|
|
|
|
|
<!DOCTYPE HTML>
|
|
|
|
|
|
<html lang="zh-CN" class="light" dir="ltr">
|
|
|
|
|
|
<head>
|
|
|
|
|
|
<!-- Book generated using mdBook -->
|
|
|
|
|
|
<meta charset="UTF-8">
|
|
|
|
|
|
<title>无聊的组合 - Rust语言圣经(Rust Course)</title>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Custom HTML head -->
|
|
|
|
|
|
|
|
|
|
|
|
<meta name="description" content="">
|
|
|
|
|
|
<meta name="viewport" content="width=device-width, initial-scale=1">
|
|
|
|
|
|
<meta name="theme-color" content="#ffffff">
|
|
|
|
|
|
|
|
|
|
|
|
<link rel="icon" href="../../favicon.svg">
|
|
|
|
|
|
<link rel="shortcut icon" href="../../favicon.png">
|
|
|
|
|
|
<link rel="stylesheet" href="../../css/variables.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../../css/general.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../../css/chrome.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../../css/print.css" media="print">
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Fonts -->
|
|
|
|
|
|
<link rel="stylesheet" href="../../FontAwesome/css/font-awesome.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../../fonts/fonts.css">
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Highlight.js Stylesheets -->
|
|
|
|
|
|
<link rel="stylesheet" href="../../highlight.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../../tomorrow-night.css">
|
|
|
|
|
|
<link rel="stylesheet" href="../../ayu-highlight.css">
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Custom theme stylesheets -->
|
|
|
|
|
|
<link rel="stylesheet" href="../../theme/style.css">
|
|
|
|
|
|
|
|
|
|
|
|
</head>
|
|
|
|
|
|
<body class="sidebar-visible no-js">
|
|
|
|
|
|
<div id="body-container">
|
|
|
|
|
|
<!-- Provide site root to javascript -->
|
|
|
|
|
|
<script>
|
|
|
|
|
|
var path_to_root = "../../";
|
|
|
|
|
|
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Work around some values being stored in localStorage wrapped in quotes -->
|
|
|
|
|
|
<script>
|
|
|
|
|
|
try {
|
|
|
|
|
|
var theme = localStorage.getItem('mdbook-theme');
|
|
|
|
|
|
var sidebar = localStorage.getItem('mdbook-sidebar');
|
|
|
|
|
|
|
|
|
|
|
|
if (theme.startsWith('"') && theme.endsWith('"')) {
|
|
|
|
|
|
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
|
|
|
|
|
|
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
|
|
|
|
|
|
}
|
|
|
|
|
|
} catch (e) { }
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Set the theme before any content is loaded, prevents flash -->
|
|
|
|
|
|
<script>
|
|
|
|
|
|
var theme;
|
|
|
|
|
|
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
|
|
|
|
|
|
if (theme === null || theme === undefined) { theme = default_theme; }
|
|
|
|
|
|
var html = document.querySelector('html');
|
|
|
|
|
|
html.classList.remove('light')
|
|
|
|
|
|
html.classList.add(theme);
|
|
|
|
|
|
var body = document.querySelector('body');
|
|
|
|
|
|
body.classList.remove('no-js')
|
|
|
|
|
|
body.classList.add('js');
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<input type="checkbox" id="sidebar-toggle-anchor" class="hidden">
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Hide / unhide sidebar before it is displayed -->
|
|
|
|
|
|
<script>
|
|
|
|
|
|
var body = document.querySelector('body');
|
|
|
|
|
|
var sidebar = null;
|
|
|
|
|
|
var sidebar_toggle = document.getElementById("sidebar-toggle-anchor");
|
|
|
|
|
|
if (document.body.clientWidth >= 1080) {
|
|
|
|
|
|
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
|
|
|
|
|
|
sidebar = sidebar || 'visible';
|
|
|
|
|
|
} else {
|
|
|
|
|
|
sidebar = 'hidden';
|
|
|
|
|
|
}
|
|
|
|
|
|
sidebar_toggle.checked = sidebar === 'visible';
|
|
|
|
|
|
body.classList.remove('sidebar-visible');
|
|
|
|
|
|
body.classList.add("sidebar-" + sidebar);
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
|
|
|
|
|
|
<div class="sidebar-scrollbox">
|
|
|
|
|
|
