<!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 `src/liballoc/collections/linked_list.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>linked_list.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../light1.35.0.css" id="themeStyle"><script src="../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow1.35.0.svg");}</style></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='../../../alloc/index.html'><img src='../../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel1.35.0.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><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! A doubly-linked list with owned nodes.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `LinkedList` allows pushing and popping elements at either end</span>
<span class="doccomment">//! in constant time.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Almost always it is better to use `Vec` or [`VecDeque`] instead of</span>
<span class="doccomment">//! [`LinkedList`]. In general, array-based containers are faster,</span>
<span class="doccomment">//! more memory efficient and make better use of CPU cache.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`LinkedList`]: ../linked_list/struct.LinkedList.html</span>
<span class="doccomment">//! [`VecDeque`]: ../vec_deque/struct.VecDeque.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">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>::<span class="ident">Ordering</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">hash</span>::{<span class="ident">Hasher</span>, <span class="ident">Hash</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>::{<span class="ident">FromIterator</span>, <span class="ident">FusedIterator</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">marker</span>::<span class="ident">PhantomData</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>::<span class="ident">NonNull</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">boxed</span>::<span class="ident">Box</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">SpecExtend</span>;
<span class="doccomment">/// A doubly-linked list with owned nodes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `LinkedList` allows pushing and popping elements at either end</span>
<span class="doccomment">/// in constant time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Almost always it is better to use `Vec` or `VecDeque` instead of</span>
<span class="doccomment">/// `LinkedList`. In general, array-based containers are faster,</span>
<span class="doccomment">/// more memory efficient and make better use of CPU cache.</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">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">head</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">tail</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">len</span>: <span class="ident">usize</span>,
<span class="ident">marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
}
<span class="kw">struct</span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">next</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">prev</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">element</span>: <span class="ident">T</span>,
}
<span class="doccomment">/// An iterator over the elements of a `LinkedList`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`iter`] method on [`LinkedList`]. See its</span>
<span class="doccomment">/// documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`iter`]: struct.LinkedList.html#method.iter</span>
<span class="doccomment">/// [`LinkedList`]: struct.LinkedList.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">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">head</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">tail</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">len</span>: <span class="ident">usize</span>,
<span class="ident">marker</span>: <span class="ident">PhantomData</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</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">'_</span>, <span class="ident">T</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="lifetime">'_</span><span class="op">></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_tuple</span>(<span class="string">"Iter"</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">len</span>)
.<span class="ident">finish</span>()
}
}
<span class="comment">// FIXME(#26925) Remove in favor of `#[derive(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="ident">T</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">'_</span>, <span class="ident">T</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="self">Self</span> {
<span class="ident">Iter</span> { ..<span class="kw-2">*</span><span class="self">self</span> }
}
}
<span class="doccomment">/// A mutable iterator over the elements of a `LinkedList`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`iter_mut`] method on [`LinkedList`]. See its</span>
<span class="doccomment">/// documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`iter_mut`]: struct.LinkedList.html#method.iter_mut</span>
<span class="doccomment">/// [`LinkedList`]: struct.LinkedList.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">struct</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">list</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">head</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">tail</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">len</span>: <span class="ident">usize</span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</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">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</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="lifetime">'_</span><span class="op">></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_tuple</span>(<span class="string">"IterMut"</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">list</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">len</span>)
.<span class="ident">finish</span>()
}
}
<span class="doccomment">/// An owning iterator over the elements of a `LinkedList`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This `struct` is created by the [`into_iter`] method on [`LinkedList`][`LinkedList`]</span>
<span class="doccomment">/// (provided by the `IntoIterator` trait). See its documentation for more.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`into_iter`]: struct.LinkedList.html#method.into_iter</span>
<span class="doccomment">/// [`LinkedList`]: struct.LinkedList.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">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">list</span>: <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</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">"collection_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.17.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</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">T</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="lifetime">'_</span><span class="op">></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_tuple</span>(<span class="string">"IntoIter"</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">list</span>)
.<span class="ident">finish</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">element</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="self">Self</span> {
<span class="ident">Node</span> {
<span class="ident">next</span>: <span class="prelude-val">None</span>,
<span class="ident">prev</span>: <span class="prelude-val">None</span>,
<span class="ident">element</span>,
}
}
<span class="kw">fn</span> <span class="ident">into_element</span>(<span class="self">self</span>: <span class="ident">Box</span><span class="op"><</span><span class="self">Self</span><span class="op">></span>) <span class="op">-></span> <span class="ident">T</span> {
<span class="self">self</span>.<span class="ident">element</span>
}
}
<span class="comment">// private methods</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Adds the given node to the front of the list.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">push_front_node</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">node</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>) {
<span class="kw">unsafe</span> {
<span class="ident">node</span>.<span class="ident">next</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span>;
<span class="ident">node</span>.<span class="ident">prev</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">into_raw_non_null</span>(<span class="ident">node</span>));
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">head</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">node</span>,
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">head</span>) <span class="op">=></span> <span class="ident">head</span>.<span class="ident">as_mut</span>().<span class="ident">prev</span> <span class="op">=</span> <span class="ident">node</span>,
}
<span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">node</span>;
<span class="self">self</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
}
}
<span class="doccomment">/// Removes and returns the node at the front of the list.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pop_front_node</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">Box</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">from_raw</span>(<span class="ident">node</span>.<span class="ident">as_ptr</span>());
