| <!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 `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/itertools-0.8.2/src/either_or_both.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>either_or_both.rs - source</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" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../itertools/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../itertools/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><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"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>EitherOrBoth::<span class="kw-2">*</span>; |
| |
| <span class="kw">use </span>either::Either; |
| |
| <span class="doccomment">/// Value that either holds a single A or B, or both. |
| </span><span class="attribute">#[derive(Clone, PartialEq, Eq, Debug)] |
| </span><span class="kw">pub enum </span>EitherOrBoth<A, B> { |
| <span class="doccomment">/// Both values are present. |
| </span>Both(A, B), |
| <span class="doccomment">/// Only the left value of type `A` is present. |
| </span>Left(A), |
| <span class="doccomment">/// Only the right value of type `B` is present. |
| </span>Right(B), |
| } |
| |
| <span class="kw">impl</span><A, B> EitherOrBoth<A, B> { |
| <span class="doccomment">/// If `Left`, or `Both`, return true, otherwise, return false. |
| </span><span class="kw">pub fn </span>has_left(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_ref().left().is_some() |
| } |
| |
| <span class="doccomment">/// If `Right`, or `Both`, return true, otherwise, return false. |
| </span><span class="kw">pub fn </span>has_right(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_ref().right().is_some() |
| } |
| |
| <span class="doccomment">/// If Left, return true otherwise, return false. |
| /// Exclusive version of [`has_left`]. |
| </span><span class="kw">pub fn </span>is_left(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Left(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If Right, return true otherwise, return false. |
| /// Exclusive version of [`has_right`]. |
| </span><span class="kw">pub fn </span>is_right(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Right(<span class="kw">_</span>) => <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If Right, return true otherwise, return false. |
| /// Equivalent to `self.as_ref().both().is_some()`. |
| </span><span class="kw">pub fn </span>is_both(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.as_ref().both().is_some() |
| } |
| |
| <span class="doccomment">/// If `Left`, or `Both`, return `Some` with the left value, otherwise, return `None`. |
| </span><span class="kw">pub fn </span>left(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><A> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(left) | Both(left, <span class="kw">_</span>) => <span class="prelude-val">Some</span>(left), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If `Right`, or `Both`, return `Some` with the right value, otherwise, return `None`. |
| </span><span class="kw">pub fn </span>right(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><B> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Right(right) | Both(<span class="kw">_</span>, right) => <span class="prelude-val">Some</span>(right), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// If Both, return `Some` tuple containing left and right. |
| </span><span class="kw">pub fn </span>both(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><(A, B)> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Both(a, b) => <span class="prelude-val">Some</span>((a, b)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Converts from `&EitherOrBoth<A, B>` to `EitherOrBoth<&A, &B>`. |
| </span><span class="kw">pub fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> EitherOrBoth<<span class="kw-2">&</span>A, <span class="kw-2">&</span>B> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Left(<span class="kw-2">ref </span>left) => Left(left), |
| Right(<span class="kw-2">ref </span>right) => Right(right), |
| Both(<span class="kw-2">ref </span>left, <span class="kw-2">ref </span>right) => Both(left, right), |
| } |
| } |
| |
| <span class="doccomment">/// Converts from `&mut EitherOrBoth<A, B>` to `EitherOrBoth<&mut A, &mut B>`. |
| </span><span class="kw">pub fn </span>as_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> EitherOrBoth<<span class="kw-2">&mut </span>A, <span class="kw-2">&mut </span>B> { |
| <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| Left(<span class="kw-2">ref mut </span>left) => Left(left), |
| Right(<span class="kw-2">ref mut </span>right) => Right(right), |
| Both(<span class="kw-2">ref mut </span>left, <span class="kw-2">ref mut </span>right) => Both(left, right), |
| } |
| } |
| |
| <span class="doccomment">/// Convert `EitherOrBoth<A, B>` to `EitherOrBoth<B, A>`. |
| </span><span class="kw">pub fn </span>flip(<span class="self">self</span>) -> EitherOrBoth<B, A> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(a) => Right(a), |
| Right(b) => Left(b), |
| Both(a, b) => Both(b, a), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value `a` in `Left(a)` or `Both(a, b)` variants. If it is |
| /// present rewrapping the result in `self`'s original variant. |
| </span><span class="kw">pub fn </span>map_left<F, M>(<span class="self">self</span>, f: F) -> EitherOrBoth<M, B> |
| <span class="kw">where |
| </span>F: FnOnce(A) -> M, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Both(a, b) => Both(f(a), b), |
| Left(a) => Left(f(a)), |
| Right(b) => Right(b), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value `b` in `Right(b)` or `Both(a, b)` variants. |
| /// If it is present rewrapping the result in `self`'s original variant. |
| </span><span class="kw">pub fn </span>map_right<F, M>(<span class="self">self</span>, f: F) -> EitherOrBoth<A, M> |
| <span class="kw">where |
| </span>F: FnOnce(B) -> M, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(a) => Left(a), |
| Right(b) => Right(f(b)), |
| Both(a, b) => Both(a, f(b)), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the functions `f` and `g` on the value `a` and `b` respectively; |
| /// found in `Left(a)`, `Right(b)`, or `Both(a, b)` variants. |
| /// The Result is rewrapped `self`'s original variant. |
| </span><span class="kw">pub fn </span>map_any<F, L, G, R>(<span class="self">self</span>, f: F, g: G) -> EitherOrBoth<L, R> |
| <span class="kw">where |
| </span>F: FnOnce(A) -> L, |
| G: FnOnce(B) -> R, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(a) => Left(f(a)), |
| Right(b) => Right(g(b)), |
| Both(a, b) => Both(f(a), g(b)), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value `b` in `Right(b)` or `Both(a, _)` variants if it is |
| /// present. |
| </span><span class="kw">pub fn </span>left_and_then<F, L>(<span class="self">self</span>, f: F) -> EitherOrBoth<L, B> |
| <span class="kw">where |
| </span>F: FnOnce(A) -> EitherOrBoth<L, B>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(a) | Both(a, <span class="kw">_</span>) => f(a), |
| Right(b) => Right(b), |
| } |
| } |
| |
| <span class="doccomment">/// Apply the function `f` on the value `a` |
| /// in `Left(a)` or `Both(a, _)` variants if it is present. |
| </span><span class="kw">pub fn </span>right_and_then<F, R>(<span class="self">self</span>, f: F) -> EitherOrBoth<A, R> |
| <span class="kw">where |
| </span>F: FnOnce(B) -> EitherOrBoth<A, R>, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(a) => Left(a), |
| Right(b) | Both(<span class="kw">_</span>, b) => f(b), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T> EitherOrBoth<T, T> { |
| <span class="doccomment">/// Return either value of left, right, or the product of `f` applied where `Both` are present. |
| </span><span class="kw">pub fn </span>reduce<F>(<span class="self">self</span>, f: F) -> T |
| <span class="kw">where |
| </span>F: FnOnce(T, T) -> T, |
| { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Left(a) => a, |
| Right(b) => b, |
| Both(a, b) => f(a, b), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B> Into<<span class="prelude-ty">Option</span><Either<A, B>>> <span class="kw">for </span>EitherOrBoth<A, B> { |
| <span class="kw">fn </span>into(<span class="self">self</span>) -> <span class="prelude-ty">Option</span><Either<A, B>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| EitherOrBoth::Left(l) => <span class="prelude-val">Some</span>(Either::Left(l)), |
| EitherOrBoth::Right(r) => <span class="prelude-val">Some</span>(Either::Right(r)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="itertools" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