<ol class="chapter"><li class="chapter-item affix "><a href="../../about-book.html">关于本书</a></li><li class="chapter-item affix "><a href="../../into-rust.html">进入 Rust 编程世界</a></li><li class="chapter-item affix "><a href="../../first-try/sth-you-should-not-do.html">避免从入门到放弃</a></li><li class="chapter-item affix "><a href="../../community.html">社区和锈书</a></li><li class="spacer"></li><li class="chapter-item affix "><a href="../../some-thoughts.html">Xobserve: 一切皆可观测</a></li><li class="chapter-item affix "><a href="../../beat-ai.html">BeatAI: 工程师 AI 入门圣经</a></li><li class="chapter-item affix "><li class="part-title">Rust 语言基础学习</li><li class="spacer"></li><li class="chapter-item "><a href="../../first-try/intro.html"><strong aria-hidden="true">1.</strong> 寻找牛刀，以便小试</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="../../first-try/installation.html"><strong aria-hidden="true">1.1.</strong> 安装 Rust 环境</a></li><li class="chapter-item "><a href="../../first-try/editor.html"><strong aria-hidden="true">1.2.</strong> 墙推 VSCode!</a></li><li class="chapter-item "><a href="../../first-try/cargo.html"><strong aria-hidden="true">1.3.</strong> 认识 Cargo</a></li><li class="chapter-item "><a href="../../first-try/hello-world.html"><strong aria-hidden="true">1.4.</strong> 不仅仅是 Hello world</a></li><li class="chapter-item "><a href="../../first-try/slowly-downloading.html"><strong aria-hidden="true">1.5.</strong> 下载依赖太慢了？</a></li></ol></li><li class="chapter-item "><a href="../../basic/intro.html"><strong aria-hidden="true">2.</strong> Rust 基础入门</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="../../basic/variable.html"><strong aria-hidden="true">2.1.</strong> 变量绑定与解构</a></li><li class="chapter-item "><a href="../../basic/base-type/index.html"><strong aria-hidden="true">2.2.</strong> 基本类型</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="../../basic/base-type/numbers.html"><strong aria-hidden="true">2.2.1.</strong> 数值类型</a></li><li class="chapter-item "><a href="../../basic/base-type/char-bool.html"><strong aria-hidden="true">2.2.2.</strong> 字符、布尔、单元类型</a></li><li class="chapter-item "><a href="../../basic/base-type/statement-expression.html"><strong aria-hidden="true">2.2.3.</strong> 语句与表达式</a></li><li class="chapter-item "><a href="../../basic/base-type/function.html"><strong aria-hidden="true">2.2.4.</strong> 函数</a></li></ol></li><li class="chapter-item "><a href="../../basic/ownership/index.html"><strong aria-hidden="true">2.3.</strong> 所有权和借用</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="../../basic/ownership/ownership.html"><strong aria-hidden="true">2.3.1.</strong> 所有权</a></li><li class="chapter-item "><a href="../../basic/ownership/borrowing.html"><strong aria-hidden="true">2.3.2.</strong> 引用与借用</a></li></ol></li><li class="chapter-item "><a href="../../basic/compound-type/intro.html"><strong aria-hidden="true">2.4.</strong> 复合类型</a><a class="toggle"><div>❱</div></a></li><li><ol class="section"><li class="chapter-item "><a href="../../basic/compound-type/string-slice.html"><strong aria-hidden="true">2.4.1.</strong> 字符串与切片</a></li><li class="chapter-item "><a href="../../basic/compound-type/tuple.html"><strong aria-hidden="true">2.4.2.</strong> 元组</a></li><li class="chapter-item "><a href="../../basic/compound-type/struct.html"><strong aria-hidden="true">2.4.3.</strong> 结构体</a></li><li class="chapter-item "><a href="../../basic/compound-type/enum.html"><strong aria-hidden="true">2.4.4.</strong> 枚举</a></li><li class="chapter-item "><a href="../../basic/compound-type/array.html"><strong aria-hidden="true">2.4.5.</strong> 数组</a></l
|
|
|
|
|
|
</div>
|
|
|
|
|
|
<div id="sidebar-resize-handle" class="sidebar-resize-handle">
|
|
|
|
|
|
<div class="sidebar-resize-indicator"></div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</nav>
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Track and set sidebar scroll position -->
|
|
|
|
|
|
<script>
|
|
|
|
|
|
var sidebarScrollbox = document.querySelector('#sidebar .sidebar-scrollbox');
|
|
|
|
|
|
sidebarScrollbox.addEventListener('click', function(e) {
