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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `collections` mod in crate `abstutil`."><meta name="keywords" content="rust, rustlang, rust-lang, collections"><title>abstutil::collections - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
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</a><h2 class="location"><a href="#">Module collections</a></h2><div class="sidebar-elems"><section><div class="block"><ul><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div></section><div id="sidebar-vars" data-name="collections" data-ty="mod" data-relpath="./"></div><script defer src="./sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../abstutil/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><div class="theme-picker hidden"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="22" height="22" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><div class="main-heading">
<h1 class="fqn"><span class="in-band">Module <a href="../index.html">abstutil</a>::<wbr><a class="mod" href="#">collections</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/abstutil/collections.rs.html#1-423">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2>
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Counter.html" title="abstutil::collections::Counter struct">Counter</a></div><div class="item-right docblock-short"><p>A counter per key</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.FixedMap.html" title="abstutil::collections::FixedMap struct">FixedMap</a></div><div class="item-right docblock-short"><p>A drop-in replacement for <code>BTreeMap</code>, where the keys have the property of being array indices.
Some values may be missing. Much more efficient at operations on individual objects, because
it just becomes a simple array lookup.</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.MultiMap.html" title="abstutil::collections::MultiMap struct">MultiMap</a></div><div class="item-right docblock-short"></div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Tags.html" title="abstutil::collections::Tags struct">Tags</a></div><div class="item-right docblock-short"><p>Convenience functions around a string-&gt;string map</p>
</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.VecMap.html" title="abstutil::collections::VecMap struct">VecMap</a></div><div class="item-right docblock-short"><p>Use when your key is just PartialEq, not Ord or Hash.</p>
</div></div></div><h2 id="traits" class="small-section-header"><a href="#traits">Traits</a></h2>
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="trait" href="trait.IndexableKey.html" title="abstutil::collections::IndexableKey trait">IndexableKey</a></div><div class="item-right docblock-short"><p>Use with <code>FixedMap</code>. From a particular key, extract a <code>usize</code>. These values should be
roughly contiguous; the space used by the <code>FixedMap</code> will be <code>O(n)</code> with respect to the largest
value returned here.</p>
</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2>
<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.contains_duplicates.html" title="abstutil::collections::contains_duplicates fn">contains_duplicates</a></div><div class="item-right docblock-short"></div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.wraparound_get.html" title="abstutil::collections::wraparound_get fn">wraparound_get</a></div><div class="item-right docblock-short"></div></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="abstutil" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.62.1 (e092d0b6b 2022-07-16)" ></div>
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