| <!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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/memchr-2.5.0/src/cow.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>cow.rs - source</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" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../memchr/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../memchr/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><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="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>core::ops; |
| |
| <span class="doccomment">/// A specialized copy-on-write byte string. |
| /// |
| /// The purpose of this type is to permit usage of a "borrowed or owned |
| /// byte string" in a way that keeps std/no-std compatibility. That is, in |
| /// no-std mode, this type devolves into a simple &[u8] with no owned variant |
| /// available. We can't just use a plain Cow because Cow is not in core. |
| </span><span class="attribute">#[derive(Clone, Debug)] |
| </span><span class="kw">pub struct </span>CowBytes<<span class="lifetime">'a</span>>(Imp<<span class="lifetime">'a</span>>); |
| |
| <span class="comment">// N.B. We don't use std::borrow::Cow here since we can get away with a |
| // Box<[u8]> for our use case, which is 1/3 smaller than the Vec<u8> that |
| // a Cow<[u8]> would use. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[derive(Clone, Debug)] |
| </span><span class="kw">enum </span>Imp<<span class="lifetime">'a</span>> { |
| Borrowed(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]), |
| Owned(Box<[u8]>), |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| #[derive(Clone, Debug)] |
| </span><span class="kw">struct </span>Imp<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> ops::Deref <span class="kw">for </span>CowBytes<<span class="lifetime">'a</span>> { |
| <span class="kw">type </span>Target = [u8]; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="self">self</span>.as_slice() |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> CowBytes<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Create a new borrowed CowBytes. |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>new<B: <span class="question-mark">?</span>Sized + AsRef<[u8]>>(bytes: <span class="kw-2">&</span><span class="lifetime">'a </span>B) -> CowBytes<<span class="lifetime">'a</span>> { |
| CowBytes(Imp::new(bytes.as_ref())) |
| } |
| |
| <span class="doccomment">/// Create a new owned CowBytes. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>new_owned(bytes: Box<[u8]>) -> CowBytes<<span class="lifetime">'static</span>> { |
| CowBytes(Imp::Owned(bytes)) |
| } |
| |
| <span class="doccomment">/// Return a borrowed byte string, regardless of whether this is an owned |
| /// or borrowed byte string internally. |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="self">self</span>.<span class="number">0</span>.as_slice() |
| } |
| |
| <span class="doccomment">/// Return an owned version of this copy-on-write byte string. |
| /// |
| /// If this is already an owned byte string internally, then this is a |
| /// no-op. Otherwise, the internal byte string is copied. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>into_owned(<span class="self">self</span>) -> CowBytes<<span class="lifetime">'static</span>> { |
| <span class="kw">match </span><span class="self">self</span>.<span class="number">0 </span>{ |
| Imp::Borrowed(b) => CowBytes::new_owned(Box::from(b)), |
| Imp::Owned(b) => CowBytes::new_owned(b), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Imp<<span class="lifetime">'a</span>> { |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>new(bytes: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> Imp<<span class="lifetime">'a</span>> { |
| Imp::Borrowed(bytes) |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>new(bytes: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> Imp<<span class="lifetime">'a</span>> { |
| Imp(bytes) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Imp::Owned(<span class="kw-2">ref </span>x) => x, |
| Imp::Borrowed(x) => x, |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| </code></pre></div> |
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