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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 `/root/.cargo/git/checkouts/rayon-3b3b152053499ede/a07ce2e/src/iter/extend.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>extend.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="../../../rayon/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="../../../rayon/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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<span id="601">601</span>
<span id="602">602</span>
<span id="603">603</span>
<span id="604">604</span>
</pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::noop::NoopConsumer;
<span class="kw">use </span><span class="kw">super</span>::plumbing::{Consumer, Folder, Reducer, UnindexedConsumer};
<span class="kw">use super</span>::{IntoParallelIterator, ParallelExtend, ParallelIterator};
<span class="kw">use </span>std::borrow::Cow;
<span class="kw">use </span>std::collections::LinkedList;
<span class="kw">use </span>std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
<span class="kw">use </span>std::collections::{BinaryHeap, VecDeque};
<span class="kw">use </span>std::hash::{BuildHasher, Hash};
<span class="doccomment">/// Performs a generic `par_extend` by collecting to a `LinkedList&lt;Vec&lt;_&gt;&gt;` in
/// parallel, then extending the collection sequentially.
</span><span class="macro">macro_rules! </span>extend {
(<span class="macro-nonterminal">$self</span>:ident, <span class="macro-nonterminal">$par_iter</span>:ident, <span class="macro-nonterminal">$extend</span>:ident) =&gt; {
<span class="macro-nonterminal">$extend</span>(
<span class="macro-nonterminal">$self</span>,
<span class="macro-nonterminal">$par_iter</span>.into_par_iter().drive_unindexed(ListVecConsumer),
);
};
}
<span class="doccomment">/// Computes the total length of a `LinkedList&lt;Vec&lt;_&gt;&gt;`.
</span><span class="kw">fn </span>len&lt;T&gt;(list: <span class="kw-2">&amp;</span>LinkedList&lt;Vec&lt;T&gt;&gt;) -&gt; usize {
list.iter().map(Vec::len).sum()
}
<span class="kw">struct </span>ListVecConsumer;
<span class="kw">struct </span>ListVecFolder&lt;T&gt; {
vec: Vec&lt;T&gt;,
}
<span class="kw">impl</span>&lt;T: Send&gt; Consumer&lt;T&gt; <span class="kw">for </span>ListVecConsumer {
<span class="kw">type </span>Folder = ListVecFolder&lt;T&gt;;
<span class="kw">type </span>Reducer = ListReducer;
<span class="kw">type </span><span class="prelude-ty">Result </span>= LinkedList&lt;Vec&lt;T&gt;&gt;;
<span class="kw">fn </span>split_at(<span class="self">self</span>, _index: usize) -&gt; (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::Reducer) {
(<span class="self">Self</span>, <span class="self">Self</span>, ListReducer)
}
<span class="kw">fn </span>into_folder(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Folder {
ListVecFolder { vec: Vec::new() }
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="bool-val">false
</span>}
}
<span class="kw">impl</span>&lt;T: Send&gt; UnindexedConsumer&lt;T&gt; <span class="kw">for </span>ListVecConsumer {
<span class="kw">fn </span>split_off_left(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
<span class="self">Self
</span>}
<span class="kw">fn </span>to_reducer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Reducer {
ListReducer
}
}
<span class="kw">impl</span>&lt;T&gt; Folder&lt;T&gt; <span class="kw">for </span>ListVecFolder&lt;T&gt; {
<span class="kw">type </span><span class="prelude-ty">Result </span>= LinkedList&lt;Vec&lt;T&gt;&gt;;
<span class="kw">fn </span>consume(<span class="kw-2">mut </span><span class="self">self</span>, item: T) -&gt; <span class="self">Self </span>{
<span class="self">self</span>.vec.push(item);
<span class="self">self
</span>}
<span class="kw">fn </span>consume_iter&lt;I&gt;(<span class="kw-2">mut </span><span class="self">self</span>, iter: I) -&gt; <span class="self">Self
</span><span class="kw">where
</span>I: IntoIterator&lt;Item = T&gt;,
{
<span class="self">self</span>.vec.extend(iter);
<span class="self">self
</span>}
<span class="kw">fn </span>complete(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Result {
<span class="kw">let </span><span class="kw-2">mut </span>list = LinkedList::new();