<span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">next</span>;
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">head</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="prelude-val">None</span>,
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">head</span>) <span class="op">=></span> <span class="ident">head</span>.<span class="ident">as_mut</span>().<span class="ident">prev</span> <span class="op">=</span> <span class="prelude-val">None</span>,
}
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="ident">node</span>
})
}
<span class="doccomment">/// Adds the given node to the back of the list.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">push_back_node</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">node</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>) {
<span class="kw">unsafe</span> {
<span class="ident">node</span>.<span class="ident">next</span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="ident">node</span>.<span class="ident">prev</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">tail</span>;
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">into_raw_non_null</span>(<span class="ident">node</span>));
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">tail</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">node</span>,
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">tail</span>) <span class="op">=></span> <span class="ident">tail</span>.<span class="ident">as_mut</span>().<span class="ident">next</span> <span class="op">=</span> <span class="ident">node</span>,
}
<span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">node</span>;
<span class="self">self</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
}
}
<span class="doccomment">/// Removes and returns the node at the back of the list.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">pop_back_node</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">Box</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="ident">Box</span>::<span class="ident">from_raw</span>(<span class="ident">node</span>.<span class="ident">as_ptr</span>());
<span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">prev</span>;
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">tail</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="prelude-val">None</span>,
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">tail</span>) <span class="op">=></span> <span class="ident">tail</span>.<span class="ident">as_mut</span>().<span class="ident">next</span> <span class="op">=</span> <span class="prelude-val">None</span>,
}
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="ident">node</span>
})
}
<span class="doccomment">/// Unlinks the specified node from the current list.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Warning: this will not check that the provided node belongs to the current list.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">unlink_node</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">node</span>: <span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>) {
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">as_mut</span>();
<span class="kw">match</span> <span class="ident">node</span>.<span class="ident">prev</span> {
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">prev</span>) <span class="op">=></span> <span class="ident">prev</span>.<span class="ident">as_mut</span>().<span class="ident">next</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">next</span>.<span class="ident">clone</span>(),
<span class="comment">// this node is the head node</span>
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">next</span>.<span class="ident">clone</span>(),
};
<span class="kw">match</span> <span class="ident">node</span>.<span class="ident">next</span> {
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">next</span>) <span class="op">=></span> <span class="ident">next</span>.<span class="ident">as_mut</span>().<span class="ident">prev</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">prev</span>.<span class="ident">clone</span>(),
<span class="comment">// this node is the tail node</span>
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">prev</span>.<span class="ident">clone</span>(),
};
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</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="op">></span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates an empty `LinkedList<T>`.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="self">Self</span> {
<span class="self">Self</span>::<span class="ident">new</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Creates an empty `LinkedList`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let list: LinkedList<u32> = LinkedList::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="self">Self</span> {
<span class="ident">LinkedList</span> {
<span class="ident">head</span>: <span class="prelude-val">None</span>,
<span class="ident">tail</span>: <span class="prelude-val">None</span>,
<span class="ident">len</span>: <span class="number">0</span>,
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
}
}
<span class="doccomment">/// Moves all elements from `other` to the end of the list.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This reuses all the nodes from `other` and moves them into `self`. After</span>
<span class="doccomment">/// this operation, `other` becomes empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time and O(1) memory.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list1 = LinkedList::new();</span>
<span class="doccomment">/// list1.push_back('a');</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list2 = LinkedList::new();</span>
<span class="doccomment">/// list2.push_back('b');</span>
<span class="doccomment">/// list2.push_back('c');</span>
<span class="doccomment">///</span>
<span class="doccomment">/// list1.append(&mut list2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = list1.iter();</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&'a'));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&'b'));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&'c'));</span>
<span class="doccomment">/// assert!(iter.next().is_none());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(list2.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">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">Self</span>) {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">tail</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>, <span class="ident">other</span>),
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">tail</span>) <span class="op">=></span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">other_head</span>) <span class="op">=</span> <span class="ident">other</span>.<span class="ident">head</span>.<span class="ident">take</span>() {
<span class="kw">unsafe</span> {
<span class="ident">tail</span>.<span class="ident">as_mut</span>().<span class="ident">next</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">other_head</span>);
<span class="ident">other_head</span>.<span class="ident">as_mut</span>().<span class="ident">prev</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">tail</span>);
}
<span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">other</span>.<span class="ident">tail</span>.<span class="ident">take</span>();
<span class="self">self</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">other</span>.<span class="ident">len</span>, <span class="number">0</span>);
}
}
}
}
<span class="doccomment">/// Provides a forward 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::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list: LinkedList<u32> = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// list.push_back(0);</span>
<span class="doccomment">/// list.push_back(1);</span>
<span class="doccomment">/// list.push_back(2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = list.iter();</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&0));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&1));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&2));</span>
<span class="doccomment">/// assert_eq!(iter.next(), None);</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">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="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">Iter</span> {
<span class="ident">head</span>: <span class="self">self</span>.<span class="ident">head</span>,
<span class="ident">tail</span>: <span class="self">self</span>.<span class="ident">tail</span>,
<span class="ident">len</span>: <span class="self">self</span>.<span class="ident">len</span>,
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
}
}
<span class="doccomment">/// Provides a forward iterator with mutable references.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list: LinkedList<u32> = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// list.push_back(0);</span>
<span class="doccomment">/// list.push_back(1);</span>
<span class="doccomment">/// list.push_back(2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for element in list.iter_mut() {</span>
<span class="doccomment">/// *element += 10;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = list.iter();</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&10));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&11));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(&12));</span>
