Init

install¶

https://rust.godbolt.org/

yay -S rustup
rustup default stable

export RUSTUP_DIST_SERVER='https://mirrors.sjtug.sjtu.edu.cn/rust-static'
export RUSTUP_UPDATE_ROOT='https://mirrors.sjtug.sjtu.edu.cn/rust-static/rustup'
curl https://mirrors.ustc.edu.cn/rust-static/rustup/rustup-init.sh | sh

cargo:

#~/.cargo/config
[source.mirror]
registry = "https://mirrors.sjtug.sjtu.edu.cn/git/crates.io-index/"
[source.crates-io]
replace-with = "mirror"

其他问题查看这个

debug 输出¶

如果要使用println!("{}",a)这类的语法，必须要实现std::format:Display,debug 同理，但是使用#[derive(Debug)]就可以输出 struct。

#[derive(Debug)]
struct rect {
    w: u32,
    h: u32,
}
fn main() {
    let r1 = rect{w:12,h:21};
    println!("{:?}", r1);
}

trait、bounds、生命周期¶

T,E都是泛型，同时也实现了Display和Clone trait

fn some_funtion<T,E>(t:T,e:E)->i32
    where T:Display+Clone,
          E:Clone+Debug
{
}

生命周期也是泛型的一种：

fn longest_whith<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str
where
    T: Display,
{
    println!("Ahhhhhh!!{}", ann);
    if x.len() > y.len() {
        x
    } else {
        y
    }
}