<!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 `abstutil/src/collections.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>collections.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.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">&#9776;</div><a href='../../abstutil/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled 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="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1">  1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">itertools</span>::<span class="ident">Itertools</span>;
<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>::<span class="ident">Ord</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::{<span class="ident">BTreeMap</span>, <span class="ident">BTreeSet</span>};

<span class="comment">// TODO Ideally derive Serialize and Deserialize, but I can&#39;t seem to express the lifetimes</span>
<span class="comment">// correctly.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MultiMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">K</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>,
    <span class="ident">V</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>,
{
    <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span><span class="op">&gt;</span>,
    <span class="ident">empty</span>: <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span> <span class="ident">MultiMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>
<span class="kw">where</span>
    <span class="ident">K</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>,
    <span class="ident">V</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span>,
{
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">MultiMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span> {
        <span class="ident">MultiMap</span> {
            <span class="ident">map</span>: <span class="ident">BTreeMap</span>::<span class="ident">new</span>(),
            <span class="ident">empty</span>: <span class="ident">BTreeSet</span>::<span class="ident">new</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">value</span>: <span class="ident">V</span>) {
        <span class="self">self</span>.<span class="ident">map</span>
            .<span class="ident">entry</span>(<span class="ident">key</span>)
            .<span class="ident">or_insert_with</span>(<span class="ident">BTreeSet</span>::<span class="ident">new</span>)
            .<span class="ident">insert</span>(<span class="ident">value</span>);
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">value</span>: <span class="ident">V</span>) {
        <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">map</span>.<span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>) {
            <span class="kw">return</span>;
        }
        <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get_mut</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>).<span class="ident">unwrap</span>().<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">value</span>);
        <span class="kw">if</span> <span class="self">self</span>.<span class="ident">map</span>[<span class="kw-2">&amp;</span><span class="ident">key</span>].<span class="ident">is_empty</span>() {
            <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>);
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">key</span>).<span class="ident">unwrap_or</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">empty</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">len</span>()
    }

    <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">raw_map</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">consume</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">V</span><span class="op">&gt;</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">map</span>
    }
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">&gt;</span> {
    <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">usize</span><span class="op">&gt;</span>,
    <span class="ident">sum</span>: <span class="ident">usize</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">&gt;</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">Counter</span>::<span class="ident">new</span>()
    }
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">PartialEq</span> <span class="op">+</span> <span class="ident">Clone</span><span class="op">&gt;</span> <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span> {
        <span class="ident">Counter</span> {
            <span class="ident">map</span>: <span class="ident">BTreeMap</span>::<span class="ident">new</span>(),
            <span class="ident">sum</span>: <span class="number">0</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">add</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">val</span>: <span class="ident">T</span>, <span class="ident">amount</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="kw">let</span> <span class="ident">entry</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">entry</span>(<span class="ident">val</span>).<span class="ident">or_insert</span>(<span class="number">0</span>);
        <span class="kw-2">*</span><span class="ident">entry</span> <span class="op">+</span><span class="op">=</span> <span class="ident">amount</span>;
        <span class="self">self</span>.<span class="ident">sum</span> <span class="op">+</span><span class="op">=</span> <span class="ident">amount</span>;
        <span class="kw-2">*</span><span class="ident">entry</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">inc</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">val</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">add</span>(<span class="ident">val</span>, <span class="number">1</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">val</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="ident">val</span>).<span class="ident">cloned</span>().<span class="ident">unwrap_or</span>(<span class="number">0</span>)
    }

