如何在不引起内存泄漏的情况下从 serde_json::from_slice 修复 "borrowed value does not live long enough"？

Question

考虑以下代码：

pub async fn parse_bytes<'a, R: Deserialize<'a>>(_query: serde_json::Value) -> R {
    let result: Vec<u8> = vec![]; // fetch_result(&query).await

    serde_json::from_slice::<R>(result.as_slice())
        .expect("Can't parse bytes response")
}

错误

无法编译：

`result` does not live long enough
borrowed value does not live long enough

暂定方案

提供 result.leak() 反而可行，但我不确定这是正确的解决方案：该方法的文档叙述：

This function is mainly useful for data that lives for the remainder of the program's life. Dropping the returned reference will cause a memory leak

一旦函数结束，返回的引用就会被丢弃。

问题

如何在不引起内存泄漏的情况下解决上述问题？

Answer 1

改用DeserializeOwned。

use serde::de::DeserializeOwned;

pub async fn parse_bytes<R: DeserializeOwned>(_query: serde_json::Value) -> R {
    let result: Vec<u8> = vec![]; // fetch_result(&query).await

    serde_json::from_slice::<R>(result.as_slice())
        .expect("Can't parse bytes response")
}