|
|
|
|
|
|
if (e.target.tagName === 'A') {
|
|
|
|
|
|
sessionStorage.setItem('sidebar-scroll', sidebarScrollbox.scrollTop);
|
|
|
|
|
|
}
|
|
|
|
|
|
}, { passive: true });
|
|
|
|
|
|
var sidebarScrollTop = sessionStorage.getItem('sidebar-scroll');
|
|
|
|
|
|
sessionStorage.removeItem('sidebar-scroll');
|
|
|
|
|
|
if (sidebarScrollTop) {
|
|
|
|
|
|
// preserve sidebar scroll position when navigating via links within sidebar
|
|
|
|
|
|
sidebarScrollbox.scrollTop = sidebarScrollTop;
|
|
|
|
|
|
} else {
|
|
|
|
|
|
// scroll sidebar to current active section when navigating via "next/previous chapter" buttons
|
|
|
|
|
|
var activeSection = document.querySelector('#sidebar .active');
|
|
|
|
|
|
if (activeSection) {
|
|
|
|
|
|
activeSection.scrollIntoView({ block: 'center' });
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<div id="page-wrapper" class="page-wrapper">
|
|
|
|
|
|
|
|
|
|
|
|
<div class="page">
|
|
|
|
|
|
<div id="menu-bar-hover-placeholder"></div>
|
|
|
|
|
|
<div id="menu-bar" class="menu-bar sticky">
|
|
|
|
|
|
<div class="left-buttons">
|
|
|
|
|
|
<label id="sidebar-toggle" class="icon-button" for="sidebar-toggle-anchor" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
|
|
|
|
|
|
<i class="fa fa-bars"></i>
|
|
|
|
|
|
</label>
|
|
|
|
|
|
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
|
|
|
|
|
|
<i class="fa fa-paint-brush"></i>
|
|
|
|
|
|
</button>
|
|
|
|
|
|
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
|
|
|
|
|
|
<li role="none"><button role="menuitem" class="theme" id="light">Light</button></li>
|
|
|
|
|
|
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
|
|
|
|
|
|
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
|
|
|
|
|
|
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
|
|
|
|
|
|
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
|
|
|
|
|
|
<i class="fa fa-search"></i>
|
|
|
|
|
|
</button>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<h1 class="menu-title">Rust语言圣经(Rust Course)</h1>
|
|
|
|
|
|
|
|
|
|
|
|
<div class="right-buttons">
|
|
|
|
|
|
<a href="../../print.html" title="Print this book" aria-label="Print this book">
|
|
|
|
|
|
<i id="print-button" class="fa fa-print"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
<a href="https://github.com/sunface/rust-course" title="Git repository" aria-label="Git repository">
|
|
|
|
|
|
<i id="git-repository-button" class="fa fa-github"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
<a href="https://github.com/sunface/rust-course/edit/main/src/too-many-lists/production-unsafe-deque/boring-combinatorics.md" title="Suggest an edit" aria-label="Suggest an edit">
|
|
|
|
|
|
<i id="git-edit-button" class="fa fa-edit"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<div id="search-wrapper" class="hidden">
|
|
|
|
|
|
<form id="searchbar-outer" class="searchbar-outer">
|
|
|
|
|
|
<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
|
|
|
|
|
|
</form>
|
|
|
|
|
|
<div id="searchresults-outer" class="searchresults-outer hidden">
|
|
|
|
|
|
<div id="searchresults-header" class="searchresults-header"></div>
|
|
|
|
|
|
<ul id="searchresults">
|
|
|
|
|
|
</ul>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
|
|
|
|
|
|
<script>
|
|
|
|
|
|
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
|
|
|
|
|
|
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
|
|
|
|
|
|
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
|
|
|
|
|
|
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
|
|
|
|
|
|
});
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<div id="content" class="content">
|
|
|
|
|
|
<!-- Page table of contents -->
|
|
|
|
|
|
<div class="sidetoc"><nav class="pagetoc"></nav></div>
|
|
|
|
|
|
<main>
|
|
|
|
|
|
<h1 id="boring-combinatorics"><a class="header" href="#boring-combinatorics">Boring Combinatorics</a></h1>
|
|
|
|
|
|
<p>好了，回到我们的常规链接列表！</p>
|
|
|
|
|
|
<p>首先，让我们来解决 <code>Drop</code> 的问题：</p>
|
|
|
|