    <span class="comment">// Values with the same count are grouped together</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sorted_asc</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span><span class="op">&gt;</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">map</span>.<span class="ident">iter</span>().<span class="ident">collect</span>::<span class="op">&lt;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="kw">_</span><span class="op">&gt;</span><span class="op">&gt;</span>();
        <span class="ident">list</span>.<span class="ident">sort_by_key</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">cnt</span>)<span class="op">|</span> <span class="kw-2">*</span><span class="ident">cnt</span>);
        <span class="ident">list</span>.<span class="ident">into_iter</span>()
            .<span class="ident">group_by</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">cnt</span>)<span class="op">|</span> <span class="kw-2">*</span><span class="ident">cnt</span>)
            .<span class="ident">into_iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span>(<span class="kw">_</span>, <span class="ident">group</span>)<span class="op">|</span> <span class="ident">group</span>.<span class="ident">into_iter</span>().<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">val</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">val</span>.<span class="ident">clone</span>()).<span class="ident">collect</span>())
            .<span class="ident">collect</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">map</span>.<span class="ident">values</span>().<span class="ident">max</span>().<span class="ident">unwrap</span>()
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sum</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">sum</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">compare</span>(<span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">other</span>: <span class="ident">Counter</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">T</span>, <span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="kw">for</span> <span class="ident">key</span> <span class="kw">in</span> <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">keys</span>() {
            <span class="ident">other</span>.<span class="ident">map</span>.<span class="ident">entry</span>(<span class="ident">key</span>.<span class="ident">clone</span>()).<span class="ident">or_insert</span>(<span class="number">0</span>);
        }
        <span class="kw">for</span> <span class="ident">key</span> <span class="kw">in</span> <span class="ident">other</span>.<span class="ident">map</span>.<span class="ident">keys</span>() {
            <span class="self">self</span>.<span class="ident">map</span>.<span class="ident">entry</span>(<span class="ident">key</span>.<span class="ident">clone</span>()).<span class="ident">or_insert</span>(<span class="number">0</span>);
        }
        <span class="self">self</span>.<span class="ident">map</span>
            .<span class="ident">into_iter</span>()
            .<span class="ident">map</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="ident">cnt</span>)<span class="op">|</span> (<span class="ident">k</span>.<span class="ident">clone</span>(), <span class="ident">cnt</span>, <span class="ident">other</span>.<span class="ident">map</span>[<span class="kw-2">&amp;</span><span class="ident">k</span>]))
            .<span class="ident">collect</span>()
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">borrow</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">map</span>
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">consume</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">T</span>, <span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">map</span>
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wraparound_get</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>(<span class="ident">vec</span>: <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>, <span class="ident">idx</span>: <span class="ident">isize</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">T</span> {
    <span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">vec</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">isize</span>;
    <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="ident">idx</span> <span class="op">%</span> <span class="ident">len</span>;
    <span class="kw">let</span> <span class="ident">idx</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">idx</span> <span class="op">&gt;</span><span class="op">=</span> <span class="number">0</span> { <span class="ident">idx</span> } <span class="kw">else</span> { <span class="ident">idx</span> <span class="op">+</span> <span class="ident">len</span> };
    <span class="kw-2">&amp;</span><span class="ident">vec</span>[<span class="ident">idx</span> <span class="kw">as</span> <span class="ident">usize</span>]
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">retain_btreemap</span><span class="op">&lt;</span><span class="ident">K</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">V</span>, <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="kw-2">&amp;</span><span class="ident">K</span>, <span class="kw-2">&amp;</span><span class="ident">V</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span><span class="op">&gt;</span>(
    <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span>,
    <span class="ident">keep</span>: <span class="ident">F</span>,
) {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">remove_keys</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="kw">in</span> <span class="ident">map</span>.<span class="ident">iter</span>() {
        <span class="kw">if</span> <span class="op">!</span><span class="ident">keep</span>(<span class="ident">k</span>, <span class="ident">v</span>) {
            <span class="ident">remove_keys</span>.<span class="ident">push</span>(<span class="ident">k</span>.<span class="ident">clone</span>());
        }
    }
    <span class="kw">for</span> <span class="ident">k</span> <span class="kw">in</span> <span class="ident">remove_keys</span> {
        <span class="ident">map</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">k</span>);
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">retain_btreeset</span><span class="op">&lt;</span><span class="ident">K</span>: <span class="ident">Ord</span> <span class="op">+</span> <span class="ident">Clone</span>, <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&amp;</span><span class="ident">K</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span><span class="op">&gt;</span>(<span class="ident">set</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">BTreeSet</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span>, <span class="kw-2">mut</span> <span class="ident">keep</span>: <span class="ident">F</span>) {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">remove</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">K</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">k</span> <span class="kw">in</span> <span class="ident">set</span>.<span class="ident">iter</span>() {
        <span class="kw">if</span> <span class="op">!</span><span class="ident">keep</span>(<span class="ident">k</span>) {
            <span class="ident">remove</span>.<span class="ident">push</span>(<span class="ident">k</span>.<span class="ident">clone</span>());
        }
    }
    <span class="kw">for</span> <span class="ident">k</span> <span class="kw">in</span> <span class="ident">remove</span> {
        <span class="ident">set</span>.<span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="ident">k</span>);
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains_duplicates</span><span class="op">&lt;</span><span class="ident">T</span>: <span class="ident">Ord</span><span class="op">&gt;</span>(<span class="ident">vec</span>: <span class="kw-2">&amp;</span><span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">T</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
    <span class="kw">for</span> <span class="ident">item</span> <span class="kw">in</span> <span class="ident">vec</span> {
        <span class="kw">if</span> <span class="ident">set</span>.<span class="ident">contains</span>(<span class="ident">item</span>) {
            <span class="kw">return</span> <span class="bool-val">true</span>;
        }
        <span class="ident">set</span>.<span class="ident">insert</span>(<span class="ident">item</span>);
    }
    <span class="bool-val">false</span>
}

