_hasher"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">hasher</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">S</span> {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">hasher</span>()
}
<span class="doccomment">/// Returns the number of elements the set can hold without reallocating.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let set: HashSet<i32> = HashSet::with_capacity(100);</span>
<span class="doccomment">/// assert!(set.capacity() >= 100);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">capacity</span>()
}
<span class="doccomment">/// Reserves capacity for at least `additional` more elements to be inserted</span>
<span class="doccomment">/// in the `HashSet`. The collection may reserve more space to avoid</span>
<span class="doccomment">/// frequent reallocations.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the new allocation size overflows `usize`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let mut set: HashSet<i32> = HashSet::new();</span>
<span class="doccomment">/// set.reserve(10);</span>
<span class="doccomment">/// assert!(set.capacity() >= 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">reserve</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">additional</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">reserve</span>(<span class="ident">additional</span>)
}
<span class="doccomment">/// Shrinks the capacity of the set as much as possible. It will drop</span>
<span class="doccomment">/// down as much as possible while maintaining the internal rules</span>
<span class="doccomment">/// and possibly leaving some space in accordance with the resize policy.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set = HashSet::with_capacity(100);</span>
<span class="doccomment">/// set.insert(1);</span>
<span class="doccomment">/// set.insert(2);</span>
<span class="doccomment">/// assert!(set.capacity() >= 100);</span>
<span class="doccomment">/// set.shrink_to_fit();</span>
<span class="doccomment">/// assert!(set.capacity() >= 2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shrink_to_fit</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">shrink_to_fit</span>()
}
<span class="doccomment">/// Shrinks the capacity of the set with a lower limit. It will drop</span>
<span class="doccomment">/// down no lower than the supplied limit while maintaining the internal rules</span>
<span class="doccomment">/// and possibly leaving some space in accordance with the resize policy.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the current capacity is smaller than the supplied</span>
<span class="doccomment">/// minimum capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(shrink_to)]</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set = HashSet::with_capacity(100);</span>
<span class="doccomment">/// set.insert(1);</span>
<span class="doccomment">/// set.insert(2);</span>
<span class="doccomment">/// assert!(set.capacity() >= 100);</span>
<span class="doccomment">/// set.shrink_to(10);</span>
<span class="doccomment">/// assert!(set.capacity() >= 10);</span>
<span class="doccomment">/// set.shrink_to(0);</span>
<span class="doccomment">/// assert!(set.capacity() >= 2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"shrink_to"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"new API"</span>, <span class="ident">issue</span><span class="op">=</span><span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">shrink_to</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">min_capacity</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">shrink_to</span>(<span class="ident">min_capacity</span>)
}
<span class="doccomment">/// An iterator visiting all elements in arbitrary order.</span>
<span class="doccomment">/// The iterator element type is `&'a T`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">/// set.insert("a");</span>
<span class="doccomment">/// set.insert("b");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Will print in an arbitrary order.</span>
<span class="doccomment">/// for x in set.iter() {</span>
<span class="doccomment">/// println!("{}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Iter</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">keys</span>() }
}
<span class="doccomment">/// Visits the values representing the difference,</span>
<span class="doccomment">/// i.e. the values that are in `self` but not in `other`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let a: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = [4, 2, 3, 4].iter().cloned().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Can be seen as `a - b`.</span>
<span class="doccomment">/// for x in a.difference(&b) {</span>
<span class="doccomment">/// println!("{}", x); // Print 1</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let diff: HashSet<_> = a.difference(&b).collect();</span>
<span class="doccomment">/// assert_eq!(diff, [1].iter().collect());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Note that difference is not symmetric,</span>
<span class="doccomment">/// // and `b - a` means something else:</span>
<span class="doccomment">/// let diff: HashSet<_> = b.difference(&a).collect();</span>
<span class="doccomment">/// assert_eq!(diff, [4].iter().collect());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">difference</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">Difference</span> {
<span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>(),
<span class="ident">other</span>,
}
}
<span class="doccomment">/// Visits the values representing the symmetric difference,</span>
<span class="doccomment">/// i.e. the values that are in `self` or in `other` but not in both.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let a: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = [4, 2, 3, 4].iter().cloned().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Print 1, 4 in arbitrary order.</span>
<span class="doccomment">/// for x in a.symmetric_difference(&b) {</span>
<span class="doccomment">/// println!("{}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let diff1: HashSet<_> = a.symmetric_difference(&b).collect();</span>
<span class="doccomment">/// let diff2: HashSet<_> = b.symmetric_difference(&a).collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(diff1, diff2);</span>
<span class="doccomment">/// assert_eq!(diff1, [1, 4].iter().collect());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">symmetric_difference</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>,
<span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>)
<span class="op">-></span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">SymmetricDifference</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">difference</span>(<span class="ident">other</span>).<span class="ident">chain</span>(<span class="ident">other</span>.<span class="ident">difference</span>(<span class="self">self</span>)) }
}
<span class="doccomment">/// Visits the values representing the intersection,</span>
