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< title > Por que você deveria aprender Rust< / title >
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< section >
< section data-background = "_images/rust-ferris.png" data-header >
< h1 class = "semi-opaque" > Por Que Rust< / h1 >
< / section >
< / section >
< section >
< section >
< p >
< a href = "https://insights.stackoverflow.com/survey/2019" > A languagem mais amada segundo o StackOverflow Survey< / a >
< p class = "fragment" > ... pelo 4⁰ ano seguido.< / p >
< / p >
< / section >
< / section >
< section >
< section >
< h2 > Imutabilidade por Default< / h2 >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
fn main() {
let a = 2;
a = 3;
println!("{}", a);
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs" data-trim >
3 | let a = 2;
| -
| |
| first assignment to `a`
| help: make this binding mutable: `mut a`
4 | a = 3;
| ^^^^^ cannot assign twice to immutable variable
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
fn main() {
let mut a = 2;
a = 3;
println!("{}", a);
}
< / code > < / pre >
< / section >
< / section >
< section >
< section >
< h2 > Borrow Checker< / h2 >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
a = String::from("hello");
< / code > < / pre >
< / section >
< section >
"Variável < code > a< / code > tem o valor < code > "hello"< / code > "
< / section >
< section >
< div >
"Posição de memória apontada por < code > a< / code > tem o valor < code > "hello"< / code > "
< / div >
< div class = "fragment" >
< pre > < code >
0x3f5cbf89 = "hello"
< / code > < / pre >
< / div >
< img src = "_images/rust-memory.png" alt = "" class = "fragment" >
< / section >
< section >
< div >
A language that doesn't affect the way you think
about programming, is not worth knowing.
< / div >
< div >
-- Alan Perlis, "ALGOL"
< / div >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
fn main() {
let a = String::from("hello");
let _b = a;
println!("{}", a)
}
< / code > < / pre >
< / section >
< section >
< pre > < code >
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
< / code > < / pre >
< / section >
< section >
< p > E se eu precisar acessar a variável em mais de um lugar?< / p >
< h3 class = "fragment" > References< / h3 >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
fn main() {
let a = String::from("hello");
let _b = &a;
println!("{}", a)
}
< / code > < / pre >
< / section >
< section >
< img src = "_images/rust-reference.png" alt = "" >
< / section >
< section >
< h3 > Regras do Borrow Checker< / h3 >
< ul >
< li class = "fragment" > Uma região de memória tem apenas um dono.< / li >
< li class = "fragment" > Uma região de memória pode ter inifitas referências
< span class = "fragment" >
desde que elas não durem mais do que o dono.
< / span >
< / li >
< li class = "fragment" >
É possível ter uma referência mutável de uma região de memória
< span class = "fragment" >
mas para haver uma referência mutável ela deve ser a < strong > única< / strong >
referência.
< / span >
< / li >
< / ul >
< / section >
< section >
< img src = "_images/dunno.jpg" alt = "" >
< / section >
< section >
< pre > < code class = "hljs go" data-trim > presente := Presente { ... }
canal < - presente< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs go" data-trim > presente := Presente { ... }
canal < - presente
presente.abrir()< / code > < / pre >
< / section >
< section >
< a href = "https://swift.org/blog/swift-5-exclusivity/" > Swift 5 Exclusivity Enforcement< / a >
< / section >
< / section >
< section >
< section >
< h2 > Tipos Algébricos< / h2 >
< p class = "fragment" > (structs)< / p >
< / section >
< section >
< h3 > enum< / h3 >
< pre > < code class = "hljs rust" data-trim >
enum IpAddr {
V4,
V6
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
enum IpAddr {
V4(String),
V6(String),
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
let home = IpAddr::V4(String::from("127.0.0.1");
match home {
V4(address) => println!("IPv4 addr: {}", address),
V6(address) => println!("Ipv6 addr: {}", address),
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
enum Option< T> {
Some(T),
None
}
< / code > < / pre >
< / section >
< / section >
< section >
< section >
< h2 > Error Control< / h2 >
< / section >
< section >
< pre > < code class = "hljs python" data-trim >
try:
something()
except Exception:
pass
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs java" data-trim >
try {
something();
} catch (Exception ex) {
System.out.println(ex);
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs c" data-trim >
FILE* f = fopen("someting.txt", "wb");
fprintf(f, "Done!");
fclose(f);
< / code > < / pre >
< / section >
< section >
< div >
Onde o erro foi tratado nisso?
< / div >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
enum Result< T, E> {
Ok(T),
Err(E),
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
File::create("something.txt") match {
Ok(fp) => fp.write_all(b"Hello world"),
Err(err) => println!("Failure! {}", err),
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
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),
}
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
let mut file = File::create("something.txt").unwrap();
file.write(b"Hello world").unwrap();
< / code > < / pre >
< / section >
< section >
< pre > < code class = "hljs rust" data-trim >
let mut file = File::create("something.txt")?;
file.write(b"Hello world")?;
OK(())
< / code > < / pre >
< / section >
< / section >
< section >
< section >
< h2 > Crazy stuff< / h2 >
< / section >
< section >
< a href = "https://medium.com/@shnatsel/how-rusts-standard-library-was-vulnerable-for-years-and-nobody-noticed-aebf0503c3d6" > How Rust’s standard library was vulnerable for years and nobody noticed< / a >
< / section >
< section >
< a href = "https://medium.com/@sgrif/no-the-problem-isnt-bad-coders-ed4347810270" > No, the problem isn’t “bad coders”< / a >
< / section >
< section >
< img src = "_images/rust-issues.png" alt = "4.5k issues no Github" class = "stretch" >
< / section >
< section >
< a href = "https://rustup.rs/" > rustup< / a >
< div class = "fragment" >
< small > stable-x86_64-pc-windows-msvc< / small >
< / div >
< div class = "fragment" >
< small > armv7-unknown-linux-gnueabihf< / small >
< / div >
< div class = "fragment" >
< small > wasm32-unknown-unknown< / small > < small class = "fragment" > (WebAssembly)< / small >
< / div >
< / section >
< / section >
< section >
< section >
< h2 > Bibliotecas< / h2 >
< / section >
< section >
< h3 > Rayon< / h3 >
< pre > < code >
fn sum_of_squares(input: & [i32]) -> i32 {
input.iter()
.map(|& i| i * i)
.sum()
}
< / code > < / pre >
< / section >
< section >
< h3 > Rayon< / h3 >
< pre > < code >
fn sum_of_squares(input: & [i32]) -> i32 {
input.par_iter()
.map(|& i| i * i)
.sum()
}
< / code > < / pre >
< / section >
< section >
< h3 > Log-Derive< / h3 >
< pre > < code >
#[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)
}
}
< / code > < / pre >
< / section >
< / section >
< section >
< section >
< h2 > E quem usa?< / h2 >
< / section >
< section >
< h3 > Magic Pocket< / h3 >
< p > Dropbox< / p >
< p > Petabyte storage< / p >
< / section >
< section >
< h3 > Servo< / h3 >
< p > Mozilla< / p >
< p > Base do Firefox Quantum< / p >
< / section >
< section >
< h3 > Azure< / h3 >
< p > Microsoft< / p >
< p > Usado na parte de IoT do Azure< / p >
< / section >
< section >
< h3 > Tor< / h3 >
< / section >
< / section >
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