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<!doctype html><html lang=en><head><meta name=generator content="Hugo 0.101.0"><title>nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=http://nilstrieb.github.io/><link rel=stylesheet href=http://nilstrieb.github.io/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.css><link rel=apple-touch-icon href=http://nilstrieb.github.io/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=http://nilstrieb.github.io/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="nilstriebs blog"><meta property="og:description" content><meta property="og:url" content="http://nilstrieb.github.io/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=http://nilstrieb.github.io/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=http://nilstrieb.github.io/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> <!doctype html><html lang=en><head><meta name=generator content="Hugo 0.101.0"><title>nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/><link rel=stylesheet href=/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.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="website"><meta property="og:title" content="nilstriebs blog"><meta property="og:description" content><meta property="og:url" content="/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><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></div><span class=post-tags>#<a href=http://nilstrieb.github.io/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=http://nilstrieb.github.io/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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> #<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>nilstriebs blog</title><link>http://nilstrieb.github.io/</link><description>Recent content on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="http://nilstrieb.github.io/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>http://nilstrieb.github.io/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>http://nilstrieb.github.io/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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! <?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>nilstriebs blog</title><link>/</link><description>Recent content on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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!
struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;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 and flexibitility. We can use it to put our values on the heap, but it can do even more
than that!&lt;/p> than that!&lt;/p>

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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="The current and future aliasing semantics of Box"><meta name=keywords content="box,noalias"><meta name=robots content="noodp"><link rel=canonical href=http://nilstrieb.github.io/posts/box-is-a-unique-type/><link rel=stylesheet href=http://nilstrieb.github.io/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.css><link rel=apple-touch-icon href=http://nilstrieb.github.io/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=http://nilstrieb.github.io/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="The current and future aliasing semantics of Box"><meta property="og:url" content="http://nilstrieb.github.io/posts/box-is-a-unique-type/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="http://nilstrieb.github.io/"><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><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=http://nilstrieb.github.io/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=post><h1 class=post-title><a href=http://nilstrieb.github.io/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> <!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="The current and future aliasing semantics of 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=stylesheet href=assets/%25!s%28%3cnil%3e%29.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="The current and future aliasing semantics of 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><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>Terminal</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-author>:: Nilstrieb</span>
<span class=post-reading-time>:: 10 min read (2052 words)</span></div><span class=post-tags>#<a href=http://nilstrieb.github.io/tags/rust/>rust</a>&nbsp; <span class=post-reading-time>:: 10 min read (2052 words)</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=http://nilstrieb.github.io/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 #<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 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> { 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> {
</span></span><span style=display:flex><span> a: String, </span></span><span style=display:flex><span> a: String,
@ -117,5 +117,5 @@ against the current box behaviour. Unsafe code wants to use box, and it is reaso
remove all uniqueness from <code>Box&lt;T></code>, and treat it just like a <code>*const T</code> for the purposes of aliasing. This will make it more remove all uniqueness from <code>Box&lt;T></code>, and treat it just like a <code>*const T</code> for the purposes of aliasing. This will make it more
predictable for unsafe code, and comes at none or only a minor performance cost.</p><p>But this performance cost may be real, and especially the future optimization value can&rsquo;t be certain. I do think that there predictable for unsafe code, and comes at none or only a minor performance cost.</p><p>But this performance cost may be real, and especially the future optimization value can&rsquo;t be certain. I do think that there
should be a way to get the uniqueness guarantees in some other way than through box. One possibility would be to use a <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, maybe 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 though.</p><p>I guess what I am wishing for are some good and flexible raw pointer types. 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> should be a way to get the uniqueness guarantees in some other way than through box. One possibility would be to use a <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, maybe 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 though.</p><p>I guess what I am wishing for are some good and flexible raw pointer types. 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>
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<!doctype html><html lang=en><head><title>Posts :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=http://nilstrieb.github.io/posts/><link rel=stylesheet href=http://nilstrieb.github.io/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.css><link rel=apple-touch-icon href=http://nilstrieb.github.io/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=http://nilstrieb.github.io/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="http://nilstrieb.github.io/posts/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/posts/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=http://nilstrieb.github.io/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=http://nilstrieb.github.io/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> <!doctype html><html lang=en><head><title>Posts :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/posts/><link rel=stylesheet href=/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.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="website"><meta property="og:title" content="Posts"><meta property="og:description" content><meta property="og:url" content="/posts/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/posts/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><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></div><span class=post-tags>#<a href=http://nilstrieb.github.io/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=http://nilstrieb.github.io/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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> #<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on nilstriebs blog</title><link>http://nilstrieb.github.io/posts/</link><description>Recent content in Posts on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="http://nilstrieb.github.io/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>http://nilstrieb.github.io/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>http://nilstrieb.github.io/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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! <?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Posts on nilstriebs blog</title><link>/posts/</link><description>Recent content in Posts on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="/posts/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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!
struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;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 and flexibitility. We can use it to put our values on the heap, but it can do even more
than that!&lt;/p> than that!&lt;/p>