<span class="kw">if </span>!<span class="self">self</span>.vec.is_empty() {
list.push_back(<span class="self">self</span>.vec);
}
list
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="bool-val">false
</span>}
}
<span class="kw">fn </span>heap_extend&lt;T, Item&gt;(heap: <span class="kw-2">&amp;mut </span>BinaryHeap&lt;T&gt;, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>BinaryHeap&lt;T&gt;: Extend&lt;Item&gt;,
{
heap.reserve(len(<span class="kw-2">&amp;</span>list));
<span class="kw">for </span>vec <span class="kw">in </span>list {
heap.extend(vec);
}
}
<span class="doccomment">/// Extends a binary heap with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;T&gt; ParallelExtend&lt;T&gt; <span class="kw">for </span>BinaryHeap&lt;T&gt;
<span class="kw">where
</span>T: Ord + Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, heap_extend);
}
}
<span class="doccomment">/// Extends a binary heap with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt; <span class="kw">for </span>BinaryHeap&lt;T&gt;
<span class="kw">where
</span>T: <span class="lifetime">&#39;a </span>+ Copy + Ord + Send + Sync,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, heap_extend);
}
}
<span class="kw">fn </span>btree_map_extend&lt;K, V, Item&gt;(map: <span class="kw-2">&amp;mut </span>BTreeMap&lt;K, V&gt;, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>BTreeMap&lt;K, V&gt;: Extend&lt;Item&gt;,
{
<span class="kw">for </span>vec <span class="kw">in </span>list {
map.extend(vec);
}
}
<span class="doccomment">/// Extends a B-tree map with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;K, V&gt; ParallelExtend&lt;(K, V)&gt; <span class="kw">for </span>BTreeMap&lt;K, V&gt;
<span class="kw">where
</span>K: Ord + Send,
V: Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = (K, V)&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, btree_map_extend);
}
}
<span class="doccomment">/// Extends a B-tree map with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, K: <span class="lifetime">&#39;a</span>, V: <span class="lifetime">&#39;a</span>&gt; ParallelExtend&lt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>V)&gt; <span class="kw">for </span>BTreeMap&lt;K, V&gt;
<span class="kw">where
</span>K: Copy + Ord + Send + Sync,
V: Copy + Send + Sync,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = (<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>V)&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, btree_map_extend);
}
}
<span class="kw">fn </span>btree_set_extend&lt;T, Item&gt;(set: <span class="kw-2">&amp;mut </span>BTreeSet&lt;T&gt;, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>BTreeSet&lt;T&gt;: Extend&lt;Item&gt;,
{
<span class="kw">for </span>vec <span class="kw">in </span>list {
set.extend(vec);
}
}
<span class="doccomment">/// Extends a B-tree set with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;T&gt; ParallelExtend&lt;T&gt; <span class="kw">for </span>BTreeSet&lt;T&gt;
<span class="kw">where
</span>T: Ord + Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, btree_set_extend);
}
}
<span class="doccomment">/// Extends a B-tree set with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt; <span class="kw">for </span>BTreeSet&lt;T&gt;
<span class="kw">where
</span>T: <span class="lifetime">&#39;a </span>+ Copy + Ord + Send + Sync,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, btree_set_extend);
}
}
<span class="kw">fn </span>hash_map_extend&lt;K, V, S, Item&gt;(map: <span class="kw-2">&amp;mut </span>HashMap&lt;K, V, S&gt;, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>HashMap&lt;K, V, S&gt;: Extend&lt;Item&gt;,
K: Eq + Hash,
S: BuildHasher,
{
map.reserve(len(<span class="kw-2">&amp;</span>list));
<span class="kw">for </span>vec <span class="kw">in </span>list {
map.extend(vec);
}
}
<span class="doccomment">/// Extends a hash map with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;K, V, S&gt; ParallelExtend&lt;(K, V)&gt; <span class="kw">for </span>HashMap&lt;K, V, S&gt;
<span class="kw">where
</span>K: Eq + Hash + Send,
V: Send,
S: BuildHasher + Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = (K, V)&gt;,
{
<span class="comment">// See the map_collect benchmarks in rayon-demo for different strategies.