<span class="doccomment">/// i.e. the values that are both in `self` and `other`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let a: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = [4, 2, 3, 4].iter().cloned().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Print 2, 3 in arbitrary order.</span>
<span class="doccomment">/// for x in a.intersection(&b) {</span>
<span class="doccomment">/// println!("{}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let intersection: HashSet<_> = a.intersection(&b).collect();</span>
<span class="doccomment">/// assert_eq!(intersection, [2, 3].iter().collect());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">intersection</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">Intersection</span> {
<span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>(),
<span class="ident">other</span>,
}
}
<span class="doccomment">/// Visits the values representing the union,</span>
<span class="doccomment">/// i.e. all the values in `self` or `other`, without duplicates.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let a: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = [4, 2, 3, 4].iter().cloned().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Print 1, 2, 3, 4 in arbitrary order.</span>
<span class="doccomment">/// for x in a.union(&b) {</span>
<span class="doccomment">/// println!("{}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let union: HashSet<_> = a.union(&b).collect();</span>
<span class="doccomment">/// assert_eq!(union, [1, 2, 3, 4].iter().collect());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">union</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">Union</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">chain</span>(<span class="ident">other</span>.<span class="ident">difference</span>(<span class="self">self</span>)) }
}
<span class="doccomment">/// Returns the number of elements in the set.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut v = HashSet::new();</span>
<span class="doccomment">/// assert_eq!(v.len(), 0);</span>
<span class="doccomment">/// v.insert(1);</span>
<span class="doccomment">/// assert_eq!(v.len(), 1);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">len</span>()
}
<span class="doccomment">/// Returns true if the set contains no elements.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut v = HashSet::new();</span>
<span class="doccomment">/// assert!(v.is_empty());</span>
<span class="doccomment">/// v.insert(1);</span>
<span class="doccomment">/// assert!(!v.is_empty());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">is_empty</span>()
}
<span class="doccomment">/// Clears the set, returning all elements in an iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// assert!(!set.is_empty());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // print 1, 2, 3 in an arbitrary order</span>
<span class="doccomment">/// for i in set.drain() {</span>
<span class="doccomment">/// println!("{}", i);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(set.is_empty());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">drain</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Drain</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Drain</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">drain</span>() }
}
<span class="doccomment">/// Clears the set, removing all values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut v = HashSet::new();</span>
<span class="doccomment">/// v.insert(1);</span>
<span class="doccomment">/// v.clear();</span>
<span class="doccomment">/// assert!(v.is_empty());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">clear</span>()
}
<span class="doccomment">/// Returns `true` if the set contains a value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The value may be any borrowed form of the set's value type, but</span>
<span class="doccomment">/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for</span>
<span class="doccomment">/// the value type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let set: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// assert_eq!(set.contains(&1), true);</span>
<span class="doccomment">/// assert_eq!(set.contains(&4), false);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Eq`]: ../../std/cmp/trait.Eq.html</span>
<span class="doccomment">/// [`Hash`]: ../../std/hash/trait.Hash.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="ident">bool</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>,
<span class="ident">Q</span>: <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Eq</span>
{
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">contains_key</span>(<span class="ident">value</span>)
}
<span class="doccomment">/// Returns a reference to the value in the set, if any, that is equal to the given value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The value may be any borrowed form of the set's value type, but</span>
<span class="doccomment">/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for</span>
<span class="doccomment">/// the value type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let set: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// assert_eq!(set.get(&2), Some(&2));</span>
<span class="doccomment">/// assert_eq!(set.get(&4), None);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Eq`]: ../../std/cmp/trait.Eq.html</span>
<span class="doccomment">/// [`Hash`]: ../../std/hash/trait.Hash.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_recovery"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>,
<span class="ident">Q</span>: <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Eq</span>
{
<span class="ident">Recover</span>::<span class="ident">get</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">map</span>, <span class="ident">value</span>)
}
<span class="doccomment">/// Returns `true` if `self` has no elements in common with `other`.</span>
<span class="doccomment">/// This is equivalent to checking for an empty intersection.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// let mut b = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(a.is_disjoint(&b), true);</span>
<span class="doccomment">/// b.insert(4);</span>
<span class="doccomment">/// assert_eq!(a.is_disjoint(&b), true);</span>
<span class="doccomment">/// b.insert(1);</span>
<span class="doccomment">/// assert_eq!(a.is_disjoint(&b), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="op">!</span><span class="ident">other</span>.<span class="ident">contains</span>(<span class="ident">v</span>))
}
<span class="doccomment">/// Returns `true` if the set is a subset of another,</span>
<span class="doccomment">/// i.e. `other` contains at least all the values in `self`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let sup: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(set.is_subset(&sup), true);</span>
<span class="doccomment">/// set.insert(2);</span>
<span class="doccomment">/// assert_eq!(set.is_subset(&sup), true);</span>
