| <!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 `crates/intern/src/lib.rs`."><title>lib.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" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-84e720fa.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="intern" data-themes="" data-resource-suffix="" data-rustdoc-version="1.89.0 (29483883e 2025-08-04)" data-channel="1.89.0" data-search-js="search-92309212.js" data-settings-js="settings-5514c975.js" ><script src="../../static.files/storage-4e99c027.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-fd3af306.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-32bb7600.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.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><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">intern/</div>lib.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="doccomment">//! Global `Arc`-based object interning infrastructure. |
| <a href=#2 id=2 data-nosnippet>2</a>//! |
| <a href=#3 id=3 data-nosnippet>3</a>//! Eventually this should probably be replaced with salsa-based interning. |
| <a href=#4 id=4 data-nosnippet>4</a> |
| <a href=#5 id=5 data-nosnippet>5</a></span><span class="kw">use </span>std::{ |
| <a href=#6 id=6 data-nosnippet>6</a> borrow::Borrow, |
| <a href=#7 id=7 data-nosnippet>7</a> fmt::{<span class="self">self</span>, Debug, Display}, |
| <a href=#8 id=8 data-nosnippet>8</a> hash::{BuildHasher, BuildHasherDefault, Hash, Hasher}, |
| <a href=#9 id=9 data-nosnippet>9</a> ops::Deref, |
| <a href=#10 id=10 data-nosnippet>10</a> sync::OnceLock, |
| <a href=#11 id=11 data-nosnippet>11</a>}; |
| <a href=#12 id=12 data-nosnippet>12</a> |
| <a href=#13 id=13 data-nosnippet>13</a><span class="kw">use </span>dashmap::{DashMap, SharedValue}; |
| <a href=#14 id=14 data-nosnippet>14</a><span class="kw">use </span>hashbrown::raw::RawTable; |
| <a href=#15 id=15 data-nosnippet>15</a><span class="kw">use </span>rustc_hash::FxHasher; |
| <a href=#16 id=16 data-nosnippet>16</a><span class="kw">use </span>triomphe::Arc; |
| <a href=#17 id=17 data-nosnippet>17</a> |
| <a href=#18 id=18 data-nosnippet>18</a><span class="kw">type </span>InternMap<T> = DashMap<Arc<T>, (), BuildHasherDefault<FxHasher>>; |
| <a href=#19 id=19 data-nosnippet>19</a><span class="kw">type </span>Guard<T> = dashmap::RwLockWriteGuard<<span class="lifetime">'static</span>, RawTable<(Arc<T>, SharedValue<()>)>>; |
| <a href=#20 id=20 data-nosnippet>20</a> |
| <a href=#21 id=21 data-nosnippet>21</a><span class="kw">mod </span>symbol; |
| <a href=#22 id=22 data-nosnippet>22</a><span class="kw">pub use </span><span class="self">self</span>::symbol::{Symbol, symbols <span class="kw">as </span>sym}; |
| <a href=#23 id=23 data-nosnippet>23</a> |
| <a href=#24 id=24 data-nosnippet>24</a><span class="kw">pub struct </span>Interned<T: Internable + <span class="question-mark">?</span>Sized> { |
| <a href=#25 id=25 data-nosnippet>25</a> arc: Arc<T>, |
| <a href=#26 id=26 data-nosnippet>26</a>} |
| <a href=#27 id=27 data-nosnippet>27</a> |
| <a href=#28 id=28 data-nosnippet>28</a><span class="kw">impl</span><T: Internable> Interned<T> { |
| <a href=#29 id=29 data-nosnippet>29</a> <span class="attr">#[inline] |
| <a href=#30 id=30 data-nosnippet>30</a> </span><span class="kw">pub fn </span>new(obj: T) -> <span class="self">Self </span>{ |
| <a href=#31 id=31 data-nosnippet>31</a> <span class="self">Self</span>::new_generic(obj) |
| <a href=#32 id=32 data-nosnippet>32</a> } |
| <a href=#33 id=33 data-nosnippet>33</a>} |
| <a href=#34 id=34 data-nosnippet>34</a> |