</span><span class="macro">extend!</span>(<span class="self">self</span>, par_iter, hash_map_extend);
}
}
<span class="doccomment">/// Extends a hash map with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, K: <span class="lifetime">&#39;a</span>, V: <span class="lifetime">&#39;a</span>, S&gt; ParallelExtend&lt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>V)&gt; <span class="kw">for </span>HashMap&lt;K, V, S&gt;
<span class="kw">where
</span>K: Copy + Eq + Hash + Send + Sync,
V: Copy + Send + Sync,
S: BuildHasher + Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = (<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>K, <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>V)&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, hash_map_extend);
}
}
<span class="kw">fn </span>hash_set_extend&lt;T, S, Item&gt;(set: <span class="kw-2">&amp;mut </span>HashSet&lt;T, S&gt;, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>HashSet&lt;T, S&gt;: Extend&lt;Item&gt;,
T: Eq + Hash,
S: BuildHasher,
{
set.reserve(len(<span class="kw-2">&amp;</span>list));
<span class="kw">for </span>vec <span class="kw">in </span>list {
set.extend(vec);
}
}
<span class="doccomment">/// Extends a hash set with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;T, S&gt; ParallelExtend&lt;T&gt; <span class="kw">for </span>HashSet&lt;T, S&gt;
<span class="kw">where
</span>T: Eq + Hash + Send,
S: BuildHasher + Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, hash_set_extend);
}
}
<span class="doccomment">/// Extends a hash set with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T, S&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt; <span class="kw">for </span>HashSet&lt;T, S&gt;
<span class="kw">where
</span>T: <span class="lifetime">&#39;a </span>+ Copy + Eq + Hash + Send + Sync,
S: BuildHasher + Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, hash_set_extend);
}
}
<span class="doccomment">/// Extends a linked list with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;T&gt; ParallelExtend&lt;T&gt; <span class="kw">for </span>LinkedList&lt;T&gt;
<span class="kw">where
</span>T: Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = T&gt;,
{
<span class="kw">let </span><span class="kw-2">mut </span>list = par_iter.into_par_iter().drive_unindexed(ListConsumer);
<span class="self">self</span>.append(<span class="kw-2">&amp;mut </span>list);
}
}
<span class="doccomment">/// Extends a linked list with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt; <span class="kw">for </span>LinkedList&lt;T&gt;
<span class="kw">where
</span>T: <span class="lifetime">&#39;a </span>+ Copy + Send + Sync,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt;,
{
<span class="self">self</span>.par_extend(par_iter.into_par_iter().copied())
}
}
<span class="kw">struct </span>ListConsumer;
<span class="kw">struct </span>ListFolder&lt;T&gt; {
list: LinkedList&lt;T&gt;,
}
<span class="kw">struct </span>ListReducer;
<span class="kw">impl</span>&lt;T: Send&gt; Consumer&lt;T&gt; <span class="kw">for </span>ListConsumer {
<span class="kw">type </span>Folder = ListFolder&lt;T&gt;;
<span class="kw">type </span>Reducer = ListReducer;
<span class="kw">type </span><span class="prelude-ty">Result </span>= LinkedList&lt;T&gt;;
<span class="kw">fn </span>split_at(<span class="self">self</span>, _index: usize) -&gt; (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::Reducer) {
(<span class="self">Self</span>, <span class="self">Self</span>, ListReducer)
}
<span class="kw">fn </span>into_folder(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Folder {
ListFolder {
list: LinkedList::new(),
}
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="bool-val">false
</span>}
}
<span class="kw">impl</span>&lt;T: Send&gt; UnindexedConsumer&lt;T&gt; <span class="kw">for </span>ListConsumer {
<span class="kw">fn </span>split_off_left(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
<span class="self">Self
</span>}
<span class="kw">fn </span>to_reducer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Reducer {
ListReducer
}
}
<span class="kw">impl</span>&lt;T&gt; Folder&lt;T&gt; <span class="kw">for </span>ListFolder&lt;T&gt; {
<span class="kw">type </span><span class="prelude-ty">Result </span>= LinkedList&lt;T&gt;;
<span class="kw">fn </span>consume(<span class="kw-2">mut </span><span class="self">self</span>, item: T) -&gt; <span class="self">Self </span>{
<span class="self">self</span>.list.push_back(item);
<span class="self">self
</span>}
<span class="kw">fn </span>consume_iter&lt;I&gt;(<span class="kw-2">mut </span><span class="self">self</span>, iter: I) -&gt; <span class="self">Self
</span><span class="kw">where
</span>I: IntoIterator&lt;Item = T&gt;,
{
<span class="self">self</span>.list.extend(iter);
<span class="self">self
</span>}
<span class="kw">fn </span>complete(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Result {
<span class="self">self</span>.list
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="bool-val">false
</span>}
}
<span class="kw">impl</span>&lt;T&gt; Reducer&lt;LinkedList&lt;T&gt;&gt; <span class="kw">for </span>ListReducer {
<span class="kw">fn </span>reduce(<span class="self">self</span>, <span class="kw-2">mut </span>left: LinkedList&lt;T&gt;, <span class="kw-2">mut </span>right: LinkedList&lt;T&gt;) -&gt; LinkedList&lt;T&gt; {
left.append(<span class="kw-2">&amp;mut </span>right);
left
}
}
<span class="kw">fn </span>flat_string_extend(string: <span class="kw-2">&amp;mut </span>String, list: LinkedList&lt;String&gt;) {
string.reserve(list.iter().map(String::len).sum());
string.extend(list);
}
<span class="doccomment">/// Extends a string with characters from a parallel iterator.
