<!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="API documentation for the Rust `take_hook` fn in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, take_hook"><title>std::panic::take_hook - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a 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class="content"><h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>std</a>::<wbr><a href='index.html'>panic</a>::<wbr><a class="fn" href=''>take_hook</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.10.0'>1.10.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../src/std/panicking.rs.html#152-168' title='goto source code'>[src]</a></span></h1><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><I></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><I></h3><code class="content"><span class="where fmt-newline">impl<I> <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>;</span><span class="where fmt-newline">impl<R: <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><R></span><span class="where fmt-newline">impl<W: <a class="trait" href="../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><W></span></code></div></div><pre class='rust fn'>pub fn take_hook() -> <a class="struct" href="../../std/boxed/struct.Box.html" title="struct std::boxed::Box">Box</a><<a class="trait" href="../../std/ops/trait.Fn.html" title="trait std::ops::Fn">Fn</a>(&<a class="struct" href="../../std/panic/struct.PanicInfo.html" title="struct std::panic::PanicInfo">PanicInfo</a>) + <a class="trait" href="../../std/marker/trait.Sync.html" title="trait std::marker::Sync">Sync</a> + <a class="trait" href="../../std/marker/trait.Send.html" title="trait std::marker::Send">Send</a> + 'static></pre><div class='docblock'><p>Unregisters the current panic hook, returning it.</p>
<p><em>See also the function <a href="./fn.set_hook.html"><code>set_hook</code></a>.</em></p>
<p>If no custom hook is registered, the default hook will be returned.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>Panics if called from a panicking thread.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>The following will print "Normal panic":</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">panic</span>;
<span class="ident">panic</span>::<span class="ident">set_hook</span>(<span class="ident">Box</span>::<span class="ident">new</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"Custom panic hook"</span>);
}));
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">panic</span>::<span class="ident">take_hook</span>();
<span class="macro">panic</span><span class="macro">!</span>(<span class="string">"Normal panic"</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Apanic%3B%0A%0Apanic%3A%3Aset_hook(Box%3A%3Anew(%7C_%7C%20%7B%0A%20%20%20%20println!(%22Custom%20panic%20hook%22)%3B%0A%7D))%3B%0A%0Alet%20_%20%3D%20panic%3A%3Atake_hook()%3B%0A%0Apanic!(%22Normal%20panic%22)%3B%0A%7D">Run</a></pre>
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