<span class="doccomment">/// assert_eq!(iter.next(), None);</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">iter_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="ident">IterMut</span> {
<span class="ident">head</span>: <span class="self">self</span>.<span class="ident">head</span>,
<span class="ident">tail</span>: <span class="self">self</span>.<span class="ident">tail</span>,
<span class="ident">len</span>: <span class="self">self</span>.<span class="ident">len</span>,
<span class="ident">list</span>: <span class="self">self</span>,
}
}
<span class="doccomment">/// Returns `true` if the `LinkedList` is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">/// assert!(dl.is_empty());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front("foo");</span>
<span class="doccomment">/// assert!(!dl.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">"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">head</span>.<span class="ident">is_none</span>()
}
<span class="doccomment">/// Returns the length of the `LinkedList`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(2);</span>
<span class="doccomment">/// assert_eq!(dl.len(), 1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(1);</span>
<span class="doccomment">/// assert_eq!(dl.len(), 2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_back(3);</span>
<span class="doccomment">/// assert_eq!(dl.len(), 3);</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">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">len</span>
}
<span class="doccomment">/// Removes all elements from the `LinkedList`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(n) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(2);</span>
<span class="doccomment">/// dl.push_front(1);</span>
<span class="doccomment">/// assert_eq!(dl.len(), 2);</span>
<span class="doccomment">/// assert_eq!(dl.front(), Some(&1));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.clear();</span>
<span class="doccomment">/// assert_eq!(dl.len(), 0);</span>
<span class="doccomment">/// assert_eq!(dl.front(), None);</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">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">new</span>();
}
<span class="doccomment">/// Returns `true` if the `LinkedList` contains an element equal to the</span>
<span class="doccomment">/// given 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::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list: LinkedList<u32> = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// list.push_back(0);</span>
<span class="doccomment">/// list.push_back(1);</span>
<span class="doccomment">/// list.push_back(2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(list.contains(&0), true);</span>
<span class="doccomment">/// assert_eq!(list.contains(&10), 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">"linked_list_contains"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">x</span>: <span class="kw-2">&</span><span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>
<span class="kw">where</span> <span class="ident">T</span>: <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
{
<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">any</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span> <span class="op">==</span> <span class="ident">x</span>)
}
<span class="doccomment">/// Provides a reference to the front element, or `None` if the list is</span>
<span class="doccomment">/// empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">/// assert_eq!(dl.front(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(1);</span>
<span class="doccomment">/// assert_eq!(dl.front(), Some(&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">"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">front</span>(<span class="kw-2">&</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="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">node</span>.<span class="ident">as_ref</span>().<span class="ident">element</span>)
}
}
<span class="doccomment">/// Provides a mutable reference to the front element, or `None` if the list</span>
<span class="doccomment">/// is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">/// assert_eq!(dl.front(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(1);</span>
<span class="doccomment">/// assert_eq!(dl.front(), Some(&1));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// match dl.front_mut() {</span>
<span class="doccomment">/// None => {},</span>
<span class="doccomment">/// Some(x) => *x = 5,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(dl.front(), Some(&5));</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">front_mut</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="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">as_mut</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">node</span>.<span class="ident">as_mut</span>().<span class="ident">element</span>)
}
}
<span class="doccomment">/// Provides a reference to the back element, or `None` if the list is</span>
<span class="doccomment">/// empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">/// assert_eq!(dl.back(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_back(1);</span>
<span class="doccomment">/// assert_eq!(dl.back(), Some(&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">"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">back</span>(<span class="kw-2">&</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="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">as_ref</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw-2">&</span><span class="ident">node</span>.<span class="ident">as_ref</span>().<span class="ident">element</span>)
}
}
<span class="doccomment">/// Provides a mutable reference to the back element, or `None` if the list</span>
<span class="doccomment">/// is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">/// assert_eq!(dl.back(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_back(1);</span>
<span class="doccomment">/// assert_eq!(dl.back(), Some(&1));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// match dl.back_mut() {</span>
<span class="doccomment">/// None => {},</span>
<span class="doccomment">/// Some(x) => *x = 5,</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// assert_eq!(dl.back(), Some(&5));</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">back_mut</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="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">as_mut</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">node</span>.<span class="ident">as_mut</span>().<span class="ident">element</span>)
}
}
<span class="doccomment">/// Adds an element first in the list.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut dl = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(2);</span>
<span class="doccomment">/// assert_eq!(dl.front().unwrap(), &2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// dl.push_front(1);</span>
<span class="doccomment">/// assert_eq!(dl.front().unwrap(), &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">push_front</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">elt</span>: <span class="ident">T</span>) {
<span class="self">self</span>.<span class="ident">push_front_node</span>(<span class="kw">box</span> <span class="ident">Node</span>::<span class="ident">new</span>(<span class="ident">elt</span>));
}
<span class="doccomment">/// Removes the first element and returns it, or `None` if the list is</span>
<span class="doccomment">/// empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut d = LinkedList::new();</span>
<span class="doccomment">/// assert_eq!(d.pop_front(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// d.push_front(1);</span>
<span class="doccomment">/// d.push_front(3);</span>
<span class="doccomment">/// assert_eq!(d.pop_front(), Some(3));</span>
<span class="doccomment">/// assert_eq!(d.pop_front(), Some(1));</span>
<span class="doccomment">/// assert_eq!(d.pop_front(), None);</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">pop_front</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">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">pop_front_node</span>().<span class="ident">map</span>(<span class="ident">Node</span>::<span class="ident">into_element</span>)
}
<span class="doccomment">/// Appends an element to the back of a list.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut d = LinkedList::new();</span>
<span class="doccomment">/// d.push_back(1);</span>
<span class="doccomment">/// d.push_back(3);</span>
<span class="doccomment">/// assert_eq!(3, *d.back().unwrap());</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">push_back</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">elt</span>: <span class="ident">T</span>) {
<span class="self">self</span>.<span class="ident">push_back_node</span>(<span class="kw">box</span> <span class="ident">Node</span>::<span class="ident">new</span>(<span class="ident">elt</span>));
}
<span class="doccomment">/// Removes the last element from a list and returns it, or `None` if</span>
<span class="doccomment">/// it is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(1) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut d = LinkedList::new();</span>
