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删除 admin-temp-dir 目录及其内容 更新文档索引以包含 dashmap 相关文件
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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 of the Rust file `C:\Users\szend\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\dashmap-6.1.0\src\util.rs`."><title>util.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="dashmap" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">dashmap/</div>util.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-2"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! This module is full of hackery and dark magic.
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<a href=#2 id=2 data-nosnippet>2</a>//! Either spend a day fixing it and quietly submit a PR or don't mention it to anybody.
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<a href=#3 id=3 data-nosnippet>3</a></span><span class="kw">use </span>core::cell::UnsafeCell;
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<a href=#4 id=4 data-nosnippet>4</a><span class="kw">use </span>core::{mem, ptr};
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<a href=#5 id=5 data-nosnippet>5</a>
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<a href=#6 id=6 data-nosnippet>6</a><span class="kw">pub const fn </span>ptr_size_bits() -> usize {
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<a href=#7 id=7 data-nosnippet>7</a> mem::size_of::<usize>() * <span class="number">8
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<a href=#8 id=8 data-nosnippet>8</a></span>}
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<a href=#9 id=9 data-nosnippet>9</a>
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<a href=#10 id=10 data-nosnippet>10</a><span class="kw">pub fn </span>map_in_place_2<T, U, F: FnOnce(U, T) -> T>((k, v): (U, <span class="kw-2">&mut </span>T), f: F) {
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<a href=#11 id=11 data-nosnippet>11</a> <span class="kw">unsafe </span>{
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<a href=#12 id=12 data-nosnippet>12</a> <span class="comment">// # Safety
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<a href=#13 id=13 data-nosnippet>13</a> //
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<a href=#14 id=14 data-nosnippet>14</a> // If the closure panics, we must abort otherwise we could double drop `T`
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<a href=#15 id=15 data-nosnippet>15</a> </span><span class="kw">let </span>promote_panic_to_abort = AbortOnPanic;
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<a href=#16 id=16 data-nosnippet>16</a>
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<a href=#17 id=17 data-nosnippet>17</a> ptr::write(v, f(k, ptr::read(v)));
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<a href=#18 id=18 data-nosnippet>18</a>
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<a href=#19 id=19 data-nosnippet>19</a> <span class="comment">// If we made it here, the calling thread could have already have panicked, in which case
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<a href=#20 id=20 data-nosnippet>20</a> // We know that the closure did not panic, so don't bother checking.
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<a href=#21 id=21 data-nosnippet>21</a> </span>std::mem::forget(promote_panic_to_abort);
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<a href=#22 id=22 data-nosnippet>22</a> }
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<a href=#23 id=23 data-nosnippet>23</a>}
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<a href=#24 id=24 data-nosnippet>24</a>
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<a href=#25 id=25 data-nosnippet>25</a><span class="doccomment">/// A simple wrapper around `T`
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<a href=#26 id=26 data-nosnippet>26</a>///
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<a href=#27 id=27 data-nosnippet>27</a>/// This is to prevent UB when using `HashMap::get_key_value`, because
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<a href=#28 id=28 data-nosnippet>28</a>/// `HashMap` doesn't expose an api to get the key and value, where
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<a href=#29 id=29 data-nosnippet>29</a>/// the value is a `&mut T`.
