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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>Rust Intro</title>
<link rel="stylesheet" href="css/reveal.css">
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<body>
<div class="reveal">
<div class="slides">
<section>
<img style="border: 0px; box-shadow: none; width: 50vw;" src="rust-game-logo.svg">
</section>
<section>
<img style="border: 0px; box-shadow: none; width: 15vw;" src="rust-lang-logo.svg">
<h1>Rust Intro</h1>
<h3>Safe, concurrent, fast</h3>
<p>
<small>DWW 2017-02-13</small>
</p>
</section>
<section>
<h2>In a nutshell</h2>
<ul>
<li class="fragment">"Systemprogrammiersprache"</li>
<li class="fragment">Sicherheit</li>
<li class="fragment">Nebenläufig</li>
<li class="fragment">Performant</li>
<li class="fragment">Gesponsort durch Mozilla Research</li>
<li class="fragment">Stable seit Mai 2015</li>
<li class="fragment">Apache 2.0/MIT Lizenz</li>
</ul>
</section>
<section>
<h2>Warnhinweis</h2>
<ul>
<li class="fragment">IDE-Support</li>
<li class="fragment">Bibliotheken</li>
<li class="fragment">Lernkurve</li>
</ul>
</section>
<section>
<h2>"Fehlende" "Features"</h2>
<ul>
<li class="fragment">Garbage Collection</li>
<li class="fragment">Exceptions</li>
<li class="fragment">Vererbung</li>
<li class="fragment">Data races</li>
<li class="fragment">ConcurrentModificationExceptions</li>
<li class="fragment">NullPointerExceptions</li>
<li class="fragment">Buffer overruns</li>
</ul>
</section>
<section>
<h2>Hello World</h2>
<pre><code class="hljs" data-trim contenteditable>
fn main() {
println!("Hello World!");
}
</code></pre>
</section>
<section>
<h2>Macros</h2>
<pre><code class="hljs" data-trim contenteditable>
info!("Commencing yak shaving for {:?}", yak);
let re = regex!(r"\d{4}-\d{2}-\d{2}");
</code></pre>
</section>
<section>
<h2>Error handling 1</h2>
<pre><code class="hljs" data-trim contenteditable>
remove_file("/file");
</code></pre>
<pre><code class="hljs" data-trim contenteditable>
warning: unused result which must be used, #[warn(unused_must_use)] on by default
--> error.rs:7:5
|
7 | remove_file("/file");
| ^^^^^^^^^^^^^^^^^^^^^
</code></pre>
</section>
<section>
<h2>Error handling 2</h2>
<pre><code class="hljs" data-trim contenteditable>
if remove_file("/file").is_err() {
panic!("Could not delete file");
} </code></pre>
</section>
<section>
<h2>Error handling 3</h2>
<pre><code class="hljs" data-trim contenteditable>
match remove_file("/file") {
Ok(_) => {},
Err(err) => return Err(err),
} </code></pre>
</section>
<section>
<h2>Error handling 4</h2>
<pre><code class="hljs" data-trim contenteditable>
try!(remove_file("/file"));</code></pre>
</section>
<section>
<h2>Error handling 5</h2>
<pre><code class="hljs" data-trim contenteditable>
remove_file("/file")?;</code></pre>
</section>
<section>
<h2>Data safety 1</h2>
<p>Problem: <span class="fragment">Shared</span> <span class="fragment">Mutable Access</span> </p>
<p class="fragment">Lösung: Verfolgen von Änderbarkeit und Sharing auf Typebene<p>
</section>
<section>
<h2>Data safety 2</h2>
<p>Regeln:</p>
<ul>
<li class="fragment">Jede Instanz hat genau einen Owner</li>
<li class="fragment">Diese kann entweder genau einmal mutable verliehen werden</li>
<li class="fragment">XOR beliebig oft immutable verliehen werden</li>
</ul>
</section>
<section>
<h2>Data safety 3</h2>
<code class="hljs fragment" data-trim contenteditable>let foo1 = vec![1, 2, 3]; // Nicht veränderbar</code>
<code class="hljs fragment" data-trim contenteditable>let mut foo2 = vec![1, 2, 3]; // Veränderbar</code>
<code class="hljs fragment" data-trim contenteditable>let foo3 = &mut foo2; // Veränderbare Referenz</code>
<code class="hljs fragment" data-trim contenteditable>let foo4 = &foo2; // Nicht-veränderbare Referenz</code>
<pre style="width: 100%"><code class="hljs fragment" data-trim contenteditable>
error[E0502]: cannot borrow `foo2` as immutable because it is also borrowed as mutable
--> error.rs:6:17
|
5 | let foo3 = &mut foo2;
| ---- mutable borrow occurs here
6 | let foo4 = &foo2;
| ^^^^ immutable borrow occurs here
7 | }
| - mutable borrow ends here
</code></pre>
</section>
<section>
<h2>Traits 1</h2>
<ul>
<li class="fragment">"Interfaces"</li>
<li class="fragment">...die auch für fremde Klassen implementiert werden können</li>
<li class="fragment">+ Static dispatch/Inlining</li>
</ul>
</section>
<section>
<h2>Traits 2</h2>
<pre style="width: 100%"><code class="hljs" data-trim contenteditable>
#[derive(Debug)]
struct Period {seconds: u64}
trait ToPeriod {
fn minutes(self) -> Period;
}
impl ToPeriod for u64 {
fn minutes(self) -> Period {
Period {seconds: self * 60}
}
}
fn main() {
let three_minutes = 3.minutes();
println!("{:?}", three_minutes);
// Period { seconds: 180 }
}
</code></pre>
</section>
<section>
<h2>trait <code>Drop</code></h2>
<ul>
<li class="fragment">"finalize()"</li>
<li class="fragment">Wird aufgerufen, wenn eine Instanz nicht mehr geowned ist</li>
<li class="fragment">
<pre style="width: 100%"><code class="hljs" data-trim contenteditable
>{
let mut f = File::create("foo.txt")?;
f.write_all(b"Hello, world!")?;
// foo.txt wird hier in jedem Fall geschlossen
}
</code></pre>
</li>
<li class="fragment">Verhindert Resourcenleaks</li>
</ul>
</section>
<section>
<h2>Weitere Features</h2>
<ul>
<li class="fragment">Echte Generics (mit monomorphization)</li>
<li class="fragment">Safe Concurrency: Send & Sync traits</li>
<li class="fragment">Zero cost abstractions, z.B.: Option<T></li>
<li class="fragment">Sum type enums/Tagged Unions</li>
<li class="fragment">C interop</li>
</ul>
</section>
<section>
<blockquote>
<p>
“ A language that doesn't affect the way you think about programming, is not worth knowing.”
</p>
<footer>— Alan Perlis</footer>
</blockquote>
</section>
</div>
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