| <a href=#35 id=35 data-nosnippet>35</a><span class="kw">impl </span>Interned<str> { |
| <a href=#36 id=36 data-nosnippet>36</a> <span class="attr">#[inline] |
| <a href=#37 id=37 data-nosnippet>37</a> </span><span class="kw">pub fn </span>new_str(s: <span class="kw-2">&</span>str) -> <span class="self">Self </span>{ |
| <a href=#38 id=38 data-nosnippet>38</a> <span class="self">Self</span>::new_generic(s) |
| <a href=#39 id=39 data-nosnippet>39</a> } |
| <a href=#40 id=40 data-nosnippet>40</a>} |
| <a href=#41 id=41 data-nosnippet>41</a> |
| <a href=#42 id=42 data-nosnippet>42</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> Interned<T> { |
| <a href=#43 id=43 data-nosnippet>43</a> <span class="attr">#[inline] |
| <a href=#44 id=44 data-nosnippet>44</a> </span><span class="kw">pub fn </span>new_generic<U>(obj: U) -> <span class="self">Self |
| <a href=#45 id=45 data-nosnippet>45</a> </span><span class="kw">where |
| <a href=#46 id=46 data-nosnippet>46</a> </span>U: Borrow<T>, |
| <a href=#47 id=47 data-nosnippet>47</a> Arc<T>: From<U>, |
| <a href=#48 id=48 data-nosnippet>48</a> { |
| <a href=#49 id=49 data-nosnippet>49</a> <span class="kw">let </span>storage = T::storage().get(); |
| <a href=#50 id=50 data-nosnippet>50</a> <span class="kw">let </span>(<span class="kw-2">mut </span>shard, hash) = <span class="self">Self</span>::select(storage, obj.borrow()); |
| <a href=#51 id=51 data-nosnippet>51</a> <span class="comment">// Atomically, |
| <a href=#52 id=52 data-nosnippet>52</a> // - check if `obj` is already in the map |
| <a href=#53 id=53 data-nosnippet>53</a> // - if so, clone its `Arc` and return it |
| <a href=#54 id=54 data-nosnippet>54</a> // - if not, box it up, insert it, and return a clone |
| <a href=#55 id=55 data-nosnippet>55</a> // This needs to be atomic (locking the shard) to avoid races with other thread, which could |
| <a href=#56 id=56 data-nosnippet>56</a> // insert the same object between us looking it up and inserting it. |
| <a href=#57 id=57 data-nosnippet>57</a> </span><span class="kw">let </span>bucket = <span class="kw">match </span>shard.find_or_find_insert_slot( |
| <a href=#58 id=58 data-nosnippet>58</a> hash, |
| <a href=#59 id=59 data-nosnippet>59</a> |(other, <span class="kw">_</span>)| <span class="kw-2">**</span>other == <span class="kw-2">*</span>obj.borrow(), |
| <a href=#60 id=60 data-nosnippet>60</a> |(x, <span class="kw">_</span>)| <span class="self">Self</span>::hash(storage, x), |
| <a href=#61 id=61 data-nosnippet>61</a> ) { |
| <a href=#62 id=62 data-nosnippet>62</a> <span class="prelude-val">Ok</span>(bucket) => bucket, |
| <a href=#63 id=63 data-nosnippet>63</a> <span class="comment">// SAFETY: The slot came from `find_or_find_insert_slot()`, and the table wasn't modified since then. |
| <a href=#64 id=64 data-nosnippet>64</a> </span><span class="prelude-val">Err</span>(insert_slot) => <span class="kw">unsafe </span>{ |
| <a href=#65 id=65 data-nosnippet>65</a> shard.insert_in_slot(hash, insert_slot, (Arc::from(obj), SharedValue::new(()))) |
| <a href=#66 id=66 data-nosnippet>66</a> }, |
| <a href=#67 id=67 data-nosnippet>67</a> }; |
| <a href=#68 id=68 data-nosnippet>68</a> <span class="comment">// SAFETY: We just retrieved/inserted this bucket. |
| <a href=#69 id=69 data-nosnippet>69</a> </span><span class="kw">unsafe </span>{ <span class="self">Self </span>{ arc: bucket.as_ref().<span class="number">0</span>.clone() } } |
| <a href=#70 id=70 data-nosnippet>70</a> } |
| <a href=#71 id=71 data-nosnippet>71</a> |
| <a href=#72 id=72 data-nosnippet>72</a> <span class="attr">#[inline] |