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
|
|
|
</span><span class="boring">fn main() {
|
|
|
|
|
|
</span>impl<T> Drop for LinkedList<T> {
|
|
|
|
|
|
fn drop(&mut self) {
|
|
|
|
|
|
// Pop until we have to stop
|
|
|
|
|
|
while let Some(_) = self.pop_front() { }
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
<span class="boring">}</span></code></pre></pre>
|
|
|
|
|
|
<p>我们必须填写一堆非常无聊的组合实现，如 front、front_mut、back、back_mut、iter、iter_mut、into_iter......</p>
|
|
|
|
|
|
<p>我已经精心设计了之前的 push/pop 实现，因此我们只需前后对调，代码就能做正确的事情！痛苦的经验万岁！(对于节点来说，使用 "prev和next "是很有诱惑力的，但我发现，为了避免错误，尽量使用 "front "和 "back"才是真正对的）。</p>
|
|
|
|
|
|
<p>首先是 <code>front</code>:</p>
|
|
|
|
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
|
|
|
</span><span class="boring">fn main() {
|
|
|
|
|
|
</span>pub fn front(&self) -> Option<&T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
self.front.map(|node| &(*node.as_ptr()).elem)
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
<span class="boring">}</span></code></pre></pre>
|
|
|
|
|
|
<p>接着是：</p>
|
|
|
|
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
|
|
|
</span><span class="boring">fn main() {
|
|
|
|
|
|
</span>pub fn front_mut(&mut self) -> Option<&mut T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
self.front.map(|node| &mut (*node.as_ptr()).elem)
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
<span class="boring">}</span></code></pre></pre>
|
|
|
|
|
|
<p>我会把所有的 <code>back</code> 版本放到文章最终的代码中。</p>
|
|
|
|
|
|
<p>接下来是迭代器。与之前的所有列表不同，我们终于解锁了双端迭代器（<a href="https://doc.rust-lang.org/std/iter/trait.DoubleEndedIterator.html">DoubleEndedIterator</a>）的功能，而且如果要达到生产质量，我们还要支持精确大小迭代器（ <a href="https://doc.rust-lang.org/std/iter/trait.ExactSizeIterator.html">ExactSizeIterator</a>）。</p>
|
|
|
|
|
|
<p>因此，除了 <code>next</code> 和 <code>size_hint</code>，我们还将支持 <code>next_back</code> 和 <code>len</code>。</p>
|
|
|
|
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
|
|
|
</span><span class="boring">fn main() {
|
|
|
|
|
|
</span>pub struct Iter<'a, T> {
|
|
|
|
|
|
front: Link<T>,
|
|
|
|
|
|
back: Link<T>,
|
|
|
|
|
|
len: usize,
|
|
|
|
|
|
_boo: PhantomData<&'a T>,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> LinkedList<T> {
|
|
|
|
|
|
pub fn iter(&self) -> Iter<T> {
|
|
|
|
|
|
Iter {
|
|
|
|
|
|
front: self.front,
|
|
|
|
|
|
back: self.back,
|
|
|
|
|
|
len: self.len,
|
|
|
|
|
|
_boo: PhantomData,
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> IntoIterator for &'a LinkedList<T> {
|
|
|
|
|
|
type IntoIter = Iter<'a, T>;
|
|
|
|
|
|
type Item = &'a T;
|
|
|
|
|
|
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
|
|
|
self.iter()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> Iterator for Iter<'a, T> {
|
|
|
|
|
|
type Item = &'a T;
|
|
|
|
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
// While self.front == self.back is a tempting condition to check here,
|
|
|
|
|
|
// it won't do the right for yielding the last element! That sort of
|
|
|
|
|
|
// thing only works for arrays because of "one-past-the-end" pointers.
|
|
|
|
|
|
if self.len > 0 {
|
|
|
|
|
|
// We could unwrap front, but this is safer and easier
|
|
|
|
|
|
self.front.map(|node| unsafe {
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
self.front = (*node.as_ptr()).back;
|
|
|
|
|
|
&(*node.as_ptr()).elem
|
|
|
|
|
|
})
|
|
|
|
|
|
} else {
|
|
|
|
|
|
None
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
|
|
|
(self.len, Some(self.len))
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
|
|
|
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
if self.len > 0 {
|
|
|
|
|
|
self.back.map(|node| unsafe {
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
self.back = (*node.as_ptr()).front;
|
|
|
|
|
|
&(*node.as_ptr()).elem
|
|
|
|
|
|
})
|
|
|
|
|
|
} else {
|
|
|
|
|
|
None
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> ExactSizeIterator for Iter<'a, T> {
|
|
|
|
|
|
fn len(&self) -> usize {
|
|
|
|
|
|
self.len
