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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="Source to the Rust file `src/liballoc/collections/btree/search.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>search.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">&#9776;</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="kw">use</span> <span class="ident">core</span>::<span class="ident">borrow</span>::<span class="ident">Borrow</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="kw">super</span>::<span class="ident">node</span>::{<span class="ident">Handle</span>, <span class="ident">NodeRef</span>, <span class="ident">marker</span>, <span class="ident">ForceResult</span>::<span class="kw-2">*</span>};

<span class="kw">use</span> <span class="ident">SearchResult</span>::<span class="kw-2">*</span>;

<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">SearchResult</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">FoundType</span>, <span class="ident">GoDownType</span><span class="op">&gt;</span> {
    <span class="ident">Found</span>(<span class="ident">Handle</span><span class="op">&lt;</span><span class="ident">NodeRef</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">FoundType</span><span class="op">&gt;</span>, <span class="ident">marker</span>::<span class="ident">KV</span><span class="op">&gt;</span>),
    <span class="ident">GoDown</span>(<span class="ident">Handle</span><span class="op">&lt;</span><span class="ident">NodeRef</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">GoDownType</span><span class="op">&gt;</span>, <span class="ident">marker</span>::<span class="ident">Edge</span><span class="op">&gt;</span>)
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">search_tree</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="kw-2">mut</span> <span class="ident">node</span>: <span class="ident">NodeRef</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span><span class="op">&gt;</span>,
    <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">Q</span>
) <span class="op">-&gt;</span> <span class="ident">SearchResult</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">marker</span>::<span class="ident">LeafOrInternal</span>, <span class="ident">marker</span>::<span class="ident">Leaf</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">Q</span>: <span class="ident">Ord</span>, <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op">&lt;</span><span class="ident">Q</span><span class="op">&gt;</span> {

    <span class="kw">loop</span> {
        <span class="kw">match</span> <span class="ident">search_node</span>(<span class="ident">node</span>, <span class="ident">key</span>) {
            <span class="ident">Found</span>(<span class="ident">handle</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="ident">Found</span>(<span class="ident">handle</span>),
            <span class="ident">GoDown</span>(<span class="ident">handle</span>) <span class="op">=&gt;</span> <span class="kw">match</span> <span class="ident">handle</span>.<span class="ident">force</span>() {
                <span class="ident">Leaf</span>(<span class="ident">leaf</span>) <span class="op">=&gt;</span> <span class="kw">return</span> <span class="ident">GoDown</span>(<span class="ident">leaf</span>),
                <span class="ident">Internal</span>(<span class="ident">internal</span>) <span class="op">=&gt;</span> {
                    <span class="ident">node</span> <span class="op">=</span> <span class="ident">internal</span>.<span class="ident">descend</span>();
                    <span class="kw">continue</span>;
                }
            }
        }
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">search_node</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Type</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="ident">node</span>: <span class="ident">NodeRef</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Type</span><span class="op">&gt;</span>,
    <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">Q</span>
) <span class="op">-&gt;</span> <span class="ident">SearchResult</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Type</span>, <span class="ident">Type</span><span class="op">&gt;</span>
        <span class="kw">where</span> <span class="ident">Q</span>: <span class="ident">Ord</span>, <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op">&lt;</span><span class="ident">Q</span><span class="op">&gt;</span> {

    <span class="kw">match</span> <span class="ident">search_linear</span>(<span class="kw-2">&amp;</span><span class="ident">node</span>, <span class="ident">key</span>) {
        (<span class="ident">idx</span>, <span class="bool-val">true</span>) <span class="op">=&gt;</span> <span class="ident">Found</span>(
            <span class="ident">Handle</span>::<span class="ident">new_kv</span>(<span class="ident">node</span>, <span class="ident">idx</span>)
        ),
        (<span class="ident">idx</span>, <span class="bool-val">false</span>) <span class="op">=&gt;</span> <span class="ident">SearchResult</span>::<span class="ident">GoDown</span>(
            <span class="ident">Handle</span>::<span class="ident">new_edge</span>(<span class="ident">node</span>, <span class="ident">idx</span>)
        )
    }
}

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">search_linear</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Type</span>, <span class="ident">Q</span>: <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">&gt;</span>(
    <span class="ident">node</span>: <span class="kw-2">&amp;</span><span class="ident">NodeRef</span><span class="op">&lt;</span><span class="ident">BorrowType</span>, <span class="ident">K</span>, <span class="ident">V</span>, <span class="ident">Type</span><span class="op">&gt;</span>,
    <span class="ident">key</span>: <span class="kw-2">&amp;</span><span class="ident">Q</span>
) <span class="op">-&gt;</span> (<span class="ident">usize</span>, <span class="ident">bool</span>)
        <span class="kw">where</span> <span class="ident">Q</span>: <span class="ident">Ord</span>, <span class="ident">K</span>: <span class="ident">Borrow</span><span class="op">&lt;</span><span class="ident">Q</span><span class="op">&gt;</span> {

    <span class="kw">for</span> (<span class="ident">i</span>, <span class="ident">k</span>) <span class="kw">in</span> <span class="ident">node</span>.<span class="ident">keys</span>().<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
        <span class="kw">match</span> <span class="ident">key</span>.<span class="ident">cmp</span>(<span class="ident">k</span>.<span class="ident">borrow</span>()) {
            <span class="ident">Ordering</span>::<span class="ident">Greater</span> <span class="op">=&gt;</span> {},
            <span class="ident">Ordering</span>::<span class="ident">Equal</span> <span class="op">=&gt;</span> <span class="kw">return</span> (<span class="ident">i</span>, <span class="bool-val">true</span>),
            <span class="ident">Ordering</span>::<span class="ident">Less</span> <span class="op">=&gt;</span> <span class="kw">return</span> (<span class="ident">i</span>, <span class="bool-val">false</span>)
        }
    }
    (<span class="ident">node</span>.<span class="ident">keys</span>().<span class="ident">len</span>(), <span class="bool-val">false</span>)
}
</pre></div>
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