Rust中的所有权，引用和借用

Posted 2022-08-16 aguncn

这个有意思，指针解释获新生！！！

fn main() 
    let mut s = String::from("hello");
    s.push_str(", world!");
    println!("", s);

    let s1 = String::from("hello");
    let (s2, len) = calculate_len(s1);
    println!("The len of ‘‘ is .", s2, len);

    let s1 = String::from("hello");
    let len = calculate_length(&s1);
    println!("The length of ‘‘ is .", s1, len);


fn calculate_len(s: String) -> (String, usize) 
    let length = s.len();
    (s, length)



fn calculate_length(s: &String) -> usize 
    s.len()