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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="API documentation for the Rust `from_raw_parts` fn in crate `core`."><meta name="keywords" content="rust, rustlang, rust-lang, from_raw_parts"><title>core::slice::from_raw_parts - 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">&#9776;</div><a href='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>slice</a></p><script>window.sidebarCurrent = {name: 'from_raw_parts', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>core</a>::<wbr><a href='index.html'>slice</a>::<wbr><a class="fn" href=''>from_raw_parts</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../../src/core/slice/mod.rs.html#3906-3908' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub unsafe fn from_raw_parts&lt;'a, T&gt;(data: *const T, len: usize) -&gt; &amp;'a [T]</pre><div class='docblock'><p>Forms a slice from a pointer and a length.</p>
<p>The <code>len</code> argument is the number of <strong>elements</strong>, not the number of bytes.</p>
<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
<p>This function is unsafe as there is no guarantee that the given pointer is
valid for <code>len</code> elements, nor whether the lifetime inferred is a suitable
lifetime for the returned slice.</p>
<p><code>data</code> must be non-null and aligned, even for zero-length slices. One
reason for this is that enum layout optimizations may rely on references
(including slices of any length) being aligned and non-null to distinguish
them from other data. You can obtain a pointer that is usable as <code>data</code>
for zero-length slices using <a href="../../std/ptr/struct.NonNull.html#method.dangling"><code>NonNull::dangling()</code></a>.</p>
<h1 id="caveat" class="section-header"><a href="#caveat">Caveat</a></h1>
<p>The lifetime for the returned slice is inferred from its usage. To
prevent accidental misuse, it's suggested to tie the lifetime to whichever
source lifetime is safe in the context, such as by providing a helper
function taking the lifetime of a host value for the slice, or by explicit
annotation.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">slice</span>;

<span class="comment">// manifest a slice out of thin air!</span>
<span class="kw">let</span> <span class="ident">ptr</span> <span class="op">=</span> <span class="number">0x1234</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">usize</span>;
<span class="kw">let</span> <span class="ident">amt</span> <span class="op">=</span> <span class="number">10</span>;
<span class="kw">unsafe</span> {
    <span class="kw">let</span> <span class="ident">slice</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts</span>(<span class="ident">ptr</span>, <span class="ident">amt</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%3Aslice%3B%0A%0A%2F%2F%20manifest%20a%20slice%20out%20of%20thin%20air!%0Alet%20ptr%20%3D%200x1234%20as%20*const%20usize%3B%0Alet%20amt%20%3D%2010%3B%0Aunsafe%20%7B%0A%20%20%20%20let%20slice%20%3D%20slice%3A%3Afrom_raw_parts(ptr%2C%20amt)%3B%0A%7D%0A%7D">Run</a></pre>
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