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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 `Prior` trait in crate `brotli`."><title>Prior in brotli::enc::prior_eval - 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-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="brotli" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.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-a410ff4d.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 trait"><!--[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="#">Prior</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../../brotli/index.html">brotli</a><span class="version">8.0.2</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Prior</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.lookup_lin" title="lookup_lin">lookup_lin</a></li><li><a href="#tymethod.which" title="which">which</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.lookup" title="lookup">lookup</a></li><li><a href="#method.lookup_mut" title="lookup_mut">lookup_mut</a></li><li><a href="#method.score_index" title="score_index">score_index</a></li></ul><h3><a href="#dyn-compatibility">Dyn Compatibility</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2><a href="index.html">In brotli::<wbr>enc::<wbr>prior_<wbr>eval</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">brotli</a>::<wbr><a href="../index.html">enc</a>::<wbr><a href="index.html">prior_eval</a></div><h1>Trait <span class="trait">Prior</span>&nbsp;<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/brotli/enc/prior_eval.rs.html#35-84">Source</a> </span></div><pre class="rust item-decl"><code>pub trait Prior {
// Required methods
fn <a href="#tymethod.lookup_lin" class="fn">lookup_lin</a>(
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>;
<span class="item-spacer"></span> fn <a href="#tymethod.which" class="fn">which</a>() -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>;
// Provided methods
fn <a href="#method.lookup_mut" class="fn">lookup_mut</a>(
data: &amp;mut [<a class="type" href="../type.s16.html" title="type brotli::enc::s16">s16</a>],
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; <a class="struct" href="struct.CDF.html" title="struct brotli::enc::prior_eval::CDF">CDF</a>&lt;'_&gt; { ... }
<span class="item-spacer"></span> fn <a href="#method.lookup" class="fn">lookup</a>(
data: &amp;[<a class="type" href="../type.s16.html" title="type brotli::enc::s16">s16</a>],
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; &amp;<a class="type" href="../type.s16.html" title="type brotli::enc::s16">s16</a> { ... }
<span class="item-spacer"></span> fn <a href="#method.score_index" class="fn">score_index</a>(
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a> { ... }
}</code></pre><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><section id="tymethod.lookup_lin" class="method"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#36-41">Source</a><h4 class="code-header">fn <a href="#tymethod.lookup_lin" class="fn">lookup_lin</a>(
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a></h4></section><section id="tymethod.which" class="method"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#83">Source</a><h4 class="code-header">fn <a href="#tymethod.which" class="fn">which</a>() -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a></h4></section></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><section id="method.lookup_mut" class="method"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#43-52">Source</a><h4 class="code-header">fn <a href="#method.lookup_mut" class="fn">lookup_mut</a>(
data: &amp;mut [<a class="type" href="../type.s16.html" title="type brotli::enc::s16">s16</a>],
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; <a class="struct" href="struct.CDF.html" title="struct brotli::enc::prior_eval::CDF">CDF</a>&lt;'_&gt;</h4></section><section id="method.lookup" class="method"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#54-63">Source</a><h4 class="code-header">fn <a href="#method.lookup" class="fn">lookup</a>(
data: &amp;[<a class="type" href="../type.s16.html" title="type brotli::enc::s16">s16</a>],
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; &amp;<a class="type" href="../type.s16.html" title="type brotli::enc::s16">s16</a></h4></section><section id="method.score_index" class="method"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#66-82">Source</a><h4 class="code-header">fn <a href="#method.score_index" class="fn">score_index</a>(
stride_byte: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
selected_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>,
actual_context: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
high_nibble: <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>&gt;,
) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a></h4></section></div><h2 id="dyn-compatibility" class="section-header">Dyn Compatibility<a href="#dyn-compatibility" class="anchor">§</a></h2><div class="dyn-compatibility-info"><p>This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.93.1/reference/items/traits.html#dyn-compatibility">dyn compatible</a>.</p><p><i>In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.</i></p></div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-Prior-for-AdvPrior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#308-328">Source</a><a href="#impl-Prior-for-AdvPrior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.AdvPrior.html" title="struct brotli::enc::prior_eval::AdvPrior">AdvPrior</a></h3></section><section id="impl-Prior-for-CMPrior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#243-262">Source</a><a href="#impl-Prior-for-CMPrior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.CMPrior.html" title="struct brotli::enc::prior_eval::CMPrior">CMPrior</a></h3></section><section id="impl-Prior-for-FastCMPrior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#264-283">Source</a><a href="#impl-Prior-for-FastCMPrior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.FastCMPrior.html" title="struct brotli::enc::prior_eval::FastCMPrior">FastCMPrior</a></h3></section><section id="impl-Prior-for-SlowCMPrior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#286-305">Source</a><a href="#impl-Prior-for-SlowCMPrior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.SlowCMPrior.html" title="struct brotli::enc::prior_eval::SlowCMPrior">SlowCMPrior</a></h3></section><section id="impl-Prior-for-Stride1Prior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#124-138">Source</a><a href="#impl-Prior-for-Stride1Prior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.Stride1Prior.html" title="struct brotli::enc::prior_eval::Stride1Prior">Stride1Prior</a></h3></section><section id="impl-Prior-for-Stride2Prior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#150-164">Source</a><a href="#impl-Prior-for-Stride2Prior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.Stride2Prior.html" title="struct brotli::enc::prior_eval::Stride2Prior">Stride2Prior</a></h3></section><section id="impl-Prior-for-Stride3Prior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#176-190">Source</a><a href="#impl-Prior-for-Stride3Prior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.Stride3Prior.html" title="struct brotli::enc::prior_eval::Stride3Prior">Stride3Prior</a></h3></section><section id="impl-Prior-for-Stride4Prior" class="impl"><a class="src rightside" href="../../../src/brotli/enc/prior_eval.rs.html#202-216">Source</a><a href="#impl-Prior-for-Stride4Prior" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Prior.html" title="trait brotli::enc::prior_eval::Prior">Prior</a> for <a class="struct" href="struct.Stride4Prior.html" title="struct brotli::enc::prior_eval::Stride4Prior">Stride4Prior</a></h3></section></div><script src="../../../trait.impl/brotli/enc/prior_eval/trait.Prior.js" async></script></section></div></main></body></html>