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
<span class="boring">}</span></code></pre></pre>
|
|
|
|
|
|
<p>...这只是 <code>.iter()</code>...</p>
|
|
|
|
|
|
<p>我们将在最后粘贴 IterMut，它在很多地方与 <code>mut</code> 的代码完全相同，让我们先敲掉 <code>into_iter</code>。我们仍然可以使用我们屡试不爽的解决方案，即让它包裹我们的集合，并在下一步中使用 <code>pop</code>：</p>
|
|
|
|
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
|
|
|
</span><span class="boring">fn main() {
|
|
|
|
|
|
</span>pub struct IntoIter<T> {
|
|
|
|
|
|
list: LinkedList<T>,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> LinkedList<T> {
|
|
|
|
|
|
pub fn into_iter(self) -> IntoIter<T> {
|
|
|
|
|
|
IntoIter {
|
|
|
|
|
|
list: self
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> IntoIterator for LinkedList<T> {
|
|
|
|
|
|
type IntoIter = IntoIter<T>;
|
|
|
|
|
|
type Item = T;
|
|
|
|
|
|
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
|
|
|
self.into_iter()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> Iterator for IntoIter<T> {
|
|
|
|
|
|
type Item = T;
|
|
|
|
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
self.list.pop_front()
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
|
|
|
(self.list.len, Some(self.list.len))
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> DoubleEndedIterator for IntoIter<T> {
|
|
|
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
self.list.pop_back()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> ExactSizeIterator for IntoIter<T> {
|
|
|
|
|
|
fn len(&self) -> usize {
|
|
|
|
|
|
self.list.len
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
<span class="boring">}</span></code></pre></pre>
|
|
|
|
|
|
<p>仍然是一大堆模板，但至少是令人满意的模板。</p>
|
|
|
|
|
|
<p>好了，这是我们所有的代码，其中包含了所有的组合：</p>
|
|
|
|
|
|
<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">#![allow(unused)]
|
|
|
|
|
|
</span><span class="boring">fn main() {
|
|
|
|
|
|
</span>use std::ptr::NonNull;
|
|
|
|
|
|
use std::marker::PhantomData;
|
|
|
|
|
|
|
|
|
|
|
|
pub struct LinkedList<T> {
|
|
|
|
|
|
front: Link<T>,
|
|
|
|
|
|
back: Link<T>,
|
|
|
|
|
|
len: usize,
|
|
|
|
|
|
_boo: PhantomData<T>,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
type Link<T> = Option<NonNull<Node<T>>>;
|
|
|
|
|
|
|
|
|
|
|
|
struct Node<T> {
|
|
|
|
|
|
front: Link<T>,
|
|
|
|
|
|
back: Link<T>,
|
|
|
|
|
|
elem: T,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub struct Iter<'a, T> {
|
|
|
|
|
|
front: Link<T>,
|
|
|
|
|
|
back: Link<T>,
|
|
|
|
|
|
len: usize,
|
|
|
|
|
|
_boo: PhantomData<&'a T>,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub struct IterMut<'a, T> {
|
|
|
|
|
|
front: Link<T>,
|
|
|
|
|
|
back: Link<T>,
|
|
|
|
|
|
len: usize,
|
|
|
|
|
|
_boo: PhantomData<&'a mut T>,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub struct IntoIter<T> {
|
|
|
|
|
|
list: LinkedList<T>,
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> LinkedList<T> {
|
|
|
|
|
|
pub fn new() -> Self {
|
|
|
|
|
|
Self {
|
|
|
|
|
|
front: None,
|
|
|
|
|
|
back: None,
|
|
|
|
|
|
len: 0,
|
|
|
|
|
|
_boo: PhantomData,
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn push_front(&mut self, elem: T) {
|
|
|
|
|
|
// SAFETY: it's a linked-list, what do you want?
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
let new = NonNull::new_unchecked(Box::into_raw(Box::new(Node {
|
|
|
|
|
|
front: None,
|
|
|
|
|
|
back: None,
|
|
|
|
|
|
elem,
|
|
|
|
|
|
})));
|
|
|
|
|
|
if let Some(old) = self.front {
|
|
|
|
|
|
// Put the new front before the old one
|
|
|
|
|
|
(*old.as_ptr()).front = Some(new);
|
|
|
|
|
|
(*new.as_ptr()).back = Some(old);
|
|
|
|
|
|
} else {
|
|
|
|
|
|
// If there's no front, then we're the empty list and need
|
|
|
|
|
|
// to set the back too.
|
|
|
|
|
|
self.back = Some(new);
|
|
|
|
|
|
}
|
|
|
|
|
|
// These things always happen!
|
|
|
|
|
|
self.front = Some(new);
|
|
|
|
|
|
self.len += 1;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn push_back(&mut self, elem: T) {
|
|
|
|
|
|
// SAFETY: it's a linked-list, what do you want?
