talk about rust

Transcript

1. Rust Rust is a systems programming language focused on three goals: safety, speed, and concurrency. 1
2. Primitive Types • Booleans • char • Numeric types • Arrays • Slices • Tuples • str • Functions 2
3. Syntax let a = 1; //immutable let mut b = 2; //mutable fn foo(x :int) -> int { x } pub struct Vec<T> { buf: RawVec<T>, len: usize, } pub trait Debug { fn fmt(&self, &mut Formatter) -> Result<(), Error>; } impl<T: fmt::Debug> fmt::Debug for Vec<T> { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Debug::fmt(&**self, f) } } 3
4. Enum 4 enum Message { Quit, ChangeColor(i32, i32, i32), Move { x: i32, y: i32 }, Write(String), }
5. Option Rust's pointer types must always point to a valid location; there are no "null" pointers. Instead, Rust has optional pointers, like the optional owned box, Option<Box<T>>. let msg = Some("howdy"); // Take a reference to the contained string match msg { Some(ref m) => println!("{}", *m), None => (), } // Remove the contained string, destroying the Option let unwrapped_msg = match msg { Some(m) => m, None => "default message", };
6. Borrow pub trait Borrow<Borrowed> where Borrowed: ?Sized { fn borrow(&self) -> &Borrowed; } impl<T: ?Sized> borrow::Borrow<T> for Arc<T> { fn borrow(&self) -> &T { &**self } }