<span class="doccomment">/// set.insert(4);</span>
<span class="doccomment">/// assert_eq!(set.is_subset(&sup), false);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="ident">other</span>.<span class="ident">contains</span>(<span class="ident">v</span>))
}
<span class="doccomment">/// Returns `true` if the set is a superset of another,</span>
<span class="doccomment">/// i.e. `self` contains at least all the values in `other`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let sub: HashSet<_> = [1, 2].iter().cloned().collect();</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(set.is_superset(&sub), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// set.insert(0);</span>
<span class="doccomment">/// set.insert(1);</span>
<span class="doccomment">/// assert_eq!(set.is_superset(&sub), false);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// set.insert(2);</span>
<span class="doccomment">/// assert_eq!(set.is_superset(&sub), true);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">other</span>.<span class="ident">is_subset</span>(<span class="self">self</span>)
}
<span class="doccomment">/// Adds a value to the set.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the set did not have this value present, `true` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the set did have this value present, `false` is returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(set.insert(2), true);</span>
<span class="doccomment">/// assert_eq!(set.insert(2), false);</span>
<span class="doccomment">/// assert_eq!(set.len(), 1);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">insert</span>(<span class="ident">value</span>, ()).<span class="ident">is_none</span>()
}
<span class="doccomment">/// Adds a value to the set, replacing the existing value, if any, that is equal to the given</span>
<span class="doccomment">/// one. Returns the replaced value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">/// set.insert(Vec::<i32>::new());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(set.get(&[][..]).unwrap().capacity(), 0);</span>
<span class="doccomment">/// set.replace(Vec::with_capacity(10));</span>
<span class="doccomment">/// assert_eq!(set.get(&[][..]).unwrap().capacity(), 10);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_recovery"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Recover</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">map</span>, <span class="ident">value</span>)
}
<span class="doccomment">/// Removes a value from the set. Returns `true` if the value was</span>
<span class="doccomment">/// present in the set.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The value may be any borrowed form of the set's value type, but</span>
<span class="doccomment">/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for</span>
<span class="doccomment">/// the value type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// set.insert(2);</span>
<span class="doccomment">/// assert_eq!(set.remove(&2), true);</span>
<span class="doccomment">/// assert_eq!(set.remove(&2), false);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Eq`]: ../../std/cmp/trait.Eq.html</span>
<span class="doccomment">/// [`Hash`]: ../../std/hash/trait.Hash.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="ident">bool</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>,
<span class="ident">Q</span>: <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Eq</span>
{
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">remove</span>(<span class="ident">value</span>).<span class="ident">is_some</span>()
}
<span class="doccomment">/// Removes and returns the value in the set, if any, that is equal to the given one.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The value may be any borrowed form of the set's value type, but</span>
<span class="doccomment">/// [`Hash`] and [`Eq`] on the borrowed form *must* match those for</span>
<span class="doccomment">/// the value type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut set: HashSet<_> = [1, 2, 3].iter().cloned().collect();</span>
<span class="doccomment">/// assert_eq!(set.take(&2), Some(2));</span>
<span class="doccomment">/// assert_eq!(set.take(&2), None);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Eq`]: ../../std/cmp/trait.Eq.html</span>
<span class="doccomment">/// [`Hash`]: ../../std/hash/trait.Hash.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"set_recovery"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">take</span><span class="op"><</span><span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">value</span>: <span class="kw-2">&</span><span class="ident">Q</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Borrow</span><span class="op"><</span><span class="ident">Q</span><span class="op">></span>,
<span class="ident">Q</span>: <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Eq</span>
{
<span class="ident">Recover</span>::<span class="ident">take</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">map</span>, <span class="ident">value</span>)
}
<span class="doccomment">/// Retains only the elements specified by the predicate.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// In other words, remove all elements `e` such that `f(&e)` returns `false`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let xs = [1,2,3,4,5,6];</span>
<span class="doccomment">/// let mut set: HashSet<i32> = xs.iter().cloned().collect();</span>
<span class="doccomment">/// set.retain(|&k| k % 2 == 0);</span>
<span class="doccomment">/// assert_eq!(set.len(), 3);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"retain_hash_collection"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.18.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">retain</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">f</span>: <span class="ident">F</span>)
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>
{
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">k</span>, <span class="kw">_</span><span class="op">|</span> <span class="ident">f</span>(<span class="ident">k</span>));
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">len</span>() {
<span class="kw">return</span> <span class="bool-val">false</span>;
}
<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">all</span>(<span class="op">|</span><span class="ident">key</span><span class="op">|</span> <span class="ident">other</span>.<span class="ident">contains</span>(<span class="ident">key</span>))
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_set</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">iter</span>()).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FromIterator</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="kw">fn</span> <span class="ident">from_iter</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="ident">iter</span>: <span class="ident">I</span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">with_hasher</span>(<span class="ident">Default</span>::<span class="ident">default</span>());