| <a href=#73 id=73 data-nosnippet>73</a> </span><span class="kw">fn </span>select(storage: <span class="kw-2">&</span><span class="lifetime">'static </span>InternMap<T>, obj: <span class="kw-2">&</span>T) -> (Guard<T>, u64) { |
| <a href=#74 id=74 data-nosnippet>74</a> <span class="kw">let </span>hash = <span class="self">Self</span>::hash(storage, obj); |
| <a href=#75 id=75 data-nosnippet>75</a> <span class="kw">let </span>shard_idx = storage.determine_shard(hash <span class="kw">as </span>usize); |
| <a href=#76 id=76 data-nosnippet>76</a> <span class="kw">let </span>shard = <span class="kw-2">&</span>storage.shards()[shard_idx]; |
| <a href=#77 id=77 data-nosnippet>77</a> (shard.write(), hash) |
| <a href=#78 id=78 data-nosnippet>78</a> } |
| <a href=#79 id=79 data-nosnippet>79</a> |
| <a href=#80 id=80 data-nosnippet>80</a> <span class="attr">#[inline] |
| <a href=#81 id=81 data-nosnippet>81</a> </span><span class="kw">fn </span>hash(storage: <span class="kw-2">&</span><span class="lifetime">'static </span>InternMap<T>, obj: <span class="kw-2">&</span>T) -> u64 { |
| <a href=#82 id=82 data-nosnippet>82</a> storage.hasher().hash_one(obj) |
| <a href=#83 id=83 data-nosnippet>83</a> } |
| <a href=#84 id=84 data-nosnippet>84</a>} |
| <a href=#85 id=85 data-nosnippet>85</a> |
| <a href=#86 id=86 data-nosnippet>86</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> Drop <span class="kw">for </span>Interned<T> { |
| <a href=#87 id=87 data-nosnippet>87</a> <span class="attr">#[inline] |
| <a href=#88 id=88 data-nosnippet>88</a> </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <a href=#89 id=89 data-nosnippet>89</a> <span class="comment">// When the last `Ref` is dropped, remove the object from the global map. |
| <a href=#90 id=90 data-nosnippet>90</a> </span><span class="kw">if </span>Arc::count(<span class="kw-2">&</span><span class="self">self</span>.arc) == <span class="number">2 </span>{ |
| <a href=#91 id=91 data-nosnippet>91</a> <span class="comment">// Only `self` and the global map point to the object. |
| <a href=#92 id=92 data-nosnippet>92</a> |
| <a href=#93 id=93 data-nosnippet>93</a> </span><span class="self">self</span>.drop_slow(); |
| <a href=#94 id=94 data-nosnippet>94</a> } |
| <a href=#95 id=95 data-nosnippet>95</a> } |
| <a href=#96 id=96 data-nosnippet>96</a>} |
| <a href=#97 id=97 data-nosnippet>97</a> |
| <a href=#98 id=98 data-nosnippet>98</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> Interned<T> { |
| <a href=#99 id=99 data-nosnippet>99</a> <span class="attr">#[cold] |
| <a href=#100 id=100 data-nosnippet>100</a> </span><span class="kw">fn </span>drop_slow(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <a href=#101 id=101 data-nosnippet>101</a> <span class="kw">let </span>storage = T::storage().get(); |
| <a href=#102 id=102 data-nosnippet>102</a> <span class="kw">let </span>(<span class="kw-2">mut </span>shard, hash) = <span class="self">Self</span>::select(storage, <span class="kw-2">&</span><span class="self">self</span>.arc); |
| <a href=#103 id=103 data-nosnippet>103</a> |
| <a href=#104 id=104 data-nosnippet>104</a> <span class="kw">if </span>Arc::count(<span class="kw-2">&</span><span class="self">self</span>.arc) != <span class="number">2 </span>{ |
| <a href=#105 id=105 data-nosnippet>105</a> <span class="comment">// Another thread has interned another copy |
| <a href=#106 id=106 data-nosnippet>106</a> </span><span class="kw">return</span>; |
| <a href=#107 id=107 data-nosnippet>107</a> } |
| <a href=#108 id=108 data-nosnippet>108</a> |
