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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="A “history buffer”, similar to a write-only ring buffer of fixed length."><title>heapless::history_buf - Rust</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"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-e56847b5.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="heapless" data-themes="" data-resource-suffix="" data-rustdoc-version="1.91.1 (ed61e7d7e 2025-11-07)" data-channel="1.91.1" data-search-js="search-e256b49e.js" data-stringdex-js="stringdex-c3e638e9.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-6dc2a7f3.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">Module history_buf</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../heapless/index.html">heapless</a><span class="version">0.9.2</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module history_<wbr>buf</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#traits" title="Traits">Traits</a></li><li><a href="#types" title="Type Aliases">Type Aliases</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate heapless</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">heapless</a></div><h1>Module <span>history_<wbr>buf</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/heapless/history_buf.rs.html#1-992">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A “history buffer”, similar to a write-only ring buffer of fixed length.</p>
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<p>This buffer keeps a fixed number of elements. On write, the oldest element
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is overwritten. Thus, the buffer is useful to keep a history of values with
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some desired depth, and for example calculate a rolling average.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>heapless::HistoryBuf;
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<span class="comment">// Initialize a new buffer with 8 elements.
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</span><span class="kw">let </span><span class="kw-2">mut </span>buf = HistoryBuf::<<span class="kw">_</span>, <span class="number">8</span>>::new();
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<span class="comment">// Starts with no data
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</span><span class="macro">assert_eq!</span>(buf.recent(), <span class="prelude-val">None</span>);
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buf.write(<span class="number">3</span>);
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buf.write(<span class="number">5</span>);
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buf.extend(<span class="kw-2">&</span>[<span class="number">4</span>, <span class="number">4</span>]);
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<span class="comment">// The most recent written element is a four.
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</span><span class="macro">assert_eq!</span>(buf.recent(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">4</span>));
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<span class="comment">// To access all elements in an unspecified order, use `as_slice()`.
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</span><span class="kw">for </span>el <span class="kw">in </span>buf.as_slice() {
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<span class="macro">println!</span>(<span class="string">"{:?}"</span>, el);
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}
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<span class="comment">// Now we can prepare an average of all values, which comes out to 4.
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</span><span class="kw">let </span>avg = buf.as_slice().iter().sum::<usize>() / buf.len();
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<span class="macro">assert_eq!</span>(avg, <span class="number">4</span>);</code></pre></div></div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.HistoryBufInner.html" title="struct heapless::history_buf::HistoryBufInner">History<wbr>BufInner</a></dt><dd>Base struct for <a href="type.HistoryBuf.html" title="type heapless::history_buf::HistoryBuf"><code>HistoryBuf</code></a> and <a href="type.HistoryBufView.html" title="type heapless::history_buf::HistoryBufView"><code>HistoryBufView</code></a>, generic over the <a href="trait.HistoryBufStorage.html" title="trait heapless::history_buf::HistoryBufStorage"><code>HistoryBufStorage</code></a>.</dd><dt><a class="struct" href="struct.OldestOrdered.html" title="struct heapless::history_buf::OldestOrdered">Oldest<wbr>Ordered</a></dt><dd>Double ended iterator on the underlying buffer ordered from the oldest data
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to the newest.</dd></dl><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><dl class="item-table"><dt><a class="trait" href="trait.HistoryBufStorage.html" title="trait heapless::history_buf::HistoryBufStorage">History<wbr>BufStorage</a></dt><dd>Trait defining how data for a container is stored.</dd></dl><h2 id="types" class="section-header">Type Aliases<a href="#types" class="anchor">§</a></h2><dl class="item-table"><dt><a class="type" href="type.HistoryBuf.html" title="type heapless::history_buf::HistoryBuf">History<wbr>Buf</a></dt><dd>A “history buffer”, similar to a write-only ring buffer of fixed length.</dd><dt><a class="type" href="type.HistoryBufView.html" title="type heapless::history_buf::HistoryBufView">History<wbr>BufView</a></dt><dd>A “view” into a <a href="type.HistoryBuf.html" title="type heapless::history_buf::HistoryBuf"><code>HistoryBuf</code></a></dd><dt><a class="type" href="type.OwnedHistoryBufStorage.html" title="type heapless::history_buf::OwnedHistoryBufStorage">Owned<wbr>History<wbr>BufStorage</a></dt><dd>Implementation of <a href="trait.HistoryBufStorage.html" title="trait heapless::history_buf::HistoryBufStorage"><code>HistoryBufStorage</code></a> that stores the data in an array <code>[T; N]</code> whose size
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is known at compile time.</dd><dt><a class="type" href="type.ViewHistoryBufStorage.html" title="type heapless::history_buf::ViewHistoryBufStorage">View<wbr>History<wbr>BufStorage</a></dt><dd>Implementation of <a href="trait.HistoryBufStorage.html" title="trait heapless::history_buf::HistoryBufStorage"><code>HistoryBufStorage</code></a> that stores the data in an unsized <code>[T]</code>.</dd></dl></section></div></main></body></html> |