| <!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/hashbrown-0.12.3/src/scopeguard.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>scopeguard.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="../../hashbrown/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="../../hashbrown/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="comment">// Extracted from the scopeguard crate |
| </span><span class="kw">use </span>core::{ |
| mem, |
| ops::{Deref, DerefMut}, |
| ptr, |
| }; |
| |
| <span class="kw">pub struct </span>ScopeGuard<T, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T), |
| { |
| dropfn: F, |
| value: T, |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>guard<T, F>(value: T, dropfn: F) -> ScopeGuard<T, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T), |
| { |
| ScopeGuard { dropfn, value } |
| } |
| |
| <span class="kw">impl</span><T, F> ScopeGuard<T, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T), |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>into_inner(guard: <span class="self">Self</span>) -> T { |
| <span class="comment">// Cannot move out of Drop-implementing types, so |
| // ptr::read the value and forget the guard. |
| </span><span class="kw">unsafe </span>{ |
| <span class="kw">let </span>value = ptr::read(<span class="kw-2">&</span>guard.value); |
| <span class="comment">// read the closure so that it is dropped, and assign it to a local |
| // variable to ensure that it is only dropped after the guard has |
| // been forgotten. (In case the Drop impl of the closure, or that |
| // of any consumed captured variable, panics). |
| </span><span class="kw">let </span>_dropfn = ptr::read(<span class="kw-2">&</span>guard.dropfn); |
| mem::forget(guard); |
| value |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><T, F> Deref <span class="kw">for </span>ScopeGuard<T, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T), |
| { |
| <span class="kw">type </span>Target = T; |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>T { |
| <span class="kw-2">&</span><span class="self">self</span>.value |
| } |
| } |
| |
| <span class="kw">impl</span><T, F> DerefMut <span class="kw">for </span>ScopeGuard<T, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T), |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span>T { |
| <span class="kw-2">&mut </span><span class="self">self</span>.value |
| } |
| } |
| |
| <span class="kw">impl</span><T, F> Drop <span class="kw">for </span>ScopeGuard<T, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&mut </span>T), |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| (<span class="self">self</span>.dropfn)(<span class="kw-2">&mut </span><span class="self">self</span>.value); |
| } |
| } |
| </code></pre></div> |
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