| <a href=#109 id=109 data-nosnippet>109</a> shard.remove_entry(hash, |(other, <span class="kw">_</span>)| <span class="kw-2">**</span>other == <span class="kw-2">*</span><span class="self">self</span>.arc); |
| <a href=#110 id=110 data-nosnippet>110</a> |
| <a href=#111 id=111 data-nosnippet>111</a> <span class="comment">// Shrink the backing storage if the shard is less than 50% occupied. |
| <a href=#112 id=112 data-nosnippet>112</a> </span><span class="kw">if </span>shard.len() * <span class="number">2 </span>< shard.capacity() { |
| <a href=#113 id=113 data-nosnippet>113</a> <span class="kw">let </span>len = shard.len(); |
| <a href=#114 id=114 data-nosnippet>114</a> shard.shrink_to(len, |(x, <span class="kw">_</span>)| <span class="self">Self</span>::hash(storage, x)); |
| <a href=#115 id=115 data-nosnippet>115</a> } |
| <a href=#116 id=116 data-nosnippet>116</a> } |
| <a href=#117 id=117 data-nosnippet>117</a>} |
| <a href=#118 id=118 data-nosnippet>118</a> |
| <a href=#119 id=119 data-nosnippet>119</a><span class="doccomment">/// Compares interned `Ref`s using pointer equality. |
| <a href=#120 id=120 data-nosnippet>120</a></span><span class="kw">impl</span><T: Internable> PartialEq <span class="kw">for </span>Interned<T> { |
| <a href=#121 id=121 data-nosnippet>121</a> <span class="comment">// NOTE: No `?Sized` because `ptr_eq` doesn't work right with trait objects. |
| <a href=#122 id=122 data-nosnippet>122</a> |
| <a href=#123 id=123 data-nosnippet>123</a> </span><span class="attr">#[inline] |
| <a href=#124 id=124 data-nosnippet>124</a> </span><span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <a href=#125 id=125 data-nosnippet>125</a> Arc::ptr_eq(<span class="kw-2">&</span><span class="self">self</span>.arc, <span class="kw-2">&</span>other.arc) |
| <a href=#126 id=126 data-nosnippet>126</a> } |
| <a href=#127 id=127 data-nosnippet>127</a>} |
| <a href=#128 id=128 data-nosnippet>128</a> |
| <a href=#129 id=129 data-nosnippet>129</a><span class="kw">impl</span><T: Internable> Eq <span class="kw">for </span>Interned<T> {} |
| <a href=#130 id=130 data-nosnippet>130</a> |
| <a href=#131 id=131 data-nosnippet>131</a><span class="kw">impl </span>PartialEq <span class="kw">for </span>Interned<str> { |
| <a href=#132 id=132 data-nosnippet>132</a> <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool { |
| <a href=#133 id=133 data-nosnippet>133</a> Arc::ptr_eq(<span class="kw-2">&</span><span class="self">self</span>.arc, <span class="kw-2">&</span>other.arc) |
| <a href=#134 id=134 data-nosnippet>134</a> } |
| <a href=#135 id=135 data-nosnippet>135</a>} |
| <a href=#136 id=136 data-nosnippet>136</a> |
| <a href=#137 id=137 data-nosnippet>137</a><span class="kw">impl </span>Eq <span class="kw">for </span>Interned<str> {} |
| <a href=#138 id=138 data-nosnippet>138</a> |
| <a href=#139 id=139 data-nosnippet>139</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> Hash <span class="kw">for </span>Interned<T> { |
| <a href=#140 id=140 data-nosnippet>140</a> <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, state: <span class="kw-2">&mut </span>H) { |
| <a href=#141 id=141 data-nosnippet>141</a> <span class="comment">// NOTE: Cast disposes vtable pointer / slice/str length. |
| <a href=#142 id=142 data-nosnippet>142</a> </span>state.write_usize(Arc::as_ptr(<span class="kw-2">&</span><span class="self">self</span>.arc) <span class="kw">as </span><span class="kw-2">*const </span>() <span class="kw">as </span>usize) |
| <a href=#143 id=143 data-nosnippet>143</a> } |
