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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 trait for types that have variable length."><title>VarSize in read_fonts - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.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" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="read_fonts" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-6580c154.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]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../read_fonts/index.html">read_<wbr>fonts</a><span class="version">0.22.7</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">VarSize</a></h2><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Size" title="Size">Size</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 class="in-crate"><a href="index.html">In crate read_<wbr>fonts</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">read_fonts</a></span><h1>Trait <span class="trait">VarSize</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/read_fonts/read.rs.html#85-108">Source</a> </span></div><pre class="rust item-decl"><code>pub trait VarSize {
type <a href="#associatedtype.Size" class="associatedtype">Size</a>: <a class="trait" href="../font_types/raw/trait.Scalar.html" title="trait font_types::raw::Scalar">Scalar</a> + <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.u32.html">u32</a>&gt;;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A trait for types that have variable length.</p>
<p>As a rule, these types have an initial length field.</p>
<p>For types with a constant size, see <a href="../font_types/raw/trait.FixedSize.html" title="trait font_types::raw::FixedSize"><code>FixedSize</code></a> and
for types which can pre-compute their size, see <a href="trait.ComputeSize.html" title="trait read_fonts::ComputeSize"><code>ComputeSize</code></a>.</p>
</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Size" class="method"><a class="src rightside" href="../src/read_fonts/read.rs.html#90">Source</a><h4 class="code-header">type <a href="#associatedtype.Size" class="associatedtype">Size</a>: <a class="trait" href="../font_types/raw/trait.Scalar.html" title="trait font_types::raw::Scalar">Scalar</a> + <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.u32.html">u32</a>&gt;</h4></section></summary><div class="docblock"><p>The type of the first (length) field of the item.</p>
<p>When reading this type, we will read this value first, and use it to
determine the total length.</p>
</div></details></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/1.84.0/reference/items/traits.html#object-safety">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"><details class="toggle implementors-toggle"><summary><section id="impl-VarSize-for-PString%3C'_%3E" class="impl"><a class="src rightside" href="../src/read_fonts/tables/post.rs.html#85-87">Source</a><a href="#impl-VarSize-for-PString%3C'_%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.VarSize.html" title="trait read_fonts::VarSize">VarSize</a> for <a class="struct" href="tables/post/struct.PString.html" title="struct read_fonts::tables::post::PString">PString</a>&lt;'_&gt;</h3></section></summary><div class="impl-items"><section id="associatedtype.Size-1" class="associatedtype trait-impl"><a class="src rightside" href="../src/read_fonts/tables/post.rs.html#86">Source</a><a href="#associatedtype.Size-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Size" class="associatedtype">Size</a> = <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.u8.html">u8</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-VarSize-for-SegmentMaps%3C'a%3E" class="impl"><a class="src rightside" href="../src/read_fonts/tables/avar.rs.html#36-45">Source</a><a href="#impl-VarSize-for-SegmentMaps%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a&gt; <a class="trait" href="trait.VarSize.html" title="trait read_fonts::VarSize">VarSize</a> for <a class="struct" href="tables/avar/struct.SegmentMaps.html" title="struct read_fonts::tables::avar::SegmentMaps">SegmentMaps</a>&lt;'a&gt;</h3></section></summary><div class="impl-items"><section id="associatedtype.Size-2" class="associatedtype trait-impl"><a class="src rightside" href="../src/read_fonts/tables/avar.rs.html#37">Source</a><a href="#associatedtype.Size-2" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Size" class="associatedtype">Size</a> = <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.u16.html">u16</a></h4></section></div></details></div><script src="../trait.impl/read_fonts/read/trait.VarSize.js" async></script></section></div></main></body></html>