| <!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-0.10.5/src/group_map.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>group_map.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> |
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| </pre><pre class="rust"><code><span class="attribute">#![cfg(feature = <span class="string">"use_std"</span>)] |
| |
| </span><span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::hash::Hash; |
| <span class="kw">use </span>std::iter::Iterator; |
| |
| <span class="doccomment">/// Return a `HashMap` of keys mapped to a list of their corresponding values. |
| /// |
| /// See [`.into_group_map()`](crate::Itertools::into_group_map) |
| /// for more information. |
| </span><span class="kw">pub fn </span>into_group_map<I, K, V>(iter: I) -> HashMap<K, Vec<V>> |
| <span class="kw">where </span>I: Iterator<Item=(K, V)>, |
| K: Hash + Eq, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>lookup = HashMap::new(); |
| |
| iter.for_each(|(key, val)| { |
| lookup.entry(key).or_insert_with(Vec::new).push(val); |
| }); |
| |
| lookup |
| } |
| |
| <span class="kw">pub fn </span>into_group_map_by<I, K, V>(iter: I, f: <span class="kw">impl </span>Fn(<span class="kw-2">&</span>V) -> K) -> HashMap<K, Vec<V>> |
| <span class="kw">where |
| </span>I: Iterator<Item=V>, |
| K: Hash + Eq, |
| { |
| into_group_map( |
| iter.map(|v| (f(<span class="kw-2">&</span>v), v)) |
| ) |
| } |
| </code></pre></div> |
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