0047-Bytes-BytesMut使用

环境

• Time 2022-05-29
• Rust 1.61.0
• Bytes 1.1.0

前言

说明

参考：https://docs.rs/bytes/latest/bytes/struct.BytesMut.html

目标

使用 BytesMut 的方法。

with_capacity

fn main() {
    let bytes = BytesMut::with_capacity(44);
    println!("{:?}",bytes);
}

new

fn main() {
    let bytes = BytesMut::new();
    println!("{:?}", bytes);
}

capacity

fn main() {
    let bytes = BytesMut::with_capacity(44);
    println!("{:?}", bytes.capacity());
}

len

fn main() {
    let bytes = BytesMut::from("JiangBo");
    println!("{:?}", bytes.len());
}

put

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    bytes.put(b"!".as_ref());
    println!("{:?}", bytes);
}

freeze

fn main() {
    let bytes = BytesMut::from("JiangBo");
    println!("{:?}", bytes.freeze());
}

split_off

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    println!("{:?}", bytes.split_off(5));
}

split_to

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    println!("{:?}", bytes.split_to(5));
}

split

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    println!("{:?}", bytes.split());
}

extend_from_slice

fn main() {
    let mut bytes = BytesMut::from("Hello ");
    bytes.extend_from_slice("JiangBo".as_ref());
    println!("{:?}", bytes);
}

reverse

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    bytes.reverse();
    println!("{:?}", bytes);
}

clear

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    bytes.clear();
    println!("{:?}", bytes);
}

resize

fn main() {
    let mut bytes = BytesMut::from("JiangBo");
    bytes.resize(10, b'o');
    println!("{:?}", bytes);
}

总结

使用了 BytesMut 中定义的一些方法。

附录