roneygomes

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roneygomes

[alias]
        pr = pull --rebase
        ls = log --graph --pretty=format:"%C(yellow)%h%Cred%d\\ %Creset%s%Cgreen\\ [%cn]" --decorate --abbrev-commit
        ll = log --pretty=format:"%C(yellow)%h%Cred%d\\ %Creset%s%Cgreen\\ [%cn]" --decorate --numstat
        lnc = log --pretty=format:"%h\\ %s\\ [%cn]"
        lds = log --pretty=format:"%C(yellow)%h\\ %ad%Cred%d\\ %Creset%s%Cgreen\\ [%cn]" --decorate --date=short
	clean-branches = !git branch | grep -v \" master$\"  | xargs git branch -D
        checkpoint = commit -am 'checkpoint'
        last-message = log -n 1 --pretty=format:'%n%n%b'

roneygomes

let _ = media.write(text_bytes);

// ...

roneygomes

let mut array_wrapper = ArrayWrapper {
    buffer: vec![]
};

let media: &mut dyn Write = &mut array_wrapper;

write(media, "alô mundo!");

roneygomes

Compiling playground v0.0.1 (/playground)
    Finished dev [unoptimized + debuginfo] target(s) in 1.21s
     Running `target/debug/playground`

ArrayWrapper { buffer: [97, 108, 195, 180, 32, 109, 117, 110, 100, 111, 33] }

roneygomes

fn write(media: &mut dyn Write, text: &str) {
    // ...
}

roneygomes

Compiling playground v0.0.1 (/playground)
error[E0782]: trait objects must include the `dyn` keyword
  --> src/main.rs:22:22
   |
22 | fn write(media: &mut Write, text: &str) {
   |                      ^^^^^
   |
help: add `dyn` keyword before this trait
   |
22 | fn write(media: &mut dyn Write, text: &str) {

roneygomes

use std::io::Write;
use std::io::Result;

#[derive(Debug)]
struct ArrayWrapper {
    pub buffer: Vec<u8>,
}

impl Write for ArrayWrapper {
    fn write(&mut self, buf: &[u8]) -> Result<usize> {

roneygomes

use std::io::Write;
use std::io::Result;

#[derive(Debug)]
struct ArrayWrapper {
    pub buffer: Vec<u8>,
}

impl Write for ArrayWrapper {
    fn write(&mut self, buf: &[u8]) -> Result<usize> {

roneygomes

pub trait Write {
    // escreve um buffer nesse escritor retornando
    // quantos bytes foram escritos em caso de sucesso
    fn write(&mut self, buf: &[u8]) -> Result<usize>;

    // limpa o escritor, garantindo que qualquer conteúdo
    // armazenado em buffers intermediários seja persistido
    // no armazenamento final
    fn flush(&mut self) -> Result<()>;