<span class="ident">set</span>.<span class="ident">extend</span>(<span class="ident">iter</span>);
<span class="ident">set</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) {
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">extend</span>(<span class="ident">iter</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">k</span><span class="op">|</span> (<span class="ident">k</span>, ())));
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"hash_extend_copy"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.4.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Extend</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Copy</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">extend</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op"><</span><span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">>></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">iter</span>: <span class="ident">I</span>) {
<span class="self">self</span>.<span class="ident">extend</span>(<span class="ident">iter</span>.<span class="ident">into_iter</span>().<span class="ident">cloned</span>());
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="doccomment">/// Creates an empty `HashSet<T, S>` with the `Default` value for the hasher.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">HashSet</span> { <span class="ident">map</span>: <span class="ident">HashMap</span>::<span class="ident">default</span>() }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">BitOr</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Clone</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>;
<span class="doccomment">/// Returns the union of `self` and `rhs` as a new `HashSet<T, S>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a: HashSet<_> = vec![1, 2, 3].into_iter().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = vec![3, 4, 5].into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let set = &a | &b;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut i = 0;</span>
<span class="doccomment">/// let expected = [1, 2, 3, 4, 5];</span>
<span class="doccomment">/// for x in &set {</span>
<span class="doccomment">/// assert!(expected.contains(x));</span>
<span class="doccomment">/// i += 1;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(i, expected.len());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">bitor</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">union</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">BitAnd</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Clone</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>;
<span class="doccomment">/// Returns the intersection of `self` and `rhs` as a new `HashSet<T, S>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a: HashSet<_> = vec![1, 2, 3].into_iter().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = vec![2, 3, 4].into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let set = &a & &b;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut i = 0;</span>
<span class="doccomment">/// let expected = [2, 3];</span>
<span class="doccomment">/// for x in &set {</span>
<span class="doccomment">/// assert!(expected.contains(x));</span>
<span class="doccomment">/// i += 1;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(i, expected.len());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">bitand</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">intersection</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">BitXor</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Clone</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>;
<span class="doccomment">/// Returns the symmetric difference of `self` and `rhs` as a new `HashSet<T, S>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a: HashSet<_> = vec![1, 2, 3].into_iter().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = vec![3, 4, 5].into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let set = &a ^ &b;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut i = 0;</span>
<span class="doccomment">/// let expected = [1, 2, 4, 5];</span>
<span class="doccomment">/// for x in &set {</span>
<span class="doccomment">/// assert!(expected.contains(x));</span>
<span class="doccomment">/// i += 1;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(i, expected.len());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">bitxor</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">symmetric_difference</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'b</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Sub</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'b</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">>></span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span> <span class="op">+</span> <span class="ident">Clone</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span> <span class="op">+</span> <span class="ident">Default</span>
{
<span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>;
<span class="doccomment">/// Returns the difference of `self` and `rhs` as a new `HashSet<T, S>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let a: HashSet<_> = vec![1, 2, 3].into_iter().collect();</span>
<span class="doccomment">/// let b: HashSet<_> = vec![3, 4, 5].into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let set = &a - &b;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut i = 0;</span>
<span class="doccomment">/// let expected = [1, 2];</span>
<span class="doccomment">/// for x in &set {</span>
<span class="doccomment">/// assert!(expected.contains(x));</span>
<span class="doccomment">/// i += 1;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(i, expected.len());</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">rhs</span>: <span class="kw-2">&</span><span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">difference</span>(<span class="ident">rhs</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>()
}
}
<span class="doccomment">/// An iterator over the items of a `HashSet`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`iter`] method on [`HashSet`].</span>
<span class="doccomment">/// See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`iter`]: struct.HashSet.html#method.iter</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">iter</span>: <span class="ident">Keys</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, ()<span class="op">></span>,
}
<span class="doccomment">/// An owning iterator over the items of a `HashSet`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`into_iter`] method on [`HashSet`][`HashSet`]</span>
<span class="doccomment">/// (provided by the `IntoIterator` trait). See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`into_iter`]: struct.HashSet.html#method.into_iter</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="ident">iter</span>: <span class="ident">map</span>::<span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span>, ()<span class="op">></span>,