<span class="doccomment">/// assert_eq!(d.pop_back(), None);</span>
<span class="doccomment">/// d.push_back(1);</span>
<span class="doccomment">/// d.push_back(3);</span>
<span class="doccomment">/// assert_eq!(d.pop_back(), Some(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">"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">pop_back</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">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">pop_back_node</span>().<span class="ident">map</span>(<span class="ident">Node</span>::<span class="ident">into_element</span>)
}
<span class="doccomment">/// Splits the list into two at the given index. Returns everything after the given index,</span>
<span class="doccomment">/// including the index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This operation should compute in O(n) time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if `at > len`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut d = LinkedList::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// d.push_front(1);</span>
<span class="doccomment">/// d.push_front(2);</span>
<span class="doccomment">/// d.push_front(3);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut splitted = d.split_off(2);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(splitted.pop_front(), Some(1));</span>
<span class="doccomment">/// assert_eq!(splitted.pop_front(), None);</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">split_off</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">at</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">at</span> <span class="op"><=</span> <span class="ident">len</span>, <span class="string">"Cannot split off at a nonexistent index"</span>);
<span class="kw">if</span> <span class="ident">at</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="ident">mem</span>::<span class="ident">replace</span>(<span class="self">self</span>, <span class="self">Self</span>::<span class="ident">new</span>());
} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">at</span> <span class="op">==</span> <span class="ident">len</span> {
<span class="kw">return</span> <span class="self">Self</span>::<span class="ident">new</span>();
}
<span class="comment">// Below, we iterate towards the `i-1`th node, either from the start or the end,</span>
<span class="comment">// depending on which would be faster.</span>
<span class="kw">let</span> <span class="ident">split_node</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">at</span> <span class="op">-</span> <span class="number">1</span> <span class="op"><=</span> <span class="ident">len</span> <span class="op">-</span> <span class="number">1</span> <span class="op">-</span> (<span class="ident">at</span> <span class="op">-</span> <span class="number">1</span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter_mut</span>();
<span class="comment">// instead of skipping using .skip() (which creates a new struct),</span>
<span class="comment">// we skip manually so we can access the head field without</span>
<span class="comment">// depending on implementation details of Skip</span>
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">at</span> <span class="op">-</span> <span class="number">1</span> {
<span class="ident">iter</span>.<span class="ident">next</span>();
}
<span class="ident">iter</span>.<span class="ident">head</span>
} <span class="kw">else</span> {
<span class="comment">// better off starting from the end</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">iter_mut</span>();
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">len</span> <span class="op">-</span> <span class="number">1</span> <span class="op">-</span> (<span class="ident">at</span> <span class="op">-</span> <span class="number">1</span>) {
<span class="ident">iter</span>.<span class="ident">next_back</span>();
}
<span class="ident">iter</span>.<span class="ident">tail</span>
};
<span class="comment">// The split node is the new tail node of the first part and owns</span>
<span class="comment">// the head of the second part.</span>
<span class="kw">let</span> <span class="ident">second_part_head</span>;
<span class="kw">unsafe</span> {
<span class="ident">second_part_head</span> <span class="op">=</span> <span class="ident">split_node</span>.<span class="ident">unwrap</span>().<span class="ident">as_mut</span>().<span class="ident">next</span>.<span class="ident">take</span>();
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">head</span>) <span class="op">=</span> <span class="ident">second_part_head</span> {
<span class="ident">head</span>.<span class="ident">as_mut</span>().<span class="ident">prev</span> <span class="op">=</span> <span class="prelude-val">None</span>;
}
}
<span class="kw">let</span> <span class="ident">second_part</span> <span class="op">=</span> <span class="ident">LinkedList</span> {
<span class="ident">head</span>: <span class="ident">second_part_head</span>,
<span class="ident">tail</span>: <span class="self">self</span>.<span class="ident">tail</span>,
<span class="ident">len</span>: <span class="ident">len</span> <span class="op">-</span> <span class="ident">at</span>,
<span class="ident">marker</span>: <span class="ident">PhantomData</span>,
};
<span class="comment">// Fix the tail ptr of the first part</span>
<span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">split_node</span>;
<span class="self">self</span>.<span class="ident">len</span> <span class="op">=</span> <span class="ident">at</span>;
<span class="ident">second_part</span>
}
<span class="doccomment">/// Creates an iterator which uses a closure to determine if an element should be removed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the closure returns true, then the element is removed and yielded.</span>
<span class="doccomment">/// If the closure returns false, the element will remain in the list and will not be yielded</span>
<span class="doccomment">/// by the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that `drain_filter` lets you mutate every element in the filter closure, regardless of</span>
<span class="doccomment">/// whether you choose to keep or remove it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Splitting a list into evens and odds, reusing the original list:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(drain_filter)]</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut numbers: LinkedList<u32> = LinkedList::new();</span>
<span class="doccomment">/// numbers.extend(&[1, 2, 3, 4, 5, 6, 8, 9, 11, 13, 14, 15]);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let evens = numbers.drain_filter(|x| *x % 2 == 0).collect::<LinkedList<_>>();</span>
<span class="doccomment">/// let odds = numbers;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(evens.into_iter().collect::<Vec<_>>(), vec![2, 4, 6, 8, 14]);</span>
<span class="doccomment">/// assert_eq!(odds.into_iter().collect::<Vec<_>>(), vec![1, 3, 5, 9, 11, 13, 15]);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain_filter"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"43244"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">drain_filter</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="ident">filter</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="ident">DrainFilter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>
{
<span class="comment">// avoid borrow issues.</span>
<span class="kw">let</span> <span class="ident">it</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">head</span>;
<span class="kw">let</span> <span class="ident">old_len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">len</span>;
<span class="ident">DrainFilter</span> {
<span class="ident">list</span>: <span class="self">self</span>,
<span class="ident">it</span>: <span class="ident">it</span>,
<span class="ident">pred</span>: <span class="ident">filter</span>,
<span class="ident">idx</span>: <span class="number">0</span>,
<span class="ident">old_len</span>: <span class="ident">old_len</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="attribute">#[<span class="ident">may_dangle</span>]</span> <span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">pop_front_node</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="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">T</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">T</span>;
<span class="attribute">#[<span class="ident">inline</span>]</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">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="comment">// Need an unbound lifetime to get 'a</span>
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">node</span>.<span class="ident">as_ptr</span>();
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">next</span>;
<span class="kw-2">&</span><span class="ident">node</span>.<span class="ident">element</span>
})
}
}
<span class="attribute">#[<span class="ident">inline</span>]</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">len</span>, <span class="prelude-val">Some</span>(<span class="self">self</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">"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="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</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="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</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">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="comment">// Need an unbound lifetime to get 'a</span>
