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.
In my case, all the types I wish to serialize implement the Display trait, and for serialization, I just want to use that trait.
How would I do that?
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) } But there's maybe a more straightforward way of doing this?
display_fromstr which uses the Display implementation for serialization and the FromStr implementation for deserialization.