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
let new = NonNull::new_unchecked(Box::into_raw(Box::new(Node {
|
|
|
|
|
|
back: None,
|
|
|
|
|
|
front: None,
|
|
|
|
|
|
elem,
|
|
|
|
|
|
})));
|
|
|
|
|
|
if let Some(old) = self.back {
|
|
|
|
|
|
// Put the new back before the old one
|
|
|
|
|
|
(*old.as_ptr()).back = Some(new);
|
|
|
|
|
|
(*new.as_ptr()).front = Some(old);
|
|
|
|
|
|
} else {
|
|
|
|
|
|
// If there's no back, then we're the empty list and need
|
|
|
|
|
|
// to set the front too.
|
|
|
|
|
|
self.front = Some(new);
|
|
|
|
|
|
}
|
|
|
|
|
|
// These things always happen!
|
|
|
|
|
|
self.back = Some(new);
|
|
|
|
|
|
self.len += 1;
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn pop_front(&mut self) -> Option<T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
// Only have to do stuff if there is a front node to pop.
|
|
|
|
|
|
self.front.map(|node| {
|
|
|
|
|
|
// Bring the Box back to life so we can move out its value and
|
|
|
|
|
|
// Drop it (Box continues to magically understand this for us).
|
|
|
|
|
|
let boxed_node = Box::from_raw(node.as_ptr());
|
|
|
|
|
|
let result = boxed_node.elem;
|
|
|
|
|
|
|
|
|
|
|
|
// Make the next node into the new front.
|
|
|
|
|
|
self.front = boxed_node.back;
|
|
|
|
|
|
if let Some(new) = self.front {
|
|
|
|
|
|
// Cleanup its reference to the removed node
|
|
|
|
|
|
(*new.as_ptr()).front = None;
|
|
|
|
|
|
} else {
|
|
|
|
|
|
// If the front is now null, then this list is now empty!
|
|
|
|
|
|
self.back = None;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
result
|
|
|
|
|
|
// Box gets implicitly freed here, knows there is no T.
|
|
|
|
|
|
})
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn pop_back(&mut self) -> Option<T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
// Only have to do stuff if there is a back node to pop.
|
|
|
|
|
|
self.back.map(|node| {
|
|
|
|
|
|
// Bring the Box front to life so we can move out its value and
|
|
|
|
|
|
// Drop it (Box continues to magically understand this for us).
|
|
|
|
|
|
let boxed_node = Box::from_raw(node.as_ptr());
|
|
|
|
|
|
let result = boxed_node.elem;
|
|
|
|
|
|
|
|
|
|
|
|
// Make the next node into the new back.
|
|
|
|
|
|
self.back = boxed_node.front;
|
|
|
|
|
|
if let Some(new) = self.back {
|
|
|
|
|
|
// Cleanup its reference to the removed node
|
|
|
|
|
|
(*new.as_ptr()).back = None;
|
|
|
|
|
|
} else {
|
|
|
|
|
|
// If the back is now null, then this list is now empty!
|
|
|
|
|
|
self.front = None;
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
result
|
|
|
|
|
|
// Box gets implicitly freed here, knows there is no T.
|
|
|
|
|
|
})
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn front(&self) -> Option<&T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
self.front.map(|node| &(*node.as_ptr()).elem)
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn front_mut(&mut self) -> Option<&mut T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
self.front.map(|node| &mut (*node.as_ptr()).elem)
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn back(&self) -> Option<&T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
self.back.map(|node| &(*node.as_ptr()).elem)
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn back_mut(&mut self) -> Option<&mut T> {
|
|
|
|
|
|
unsafe {
|
|
|
|
|
|
self.back.map(|node| &mut (*node.as_ptr()).elem)
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn len(&self) -> usize {
|
|
|
|
|
|
self.len
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn iter(&self) -> Iter<T> {
|
|
|
|
|
|
Iter {
|
|
|
|
|
|
front: self.front,
|
|
|
|
|
|
back: self.back,
|
|
|
|
|
|
len: self.len,
|
|
|
|
|
|
_boo: PhantomData,
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn iter_mut(&mut self) -> IterMut<T> {
|
|
|
|
|
|
IterMut {
|
|
|
|
|
|
front: self.front,
|
|
|
|
|
|
back: self.back,
|
|
|
|
|
|
len: self.len,
|
|
|
|
|
|
_boo: PhantomData,
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
pub fn into_iter(self) -> IntoIter<T> {
|
|
|
|
|
|
IntoIter {
|
|
|
|
|
|
list: self
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> Drop for LinkedList<T> {
|
|
|
|
|
|
fn drop(&mut self) {
|
|
|
|
|
|
// Pop until we have to stop
|
|
|
|
|
|
while let Some(_) = self.pop_front() { }
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> IntoIterator for &'a LinkedList<T> {
|
|
|
|
|
|
type IntoIter = Iter<'a, T>;
|
|
|
|
|
|
type Item = &'a T;
|
|
|
|
|
|
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
|
|
|
self.iter()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> Iterator for Iter<'a, T> {
|
|
|
|
|
|
type Item = &'a T;
|
|
|
|
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
// While self.front == self.back is a tempting condition to check here,
|
|
|
|
|
|
// it won't do the right for yielding the last element! That sort of
|
|
|
|
|
|
// thing only works for arrays because of "one-past-the-end" pointers.