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">node</span>.<span class="ident">as_ptr</span>();
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">prev</span>;
<span class="kw-2">&</span><span class="ident">node</span>.<span class="ident">element</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="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</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">"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">T</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">'_</span>, <span class="ident">T</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="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</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="kw-2">mut</span> <span class="ident">T</span>;
<span class="attribute">#[<span class="ident">inline</span>]</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="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="comment">// Need an unbound lifetime to get 'a</span>
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">node</span>.<span class="ident">as_ptr</span>();
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="ident">head</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">next</span>;
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">node</span>.<span class="ident">element</span>
})
}
}
<span class="attribute">#[<span class="ident">inline</span>]</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">len</span>, <span class="prelude-val">Some</span>(<span class="self">self</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">"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="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</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="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">tail</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw">unsafe</span> {
<span class="comment">// Need an unbound lifetime to get 'a</span>
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">node</span>.<span class="ident">as_ptr</span>();
<span class="self">self</span>.<span class="ident">len</span> <span class="op">-=</span> <span class="number">1</span>;
<span class="self">self</span>.<span class="ident">tail</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">prev</span>;
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">node</span>.<span class="ident">element</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="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</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">"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">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Inserts the given element just after the element most recently returned by `.next()`.</span>
<span class="doccomment">/// The inserted element does not appear in the iteration.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(linked_list_extras)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list: LinkedList<_> = vec![1, 3, 4].into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let mut it = list.iter_mut();</span>
<span class="doccomment">/// assert_eq!(it.next().unwrap(), &1);</span>
<span class="doccomment">/// // insert `2` after `1`</span>
<span class="doccomment">/// it.insert_next(2);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let vec: Vec<_> = list.into_iter().collect();</span>
<span class="doccomment">/// assert_eq!(vec, [1, 2, 3, 4]);</span>
<span class="doccomment">/// }</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">"linked_list_extras"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"this is probably better handled by a cursor type -- we'll see"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27794"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert_next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">element</span>: <span class="ident">T</span>) {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">head</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="self">self</span>.<span class="ident">list</span>.<span class="ident">push_back</span>(<span class="ident">element</span>),
<span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">head</span>) <span class="op">=></span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">prev</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">head</span>.<span class="ident">as_ref</span>().<span class="ident">prev</span> {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">list</span>.<span class="ident">push_front</span>(<span class="ident">element</span>),
<span class="prelude-val">Some</span>(<span class="ident">prev</span>) <span class="op">=></span> <span class="ident">prev</span>,
};
<span class="kw">let</span> <span class="ident">node</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">into_raw_non_null</span>(<span class="kw">box</span> <span class="ident">Node</span> {
<span class="ident">next</span>: <span class="prelude-val">Some</span>(<span class="ident">head</span>),
<span class="ident">prev</span>: <span class="prelude-val">Some</span>(<span class="ident">prev</span>),
<span class="ident">element</span>,
}));
<span class="ident">prev</span>.<span class="ident">as_mut</span>().<span class="ident">next</span> <span class="op">=</span> <span class="ident">node</span>;
<span class="ident">head</span>.<span class="ident">as_mut</span>().<span class="ident">prev</span> <span class="op">=</span> <span class="ident">node</span>;
<span class="self">self</span>.<span class="ident">list</span>.<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
},
}
}
<span class="doccomment">/// Provides a reference to the next element, without changing the iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(linked_list_extras)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::collections::LinkedList;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut list: LinkedList<_> = vec![1, 2, 3].into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut it = list.iter_mut();</span>
<span class="doccomment">/// assert_eq!(it.next().unwrap(), &1);</span>
<span class="doccomment">/// assert_eq!(it.peek_next().unwrap(), &2);</span>
<span class="doccomment">/// // We just peeked at 2, so it was not consumed from the iterator.</span>
<span class="doccomment">/// assert_eq!(it.next().unwrap(), &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">"linked_list_extras"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"this is probably better handled by a cursor type -- we'll see"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27794"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">peek_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="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">len</span> <span class="op">==</span> <span class="number">0</span> {
<span class="prelude-val">None</span>
} <span class="kw">else</span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">head</span>.<span class="ident">as_mut</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">node</span><span class="op">|</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">node</span>.<span class="ident">as_mut</span>().<span class="ident">element</span>)
}
}
}
}
<span class="doccomment">/// An iterator produced by calling `drain_filter` on LinkedList.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain_filter"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"43244"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">DrainFilter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span>, <span class="ident">F</span>: <span class="lifetime">'a</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>,
{
<span class="ident">list</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
<span class="ident">it</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">NonNull</span><span class="op"><</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span><span class="op">></span>,
<span class="ident">pred</span>: <span class="ident">F</span>,
<span class="ident">idx</span>: <span class="ident">usize</span>,
<span class="ident">old_len</span>: <span class="ident">usize</span>,
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain_filter"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"43244"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">DrainFilter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>,
{
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</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="ident">T</span><span class="op">></span> {
<span class="kw">while</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="kw-2">mut</span> <span class="ident">node</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">it</span> {
<span class="kw">unsafe</span> {
<span class="self">self</span>.<span class="ident">it</span> <span class="op">=</span> <span class="ident">node</span>.<span class="ident">as_ref</span>().<span class="ident">next</span>;
<span class="self">self</span>.<span class="ident">idx</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> (<span class="self">self</span>.<span class="ident">pred</span>)(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">node</span>.<span class="ident">as_mut</span>().<span class="ident">element</span>) {
<span class="self">self</span>.<span class="ident">list</span>.<span class="ident">unlink_node</span>(<span class="ident">node</span>);