</span><span class="kw">impl </span>ParallelExtend&lt;char&gt; <span class="kw">for </span>String {
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = char&gt;,
{
<span class="comment">// This is like `extend`, but `Vec&lt;char&gt;` is less efficient to deal
// with than `String`, so instead collect to `LinkedList&lt;String&gt;`.
</span><span class="kw">let </span>list = par_iter.into_par_iter().drive_unindexed(ListStringConsumer);
flat_string_extend(<span class="self">self</span>, list);
}
}
<span class="doccomment">/// Extends a string with copied characters from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>char&gt; <span class="kw">for </span>String {
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>char&gt;,
{
<span class="self">self</span>.par_extend(par_iter.into_par_iter().copied())
}
}
<span class="kw">struct </span>ListStringConsumer;
<span class="kw">struct </span>ListStringFolder {
string: String,
}
<span class="kw">impl </span>Consumer&lt;char&gt; <span class="kw">for </span>ListStringConsumer {
<span class="kw">type </span>Folder = ListStringFolder;
<span class="kw">type </span>Reducer = ListReducer;
<span class="kw">type </span><span class="prelude-ty">Result </span>= LinkedList&lt;String&gt;;
<span class="kw">fn </span>split_at(<span class="self">self</span>, _index: usize) -&gt; (<span class="self">Self</span>, <span class="self">Self</span>, <span class="self">Self</span>::Reducer) {
(<span class="self">Self</span>, <span class="self">Self</span>, ListReducer)
}
<span class="kw">fn </span>into_folder(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Folder {
ListStringFolder {
string: String::new(),
}
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="bool-val">false
</span>}
}
<span class="kw">impl </span>UnindexedConsumer&lt;char&gt; <span class="kw">for </span>ListStringConsumer {
<span class="kw">fn </span>split_off_left(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
<span class="self">Self
</span>}
<span class="kw">fn </span>to_reducer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span>::Reducer {
ListReducer
}
}
<span class="kw">impl </span>Folder&lt;char&gt; <span class="kw">for </span>ListStringFolder {
<span class="kw">type </span><span class="prelude-ty">Result </span>= LinkedList&lt;String&gt;;
<span class="kw">fn </span>consume(<span class="kw-2">mut </span><span class="self">self</span>, item: char) -&gt; <span class="self">Self </span>{
<span class="self">self</span>.string.push(item);
<span class="self">self
</span>}
<span class="kw">fn </span>consume_iter&lt;I&gt;(<span class="kw-2">mut </span><span class="self">self</span>, iter: I) -&gt; <span class="self">Self
</span><span class="kw">where
</span>I: IntoIterator&lt;Item = char&gt;,
{
<span class="self">self</span>.string.extend(iter);
<span class="self">self
</span>}
<span class="kw">fn </span>complete(<span class="self">self</span>) -&gt; <span class="self">Self</span>::Result {
<span class="kw">let </span><span class="kw-2">mut </span>list = LinkedList::new();
<span class="kw">if </span>!<span class="self">self</span>.string.is_empty() {
list.push_back(<span class="self">self</span>.string);
}
list
}
<span class="kw">fn </span>full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="bool-val">false
</span>}
}
<span class="kw">fn </span>string_extend&lt;Item&gt;(string: <span class="kw-2">&amp;mut </span>String, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>String: Extend&lt;Item&gt;,
Item: AsRef&lt;str&gt;,
{
<span class="kw">let </span>len = list.iter().flatten().map(Item::as_ref).map(str::len).sum();
string.reserve(len);
<span class="kw">for </span>vec <span class="kw">in </span>list {
string.extend(vec);
}
}
<span class="doccomment">/// Extends a string with string slices from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; <span class="kw">for </span>String {
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, string_extend);
}
}
<span class="doccomment">/// Extends a string with strings from a parallel iterator.