<span class="comment">// Use when your key is just PartialEq, not Ord or Hash.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">VecMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span> {
    <span class="ident">inner</span>: <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">&gt;</span>,
}

<span class="kw">impl</span><span class="op">&lt;</span><span class="ident">K</span>: <span class="ident">Clone</span> <span class="op">+</span> <span class="ident">PartialEq</span>, <span class="ident">V</span><span class="op">&gt;</span> <span class="ident">VecMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">VecMap</span><span class="op">&lt;</span><span class="ident">K</span>, <span class="ident">V</span><span class="op">&gt;</span> {
        <span class="ident">VecMap</span> { <span class="ident">inner</span>: <span class="ident">Vec</span>::<span class="ident">new</span>() }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">consume</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Vec</span><span class="op">&lt;</span>(<span class="ident">K</span>, <span class="ident">V</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">inner</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">mut_or_insert</span><span class="op">&lt;</span><span class="ident">F</span>: <span class="ident">Fn</span>() <span class="op">-</span><span class="op">&gt;</span> <span class="ident">V</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">key</span>: <span class="ident">K</span>, <span class="ident">ctor</span>: <span class="ident">F</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">V</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">idx</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">iter</span>().<span class="ident">position</span>(<span class="op">|</span>(<span class="ident">k</span>, <span class="kw">_</span>)<span class="op">|</span> <span class="ident">key</span> <span class="op">=</span><span class="op">=</span> <span class="kw-2">*</span><span class="ident">k</span>) {
            <span class="kw">return</span> <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</span>[<span class="ident">idx</span>].<span class="number">1</span>;
        }
        <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">push</span>((<span class="ident">key</span>, <span class="ident">ctor</span>()));
        <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">last_mut</span>().<span class="ident">unwrap</span>().<span class="number">1</span>
    }
}

<span class="comment">// Convenience functions around a string-&gt;string map</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Tags</span>(<span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">String</span><span class="op">&gt;</span>);

<span class="kw">impl</span> <span class="ident">Tags</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">String</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">Tags</span> {
        <span class="ident">Tags</span>(<span class="ident">map</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">k</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>(<span class="ident">k</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">contains_key</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">k</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">contains_key</span>(<span class="ident">k</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">k</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">v</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>(<span class="ident">k</span>) <span class="op">=</span><span class="op">=</span> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>.<span class="ident">to_string</span>())
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_any</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">k</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">values</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="ident">bool</span> {
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">v</span>) <span class="op">=</span> <span class="self">self</span>.<span class="number">0</span>.<span class="ident">get</span>(<span class="ident">k</span>) {
            <span class="ident">values</span>.<span class="ident">contains</span>(<span class="kw-2">&amp;</span><span class="ident">v</span>.<span class="ident">as_ref</span>())
        } <span class="kw">else</span> {
            <span class="bool-val">false</span>
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span><span class="op">&lt;</span><span class="ident">K</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>, <span class="ident">V</span>: <span class="ident">Into</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">k</span>: <span class="ident">K</span>, <span class="ident">v</span>: <span class="ident">V</span>) {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">insert</span>(<span class="ident">k</span>.<span class="ident">into</span>(), <span class="ident">v</span>.<span class="ident">into</span>());
    }
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">k</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="number">0</span>.<span class="ident">remove</span>(<span class="ident">k</span>)
    }

    <span class="comment">// TODO Really just iter()</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">inner</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-</span><span class="op">&gt;</span> <span class="kw-2">&amp;</span><span class="ident">BTreeMap</span><span class="op">&lt;</span><span class="ident">String</span>, <span class="ident">String</span><span class="op">&gt;</span> {
        <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>
    }
}
</pre></div>
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