<span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="ident">Box</span>::<span class="ident">from_raw</span>(<span class="ident">node</span>.<span class="ident">as_ptr</span>()).<span class="ident">element</span>);
}
}
}
<span class="prelude-val">None</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="number">0</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">old_len</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">idx</span>))
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain_filter"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"43244"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">F</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">DrainFilter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span>,
{
<span class="kw">fn</span> <span class="ident">drop</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">for_each</span>(<span class="ident">drop</span>);
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"drain_filter"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"recently added"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"43244"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">F</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">DrainFilter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</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="lifetime">'_</span><span class="op">></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_tuple</span>(<span class="string">"DrainFilter"</span>)
.<span class="ident">field</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">list</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="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="attribute">#[<span class="ident">inline</span>]</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">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">list</span>.<span class="ident">pop_front</span>()
}
<span class="attribute">#[<span class="ident">inline</span>]</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">list</span>.<span class="ident">len</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">list</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">"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="op">></span> <span class="ident">DoubleEndedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">next_back</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">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">list</span>.<span class="ident">pop_back</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="op">></span> <span class="ident">ExactSizeIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</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">"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">T</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">T</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="ident">T</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">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></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="self">Self</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">list</span> <span class="op">=</span> <span class="self">Self</span>::<span class="ident">new</span>();
<span class="ident">list</span>.<span class="ident">extend</span>(<span class="ident">iter</span>);
<span class="ident">list</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="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></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">/// Consumes the list into an iterator yielding elements by value.</span>
<span class="attribute">#[<span class="ident">inline</span>]</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">list</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="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">LinkedList</span><span class="op"><</span><span class="ident">T</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">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="lifetime">'a</span>, <span class="ident">T</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="kw-2">mut</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</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="kw-2">mut</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IterMut</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">IterMut</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_mut</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="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">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></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="op"><</span><span class="self">Self</span> <span class="kw">as</span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">I</span><span class="op">>></span>::<span class="ident">spec_extend</span>(<span class="self">self</span>, <span class="ident">iter</span>);
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">I</span>: <span class="ident">IntoIterator</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">I</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">I</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="ident">default</span> <span class="kw">fn</span> <span class="ident">spec_extend</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="ident">iter</span>.<span class="ident">into_iter</span>().<span class="ident">for_each</span>(<span class="kw">move</span> <span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">push_back</span>(<span class="ident">elt</span>));
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SpecExtend</span><span class="op"><</span><span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">spec_extend</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">ref</span> <span class="kw-2">mut</span> <span class="ident">other</span>: <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="self">self</span>.<span class="ident">append</span>(<span class="ident">other</span>);
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"extend_ref"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.2.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span> <span class="op">+</span> <span class="ident">Copy</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">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></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">PartialEq</span><span class="op">></span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></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="ident">len</span>() <span class="op">==</span> <span class="ident">other</span>.<span class="ident">len</span>() <span class="op">&&</span> <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">eq</span>(<span class="ident">other</span>)
}
<span class="kw">fn</span> <span class="ident">ne</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="ident">len</span>() <span class="op">!=</span> <span class="ident">other</span>.<span class="ident">len</span>() <span class="op">||</span> <span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">ne</span>(<span class="ident">other</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">Eq</span><span class="op">></span> <span class="ident">Eq</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</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="ident">T</span>: <span class="ident">PartialOrd</span><span class="op">></span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">partial_cmp</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="prelude-ty">Option</span><span class="op"><</span><span class="ident">Ordering</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">partial_cmp</span>(<span class="ident">other</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">Ord</span><span class="op">></span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">cmp</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">Ordering</span> {
<span class="self">self</span>.<span class="ident">iter</span>().<span class="ident">cmp</span>(<span class="ident">other</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">Clone</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</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="self">Self</span> {
<span class="self">self</span>.<span class="ident">iter</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="ident">T</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">LinkedList</span><span class="op"><</span><span class="ident">T</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="lifetime">'_</span><span class="op">></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">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">Hash</span><span class="op">></span> <span class="ident">Hash</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">hash</span><span class="op"><</span><span class="ident">H</span>: <span class="ident">Hasher</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">state</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">H</span>) {
<span class="self">self</span>.<span class="ident">len</span>().<span class="ident">hash</span>(<span class="ident">state</span>);
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="self">self</span> {
<span class="ident">elt</span>.<span class="ident">hash</span>(<span class="ident">state</span>);
}
}
}