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<!doctype html><html lang=en><head><title>rust :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=http://nilstrieb.github.io/tags/rust/><link rel=stylesheet href=http://nilstrieb.github.io/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.css><link rel=apple-touch-icon href=http://nilstrieb.github.io/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=http://nilstrieb.github.io/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="rust"><meta property="og:description" content><meta property="og:url" content="http://nilstrieb.github.io/tags/rust/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/rust/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=http://nilstrieb.github.io/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=http://nilstrieb.github.io/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> <!doctype html><html lang=en><head><title>rust :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/rust/><link rel=stylesheet href=/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.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="website"><meta property="og:title" content="rust"><meta property="og:description" content><meta property="og:url" content="/tags/rust/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/rust/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><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></div><span class=post-tags>#<a href=http://nilstrieb.github.io/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=http://nilstrieb.github.io/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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> #<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>rust on nilstriebs blog</title><link>http://nilstrieb.github.io/tags/rust/</link><description>Recent content in rust on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="http://nilstrieb.github.io/tags/rust/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>http://nilstrieb.github.io/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>http://nilstrieb.github.io/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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! <?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>rust on nilstriebs blog</title><link>/tags/rust/</link><description>Recent content in rust on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="/tags/rust/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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!
struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;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 and flexibitility. We can use it to put our values on the heap, but it can do even more
than that!&lt;/p> than that!&lt;/p>

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<!doctype html><html lang=en><head><title>unsafe code :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=http://nilstrieb.github.io/tags/unsafe-code/><link rel=stylesheet href=http://nilstrieb.github.io/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.css><link rel=apple-touch-icon href=http://nilstrieb.github.io/img/apple-touch-icon-192x192.png><link rel="shortcut icon" href=http://nilstrieb.github.io/img/favicon/orange.png><meta name=twitter:card content="summary"><meta property="og:locale" content="en"><meta property="og:type" content="website"><meta property="og:title" content="unsafe code"><meta property="og:description" content><meta property="og:url" content="http://nilstrieb.github.io/tags/unsafe-code/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/unsafe-code/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=http://nilstrieb.github.io/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><h1 class=post-title><a href=http://nilstrieb.github.io/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> <!doctype html><html lang=en><head><title>unsafe code :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content><meta name=keywords content><meta name=robots content="noodp"><link rel=canonical href=/tags/unsafe-code/><link rel=stylesheet href=/assets/style.css><link rel=stylesheet href=assets/%25!s%28%3cnil%3e%29.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="website"><meta property="og:title" content="unsafe code"><meta property="og:description" content><meta property="og:url" content="/tags/unsafe-code/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="img/favicon/%!s().png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><link href=/tags/unsafe-code/index.xml rel=alternate type=application/rss+xml title="nilstriebs blog"></head><body><div class="container headings--one-size"><header class=header><div class=header__inner><div class=header__logo><a href=/><div class=logo>Terminal</div></a></div></div></header><div class=content><div class=posts><div class="post on-list"><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></div><span class=post-tags>#<a href=http://nilstrieb.github.io/tags/rust/>rust</a>&nbsp; <span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=http://nilstrieb.github.io/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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> #<a href=/tags/unsafe-code/>unsafe code</a>&nbsp;</span><div class=post-content>The current and future aliasing semantics of Box</div><div><a class="read-more button" href=/posts/box-is-a-unique-type/>→</a></div></div><div class=pagination><div class=pagination__buttons></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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<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>unsafe code on nilstriebs blog</title><link>http://nilstrieb.github.io/tags/unsafe-code/</link><description>Recent content in unsafe code on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="http://nilstrieb.github.io/tags/unsafe-code/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>http://nilstrieb.github.io/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>http://nilstrieb.github.io/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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! <?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>unsafe code on nilstriebs blog</title><link>/tags/unsafe-code/</link><description>Recent content in unsafe code on nilstriebs blog</description><generator>Hugo -- gohugo.io</generator><language>en-us</language><lastBuildDate>Fri, 22 Jul 2022 00:00:00 +0000</lastBuildDate><atom:link href="/tags/unsafe-code/index.xml" rel="self" type="application/rss+xml"/><item><title>Box Is a Unique Type</title><link>/posts/box-is-a-unique-type/</link><pubDate>Fri, 22 Jul 2022 00:00:00 +0000</pubDate><guid>/posts/box-is-a-unique-type/</guid><description>We have all used Box&amp;lt;T&amp;gt; before in our Rust code. It&amp;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!
struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;rsquo;s a glorious type, with great ergonomics struct Fields { a: String, b: String, } let fields = Box::new(Fields { a: &amp;#34;a&amp;#34;.to_string(), b: &amp;#34;b&amp;#34;.to_string() }); let a = fields.a; let b = fields.b; This kind of partial deref move is just one of the spectacular magic tricks box has up its sleeve, and they exist for good reason: They are very useful.</description><content>&lt;p>We have all used &lt;code>Box&amp;lt;T&amp;gt;&lt;/code> before in our Rust code. It&amp;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 and flexibitility. We can use it to put our values on the heap, but it can do even more
than that!&lt;/p> than that!&lt;/p>

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