| <a href=#144 id=144 data-nosnippet>144</a>} |
| <a href=#145 id=145 data-nosnippet>145</a> |
| <a href=#146 id=146 data-nosnippet>146</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> AsRef<T> <span class="kw">for </span>Interned<T> { |
| <a href=#147 id=147 data-nosnippet>147</a> <span class="attr">#[inline] |
| <a href=#148 id=148 data-nosnippet>148</a> </span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <a href=#149 id=149 data-nosnippet>149</a> <span class="kw-2">&</span><span class="self">self</span>.arc |
| <a href=#150 id=150 data-nosnippet>150</a> } |
| <a href=#151 id=151 data-nosnippet>151</a>} |
| <a href=#152 id=152 data-nosnippet>152</a> |
| <a href=#153 id=153 data-nosnippet>153</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> Deref <span class="kw">for </span>Interned<T> { |
| <a href=#154 id=154 data-nosnippet>154</a> <span class="kw">type </span>Target = T; |
| <a href=#155 id=155 data-nosnippet>155</a> |
| <a href=#156 id=156 data-nosnippet>156</a> <span class="attr">#[inline] |
| <a href=#157 id=157 data-nosnippet>157</a> </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::Target { |
| <a href=#158 id=158 data-nosnippet>158</a> <span class="kw-2">&</span><span class="self">self</span>.arc |
| <a href=#159 id=159 data-nosnippet>159</a> } |
| <a href=#160 id=160 data-nosnippet>160</a>} |
| <a href=#161 id=161 data-nosnippet>161</a> |
| <a href=#162 id=162 data-nosnippet>162</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> Clone <span class="kw">for </span>Interned<T> { |
| <a href=#163 id=163 data-nosnippet>163</a> <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <a href=#164 id=164 data-nosnippet>164</a> <span class="self">Self </span>{ arc: <span class="self">self</span>.arc.clone() } |
| <a href=#165 id=165 data-nosnippet>165</a> } |
| <a href=#166 id=166 data-nosnippet>166</a>} |
| <a href=#167 id=167 data-nosnippet>167</a> |
| <a href=#168 id=168 data-nosnippet>168</a><span class="kw">impl</span><T: Debug + Internable + <span class="question-mark">?</span>Sized> Debug <span class="kw">for </span>Interned<T> { |
| <a href=#169 id=169 data-nosnippet>169</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#170 id=170 data-nosnippet>170</a> (<span class="kw-2">*</span><span class="self">self</span>.arc).fmt(f) |
| <a href=#171 id=171 data-nosnippet>171</a> } |
| <a href=#172 id=172 data-nosnippet>172</a>} |
| <a href=#173 id=173 data-nosnippet>173</a> |
| <a href=#174 id=174 data-nosnippet>174</a><span class="kw">impl</span><T: Display + Internable + <span class="question-mark">?</span>Sized> Display <span class="kw">for </span>Interned<T> { |
| <a href=#175 id=175 data-nosnippet>175</a> <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| <a href=#176 id=176 data-nosnippet>176</a> (<span class="kw-2">*</span><span class="self">self</span>.arc).fmt(f) |
| <a href=#177 id=177 data-nosnippet>177</a> } |
| <a href=#178 id=178 data-nosnippet>178</a>} |
| <a href=#179 id=179 data-nosnippet>179</a> |
| <a href=#180 id=180 data-nosnippet>180</a><span class="kw">pub struct </span>InternStorage<T: <span class="question-mark">?</span>Sized> { |
| <a href=#181 id=181 data-nosnippet>181</a> map: OnceLock<InternMap<T>>, |
| <a href=#182 id=182 data-nosnippet>182</a>} |
| <a href=#183 id=183 data-nosnippet>183</a> |
| <a href=#184 id=184 data-nosnippet>184</a><span class="attr">#[allow( |
| <a href=#185 id=185 data-nosnippet>185</a> clippy::new_without_default, |
| <a href=#186 id=186 data-nosnippet>186</a> reason = <span class="string">"this a const fn, so it can't be default yet. See <https://github.com/rust-lang/rust/issues/63065>" |
