Function tao_of_rust::ch06::functions::mut_params

pub fn mut_params()

函数：参数传递

Base usage: 可变参数按值传递

fn modify(mut v: Vec<u32>) -> Vec<u32> {
    v.push(42);
    v
}
fn main(){
    let v = vec![1,2,3];
    let v = modify(v);
    println!("{:?}", v);
}

Base usage: 可变参数传递按引用传递

fn modify(v: &mut [u32])  {
    v.reverse();
}
fn main(){
    let mut v = vec![1,2,3];
    modify(&mut v);
    println!("{:?}", v); // [3, 2, 1]
}