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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="API documentation for the Rust `plumbing` mod in crate `rayon`."><meta name="keywords" content="rust, rustlang, rust-lang, plumbing"><title>rayon::iter::plumbing - Rust</title><link rel="stylesheet" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../rayon/index.html'><div class='logo-container'><img src='../../../rust-logo.png' alt='logo'></div></a><p class='location'>Module plumbing</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'><a href='../../index.html'>rayon</a>::<wbr><a href='../index.html'>iter</a></p><script>window.sidebarCurrent = {name: 'plumbing', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../../src/rayon/iter/plumbing/mod.rs.html#1-484' title='goto source code'>[src]</a></span><span class='in-band'>Module <a href='../../index.html'>rayon</a>::<wbr><a href='../index.html'>iter</a>::<wbr><a class="mod" href=''>plumbing</a></span></h1><div class='docblock'><p>Traits and functions used to implement parallel iteration. These are
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low-level details -- users of parallel iterators should not need to
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interact with them directly. See <a href="https://github.com/rayon-rs/rayon/blob/master/src/iter/plumbing/README.md">the <code>plumbing</code> README</a> for a high-level overview.</p>
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</div><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
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<table><tr class='module-item'><td><a class="trait" href="trait.Consumer.html" title='rayon::iter::plumbing::Consumer trait'>Consumer</a></td><td class='docblock-short'><p>A consumer is effectively a <a href="https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.fold">generalized "fold" operation</a>,
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and in fact each consumer will eventually be converted into a
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<a href="trait.Folder.html"><code>Folder</code></a>. What makes a consumer special is that, like a
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<a href="trait.Producer.html"><code>Producer</code></a>, it can be <strong>split</strong> into multiple consumers using
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the <code>split_at</code> method. When a consumer is split, it produces two
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consumers, as well as a <strong>reducer</strong>. The two consumers can be fed
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items independently, and when they are done the reducer is used to
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combine their two results into one. See <a href="https://github.com/rayon-rs/rayon/blob/master/src/iter/plumbing/README.md">the <code>plumbing</code>
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README</a> for further details.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Folder.html" title='rayon::iter::plumbing::Folder trait'>Folder</a></td><td class='docblock-short'><p>The <code>Folder</code> trait encapsulates <a href="https://doc.rust-lang.org/std/iter/trait.Iterator.html#method.fold">the standard fold
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operation</a>. It can be fed many items using the <code>consume</code>
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method. At the end, once all items have been consumed, it can then
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be converted (using <code>complete</code>) into a final value.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Producer.html" title='rayon::iter::plumbing::Producer trait'>Producer</a></td><td class='docblock-short'><p>A <code>Producer</code> is effectively a "splittable <code>IntoIterator</code>". That
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is, a producer is a value which can be converted into an iterator
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at any time: at that point, it simply produces items on demand,
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like any iterator. But what makes a <code>Producer</code> special is that,
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<em>before</em> we convert to an iterator, we can also <strong>split</strong> it at a
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particular point using the <code>split_at</code> method. This will yield up
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two producers, one producing the items before that point, and one
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producing the items after that point (these two producers can then
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independently be split further, or be converted into iterators).
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In Rayon, this splitting is used to divide between threads.
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See <a href="https://github.com/rayon-rs/rayon/blob/master/src/iter/plumbing/README.md">the <code>plumbing</code> README</a> for further details.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.ProducerCallback.html" title='rayon::iter::plumbing::ProducerCallback trait'>ProducerCallback</a></td><td class='docblock-short'><p>The <code>ProducerCallback</code> trait is a kind of generic closure,
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<a href="https://doc.rust-lang.org/std/ops/trait.FnOnce.html">analogous to <code>FnOnce</code></a>. See <a href="https://github.com/rayon-rs/rayon/blob/master/src/iter/plumbing/README.md#producer-callback">the corresponding section in
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the plumbing README</a> for more details.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Reducer.html" title='rayon::iter::plumbing::Reducer trait'>Reducer</a></td><td class='docblock-short'><p>The reducer is the final step of a <code>Consumer</code> -- after a consumer
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has been split into two parts, and each of those parts has been
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fully processed, we are left with two results. The reducer is then
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used to combine those two results into one. See <a href="https://github.com/rayon-rs/rayon/blob/master/src/iter/plumbing/README.md">the <code>plumbing</code>
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README</a> for further details.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.UnindexedConsumer.html" title='rayon::iter::plumbing::UnindexedConsumer trait'>UnindexedConsumer</a></td><td class='docblock-short'><p>A stateless consumer can be freely copied. These consumers can be
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used like regular consumers, but they also support a
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<code>split_off_left</code> method that does not take an index to split, but
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simply splits at some arbitrary point (<code>for_each</code>, for example,
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produces an unindexed consumer).</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.UnindexedProducer.html" title='rayon::iter::plumbing::UnindexedProducer trait'>UnindexedProducer</a></td><td class='docblock-short'><p>A variant on <code>Producer</code> which does not know its exact length or
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cannot represent it in a <code>usize</code>. These producers act like
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ordinary producers except that they cannot be told to split at a
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particular point. Instead, you just ask them to split 'somewhere'.</p>
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</td></tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
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<table><tr class='module-item'><td><a class="fn" href="fn.bridge.html" title='rayon::iter::plumbing::bridge fn'>bridge</a></td><td class='docblock-short'><p>This helper function is used to "connect" a parallel iterator to a
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consumer. It will convert the <code>par_iter</code> into a producer P and
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then pull items from P and feed them to <code>consumer</code>, splitting and
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creating parallel threads as needed.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.bridge_producer_consumer.html" title='rayon::iter::plumbing::bridge_producer_consumer fn'>bridge_producer_consumer</a></td><td class='docblock-short'><p>This helper function is used to "connect" a producer and a
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consumer. You may prefer to call <a href="fn.bridge.html"><code>bridge</code></a>, which wraps this
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function. This function will draw items from <code>producer</code> and feed
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them to <code>consumer</code>, splitting and creating parallel tasks when
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needed.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.bridge_unindexed.html" title='rayon::iter::plumbing::bridge_unindexed fn'>bridge_unindexed</a></td><td class='docblock-short'><p>A variant of <a href="fn.bridge_producer_consumer.html"><code>bridge_producer_consumer</code></a> where the producer is an unindexed producer.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "rayon";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script defer src="../../../search-index.js"></script></body></html>
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