Rust

Par Mathieu David / @azerupi

Un de plus...

Rust ...

• guarantit la sécurité de la mémoire
• empèche les data races
• offre une performance ...
• offre un accès de bas niveau ...

... comparable au C / C++

Exemple C++

	#include <iostream>
	#include <vector>

	int main() {
	    std::vector<int> v;
	    v.push_back(1);

	    int& elem = v[0];

	    for(int i=2; i<=100; i++)
	        v.push_back(i);

	    std::cout << elem << std::endl;

	    return 0;
	}
					

• Aliasing
• Mutation
• Aliasing + Mutation

Équivalent en Rust

fn main() {
    let mut v = Vec::new();
    v.push(1);

    let elem = &v[0];

    for i in 2..101 {
        v.push(i);
    }

    println!("{}", elem);
}
					

Ownership & Borrowing

fn exemple() {
	let mut s = String::from("Hello World!");

} // <-- s sort de sa portée, la mémoire est désallouée
						

Ownership & Borrowing

:9:9: 9:10 error: cannot borrow `v` as mutable because it is also borrowed as immutable [E0502]
:9         v.push(i);
           ^
:6:17: 6:18 note: previous borrow of `v` occurs here; the immutable borrow prevents subsequent moves or mutable borrows of `v` until the borrow ends
:6     let elem = &v[0];
                  ^
:13:2: 13:2 note: previous borrow ends here
:2 fn main() {
...
:13 }
    ^
error: aborting due to previous error