\u6240\u6709\u6743\u7cfb\u7edf

Rust \u7684\u6838\u5fc3\u7279\u6027\u4e4b\u4e00\u5c31\u662f\u6240\u6709\u6743\u7cfb\u7edf\u3002

\u89c4\u5219

1. Rust \u4e2d\u6bcf\u4e2a\u503c\u90fd\u6709\u4e00\u4e2a\u6240\u6709\u8005 (owner)
2. \u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u4e2a\u6240\u6709\u8005
3. \u5f53\u6240\u6709\u8005\u79bb\u5f00\u4f5c\u7528\u57df\u65f6\uff0c\u503c\u88ab\u4e22\u5f03

fn main() {
    let s1 = String::from("hello");
    let s2 = s1; // s1 \u7684\u6240\u6709\u6743\u8f6c\u79fb\u7ed9 s2

    // println!("{}", s1); // \u7f16\u8bd1\u9519\u8bef\uff01s1 \u5df2\u4e0d\u53ef\u7528
    println!("{}", s2); // OK
}

\u501f\u7528\u4e0e\u5f15\u7528

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

fn main() {
    let s1 = String::from("hello");
    let len = calculate_length(&s1);
    println!("'{}' \u7684\u957f\u5ea6\u662f {}", s1, len);
}

$$\text{Borrow}\ne \text{Move}$$