| <!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="Takes a parser which parses a `length` then extracts a range of that length and returns it. Commonly used in binary formats"><meta name="keywords" content="rust, rustlang, rust-lang, length_prefix"><title>length_prefix in combine::parser::range - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" 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class="sidebar"><a class="sidebar-logo" href="../../../combine/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In combine::parser::range</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Function <a href="../../index.html">combine</a>::<wbr><a href="../index.html">parser</a>::<wbr><a href="index.html">range</a>::<wbr><a class="fn" href="#">length_prefix</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../../src/combine/parser/range.rs.html#670-702">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust fn"><code>pub fn length_prefix<Input, P>(len: P) -> length_prefix<Input, P><span class="where fmt-newline">where<br> <Input as <a class="trait" href="../../trait.StreamOnce.html" title="trait combine::StreamOnce">StreamOnce</a>>::<a class="associatedtype" href="../../trait.StreamOnce.html#associatedtype.Error" title="type combine::StreamOnce::Error">Error</a>: <a class="trait" href="../../trait.ParseError.html" title="trait combine::ParseError">ParseError</a><<Input as <a class="trait" href="../../trait.StreamOnce.html" title="trait combine::StreamOnce">StreamOnce</a>>::<a class="associatedtype" href="../../trait.StreamOnce.html#associatedtype.Token" title="type combine::StreamOnce::Token">Token</a>, <Input as <a class="trait" href="../../trait.StreamOnce.html" title="trait combine::StreamOnce">StreamOnce</a>>::<a class="associatedtype" href="../../trait.StreamOnce.html#associatedtype.Range" title="type combine::StreamOnce::Range">Range</a>, <Input as <a class="trait" href="../../trait.StreamOnce.html" title="trait combine::StreamOnce">StreamOnce</a>>::<a class="associatedtype" href="../../trait.StreamOnce.html#associatedtype.Position" title="type combine::StreamOnce::Position">Position</a>>,<br> Input: <a class="trait" href="../../trait.Stream.html" title="trait combine::Stream">Stream</a>,<br> Input: <a class="trait" href="../../trait.RangeStream.html" title="trait combine::RangeStream">RangeStream</a>,<br> P: <a class="trait" href="../../trait.Parser.html" title="trait combine::Parser">Parser</a><Input>,<br> usize: TryFrom<P::<a class="associatedtype" href="../../trait.Parser.html#associatedtype.Output" title="type combine::Parser::Output">Output</a>>,<br> <usize as TryFrom<P::<a class="associatedtype" href="../../trait.Parser.html#associatedtype.Output" title="type combine::Parser::Output">Output</a>>>::Error: Display + Send + Sync + 'static,</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Takes a parser which parses a <code>length</code> then extracts a range of that length and returns it. |
| Commonly used in binary formats</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>input = Vec::new(); |
| input.extend_from_slice(<span class="kw-2">&</span><span class="number">3u16</span>.to_be_bytes()); |
| input.extend_from_slice(<span class="string">b"1234"</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>parser = length_prefix(be_u16()); |
| <span class="kw">let </span>result = parser.parse(<span class="kw-2">&</span>input[..]); |
| <span class="macro">assert_eq!</span>(result, <span class="prelude-val">Ok</span>((<span class="kw-2">&</span><span class="string">b"123"</span>[..], <span class="kw-2">&</span><span class="string">b"4"</span>[..])));</code></pre></div> |
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