duyet/serde-trait-object-examples

Example of deserializable trait objects.

Example of deserializable trait objects. It is using typetag for painless serialization of &dyn Trait trait objects and serialization + deserialization of Box<dyn Trait> trait objects.

use serde::{Deserialize, Serialize};

#[typetag::serde(tag = "name")]
trait Transformer {
    fn transform(&self);
}

#[derive(Serialize, Deserialize)]
struct UpperCase;

#[typetag::serde(name = "uppercase")]
impl Transformer for UpperCase {
    fn transform(&self) {
        println!("uppercase");
    }
}

...

fn main() {
    let yaml = "
        - name: uppercase
        - name: my_custom
          x: 1
          y: 2
    ";

    let values: Vec<Box<dyn Transformer>> = serde_yaml::from_str(yaml).unwrap();

    for value in values {
        value.transform();
    }
}

$ cargo run
uppercase
my_custom: x=1 y=2