<span class="comment">// Ensure that `LinkedList` and its read-only iterators are covariant in their type parameters.</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">a</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">LinkedList</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">LinkedList</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">x</span>
}
<span class="kw">fn</span> <span class="ident">b</span><span class="op"><</span><span class="lifetime">'i</span>, <span class="lifetime">'a</span><span class="op">></span>(<span class="ident">x</span>: <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'i</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">'i</span>, <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">x</span>
}
<span class="kw">fn</span> <span class="ident">c</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="ident">x</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">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="ident">x</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</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">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Sync</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">IterMut</span><span class="op"><</span><span class="lifetime">'_</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">vec</span>::<span class="ident">Vec</span>;
<span class="kw">use</span> <span class="ident">rand</span>::{<span class="ident">thread_rng</span>, <span class="ident">RngCore</span>};
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">LinkedList</span>, <span class="ident">Node</span>};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">fn</span> <span class="ident">list_from</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Clone</span><span class="op">></span>(<span class="ident">v</span>: <span class="kw-2">&</span>[<span class="ident">T</span>]) <span class="op">-></span> <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">v</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>()
}
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">check_links</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">list</span>: <span class="kw-2">&</span><span class="ident">LinkedList</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">len</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">last_ptr</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="op">=</span> <span class="prelude-val">None</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">node_ptr</span>: <span class="kw-2">&</span><span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">match</span> <span class="ident">list</span>.<span class="ident">head</span> {
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="comment">// tail node should also be None.</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">list</span>.<span class="ident">tail</span>.<span class="ident">is_none</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">list</span>.<span class="ident">len</span>);
<span class="kw">return</span>;
}
<span class="prelude-val">Some</span>(<span class="ident">node</span>) <span class="op">=></span> <span class="ident">node_ptr</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">node</span>.<span class="ident">as_ptr</span>(),
}
<span class="kw">loop</span> {
<span class="kw">match</span> (<span class="ident">last_ptr</span>, <span class="ident">node_ptr</span>.<span class="ident">prev</span>) {
(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) <span class="op">=></span> {}
(<span class="prelude-val">None</span>, <span class="kw">_</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"prev link for head"</span>),
(<span class="prelude-val">Some</span>(<span class="ident">p</span>), <span class="prelude-val">Some</span>(<span class="ident">pptr</span>)) <span class="op">=></span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">p</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">pptr</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>);
}
<span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"prev link is none, not good"</span>),
}
<span class="kw">match</span> <span class="ident">node_ptr</span>.<span class="ident">next</span> {
<span class="prelude-val">Some</span>(<span class="ident">next</span>) <span class="op">=></span> {
<span class="ident">last_ptr</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">node_ptr</span>);
<span class="ident">node_ptr</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">next</span>.<span class="ident">as_ptr</span>();
<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="ident">len</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">break</span>;
}
}
}
<span class="comment">// verify that the tail node points to the last node.</span>
<span class="kw">let</span> <span class="ident">tail</span> <span class="op">=</span> <span class="ident">list</span>.<span class="ident">tail</span>.<span class="ident">as_ref</span>().<span class="ident">expect</span>(<span class="string">"some tail node"</span>).<span class="ident">as_ref</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tail</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">node_ptr</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">Node</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>);
<span class="comment">// check that len matches interior links.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">len</span>, <span class="ident">list</span>.<span class="ident">len</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_append</span>() {
<span class="comment">// Empty to empty</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">m</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">n</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">len</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>.<span class="ident">len</span>(), <span class="number">0</span>);
}
<span class="comment">// Non-empty to empty</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">n</span>.<span class="ident">push_back</span>(<span class="number">2</span>);
<span class="ident">m</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">n</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">len</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">pop_back</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>.<span class="ident">len</span>(), <span class="number">0</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
}
<span class="comment">// Empty to non-empty</span>
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">m</span>.<span class="ident">push_back</span>(<span class="number">2</span>);
<span class="ident">m</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">n</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">len</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">pop_back</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>));
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
}
<span class="comment">// Non-empty to non-empty</span>
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</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="kw">let</span> <span class="ident">u</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">9</span>, <span class="number">8</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">list_from</span>(<span class="kw-2">&</span><span class="ident">v</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">list_from</span>(<span class="kw-2">&</span><span class="ident">u</span>);
<span class="ident">m</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">n</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sum</span> <span class="op">=</span> <span class="ident">v</span>;
<span class="ident">sum</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="ident">u</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">sum</span>.<span class="ident">len</span>(), <span class="ident">m</span>.<span class="ident">len</span>());
<span class="kw">for</span> <span class="ident">elt</span> <span class="kw">in</span> <span class="ident">sum</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">pop_front</span>(), <span class="prelude-val">Some</span>(<span class="ident">elt</span>))
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>.<span class="ident">len</span>(), <span class="number">0</span>);
<span class="comment">// let's make sure it's working properly, since we</span>
<span class="comment">// did some direct changes to private members</span>
<span class="ident">n</span>.<span class="ident">push_back</span>(<span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>.<span class="ident">len</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>.<span class="ident">pop_front</span>(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">n</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_insert_prev</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">list_from</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">2</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">8</span>]);
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">len</span>();
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">iter_mut</span>();
<span class="ident">it</span>.<span class="ident">insert_next</span>(<span class="op">-</span><span class="number">2</span>);
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">it</span>.<span class="ident">next</span>() {