}
<span class="doccomment">/// A draining iterator over the items of a `HashSet`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`drain`] method on [`HashSet`].</span>
<span class="doccomment">/// See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`drain`]: struct.HashSet.html#method.drain</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">iter</span>: <span class="ident">map</span>::<span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>, ()<span class="op">></span>,
}
<span class="doccomment">/// A lazy iterator producing elements in the intersection of `HashSet`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`intersection`] method on [`HashSet`].</span>
<span class="doccomment">/// See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`intersection`]: struct.HashSet.html#method.intersection</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">S</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="comment">// iterator of the first set</span>
<span class="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="comment">// the second set</span>
<span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>,
}
<span class="doccomment">/// A lazy iterator producing elements in the difference of `HashSet`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`difference`] method on [`HashSet`].</span>
<span class="doccomment">/// See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`difference`]: struct.HashSet.html#method.difference</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">S</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="comment">// iterator of the first set</span>
<span class="ident">iter</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="comment">// the second set</span>
<span class="ident">other</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>,
}
<span class="doccomment">/// A lazy iterator producing elements in the symmetric difference of `HashSet`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`symmetric_difference`] method on</span>
<span class="doccomment">/// [`HashSet`]. See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`symmetric_difference`]: struct.HashSet.html#method.symmetric_difference</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">S</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">iter</span>: <span class="ident">Chain</span><span class="op"><</span><span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>, <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">>></span>,
}
<span class="doccomment">/// A lazy iterator producing elements in the union of `HashSet`s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`union`] method on [`HashSet`].</span>
<span class="doccomment">/// See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`HashSet`]: struct.HashSet.html</span>
<span class="doccomment">/// [`union`]: struct.HashSet.html#method.union</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">S</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">iter</span>: <span class="ident">Chain</span><span class="op"><</span><span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">>></span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="doccomment">/// Creates a consuming iterator, that is, one that moves each value out</span>
<span class="doccomment">/// of the set in arbitrary order. The set cannot be used after calling</span>
<span class="doccomment">/// this.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::HashSet;</span>
<span class="doccomment">/// let mut set = HashSet::new();</span>
<span class="doccomment">/// set.insert("a".to_string());</span>
<span class="doccomment">/// set.insert("b".to_string());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Not possible to collect to a Vec<String> with a regular `.iter()`.</span>
<span class="doccomment">/// let v: Vec<String> = set.into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Will print in an arbitrary order.</span>
<span class="doccomment">/// for x in &v {</span>
<span class="doccomment">/// println!("{}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">IntoIter</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">into_iter</span>() }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="ident">Iter</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>() }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">K</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">K</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>()
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">len</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">K</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>)
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">len</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">K</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">entries_iter</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>
.<span class="ident">inner</span>
.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>);
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="ident">entries_iter</span>).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">K</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">K</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>)
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">usize</span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">len</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">K</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">let</span> <span class="ident">entries_iter</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>
.<span class="ident">inner</span>
.<span class="ident">iter</span>()
.<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">k</span>);
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="ident">entries_iter</span>).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">Intersection</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>(), ..<span class="kw-2">*</span><span class="self">self</span> }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">elt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">other</span>.<span class="ident">contains</span>(<span class="ident">elt</span>) {
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">elt</span>);
}
}
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">upper</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>();
(<span class="number">0</span>, <span class="ident">upper</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">Difference</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>(), ..<span class="kw-2">*</span><span class="self">self</span> }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">elt</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>()<span class="question-mark">?</span>;
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">other</span>.<span class="ident">contains</span>(<span class="ident">elt</span>) {
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">elt</span>);
