如何使用现有的Display trait实施来实现序列化? [英] How can I implement Serialize using an existing Display trait implementation?

问题描述

我希望在外部包装箱中的类型上实现Serialize特质，但这是禁止的.我看了serde的远程派生，但是似乎很多工作都在重写类型.

I wish to implement the Serialize trait on a type in an extern crate, but it's forbidden. I had a look at serde's remote derive, but it seems a lot of work rewriting the types.

对于我来说，我希望序列化的所有类型都实现Display特征，而对于序列化，我只想使用该特征.

In my case, all the types I wish to serialize implement the Display trait, and for serialization, I just want to use that trait.

我该怎么做?

推荐答案

这是我的尝试(注意:我是OP):

Here's my try (note: I'm the OP):

use serde::{Serialize, Serializer};
use std::io::Error;
use std::fmt::Display;

#[derive(Debug, Serialize)]
pub enum MyError {
    Custom,
    #[serde(serialize_with = "use_display")]
    Io(Error)
}

fn use_display<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
where
    T: Display,
    S: Serializer
{
    serializer.collect_str(value)
}

游乐场

但是也许有更简单的方法可以做到这一点?

But there's maybe a more straightforward way of doing this?

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