|
|
|
|
|
|
if self.len > 0 {
|
|
|
|
|
|
// We could unwrap front, but this is safer and easier
|
|
|
|
|
|
self.front.map(|node| unsafe {
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
self.front = (*node.as_ptr()).back;
|
|
|
|
|
|
&(*node.as_ptr()).elem
|
|
|
|
|
|
})
|
|
|
|
|
|
} else {
|
|
|
|
|
|
None
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
|
|
|
(self.len, Some(self.len))
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
|
|
|
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
if self.len > 0 {
|
|
|
|
|
|
self.back.map(|node| unsafe {
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
self.back = (*node.as_ptr()).front;
|
|
|
|
|
|
&(*node.as_ptr()).elem
|
|
|
|
|
|
})
|
|
|
|
|
|
} else {
|
|
|
|
|
|
None
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> ExactSizeIterator for Iter<'a, T> {
|
|
|
|
|
|
fn len(&self) -> usize {
|
|
|
|
|
|
self.len
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> IntoIterator for &'a mut LinkedList<T> {
|
|
|
|
|
|
type IntoIter = IterMut<'a, T>;
|
|
|
|
|
|
type Item = &'a mut T;
|
|
|
|
|
|
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
|
|
|
self.iter_mut()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> Iterator for IterMut<'a, T> {
|
|
|
|
|
|
type Item = &'a mut T;
|
|
|
|
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
// While self.front == self.back is a tempting condition to check here,
|
|
|
|
|
|
// it won't do the right for yielding the last element! That sort of
|
|
|
|
|
|
// thing only works for arrays because of "one-past-the-end" pointers.
|
|
|
|
|
|
if self.len > 0 {
|
|
|
|
|
|
// We could unwrap front, but this is safer and easier
|
|
|
|
|
|
self.front.map(|node| unsafe {
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
self.front = (*node.as_ptr()).back;
|
|
|
|
|
|
&mut (*node.as_ptr()).elem
|
|
|
|
|
|
})
|
|
|
|
|
|
} else {
|
|
|
|
|
|
None
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
|
|
|
(self.len, Some(self.len))
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> DoubleEndedIterator for IterMut<'a, T> {
|
|
|
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
if self.len > 0 {
|
|
|
|
|
|
self.back.map(|node| unsafe {
|
|
|
|
|
|
self.len -= 1;
|
|
|
|
|
|
self.back = (*node.as_ptr()).front;
|
|
|
|
|
|
&mut (*node.as_ptr()).elem
|
|
|
|
|
|
})
|
|
|
|
|
|
} else {
|
|
|
|
|
|
None
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<'a, T> ExactSizeIterator for IterMut<'a, T> {
|
|
|
|
|
|
fn len(&self) -> usize {
|
|
|
|
|
|
self.len
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> IntoIterator for LinkedList<T> {
|
|
|
|
|
|
type IntoIter = IntoIter<T>;
|
|
|
|
|
|
type Item = T;
|
|
|
|
|
|
|
|
|
|
|
|
fn into_iter(self) -> Self::IntoIter {
|
|
|
|
|
|
self.into_iter()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> Iterator for IntoIter<T> {
|
|
|
|
|
|
type Item = T;
|
|
|
|
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
self.list.pop_front()
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
fn size_hint(&self) -> (usize, Option<usize>) {
|
|
|
|
|
|
(self.list.len, Some(self.list.len))
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> DoubleEndedIterator for IntoIter<T> {
|
|
|
|
|
|
fn next_back(&mut self) -> Option<Self::Item> {
|
|
|
|
|
|
self.list.pop_back()
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
impl<T> ExactSizeIterator for IntoIter<T> {
|
|
|
|
|
|
fn len(&self) -> usize {
|
|
|
|
|
|
self.list.len
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
|
|
mod test {
|
|
|
|
|
|
use super::LinkedList;
|
|
|
|
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
|
|
fn test_basic_front() {
|
|
|
|
|
|
let mut list = LinkedList::new();
|
|
|
|
|
|
|
|
|
|
|
|
// Try to break an empty list
