rust - 临时u8切片的Rust字符串

Question

我想运行一个命令并捕获其输出。

let result = match Command::new(thing.command).output() {
            Ok(out) => String::from_utf8_lossy(&out.stdout),
            Err(_) => ....,
        };

我收到 &out.stdout的 borrowed value does not live long enough错误。我理解这个问题，但是如何创建u8 slice的副本并将完整所有权转移到新创建的字符串中？

Answer 1

from_utf8_lossy的返回值是Cow:pub fn from_utf8_lossy(v: &[u8]) -> Cow<'_, str>如果要创建副本并转让所有权，into_owned()的Cow是专门为此设计的:

pub fn into_owned(self) -> <B as ToOwned>::Owned
Extracts the owned data.

Clones the data if it is not already owned.