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<!doctype html><html lang=en><head><title>Box Is a Unique Type :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="About better aliasing semantics for `Box`"><meta name=keywords content="box,noalias"><meta name=robots content="noodp"><link rel=canonical href=/posts/box-is-a-unique-type/><link rel=stylesheet href=/assets/style.css><link rel=apple-touch-icon href=/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="article"><meta property="og:title" content="Box Is a Unique Type"><meta property="og:description" content="About better aliasing semantics for `Box`"><meta property="og:url" content="/posts/box-is-a-unique-type/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2022-07-22 00:00:00 +0000 UTC"></head><body class=orange><div class="container center headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>nilstriebs blog</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=/posts/box-is-a-unique-type/>Box Is a Unique Type</a></h1><div class=post-meta><span class=post-date>2022-07-22</span>
<span class=post-author>:: Nilstrieb</span>
<span class=post-reading-time>:: 12 min read (2351 words)</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
<span class=post-reading-time>:: 12 min read (2370 words)</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content><div><p>We have all used <code>Box&lt;T></code> before in our Rust code. It&rsquo;s a glorious type, with great ergonomics
and flexibitility. We can use it to put our values on the heap, but it can do even more
than that!</p><div class=highlight><pre tabindex=0 style=color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4><code class=language-rust data-lang=rust><span style=display:flex><span><span style=color:#66d9ef>struct</span> <span style=color:#a6e22e>Fields</span> {
@ -129,6 +129,6 @@ are very strong, and still giving code an option to obtain these seems useful. O
<code>&'static mut T</code> that is unleaked for drop, but the semantics of this are still <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/316>unclear</a>.
If that is not possible, exposing <code>std::ptr::Unique</code> (with it getting boxes aliasing semantics) could be desirable. For this, all existing usages of <code>Unique</code>
inside the standard library would have to be removed. We could also offer a <code>std::boxed::UniqueBox</code> that keeps the current semantics, but this would also bring direct aliasing
decisions more towards safe code, which I am not a huge fan of. Ownership is enough already.</p><p>I guess what I am wishing for are some good and flexible raw pointer types. But that&rsquo;s still in the stars&mldr;</p><p>For more information about this topic, see <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/326>https://github.com/rust-lang/unsafe-code-guidelines/issues/326</a></p></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2022 Powered by <a href=http://gohugo.io>Hugo</a></span>
decisions more towards safe code, which I am not a huge fan of. Ownership is enough already.</p><p>I guess what I am wishing for are some good and flexible raw pointer types. But that&rsquo;s still in the stars&mldr;</p><p>For more information about this topic, see <a href=https://github.com/rust-lang/unsafe-code-guidelines/issues/326>https://github.com/rust-lang/unsafe-code-guidelines/issues/326</a></p><p><em>Thanks to the nice people on the Rust Community Discord for their feedback on the draft of this post!</em></p></div></div></div></div><footer class=footer><div class=footer__inner><div class=copyright><span>© 2022 Powered by <a href=http://gohugo.io>Hugo</a></span>
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posts/index.xml
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@ -170,4 +170,5 @@ If that is not possible, exposing &lt;code>std::ptr::Unique&lt;/code> (with it g
inside the standard library would have to be removed. We could also offer a &lt;code>std::boxed::UniqueBox&lt;/code> that keeps the current semantics, but this would also bring direct aliasing
decisions more towards safe code, which I am not a huge fan of. Ownership is enough already.&lt;/p>
&lt;p>I guess what I am wishing for are some good and flexible raw pointer types. But that&amp;rsquo;s still in the stars&amp;hellip;&lt;/p>
&lt;p>For more information about this topic, see &lt;a href="https://github.com/rust-lang/unsafe-code-guidelines/issues/326">https://github.com/rust-lang/unsafe-code-guidelines/issues/326&lt;/a>&lt;/p></content></item></channel></rss>
&lt;p>For more information about this topic, see &lt;a href="https://github.com/rust-lang/unsafe-code-guidelines/issues/326">https://github.com/rust-lang/unsafe-code-guidelines/issues/326&lt;/a>&lt;/p>
&lt;p>&lt;em>Thanks to the nice people on the Rust Community Discord for their feedback on the draft of this post!&lt;/em>&lt;/p></content></item></channel></rss>