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">break</span>,
<span class="prelude-val">Some</span>(<span class="ident">elt</span>) <span class="op">=></span> {
<span class="ident">it</span>.<span class="ident">insert_next</span>(<span class="kw-2">*</span><span class="ident">elt</span> <span class="op">+</span> <span class="number">1</span>);
<span class="kw">match</span> <span class="ident">it</span>.<span class="ident">peek_next</span>() {
<span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=></span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">x</span>, <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">+</span> <span class="number">2</span>),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">8</span>, <span class="kw-2">*</span><span class="ident">elt</span>),
}
}
}
}
<span class="ident">it</span>.<span class="ident">insert_next</span>(<span class="number">0</span>);
<span class="ident">it</span>.<span class="ident">insert_next</span>(<span class="number">1</span>);
}
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</span>.<span class="ident">len</span>(), <span class="number">3</span> <span class="op">+</span> <span class="ident">len</span> <span class="op">*</span> <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</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="kw">_</span><span class="op">>></span>(),
[<span class="op">-</span><span class="number">2</span>, <span class="number">0</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="number">0</span>, <span class="number">1</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">test_send</span>() {
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">list_from</span>(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">n</span>);
<span class="kw">let</span> <span class="ident">a</span>: <span class="kw-2">&</span>[<span class="kw">_</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span><span class="number">2</span>, <span class="kw-2">&</span><span class="number">3</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>, <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">n</span>.<span class="ident">iter</span>().<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">>></span>());
})
.<span class="ident">join</span>()
.<span class="ident">ok</span>()
.<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_fuzz</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">25</span> {
<span class="ident">fuzz_test</span>(<span class="number">3</span>);
<span class="ident">fuzz_test</span>(<span class="number">16</span>);
<span class="ident">fuzz_test</span>(<span class="number">189</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_26021</span>() {
<span class="comment">// There was a bug in split_off that failed to null out the RHS's head's prev ptr.</span>
<span class="comment">// This caused the RHS's dtor to walk up into the LHS at drop and delete all of</span>
<span class="comment">// its nodes.</span>
<span class="comment">//</span>
<span class="comment">// https://github.com/rust-lang/rust/issues/26021</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v1</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">v1</span>.<span class="ident">split_off</span>(<span class="number">3</span>); <span class="comment">// Dropping this now should not cause laundry consumption</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v1</span>.<span class="ident">len</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v1</span>.<span class="ident">iter</span>().<span class="ident">len</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v1</span>.<span class="ident">iter</span>().<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">>></span>().<span class="ident">len</span>(), <span class="number">3</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_split_off</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v1</span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="ident">v1</span>.<span class="ident">push_front</span>(<span class="number">1</span>);
<span class="comment">// test all splits</span>
<span class="kw">for</span> <span class="ident">ix</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">1</span> <span class="op">+</span> <span class="ident">v1</span>.<span class="ident">len</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">v1</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">split_off</span>(<span class="ident">ix</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">a</span>);
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">b</span>);
<span class="ident">a</span>.<span class="ident">extend</span>(<span class="ident">b</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v1</span>, <span class="ident">a</span>);
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">fn</span> <span class="ident">fuzz_test</span>(<span class="ident">sz</span>: <span class="ident">i32</span>) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span>: <span class="ident">LinkedList</span><span class="op"><</span><span class="kw">_</span><span class="op">></span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">sz</span> {
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="kw">let</span> <span class="ident">r</span>: <span class="ident">u8</span> <span class="op">=</span> <span class="ident">thread_rng</span>().<span class="ident">next_u32</span>() <span class="kw">as</span> <span class="ident">u8</span>;
<span class="kw">match</span> <span class="ident">r</span> <span class="op">%</span> <span class="number">6</span> {
<span class="number">0</span> <span class="op">=></span> {
<span class="ident">m</span>.<span class="ident">pop_back</span>();
<span class="ident">v</span>.<span class="ident">pop</span>();
}
<span class="number">1</span> <span class="op">=></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">v</span>.<span class="ident">is_empty</span>() {
<span class="ident">m</span>.<span class="ident">pop_front</span>();
<span class="ident">v</span>.<span class="ident">remove</span>(<span class="number">0</span>);
}
}
<span class="number">2</span> <span class="op">|</span> <span class="number">4</span> <span class="op">=></span> {
<span class="ident">m</span>.<span class="ident">push_front</span>(<span class="op">-</span><span class="ident">i</span>);
<span class="ident">v</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="op">-</span><span class="ident">i</span>);
}
<span class="number">3</span> <span class="op">|</span> <span class="number">5</span> <span class="op">|</span> <span class="kw">_</span> <span class="op">=></span> {
<span class="ident">m</span>.<span class="ident">push_back</span>(<span class="ident">i</span>);
<span class="ident">v</span>.<span class="ident">push</span>(<span class="ident">i</span>);
}
}
}
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</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">for</span> (<span class="ident">a</span>, <span class="kw-2">&</span><span class="ident">b</span>) <span class="kw">in</span> <span class="ident">m</span>.<span class="ident">into_iter</span>().<span class="ident">zip</span>(<span class="kw-2">&</span><span class="ident">v</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">a</span>, <span class="ident">b</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">i</span>, <span class="ident">v</span>.<span class="ident">len</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">drain_filter_test</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span>: <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">m</span>.<span class="ident">extend</span>(<span class="kw-2">&</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="ident">deleted</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">drain_filter</span>(<span class="op">|</span><span class="ident">v</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">v</span> <span class="op"><</span> <span class="number">4</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">>></span>();
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">deleted</span>, <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</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="kw">_</span><span class="op">>></span>(), <span class="kw-2">&</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">drain_to_empty_test</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">m</span>: <span class="ident">LinkedList</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="ident">LinkedList</span>::<span class="ident">new</span>();
<span class="ident">m</span>.<span class="ident">extend</span>(<span class="kw-2">&</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="ident">deleted</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">drain_filter</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="bool-val">true</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="kw">_</span><span class="op">>></span>();
<span class="ident">check_links</span>(<span class="kw-2">&</span><span class="ident">m</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">deleted</span>, <span class="kw-2">&</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="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">m</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="kw">_</span><span class="op">>></span>(), <span class="kw-2">&</span>[]);
}
}
</pre></div>
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