}
}
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="kw">let</span> (<span class="kw">_</span>, <span class="ident">upper</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>();
(<span class="number">0</span>, <span class="ident">upper</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">SymmetricDifference</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>() }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>()
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> {
<span class="ident">Union</span> { <span class="ident">iter</span>: <span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">clone</span>() }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"fused"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_list</span>().<span class="ident">entries</span>(<span class="self">self</span>.<span class="ident">clone</span>()).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">S</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">Eq</span> <span class="op">+</span> <span class="ident">Hash</span>,
<span class="ident">S</span>: <span class="ident">BuildHasher</span>
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">next</span>()
}
<span class="kw">fn</span> <span class="ident">size_hint</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> (<span class="ident">usize</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">iter</span>.<span class="ident">size_hint</span>()
}
}
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>
<span class="kw">fn</span> <span class="ident">assert_covariance</span>() {
<span class="kw">fn</span> <span class="ident">set</span><span class="op"><</span><span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span><span class="op">></span>) <span class="op">-></span> <span class="ident">HashSet</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">into_iter</span><span class="op"><</span><span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">IntoIter</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span><span class="op">></span>) <span class="op">-></span> <span class="ident">IntoIter</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span>)
<span class="op">-></span> <span class="ident">Difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">symmetric_difference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span>)
<span class="op">-></span> <span class="ident">SymmetricDifference</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span>)
<span class="op">-></span> <span class="ident">Intersection</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="lifetime">'new</span><span class="op">></span>(<span class="ident">v</span>: <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span>)
<span class="op">-></span> <span class="ident">Union</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span>, <span class="ident">RandomState</span><span class="op">></span> {
<span class="ident">v</span>
}
<span class="kw">fn</span> <span class="ident">drain</span><span class="op"><</span><span class="lifetime">'new</span><span class="op">></span>(<span class="ident">d</span>: <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'static</span>, <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Drain</span><span class="op"><</span><span class="lifetime">'new</span>, <span class="kw-2">&</span><span class="lifetime">'new</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">d</span>
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">test_set</span> {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">HashSet</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw">super</span>::<span class="ident">map</span>::<span class="ident">RandomState</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_zero_capacities</span>() {
<span class="kw">type</span> <span class="ident">HS</span> <span class="op">=</span> <span class="ident">HashSet</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span>;
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">default</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">with_hasher</span>(<span class="ident">RandomState</span>::<span class="ident">new</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">with_capacity</span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">with_capacity_and_hasher</span>(<span class="number">0</span>, <span class="ident">RandomState</span>::<span class="ident">new</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">new</span>();
<span class="ident">s</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">s</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="ident">s</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="number">1</span>);
<span class="ident">s</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="number">2</span>);
<span class="ident">s</span>.<span class="ident">shrink_to_fit</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HS</span>::<span class="ident">new</span>();
<span class="ident">s</span>.<span class="ident">reserve</span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>(), <span class="number">0</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_disjoint</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">xs</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ys</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">ys</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">xs</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">ys</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">xs</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">insert</span>(<span class="number">7</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">insert</span>(<span class="number">19</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">insert</span>(<span class="number">4</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">insert</span>(<span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">insert</span>(<span class="op">-</span><span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">xs</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">ys</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">xs</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ys</span>.<span class="ident">insert</span>(<span class="number">7</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">xs</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">ys</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">ys</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">xs</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_subset_and_superset</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">0</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">7</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">0</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">7</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">19</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">250</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">200</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">a</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">b</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">a</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">b</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">b</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">a</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">b</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">a</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">b</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">a</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">b</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">b</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">a</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">a</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_iterate</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">32</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="ident">i</span>));
