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borrow-checker.html
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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>Ownership and Borrowing</title>
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/clue.css">
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="lib/css/zenburn.css">
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</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<h1>Ownership and Borrowing</h1>
</section>
<section>
<section><h1>Introduction</h1></section>
<section>
<h2>Rust</h2>
<ul>
<li>Systems Programming language</li>
<li>
History
<ul>
<li>2010: Mozilla research project</li>
<li>May 2015: first stable version</li>
</ul>
</li>
</ul>
</section>
<section>
<h2>Goals</h2>
<ul>
<li>Safety</li>
<li>Speed</li>
<li>Concurrency</li>
</ul>
</section>
<section>
<h2>Applications</h2>
<ul>
<li>Rendering engines (Web, Video, Games...)</li>
<li>Embedded systems</li>
<li>Cryptography</li>
<li>Operating Systems</li>
<li>Parsers</li>
<li>Databases</li>
<li>Machine learning</li>
</ul>
</section>
<section>
<h2>Steep learning curve</h2>
What makes Rust so different?
</section>
</section>
<section>
<h1>Issues we're trying to tackle</h1>
</section>
<section>
<section>
<h2>Memory management</h2>
</section>
<section>
<h3>Manual memory management</h3>
<ul>
<li>Memory leaks</li>
<li>Use after free</li>
<li>Double free</li>
<li>Garbage collection/Stop the world</li>
</ul>
</section>
<section>
<h3>GC or ARC</h3>
<ul>
<li>Additional computation at runtime</li>
<li>Unpredictable resource consumption</li>
</ul>
</section>
</section>
<section>
<section>
<h2>Parallel computing</h2>
<ul>
<li>Concurrent access</li>
<li>Race conditions</li>
</ul>
</section>
<section>
<h3>Existing solutions</h3>
<ul>
<li>Purely functional programming (everything immutable)</li>
<li>Copy things all the time</li>
<li>Trust the developers to know what they're doing</li>
</ul>
</section>
</section>
<section>
<section>
<h1>Concepts</h1>
</section>
<section>
<h2>Ownership</h2>
<pre><code class="rust">
fn main() {
let v = vec![1, 2, 3];
}
</code></pre>
</section>
<section>
<h2>Move semantics</h2>
<pre><code class="rust">
fn main() {
let v = vec![1, 2, 3];
let v2 = v;
}
</code></pre>
</section>
<section>
<h2>Move semantics</h2>
<pre><code class="rust">
let v = vec![1, 2, 3];
let v2 = v;
println!("v[0] is: {}", v[0]);
</code></pre>
<pre><code>
error: use of moved value: `v`
println!("v[0] is: {}", v[0]);
^
</code></pre>
</section>
<section>
<h2>Move semantics</h2>
<pre><code class="rust">
fn take(v: Vec<i32>) {
// What happens here isn’t important.
}
let v = vec![1, 2, 3];
take(v);
println!("v[0] is: {}", v[0]);
</code></pre>
</section>
<section>
<h2>Reference and Borrowing</h2>
<pre><code class="rust">
fn foo(v1: &Vec<i32>, v2: &Vec<i32>) -> i32 {
// Do stuff with `v1` and `v2`.
// Return the answer.
42
}
let v1 = vec![1, 2, 3];
let v2 = vec![1, 2, 3];
let answer = foo(&v1, &v2);
// We can use `v1` and `v2` here!
</code></pre>
</section>
<section>
<h2>Mutable references</h2>
<pre><code class="rust">
let mut x = 5;
{
let y = &mut x;
*y += 1;
}
println!("{}", x);
</code></pre>
</section>
<section>
<h2>Rules</h2>
<ul>
<li>any borrow must last for a scope no greater than that of the owner</li>
<li>one or more references (<code>&T</code>) to a resource</li>
<li>exactly one mutable reference (<code>&mut T</code>)</li>
</ul>
</section>
<section>
<h2>Scopes</h2>
<pre><code class="rust">
fn main() {
let mut x = 5;
let y = &mut x;
*y += 1;
println!("{}", x);
}
</code></pre>
<code><pre>
error: cannot borrow `x` as immutable because it is also borrowed as mutable
println!("{}", x);
^
</pre></code>
</section>
<section>
<h2>Scopes</h2>
<pre><code class="rust">
fn main() {
let mut x = 5;
let y = &mut x; // -+ &mut borrow of `x` starts here.
// |
*y += 1; // |
// |
println!("{}", x); // -+ - Try to borrow `x` here.
} // -+ &mut borrow of `x` ends here.
</code></pre>
</section>
<section>
<h2>Scopes</h2>
<pre><code class="rust">
let mut x = 5;
{
let y = &mut x; // -+ &mut borrow starts here.
*y += 1; // |
} // -+ ... and ends here.
println!("{}", x); // <- Try to borrow `x` here.
</code></pre>
</section>
<!--<section>-->
<!--<h2>Lifetime/Scope</h2>-->
<!--</section>-->
</section>
<section>
<h1>Prevents</h1>
<ul>
<li>data races</li>
<li>iterator invalidation</li>
<li>use after free</li>
</ul>
</section>
<section>
<section>
<h1>Let's try it!</h1>
<a href="https://github.com/fbecart/borrow-checker-examples">github.com/fbecart/borrow-checker-examples</a>
</section>
</section>
<section>
<h1>The End</h1>
<h2>Thanks!</h2>
</section>
</div>
</div>
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