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<span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><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>2022-07-23</span>
<span class=post-author>:: Nilstrieb</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>About better aliasing semantics for <code>Box&lt;T></code></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>© 2023 Powered by <a href=http://gohugo.io>Hugo</a></span>
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</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><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>2022-07-23
</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
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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="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2022-07-23 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>2022-07-23</span>
<span class=post-author>:: Nilstrieb</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="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="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2022-07-23 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>2022-07-23
</span><span class=post-author>:: Nilstrieb</span>
<span class=post-reading-time>:: 12 min read (2429 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 flexibility. We can use it to put our values on the heap, but it can do even more
@ -132,6 +133,5 @@ are very strong, and still giving code an option to obtain these seems useful. O
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><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 class=pagination><div class=pagination__title><span class=pagination__title-h></span><hr></div><div class=pagination__buttons><span class="button previous"><a href=/posts/item-patterns-and-struct-else/><span class=button__icon>←</span>
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<span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><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>2022-07-23</span>
<span class=post-author>:: Nilstrieb</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>About better aliasing semantics for <code>Box&lt;T></code></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>© 2023 Powered by <a href=http://gohugo.io>Hugo</a></span>
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</span><span class=post-author>:: Nilstrieb</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><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>2022-07-23
</span><span class=post-author>:: Nilstrieb</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>About better aliasing semantics for <code>Box&lt;T></code></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>© 2024 Powered by <a href=http://gohugo.io>Hugo</a></span>
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<!doctype html><html lang=en><head><title>Item Patterns And Struct Else :: nilstriebs blog</title><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Bringing more expressiveness to our items"><meta name=keywords content="design"><meta name=robots content="noodp"><link rel=canonical href=/posts/item-patterns-and-struct-else/><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="Item Patterns And Struct Else"><meta property="og:description" content="Bringing more expressiveness to our items"><meta property="og:url" content="/posts/item-patterns-and-struct-else/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2023-03-17 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/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17</span>
<span class=post-author>:: Nilstrieb</span>
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<meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Bringing more expressiveness to our items"><meta name=keywords content="design"><meta name=robots content="noodp"><link rel=canonical href=/posts/item-patterns-and-struct-else/><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="Item Patterns And Struct Else"><meta property="og:description" content="Bringing more expressiveness to our items"><meta property="og:url" content="/posts/item-patterns-and-struct-else/"><meta property="og:site_name" content="nilstriebs blog"><meta property="og:image" content="/img/favicon/orange.png"><meta property="og:image:width" content="2048"><meta property="og:image:height" content="1024"><meta property="article:published_time" content="2023-03-17 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/item-patterns-and-struct-else/>Item Patterns And Struct Else</a></h1><div class=post-meta><span class=post-date>2023-03-17
</span><span class=post-author>:: Nilstrieb</span>
<span class=post-reading-time>:: 7 min read (1351 words)</span></div><span class=post-tags>#<a href=/tags/rust/>rust</a>&nbsp;
#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content><div><h1 id=pattern-matching>Pattern matching<a href=#pattern-matching class=hanchor arialabel=Anchor>&#8983;</a></h1><p>One of my favourite features of Rust is pattern matching. It&rsquo;s a simple and elegant way to deal with not just structs, but also enums!</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>enum</span> <span style=color:#a6e22e>ItemKind</span> {
</span></span><span style=display:flex><span> Struct(String, Vec<span style=color:#f92672>&lt;</span>Field<span style=color:#f92672>&gt;</span>),
@ -126,6 +127,5 @@ So far we&rsquo;ve just used tuples. But we can go even further. Structs of stru
</span></span><span style=display:flex><span> compile_error!(<span style=color:#e6db74>&#34;didn&#39;t match pattern&#34;</span>);
</span></span><span style=display:flex><span>};
</span></span></code></pre></div><p>you&rsquo;re asking yourself what you just read. meanwhile, i am asking myself what i just wrote. we are very similar.</p></div></div><div class=pagination><div class=pagination__title><span class=pagination__title-h></span><hr></div><div class=pagination__buttons><span class="button next"><a href=/posts/box-is-a-unique-type/><span class=button__text>Box Is a Unique Type</span>
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#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><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>2022-07-23</span>
<span class=post-author>:: Nilstrieb</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>About better aliasing semantics for <code>Box&lt;T></code></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>© 2023 Powered by <a href=http://gohugo.io>Hugo</a></span>
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#<a href=/tags/language-design/>language-design</a>&nbsp;</span><div class=post-content>Bringing more expressiveness to our items</div><div><a class="read-more button" href=/posts/item-patterns-and-struct-else/>→</a></div></div><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>2022-07-23
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