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">observed</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">k</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">a</span> {
<span class="ident">observed</span> <span class="op">|=</span> <span class="number">1</span> <span class="op"><<</span> <span class="kw-2">*</span><span class="ident">k</span>;
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">observed</span>, <span class="number">0xFFFF_FFFF</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_intersection</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">77</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">103</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="op">-</span><span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">77</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="op">-</span><span class="number">9</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="op">-</span><span class="number">42</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [<span class="number">3</span>, <span class="number">5</span>, <span class="number">11</span>, <span class="number">77</span>];
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">intersection</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">expected</span>.<span class="ident">contains</span>(<span class="ident">x</span>));
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">expected</span>.<span class="ident">len</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_difference</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">9</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">9</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">5</span>, <span class="number">11</span>];
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">difference</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">expected</span>.<span class="ident">contains</span>(<span class="ident">x</span>));
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">expected</span>.<span class="ident">len</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_symmetric_difference</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">9</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="op">-</span><span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">9</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">14</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">22</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [<span class="op">-</span><span class="number">2</span>, <span class="number">1</span>, <span class="number">5</span>, <span class="number">11</span>, <span class="number">14</span>, <span class="number">22</span>];
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">symmetric_difference</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">expected</span>.<span class="ident">contains</span>(<span class="ident">x</span>));
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">expected</span>.<span class="ident">len</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_union</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">9</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">11</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">16</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">19</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">24</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="op">-</span><span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">9</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">13</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">19</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> [<span class="op">-</span><span class="number">2</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">9</span>, <span class="number">11</span>, <span class="number">13</span>, <span class="number">16</span>, <span class="number">19</span>, <span class="number">24</span>];
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">union</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">expected</span>.<span class="ident">contains</span>(<span class="ident">x</span>));
<span class="ident">i</span> <span class="op">+=</span> <span class="number">1</span>
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">expected</span>.<span class="ident">len</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_from_iter</span>() {
<span class="kw">let</span> <span class="ident">xs</span> <span class="op">=</span> [<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="number">7</span>, <span class="number">8</span>, <span class="number">9</span>];
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">xs</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">xs</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">contains</span>(<span class="ident">x</span>));
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_move_iter</span>() {
<span class="kw">let</span> <span class="ident">hs</span> <span class="op">=</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hs</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="ident">hs</span>.<span class="ident">insert</span>(<span class="string">'a'</span>);
<span class="ident">hs</span>.<span class="ident">insert</span>(<span class="string">'b'</span>);
<span class="ident">hs</span>
};
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">hs</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">char</span><span class="op">>></span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">v</span> <span class="op">==</span> [<span class="string">'a'</span>, <span class="string">'b'</span>] <span class="op">||</span> <span class="ident">v</span> <span class="op">==</span> [<span class="string">'b'</span>, <span class="string">'a'</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_eq</span>() {
<span class="comment">// These constants once happened to expose a bug in insert().</span>