</span><span class="kw">impl </span>ParallelExtend&lt;String&gt; <span class="kw">for </span>String {
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = String&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, string_extend);
}
}
<span class="doccomment">/// Extends a string with string slices from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ParallelExtend&lt;Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt; <span class="kw">for </span>String {
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = Cow&lt;<span class="lifetime">&#39;a</span>, str&gt;&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, string_extend);
}
}
<span class="kw">fn </span>deque_extend&lt;T, Item&gt;(deque: <span class="kw-2">&amp;mut </span>VecDeque&lt;T&gt;, list: LinkedList&lt;Vec&lt;Item&gt;&gt;)
<span class="kw">where
</span>VecDeque&lt;T&gt;: Extend&lt;Item&gt;,
{
deque.reserve(len(<span class="kw-2">&amp;</span>list));
<span class="kw">for </span>vec <span class="kw">in </span>list {
deque.extend(vec);
}
}
<span class="doccomment">/// Extends a deque with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;T&gt; ParallelExtend&lt;T&gt; <span class="kw">for </span>VecDeque&lt;T&gt;
<span class="kw">where
</span>T: Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, deque_extend);
}
}
<span class="doccomment">/// Extends a deque with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt; <span class="kw">for </span>VecDeque&lt;T&gt;
<span class="kw">where
</span>T: <span class="lifetime">&#39;a </span>+ Copy + Send + Sync,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt;,
{
<span class="macro">extend!</span>(<span class="self">self</span>, par_iter, deque_extend);
}
}
<span class="kw">fn </span>vec_append&lt;T&gt;(vec: <span class="kw-2">&amp;mut </span>Vec&lt;T&gt;, list: LinkedList&lt;Vec&lt;T&gt;&gt;) {
vec.reserve(len(<span class="kw-2">&amp;</span>list));
<span class="kw">for </span><span class="kw-2">mut </span>other <span class="kw">in </span>list {
vec.append(<span class="kw-2">&amp;mut </span>other);
}
}
<span class="doccomment">/// Extends a vector with items from a parallel iterator.
</span><span class="kw">impl</span>&lt;T&gt; ParallelExtend&lt;T&gt; <span class="kw">for </span>Vec&lt;T&gt;
<span class="kw">where
</span>T: Send,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = T&gt;,
{
<span class="comment">// See the vec_collect benchmarks in rayon-demo for different strategies.
</span><span class="kw">let </span>par_iter = par_iter.into_par_iter();
<span class="kw">match </span>par_iter.opt_len() {
<span class="prelude-val">Some</span>(len) =&gt; {
<span class="comment">// When Rust gets specialization, we can get here for indexed iterators
// without relying on `opt_len`. Until then, `special_extend()` fakes
// an unindexed mode on the promise that `opt_len()` is accurate.
</span><span class="kw">super</span>::collect::special_extend(par_iter, len, <span class="self">self</span>);
}
<span class="prelude-val">None </span>=&gt; {
<span class="comment">// This works like `extend`, but `Vec::append` is more efficient.
</span><span class="kw">let </span>list = par_iter.drive_unindexed(ListVecConsumer);
vec_append(<span class="self">self</span>, list);
}
}
}
}
<span class="doccomment">/// Extends a vector with copied items from a parallel iterator.
</span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, T&gt; ParallelExtend&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt; <span class="kw">for </span>Vec&lt;T&gt;
<span class="kw">where
</span>T: <span class="lifetime">&#39;a </span>+ Copy + Send + Sync,
{
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>T&gt;,
{
<span class="self">self</span>.par_extend(par_iter.into_par_iter().copied())
}
}
<span class="doccomment">/// Collapses all unit items from a parallel iterator into one.
</span><span class="kw">impl </span>ParallelExtend&lt;()&gt; <span class="kw">for </span>() {
<span class="kw">fn </span>par_extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, par_iter: I)
<span class="kw">where
</span>I: IntoParallelIterator&lt;Item = ()&gt;,
{
par_iter.into_par_iter().drive_unindexed(NoopConsumer)
}
}
</code></pre></div>
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