| <a href=#187 id=187 data-nosnippet>187</a></span>)] |
| <a href=#188 id=188 data-nosnippet>188</a></span><span class="kw">impl</span><T: <span class="question-mark">?</span>Sized> InternStorage<T> { |
| <a href=#189 id=189 data-nosnippet>189</a> <span class="kw">pub const fn </span>new() -> <span class="self">Self </span>{ |
| <a href=#190 id=190 data-nosnippet>190</a> <span class="self">Self </span>{ map: OnceLock::new() } |
| <a href=#191 id=191 data-nosnippet>191</a> } |
| <a href=#192 id=192 data-nosnippet>192</a>} |
| <a href=#193 id=193 data-nosnippet>193</a> |
| <a href=#194 id=194 data-nosnippet>194</a><span class="kw">impl</span><T: Internable + <span class="question-mark">?</span>Sized> InternStorage<T> { |
| <a href=#195 id=195 data-nosnippet>195</a> <span class="kw">fn </span>get(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>InternMap<T> { |
| <a href=#196 id=196 data-nosnippet>196</a> <span class="self">self</span>.map.get_or_init(DashMap::default) |
| <a href=#197 id=197 data-nosnippet>197</a> } |
| <a href=#198 id=198 data-nosnippet>198</a>} |
| <a href=#199 id=199 data-nosnippet>199</a> |
| <a href=#200 id=200 data-nosnippet>200</a><span class="kw">pub trait </span>Internable: Hash + Eq + <span class="lifetime">'static </span>{ |
| <a href=#201 id=201 data-nosnippet>201</a> <span class="kw">fn </span>storage() -> <span class="kw-2">&</span><span class="lifetime">'static </span>InternStorage<<span class="self">Self</span>>; |
| <a href=#202 id=202 data-nosnippet>202</a>} |
| <a href=#203 id=203 data-nosnippet>203</a> |
| <a href=#204 id=204 data-nosnippet>204</a><span class="doccomment">/// Implements `Internable` for a given list of types, making them usable with `Interned`. |
| <a href=#205 id=205 data-nosnippet>205</a></span><span class="attr">#[macro_export] |
| <a href=#206 id=206 data-nosnippet>206</a>#[doc(hidden)] |
| <a href=#207 id=207 data-nosnippet>207</a></span><span class="macro">macro_rules!</span> _impl_internable { |
| <a href=#208 id=208 data-nosnippet>208</a> ( $(<span class="macro-nonterminal">$t</span>:path),+ $(,)<span class="question-mark">? </span>) => { $( |
| <a href=#209 id=209 data-nosnippet>209</a> <span class="kw">impl </span><span class="macro-nonterminal">$crate::Internable </span><span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <a href=#210 id=210 data-nosnippet>210</a> <span class="kw">fn </span>storage() -> <span class="kw-2">&</span><span class="lifetime">'static </span><span class="macro-nonterminal">$crate::InternStorage</span><<span class="self">Self</span>> { |
| <a href=#211 id=211 data-nosnippet>211</a> <span class="kw">static </span>STORAGE: <span class="macro-nonterminal">$crate::InternStorage</span><<span class="macro-nonterminal">$t</span>> = <span class="macro-nonterminal">$crate::InternStorage::new</span>(); |
| <a href=#212 id=212 data-nosnippet>212</a> <span class="kw-2">&</span>STORAGE |
| <a href=#213 id=213 data-nosnippet>213</a> } |
| <a href=#214 id=214 data-nosnippet>214</a> } |
| <a href=#215 id=215 data-nosnippet>215</a> )+ }; |
| <a href=#216 id=216 data-nosnippet>216</a>} |
| <a href=#217 id=217 data-nosnippet>217</a> |
| <a href=#218 id=218 data-nosnippet>218</a><span class="kw">pub use </span><span class="kw">crate</span>::_impl_internable <span class="kw">as </span>impl_internable; |
| <a href=#219 id=219 data-nosnippet>219</a> |
| <a href=#220 id=220 data-nosnippet>220</a><span class="macro">impl_internable!</span>(str,);</code></pre></div></section></main></body></html> |