<span class="comment">// I'm keeping them around to prevent a regression.</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s1</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="ident">s1</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">s1</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="ident">s1</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s2</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="ident">s2</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">s2</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s1</span> <span class="op">!=</span> <span class="ident">s2</span>);
<span class="ident">s2</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s1</span>, <span class="ident">s2</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_show</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="ident">empty</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>();
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="kw">let</span> <span class="ident">set_str</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">set</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set_str</span> <span class="op">==</span> <span class="string">"{1, 2}"</span> <span class="op">||</span> <span class="ident">set_str</span> <span class="op">==</span> <span class="string">"{2, 1}"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="macro">format</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">empty</span>), <span class="string">"{}"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_trivial_drain</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>();
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="ident">s</span>.<span class="ident">drain</span>() {}
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_empty</span>());
<span class="ident">drop</span>(<span class="ident">s</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>();
<span class="ident">drop</span>(<span class="ident">s</span>.<span class="ident">drain</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_empty</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_drain</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> (<span class="number">1</span>..<span class="number">100</span>).<span class="ident">collect</span>();
<span class="comment">// try this a bunch of times to make sure we don't screw up internal state.</span>
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">20</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">len</span>(), <span class="number">99</span>);
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_i</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">drain</span>();
<span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">x</span>) <span class="kw">in</span> <span class="ident">d</span>.<span class="ident">by_ref</span>().<span class="ident">take</span>(<span class="number">50</span>).<span class="ident">enumerate</span>() {
<span class="ident">last_i</span> <span class="op">=</span> <span class="ident">i</span>;
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">x</span> <span class="op">!=</span> <span class="number">0</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">last_i</span>, <span class="number">49</span>);
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">s</span> {
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"s should be empty!"</span>);
}
<span class="comment">// reset to try again.</span>
<span class="ident">s</span>.<span class="ident">extend</span>(<span class="number">1</span>..<span class="number">100</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_replace</span>() {
<span class="kw">use</span> <span class="ident">hash</span>;
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">Foo</span>(<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>, <span class="ident">i32</span>);
<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Foo</span> {
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="self">Self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="number">0</span> <span class="op">==</span> <span class="ident">other</span>.<span class="number">0</span>
}
}
<span class="kw">impl</span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">Foo</span> {}
<span class="kw">impl</span> <span class="ident">hash</span>::<span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">Foo</span> {
<span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span>: <span class="ident">hash</span>::<span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">h</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">hash</span>(<span class="ident">h</span>);
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">replace</span>(<span class="ident">Foo</span>(<span class="string">"a"</span>, <span class="number">1</span>)), <span class="prelude-val">None</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">len</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">replace</span>(<span class="ident">Foo</span>(<span class="string">"a"</span>, <span class="number">2</span>)), <span class="prelude-val">Some</span>(<span class="ident">Foo</span>(<span class="string">"a"</span>, <span class="number">1</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">len</span>(), <span class="number">1</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">Foo</span>(<span class="string">"a"</span>, <span class="number">2</span>)));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>(), <span class="prelude-val">None</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_extend_ref</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">a</span>.<span class="ident">extend</span>(<span class="kw-2">&</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">4</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">4</span>));
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">5</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">6</span>);
<span class="ident">a</span>.<span class="ident">extend</span>(<span class="kw-2">&</span><span class="ident">b</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">6</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">4</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">5</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">6</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_retain</span>() {
<span class="kw">let</span> <span class="ident">xs</span> <span class="op">=</span> [<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> <span class="ident">set</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">xs</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="ident">set</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">k</span><span class="op">|</span> <span class="ident">k</span> <span class="op">%</span> <span class="number">2</span> <span class="op">==</span> <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">len</span>(), <span class="number">3</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">4</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">6</span>));
}
}
</pre>
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