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
|
|
|
|
|
|
// Try to break a one item list
|
|
|
|
|
|
list.push_front(10);
|
|
|
|
|
|
assert_eq!(list.len(), 1);
|
|
|
|
|
|
assert_eq!(list.pop_front(), Some(10));
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
|
|
|
|
|
|
// Mess around
|
|
|
|
|
|
list.push_front(10);
|
|
|
|
|
|
assert_eq!(list.len(), 1);
|
|
|
|
|
|
list.push_front(20);
|
|
|
|
|
|
assert_eq!(list.len(), 2);
|
|
|
|
|
|
list.push_front(30);
|
|
|
|
|
|
assert_eq!(list.len(), 3);
|
|
|
|
|
|
assert_eq!(list.pop_front(), Some(30));
|
|
|
|
|
|
assert_eq!(list.len(), 2);
|
|
|
|
|
|
list.push_front(40);
|
|
|
|
|
|
assert_eq!(list.len(), 3);
|
|
|
|
|
|
assert_eq!(list.pop_front(), Some(40));
|
|
|
|
|
|
assert_eq!(list.len(), 2);
|
|
|
|
|
|
assert_eq!(list.pop_front(), Some(20));
|
|
|
|
|
|
assert_eq!(list.len(), 1);
|
|
|
|
|
|
assert_eq!(list.pop_front(), Some(10));
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
assert_eq!(list.pop_front(), None);
|
|
|
|
|
|
assert_eq!(list.len(), 0);
|
|
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
<span class="boring">}</span></code></pre></pre>
|
|
|
|
|
|
|
|
|
|
|
|
<div id="giscus-container"></div>
|
|
|
|
|
|
</main>
|
|
|
|
|
|
|
|
|
|
|
|
<nav class="nav-wrapper" aria-label="Page navigation">
|
|
|
|
|
|
<!-- Mobile navigation buttons -->
|
|
|
|
|
|
<a rel="prev" href="../../too-many-lists/production-unsafe-deque/drop-and-panic-safety.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
|
|
|
|
|
<i class="fa fa-angle-left"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
|
|
|
|
<a rel="next prefetch" href="../../too-many-lists/production-unsafe-deque/filling-in-random-bits.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
|
|
|
|
|
<i class="fa fa-angle-right"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
|
|
|
|
<div style="clear: both"></div>
|
|
|
|
|
|
</nav>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
<nav class="nav-wide-wrapper" aria-label="Page navigation">
|
|
|
|
|
|
<a rel="prev" href="../../too-many-lists/production-unsafe-deque/drop-and-panic-safety.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
|
|
|
|
|
|
<i class="fa fa-angle-left"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
|
|
|
|
|
|
<a rel="next prefetch" href="../../too-many-lists/production-unsafe-deque/filling-in-random-bits.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
|
|
|
|
|
|
<i class="fa fa-angle-right"></i>
|
|
|
|
|
|
</a>
|
|
|
|
|
|
</nav>
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<script>
|
|
|
|
|
|
window.playground_copyable = true;
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
<script src="../../ace.js"></script>
|
|
|
|
|
|
<script src="../../editor.js"></script>
|
|
|
|
|
|
<script src="../../mode-rust.js"></script>
|
|
|
|
|
|
<script src="../../theme-dawn.js"></script>
|
|
|
|
|
|
<script src="../../theme-tomorrow_night.js"></script>
|
|
|
|
|
|
|
|
|
|
|
|
<script src="../../elasticlunr.min.js"></script>
|
|
|
|
|
|
<script src="../../mark.min.js"></script>
|
|
|
|
|
|
<script src="../../searcher.js"></script>
|
|
|
|
|
|
|
|
|
|
|
|
<script src="../../clipboard.min.js"></script>
|
|
|
|
|
|
<script src="../../highlight.js"></script>
|
|
|
|
|
|
<script src="../../book.js"></script>
|
|
|
|
|
|
|
|
|
|
|
|
<script type="text/javascript" charset="utf-8">
|
|
|
|
|
|
var pagePath = "too-many-lists/production-unsafe-deque/boring-combinatorics.md"
|
|
|
|
|
|
</script>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!-- Custom JS scripts -->
|
|
|
|
|
|
<script src="../../assets/custom.js"></script>
|
|
|
|
|
|
<script src="../../assets/bigPicture.js"></script>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
</div>
|
|
|
|
|
|
</body>
|
|
|
|
|
|
</html>
|
