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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="An integer that can be written into an `itoa::Buffer`."><title>Integer in itoa - 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="itoa" 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="#">Integer</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../itoa/index.html">itoa</a><span class="version">1.0.17</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Integer</a></h2><h3><a href="#required-associated-consts">Required Associated Constants</a></h3><ul class="block"><li><a href="#associatedconstant.MAX_STR_LEN" title="MAX_STR_LEN">MAX_STR_LEN</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Integer-for-i8" title="i8">i8</a></li><li><a href="#impl-Integer-for-i16" title="i16">i16</a></li><li><a href="#impl-Integer-for-i32" title="i32">i32</a></li><li><a href="#impl-Integer-for-i64" title="i64">i64</a></li><li><a href="#impl-Integer-for-i128" title="i128">i128</a></li><li><a href="#impl-Integer-for-isize" title="isize">isize</a></li><li><a href="#impl-Integer-for-u8" title="u8">u8</a></li><li><a href="#impl-Integer-for-u16" title="u16">u16</a></li><li><a href="#impl-Integer-for-u32" title="u32">u32</a></li><li><a href="#impl-Integer-for-u64" title="u64">u64</a></li><li><a href="#impl-Integer-for-u128" title="u128">u128</a></li><li><a href="#impl-Integer-for-usize" title="usize">usize</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 itoa</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">itoa</a></div><h1>Trait <span class="trait">Integer</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/itoa/lib.rs.html#121-125">Source</a> </span></div><pre class="rust item-decl"><code>pub trait Integer: Sealed {
const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>An integer that can be written into an <a href="struct.Buffer.html" title="struct itoa::Buffer"><code>itoa::Buffer</code></a>.</p>
<p>This trait is sealed and cannot be implemented for types outside of itoa.</p>
</div></details><h2 id="required-associated-consts" class="section-header">Required Associated Constants<a href="#required-associated-consts" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedconstant.MAX_STR_LEN" class="method"><a class="src rightside" href="../src/itoa/lib.rs.html#124">Source</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>The maximum length of string that formatting an integer of this type can
produce on the current target platform.</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/1.93.1/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="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-i8" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#187">Source</a><a href="#impl-Integer-for-i8" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.i8.html">i8</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-1" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#187">Source</a><a href="#associatedconstant.MAX_STR_LEN-1" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-i16" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#188">Source</a><a href="#impl-Integer-for-i16" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.i16.html">i16</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-2" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#188">Source</a><a href="#associatedconstant.MAX_STR_LEN-2" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-i32" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#189">Source</a><a href="#impl-Integer-for-i32" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.i32.html">i32</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-3" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#189">Source</a><a href="#associatedconstant.MAX_STR_LEN-3" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-i64" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#190">Source</a><a href="#impl-Integer-for-i64" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.i64.html">i64</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-4" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#190">Source</a><a href="#associatedconstant.MAX_STR_LEN-4" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-i128" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#191">Source</a><a href="#impl-Integer-for-i128" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.i128.html">i128</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-5" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#191">Source</a><a href="#associatedconstant.MAX_STR_LEN-5" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-isize" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#217">Source</a><a href="#impl-Integer-for-isize" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.isize.html">isize</a></h3><span class="item-info"><div class="stab portability">Available on <strong>64-bit</strong> only.</div></span></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-6" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#217">Source</a><a href="#associatedconstant.MAX_STR_LEN-6" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a> = &lt;i64 as Integer&gt;::MAX_STR_LEN</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-u8" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#187">Source</a><a href="#impl-Integer-for-u8" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.u8.html">u8</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-7" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#187">Source</a><a href="#associatedconstant.MAX_STR_LEN-7" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-u16" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#188">Source</a><a href="#impl-Integer-for-u16" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.u16.html">u16</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-8" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#188">Source</a><a href="#associatedconstant.MAX_STR_LEN-8" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-u32" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#189">Source</a><a href="#impl-Integer-for-u32" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.u32.html">u32</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-9" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#189">Source</a><a href="#associatedconstant.MAX_STR_LEN-9" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-u64" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#190">Source</a><a href="#impl-Integer-for-u64" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.u64.html">u64</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-10" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#190">Source</a><a href="#associatedconstant.MAX_STR_LEN-10" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-u128" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#191">Source</a><a href="#impl-Integer-for-u128" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.u128.html">u128</a></h3></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-11" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#191">Source</a><a href="#associatedconstant.MAX_STR_LEN-11" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Integer-for-usize" class="impl"><a class="src rightside" href="../src/itoa/lib.rs.html#218">Source</a><a href="#impl-Integer-for-usize" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Integer.html" title="trait itoa::Integer">Integer</a> for <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a></h3><span class="item-info"><div class="stab portability">Available on <strong>64-bit</strong> only.</div></span></section></summary><div class="impl-items"><section id="associatedconstant.MAX_STR_LEN-12" class="associatedconstant trait-impl"><a class="src rightside" href="../src/itoa/lib.rs.html#218">Source</a><a href="#associatedconstant.MAX_STR_LEN-12" class="anchor">§</a><h4 class="code-header">const <a href="#associatedconstant.MAX_STR_LEN" class="constant">MAX_STR_LEN</a>: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/core/primitive.usize.html">usize</a> = &lt;u64 as Integer&gt;::MAX_STR_LEN</h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/itoa/trait.Integer.js" data-ignore-extern-crates="core" 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