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<a href=#30 id=30 data-nosnippet>30</a>///
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<a href=#31 id=31 data-nosnippet>31</a>/// See [#10](https://github.com/xacrimon/dashmap/issues/10) for details
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<a href=#32 id=32 data-nosnippet>32</a>///
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<a href=#33 id=33 data-nosnippet>33</a>/// This type is meant to be an implementation detail, but must be exposed due to the `Dashmap::shards`
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<a href=#34 id=34 data-nosnippet>34</a></span><span class="attr">#[repr(transparent)]
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<a href=#35 id=35 data-nosnippet>35</a></span><span class="kw">pub struct </span>SharedValue<T> {
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<a href=#36 id=36 data-nosnippet>36</a> value: UnsafeCell<T>,
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<a href=#37 id=37 data-nosnippet>37</a>}
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<a href=#38 id=38 data-nosnippet>38</a>
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<a href=#39 id=39 data-nosnippet>39</a><span class="kw">impl</span><T: Clone> Clone <span class="kw">for </span>SharedValue<T> {
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<a href=#40 id=40 data-nosnippet>40</a> <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{
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<a href=#41 id=41 data-nosnippet>41</a> <span class="kw">let </span>inner = <span class="self">self</span>.get().clone();
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<a href=#42 id=42 data-nosnippet>42</a>
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<a href=#43 id=43 data-nosnippet>43</a> <span class="self">Self </span>{
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<a href=#44 id=44 data-nosnippet>44</a> value: UnsafeCell::new(inner),
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<a href=#45 id=45 data-nosnippet>45</a> }
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<a href=#46 id=46 data-nosnippet>46</a> }
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<a href=#47 id=47 data-nosnippet>47</a>}
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<a href=#48 id=48 data-nosnippet>48</a>
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<a href=#49 id=49 data-nosnippet>49</a><span class="kw">unsafe impl</span><T: Send> Send <span class="kw">for </span>SharedValue<T> {}
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<a href=#50 id=50 data-nosnippet>50</a>
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<a href=#51 id=51 data-nosnippet>51</a><span class="kw">unsafe impl</span><T: Sync> Sync <span class="kw">for </span>SharedValue<T> {}
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<a href=#52 id=52 data-nosnippet>52</a>
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<a href=#53 id=53 data-nosnippet>53</a><span class="kw">impl</span><T> SharedValue<T> {
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<a href=#54 id=54 data-nosnippet>54</a> <span class="doccomment">/// Create a new `SharedValue<T>`
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<a href=#55 id=55 data-nosnippet>55</a> </span><span class="kw">pub const fn </span>new(value: T) -> <span class="self">Self </span>{
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<a href=#56 id=56 data-nosnippet>56</a> <span class="self">Self </span>{
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<a href=#57 id=57 data-nosnippet>57</a> value: UnsafeCell::new(value),
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<a href=#58 id=58 data-nosnippet>58</a> }
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<a href=#59 id=59 data-nosnippet>59</a> }
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<a href=#60 id=60 data-nosnippet>60</a>
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<a href=#61 id=61 data-nosnippet>61</a> <span class="doccomment">/// Get a shared reference to `T`
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<a href=#62 id=62 data-nosnippet>62</a> </span><span class="kw">pub fn </span>get(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T {
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<a href=#63 id=63 data-nosnippet>63</a> <span class="kw">unsafe </span>{ <span class="kw-2">&*</span><span class="self">self</span>.value.get() }
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<a href=#64 id=64 data-nosnippet>64</a> }
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<a href=#65 id=65 data-nosnippet>65</a>
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<a href=#66 id=66 data-nosnippet>66</a> <span class="doccomment">/// Get an unique reference to `T`
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<a href=#67 id=67 data-nosnippet>67</a> </span><span class="kw">pub fn </span>get_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T {
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<a href=#68 id=68 data-nosnippet>68</a> <span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span><span class="self">self</span>.value.get() }
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<a href=#69 id=69 data-nosnippet>69</a> }
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<a href=#70 id=70 data-nosnippet>70</a>
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<a href=#71 id=71 data-nosnippet>71</a> <span class="doccomment">/// Unwraps the value
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<a href=#72 id=72 data-nosnippet>72</a> </span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -> T {
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<a href=#73 id=73 data-nosnippet>73</a> <span class="self">self</span>.value.into_inner()
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<a href=#74 id=74 data-nosnippet>74</a> }
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<a href=#75 id=75 data-nosnippet>75</a>
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<a href=#76 id=76 data-nosnippet>76</a> <span class="doccomment">/// Get a mutable raw pointer to the underlying value
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<a href=#77 id=77 data-nosnippet>77</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>as_ptr(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">*mut </span>T {
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<a href=#78 id=78 data-nosnippet>78</a> <span class="self">self</span>.value.get()
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<a href=#79 id=79 data-nosnippet>79</a> }
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<a href=#80 id=80 data-nosnippet>80</a>}
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<a href=#81 id=81 data-nosnippet>81</a>
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<a href=#82 id=82 data-nosnippet>82</a><span class="kw">struct </span>AbortOnPanic;
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<a href=#83 id=83 data-nosnippet>83</a>
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<a href=#84 id=84 data-nosnippet>84</a><span class="kw">impl </span>Drop <span class="kw">for </span>AbortOnPanic {
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<a href=#85 id=85 data-nosnippet>85</a> <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
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<a href=#86 id=86 data-nosnippet>86</a> <span class="kw">if </span>std::thread::panicking() {
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<a href=#87 id=87 data-nosnippet>87</a> std::process::abort()
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<a href=#88 id=88 data-nosnippet>88</a> }
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<a href=#89 id=89 data-nosnippet>89</a> }
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<a href=#90 id=90 data-nosnippet>90</a>}
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</code></pre></div></section></main></body></html> |