+
+
+
+
+
+
+
+
+
+
+
+
+
+ "Variável
+
+
+
+
+
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+
+
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+
+
+
+
+
+
+
+
+ Swift 5 Exclusivity Enforcement
+
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+
+
+
+
+
+
+
+
+ How Rust’s standard library was vulnerable for years and nobody noticed
+
+
+
+ No, the problem isn’t “bad coders”
+
+
+
+ 
+
+
+
+ rustup
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
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+
+
+
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+
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+
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+
+
+
+
+
+
+
+
+
+
+
+ O Que Rust Tem de Legal
+Borrow Checker
+
+a = 2
+ a tem o valor 2"
+
+ "Posição de memória apontada por
+
+ a tem o valor 2"
+
+
+
+0x3f5cbf89 = 2
+
+ A language that doesn't affect the way you think
+ about programming, is not worth knowing.
+
+
+
+ -- Alan Perlis, "ALGOL"
+
+
+fn main() {
+ let a = String::from("hello");
+ let _b = a;
+ println!("{}", a)
+}
+
+error[E0382]: borrow of moved value: `a`
+ --> src/main.rs:5:20
+ |
+4 | let _b = a;
+ | - value moved here
+5 | println!("{}", a)
+ | ^ value borrowed here after move
+ |
+ = note: move occurs because `a` has type `std::string::String`, which does not implement the `Copy` trait
+
+fn main() {
+ let a = 2;
+ let b = a;
+ println!("{}", a);
+ println!("{}", b);
+}
+
+2
+2
+ "Copy trait"
+Imutabilidade por Default
+
+fn main() {
+ let a = 2;
+ a = 3;
+ println!("{}", a);
+}
+
+3 | let a = 2;
+ | -
+ | |
+ | first assignment to `a`
+ | help: make this binding mutable: `mut a`
+4 | a = 3;
+ | ^^^^^ cannot assign twice to immutable variable
+
+fn main() {
+ let mut a = 2;
+ a = 3;
+ println!("{}", a);
+}
+ Enums
+
+enum IpAddr {
+ V4,
+ V6
+}
+
+enum IpAddr {
+ V4(String),
+ V6(String),
+}
+
+let home = IpAddr::V4(String::from("127.0.0.1");
+
+match home {
+ V4(address) => println!("IPv4 addr: {}", address),
+ V6(address) => println!("Ipv6 addr: {}", address),
+}
+
+enum Option<T> {
+ Some(T),
+ None
+}
+ Error Control
+
+try:
+ something()
+except Exception:
+ pass
+
+try {
+ something();
+} catch (Exception ex) {
+ System.out.println(ex);
+}
+
+FILE* f = fopen("someting.txt", "wb");
+fprintf(f, "Done!");
+fclose(f);
+
+ Onde o erro foi tratado nisso?
+
+
+enum Result<T, E> {
+ Ok(T),
+ Err(E),
+}
+
+File::create("something.txt") match {
+ Ok(fp) => fp.write_all(b"Hello world"),
+ Err(err) => println!("Failure! {}", err),
+}
+
+File::create("something.txt") match {
+ Ok(fp) => fp.write_all(b"Hello world") match {
+ Ok(_) => (),
+ Err(err) => println!("Can't write! {}", err),
+ }
+ Err(err) => println!("Failure! {}", err),
+}
+
+let mut file = File::create("something.txt).unwrap();
+file.write(b"Hello world").unwrap();
+
+let mut file = File::create("something.txt)?;
+file.write(b"Hello world")?;
+OK(())
+ Crazy stuff
+
+
+ stable-x86_64-pc-windows-msvc
+
+
+
+ armv7-unknown-linux-gnueabihf
+
+
+
+ wasm32-unknown-unknown (WebAssembly)
+
+ Bibliotecas
+Rayon
+ +
+fn sum_of_squares(input: &[i32]) -> i32 {
+ input.iter()
+ .map(|&i| i * i)
+ .sum()
+}
+ Rayon
+ +
+fn sum_of_squares(input: &[i32]) -> i32 {
+ input.par_iter()
+ .map(|&i| i * i)
+ .sum()
+}
+ Log-Derive
+ +
+#[logfn(ok = "TRACE", err = "ERROR")]
+fn call_isan(num: &str) -> Result<Success, Error> {
+ if num.len() >= 10 && num.len() <= 15 {
+ Ok(Success)
+ } else {
+ Err(Error)
+ }
+}
+ E quem usa?
+Magic Pocket
+ +Dropbox
+ +Petabyte storage
+Servo
+ +Mozilla
+ +Base do Firefox Quantum
+Azure
+ +Microsoft
+ +Usado na parte de IoT do Azure
+